Implement tokenization in a C extension.

.github/probots.yml

@@ -1,2 +0,0 @@
-enabled:
-  - cla

.gitignore

@@ -6,5 +6,7 @@ pkg
 .rvmrc
 .ruby-version
 Gemfile.lock
-.bundle
+/ext/liquid/Makefile
-.byebug_history
+*.o
+*.bundle
+/tmp

.rubocop.yml

@@ -1,17 +0,0 @@
-inherit_from:
-  - 'https://shopify.github.io/ruby-style-guide/rubocop.yml'
-  - .rubocop_todo.yml
-
-require: rubocop-performance
-
-Performance:
-  Enabled: true
-
-AllCops:
-  TargetRubyVersion: 2.4
-  Exclude:
-    - 'vendor/bundle/**/*'
-
-Naming/MethodName:
-  Exclude:
-    - 'example/server/liquid_servlet.rb'

.rubocop_todo.yml

@@ -1,48 +0,0 @@
-# This configuration was generated by
-# `rubocop --auto-gen-config`
-# on 2019-09-11 06:34:25 +1000 using RuboCop version 0.74.0.
-# The point is for the user to remove these configuration records
-# one by one as the offenses are removed from the code base.
-# Note that changes in the inspected code, or installation of new
-# versions of RuboCop, may require this file to be generated again.
-
-# Offense count: 2
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: runtime_error, standard_error
-Lint/InheritException:
-  Exclude:
-    - 'lib/liquid/interrupts.rb'
-
-# Offense count: 98
-# Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
-# URISchemes: http, https
-Metrics/LineLength:
-  Max: 294
-
-# Offense count: 44
-Naming/ConstantName:
-  Exclude:
-    - 'lib/liquid.rb'
-    - 'lib/liquid/block_body.rb'
-    - 'lib/liquid/tags/assign.rb'
-    - 'lib/liquid/tags/capture.rb'
-    - 'lib/liquid/tags/case.rb'
-    - 'lib/liquid/tags/cycle.rb'
-    - 'lib/liquid/tags/for.rb'
-    - 'lib/liquid/tags/if.rb'
-    - 'lib/liquid/tags/include.rb'
-    - 'lib/liquid/tags/raw.rb'
-    - 'lib/liquid/tags/table_row.rb'
-    - 'lib/liquid/variable.rb'
-    - 'performance/shopify/comment_form.rb'
-    - 'performance/shopify/paginate.rb'
-    - 'test/integration/tags/include_tag_test.rb'
-
-# Offense count: 5
-Style/ClassVars:
-  Exclude:
-    - 'lib/liquid/condition.rb'
-    - 'lib/liquid/strainer.rb'
-    - 'lib/liquid/template.rb'

.travis.yml

@@ -1,26 +1,16 @@
-language: ruby
-cache: bundler
-
 rvm:
-  - 2.4
+  - 1.9.3
-  - 2.5
+  - 2.0.0
-  - &latest_ruby 2.6
+  - 2.1.0
-  - 2.7
+  - jruby-19mode
-  - ruby-head
+  - jruby-head
-
+  - rbx-19mode
 matrix:
-  include:
-    - rvm: *latest_ruby
-      script: bundle exec rake memory_profile:run
-      name: Profiling Memory Usage
   allow_failures:
-    - rvm: ruby-head
+    - rvm: rbx-19mode
+    - rvm: jruby-head
 
-branches:
+script: "rake test"
-  only:
-    - master
-    - gh-pages
-    - /.*-stable/
 
 notifications:
   disable: true

CONTRIBUTING.md

@@ -4,22 +4,23 @@
 
 * Bugfixes
 * Performance improvements
-* Features that are likely to be useful to the majority of Liquid users
+* Features which are likely to be useful to the majority of Liquid users
 
 ## Things we won't merge
 
-* Code that introduces considerable performance degrations
+* Code which introduces considerable performance degrations
-* Code that touches performance-critical parts of Liquid and comes without benchmarks
+* Code which touches performance critical parts of Liquid and comes without benchmarks
-* Features that are not important for most people (we want to keep the core Liquid code small and tidy)
+* Features which are not important for most people (we want to keep the core Liquid code small and tidy)
-* Features that can easily be implemented on top of Liquid (for example as a custom filter or custom filesystem)
+* Features which can easily be implemented on top of Liquid (for example as a custom filter or custom filesystem)
-* Code that does not include tests
+* Code which comes without tests
-* Code that breaks existing tests
+* Code which breaks existing tests
 
 ## Workflow
 
 * Fork the Liquid repository
 * Create a new branch in your fork
-* If it makes sense, add tests for your code and/or run a performance benchmark
+* If it makes sense, add tests for your code and run a performance benchmark
-* Make sure all tests pass (`bundle exec rake`)
+* Make sure all tests pass
 * Create a pull request
+* In the description, ping one of [@boourns](https://github.com/boourns), [@fw42](https://github.com/fw42), [@camilo](https://github.com/camilo), [@dylanahsmith](https://github.com/dylanahsmith), or [@arthurnn](https://github.com/arthurnn) and ask for a code review.
 

Gemfile

@@ -1,27 +1,3 @@
-# frozen_string_literal: true
-
 source 'https://rubygems.org'
-git_source(:github) do |repo_name|
-  "https://github.com/#{repo_name}.git"
-end
 
 gemspec
-
-group :benchmark, :test do
-  gem 'benchmark-ips'
-  gem 'memory_profiler'
-  gem 'terminal-table'
-
-  install_if -> { RUBY_PLATFORM !~ /mingw|mswin|java/ && RUBY_ENGINE != 'truffleruby' } do
-    gem 'stackprof'
-  end
-end
-
-group :test do
-  gem 'rubocop', '~> 0.74.0', require: false
-  gem 'rubocop-performance', require: false
-
-  platform :mri, :truffleruby do
-    gem 'liquid-c', github: 'Shopify/liquid-c', ref: 'master'
-  end
-end

History.md

@@ -1,208 +1,62 @@
-# Liquid Change Log
+# Liquid Version History
 
-## 4.0.3 / 2019-03-12
+## 3.0.0 / not yet released / branch "master"
 
-### Fixed
+* ...
-* Fix break and continue tags inside included templates in loops (#1072) [Justin Li]
+* Freeze lots of string literals for new Ruby 2.1 optimization, see #297 [Florian Weingarten, fw42]
+* Allow newlines in tags and variables, see #324 [Dylan Thacker-Smith, dylanahsmith]
+* Tag#parse is called after initialize, which now takes options instead of tokens as the 3rd argument. See #321 [Dylan Thacker-Smith, dylanahsmith]
+* Raise `Liquid::ArgumentError` instead of `::ArgumentError` when filter has wrong number of arguments #309 [Bogdan Gusiev, bogdan]
+* Add a to_s default for liquid drops, see #306 [Adam Doeler, releod]
+* Add strip, lstrip, and rstrip to standard filters [Florian Weingarten, fw42]
+* Make if, for & case tags return complete and consistent nodelists, see #250 [Nick Jones, dntj]
+* Prevent arbitrary method invocation on condition objects, see #274 [Dylan Thacker-Smith, dylanahsmith]
+* Don't call to_sym when creating conditions for security reasons, see #273 [Bouke van der Bijl, bouk]
+* Fix resource counting bug with respond_to?(:length), see #263 [Florian Weingarten, fw42]
+* Allow specifying custom patterns for template filenames, see #284 [Andrei Gladkyi, agladkyi]
+* Allow drops to optimize loading a slice of elements, see #282 [Tom Burns, boourns]
+* Support for passing variables to snippets in subdirs, see #271 [Joost Hietbrink, joost]
+* Add a class cache to avoid runtime extend calls, see #249 [James Tucker, raggi]
+* Remove some legacy Ruby 1.8 compatibility code, see #276 [Florian Weingarten, fw42]
+* Add default filter to standard filters, see #267 [Derrick Reimer, djreimer]
+* Add optional strict parsing and warn parsing, see #235 [Tristan Hume, trishume]
+* Add I18n syntax error translation, see #241 [Simon Hørup Eskildsen, Sirupsen]
+* Make sort filter work on enumerable drops, see #239 [Florian Weingarten, fw42]
+* Fix clashing method names in enumerable drops, see #238 [Florian Weingarten, fw42]
+* Make map filter work on enumerable drops, see #233 [Florian Weingarten, fw42]
+* Improved whitespace stripping for blank blocks, related to #216 [Florian Weingarten, fw42]
 
-## 4.0.2 / 2019-03-08
+## 2.6.0 / 2013-11-25 / branch "2.6-stable"
-
-### Changed
-* Add `where` filter (#1026) [Samuel Doiron]
-* Add `ParseTreeVisitor` to iterate the Liquid AST (#1025) [Stephen Paul Weber]
-* Improve `strip_html` performance (#1032) [printercu]
-
-### Fixed
-* Add error checking for invalid combinations of inputs to sort, sort_natural, where, uniq, map, compact filters (#1059) [Garland Zhang]
-* Validate the character encoding in url_decode (#1070) [Clayton Smith]
-
-## 4.0.1 / 2018-10-09
-
-### Changed
-* Add benchmark group in Gemfile (#855) [Jerry Liu]
-* Allow benchmarks to benchmark render by itself (#851) [Jerry Liu]
-* Avoid calling `line_number` on String node when rescuing a render error. (#860) [Dylan Thacker-Smith]
-* Avoid duck typing to detect whether to call render on a node. [Dylan Thacker-Smith]
-* Clarify spelling of `reversed` on `for` block tag (#843) [Mark Crossfield]
-* Replace recursion with loop to avoid potential stack overflow from malicious input (#891, #892) [Dylan Thacker-Smith]
-* Limit block tag nesting to 100 (#894) [Dylan Thacker-Smith]
-* Replace `assert_equal nil` with `assert_nil` (#895) [Dylan Thacker-Smith]
-* Remove Spy Gem (#896) [Dylan Thacker-Smith]
-* Add `collection_name` and `variable_name` reader to `For` block (#909)
-* Symbols render as strings (#920) [Justin Li]
-* Remove default value from Hash objects (#932) [Maxime Bedard]
-* Remove one level of nesting (#944) [Dylan Thacker-Smith]
-* Update Rubocop version (#952) [Justin Li]
-* Add `at_least` and `at_most` filters (#954, #958) [Nithin Bekal]
-* Add a regression test for a liquid-c trim mode bug (#972) [Dylan Thacker-Smith]
-* Use https rather than git protocol to fetch liquid-c [Dylan Thacker-Smith]
-* Add tests against Ruby 2.4 (#963) and 2.5 (#981)
-* Replace RegExp literals with constants (#988) [Ashwin Maroli]
-* Replace unnecessary `#each_with_index` with `#each` (#992) [Ashwin Maroli]
-* Improve the unexpected end delimiter message for block tags. (#1003) [Dylan Thacker-Smith]
-* Refactor and optimize rendering (#1005) [Christopher Aue]
-* Add installation instruction (#1006) [Ben Gift]
-* Remove Circle CI (#1010)
-* Rename deprecated `BigDecimal.new` to `BigDecimal` (#1024) [Koichi ITO]
-* Rename deprecated Rubocop name (#1027) [Justin Li]
-
-### Fixed
-* Handle `join` filter on non String joiners (#857) [Richard Monette]
-* Fix duplicate inclusion condition logic error of `Liquid::Strainer.add_filter` method (#861)
-* Fix `escape`, `url_encode`, `url_decode` not handling non-string values (#898) [Thierry Joyal]
-* Fix raise when variable is defined but nil when using `strict_variables` [Pascal Betz]
-* Fix `sort` and `sort_natural` to handle arrays with nils (#930) [Eric Chan]
-
-## 4.0.0 / 2016-12-14 / branch "4-0-stable"
-
-### Changed
-* Render an opaque internal error by default for non-Liquid::Error (#835) [Dylan Thacker-Smith]
-* Ruby 2.0 support dropped (#832) [Dylan Thacker-Smith]
-* Add to_number Drop method to allow custom drops to work with number filters (#731)
-* Add strict_variables and strict_filters options to detect undefined references (#691)
-* Improve loop performance (#681) [Florian Weingarten]
-* Rename Drop method `before_method` to `liquid_method_missing` (#661) [Thierry Joyal]
-* Add url_decode filter to invert url_encode (#645) [Larry Archer]
-* Add global_filter to apply a filter to all output (#610) [Loren Hale]
-* Add compact filter (#600) [Carson Reinke]
-* Rename deprecated "has_key?" and "has_interrupt?" methods (#593) [Florian Weingarten]
-* Include template name with line numbers in render errors (574) [Dylan Thacker-Smith]
-* Add sort_natural filter (#554) [Martin Hanzel]
-* Add forloop.parentloop as a reference to the parent loop (#520) [Justin Li]
-* Block parsing moved to BlockBody class (#458) [Dylan Thacker-Smith]
-* Add concat filter to concatenate arrays (#429) [Diogo Beato]
-* Ruby 1.9 support dropped (#491) [Justin Li]
-* Liquid::Template.file_system's read_template_file method is no longer passed the context. (#441) [James Reid-Smith]
-* Remove `liquid_methods` (See https://github.com/Shopify/liquid/pull/568 for replacement)
-* Liquid::Template.register_filter raises when the module overrides registered public methods as private or protected (#705) [Gaurav Chande]
-
-### Fixed
-
-* Fix variable names being detected as an operator when starting with contains (#788) [Michael Angell]
-* Fix include tag used with strict_variables (#828) [QuickPay]
-* Fix map filter when value is a Proc (#672) [Guillaume Malette]
-* Fix truncate filter when value is not a string (#672) [Guillaume Malette]
-* Fix behaviour of escape filter when input is nil (#665) [Tanel Jakobsoo]
-* Fix sort filter behaviour with empty array input (#652) [Marcel Cary]
-* Fix test failure under certain timezones (#631) [Dylan Thacker-Smith]
-* Fix bug in uniq filter (#595) [Florian Weingarten]
-* Fix bug when "blank" and "empty" are used as variable names (#592) [Florian Weingarten]
-* Fix condition parse order in strict mode (#569) [Justin Li]
-* Fix naming of the "context variable" when dynamically including a template (#559) [Justin Li]
-* Gracefully accept empty strings in the date filter (#555) [Loren Hale]
-* Fix capturing into variables with a hyphen in the name (#505) [Florian Weingarten]
-* Fix case sensitivity regression in date standard filter (#499) [Kelley Reynolds]
-* Disallow filters with no variable in strict mode (#475) [Justin Li]
-* Disallow variable names in the strict parser that are not valid in the lax parser (#463) [Justin Li]
-* Fix BlockBody#warnings taking exponential time to compute (#486) [Justin Li]
-
-## 3.0.5 / 2015-07-23 / branch "3-0-stable"
-
-* Fix test failure under certain timezones [Dylan Thacker-Smith]
-
-## 3.0.4 / 2015-07-17
-
-* Fix chained access to multi-dimensional hashes [Florian Weingarten]
-
-## 3.0.3 / 2015-05-28
-
-* Fix condition parse order in strict mode (#569) [Justin Li]
-
-## 3.0.2 / 2015-04-24
-
-* Expose VariableLookup private members (#551) [Justin Li]
-* Documentation fixes
-
-## 3.0.1 / 2015-01-23
-
-* Remove duplicate `index0` key in TableRow tag (#502) [Alfred Xing]
-
-## 3.0.0 / 2014-11-12
-
-* Removed Block#end_tag. Instead, override parse with `super` followed by your code. See #446 [Dylan Thacker-Smith]
-* Fixed condition with wrong data types (#423) [Bogdan Gusiev]
-* Add url_encode to standard filters (#421) [Derrick Reimer]
-* Add uniq to standard filters [Florian Weingarten]
-* Add exception_handler feature (#397) and #254 [Bogdan Gusiev, Florian Weingarten]
-* Optimize variable parsing to avoid repeated regex evaluation during template rendering #383 [Jason Hiltz-Laforge]
-* Optimize checking for block interrupts to reduce object allocation #380 [Jason Hiltz-Laforge]
-* Properly set context rethrow_errors on render! #349 [Thierry Joyal]
-* Fix broken rendering of variables which are equal to false (#345) [Florian Weingarten]
-* Remove ActionView template handler [Dylan Thacker-Smith]
-* Freeze lots of string literals for new Ruby 2.1 optimization (#297) [Florian Weingarten]
-* Allow newlines in tags and variables (#324) [Dylan Thacker-Smith]
-* Tag#parse is called after initialize, which now takes options instead of tokens as the 3rd argument. See #321 [Dylan Thacker-Smith]
-* Raise `Liquid::ArgumentError` instead of `::ArgumentError` when filter has wrong number of arguments #309 [Bogdan Gusiev]
-* Add a to_s default for liquid drops (#306) [Adam Doeler]
-* Add strip, lstrip, and rstrip to standard filters [Florian Weingarten]
-* Make if, for & case tags return complete and consistent nodelists (#250) [Nick Jones]
-* Prevent arbitrary method invocation on condition objects (#274) [Dylan Thacker-Smith]
-* Don't call to_sym when creating conditions for security reasons (#273) [Bouke van der Bijl]
-* Fix resource counting bug with respond_to?(:length) (#263) [Florian Weingarten]
-* Allow specifying custom patterns for template filenames (#284) [Andrei Gladkyi]
-* Allow drops to optimize loading a slice of elements (#282) [Tom Burns]
-* Support for passing variables to snippets in subdirs (#271) [Joost Hietbrink]
-* Add a class cache to avoid runtime extend calls (#249) [James Tucker]
-* Remove some legacy Ruby 1.8 compatibility code (#276) [Florian Weingarten]
-* Add default filter to standard filters (#267) [Derrick Reimer]
-* Add optional strict parsing and warn parsing (#235) [Tristan Hume]
-* Add I18n syntax error translation (#241) [Simon Hørup Eskildsen, Sirupsen]
-* Make sort filter work on enumerable drops (#239) [Florian Weingarten]
-* Fix clashing method names in enumerable drops (#238) [Florian Weingarten]
-* Make map filter work on enumerable drops (#233) [Florian Weingarten]
-* Improved whitespace stripping for blank blocks, related to #216 [Florian Weingarten]
-
-## 2.6.3 / 2015-07-23 / branch "2-6-stable"
-
-* Fix test failure under certain timezones [Dylan Thacker-Smith]
-
-## 2.6.2 / 2015-01-23
-
-* Remove duplicate hash key [Parker Moore]
-
-## 2.6.1 / 2014-01-10
-
-Security fix, cherry-picked from master (4e14a65):
-* Don't call to_sym when creating conditions for security reasons (#273) [Bouke van der Bijl]
-* Prevent arbitrary method invocation on condition objects (#274) [Dylan Thacker-Smith]
-
-## 2.6.0 / 2013-11-25
 
 IMPORTANT: Liquid 2.6 is going to be the last version of Liquid which maintains explicit Ruby 1.8 compatability.
 The following releases will only be tested against Ruby 1.9 and Ruby 2.0 and are likely to break on Ruby 1.8.
 
 * Bugfix for #106: fix example servlet [gnowoel]
-* Bugfix for #97: strip_html filter supports multi-line tags [Jo Liss]
+* Bugfix for #97: strip_html filter supports multi-line tags [Jo Liss, joliss]
-* Bugfix for #114: strip_html filter supports style tags [James Allardice]
+* Bugfix for #114: strip_html filter supports style tags [James Allardice, jamesallardice]
-* Bugfix for #117: 'now' support for date filter in Ruby 1.9 [Notre Dame Webgroup]
+* Bugfix for #117: 'now' support for date filter in Ruby 1.9 [Notre Dame Webgroup, ndwebgroup]
-* Bugfix for #166: truncate filter on UTF-8 strings with Ruby 1.8 [Florian Weingarten]
+* Bugfix for #166: truncate filter on UTF-8 strings with Ruby 1.8 [Florian Weingarten, fw42]
-* Bugfix for #204: 'raw' parsing bug [Florian Weingarten]
+* Bugfix for #204: 'raw' parsing bug [Florian Weingarten, fw42]
-* Bugfix for #150: 'for' parsing bug [Peter Schröder]
+* Bugfix for #150: 'for' parsing bug [Peter Schröder, phoet]
-* Bugfix for #126: Strip CRLF in strip_newline [Peter Schröder]
+* Bugfix for #126: Strip CRLF in strip_newline [Peter Schröder, phoet]
-* Bugfix for #174, "can't convert Fixnum into String" for "replace" [jsw0528]
+* Bugfix for #174, "can't convert Fixnum into String" for "replace" [wǒ_is神仙, jsw0528]
-* Allow a Liquid::Drop to be passed into Template#render [Daniel Huckstep]
+* Allow a Liquid::Drop to be passed into Template#render [Daniel Huckstep, darkhelmet]
-* Resource limits [Florian Weingarten]
+* Resource limits [Florian Weingarten, fw42]
-* Add reverse filter [Jay Strybis]
+* Add reverse filter [Jay Strybis, unreal]
 * Add utf-8 support
-* Use array instead of Hash to keep the registered filters [Tasos Stathopoulos]
+* Use array instead of Hash to keep the registered filters [Tasos Stathopoulos, astathopoulos]
-* Cache tokenized partial templates [Tom Burns]
+* Cache tokenized partial templates [Tom Burns, boourns]
-* Avoid warnings in Ruby 1.9.3 [Marcus Stollsteimer]
+* Avoid warnings in Ruby 1.9.3 [Marcus Stollsteimer, stomar]
-* Better documentation for 'include' tag (closes #163) [Peter Schröder]
+* Better documentation for 'include' tag (closes #163) [Peter Schröder, phoet]
-* Use of BigDecimal on filters to have better precision (closes #155) [Arthur Nogueira Neves]
+* Use of BigDecimal on filters to have better precision (closes #155) [Arthur Nogueira Neves, arthurnn]
 
-## 2.5.5 / 2014-01-10 / branch "2-5-stable"
+## 2.5.4 / 2013-11-11 / branch "2.5-stable"
 
-Security fix, cherry-picked from master (4e14a65):
+* Fix "can't convert Fixnum into String" for "replace", see #173, [wǒ_is神仙, jsw0528]
-* Don't call to_sym when creating conditions for security reasons (#273) [Bouke van der Bijl]
-* Prevent arbitrary method invocation on condition objects (#274) [Dylan Thacker-Smith]
-
-## 2.5.4 / 2013-11-11
-
-* Fix "can't convert Fixnum into String" for "replace" (#173), [jsw0528]
 
 ## 2.5.3 / 2013-10-09
 
-* #232, #234, #237: Fix map filter bugs [Florian Weingarten]
+* #232, #234, #237: Fix map filter bugs [Florian Weingarten, fw42]
 
 ## 2.5.2 / 2013-09-03 / deleted
 
@@ -210,7 +64,7 @@ Yanked from rubygems, as it contained too many changes that broke compatibility.
 
 ## 2.5.1 / 2013-07-24
 
-* #230: Fix security issue with map filter, Use invoke_drop in map filter [Florian Weingarten]
+* #230: Fix security issue with map filter, Use invoke_drop in map filter [Florian Weingarten, fw42]
 
 ## 2.5.0 / 2013-03-06
 

README.md

@@ -1,6 +1,4 @@
-[![Build Status](https://api.travis-ci.org/Shopify/liquid.svg?branch=master)](http://travis-ci.org/Shopify/liquid)
+[![Build Status](https://secure.travis-ci.org/Shopify/liquid.png?branch=master)](http://travis-ci.org/Shopify/liquid)
-[![Inline docs](http://inch-ci.org/github/Shopify/liquid.svg?branch=master)](http://inch-ci.org/github/Shopify/liquid)
-
 # Liquid template engine
 
 * [Contributing guidelines](CONTRIBUTING.md)
@@ -42,8 +40,6 @@ Liquid is a template engine which was written with very specific requirements:
 
 ## How to use Liquid
 
-Install Liquid by adding `gem 'liquid'` to your gemfile.
-
 Liquid supports a very simple API based around the Liquid::Template class.
 For standard use you can just pass it the content of a file and call render with a parameters hash.
 
@@ -75,40 +71,3 @@ This is useful for doing things like enabling strict mode only in the theme edit
 
 It is recommended that you enable `:strict` or `:warn` mode on new apps to stop invalid templates from being created.
 It is also recommended that you use it in the template editors of existing apps to give editors better error messages.
-
-### Undefined variables and filters
-
-By default, the renderer doesn't raise or in any other way notify you if some variables or filters are missing, i.e. not passed to the `render` method.
-You can improve this situation by passing `strict_variables: true` and/or `strict_filters: true` options to the `render` method.
-When one of these options is set to true, all errors about undefined variables and undefined filters will be stored in `errors` array of a `Liquid::Template` instance.
-Here are some examples:
-
-```ruby
-template = Liquid::Template.parse("{{x}} {{y}} {{z.a}} {{z.b}}")
-template.render({ 'x' => 1, 'z' => { 'a' => 2 } }, { strict_variables: true })
-#=> '1  2 ' # when a variable is undefined, it's rendered as nil
-template.errors
-#=> [#<Liquid::UndefinedVariable: Liquid error: undefined variable y>, #<Liquid::UndefinedVariable: Liquid error: undefined variable b>]
-```
-
-```ruby
-template = Liquid::Template.parse("{{x | filter1 | upcase}}")
-template.render({ 'x' => 'foo' }, { strict_filters: true })
-#=> '' # when at least one filter in the filter chain is undefined, a whole expression is rendered as nil
-template.errors
-#=> [#<Liquid::UndefinedFilter: Liquid error: undefined filter filter1>]
-```
-
-If you want to raise on a first exception instead of pushing all of them in `errors`, you can use `render!` method:
-
-```ruby
-template = Liquid::Template.parse("{{x}} {{y}}")
-template.render!({ 'x' => 1}, { strict_variables: true })
-#=> Liquid::UndefinedVariable: Liquid error: undefined variable y
-```
-
-### Usage tracking
-
-To help track usages of a feature or code path in production, we have released opt-in usage tracking. To enable this, we provide an empty `Liquid:: Usage.increment` method which you can customize to your needs. The feature is well suited to https://github.com/Shopify/statsd-instrument. However, the choice of implementation is up to you.
-
-Once you have enabled usage tracking, we recommend reporting any events through Github Issues that your system may be logging. It is highly likely this event has been added to consider deprecating or improving code specific to this event, so please raise any concerns.

Rakefile

@@ -1,64 +1,42 @@
-# frozen_string_literal: true
-
 require 'rake'
 require 'rake/testtask'
-$LOAD_PATH.unshift(File.expand_path("../lib", __FILE__))
+$LOAD_PATH.unshift File.expand_path("../lib", __FILE__)
 require "liquid/version"
 
-task(default: [:test, :rubocop])
+task :default => 'test'
 
-desc('run test suite with default parser')
+desc 'run test suite with default parser'
 Rake::TestTask.new(:base_test) do |t|
   t.libs << '.' << 'lib' << 'test'
-  t.test_files = FileList['test/{integration,unit}/**/*_test.rb']
+  t.test_files = FileList['test/liquid/**/*_test.rb']
   t.verbose = false
 end
 
-desc('run test suite with warn error mode')
+desc 'run test suite with warn error mode'
 task :warn_test do
   ENV['LIQUID_PARSER_MODE'] = 'warn'
   Rake::Task['base_test'].invoke
 end
 
-task :rubocop do
+desc 'runs test suite with both strict and lax parsers'
-  if RUBY_ENGINE == 'ruby'
-    require 'rubocop/rake_task'
-    RuboCop::RakeTask.new
-  end
-end
-
-desc('runs test suite with both strict and lax parsers')
 task :test do
   ENV['LIQUID_PARSER_MODE'] = 'lax'
   Rake::Task['base_test'].invoke
-
   ENV['LIQUID_PARSER_MODE'] = 'strict'
   Rake::Task['base_test'].reenable
   Rake::Task['base_test'].invoke
-
-  if RUBY_ENGINE == 'ruby' || RUBY_ENGINE == 'truffleruby'
-    ENV['LIQUID_C'] = '1'
-
-    ENV['LIQUID_PARSER_MODE'] = 'lax'
-    Rake::Task['base_test'].reenable
-    Rake::Task['base_test'].invoke
-
-    ENV['LIQUID_PARSER_MODE'] = 'strict'
-    Rake::Task['base_test'].reenable
-    Rake::Task['base_test'].invoke
-  end
 end
 
-task(gem: :build)
+task :gem => :build
 task :build do
   system "gem build liquid.gemspec"
 end
 
-task install: :build do
+task :install => :build do
   system "gem install liquid-#{Liquid::VERSION}.gem"
 end
 
-task release: :build do
+task :release => :build do
   system "git tag -a v#{Liquid::VERSION} -m 'Tagging #{Liquid::VERSION}'"
   system "git push --tags"
   system "gem push liquid-#{Liquid::VERSION}.gem"
@@ -66,6 +44,7 @@ task release: :build do
 end
 
 namespace :benchmark do
+
   desc "Run the liquid benchmark with lax parsing"
   task :run do
     ruby "./performance/benchmark.rb lax"
@@ -77,7 +56,9 @@ namespace :benchmark do
   end
 end
 
+
 namespace :profile do
+
   desc "Run the liquid profile/performance coverage"
   task :run do
     ruby "./performance/profile.rb"
@@ -87,20 +68,18 @@ namespace :profile do
   task :strict do
     ruby "./performance/profile.rb strict"
   end
+
 end
 
-namespace :memory_profile do
+desc "Run example"
-  desc "Run memory profiler"
-  task :run do
-    ruby "./performance/memory_profile.rb"
-  end
-end
-
-desc("Run example")
 task :example do
   ruby "-w -d -Ilib example/server/server.rb"
 end
 
-task :console do
+if defined?(RUBY_ENGINE) && RUBY_ENGINE == 'ruby'
-  exec 'irb -I lib -r liquid'
+  require 'rake/extensiontask'
+  Rake::ExtensionTask.new "liquid" do |ext|
+    ext.lib_dir = "lib/liquid"
+  end
+  Rake::Task[:test].prerequisites << :compile
 end

example/server/example_servlet.rb

@@ -1,12 +1,10 @@
-# frozen_string_literal: true
-
 module ProductsFilter
   def price(integer)
-    format("$%.2d USD", integer / 100.0)
+    sprintf("$%.2d USD", integer / 100.0)
   end
 
   def prettyprint(text)
-    text.gsub(/\*(.*)\*/, '<b>\1</b>')
+    text.gsub( /\*(.*)\*/, '<b>\1</b>' )
   end
 
   def count(array)
@@ -19,28 +17,25 @@ module ProductsFilter
 end
 
 class Servlet < LiquidServlet
+
   def index
     { 'date' => Time.now }
   end
 
   def products
-    { 'products' => products_list, 'more_products' => more_products_list, 'description' => description, 'section' => 'Snowboards', 'cool_products' => true }
+    { 'products' => products_list, 'description' => description, 'section' => 'Snowboards', 'cool_products' => true}
   end
 
   private
 
   def products_list
-    [{ 'name' => 'Arbor Draft', 'price' => 39900, 'description' => 'the *arbor draft* is a excellent product' },
+    [{'name' => 'Arbor Draft', 'price' => 39900, 'description' => 'the *arbor draft* is a excellent product' },
-     { 'name' => 'Arbor Element', 'price' => 40000, 'description' => 'the *arbor element* rocks for freestyling' },
+    {'name' => 'Arbor Element', 'price' => 40000, 'description' => 'the *arbor element* rocks for freestyling'},
-     { 'name' => 'Arbor Diamond', 'price' => 59900, 'description' => 'the *arbor diamond* is a made up product because im obsessed with arbor and have no creativity' }]
+    {'name' => 'Arbor Diamond', 'price' => 59900, 'description' => 'the *arbor diamond* is a made up product because im obsessed with arbor and have no creativity'}]
-  end
-
-  def more_products_list
-    [{ 'name' => 'Arbor Catalyst', 'price' => 39900, 'description' => 'the *arbor catalyst* is an advanced drop-through for freestyle and flatground performance and versatility' },
-     { 'name' => 'Arbor Fish', 'price' => 40000, 'description' => 'the *arbor fish* is a compact pin that features an extended wheelbase and time-honored teardrop shape' }]
   end
 
   def description
     "List of Products ~ This is a list of products with price and description."
   end
+
 end

example/server/liquid_servlet.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 class LiquidServlet < WEBrick::HTTPServlet::AbstractServlet
+
   def do_GET(req, res)
     handle(:get, req, res)
   end
@@ -11,20 +10,19 @@ class LiquidServlet < WEBrick::HTTPServlet::AbstractServlet
 
   private
 
-  def handle(_type, req, res)
+  def handle(type, req, res)
-    @request = req
+    @request, @response = req, res
-    @response = res
 
     @request.path_info =~ /(\w+)\z/
-    @action = Regexp.last_match(1) || 'index'
+    @action = $1 || 'index'
     @assigns = send(@action) if respond_to?(@action)
 
     @response['Content-Type'] = "text/html"
     @response.status = 200
-    @response.body = Liquid::Template.parse(read_template).render(@assigns, filters: [ProductsFilter])
+    @response.body = Liquid::Template.parse(read_template).render(@assigns, :filters => [ProductsFilter])
   end
 
   def read_template(filename = @action)
-    File.read("#{__dir__}/templates/#{filename}.liquid")
+    File.read( File.dirname(__FILE__) + "/templates/#{filename}.liquid" )
   end
 end

example/server/server.rb

@@ -1,14 +1,14 @@
-# frozen_string_literal: true
-
 require 'webrick'
 require 'rexml/document'
 
-require_relative '../../lib/liquid'
+DIR = File.expand_path(File.dirname(__FILE__))
-require_relative 'liquid_servlet'
+
-require_relative 'example_servlet'
+require DIR + '/../../lib/liquid'
+require DIR + '/liquid_servlet'
+require DIR + '/example_servlet'
 
 # Setup webrick
-server = WEBrick::HTTPServer.new(Port: ARGV[1] || 3000)
+server = WEBrick::HTTPServer.new( :Port => ARGV[1] || 3000 )
 server.mount('/', Servlet)
-trap("INT") { server.shutdown }
+trap("INT"){ server.shutdown }
 server.start

example/server/templates/index.liquid

@@ -3,4 +3,4 @@
 <p>It is {{date}}</p>
 
 
-<p>Check out the <a href="/products">Products</a> screen </p>
+<p>Check out the <a href="http://localhost:3000/products">Products</a> screen </p>

example/server/templates/products.liquid

@@ -16,12 +16,12 @@
   </head>
 
   <body>
-    {% assign all_products = products | concat: more_products  %}
+
     <h1>{{ description | split: '~' | first }}</h1>
 
     <h2>{{ description | split: '~' | last }}</h2>
 
-    <h2>There are currently {{all_products | count}} products in the {{section}} catalog</h2>
+    <h2>There are currently {{products | count}} products in the {{section}} catalog</h2>
 
     {% if cool_products %}
       Cool products :)
@@ -31,7 +31,7 @@
 
     <ul id="products">
 
-      {% for product in all_products %}
+      {% for product in products %}
         <li>
           <h2>{{product.name}}</h2>
           Only {{product.price | price }}

ext/liquid/extconf.rb

@@ -0,0 +1,4 @@
+require 'mkmf'
+$CFLAGS << ' -Wall -Werror'
+$warnflags.gsub!(/-Wdeclaration-after-statement/, "")
+create_makefile("liquid/liquid")

ext/liquid/liquid.c

@@ -0,0 +1,9 @@
+#include "liquid.h"
+
+VALUE mLiquid;
+
+void Init_liquid(void)
+{
+    mLiquid = rb_define_module("Liquid");
+    init_liquid_tokenizer();
+}

ext/liquid/liquid.h

@@ -0,0 +1,11 @@
+#ifndef LIQUID_H
+#define LIQUID_H
+
+#include <ruby.h>
+#include <stdbool.h>
+
+#include "tokenizer.h"
+
+extern VALUE mLiquid;
+
+#endif

ext/liquid/tokenizer.c

@@ -0,0 +1,137 @@
+#include "liquid.h"
+
+VALUE cLiquidTokenizer;
+
+static void tokenizer_mark(void *ptr) {
+    tokenizer_t *tokenizer = ptr;
+    rb_gc_mark(tokenizer->source);
+}
+
+static void tokenizer_free(void *ptr)
+{
+    tokenizer_t *tokenizer = ptr;
+    xfree(tokenizer);
+}
+
+static size_t tokenizer_memsize(const void *ptr)
+{
+    return ptr ? sizeof(tokenizer_t) : 0;
+}
+
+const rb_data_type_t tokenizer_data_type = {
+    "liquid_tokenizer",
+    {tokenizer_mark, tokenizer_free, tokenizer_memsize,},
+#ifdef RUBY_TYPED_FREE_IMMEDIATELY
+    NULL, NULL, RUBY_TYPED_FREE_IMMEDIATELY
+#endif
+};
+
+static VALUE tokenizer_allocate(VALUE klass)
+{
+    VALUE obj;
+    tokenizer_t *tokenizer;
+
+    obj = TypedData_Make_Struct(klass, tokenizer_t, &tokenizer_data_type, tokenizer);
+    tokenizer->source = Qnil;
+    return obj;
+}
+
+static VALUE tokenizer_initialize_method(VALUE self, VALUE source)
+{
+    tokenizer_t *tokenizer;
+
+    Check_Type(source, T_STRING);
+    Tokenizer_Get_Struct(self, tokenizer);
+    source = rb_str_dup_frozen(source);
+    tokenizer->source = source;
+    tokenizer->cursor = RSTRING_PTR(source);
+    tokenizer->length = RSTRING_LEN(source);
+    return Qnil;
+}
+
+void tokenizer_next(tokenizer_t *tokenizer, token_t *token)
+{
+    if (tokenizer->length <= 0) {
+        memset(token, 0, sizeof(*token));
+        return;
+    }
+
+    const char *cursor = tokenizer->cursor;
+    const char *last = cursor + tokenizer->length - 1;
+
+    token->str = cursor;
+    token->type = TOKEN_STRING;
+
+    while (cursor < last) {
+        if (*cursor++ != '{')
+            continue;
+
+        char c = *cursor++;
+        if (c != '%' && c != '{')
+            continue;
+        if (cursor - tokenizer->cursor > 2) {
+            token->type = TOKEN_STRING;
+            cursor -= 2;
+            goto found;
+        }
+        token->type = TOKEN_INVALID;
+        if (c == '%') {
+            while (cursor < last) {
+                if (*cursor++ != '%')
+                    continue;
+                c = *cursor++;
+                while (c == '%' && cursor <= last)
+                    c = *cursor++;
+                if (c != '}')
+                    continue;
+                token->type = TOKEN_TAG;
+                goto found;
+            }
+            // unterminated tag
+            cursor = tokenizer->cursor + 2;
+            goto found;
+        } else {
+            while (cursor < last) {
+                if (*cursor++ != '}')
+                    continue;
+                if (*cursor++ != '}') {
+                    // variable incomplete end, used to end raw tags
+                    cursor--;
+                    goto found;
+                }
+                token->type = TOKEN_VARIABLE;
+                goto found;
+            }
+            // unterminated variable
+            cursor = tokenizer->cursor + 2;
+            goto found;
+        }
+    }
+    cursor = last + 1;
+found:
+    token->length = cursor - tokenizer->cursor;
+    tokenizer->cursor += token->length;
+    tokenizer->length -= token->length;
+}
+
+static VALUE tokenizer_next_method(VALUE self)
+{
+    tokenizer_t *tokenizer;
+    Tokenizer_Get_Struct(self, tokenizer);
+
+    token_t token;
+    tokenizer_next(tokenizer, &token);
+    if (token.type == TOKEN_NONE)
+        return Qnil;
+
+    return rb_str_new(token.str, token.length);
+}
+
+void init_liquid_tokenizer()
+{
+    cLiquidTokenizer = rb_define_class_under(mLiquid, "Tokenizer", rb_cObject);
+    rb_define_alloc_func(cLiquidTokenizer, tokenizer_allocate);
+    rb_define_method(cLiquidTokenizer, "initialize", tokenizer_initialize_method, 1);
+    rb_define_method(cLiquidTokenizer, "next", tokenizer_next_method, 0);
+    rb_define_alias(cLiquidTokenizer, "shift", "next");
+}

ext/liquid/tokenizer.h

@@ -0,0 +1,31 @@
+#ifndef LIQUID_TOKENIZER_H
+#define LIQUID_TOKENIZER_H
+
+enum token_type {
+    TOKEN_NONE,
+    TOKEN_INVALID,
+    TOKEN_STRING,
+    TOKEN_TAG,
+    TOKEN_VARIABLE
+};
+
+typedef struct token {
+    enum token_type type;
+    const char *str;
+    long length;
+} token_t;
+
+typedef struct tokenizer {
+    VALUE source;
+    const char *cursor;
+    long length;
+} tokenizer_t;
+
+extern VALUE cLiquidTokenizer;
+extern const rb_data_type_t tokenizer_data_type;
+#define Tokenizer_Get_Struct(obj, sval) TypedData_Get_Struct(obj, tokenizer_t, &tokenizer_data_type, sval)
+
+void init_liquid_tokenizer();
+void tokenizer_next(tokenizer_t *tokenizer, token_t *token);
+
+#endif

init.rb

@@ -0,0 +1,8 @@
+require 'liquid'
+require 'extras/liquid_view'
+
+if defined? ActionView::Template and ActionView::Template.respond_to? :register_template_handler
+  ActionView::Template
+else
+  ActionView::Base
+end.register_template_handler(:liquid, LiquidView)

lib/extras/liquid_view.rb

@@ -0,0 +1,51 @@
+# LiquidView is a action view extension class. You can register it with rails
+# and use liquid as an template system for .liquid files
+#
+# Example
+#
+#   ActionView::Base::register_template_handler :liquid, LiquidView
+class LiquidView
+  PROTECTED_ASSIGNS = %w( template_root response _session template_class action_name request_origin session template
+                          _response url _request _cookies variables_added _flash params _headers request cookies
+                          ignore_missing_templates flash _params logger before_filter_chain_aborted headers )
+  PROTECTED_INSTANCE_VARIABLES = %w( @_request @controller @_first_render @_memoized__pick_template @view_paths
+                                     @helpers @assigns_added @template @_render_stack @template_format @assigns )
+
+  def self.call(template)
+    "LiquidView.new(self).render(template, local_assigns)"
+  end
+
+  def initialize(view)
+    @view = view
+  end
+
+  def render(template, local_assigns = nil)
+    @view.controller.headers["Content-Type"] ||= 'text/html; charset=utf-8'
+
+    # Rails 2.2 Template has source, but not locals
+    if template.respond_to?(:source) && !template.respond_to?(:locals)
+      assigns = (@view.instance_variables - PROTECTED_INSTANCE_VARIABLES).inject({}) do |hash, ivar|
+                  hash[ivar[1..-1]] = @view.instance_variable_get(ivar)
+                  hash
+                end
+    else
+      assigns = @view.assigns.reject{ |k,v| PROTECTED_ASSIGNS.include?(k) }
+    end
+
+    source = template.respond_to?(:source) ? template.source : template
+    local_assigns = (template.respond_to?(:locals) ? template.locals : local_assigns) || {}
+
+    if content_for_layout = @view.instance_variable_get("@content_for_layout")
+      assigns['content_for_layout'] = content_for_layout
+    end
+    assigns.merge!(local_assigns.stringify_keys)
+
+    liquid = Liquid::Template.parse(source)
+    liquid.render(assigns, :filters => [@view.controller.master_helper_module], :registers => {:action_view => @view, :controller => @view.controller})
+  end
+
+  def compilable?
+    false
+  end
+
+end

lib/liquid.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # Copyright (c) 2005 Tobias Luetke
 #
 # Permission is hereby granted, free of charge, to any person obtaining
@@ -23,65 +21,48 @@
 
 module Liquid
   FilterSeparator             = /\|/
-  ArgumentSeparator           = ','
+  ArgumentSeparator           = ','.freeze
-  FilterArgumentSeparator     = ':'
+  FilterArgumentSeparator     = ':'.freeze
-  VariableAttributeSeparator  = '.'
+  VariableAttributeSeparator  = '.'.freeze
-  WhitespaceControl           = '-'
   TagStart                    = /\{\%/
   TagEnd                      = /\%\}/
   VariableSignature           = /\(?[\w\-\.\[\]]\)?/
   VariableSegment             = /[\w\-]/
   VariableStart               = /\{\{/
   VariableEnd                 = /\}\}/
-  VariableIncompleteEnd       = /\}\}?/
   QuotedString                = /"[^"]*"|'[^']*'/
   QuotedFragment              = /#{QuotedString}|(?:[^\s,\|'"]|#{QuotedString})+/o
   TagAttributes               = /(\w+)\s*\:\s*(#{QuotedFragment})/o
-  AnyStartingTag              = /#{TagStart}|#{VariableStart}/o
-  PartialTemplateParser       = /#{TagStart}.*?#{TagEnd}|#{VariableStart}.*?#{VariableIncompleteEnd}/om
-  TemplateParser              = /(#{PartialTemplateParser}|#{AnyStartingTag})/om
   VariableParser              = /\[[^\]]+\]|#{VariableSegment}+\??/o
-
-  singleton_class.send(:attr_accessor, :cache_classes)
-  self.cache_classes = true
 end
 
 require "liquid/version"
-require 'liquid/parse_tree_visitor'
 require 'liquid/lexer'
 require 'liquid/parser'
 require 'liquid/i18n'
 require 'liquid/drop'
-require 'liquid/tablerowloop_drop'
-require 'liquid/forloop_drop'
 require 'liquid/extensions'
 require 'liquid/errors'
 require 'liquid/interrupts'
 require 'liquid/strainer'
-require 'liquid/expression'
 require 'liquid/context'
-require 'liquid/parser_switching'
 require 'liquid/tag'
 require 'liquid/block'
-require 'liquid/block_body'
 require 'liquid/document'
 require 'liquid/variable'
-require 'liquid/variable_lookup'
-require 'liquid/range_lookup'
 require 'liquid/file_system'
-require 'liquid/resource_limits'
 require 'liquid/template'
 require 'liquid/standardfilters'
 require 'liquid/condition'
+require 'liquid/module_ex'
 require 'liquid/utils'
-require 'liquid/tokenizer'
-require 'liquid/parse_context'
-require 'liquid/partial_cache'
-require 'liquid/usage'
-require 'liquid/register'
-require 'liquid/static_registers'
 
 # Load all the tags of the standard library
 #
-Dir["#{__dir__}/liquid/tags/*.rb"].each { |f| require f }
+Dir[File.dirname(__FILE__) + '/liquid/tags/*.rb'].each { |f| require f }
-Dir["#{__dir__}/liquid/registers/*.rb"].each { |f| require f }
+
+if defined?(RUBY_ENGINE) && RUBY_ENGINE == 'ruby'
+  require 'liquid/liquid'
+else
+  require 'liquid/tokenizer'
+end

lib/liquid/block.rb

@@ -1,80 +1,156 @@
-# frozen_string_literal: true
-
 module Liquid
   class Block < Tag
-    MAX_DEPTH = 100
+    IsTag             = /\A#{TagStart}/o
+    IsVariable        = /\A#{VariableStart}/o
+    FullToken         = /\A#{TagStart}\s*(\w+)\s*(.*)?#{TagEnd}\z/om
+    ContentOfVariable = /\A#{VariableStart}(.*)#{VariableEnd}\z/om
 
-    def initialize(tag_name, markup, options)
+    def blank?
-      super
+      @blank || false
-      @blank = true
     end
 
     def parse(tokens)
-      @body = BlockBody.new
+      @blank = true
-      while parse_body(@body, tokens)
+      @nodelist ||= []
+      @nodelist.clear
+
+      # All child tags of the current block.
+      @children = []
+
+      while token = tokens.shift
+        case token
+        when IsTag
+          if token =~ FullToken
+
+            # if we found the proper block delimiter just end parsing here and let the outer block
+            # proceed
+            if block_delimiter == $1
+              end_tag
+              return
+            end
+
+            # fetch the tag from registered blocks
+            if tag = Template.tags[$1]
+              new_tag = tag.parse($1, $2, tokens, @options)
+              @blank &&= new_tag.blank?
+              @nodelist << new_tag
+              @children << new_tag
+            else
+              # this tag is not registered with the system
+              # pass it to the current block for special handling or error reporting
+              unknown_tag($1, $2, tokens)
+            end
+          else
+            raise SyntaxError.new(options[:locale].t("errors.syntax.tag_termination".freeze, :token => token, :tag_end => TagEnd.inspect))
+          end
+        when IsVariable
+          new_var = create_variable(token)
+          @nodelist << new_var
+          @children << new_var
+          @blank = false
+        when ''.freeze
+          # pass
+        else
+          @nodelist << token
+          @blank &&= (token =~ /\A\s*\z/)
+        end
       end
+
+      # Make sure that it's ok to end parsing in the current block.
+      # Effectively this method will throw an exception unless the current block is
+      # of type Document
+      assert_missing_delimitation!
     end
 
-    # For backwards compatibility
+    # warnings of this block and all sub-tags
-    def render(context)
+    def warnings
-      @body.render(context)
+      all_warnings = []
+      all_warnings.concat(@warnings) if @warnings
+
+      (@children || []).each do |node|
+        all_warnings.concat(node.warnings || [])
+      end
+
+      all_warnings
     end
 
-    def blank?
+    def end_tag
-      @blank
     end
 
-    def nodelist
+    def unknown_tag(tag, params, tokens)
-      @body.nodelist
+      case tag
-    end
+      when 'else'.freeze
-
+        raise SyntaxError.new(options[:locale].t("errors.syntax.unexpected_else".freeze,
-    def unknown_tag(tag, _params, _tokens)
+                                                 :block_name => block_name))
-      if tag == 'else'
+      when 'end'.freeze
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_else",
+        raise SyntaxError.new(options[:locale].t("errors.syntax.invalid_delimiter".freeze,
-          block_name: block_name)
+                                                 :block_name => block_name,
-      elsif tag.start_with?('end')
+                                                 :block_delimiter => block_delimiter))
-        raise SyntaxError, parse_context.locale.t("errors.syntax.invalid_delimiter",
-          tag: tag,
-          block_name: block_name,
-          block_delimiter: block_delimiter)
       else
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag", tag: tag)
+        raise SyntaxError.new(options[:locale].t("errors.syntax.unknown_tag".freeze, :tag => tag))
       end
     end
 
+    def block_delimiter
+      "end#{block_name}"
+    end
+
     def block_name
       @tag_name
     end
 
-    def block_delimiter
+    def create_variable(token)
-      @block_delimiter ||= "end#{block_name}"
+      token.scan(ContentOfVariable) do |content|
+        return Variable.new(content.first, @options)
+      end
+      raise SyntaxError.new(options[:locale].t("errors.syntax.variable_termination".freeze, :token => token, :tag_end => VariableEnd.inspect))
+    end
+
+    def render(context)
+      render_all(@nodelist, context)
     end
 
     protected
 
-    def parse_body(body, tokens)
+    def assert_missing_delimitation!
-      if parse_context.depth >= MAX_DEPTH
+      raise SyntaxError.new(options[:locale].t("errors.syntax.tag_never_closed".freeze, :block_name => block_name))
-        raise StackLevelError, "Nesting too deep"
+    end
-      end
-      parse_context.depth += 1
-      begin
-        body.parse(tokens, parse_context) do |end_tag_name, end_tag_params|
-          @blank &&= body.blank?
 
-          return false if end_tag_name == block_delimiter
+    def render_all(list, context)
-          unless end_tag_name
+      output = []
-            raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
+      context.resource_limits[:render_length_current] = 0
+      context.resource_limits[:render_score_current] += list.length
+
+      list.each do |token|
+        # Break out if we have any unhanded interrupts.
+        break if context.has_interrupt?
+
+        begin
+          # If we get an Interrupt that means the block must stop processing. An
+          # Interrupt is any command that stops block execution such as {% break %}
+          # or {% continue %}
+          if token.is_a? Continue or token.is_a? Break
+            context.push_interrupt(token.interrupt)
+            break
           end
 
-          # this tag is not registered with the system
+          token_output = (token.respond_to?(:render) ? token.render(context) : token)
-          # pass it to the current block for special handling or error reporting
+          context.increment_used_resources(:render_length_current, token_output)
-          unknown_tag(end_tag_name, end_tag_params, tokens)
+          if context.resource_limits_reached?
+            context.resource_limits[:reached] = true
+            raise MemoryError.new("Memory limits exceeded".freeze)
+          end
+          unless token.is_a?(Block) && token.blank?
+            output << token_output
+          end
+        rescue MemoryError => e
+          raise e
+        rescue ::StandardError => e
+          output << (context.handle_error(e))
         end
-      ensure
-        parse_context.depth -= 1
       end
 
-      true
+      output.join
     end
   end
 end

lib/liquid/block_body.rb

@@ -1,202 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class BlockBody
-    LiquidTagToken = /\A\s*(\w+)\s*(.*?)\z/o
-    FullToken = /\A#{TagStart}#{WhitespaceControl}?(\s*)(\w+)(\s*)(.*?)#{WhitespaceControl}?#{TagEnd}\z/om
-    ContentOfVariable = /\A#{VariableStart}#{WhitespaceControl}?(.*?)#{WhitespaceControl}?#{VariableEnd}\z/om
-    WhitespaceOrNothing = /\A\s*\z/
-    TAGSTART = "{%"
-    VARSTART = "{{"
-
-    attr_reader :nodelist
-
-    def initialize
-      @nodelist = []
-      @blank = true
-    end
-
-    def parse(tokenizer, parse_context, &block)
-      parse_context.line_number = tokenizer.line_number
-
-      if tokenizer.for_liquid_tag
-        parse_for_liquid_tag(tokenizer, parse_context, &block)
-      else
-        parse_for_document(tokenizer, parse_context, &block)
-      end
-    end
-
-    private def parse_for_liquid_tag(tokenizer, parse_context)
-      while (token = tokenizer.shift)
-        unless token.empty? || token =~ WhitespaceOrNothing
-          unless token =~ LiquidTagToken
-            # line isn't empty but didn't match tag syntax, yield and let the
-            # caller raise a syntax error
-            return yield token, token
-          end
-          tag_name = Regexp.last_match(1)
-          markup = Regexp.last_match(2)
-          unless (tag = registered_tags[tag_name])
-            # end parsing if we reach an unknown tag and let the caller decide
-            # determine how to proceed
-            return yield tag_name, markup
-          end
-          new_tag = tag.parse(tag_name, markup, tokenizer, parse_context)
-          @blank &&= new_tag.blank?
-          @nodelist << new_tag
-        end
-        parse_context.line_number = tokenizer.line_number
-      end
-
-      yield nil, nil
-    end
-
-    private def parse_for_document(tokenizer, parse_context, &block)
-      while (token = tokenizer.shift)
-        next if token.empty?
-        case
-        when token.start_with?(TAGSTART)
-          whitespace_handler(token, parse_context)
-          unless token =~ FullToken
-            raise_missing_tag_terminator(token, parse_context)
-          end
-          tag_name = Regexp.last_match(2)
-          markup = Regexp.last_match(4)
-
-          if parse_context.line_number
-            # newlines inside the tag should increase the line number,
-            # particularly important for multiline {% liquid %} tags
-            parse_context.line_number += Regexp.last_match(1).count("\n") + Regexp.last_match(3).count("\n")
-          end
-
-          if tag_name == 'liquid'
-            liquid_tag_tokenizer = Tokenizer.new(markup, line_number: parse_context.line_number, for_liquid_tag: true)
-            next parse_for_liquid_tag(liquid_tag_tokenizer, parse_context, &block)
-          end
-
-          unless (tag = registered_tags[tag_name])
-            # end parsing if we reach an unknown tag and let the caller decide
-            # determine how to proceed
-            return yield tag_name, markup
-          end
-          new_tag = tag.parse(tag_name, markup, tokenizer, parse_context)
-          @blank &&= new_tag.blank?
-          @nodelist << new_tag
-        when token.start_with?(VARSTART)
-          whitespace_handler(token, parse_context)
-          @nodelist << create_variable(token, parse_context)
-          @blank = false
-        else
-          if parse_context.trim_whitespace
-            token.lstrip!
-          end
-          parse_context.trim_whitespace = false
-          @nodelist << token
-          @blank &&= !!(token =~ WhitespaceOrNothing)
-        end
-        parse_context.line_number = tokenizer.line_number
-      end
-
-      yield nil, nil
-    end
-
-    def whitespace_handler(token, parse_context)
-      if token[2] == WhitespaceControl
-        previous_token = @nodelist.last
-        if previous_token.is_a?(String)
-          previous_token.rstrip!
-        end
-      end
-      parse_context.trim_whitespace = (token[-3] == WhitespaceControl)
-    end
-
-    def blank?
-      @blank
-    end
-
-    def render(context)
-      render_to_output_buffer(context, +'')
-    end
-
-    def render_to_output_buffer(context, output)
-      context.resource_limits.render_score += @nodelist.length
-
-      idx = 0
-      while (node = @nodelist[idx])
-        previous_output_size = output.bytesize
-
-        case node
-        when String
-          output << node
-        when Variable
-          render_node(context, output, node)
-        when Block
-          render_node(context, node.blank? ? +'' : output, node)
-          break if context.interrupt? # might have happened in a for-block
-        when Continue, Break
-          # If we get an Interrupt that means the block must stop processing. An
-          # Interrupt is any command that stops block execution such as {% break %}
-          # or {% continue %}
-          context.push_interrupt(node.interrupt)
-          break
-        else # Other non-Block tags
-          render_node(context, output, node)
-          break if context.interrupt? # might have happened through an include
-        end
-        idx += 1
-
-        raise_if_resource_limits_reached(context, output.bytesize - previous_output_size)
-      end
-
-      output
-    end
-
-    private
-
-    def render_node(context, output, node)
-      if node.disabled?(context)
-        output << node.disabled_error_message
-        return
-      end
-      disable_tags(context, node.disabled_tags) do
-        node.render_to_output_buffer(context, output)
-      end
-    rescue UndefinedVariable, UndefinedDropMethod, UndefinedFilter => e
-      context.handle_error(e, node.line_number)
-    rescue ::StandardError => e
-      line_number = node.is_a?(String) ? nil : node.line_number
-      output << context.handle_error(e, line_number)
-    end
-
-    def disable_tags(context, tags, &block)
-      return yield if tags.empty?
-      context.registers[:disabled_tags].disable(tags, &block)
-    end
-
-    def raise_if_resource_limits_reached(context, length)
-      context.resource_limits.render_length += length
-      return unless context.resource_limits.reached?
-      raise MemoryError, "Memory limits exceeded"
-    end
-
-    def create_variable(token, parse_context)
-      token.scan(ContentOfVariable) do |content|
-        markup = content.first
-        return Variable.new(markup, parse_context)
-      end
-      raise_missing_variable_terminator(token, parse_context)
-    end
-
-    def raise_missing_tag_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination", token: token, tag_end: TagEnd.inspect)
-    end
-
-    def raise_missing_variable_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination", token: token, tag_end: VariableEnd.inspect)
-    end
-
-    def registered_tags
-      Template.tags
-    end
-  end
-end

lib/liquid/condition.rb

@@ -1,74 +1,55 @@
-# frozen_string_literal: true
-
 module Liquid
   # Container for liquid nodes which conveniently wraps decision making logic
   #
   # Example:
   #
-  #   c = Condition.new(1, '==', 1)
+  #   c = Condition.new('1', '==', '1')
   #   c.evaluate #=> true
   #
   class Condition #:nodoc:
     @@operators = {
-      '==' => ->(cond, left, right) {  cond.send(:equal_variables, left, right) },
+      '=='.freeze => lambda { |cond, left, right|  cond.send(:equal_variables, left, right) },
-      '!=' => ->(cond, left, right) { !cond.send(:equal_variables, left, right) },
+      '!='.freeze => lambda { |cond, left, right| !cond.send(:equal_variables, left, right) },
-      '<>' => ->(cond, left, right) { !cond.send(:equal_variables, left, right) },
+      '<>'.freeze => lambda { |cond, left, right| !cond.send(:equal_variables, left, right) },
-      '<' => :<,
+      '<'.freeze  => :<,
-      '>' => :>,
+      '>'.freeze  => :>,
-      '>=' => :>=,
+      '>='.freeze => :>=,
-      '<=' => :<=,
+      '<='.freeze => :<=,
-      'contains' => lambda do |_cond, left, right|
+      'contains'.freeze => lambda { |cond, left, right| left && right ? left.include?(right) : false }
-        if left && right && left.respond_to?(:include?)
-          right = right.to_s if left.is_a?(String)
-          left.include?(right)
-        else
-          false
-        end
-      end,
     }
 
     def self.operators
       @@operators
     end
 
-    attr_reader :attachment, :child_condition
+    attr_reader :attachment
     attr_accessor :left, :operator, :right
 
     def initialize(left = nil, operator = nil, right = nil)
-      @left = left
+      @left, @operator, @right = left, operator, right
-      @operator = operator
+      @child_relation  = nil
-      @right = right
-      @child_relation = nil
       @child_condition = nil
     end
 
     def evaluate(context = Context.new)
-      condition = self
+      result = interpret_condition(left, right, operator, context)
-      result = nil
-      loop do
-        result = interpret_condition(condition.left, condition.right, condition.operator, context)
 
-        case condition.child_relation
+      case @child_relation
-        when :or
+      when :or
-          break if result
+        result || @child_condition.evaluate(context)
-        when :and
+      when :and
-          break unless result
+        result && @child_condition.evaluate(context)
-        else
+      else
-          break
+        result
-        end
-        condition = condition.child_condition
       end
-      result
     end
 
     def or(condition)
-      @child_relation = :or
+      @child_relation, @child_condition = :or, condition
-      @child_condition = condition
     end
 
     def and(condition)
-      @child_relation = :and
+      @child_relation, @child_condition = :and, condition
-      @child_condition = condition
     end
 
     def attach(attachment)
@@ -80,27 +61,23 @@ module Liquid
     end
 
     def inspect
-      "#<Condition #{[@left, @operator, @right].compact.join(' ')}>"
+      "#<Condition #{[@left, @operator, @right].compact.join(' '.freeze)}>"
     end
 
-    protected
-
-    attr_reader :child_relation
-
     private
 
     def equal_variables(left, right)
-      if left.is_a?(Liquid::Expression::MethodLiteral)
+      if left.is_a?(Symbol)
-        if right.respond_to?(left.method_name)
+        if right.respond_to?(left)
-          return right.send(left.method_name)
+          return right.send(left.to_s)
         else
           return nil
         end
       end
 
-      if right.is_a?(Liquid::Expression::MethodLiteral)
+      if right.is_a?(Symbol)
-        if left.respond_to?(right.method_name)
+        if left.respond_to?(right)
-          return left.send(right.method_name)
+          return left.send(right.to_s)
         else
           return nil
         end
@@ -113,41 +90,31 @@ module Liquid
       # If the operator is empty this means that the decision statement is just
       # a single variable. We can just poll this variable from the context and
       # return this as the result.
-      return context.evaluate(left) if op.nil?
+      return context[left] if op == nil
 
-      left = context.evaluate(left)
+      left, right = context[left], context[right]
-      right = context.evaluate(right)
 
-      operation = self.class.operators[op] || raise(Liquid::ArgumentError, "Unknown operator #{op}")
+      operation = self.class.operators[op] || raise(ArgumentError.new("Unknown operator #{op}"))
 
       if operation.respond_to?(:call)
         operation.call(self, left, right)
-      elsif left.respond_to?(operation) && right.respond_to?(operation) && !left.is_a?(Hash) && !right.is_a?(Hash)
+      elsif left.respond_to?(operation) and right.respond_to?(operation)
-        begin
+        left.send(operation, right)
-          left.send(operation, right)
+      else
-        rescue ::ArgumentError => e
+        nil
-          raise Liquid::ArgumentError, e.message
-        end
-      end
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        [
-          @node.left, @node.right,
-          @node.child_condition, @node.attachment
-        ].compact
       end
     end
   end
 
+
   class ElseCondition < Condition
     def else?
       true
     end
 
-    def evaluate(_context)
+    def evaluate(context)
       true
     end
   end
+
 end

lib/liquid/context.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # Context keeps the variable stack and resolves variables, as well as keywords
   #
   #   context['variable'] = 'testing'
@@ -14,41 +13,33 @@ module Liquid
   #
   #   context['bob']  #=> nil  class Context
   class Context
-    attr_reader :scopes, :errors, :registers, :environments, :resource_limits, :static_registers, :static_environments
+    attr_reader :scopes, :errors, :registers, :environments, :resource_limits
-    attr_accessor :exception_renderer, :template_name, :partial, :global_filter, :strict_variables, :strict_filters
 
-    # rubocop:disable Metrics/ParameterLists
+    def initialize(environments = {}, outer_scope = {}, registers = {}, rethrow_errors = false, resource_limits = {})
-    def self.build(environments: {}, outer_scope: {}, registers: {}, rethrow_errors: false, resource_limits: nil, static_environments: {})
+      @environments    = [environments].flatten
-      new(environments, outer_scope, registers, rethrow_errors, resource_limits, static_environments)
+      @scopes          = [(outer_scope || {})]
-    end
+      @registers       = registers
-
+      @errors          = []
-    def initialize(environments = {}, outer_scope = {}, registers = {}, rethrow_errors = false, resource_limits = nil, static_environments = {})
+      @rethrow_errors  = rethrow_errors
-      @environments = [environments]
+      @resource_limits = (resource_limits || {}).merge!({ :render_score_current => 0, :assign_score_current => 0 })
-      @environments.flatten!
-
-      @static_environments = [static_environments].flat_map(&:freeze).freeze
-      @scopes              = [(outer_scope || {})]
-      @registers           = registers
-      @errors              = []
-      @partial             = false
-      @strict_variables    = false
-      @resource_limits     = resource_limits || ResourceLimits.new(Template.default_resource_limits)
-      @base_scope_depth    = 0
       squash_instance_assigns_with_environments
 
-      self.exception_renderer = Template.default_exception_renderer
-      if rethrow_errors
-        self.exception_renderer = ->(_e) { raise }
-      end
-
       @interrupts = []
       @filters = []
-      @global_filter = nil
     end
-    # rubocop:enable Metrics/ParameterLists
 
-    def warnings
+    def increment_used_resources(key, obj)
-      @warnings ||= []
+      @resource_limits[key] += if obj.kind_of?(String) || obj.kind_of?(Array) || obj.kind_of?(Hash)
+        obj.length
+      else
+        1
+      end
+    end
+
+    def resource_limits_reached?
+      (@resource_limits[:render_length_limit] && @resource_limits[:render_length_current] > @resource_limits[:render_length_limit]) ||
+      (@resource_limits[:render_score_limit]  && @resource_limits[:render_score_current]  > @resource_limits[:render_score_limit] ) ||
+      (@resource_limits[:assign_score_limit]  && @resource_limits[:assign_score_current]  > @resource_limits[:assign_score_limit] )
     end
 
     def strainer
@@ -61,17 +52,26 @@ module Liquid
     # for that
     def add_filters(filters)
       filters = [filters].flatten.compact
-      @filters += filters
+      filters.each do |f|
-      @strainer = nil
+        raise ArgumentError, "Expected module but got: #{f.class}" unless f.is_a?(Module)
-    end
+        Strainer.add_known_filter(f)
+      end
 
-    def apply_global_filter(obj)
+      # If strainer is already setup then there's no choice but to use a runtime
-      global_filter.nil? ? obj : global_filter.call(obj)
+      # extend call. If strainer is not yet created, we can utilize strainers
+      # cached class based API, which avoids busting the method cache.
+      if @strainer
+        filters.each do |f|
+          strainer.extend(f)
+        end
+      else
+        @filters.concat filters
+      end
     end
 
     # are there any not handled interrupts?
-    def interrupt?
+    def has_interrupt?
-      !@interrupts.empty?
+      @interrupts.any?
     end
 
     # push an interrupt to the stack. this interrupt is considered not handled.
@@ -84,22 +84,26 @@ module Liquid
       @interrupts.pop
     end
 
-    def handle_error(e, line_number = nil)
+    def handle_error(e)
-      e = internal_error unless e.is_a?(Liquid::Error)
-      e.template_name ||= template_name
-      e.line_number ||= line_number
       errors.push(e)
-      exception_renderer.call(e).to_s
+      raise if @rethrow_errors
+
+      case e
+      when SyntaxError
+        "Liquid syntax error: #{e.message}"
+      else
+        "Liquid error: #{e.message}"
+      end
     end
 
     def invoke(method, *args)
-      strainer.invoke(method, *args).to_liquid
+      strainer.invoke(method, *args)
     end
 
     # Push new local scope on the stack. use <tt>Context#stack</tt> instead
-    def push(new_scope = {})
+    def push(new_scope={})
       @scopes.unshift(new_scope)
-      check_overflow
+      raise StackLevelError, "Nesting too deep".freeze if @scopes.length > 100
     end
 
     # Merge a hash of variables in the current local scope
@@ -121,32 +125,13 @@ module Liquid
     #   end
     #
     #   context['var]  #=> nil
-    def stack(new_scope = {})
+    def stack(new_scope={})
       push(new_scope)
       yield
     ensure
       pop
     end
 
-    # Creates a new context inheriting resource limits, filters, environment etc.,
-    # but with an isolated scope.
-    def new_isolated_subcontext
-      check_overflow
-
-      Context.build(
-        resource_limits: resource_limits,
-        static_environments: static_environments,
-        registers: StaticRegisters.new(registers)
-      ).tap do |subcontext|
-        subcontext.base_scope_depth = base_scope_depth + 1
-        subcontext.exception_renderer = exception_renderer
-        subcontext.filters = @filters
-        subcontext.strainer = nil
-        subcontext.errors = errors
-        subcontext.warnings = warnings
-      end
-    end
-
     def clear_instance_assigns
       @scopes[0] = {}
     end
@@ -156,106 +141,145 @@ module Liquid
       @scopes[0][key] = value
     end
 
-    # Look up variable, either resolve directly after considering the name. We can directly handle
+    def [](key)
-    # Strings, digits, floats and booleans (true,false).
+      resolve(key)
-    # If no match is made we lookup the variable in the current scope and
-    # later move up to the parent blocks to see if we can resolve the variable somewhere up the tree.
-    # Some special keywords return symbols. Those symbols are to be called on the rhs object in expressions
-    #
-    # Example:
-    #   products == empty #=> products.empty?
-    def [](expression)
-      evaluate(Expression.parse(expression))
     end
 
-    def key?(key)
+    def has_key?(key)
-      self[key] != nil
+      resolve(key) != nil
     end
 
-    def evaluate(object)
-      object.respond_to?(:evaluate) ? object.evaluate(self) : object
-    end
-
-    # Fetches an object starting at the local scope and then moving up the hierachy
-    def find_variable(key, raise_on_not_found: true)
-      # This was changed from find() to find_index() because this is a very hot
-      # path and find_index() is optimized in MRI to reduce object allocation
-      index = @scopes.find_index { |s| s.key?(key) }
-
-      variable = if index
-        lookup_and_evaluate(@scopes[index], key, raise_on_not_found: raise_on_not_found)
-      else
-        try_variable_find_in_environments(key, raise_on_not_found: raise_on_not_found)
-      end
-
-      variable = variable.to_liquid
-      variable.context = self if variable.respond_to?(:context=)
-
-      variable
-    end
-
-    def lookup_and_evaluate(obj, key, raise_on_not_found: true)
-      if @strict_variables && raise_on_not_found && obj.respond_to?(:key?) && !obj.key?(key)
-        raise Liquid::UndefinedVariable, "undefined variable #{key}"
-      end
-
-      value = obj[key]
-
-      if value.is_a?(Proc) && obj.respond_to?(:[]=)
-        obj[key] = value.arity == 0 ? value.call : value.call(self)
-      else
-        value
-      end
-    end
-
-    protected
-
-    attr_writer :base_scope_depth, :warnings, :errors, :strainer, :filters
-
     private
+      LITERALS = {
+        nil => nil, 'nil'.freeze => nil, 'null'.freeze => nil, ''.freeze => nil,
+        'true'.freeze  => true,
+        'false'.freeze => false,
+        'blank'.freeze => :blank?,
+        'empty'.freeze => :empty?
+      }
 
-    attr_reader :base_scope_depth
+      # Look up variable, either resolve directly after considering the name. We can directly handle
-
+      # Strings, digits, floats and booleans (true,false).
-    def try_variable_find_in_environments(key, raise_on_not_found:)
+      # If no match is made we lookup the variable in the current scope and
-      @environments.each do |environment|
+      # later move up to the parent blocks to see if we can resolve the variable somewhere up the tree.
-        found_variable = lookup_and_evaluate(environment, key, raise_on_not_found: raise_on_not_found)
+      # Some special keywords return symbols. Those symbols are to be called on the rhs object in expressions
-        if !found_variable.nil? || @strict_variables && raise_on_not_found
+      #
-          return found_variable
+      # Example:
-        end
+      #   products == empty #=> products.empty?
-      end
+      def resolve(key)
-      @static_environments.each do |environment|
+        if LITERALS.key?(key)
-        found_variable = lookup_and_evaluate(environment, key, raise_on_not_found: raise_on_not_found)
+          LITERALS[key]
-        if !found_variable.nil? || @strict_variables && raise_on_not_found
+        else
-          return found_variable
+          case key
-        end
+          when /\A'(.*)'\z/m # Single quoted strings
-      end
+            $1
-      nil
+          when /\A"(.*)"\z/m # Double quoted strings
-    end
+            $1
-
+          when /\A(-?\d+)\z/ # Integer and floats
-    def check_overflow
+            $1.to_i
-      raise StackLevelError, "Nesting too deep" if overflow?
+          when /\A\((\S+)\.\.(\S+)\)\z/ # Ranges
-    end
+            (resolve($1).to_i..resolve($2).to_i)
-
+          when /\A(-?\d[\d\.]+)\z/ # Floats
-    def overflow?
+            $1.to_f
-      base_scope_depth + @scopes.length > Block::MAX_DEPTH
+          else
-    end
+            variable(key)
-
-    def internal_error
-      # raise and catch to set backtrace and cause on exception
-      raise Liquid::InternalError, 'internal'
-    rescue Liquid::InternalError => exc
-      exc
-    end
-
-    def squash_instance_assigns_with_environments
-      @scopes.last.each_key do |k|
-        @environments.each do |env|
-          if env.key?(k)
-            scopes.last[k] = lookup_and_evaluate(env, k)
-            break
           end
         end
       end
-    end # squash_instance_assigns_with_environments
+
+      # Fetches an object starting at the local scope and then moving up the hierachy
+      def find_variable(key)
+        scope = @scopes.find { |s| s.has_key?(key) }
+        variable = nil
+
+        if scope.nil?
+          @environments.each do |e|
+            if variable = lookup_and_evaluate(e, key)
+              scope = e
+              break
+            end
+          end
+        end
+
+        scope     ||= @environments.last || @scopes.last
+        variable  ||= lookup_and_evaluate(scope, key)
+
+        variable = variable.to_liquid
+        variable.context = self if variable.respond_to?(:context=)
+
+        return variable
+      end
+
+      # Resolves namespaced queries gracefully.
+      #
+      # Example
+      #  @context['hash'] = {"name" => 'tobi'}
+      #  assert_equal 'tobi', @context['hash.name']
+      #  assert_equal 'tobi', @context['hash["name"]']
+      def variable(markup)
+        parts = markup.scan(VariableParser)
+        square_bracketed = /\A\[(.*)\]\z/m
+
+        first_part = parts.shift
+
+        if first_part =~ square_bracketed
+          first_part = resolve($1)
+        end
+
+        if object = find_variable(first_part)
+
+          parts.each do |part|
+            part = resolve($1) if part_resolved = (part =~ square_bracketed)
+
+            # If object is a hash- or array-like object we look for the
+            # presence of the key and if its available we return it
+            if object.respond_to?(:[]) and
+              ((object.respond_to?(:has_key?) and object.has_key?(part)) or
+               (object.respond_to?(:fetch) and part.is_a?(Integer)))
+
+              # if its a proc we will replace the entry with the proc
+              res = lookup_and_evaluate(object, part)
+              object = res.to_liquid
+
+              # Some special cases. If the part wasn't in square brackets and
+              # no key with the same name was found we interpret following calls
+              # as commands and call them on the current object
+            elsif !part_resolved and object.respond_to?(part) and ['size'.freeze, 'first'.freeze, 'last'.freeze].include?(part)
+
+              object = object.send(part.intern).to_liquid
+
+              # No key was present with the desired value and it wasn't one of the directly supported
+              # keywords either. The only thing we got left is to return nil
+            else
+              return nil
+            end
+
+            # If we are dealing with a drop here we have to
+            object.context = self if object.respond_to?(:context=)
+          end
+        end
+
+        object
+      end # variable
+
+      def lookup_and_evaluate(obj, key)
+        if (value = obj[key]).is_a?(Proc) && obj.respond_to?(:[]=)
+          obj[key] = (value.arity == 0) ? value.call : value.call(self)
+        else
+          value
+        end
+      end # lookup_and_evaluate
+
+      def squash_instance_assigns_with_environments
+        @scopes.last.each_key do |k|
+          @environments.each do |env|
+            if env.has_key?(k)
+              scopes.last[k] = lookup_and_evaluate(env, k)
+              break
+            end
+          end
+        end
+      end # squash_instance_assigns_with_environments
   end # Context
+
 end # Liquid

lib/liquid/document.rb

@@ -1,29 +1,17 @@
-# frozen_string_literal: true
-
 module Liquid
-  class Document < BlockBody
+  class Document < Block
-    def self.parse(tokens, parse_context)
+    def self.parse(tokens, options={})
-      doc = new
+      # we don't need markup to open this block
-      doc.parse(tokens, parse_context)
+      super(nil, nil, tokens, options)
-      doc
     end
 
-    def parse(tokens, parse_context)
+    # There isn't a real delimiter
-      super do |end_tag_name, _end_tag_params|
+    def block_delimiter
-        unknown_tag(end_tag_name, parse_context) if end_tag_name
+      []
-      end
-    rescue SyntaxError => e
-      e.line_number ||= parse_context.line_number
-      raise
     end
 
-    def unknown_tag(tag, parse_context)
+    # Document blocks don't need to be terminated since they are not actually opened
-      case tag
+    def assert_missing_delimitation!
-      when 'else', 'end'
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_outer_tag", tag: tag)
-      else
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag", tag: tag)
-      end
     end
   end
 end

lib/liquid/drop.rb

@@ -1,8 +1,7 @@
-# frozen_string_literal: true
-
 require 'set'
 
 module Liquid
+
   # A drop in liquid is a class which allows you to export DOM like things to liquid.
   # Methods of drops are callable.
   # The main use for liquid drops is to implement lazy loaded objects.
@@ -20,27 +19,28 @@ module Liquid
   #   tmpl = Liquid::Template.parse( ' {% for product in product.top_sales %} {{ product.name }} {%endfor%} '  )
   #   tmpl.render('product' => ProductDrop.new ) # will invoke top_sales query.
   #
-  # Your drop can either implement the methods sans any parameters
+  # Your drop can either implement the methods sans any parameters or implement the before_method(name) method which is a
-  # or implement the liquid_method_missing(name) method which is a catch all.
+  # catch all.
   class Drop
     attr_writer :context
 
+    EMPTY_STRING = ''.freeze
+
     # Catch all for the method
-    def liquid_method_missing(method)
+    def before_method(method)
-      return nil unless @context&.strict_variables
+      nil
-      raise Liquid::UndefinedDropMethod, "undefined method #{method}"
     end
 
     # called by liquid to invoke a drop
     def invoke_drop(method_or_key)
-      if self.class.invokable?(method_or_key)
+      if method_or_key && method_or_key != EMPTY_STRING && self.class.invokable?(method_or_key)
         send(method_or_key)
       else
-        liquid_method_missing(method_or_key)
+        before_method(method_or_key)
       end
     end
 
-    def key?(_name)
+    def has_key?(name)
       true
     end
 
@@ -56,25 +56,22 @@ module Liquid
       self.class.name
     end
 
-    alias_method :[], :invoke_drop
+    alias :[] :invoke_drop
+
+    private
 
     # Check for method existence without invoking respond_to?, which creates symbols
     def self.invokable?(method_name)
-      invokable_methods.include?(method_name.to_s)
+      unless @invokable_methods
-    end
-
-    def self.invokable_methods
-      @invokable_methods ||= begin
         blacklist = Liquid::Drop.public_instance_methods + [:each]
-
         if include?(Enumerable)
           blacklist += Enumerable.public_instance_methods
-          blacklist -= [:sort, :count, :first, :min, :max]
+          blacklist -= [:sort, :count, :first, :min, :max, :include?]
         end
-
         whitelist = [:to_liquid] + (public_instance_methods - blacklist)
-        Set.new(whitelist.map(&:to_s))
+        @invokable_methods = Set.new(whitelist.map(&:to_s))
       end
+      @invokable_methods.include?(method_name.to_s)
     end
   end
 end

lib/liquid/errors.rb

@@ -1,58 +1,12 @@
-# frozen_string_literal: true
-
 module Liquid
-  class Error < ::StandardError
+  class Error < ::StandardError; end
-    attr_accessor :line_number
-    attr_accessor :template_name
-    attr_accessor :markup_context
 
-    def to_s(with_prefix = true)
+  class ArgumentError < Error; end
-      str = +""
+  class ContextError < Error; end
-      str << message_prefix if with_prefix
+  class FilterNotFound < Error; end
-      str << super()
+  class FileSystemError < Error; end
-
+  class StandardError < Error; end
-      if markup_context
+  class SyntaxError < Error; end
-        str << " "
+  class StackLevelError < Error; end
-        str << markup_context
+  class MemoryError < Error; end
-      end
-
-      str
-    end
-
-    private
-
-    def message_prefix
-      str = +""
-      str << if is_a?(SyntaxError)
-        "Liquid syntax error"
-      else
-        "Liquid error"
-      end
-
-      if line_number
-        str << " ("
-        str << template_name << " " if template_name
-        str << "line " << line_number.to_s << ")"
-      end
-
-      str << ": "
-      str
-    end
-  end
-
-  ArgumentError = Class.new(Error)
-  ContextError = Class.new(Error)
-  FileSystemError = Class.new(Error)
-  StandardError = Class.new(Error)
-  SyntaxError = Class.new(Error)
-  StackLevelError = Class.new(Error)
-  TaintedError = Class.new(Error)
-  MemoryError = Class.new(Error)
-  ZeroDivisionError = Class.new(Error)
-  FloatDomainError = Class.new(Error)
-  UndefinedVariable = Class.new(Error)
-  UndefinedDropMethod = Class.new(Error)
-  UndefinedFilter = Class.new(Error)
-  MethodOverrideError = Class.new(Error)
-  InternalError = Class.new(Error)
 end

lib/liquid/expression.rb

@@ -1,51 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Expression
-    class MethodLiteral
-      attr_reader :method_name, :to_s
-
-      def initialize(method_name, to_s)
-        @method_name = method_name
-        @to_s = to_s
-      end
-
-      def to_liquid
-        to_s
-      end
-    end
-
-    LITERALS = {
-      nil => nil, 'nil' => nil, 'null' => nil, '' => nil,
-      'true' => true,
-      'false' => false,
-      'blank' => MethodLiteral.new(:blank?, '').freeze,
-      'empty' => MethodLiteral.new(:empty?, '').freeze
-    }.freeze
-
-    SINGLE_QUOTED_STRING = /\A'(.*)'\z/m
-    DOUBLE_QUOTED_STRING = /\A"(.*)"\z/m
-    INTEGERS_REGEX       = /\A(-?\d+)\z/
-    FLOATS_REGEX         = /\A(-?\d[\d\.]+)\z/
-    RANGES_REGEX         = /\A\((\S+)\.\.(\S+)\)\z/
-
-    def self.parse(markup)
-      if LITERALS.key?(markup)
-        LITERALS[markup]
-      else
-        case markup
-        when SINGLE_QUOTED_STRING, DOUBLE_QUOTED_STRING
-          Regexp.last_match(1)
-        when INTEGERS_REGEX
-          Regexp.last_match(1).to_i
-        when RANGES_REGEX
-          RangeLookup.parse(Regexp.last_match(1), Regexp.last_match(2))
-        when FLOATS_REGEX
-          Regexp.last_match(1).to_f
-        else
-          VariableLookup.parse(markup)
-        end
-      end
-    end
-  end
-end

lib/liquid/extensions.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'time'
 require 'date'
 
@@ -9,56 +7,44 @@ class String # :nodoc:
   end
 end
 
-class Symbol # :nodoc:
+class Array  # :nodoc:
-  def to_liquid
-    to_s
-  end
-end
-
-class Array # :nodoc:
   def to_liquid
     self
   end
 end
 
-class Hash # :nodoc:
+class Hash  # :nodoc:
   def to_liquid
     self
   end
 end
 
-class Numeric # :nodoc:
+class Numeric  # :nodoc:
   def to_liquid
     self
   end
 end
 
-class Range # :nodoc:
+class Time  # :nodoc:
   def to_liquid
     self
   end
 end
 
-class Time # :nodoc:
+class DateTime < Date  # :nodoc:
   def to_liquid
     self
   end
 end
 
-class DateTime < Date # :nodoc:
+class Date  # :nodoc:
-  def to_liquid
-    self
-  end
-end
-
-class Date # :nodoc:
   def to_liquid
     self
   end
 end
 
 class TrueClass
-  def to_liquid # :nodoc:
+  def to_liquid  # :nodoc:
     self
   end
 end

lib/liquid/file_system.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # A Liquid file system is a way to let your templates retrieve other templates for use with the include tag.
   #
@@ -10,13 +8,13 @@ module Liquid
   #
   # Example:
   #
-  #   Liquid::Template.file_system = Liquid::LocalFileSystem.new(template_path)
+  # Liquid::Template.file_system = Liquid::LocalFileSystem.new(template_path)
-  #   liquid = Liquid::Template.parse(template)
+  # liquid = Liquid::Template.parse(template)
   #
   # This will parse the template with a LocalFileSystem implementation rooted at 'template_path'.
   class BlankFileSystem
     # Called by Liquid to retrieve a template file
-    def read_template_file(_template_path)
+    def read_template_file(template_path, context)
       raise FileSystemError, "This liquid context does not allow includes."
     end
   end
@@ -28,10 +26,10 @@ module Liquid
   #
   # Example:
   #
-  #   file_system = Liquid::LocalFileSystem.new("/some/path")
+  # file_system = Liquid::LocalFileSystem.new("/some/path")
   #
-  #   file_system.full_path("mypartial")       # => "/some/path/_mypartial.liquid"
+  # file_system.full_path("mypartial")       # => "/some/path/_mypartial.liquid"
-  #   file_system.full_path("dir/mypartial")   # => "/some/path/dir/_mypartial.liquid"
+  # file_system.full_path("dir/mypartial")   # => "/some/path/dir/_mypartial.liquid"
   #
   # Optionally in the second argument you can specify a custom pattern for template filenames.
   # The Kernel::sprintf format specification is used.
@@ -39,35 +37,35 @@ module Liquid
   #
   # Example:
   #
-  #   file_system = Liquid::LocalFileSystem.new("/some/path", "%s.html")
+  # file_system = Liquid::LocalFileSystem.new("/some/path", "%s.html")
   #
-  #   file_system.full_path("index") # => "/some/path/index.html"
+  # file_system.full_path("index") # => "/some/path/index.html"
   #
   class LocalFileSystem
     attr_accessor :root
 
-    def initialize(root, pattern = "_%s.liquid")
+    def initialize(root, pattern = "_%s.liquid".freeze)
       @root = root
       @pattern = pattern
     end
 
-    def read_template_file(template_path)
+    def read_template_file(template_path, context)
       full_path = full_path(template_path)
-      raise FileSystemError, "No such template '#{template_path}'" unless File.exist?(full_path)
+      raise FileSystemError, "No such template '#{template_path}'" unless File.exists?(full_path)
 
       File.read(full_path)
     end
 
     def full_path(template_path)
-      raise FileSystemError, "Illegal template name '#{template_path}'" unless %r{\A[^./][a-zA-Z0-9_/]+\z}.match?(template_path)
+      raise FileSystemError, "Illegal template name '#{template_path}'" unless template_path =~ /\A[^.\/][a-zA-Z0-9_\/]+\z/
 
-      full_path = if template_path.include?('/')
+      full_path = if template_path.include?('/'.freeze)
         File.join(root, File.dirname(template_path), @pattern % File.basename(template_path))
       else
         File.join(root, @pattern % template_path)
       end
 
-      raise FileSystemError, "Illegal template path '#{File.expand_path(full_path)}'" unless File.expand_path(full_path).start_with?(File.expand_path(root))
+      raise FileSystemError, "Illegal template path '#{File.expand_path(full_path)}'" unless File.expand_path(full_path) =~ /\A#{File.expand_path(root)}/
 
       full_path
     end

lib/liquid/forloop_drop.rb

@@ -1,44 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class ForloopDrop < Drop
-    def initialize(name, length, parentloop)
-      @name = name
-      @length = length
-      @parentloop = parentloop
-      @index = 0
-    end
-
-    attr_reader :name, :length, :parentloop
-
-    def index
-      @index + 1
-    end
-
-    def index0
-      @index
-    end
-
-    def rindex
-      @length - @index
-    end
-
-    def rindex0
-      @length - @index - 1
-    end
-
-    def first
-      @index == 0
-    end
-
-    def last
-      @index == @length - 1
-    end
-
-    protected
-
-    def increment!
-      @index += 1
-    end
-  end
-end

lib/liquid/i18n.rb

@@ -1,12 +1,11 @@
-# frozen_string_literal: true
-
 require 'yaml'
 
 module Liquid
   class I18n
-    DEFAULT_LOCALE = File.join(File.expand_path(__dir__), "locales", "en.yml")
+    DEFAULT_LOCALE = File.join(File.expand_path(File.dirname(__FILE__)), "locales", "en.yml")
 
-    TranslationError = Class.new(StandardError)
+    class TranslationError < StandardError
+    end
 
     attr_reader :path
 
@@ -24,17 +23,16 @@ module Liquid
     end
 
     private
-
     def interpolate(name, vars)
-      name.gsub(/%\{(\w+)\}/) do
+      name.gsub(/%\{(\w+)\}/) {
         # raise TranslationError, "Undefined key #{$1} for interpolation in translation #{name}"  unless vars[$1.to_sym]
-        (vars[Regexp.last_match(1).to_sym]).to_s
+        "#{vars[$1.to_sym]}"
-      end
+      }
     end
 
     def deep_fetch_translation(name)
-      name.split('.').reduce(locale) do |level, cur|
+      name.split('.'.freeze).reduce(locale) do |level, cur|
-        level[cur] || raise(TranslationError, "Translation for #{name} does not exist in locale #{path}")
+        level[cur] or raise TranslationError, "Translation for #{name} does not exist in locale #{path}"
       end
     end
   end

lib/liquid/interrupts.rb

@@ -1,12 +1,11 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # An interrupt is any command that breaks processing of a block (ex: a for loop).
   class Interrupt
     attr_reader :message
 
-    def initialize(message = nil)
+    def initialize(message=nil)
-      @message = message || "interrupt"
+      @message = message || "interrupt".freeze
     end
   end
 

lib/liquid/lexer.rb

@@ -1,54 +1,43 @@
-# frozen_string_literal: true
-
 require "strscan"
 module Liquid
   class Lexer
     SPECIALS = {
-      '|' => :pipe,
+      '|'.freeze => :pipe,
-      '.' => :dot,
+      '.'.freeze => :dot,
-      ':' => :colon,
+      ':'.freeze => :colon,
-      ',' => :comma,
+      ','.freeze => :comma,
-      '[' => :open_square,
+      '['.freeze => :open_square,
-      ']' => :close_square,
+      ']'.freeze => :close_square,
-      '(' => :open_round,
+      '('.freeze => :open_round,
-      ')' => :close_round,
+      ')'.freeze => :close_round
-      '?' => :question,
+    }
-      '-' => :dash,
+    IDENTIFIER = /[\w\-?!]+/
-    }.freeze
-    IDENTIFIER = /[a-zA-Z_][\w-]*\??/
     SINGLE_STRING_LITERAL = /'[^\']*'/
     DOUBLE_STRING_LITERAL = /"[^\"]*"/
     NUMBER_LITERAL = /-?\d+(\.\d+)?/
     DOTDOT = /\.\./
-    COMPARISON_OPERATOR = /==|!=|<>|<=?|>=?|contains(?=\s)/
+    COMPARISON_OPERATOR = /==|!=|<>|<=?|>=?|contains/
-    WHITESPACE_OR_NOTHING = /\s*/
 
     def initialize(input)
-      @ss = StringScanner.new(input)
+      @ss = StringScanner.new(input.rstrip)
     end
 
     def tokenize
       @output = []
 
-      until @ss.eos?
+      while !@ss.eos?
-        @ss.skip(WHITESPACE_OR_NOTHING)
+        @ss.skip(/\s*/)
-        break if @ss.eos?
+        tok = case
-        tok = if (t = @ss.scan(COMPARISON_OPERATOR))
+        when t = @ss.scan(COMPARISON_OPERATOR) then [:comparison, t]
-          [:comparison, t]
+        when t = @ss.scan(SINGLE_STRING_LITERAL) then [:string, t]
-        elsif (t = @ss.scan(SINGLE_STRING_LITERAL))
+        when t = @ss.scan(DOUBLE_STRING_LITERAL) then [:string, t]
-          [:string, t]
+        when t = @ss.scan(NUMBER_LITERAL) then [:number, t]
-        elsif (t = @ss.scan(DOUBLE_STRING_LITERAL))
+        when t = @ss.scan(IDENTIFIER) then [:id, t]
-          [:string, t]
+        when t = @ss.scan(DOTDOT) then [:dotdot, t]
-        elsif (t = @ss.scan(NUMBER_LITERAL))
-          [:number, t]
-        elsif (t = @ss.scan(IDENTIFIER))
-          [:id, t]
-        elsif (t = @ss.scan(DOTDOT))
-          [:dotdot, t]
         else
           c = @ss.getch
-          if (s = SPECIALS[c])
+          if s = SPECIALS[c]
-            [s, c]
+            [s,c]
           else
             raise SyntaxError, "Unexpected character #{c}"
           end

lib/liquid/locales/en.yml

@@ -1,7 +1,6 @@
 ---
   errors:
     syntax:
-      tag_unexpected_args: "Syntax Error in '%{tag}' - Valid syntax: %{tag}"
       assign: "Syntax Error in 'assign' - Valid syntax: assign [var] = [source]"
       capture: "Syntax Error in 'capture' - Valid syntax: capture [var]"
       case: "Syntax Error in 'case' - Valid syntax: case [condition]"
@@ -14,16 +13,10 @@
       if: "Syntax Error in tag 'if' - Valid syntax: if [expression]"
       include: "Error in tag 'include' - Valid syntax: include '[template]' (with|for) [object|collection]"
       unknown_tag: "Unknown tag '%{tag}'"
-      invalid_delimiter: "'%{tag}' is not a valid delimiter for %{block_name} tags. use %{block_delimiter}"
+      invalid_delimiter: "'end' is not a valid delimiter for %{block_name} tags. use %{block_delimiter}"
-      unexpected_else: "%{block_name} tag does not expect 'else' tag"
+      unexpected_else: "%{block_name} tag does not expect else tag"
-      unexpected_outer_tag: "Unexpected outer '%{tag}' tag"
       tag_termination: "Tag '%{token}' was not properly terminated with regexp: %{tag_end}"
       variable_termination: "Variable '%{token}' was not properly terminated with regexp: %{tag_end}"
       tag_never_closed: "'%{block_name}' tag was never closed"
       meta_syntax_error: "Liquid syntax error: #{e.message}"
       table_row: "Syntax Error in 'table_row loop' - Valid syntax: table_row [item] in [collection] cols=3"
-      render: "Syntax error in tag 'render' - Template name must be a quoted string"
-    argument:
-      include: "Argument error in tag 'include' - Illegal template name"
-    disabled:
-      tag: "usage is not allowed in this context"

lib/liquid/module_ex.rb

@@ -0,0 +1,62 @@
+# Copyright 2007 by Domizio Demichelis
+# This library is free software. It may be used, redistributed and/or modified
+# under the same terms as Ruby itself
+#
+# This extension is used in order to expose the object of the implementing class
+# to liquid as it were a Drop. It also limits the liquid-callable methods of the instance
+# to the allowed method passed with the liquid_methods call
+# Example:
+#
+# class SomeClass
+#   liquid_methods :an_allowed_method
+#
+#   def an_allowed_method
+#     'this comes from an allowed method'
+#   end
+#   def unallowed_method
+#     'this will never be an output'
+#   end
+# end
+#
+# if you want to extend the drop to other methods you can defines more methods
+# in the class <YourClass>::LiquidDropClass
+#
+#   class SomeClass::LiquidDropClass
+#     def another_allowed_method
+#       'and this from another allowed method'
+#     end
+#   end
+# end
+#
+# usage:
+# @something = SomeClass.new
+#
+# template:
+# {{something.an_allowed_method}}{{something.unallowed_method}} {{something.another_allowed_method}}
+#
+# output:
+# 'this comes from an allowed method and this from another allowed method'
+#
+# You can also chain associations, by adding the liquid_method call in the
+# association models.
+#
+class Module
+
+  def liquid_methods(*allowed_methods)
+    drop_class = eval "class #{self.to_s}::LiquidDropClass < Liquid::Drop; self; end"
+    define_method :to_liquid do
+      drop_class.new(self)
+    end
+    drop_class.class_eval do
+      def initialize(object)
+        @object = object
+      end
+      allowed_methods.each do |sym|
+        define_method sym do
+          @object.send sym
+        end
+      end
+    end
+  end
+
+end

lib/liquid/parse_context.rb

@@ -1,39 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class ParseContext
-    attr_accessor :locale, :line_number, :trim_whitespace, :depth
-    attr_reader :partial, :warnings, :error_mode
-
-    def initialize(options = {})
-      @template_options = options ? options.dup : {}
-      @locale = @template_options[:locale] ||= I18n.new
-      @warnings = []
-      self.depth = 0
-      self.partial = false
-    end
-
-    def [](option_key)
-      @options[option_key]
-    end
-
-    def partial=(value)
-      @partial = value
-      @options = value ? partial_options : @template_options
-      @error_mode = @options[:error_mode] || Template.error_mode
-    end
-
-    def partial_options
-      @partial_options ||= begin
-        dont_pass = @template_options[:include_options_blacklist]
-        if dont_pass == true
-          { locale: locale }
-        elsif dont_pass.is_a?(Array)
-          @template_options.reject { |k, _v| dont_pass.include?(k) }
-        else
-          @template_options
-        end
-      end
-    end
-  end
-end

lib/liquid/parse_tree_visitor.rb

@@ -1,42 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class ParseTreeVisitor
-    def self.for(node, callbacks = Hash.new(proc {}))
-      if defined?(node.class::ParseTreeVisitor)
-        node.class::ParseTreeVisitor
-      else
-        self
-      end.new(node, callbacks)
-    end
-
-    def initialize(node, callbacks)
-      @node = node
-      @callbacks = callbacks
-    end
-
-    def add_callback_for(*classes, &block)
-      callback = block
-      callback = ->(node, _) { yield node } if block.arity.abs == 1
-      callback = ->(_, _) { yield } if block.arity.zero?
-      classes.each { |klass| @callbacks[klass] = callback }
-      self
-    end
-
-    def visit(context = nil)
-      children.map do |node|
-        item, new_context = @callbacks[node.class].call(node, context)
-        [
-          item,
-          ParseTreeVisitor.for(node, @callbacks).visit(new_context || context),
-        ]
-      end
-    end
-
-    protected
-
-    def children
-      @node.respond_to?(:nodelist) ? Array(@node.nodelist) : []
-    end
-  end
-end

lib/liquid/parser.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Parser
     def initialize(input)
@@ -46,14 +44,11 @@ module Liquid
       tok[0] == type
     end
 
-    SINGLE_TOKEN_EXPRESSION_TYPES = [:string, :number].freeze
-    private_constant :SINGLE_TOKEN_EXPRESSION_TYPES
-
     def expression
       token = @tokens[@p]
       if token[0] == :id
         variable_signature
-      elsif SINGLE_TOKEN_EXPRESSION_TYPES.include?(token[0])
+      elsif [:string, :number].include? token[0]
         consume
       elsif token.first == :open_round
         consume
@@ -68,10 +63,10 @@ module Liquid
     end
 
     def argument
-      str = +""
+      str = ""
       # might be a keyword argument (identifier: expression)
       if look(:id) && look(:colon, 1)
-        str << consume << consume << ' '
+        str << consume << consume << ' '.freeze
       end
 
       str << expression
@@ -80,7 +75,7 @@ module Liquid
 
     def variable_signature
       str = consume(:id)
-      while look(:open_square)
+      if look(:open_square)
         str << consume
         str << expression
         str << consume(:close_square)

lib/liquid/parser_switching.rb

@@ -1,33 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  module ParserSwitching
-    def parse_with_selected_parser(markup)
-      case parse_context.error_mode
-      when :strict then strict_parse_with_error_context(markup)
-      when :lax    then lax_parse(markup)
-      when :warn
-        begin
-          return strict_parse_with_error_context(markup)
-        rescue SyntaxError => e
-          parse_context.warnings << e
-          return lax_parse(markup)
-        end
-      end
-    end
-
-    private
-
-    def strict_parse_with_error_context(markup)
-      strict_parse(markup)
-    rescue SyntaxError => e
-      e.line_number = line_number
-      e.markup_context = markup_context(markup)
-      raise e
-    end
-
-    def markup_context(markup)
-      "in \"#{markup.strip}\""
-    end
-  end
-end

lib/liquid/partial_cache.rb

@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class PartialCache
-    def self.load(template_name, context:, parse_context:)
-      cached_partials = (context.registers[:cached_partials] ||= {})
-      cached = cached_partials[template_name]
-      return cached if cached
-
-      file_system = (context.registers[:file_system] ||= Liquid::Template.file_system)
-      source = file_system.read_template_file(template_name)
-      parse_context.partial = true
-
-      partial = Liquid::Template.parse(source, parse_context)
-      cached_partials[template_name] = partial
-    ensure
-      parse_context.partial = false
-    end
-  end
-end

lib/liquid/profiler.rb

@@ -1,171 +0,0 @@
-# frozen_string_literal: true
-
-require 'liquid/profiler/hooks'
-
-module Liquid
-  # Profiler enables support for profiling template rendering to help track down performance issues.
-  #
-  # To enable profiling, first require 'liquid/profiler'.
-  # Then, to profile a parse/render cycle, pass the <tt>profile: true</tt> option to <tt>Liquid::Template.parse</tt>.
-  # After <tt>Liquid::Template#render</tt> is called, the template object makes available an instance of this
-  # class via the <tt>Liquid::Template#profiler</tt> method.
-  #
-  #   template = Liquid::Template.parse(template_content, profile: true)
-  #   output  = template.render
-  #   profile = template.profiler
-  #
-  # This object contains all profiling information, containing information on what tags were rendered,
-  # where in the templates these tags live, and how long each tag took to render.
-  #
-  # This is a tree structure that is Enumerable all the way down, and keeps track of tags and rendering times
-  # inside of <tt>{% include %}</tt> tags.
-  #
-  #   profile.each do |node|
-  #     # Access to the node itself
-  #     node.code
-  #
-  #     # Which template and line number of this node.
-  #     # If top level, this will be "<root>".
-  #     node.partial
-  #     node.line_number
-  #
-  #     # Render time in seconds of this node
-  #     node.render_time
-  #
-  #     # If the template used {% include %}, this node will also have children.
-  #     node.children.each do |child2|
-  #       # ...
-  #     end
-  #   end
-  #
-  # Profiler also exposes the total time of the template's render in <tt>Liquid::Profiler#total_render_time</tt>.
-  #
-  # All render times are in seconds. There is a small performance hit when profiling is enabled.
-  #
-  class Profiler
-    include Enumerable
-
-    class Timing
-      attr_reader :code, :partial, :line_number, :children, :total_time, :self_time
-
-      def initialize(node, partial)
-        @code        = node.respond_to?(:raw) ? node.raw : node
-        @partial     = partial
-        @line_number = node.respond_to?(:line_number) ? node.line_number : nil
-        @children    = []
-      end
-
-      def self.start(node, partial)
-        new(node, partial).tap(&:start)
-      end
-
-      def start
-        @start_time = Time.now
-      end
-
-      def finish
-        @end_time = Time.now
-        @total_time = @end_time - @start_time
-
-        if @children.empty?
-          @self_time = @total_time
-        else
-          total_children_time = 0
-          @children.each do |child|
-            total_children_time += child.total_time
-          end
-          @self_time = @total_time - total_children_time
-        end
-      end
-
-      def render_time
-        @end_time - @start_time
-      end
-    end
-
-    def self.profile_node_render(node)
-      if Profiler.current_profile && node.respond_to?(:render)
-        Profiler.current_profile.start_node(node)
-        output = yield
-        Profiler.current_profile.end_node(node)
-        output
-      else
-        yield
-      end
-    end
-
-    def self.profile_children(template_name)
-      if Profiler.current_profile
-        Profiler.current_profile.push_partial(template_name)
-        output = yield
-        Profiler.current_profile.pop_partial
-        output
-      else
-        yield
-      end
-    end
-
-    def self.current_profile
-      Thread.current[:liquid_profiler]
-    end
-
-    def initialize(partial_name = "<root>")
-      @partial_stack = [partial_name]
-
-      @root_timing = Timing.new("", current_partial)
-      @timing_stack = [@root_timing]
-
-      @render_start_at = Time.now
-      @render_end_at = @render_start_at
-    end
-
-    def start
-      Thread.current[:liquid_profiler] = self
-      @render_start_at = Time.now
-    end
-
-    def stop
-      Thread.current[:liquid_profiler] = nil
-      @render_end_at = Time.now
-    end
-
-    def total_render_time
-      @render_end_at - @render_start_at
-    end
-
-    def each(&block)
-      @root_timing.children.each(&block)
-    end
-
-    def [](idx)
-      @root_timing.children[idx]
-    end
-
-    def length
-      @root_timing.children.length
-    end
-
-    def start_node(node)
-      @timing_stack.push(Timing.start(node, current_partial))
-    end
-
-    def end_node(_node)
-      timing = @timing_stack.pop
-      timing.finish
-
-      @timing_stack.last.children << timing
-    end
-
-    def current_partial
-      @partial_stack.last
-    end
-
-    def push_partial(partial_name)
-      @partial_stack.push(partial_name)
-    end
-
-    def pop_partial
-      @partial_stack.pop
-    end
-  end
-end

lib/liquid/profiler/hooks.rb

@@ -1,25 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class BlockBody
-    def render_node_with_profiling(context, output, node)
-      Profiler.profile_node_render(node) do
-        render_node_without_profiling(context, output, node)
-      end
-    end
-
-    alias_method :render_node_without_profiling, :render_node
-    alias_method :render_node, :render_node_with_profiling
-  end
-
-  class Include < Tag
-    def render_to_output_buffer_with_profiling(context, output)
-      Profiler.profile_children(context.evaluate(@template_name_expr).to_s) do
-        render_to_output_buffer_without_profiling(context, output)
-      end
-    end
-
-    alias_method :render_to_output_buffer_without_profiling, :render_to_output_buffer
-    alias_method :render_to_output_buffer, :render_to_output_buffer_with_profiling
-  end
-end

lib/liquid/range_lookup.rb

@@ -1,39 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class RangeLookup
-    def self.parse(start_markup, end_markup)
-      start_obj = Expression.parse(start_markup)
-      end_obj = Expression.parse(end_markup)
-      if start_obj.respond_to?(:evaluate) || end_obj.respond_to?(:evaluate)
-        new(start_obj, end_obj)
-      else
-        start_obj.to_i..end_obj.to_i
-      end
-    end
-
-    def initialize(start_obj, end_obj)
-      @start_obj = start_obj
-      @end_obj = end_obj
-    end
-
-    def evaluate(context)
-      start_int = to_integer(context.evaluate(@start_obj))
-      end_int = to_integer(context.evaluate(@end_obj))
-      start_int..end_int
-    end
-
-    private
-
-    def to_integer(input)
-      case input
-      when Integer
-        input
-      when NilClass, String
-        input.to_i
-      else
-        Utils.to_integer(input)
-      end
-    end
-  end
-end

lib/liquid/register.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Register
-  end
-end

lib/liquid/registers/disabled_tags.rb

@@ -1,32 +0,0 @@
-# frozen_string_literal: true
-module Liquid
-  class DisabledTags < Register
-    def initialize
-      @disabled_tags = {}
-    end
-
-    def disabled?(tag)
-      @disabled_tags.key?(tag) && @disabled_tags[tag] > 0
-    end
-
-    def disable(tags)
-      tags.each(&method(:increment))
-      yield
-    ensure
-      tags.each(&method(:decrement))
-    end
-
-    private
-
-    def increment(tag)
-      @disabled_tags[tag] ||= 0
-      @disabled_tags[tag] += 1
-    end
-
-    def decrement(tag)
-      @disabled_tags[tag] -= 1
-    end
-  end
-
-  Template.add_register(:disabled_tags, DisabledTags.new)
-end

lib/liquid/resource_limits.rb

@@ -1,25 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class ResourceLimits
-    attr_accessor :render_length, :render_score, :assign_score,
-      :render_length_limit, :render_score_limit, :assign_score_limit
-
-    def initialize(limits)
-      @render_length_limit = limits[:render_length_limit]
-      @render_score_limit = limits[:render_score_limit]
-      @assign_score_limit = limits[:assign_score_limit]
-      reset
-    end
-
-    def reached?
-      (@render_length_limit && @render_length > @render_length_limit) ||
-        (@render_score_limit && @render_score > @render_score_limit) ||
-        (@assign_score_limit && @assign_score > @assign_score_limit)
-    end
-
-    def reset
-      @render_length = @render_score = @assign_score = 0
-    end
-  end
-end

lib/liquid/standardfilters.rb

@@ -1,24 +1,17 @@
-# frozen_string_literal: true
-
 require 'cgi'
 require 'bigdecimal'
 
 module Liquid
+
   module StandardFilters
     HTML_ESCAPE = {
-      '&' => '&',
+      '&'.freeze => '&'.freeze,
-      '>' => '>',
+      '>'.freeze => '>'.freeze,
-      '<' => '&lt;',
+      '<'.freeze => '&lt;'.freeze,
-      '"' => '&quot;',
+      '"'.freeze => '&quot;'.freeze,
-      "'" => '&#39;',
+      "'".freeze => '&#39;'.freeze
-    }.freeze
+    }
     HTML_ESCAPE_ONCE_REGEXP = /["><']|&(?!([a-zA-Z]+|(#\d+));)/
-    STRIP_HTML_BLOCKS = Regexp.union(
-      %r{<script.*?</script>}m,
-      /<!--.*?-->/m,
-      %r{<style.*?</style>}m
-    )
-    STRIP_HTML_TAGS = /<.*?>/m
 
     # Return the size of an array or of an string
     def size(input)
@@ -41,56 +34,29 @@ module Liquid
     end
 
     def escape(input)
-      CGI.escapeHTML(input.to_s).untaint unless input.nil?
+      CGI.escapeHTML(input) rescue input
     end
-    alias_method :h, :escape
 
     def escape_once(input)
       input.to_s.gsub(HTML_ESCAPE_ONCE_REGEXP, HTML_ESCAPE)
     end
 
-    def url_encode(input)
+    alias_method :h, :escape
-      CGI.escape(input.to_s) unless input.nil?
-    end
-
-    def url_decode(input)
-      return if input.nil?
-
-      result = CGI.unescape(input.to_s)
-      raise Liquid::ArgumentError, "invalid byte sequence in #{result.encoding}" unless result.valid_encoding?
-
-      result
-    end
-
-    def slice(input, offset, length = nil)
-      offset = Utils.to_integer(offset)
-      length = length ? Utils.to_integer(length) : 1
-
-      if input.is_a?(Array)
-        input.slice(offset, length) || []
-      else
-        input.to_s.slice(offset, length) || ''
-      end
-    end
 
     # Truncate a string down to x characters
-    def truncate(input, length = 50, truncate_string = "...")
+    def truncate(input, length = 50, truncate_string = "...".freeze)
-      return if input.nil?
+      if input.nil? then return end
-      input_str = input.to_s
+      l = length.to_i - truncate_string.length
-      length = Utils.to_integer(length)
-      truncate_string_str = truncate_string.to_s
-      l = length - truncate_string_str.length
       l = 0 if l < 0
-      input_str.length > length ? input_str[0...l].concat(truncate_string_str) : input_str
+      input.length > length.to_i ? input[0...l] + truncate_string : input
     end
 
-    def truncatewords(input, words = 15, truncate_string = "...")
+    def truncatewords(input, words = 15, truncate_string = "...".freeze)
-      return if input.nil?
+      if input.nil? then return end
       wordlist = input.to_s.split
-      words = Utils.to_integer(words)
+      l = words.to_i - 1
-      l = words - 1
       l = 0 if l < 0
-      wordlist.length > l ? wordlist[0..l].join(" ").concat(truncate_string.to_s) : input
+      wordlist.length > l ? wordlist[0..l].join(" ".freeze) + truncate_string : input
     end
 
     # Split input string into an array of substrings separated by given pattern.
@@ -99,7 +65,7 @@ module Liquid
     #   <div class="summary">{{ post | split '//' | first }}</div>
     #
     def split(input, pattern)
-      input.to_s.split(pattern.to_s)
+      input.split(pattern)
     end
 
     def strip(input)
@@ -115,160 +81,70 @@ module Liquid
     end
 
     def strip_html(input)
-      empty = ''
+      empty = ''.freeze
-      result = input.to_s.gsub(STRIP_HTML_BLOCKS, empty)
+      input.to_s.gsub(/<script.*?<\/script>/m, empty).gsub(/<!--.*?-->/m, empty).gsub(/<style.*?<\/style>/m, empty).gsub(/<.*?>/m, empty)
-      result.gsub!(STRIP_HTML_TAGS, empty)
-      result
     end
 
     # Remove all newlines from the string
     def strip_newlines(input)
-      input.to_s.gsub(/\r?\n/, '')
+      input.to_s.gsub(/\r?\n/, ''.freeze)
     end
 
     # Join elements of the array with certain character between them
-    def join(input, glue = ' ')
+    def join(input, glue = ' '.freeze)
-      InputIterator.new(input, context).join(glue)
+      [input].flatten.join(glue)
     end
 
     # Sort elements of the array
     # provide optional property with which to sort an array of hashes or drops
     def sort(input, property = nil)
-      ary = InputIterator.new(input, context)
+      ary = flatten_if_necessary(input)
-
-      return [] if ary.empty?
-
       if property.nil?
-        ary.sort do |a, b|
+        ary.sort
-          nil_safe_compare(a, b)
+      elsif ary.first.respond_to?('[]'.freeze) and !ary.first[property].nil?
-        end
+        ary.sort {|a,b| a[property] <=> b[property] }
-      elsif ary.all? { |el| el.respond_to?(:[]) }
+      elsif ary.first.respond_to?(property)
-        begin
+        ary.sort {|a,b| a.send(property) <=> b.send(property) }
-          ary.sort { |a, b| nil_safe_compare(a[property], b[property]) }
-        rescue TypeError
-          raise_property_error(property)
-        end
-      end
-    end
-
-    # Sort elements of an array ignoring case if strings
-    # provide optional property with which to sort an array of hashes or drops
-    def sort_natural(input, property = nil)
-      ary = InputIterator.new(input, context)
-
-      return [] if ary.empty?
-
-      if property.nil?
-        ary.sort do |a, b|
-          nil_safe_casecmp(a, b)
-        end
-      elsif ary.all? { |el| el.respond_to?(:[]) }
-        begin
-          ary.sort { |a, b| nil_safe_casecmp(a[property], b[property]) }
-        rescue TypeError
-          raise_property_error(property)
-        end
-      end
-    end
-
-    # Filter the elements of an array to those with a certain property value.
-    # By default the target is any truthy value.
-    def where(input, property, target_value = nil)
-      ary = InputIterator.new(input, context)
-
-      if ary.empty?
-        []
-      elsif ary.first.respond_to?(:[]) && target_value.nil?
-        begin
-          ary.select { |item| item[property] }
-        rescue TypeError
-          raise_property_error(property)
-        end
-      elsif ary.first.respond_to?(:[])
-        begin
-          ary.select { |item| item[property] == target_value }
-        rescue TypeError
-          raise_property_error(property)
-        end
-      end
-    end
-
-    # Remove duplicate elements from an array
-    # provide optional property with which to determine uniqueness
-    def uniq(input, property = nil)
-      ary = InputIterator.new(input, context)
-
-      if property.nil?
-        ary.uniq
-      elsif ary.empty? # The next two cases assume a non-empty array.
-        []
-      elsif ary.first.respond_to?(:[])
-        begin
-          ary.uniq { |a| a[property] }
-        rescue TypeError
-          raise_property_error(property)
-        end
       end
     end
 
     # Reverse the elements of an array
     def reverse(input)
-      ary = InputIterator.new(input, context)
+      ary = [input].flatten
       ary.reverse
     end
 
     # map/collect on a given property
     def map(input, property)
-      InputIterator.new(input, context).map do |e|
+      flatten_if_necessary(input).map do |e|
         e = e.call if e.is_a?(Proc)
 
-        if property == "to_liquid"
+        if property == "to_liquid".freeze
           e
         elsif e.respond_to?(:[])
-          r = e[property]
+          e[property]
-          r.is_a?(Proc) ? r.call : r
-        end
-      end
-    rescue TypeError
-      raise_property_error(property)
-    end
-
-    # Remove nils within an array
-    # provide optional property with which to check for nil
-    def compact(input, property = nil)
-      ary = InputIterator.new(input, context)
-
-      if property.nil?
-        ary.compact
-      elsif ary.empty? # The next two cases assume a non-empty array.
-        []
-      elsif ary.first.respond_to?(:[])
-        begin
-          ary.reject { |a| a[property].nil? }
-        rescue TypeError
-          raise_property_error(property)
         end
       end
     end
 
     # Replace occurrences of a string with another
-    def replace(input, string, replacement = '')
+    def replace(input, string, replacement = ''.freeze)
-      input.to_s.gsub(string.to_s, replacement.to_s)
+      input.to_s.gsub(string, replacement.to_s)
     end
 
     # Replace the first occurrences of a string with another
-    def replace_first(input, string, replacement = '')
+    def replace_first(input, string, replacement = ''.freeze)
-      input.to_s.sub(string.to_s, replacement.to_s)
+      input.to_s.sub(string, replacement.to_s)
     end
 
     # remove a substring
     def remove(input, string)
-      input.to_s.gsub(string.to_s, '')
+      input.to_s.gsub(string, ''.freeze)
     end
 
     # remove the first occurrences of a substring
     def remove_first(input, string)
-      input.to_s.sub(string.to_s, '')
+      input.to_s.sub(string, ''.freeze)
     end
 
     # add one string to another
@@ -276,13 +152,6 @@ module Liquid
       input.to_s + string.to_s
     end
 
-    def concat(input, array)
-      unless array.respond_to?(:to_ary)
-        raise ArgumentError, "concat filter requires an array argument"
-      end
-      InputIterator.new(input, context).concat(array)
-    end
-
     # prepend a string to another
     def prepend(input, string)
       string.to_s + input.to_s
@@ -290,10 +159,10 @@ module Liquid
 
     # Add <br /> tags in front of all newlines in input string
     def newline_to_br(input)
-      input.to_s.gsub(/\n/, "<br />\n")
+      input.to_s.gsub(/\n/, "<br />\n".freeze)
     end
 
-    # Reformat a date using Ruby's core Time#strftime( string ) -> string
+    # Reformat a date
     #
     #   %a - The abbreviated weekday name (``Sun'')
     #   %A - The  full  weekday  name (``Sunday'')
@@ -307,7 +176,6 @@ module Liquid
     #   %m - Month of the year (01..12)
     #   %M - Minute of the hour (00..59)
     #   %p - Meridian indicator (``AM''  or  ``PM'')
-    #   %s - Number of seconds since 1970-01-01 00:00:00 UTC.
     #   %S - Second of the minute (00..60)
     #   %U - Week  number  of the current year,
     #           starting with the first Sunday as the first
@@ -322,14 +190,34 @@ module Liquid
     #   %Y - Year with century
     #   %Z - Time zone name
     #   %% - Literal ``%'' character
-    #
-    #   See also: http://www.ruby-doc.org/core/Time.html#method-i-strftime
     def date(input, format)
-      return input if format.to_s.empty?
 
-      return input unless (date = Utils.to_date(input))
+      if format.to_s.empty?
+        return input.to_s
+      end
 
-      date.strftime(format.to_s)
+      if ((input.is_a?(String) && !/\A\d+\z/.match(input.to_s).nil?) || input.is_a?(Integer)) && input.to_i > 0
+        input = Time.at(input.to_i)
+      end
+
+      date = if input.is_a?(String)
+        case input.downcase
+        when 'now'.freeze, 'today'.freeze
+          Time.now
+        else
+          Time.parse(input)
+        end
+      else
+        input
+      end
+
+      if date.respond_to?(:strftime)
+        date.strftime(format.to_s)
+      else
+        input
+      end
+    rescue
+      input
     end
 
     # Get the first element of the passed in array
@@ -350,12 +238,6 @@ module Liquid
       array.last if array.respond_to?(:last)
     end
 
-    # absolute value
-    def abs(input)
-      result = Utils.to_number(input).abs
-      result.is_a?(BigDecimal) ? result.to_f : result
-    end
-
     # addition
     def plus(input, operand)
       apply_operation(input, operand, :+)
@@ -374,146 +256,47 @@ module Liquid
     # division
     def divided_by(input, operand)
       apply_operation(input, operand, :/)
-    rescue ::ZeroDivisionError => e
-      raise Liquid::ZeroDivisionError, e.message
     end
 
     def modulo(input, operand)
       apply_operation(input, operand, :%)
-    rescue ::ZeroDivisionError => e
-      raise Liquid::ZeroDivisionError, e.message
     end
 
-    def round(input, n = 0)
+    def default(input, default_value = "".freeze)
-      result = Utils.to_number(input).round(Utils.to_number(n))
+      is_blank = input.respond_to?(:empty?) ? input.empty? : !input
-      result = result.to_f if result.is_a?(BigDecimal)
+      is_blank ? default_value : input
-      result = result.to_i if n == 0
-      result
-    rescue ::FloatDomainError => e
-      raise Liquid::FloatDomainError, e.message
-    end
-
-    def ceil(input)
-      Utils.to_number(input).ceil.to_i
-    rescue ::FloatDomainError => e
-      raise Liquid::FloatDomainError, e.message
-    end
-
-    def floor(input)
-      Utils.to_number(input).floor.to_i
-    rescue ::FloatDomainError => e
-      raise Liquid::FloatDomainError, e.message
-    end
-
-    def at_least(input, n)
-      min_value = Utils.to_number(n)
-
-      result = Utils.to_number(input)
-      result = min_value if min_value > result
-      result.is_a?(BigDecimal) ? result.to_f : result
-    end
-
-    def at_most(input, n)
-      max_value = Utils.to_number(n)
-
-      result = Utils.to_number(input)
-      result = max_value if max_value < result
-      result.is_a?(BigDecimal) ? result.to_f : result
-    end
-
-    # Set a default value when the input is nil, false or empty
-    #
-    # Example:
-    #    {{ product.title | default: "No Title" }}
-    #
-    # Use `allow_false` when an input should only be tested against nil or empty and not false.
-    #
-    # Example:
-    #    {{ product.title | default: "No Title", allow_false: true }}
-    #
-    def default(input, default_value = '', options = {})
-      options = {} unless options.is_a?(Hash)
-      false_check = options['allow_false'] ? input.nil? : !input
-      false_check || (input.respond_to?(:empty?) && input.empty?) ? default_value : input
     end
 
     private
 
-    attr_reader :context
+    def flatten_if_necessary(input)
+      ary = if input.is_a?(Array)
+        input.flatten
+      elsif input.is_a?(Enumerable) && !input.is_a?(Hash)
+        input
+      else
+        [input].flatten
+      end
+      ary.map{ |e| e.respond_to?(:to_liquid) ? e.to_liquid : e }
+    end
 
-    def raise_property_error(property)
+    def to_number(obj)
-      raise Liquid::ArgumentError, "cannot select the property '#{property}'"
+      case obj
+      when Float
+        BigDecimal.new(obj.to_s)
+      when Numeric
+        obj
+      when String
+        (obj.strip =~ /\A\d+\.\d+\z/) ? BigDecimal.new(obj) : obj.to_i
+      else
+        0
+      end
     end
 
     def apply_operation(input, operand, operation)
-      result = Utils.to_number(input).send(operation, Utils.to_number(operand))
+      result = to_number(input).send(operation, to_number(operand))
       result.is_a?(BigDecimal) ? result.to_f : result
     end
-
-    def nil_safe_compare(a, b)
-      if !a.nil? && !b.nil?
-        a <=> b
-      else
-        a.nil? ? 1 : -1
-      end
-    end
-
-    def nil_safe_casecmp(a, b)
-      if !a.nil? && !b.nil?
-        a.to_s.casecmp(b.to_s)
-      else
-        a.nil? ? 1 : -1
-      end
-    end
-
-    class InputIterator
-      include Enumerable
-
-      def initialize(input, context)
-        @context = context
-        @input = if input.is_a?(Array)
-          input.flatten
-        elsif input.is_a?(Hash)
-          [input]
-        elsif input.is_a?(Enumerable)
-          input
-        else
-          Array(input)
-        end
-      end
-
-      def join(glue)
-        to_a.join(glue.to_s)
-      end
-
-      def concat(args)
-        to_a.concat(args)
-      end
-
-      def reverse
-        reverse_each.to_a
-      end
-
-      def uniq(&block)
-        to_a.uniq(&block)
-      end
-
-      def compact
-        to_a.compact
-      end
-
-      def empty?
-        @input.each { return false }
-        true
-      end
-
-      def each
-        @input.each do |e|
-          e.context = @context if e.respond_to?(:context=)
-          yield(e.respond_to?(:to_liquid) ? e.to_liquid : e)
-        end
-      end
-    end
   end
 
   Template.register_filter(StandardFilters)

lib/liquid/static_registers.rb

@@ -1,36 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class StaticRegisters
-    attr_reader :static, :registers
-
-    def initialize(registers = {})
-      @static = registers.is_a?(StaticRegisters) ? registers.static : registers
-      @registers = {}
-    end
-
-    def []=(key, value)
-      @registers[key] = value
-    end
-
-    def [](key)
-      if @registers.key?(key)
-        @registers[key]
-      else
-        @static[key]
-      end
-    end
-
-    def delete(key)
-      @registers.delete(key)
-    end
-
-    def fetch(key, default = nil)
-      key?(key) ? self[key] : default
-    end
-
-    def key?(key)
-      @registers.key?(key) || @static.key?(key)
-    end
-  end
-end

lib/liquid/strainer.rb

@@ -1,21 +1,19 @@
-# frozen_string_literal: true
-
 require 'set'
 
 module Liquid
+
   # Strainer is the parent class for the filters system.
   # New filters are mixed into the strainer class which is then instantiated for each liquid template render run.
   #
   # The Strainer only allows method calls defined in filters given to it via Strainer.global_filter,
   # Context#add_filters or Template.register_filter
   class Strainer #:nodoc:
-    @@global_strainer = Class.new(Strainer) do
+    @@filters = []
-      @filter_methods = Set.new
+    @@known_filters = Set.new
-    end
+    @@known_methods = Set.new
     @@strainer_class_cache = Hash.new do |hash, filters|
-      hash[filters] = Class.new(@@global_strainer) do
+      hash[filters] = Class.new(Strainer) do
-        @filter_methods = @@global_strainer.filter_methods.dup
+        filters.each { |f| include f }
-        filters.each { |f| add_filter(f) }
       end
     end
 
@@ -23,46 +21,43 @@ module Liquid
       @context = context
     end
 
-    class << self
+    def self.global_filter(filter)
-      attr_reader :filter_methods
+      raise ArgumentError, "Passed filter is not a module" unless filter.is_a?(Module)
+      add_known_filter(filter)
+      @@filters << filter unless @@filters.include?(filter)
     end
 
-    def self.add_filter(filter)
+    def self.add_known_filter(filter)
-      raise ArgumentError, "Expected module but got: #{filter.class}" unless filter.is_a?(Module)
+      unless @@known_filters.include?(filter)
-      unless include?(filter)
+        @@method_blacklist ||= Set.new(Strainer.instance_methods.map(&:to_s))
-        invokable_non_public_methods = (filter.private_instance_methods + filter.protected_instance_methods).select { |m| invokable?(m) }
+        new_methods = filter.instance_methods.map(&:to_s)
-        if invokable_non_public_methods.any?
+        new_methods.reject!{ |m| @@method_blacklist.include?(m) }
-          raise MethodOverrideError, "Filter overrides registered public methods as non public: #{invokable_non_public_methods.join(', ')}"
+        @@known_methods.merge(new_methods)
-        else
+        @@known_filters.add(filter)
-          send(:include, filter)
-          @filter_methods.merge(filter.public_instance_methods.map(&:to_s))
-        end
       end
     end
 
-    def self.global_filter(filter)
+    def self.strainer_class_cache
-      @@strainer_class_cache.clear
+      @@strainer_class_cache
-      @@global_strainer.add_filter(filter)
-    end
-
-    def self.invokable?(method)
-      @filter_methods.include?(method.to_s)
     end
 
     def self.create(context, filters = [])
-      @@strainer_class_cache[filters].new(context)
+      filters = @@filters + filters
+      strainer_class_cache[filters].new(context)
     end
 
     def invoke(method, *args)
-      if self.class.invokable?(method)
+      if invokable?(method)
         send(method, *args)
-      elsif @context&.strict_filters
-        raise Liquid::UndefinedFilter, "undefined filter #{method}"
       else
         args.first
       end
     rescue ::ArgumentError => e
-      raise Liquid::ArgumentError, e.message, e.backtrace
+      raise Liquid::ArgumentError.new(e.message)
+    end
+
+    def invokable?(method)
+      @@known_methods.include?(method.to_s) && respond_to?(method)
     end
   end
 end

lib/liquid/tablerowloop_drop.rb

@@ -1,64 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class TablerowloopDrop < Drop
-    def initialize(length, cols)
-      @length = length
-      @row = 1
-      @col = 1
-      @cols = cols
-      @index = 0
-    end
-
-    attr_reader :length, :col, :row
-
-    def index
-      @index + 1
-    end
-
-    def index0
-      @index
-    end
-
-    def col0
-      @col - 1
-    end
-
-    def rindex
-      @length - @index
-    end
-
-    def rindex0
-      @length - @index - 1
-    end
-
-    def first
-      @index == 0
-    end
-
-    def last
-      @index == @length - 1
-    end
-
-    def col_first
-      @col == 1
-    end
-
-    def col_last
-      @col == @cols
-    end
-
-    protected
-
-    def increment!
-      @index += 1
-
-      if @col == @cols
-        @col = 1
-        @row += 1
-      else
-        @col += 1
-      end
-    end
-  end
-end

lib/liquid/tag.rb

@@ -1,73 +1,60 @@
-# frozen_string_literal: true
-
 module Liquid
   class Tag
-    attr_reader :nodelist, :tag_name, :line_number, :parse_context
+    attr_accessor :options
-    alias_method :options, :parse_context
+    attr_reader :nodelist, :warnings
-    include ParserSwitching
 
     class << self
-      def parse(tag_name, markup, tokenizer, parse_context)
+      def parse(tag_name, markup, tokens, options)
-        tag = new(tag_name, markup, parse_context)
+        tag = new(tag_name, markup, options)
-        tag.parse(tokenizer)
+        tag.parse(tokens)
         tag
       end
 
-      def disable_tags(*tags)
-        disabled_tags.push(*tags)
-      end
-
       private :new
-
-      def disabled_tags
-        @disabled_tags ||= []
-      end
     end
 
-    def initialize(tag_name, markup, parse_context)
+    def initialize(tag_name, markup, options)
       @tag_name   = tag_name
       @markup     = markup
-      @parse_context = parse_context
+      @options    = options
-      @line_number = parse_context.line_number
     end
 
-    def parse(_tokens)
+    def parse(tokens)
-    end
-
-    def raw
-      "#{@tag_name} #{@markup}"
     end
 
     def name
       self.class.name.downcase
     end
 
-    def render(_context)
+    def render(context)
-      ''
+      ''.freeze
-    end
-
-    def disabled?(context)
-      context.registers[:disabled_tags].disabled?(tag_name)
-    end
-
-    def disabled_error_message
-      "#{tag_name} #{options[:locale].t('errors.disabled.tag')}"
-    end
-
-    # For backwards compatibility with custom tags. In a future release, the semantics
-    # of the `render_to_output_buffer` method will become the default and the `render`
-    # method will be removed.
-    def render_to_output_buffer(context, output)
-      output << render(context)
-      output
     end
 
     def blank?
-      false
+      @blank || false
     end
 
-    def disabled_tags
+    def parse_with_selected_parser(markup)
-      self.class.disabled_tags
+      case @options[:error_mode] || Template.error_mode
+      when :strict then strict_parse_with_error_context(markup)
+      when :lax    then lax_parse(markup)
+      when :warn
+        begin
+          return strict_parse_with_error_context(markup)
+        rescue SyntaxError => e
+          @warnings ||= []
+          @warnings << e
+          return lax_parse(markup)
+        end
+      end
     end
-  end
+
-end
+    private
+    def strict_parse_with_error_context(markup)
+      strict_parse(markup)
+    rescue SyntaxError => e
+      e.message << " in \"#{markup.strip}\"" 
+      raise e
+    end
+  end # Tag
+end # Liquid

lib/liquid/tags/assign.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # Assign sets a variable in your template.
   #
   #   {% assign foo = 'monkey' %}
@@ -12,54 +11,27 @@ module Liquid
   class Assign < Tag
     Syntax = /(#{VariableSignature}+)\s*=\s*(.*)\s*/om
 
-    def self.syntax_error_translation_key
-      "errors.syntax.assign"
-    end
-
-    attr_reader :to, :from
-
     def initialize(tag_name, markup, options)
       super
       if markup =~ Syntax
-        @to = Regexp.last_match(1)
+        @to = $1
-        @from = Variable.new(Regexp.last_match(2), options)
+        @from = Variable.new($2)
       else
-        raise SyntaxError, options[:locale].t(self.class.syntax_error_translation_key)
+        raise SyntaxError.new options[:locale].t("errors.syntax.assign".freeze)
       end
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
       val = @from.render(context)
       context.scopes.last[@to] = val
-      context.resource_limits.assign_score += assign_score_of(val)
+      context.increment_used_resources(:assign_score_current, val)
-      output
+      ''.freeze
     end
 
     def blank?
       true
     end
-
-    private
-
-    def assign_score_of(val)
-      if val.instance_of?(String)
-        val.bytesize
-      elsif val.instance_of?(Array) || val.instance_of?(Hash)
-        sum = 1
-        # Uses #each to avoid extra allocations.
-        val.each { |child| sum += assign_score_of(child) }
-        sum
-      else
-        1
-      end
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        [@node.from]
-      end
-    end
   end
 
-  Template.register_tag('assign', Assign)
+  Template.register_tag('assign'.freeze, Assign)
 end

lib/liquid/tags/break.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # Break tag to be used to break out of a for loop.
   #
   # == Basic Usage:
@@ -11,10 +10,12 @@ module Liquid
   #    {% endfor %}
   #
   class Break < Tag
+
     def interrupt
       BreakInterrupt.new
     end
+
   end
 
-  Template.register_tag('break', Break)
+  Template.register_tag('break'.freeze, Break)
 end

lib/liquid/tags/capture.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # Capture stores the result of a block into a variable without rendering it inplace.
   #
   #   {% capture heading %}
@@ -13,23 +12,22 @@ module Liquid
   # in a sidebar or footer.
   #
   class Capture < Block
-    Syntax = /(#{VariableSignature}+)/o
+    Syntax = /(\w+)/
 
     def initialize(tag_name, markup, options)
       super
       if markup =~ Syntax
-        @to = Regexp.last_match(1)
+        @to = $1
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.capture")
+        raise SyntaxError.new(options[:locale].t("errors.syntax.capture"))
       end
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
-      previous_output_size = output.bytesize
+      output = super
-      super
       context.scopes.last[@to] = output
-      context.resource_limits.assign_score += (output.bytesize - previous_output_size)
+      context.increment_used_resources(:assign_score_current, output)
-      output
+      ''.freeze
     end
 
     def blank?
@@ -37,5 +35,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('capture', Capture)
+  Template.register_tag('capture'.freeze, Capture)
 end

lib/liquid/tags/case.rb

@@ -1,92 +1,79 @@
-# frozen_string_literal: true
-
 module Liquid
   class Case < Block
     Syntax     = /(#{QuotedFragment})/o
     WhenSyntax = /(#{QuotedFragment})(?:(?:\s+or\s+|\s*\,\s*)(#{QuotedFragment}.*))?/om
 
-    attr_reader :blocks, :left
-
     def initialize(tag_name, markup, options)
       super
       @blocks = []
 
       if markup =~ Syntax
-        @left = Expression.parse(Regexp.last_match(1))
+        @left = $1
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.case")
+        raise SyntaxError.new(options[:locale].t("errors.syntax.case".freeze))
       end
     end
 
-    def parse(tokens)
-      body = BlockBody.new
-      body = @blocks.last.attachment while parse_body(body, tokens)
-    end
-
     def nodelist
-      @blocks.map(&:attachment)
+      @blocks.map(&:attachment).flatten
     end
 
     def unknown_tag(tag, markup, tokens)
+      @nodelist = []
       case tag
-      when 'when'
+      when 'when'.freeze
         record_when_condition(markup)
-      when 'else'
+      when 'else'.freeze
         record_else_condition(markup)
       else
         super
       end
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
-      execute_else_block = true
+      context.stack do
+        execute_else_block = true
 
-      @blocks.each do |block|
+        output = ''
-        if block.else?
+        @blocks.each do |block|
-          block.attachment.render_to_output_buffer(context, output) if execute_else_block
+          if block.else?
-        elsif block.evaluate(context)
+            return render_all(block.attachment, context) if execute_else_block
-          execute_else_block = false
+          elsif block.evaluate(context)
-          block.attachment.render_to_output_buffer(context, output)
+            execute_else_block = false
+            output << render_all(block.attachment, context)
+          end
         end
+        output
       end
-
-      output
     end
 
     private
 
     def record_when_condition(markup)
-      body = BlockBody.new
-
       while markup
-        unless markup =~ WhenSyntax
+        # Create a new nodelist and assign it to the new block
-          raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_when")
+        if not markup =~ WhenSyntax
+          raise SyntaxError.new(options[:locale].t("errors.syntax.case_invalid_when".freeze))
         end
 
-        markup = Regexp.last_match(2)
+        markup = $2
 
-        block = Condition.new(@left, '==', Expression.parse(Regexp.last_match(1)))
+        block = Condition.new(@left, '=='.freeze, $1)
-        block.attach(body)
+        block.attach(@nodelist)
-        @blocks << block
+        @blocks.push(block)
       end
     end
 
     def record_else_condition(markup)
-      unless markup.strip.empty?
+      if not markup.strip.empty?
-        raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_else")
+        raise SyntaxError.new(options[:locale].t("errors.syntax.case_invalid_else".freeze))
       end
 
       block = ElseCondition.new
-      block.attach(BlockBody.new)
+      block.attach(@nodelist)
       @blocks << block
     end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        [@node.left] + @node.blocks
-      end
-    end
   end
 
-  Template.register_tag('case', Case)
+  Template.register_tag('case'.freeze, Case)
 end

lib/liquid/tags/comment.rb

@@ -1,12 +1,10 @@
-# frozen_string_literal: true
-
 module Liquid
   class Comment < Block
-    def render_to_output_buffer(_context, output)
+    def render(context)
-      output
+      ''.freeze
     end
 
-    def unknown_tag(_tag, _markup, _tokens)
+    def unknown_tag(tag, markup, tokens)
     end
 
     def blank?
@@ -14,5 +12,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('comment', Comment)
+  Template.register_tag('comment'.freeze, Comment)
 end

lib/liquid/tags/continue.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Continue tag to be used to break out of a for loop.
   #
@@ -16,5 +14,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('continue', Continue)
+  Template.register_tag('continue'.freeze, Continue)
 end

lib/liquid/tags/cycle.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Cycle is usually used within a loop to alternate between values, like colors or DOM classes.
   #
@@ -17,59 +15,45 @@ module Liquid
     SimpleSyntax = /\A#{QuotedFragment}+/o
     NamedSyntax  = /\A(#{QuotedFragment})\s*\:\s*(.*)/om
 
-    attr_reader :variables
-
     def initialize(tag_name, markup, options)
       super
       case markup
       when NamedSyntax
-        @variables = variables_from_string(Regexp.last_match(2))
+        @variables = variables_from_string($2)
-        @name = Expression.parse(Regexp.last_match(1))
+        @name = $1
       when SimpleSyntax
         @variables = variables_from_string(markup)
-        @name = @variables.to_s
+        @name = "'#{@variables.to_s}'"
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.cycle")
+        raise SyntaxError.new(options[:locale].t("errors.syntax.cycle".freeze))
       end
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
-      context.registers[:cycle] ||= {}
+      context.registers[:cycle] ||= Hash.new(0)
 
-      key = context.evaluate(@name)
+      context.stack do
-      iteration = context.registers[:cycle][key].to_i
+        key = context[@name]
-
+        iteration = context.registers[:cycle][key]
-      val = context.evaluate(@variables[iteration])
+        result = context[@variables[iteration]]
-
+        iteration += 1
-      if val.is_a?(Array)
+        iteration  = 0  if iteration >= @variables.size
-        val = val.join
+        context.registers[:cycle][key] = iteration
-      elsif !val.is_a?(String)
+        result
-        val = val.to_s
       end
+    end
 
-      output << val
+    def blank?
-
+      false
-      iteration += 1
-      iteration  = 0 if iteration >= @variables.size
-      context.registers[:cycle][key] = iteration
-
-      output
     end
 
     private
-
     def variables_from_string(markup)
       markup.split(',').collect do |var|
         var =~ /\s*(#{QuotedFragment})\s*/o
-        Regexp.last_match(1) ? Expression.parse(Regexp.last_match(1)) : nil
+        $1 ? $1 : nil
       end.compact
     end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        Array(@node.variables)
-      end
-    end
   end
 
   Template.register_tag('cycle', Cycle)

lib/liquid/tags/decrement.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # decrement is used in a place where one needs to insert a counter
   #     into a template, and needs the counter to survive across
   #     multiple instantiations of the template.
@@ -25,14 +24,15 @@ module Liquid
       @variable = markup.strip
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
       value = context.environments.first[@variable] ||= 0
-      value -= 1
+      value = value - 1
       context.environments.first[@variable] = value
-      output << value.to_s
+      value.to_s
-      output
     end
+
+    private
   end
 
-  Template.register_tag('decrement', Decrement)
+  Template.register_tag('decrement'.freeze, Decrement)
 end

lib/liquid/tags/echo.rb

@@ -1,26 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  # Echo outputs an expression
-  #
-  #   {% echo monkey %}
-  #   {% echo user.name %}
-  #
-  # This is identical to variable output syntax, like {{ foo }}, but works
-  # inside {% liquid %} tags. The full syntax is supported, including filters:
-  #
-  #   {% echo user | link %}
-  #
-  class Echo < Tag
-    def initialize(tag_name, markup, parse_context)
-      super
-      @variable = Variable.new(markup, parse_context)
-    end
-
-    def render(context)
-      @variable.render_to_output_buffer(context, +'')
-    end
-  end
-
-  Template.register_tag('echo', Echo)
-end

lib/liquid/tags/for.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # "For" iterates over an array or collection.
   # Several useful variables are available to you within the loop.
   #
@@ -25,7 +24,7 @@ module Liquid
   #      {{ item.name }}
   #    {% end %}
   #
-  #  To reverse the for loop simply use {% for item in collection reversed %} (note that the flag's spelling is different to the filter `reverse`)
+  #  To reverse the for loop simply use {% for item in collection reversed %}
   #
   # == Available variables:
   #
@@ -43,175 +42,134 @@ module Liquid
   #                   where 0 is the last item.
   # forloop.first:: Returns true if the item is the first item.
   # forloop.last:: Returns true if the item is the last item.
-  # forloop.parentloop:: Provides access to the parent loop, if present.
   #
   class For < Block
     Syntax = /\A(#{VariableSegment}+)\s+in\s+(#{QuotedFragment}+)\s*(reversed)?/o
 
-    attr_reader :collection_name, :variable_name, :limit, :from
-
     def initialize(tag_name, markup, options)
       super
-      @from = @limit = nil
       parse_with_selected_parser(markup)
-      @for_block = BlockBody.new
+      @nodelist = @for_block = []
-      @else_block = nil
-    end
-
-    def parse(tokens)
-      return unless parse_body(@for_block, tokens)
-      parse_body(@else_block, tokens)
     end
 
     def nodelist
-      @else_block ? [@for_block, @else_block] : [@for_block]
+      if @else_block
+        @for_block + @else_block
+      else
+        @for_block
+      end
     end
 
     def unknown_tag(tag, markup, tokens)
-      return super unless tag == 'else'
+      return super unless tag == 'else'.freeze
-      @else_block = BlockBody.new
+      @nodelist = @else_block = []
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
-      segment = collection_segment(context)
+      context.registers[:for] ||= Hash.new(0)
 
-      if segment.empty?
+      collection = context[@collection_name]
-        render_else(context, output)
+      collection = collection.to_a if collection.is_a?(Range)
+
+      # Maintains Ruby 1.8.7 String#each behaviour on 1.9
+      return render_else(context) unless iterable?(collection)
+
+      from = if @attributes['offset'.freeze] == 'continue'.freeze
+        context.registers[:for][@name].to_i
       else
-        render_segment(context, output, segment)
+        context[@attributes['offset'.freeze]].to_i
       end
 
-      output
+      limit = context[@attributes['limit'.freeze]]
+      to    = limit ? limit.to_i + from : nil
+
+      segment = Utils.slice_collection(collection, from, to)
+
+      return render_else(context) if segment.empty?
+
+      segment.reverse! if @reversed
+
+      result = ''
+
+      length = segment.length
+
+      # Store our progress through the collection for the continue flag
+      context.registers[:for][@name] = from + segment.length
+
+      context.stack do
+        segment.each_with_index do |item, index|
+          context[@variable_name] = item
+          context['forloop'.freeze] = {
+            'name'.freeze    => @name,
+            'length'.freeze  => length,
+            'index'.freeze   => index + 1,
+            'index0'.freeze  => index,
+            'rindex'.freeze  => length - index,
+            'rindex0'.freeze => length - index - 1,
+            'first'.freeze   => (index == 0),
+            'last'.freeze    => (index == length - 1)
+          }
+
+          result << render_all(@for_block, context)
+
+          # Handle any interrupts if they exist.
+          if context.has_interrupt?
+            interrupt = context.pop_interrupt
+            break if interrupt.is_a? BreakInterrupt
+            next if interrupt.is_a? ContinueInterrupt
+          end
+        end
+      end
+      result
     end
 
     protected
 
     def lax_parse(markup)
       if markup =~ Syntax
-        @variable_name = Regexp.last_match(1)
+        @variable_name = $1
-        collection_name = Regexp.last_match(2)
+        @collection_name = $2
-        @reversed = !!Regexp.last_match(3)
+        @name = "#{$1}-#{$2}"
-        @name = "#{@variable_name}-#{collection_name}"
+        @reversed = $3
-        @collection_name = Expression.parse(collection_name)
+        @attributes = {}
         markup.scan(TagAttributes) do |key, value|
-          set_attribute(key, value)
+          @attributes[key] = value
         end
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.for")
+        raise SyntaxError.new(options[:locale].t("errors.syntax.for".freeze))
       end
     end
 
     def strict_parse(markup)
       p = Parser.new(markup)
       @variable_name = p.consume(:id)
-      raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_in") unless p.id?('in')
+      raise SyntaxError.new(options[:locale].t("errors.syntax.for_invalid_in".freeze))  unless p.id?('in'.freeze)
-      collection_name = p.expression
+      @collection_name = p.expression
-      @name = "#{@variable_name}-#{collection_name}"
+      @name = "#{@variable_name}-#{@collection_name}"
-      @collection_name = Expression.parse(collection_name)
+      @reversed = p.id?('reversed'.freeze)
-      @reversed = p.id?('reversed')
 
+      @attributes = {}
       while p.look(:id) && p.look(:colon, 1)
-        unless (attribute = p.id?('limit') || p.id?('offset'))
+        unless attribute = p.id?('limit'.freeze) || p.id?('offset'.freeze)
-          raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_attribute")
+          raise SyntaxError.new(options[:locale].t("errors.syntax.for_invalid_attribute".freeze))
         end
         p.consume
-        set_attribute(attribute, p.expression)
+        val = p.expression
+        @attributes[attribute] = val
       end
       p.consume(:end_of_string)
     end
 
     private
 
-    def collection_segment(context)
+    def render_else(context)
-      offsets = context.registers[:for] ||= {}
+      return @else_block ? [render_all(@else_block, context)] : ''.freeze
-
-      from = if @from == :continue
-        offsets[@name].to_i
-      else
-        from_value = context.evaluate(@from)
-        if from_value.nil?
-          0
-        else
-          Utils.to_integer(from_value)
-        end
-      end
-
-      collection = context.evaluate(@collection_name)
-      collection = collection.to_a if collection.is_a?(Range)
-
-      limit_value = context.evaluate(@limit)
-      to = if limit_value.nil?
-        nil
-      else
-        Utils.to_integer(limit_value) + from
-      end
-
-      segment = Utils.slice_collection(collection, from, to)
-      segment.reverse! if @reversed
-
-      offsets[@name] = from + segment.length
-
-      segment
     end
 
-    def render_segment(context, output, segment)
+    def iterable?(collection)
-      for_stack = context.registers[:for_stack] ||= []
+      collection.respond_to?(:each) || Utils.non_blank_string?(collection)
-      length = segment.length
-
-      context.stack do
-        loop_vars = Liquid::ForloopDrop.new(@name, length, for_stack[-1])
-
-        for_stack.push(loop_vars)
-
-        begin
-          context['forloop'] = loop_vars
-
-          segment.each do |item|
-            context[@variable_name] = item
-            @for_block.render_to_output_buffer(context, output)
-            loop_vars.send(:increment!)
-
-            # Handle any interrupts if they exist.
-            next unless context.interrupt?
-            interrupt = context.pop_interrupt
-            break if interrupt.is_a?(BreakInterrupt)
-            next if interrupt.is_a?(ContinueInterrupt)
-          end
-        ensure
-          for_stack.pop
-        end
-      end
-
-      output
-    end
-
-    def set_attribute(key, expr)
-      case key
-      when 'offset'
-        @from = if expr == 'continue'
-          :continue
-        else
-          Expression.parse(expr)
-        end
-      when 'limit'
-        @limit = Expression.parse(expr)
-      end
-    end
-
-    def render_else(context, output)
-      if @else_block
-        @else_block.render_to_output_buffer(context, output)
-      else
-        output
-      end
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        (super + [@node.limit, @node.from, @node.collection_name]).compact
-      end
     end
   end
 
-  Template.register_tag('for', For)
+  Template.register_tag('for'.freeze, For)
 end

lib/liquid/tags/if.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # If is the conditional block
   #
@@ -14,110 +12,95 @@ module Liquid
   class If < Block
     Syntax = /(#{QuotedFragment})\s*([=!<>a-z_]+)?\s*(#{QuotedFragment})?/o
     ExpressionsAndOperators = /(?:\b(?:\s?and\s?|\s?or\s?)\b|(?:\s*(?!\b(?:\s?and\s?|\s?or\s?)\b)(?:#{QuotedFragment}|\S+)\s*)+)/o
-    BOOLEAN_OPERATORS = %w(and or).freeze
+    BOOLEAN_OPERATORS = %w(and or)
-
-    attr_reader :blocks
 
     def initialize(tag_name, markup, options)
       super
       @blocks = []
-      push_block('if', markup)
+      push_block('if'.freeze, markup)
     end
 
     def nodelist
-      @blocks.map(&:attachment)
+      @blocks.map(&:attachment).flatten
-    end
-
-    def parse(tokens)
-      while parse_body(@blocks.last.attachment, tokens)
-      end
     end
 
     def unknown_tag(tag, markup, tokens)
-      if ['elsif', 'else'].include?(tag)
+      if ['elsif'.freeze, 'else'.freeze].include?(tag)
         push_block(tag, markup)
       else
         super
       end
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
-      @blocks.each do |block|
+      context.stack do
-        if block.evaluate(context)
+        @blocks.each do |block|
-          return block.attachment.render_to_output_buffer(context, output)
+          if block.evaluate(context)
+            return render_all(block.attachment, context)
+          end
         end
+        ''.freeze
       end
-
-      output
     end
 
     private
 
-    def push_block(tag, markup)
+      def push_block(tag, markup)
-      block = if tag == 'else'
+        block = if tag == 'else'.freeze
-        ElseCondition.new
+          ElseCondition.new
-      else
+        else
-        parse_with_selected_parser(markup)
+          parse_with_selected_parser(markup)
+        end
+
+        @blocks.push(block)
+        @nodelist = block.attach(Array.new)
       end
 
-      @blocks.push(block)
+      def lax_parse(markup)
-      block.attach(BlockBody.new)
+        expressions = markup.scan(ExpressionsAndOperators).reverse
-    end
+        raise(SyntaxError.new(options[:locale].t("errors.syntax.if".freeze))) unless expressions.shift =~ Syntax
 
-    def lax_parse(markup)
+        condition = Condition.new($1, $2, $3)
-      expressions = markup.scan(ExpressionsAndOperators)
-      raise SyntaxError, options[:locale].t("errors.syntax.if") unless expressions.pop =~ Syntax
 
-      condition = Condition.new(Expression.parse(Regexp.last_match(1)), Regexp.last_match(2), Expression.parse(Regexp.last_match(3)))
+        while not expressions.empty?
+          operator = (expressions.shift).to_s.strip
 
-      until expressions.empty?
+          raise(SyntaxError.new(options[:locale].t("errors.syntax.if".freeze))) unless expressions.shift.to_s =~ Syntax
-        operator = expressions.pop.to_s.strip
 
-        raise SyntaxError, options[:locale].t("errors.syntax.if") unless expressions.pop.to_s =~ Syntax
+          new_condition = Condition.new($1, $2, $3)
+          raise(SyntaxError.new(options[:locale].t("errors.syntax.if".freeze))) unless BOOLEAN_OPERATORS.include?(operator)
+          new_condition.send(operator, condition)
+          condition = new_condition
+        end
 
-        new_condition = Condition.new(Expression.parse(Regexp.last_match(1)), Regexp.last_match(2), Expression.parse(Regexp.last_match(3)))
+        condition
-        raise SyntaxError, options[:locale].t("errors.syntax.if") unless BOOLEAN_OPERATORS.include?(operator)
-        new_condition.send(operator, condition)
-        condition = new_condition
       end
 
-      condition
+      def strict_parse(markup)
-    end
+        p = Parser.new(markup)
 
-    def strict_parse(markup)
+        condition = parse_comparison(p)
-      p = Parser.new(markup)
-      condition = parse_binary_comparisons(p)
-      p.consume(:end_of_string)
-      condition
-    end
 
-    def parse_binary_comparisons(p)
+        while op = (p.id?('and'.freeze) || p.id?('or'.freeze))
-      condition = parse_comparison(p)
+          new_cond = parse_comparison(p)
-      first_condition = condition
+          new_cond.send(op, condition)
-      while (op = (p.id?('and') || p.id?('or')))
+          condition = new_cond
-        child_condition = parse_comparison(p)
+        end
-        condition.send(op, child_condition)
+        p.consume(:end_of_string)
-        condition = child_condition
+
+        condition
       end
-      first_condition
-    end
 
-    def parse_comparison(p)
+      def parse_comparison(p)
-      a = Expression.parse(p.expression)
+        a = p.expression
-      if (op = p.consume?(:comparison))
+        if op = p.consume?(:comparison)
-        b = Expression.parse(p.expression)
+          b = p.expression
-        Condition.new(a, op, b)
+          Condition.new(a, op, b)
-      else
+        else
-        Condition.new(a)
+          Condition.new(a)
+        end
       end
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        @node.blocks
-      end
-    end
   end
 
-  Template.register_tag('if', If)
+  Template.register_tag('if'.freeze, If)
 end

lib/liquid/tags/ifchanged.rb

@@ -1,19 +1,20 @@
-# frozen_string_literal: true
-
 module Liquid
   class Ifchanged < Block
-    def render_to_output_buffer(context, output)
-      block_output = +''
-      super(context, block_output)
 
-      if block_output != context.registers[:ifchanged]
+    def render(context)
-        context.registers[:ifchanged] = block_output
+      context.stack do
-        output << block_output
+
+        output = render_all(@nodelist, context)
+
+        if output != context.registers[:ifchanged]
+          context.registers[:ifchanged] = output
+          output
+        else
+          ''.freeze
+        end
       end
-
-      output
     end
   end
 
-  Template.register_tag('ifchanged', Ifchanged)
+  Template.register_tag('ifchanged'.freeze, Ifchanged)
 end

lib/liquid/tags/include.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # Include allows templates to relate with other templates
   #
   # Simply include another template:
@@ -16,94 +15,84 @@ module Liquid
   #   {% include 'product' for products %}
   #
   class Include < Tag
-    SYNTAX = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o
+    Syntax = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?/o
-    Syntax = SYNTAX
-
-    attr_reader :template_name_expr, :variable_name_expr, :attributes
 
     def initialize(tag_name, markup, options)
       super
 
-      if markup =~ SYNTAX
+      if markup =~ Syntax
 
-        template_name = Regexp.last_match(1)
+        @template_name = $1
-        variable_name = Regexp.last_match(3)
+        @variable_name = $3
-
+        @attributes    = {}
-        @alias_name = Regexp.last_match(5)
-        @variable_name_expr = variable_name ? Expression.parse(variable_name) : nil
-        @template_name_expr = Expression.parse(template_name)
-        @attributes = {}
 
         markup.scan(TagAttributes) do |key, value|
-          @attributes[key] = Expression.parse(value)
+          @attributes[key] = value
         end
 
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.include")
+        raise SyntaxError.new(options[:locale].t("errors.syntax.include".freeze))
       end
     end
 
-    def parse(_tokens)
+    def parse(tokens)
     end
 
-    def render_to_output_buffer(context, output)
+    def blank?
-      template_name = context.evaluate(@template_name_expr)
+      false
-      raise ArgumentError, options[:locale].t("errors.argument.include") unless template_name
+    end
 
-      partial = PartialCache.load(
+    def render(context)
-        template_name,
+      partial = load_cached_partial(context)
-        context: context,
+      variable = context[@variable_name || @template_name[1..-2]]
-        parse_context: parse_context
-      )
 
-      context_variable_name = @alias_name || template_name.split('/').last
+      context.stack do
-
+        @attributes.each do |key, value|
-      variable = if @variable_name_expr
+          context[key] = context[value]
-        context.evaluate(@variable_name_expr)
-      else
-        context.find_variable(template_name, raise_on_not_found: false)
-      end
-
-      old_template_name = context.template_name
-      old_partial = context.partial
-      begin
-        context.template_name = template_name
-        context.partial = true
-        context.stack do
-          @attributes.each do |key, value|
-            context[key] = context.evaluate(value)
-          end
-
-          if variable.is_a?(Array)
-            variable.each do |var|
-              context[context_variable_name] = var
-              partial.render_to_output_buffer(context, output)
-            end
-          else
-            context[context_variable_name] = variable
-            partial.render_to_output_buffer(context, output)
-          end
         end
-      ensure
-        context.template_name = old_template_name
-        context.partial = old_partial
-      end
 
-      output
+        context_variable_name = @template_name[1..-2].split('/'.freeze).last
-    end
+        if variable.is_a?(Array)
-
+          variable.collect do |var|
-    alias_method :parse_context, :options
+            context[context_variable_name] = var
-    private :parse_context
+            partial.render(context)
-
+          end
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
+        else
-      def children
+          context[context_variable_name] = variable
-        [
+          partial.render(context)
-          @node.template_name_expr,
+        end
-          @node.variable_name_expr,
-        ] + @node.attributes.values
       end
     end
+
+    private
+      def load_cached_partial(context)
+        cached_partials = context.registers[:cached_partials] || {}
+        template_name = context[@template_name]
+
+        if cached = cached_partials[template_name]
+          return cached
+        end
+        source = read_template_from_file_system(context)
+        partial = Liquid::Template.parse(source)
+        cached_partials[template_name] = partial
+        context.registers[:cached_partials] = cached_partials
+        partial
+      end
+
+      def read_template_from_file_system(context)
+        file_system = context.registers[:file_system] || Liquid::Template.file_system
+
+        # make read_template_file call backwards-compatible.
+        case file_system.method(:read_template_file).arity
+        when 1
+          file_system.read_template_file(context[@template_name])
+        when 2
+          file_system.read_template_file(context[@template_name], context)
+        else
+          raise ArgumentError, "file_system.read_template_file expects two parameters: (template_name, context)"
+        end
+      end
   end
 
-  Template.register_tag('include', Include)
+  Template.register_tag('include'.freeze, Include)
 end

lib/liquid/tags/increment.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # increment is used in a place where one needs to insert a counter
   #     into a template, and needs the counter to survive across
@@ -22,14 +20,16 @@ module Liquid
       @variable = markup.strip
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
       value = context.environments.first[@variable] ||= 0
       context.environments.first[@variable] = value + 1
+      value.to_s
+    end
 
-      output << value.to_s
+    def blank?
-      output
+      false
     end
   end
 
-  Template.register_tag('increment', Increment)
+  Template.register_tag('increment'.freeze, Increment)
 end

lib/liquid/tags/raw.rb

@@ -1,50 +1,22 @@
-# frozen_string_literal: true
-
 module Liquid
   class Raw < Block
-    Syntax = /\A\s*\z/
     FullTokenPossiblyInvalid = /\A(.*)#{TagStart}\s*(\w+)\s*(.*)?#{TagEnd}\z/om
 
-    def initialize(tag_name, markup, parse_context)
-      super
-
-      ensure_valid_markup(tag_name, markup, parse_context)
-    end
-
     def parse(tokens)
-      @body = +''
+      @nodelist ||= []
-      while (token = tokens.shift)
+      @nodelist.clear
+      while token = tokens.shift
         if token =~ FullTokenPossiblyInvalid
-          @body << Regexp.last_match(1) if Regexp.last_match(1) != ""
+          @nodelist << $1 if $1 != "".freeze
-          return if block_delimiter == Regexp.last_match(2)
+          if block_delimiter == $2
+            end_tag
+            return
+          end
         end
-        @body << token unless token.empty?
+        @nodelist << token if not token.empty?
-      end
-
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
-    end
-
-    def render_to_output_buffer(_context, output)
-      output << @body
-      output
-    end
-
-    def nodelist
-      [@body]
-    end
-
-    def blank?
-      @body.empty?
-    end
-
-    protected
-
-    def ensure_valid_markup(tag_name, markup, parse_context)
-      unless Syntax.match?(markup)
-        raise SyntaxError, parse_context.locale.t("errors.syntax.tag_unexpected_args", tag: tag_name)
       end
     end
   end
 
-  Template.register_tag('raw', Raw)
+  Template.register_tag('raw'.freeze, Raw)
 end

lib/liquid/tags/render.rb

@@ -1,80 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Render < Tag
-    SYNTAX = /(#{QuotedString}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o
-
-    disable_tags "include"
-
-    attr_reader :template_name_expr, :attributes
-
-    def initialize(tag_name, markup, options)
-      super
-
-      raise SyntaxError, options[:locale].t("errors.syntax.render") unless markup =~ SYNTAX
-
-      template_name = Regexp.last_match(1)
-      variable_name = Regexp.last_match(3)
-
-      @alias_name = Regexp.last_match(5)
-      @variable_name_expr = variable_name ? Expression.parse(variable_name) : nil
-      @template_name_expr = Expression.parse(template_name)
-
-      @attributes = {}
-      markup.scan(TagAttributes) do |key, value|
-        @attributes[key] = Expression.parse(value)
-      end
-    end
-
-    def render_to_output_buffer(context, output)
-      render_tag(context, output)
-    end
-
-    def render_tag(context, output)
-      # Though we evaluate this here we will only ever parse it as a string literal.
-      template_name = context.evaluate(@template_name_expr)
-      raise ArgumentError, options[:locale].t("errors.argument.include") unless template_name
-
-      partial = PartialCache.load(
-        template_name,
-        context: context,
-        parse_context: parse_context
-      )
-
-      context_variable_name = @alias_name || template_name.split('/').last
-
-      render_partial_func = ->(var, forloop) {
-        inner_context = context.new_isolated_subcontext
-        inner_context.template_name = template_name
-        inner_context.partial = true
-        inner_context['forloop'] = forloop if forloop
-        @attributes.each do |key, value|
-          inner_context[key] = context.evaluate(value)
-        end
-        inner_context[context_variable_name] = var unless var.nil?
-        partial.render_to_output_buffer(inner_context, output)
-        forloop&.send(:increment!)
-      }
-
-      variable = @variable_name_expr ? context.evaluate(@variable_name_expr) : nil
-      if variable.is_a?(Array)
-        forloop = Liquid::ForloopDrop.new(template_name, variable.count, nil)
-        variable.each { |var| render_partial_func.call(var, forloop) }
-      else
-        render_partial_func.call(variable, nil)
-      end
-
-      output
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        [
-          @node.template_name_expr,
-        ] + @node.attributes.values
-      end
-    end
-  end
-
-  Template.register_tag('render', Render)
-end

lib/liquid/tags/table_row.rb

@@ -1,67 +1,73 @@
-# frozen_string_literal: true
-
 module Liquid
   class TableRow < Block
     Syntax = /(\w+)\s+in\s+(#{QuotedFragment}+)/o
 
-    attr_reader :variable_name, :collection_name, :attributes
-
     def initialize(tag_name, markup, options)
       super
       if markup =~ Syntax
-        @variable_name = Regexp.last_match(1)
+        @variable_name = $1
-        @collection_name = Expression.parse(Regexp.last_match(2))
+        @collection_name = $2
         @attributes = {}
         markup.scan(TagAttributes) do |key, value|
-          @attributes[key] = Expression.parse(value)
+          @attributes[key] = value
         end
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.table_row")
+        raise SyntaxError.new(options[:locale].t("errors.syntax.table_row".freeze))
       end
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
-      (collection = context.evaluate(@collection_name)) || (return '')
+      collection = context[@collection_name] or return ''.freeze
 
-      from = @attributes.key?('offset') ? context.evaluate(@attributes['offset']).to_i : 0
+      from = @attributes['offset'.freeze] ? context[@attributes['offset'.freeze]].to_i : 0
-      to = @attributes.key?('limit') ? from + context.evaluate(@attributes['limit']).to_i : nil
+      to = @attributes['limit'.freeze] ? from + context[@attributes['limit'.freeze]].to_i : nil
 
       collection = Utils.slice_collection(collection, from, to)
 
       length = collection.length
 
-      cols = context.evaluate(@attributes['cols']).to_i
+      cols = context[@attributes['cols'.freeze]].to_i
 
-      output << "<tr class=\"row1\">\n"
+      row = 1
+      col = 0
+
+      result = "<tr class=\"row1\">\n"
       context.stack do
-        tablerowloop = Liquid::TablerowloopDrop.new(length, cols)
-        context['tablerowloop'] = tablerowloop
 
-        collection.each do |item|
+        collection.each_with_index do |item, index|
           context[@variable_name] = item
+          context['tablerowloop'.freeze] = {
+            'length'.freeze    => length,
+            'index'.freeze     => index + 1,
+            'index0'.freeze    => index,
+            'col'.freeze       => col + 1,
+            'col0'.freeze      => col,
+            'index0'.freeze    => index,
+            'rindex'.freeze    => length - index,
+            'rindex0'.freeze   => length - index - 1,
+            'first'.freeze     => (index == 0),
+            'last'.freeze      => (index == length - 1),
+            'col_first'.freeze => (col == 0),
+            'col_last'.freeze  => (col == cols - 1)
+          }
 
-          output << "<td class=\"col#{tablerowloop.col}\">"
-          super
-          output << '</td>'
 
-          if tablerowloop.col_last && !tablerowloop.last
+          col += 1
-            output << "</tr>\n<tr class=\"row#{tablerowloop.row + 1}\">"
+
+          result << "<td class=\"col#{col}\">" << render_all(@nodelist, context) << '</td>'
+
+          if col == cols and (index != length - 1)
+            col  = 0
+            row += 1
+            result << "</tr>\n<tr class=\"row#{row}\">"
           end
 
-          tablerowloop.send(:increment!)
         end
       end
-
+      result << "</tr>\n"
-      output << "</tr>\n"
+      result
-      output
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        super + @node.attributes.values + [@node.collection_name]
-      end
     end
   end
 
-  Template.register_tag('tablerow', TableRow)
+  Template.register_tag('tablerow'.freeze, TableRow)
 end

lib/liquid/tags/unless.rb

@@ -1,30 +1,31 @@
-# frozen_string_literal: true
+require File.dirname(__FILE__) + '/if'
-
-require_relative 'if'
 
 module Liquid
   # Unless is a conditional just like 'if' but works on the inverse logic.
   #
-  #   {% unless x < 0 %} x is greater than zero {% endunless %}
+  #   {% unless x < 0 %} x is greater than zero {% end %}
   #
   class Unless < If
-    def render_to_output_buffer(context, output)
+    def render(context)
-      # First condition is interpreted backwards ( if not )
+      context.stack do
-      first_block = @blocks.first
-      unless first_block.evaluate(context)
-        return first_block.attachment.render_to_output_buffer(context, output)
-      end
 
-      # After the first condition unless works just like if
+        # First condition is interpreted backwards ( if not )
-      @blocks[1..-1].each do |block|
+        first_block = @blocks.first
-        if block.evaluate(context)
+        unless first_block.evaluate(context)
-          return block.attachment.render_to_output_buffer(context, output)
+          return render_all(first_block.attachment, context)
         end
-      end
 
-      output
+        # After the first condition unless works just like if
+        @blocks[1..-1].each do |block|
+          if block.evaluate(context)
+            return render_all(block.attachment, context)
+          end
+        end
+
+        ''.freeze
+      end
     end
   end
 
-  Template.register_tag('unless', Unless)
+  Template.register_tag('unless'.freeze, Unless)
 end

lib/liquid/template.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # Templates are central to liquid.
   # Interpretating templates is a two step process. First you compile the
   # source code you got. During compile time some extensive error checking is performed.
@@ -15,67 +14,14 @@ module Liquid
   #   template.render('user_name' => 'bob')
   #
   class Template
-    attr_accessor :root
+    DEFAULT_OPTIONS = {
-    attr_reader :resource_limits, :warnings
+      :locale => I18n.new
+    }
 
+    attr_accessor :root, :resource_limits
     @@file_system = BlankFileSystem.new
 
-    class TagRegistry
-      include Enumerable
-
-      def initialize
-        @tags = {}
-        @cache = {}
-      end
-
-      def [](tag_name)
-        return nil unless @tags.key?(tag_name)
-        return @cache[tag_name] if Liquid.cache_classes
-
-        lookup_class(@tags[tag_name]).tap { |o| @cache[tag_name] = o }
-      end
-
-      def []=(tag_name, klass)
-        @tags[tag_name]  = klass.name
-        @cache[tag_name] = klass
-      end
-
-      def delete(tag_name)
-        @tags.delete(tag_name)
-        @cache.delete(tag_name)
-      end
-
-      def each(&block)
-        @tags.each(&block)
-      end
-
-      private
-
-      def lookup_class(name)
-        Object.const_get(name)
-      end
-    end
-
-    attr_reader :profiler
-
     class << self
-      # Sets how strict the parser should be.
-      # :lax acts like liquid 2.5 and silently ignores malformed tags in most cases.
-      # :warn is the default and will give deprecation warnings when invalid syntax is used.
-      # :strict will enforce correct syntax.
-      attr_writer :error_mode
-
-      # Sets how strict the taint checker should be.
-      # :lax is the default, and ignores the taint flag completely
-      # :warn adds a warning, but does not interrupt the rendering
-      # :error raises an error when tainted output is used
-      attr_writer :taint_mode
-
-      attr_accessor :default_exception_renderer
-      Template.default_exception_renderer = lambda do |exception|
-        exception
-      end
-
       def file_system
         @@file_system
       end
@@ -89,23 +35,19 @@ module Liquid
       end
 
       def tags
-        @tags ||= TagRegistry.new
+        @tags ||= {}
       end
 
-      def add_register(name, klass)
+      # Sets how strict the parser should be.
-        registers[name.to_sym] = klass
+      # :lax acts like liquid 2.5 and silently ignores malformed tags in most cases.
-      end
+      # :warn is the default and will give deprecation warnings when invalid syntax is used.
-
+      # :strict will enforce correct syntax.
-      def registers
+      def error_mode=(mode)
-        @registers ||= {}
+        @error_mode = mode
       end
 
       def error_mode
-        @error_mode ||= :lax
+        @error_mode || :lax
-      end
-
-      def taint_mode
-        @taint_mode ||= :lax
       end
 
       # Pass a module with filter methods which should be available
@@ -114,36 +56,32 @@ module Liquid
         Strainer.global_filter(mod)
       end
 
-      def default_resource_limits
-        @default_resource_limits ||= {}
-      end
-
       # creates a new <tt>Template</tt> object from liquid source code
-      # To enable profiling, pass in <tt>profile: true</tt> as an option.
-      # See Liquid::Profiler for more information
       def parse(source, options = {})
         template = Template.new
         template.parse(source, options)
+        template
       end
     end
 
+    # creates a new <tt>Template</tt> from an array of tokens. Use <tt>Template.parse</tt> instead
     def initialize
-      @rethrow_errors = false
+      @resource_limits = {}
-      @resource_limits = ResourceLimits.new(self.class.default_resource_limits)
     end
 
     # Parse source code.
     # Returns self for easy chaining
     def parse(source, options = {})
-      @options = options
+      @root = Document.parse(tokenize(source), DEFAULT_OPTIONS.merge(options))
-      @profiling = options[:profile]
+      @warnings = nil
-      @line_numbers = options[:line_numbers] || @profiling
-      parse_context = options.is_a?(ParseContext) ? options : ParseContext.new(options)
-      @root = Document.parse(tokenize(source), parse_context)
-      @warnings = parse_context.warnings
       self
     end
 
+    def warnings
+      return [] unless @root
+      @warnings ||= @root.warnings
+    end
+
     def registers
       @registers ||= {}
     end
@@ -165,9 +103,6 @@ module Liquid
     # if you use the same filters over and over again consider registering them globally
     # with <tt>Template.register_filter</tt>
     #
-    # if profiling was enabled in <tt>Template#parse</tt> then the resulting profiling information
-    # will be available via <tt>Template#profiler</tt>
-    #
     # Following options can be passed:
     #
     #  * <tt>filters</tt> : array with local filters
@@ -175,17 +110,11 @@ module Liquid
     #    filters and tags and might be useful to integrate liquid more with its host application
     #
     def render(*args)
-      return '' if @root.nil?
+      return ''.freeze if @root.nil?
 
       context = case args.first
       when Liquid::Context
-        c = args.shift
+        args.shift
-
-        if @rethrow_errors
-          c.exception_renderer = ->(_e) { raise }
-        end
-
-        c
       when Liquid::Drop
         drop = args.shift
         drop.context = Context.new([drop, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
@@ -197,37 +126,29 @@ module Liquid
         raise ArgumentError, "Expected Hash or Liquid::Context as parameter"
       end
 
-      output = nil
-
-      context_register = context.registers.is_a?(StaticRegisters) ? context.registers.static : context.registers
-
       case args.last
       when Hash
         options = args.pop
-        output = options[:output] if options[:output]
 
-        options[:registers]&.each do |key, register|
+        if options[:registers].is_a?(Hash)
-          context_register[key] = register
+          self.registers.merge!(options[:registers])
         end
 
-        apply_options_to_context(context, options)
+        if options[:filters]
-      when Module, Array
+          context.add_filters(options[:filters])
+        end
+
+      when Module
+        context.add_filters(args.pop)
+      when Array
         context.add_filters(args.pop)
       end
 
-      Template.registers.each do |key, register|
-        context_register[key] = register
-      end
-
-      # Retrying a render resets resource usage
-      context.resource_limits.reset
-
       begin
         # render the nodelist.
         # for performance reasons we get an array back here. join will make a string out of it.
-        with_profiling(context) do
+        result = @root.render(context)
-          @root.render_to_output_buffer(context, output || +'')
+        result.respond_to?(:join) ? result.join : result
-        end
       rescue Liquid::MemoryError => e
         context.handle_error(e)
       ensure
@@ -236,43 +157,15 @@ module Liquid
     end
 
     def render!(*args)
-      @rethrow_errors = true
+      @rethrow_errors = true; render(*args)
-      render(*args)
-    end
-
-    def render_to_output_buffer(context, output)
-      render(context, output: output)
     end
 
     private
 
     def tokenize(source)
-      Tokenizer.new(source, @line_numbers)
+      source = source.source if source.respond_to?(:source)
+      Tokenizer.new(source.to_s)
     end
 
-    def with_profiling(context)
-      if @profiling && !context.partial
-        raise "Profiler not loaded, require 'liquid/profiler' first" unless defined?(Liquid::Profiler)
-
-        @profiler = Profiler.new(context.template_name)
-        @profiler.start
-
-        begin
-          yield
-        ensure
-          @profiler.stop
-        end
-      else
-        yield
-      end
-    end
-
-    def apply_options_to_context(context, options)
-      context.add_filters(options[:filters]) if options[:filters]
-      context.global_filter = options[:global_filter] if options[:global_filter]
-      context.exception_renderer = options[:exception_renderer] if options[:exception_renderer]
-      context.strict_variables = options[:strict_variables] if options[:strict_variables]
-      context.strict_filters = options[:strict_filters] if options[:strict_filters]
-    end
   end
 end

lib/liquid/tokenizer.rb

@@ -1,39 +1,20 @@
-# frozen_string_literal: true
-
 module Liquid
   class Tokenizer
-    attr_reader :line_number, :for_liquid_tag
+    VariableIncompleteEnd = /\}\}?/
+    AnyStartingTag        = /\{\{|\{\%/
+    PartialTemplateParser = /#{TagStart}.*?#{TagEnd}|#{VariableStart}.*?#{VariableIncompleteEnd}/om
+    TemplateParser        = /(#{PartialTemplateParser}|#{AnyStartingTag})/om
 
-    def initialize(source, line_numbers = false, line_number: nil, for_liquid_tag: false)
+    def initialize(source)
-      @source = source
+      @tokens = source.split(TemplateParser)
-      @line_number = line_number || (line_numbers ? 1 : nil)
-      @for_liquid_tag = for_liquid_tag
-      @tokens = tokenize
-    end
-
-    def shift
-      (token = @tokens.shift) || return
-
-      if @line_number
-        @line_number += @for_liquid_tag ? 1 : token.count("\n")
-      end
-
-      token
-    end
-
-    private
-
-    def tokenize
-      return [] if @source.to_s.empty?
-
-      return @source.split("\n") if @for_liquid_tag
-
-      tokens = @source.split(TemplateParser)
 
       # removes the rogue empty element at the beginning of the array
-      tokens.shift if tokens[0]&.empty?
+      @tokens.shift if @tokens[0] && @tokens[0].empty?
-
-      tokens
     end
+
+    def next
+      @tokens.shift
+    end
+    alias_method :shift, :next
   end
 end

lib/liquid/usage.rb

@@ -1,8 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  module Usage
-    def self.increment(name)
-    end
-  end
-end

lib/liquid/utils.rb

@@ -1,26 +1,27 @@
-# frozen_string_literal: true
-
 module Liquid
   module Utils
+
     def self.slice_collection(collection, from, to)
-      if (from != 0 || !to.nil?) && collection.respond_to?(:load_slice)
+      if (from != 0 || to != nil) && collection.respond_to?(:load_slice)
         collection.load_slice(from, to)
       else
         slice_collection_using_each(collection, from, to)
       end
     end
 
+    def self.non_blank_string?(collection)
+      collection.is_a?(String) && collection != ''.freeze
+    end
+
     def self.slice_collection_using_each(collection, from, to)
       segments = []
       index = 0
 
       # Maintains Ruby 1.8.7 String#each behaviour on 1.9
-      if collection.is_a?(String)
+      return [collection] if non_blank_string?(collection)
-        return collection.empty? ? [] : [collection]
-      end
-      return [] unless collection.respond_to?(:each)
 
       collection.each do |item|
+
         if to && to <= index
           break
         end
@@ -34,52 +35,5 @@ module Liquid
 
       segments
     end
-
-    def self.to_integer(num)
-      return num if num.is_a?(Integer)
-      num = num.to_s
-      begin
-        Integer(num)
-      rescue ::ArgumentError
-        raise Liquid::ArgumentError, "invalid integer"
-      end
-    end
-
-    def self.to_number(obj)
-      case obj
-      when Float
-        BigDecimal(obj.to_s)
-      when Numeric
-        obj
-      when String
-        /\A-?\d+\.\d+\z/.match?(obj.strip) ? BigDecimal(obj) : obj.to_i
-      else
-        if obj.respond_to?(:to_number)
-          obj.to_number
-        else
-          0
-        end
-      end
-    end
-
-    def self.to_date(obj)
-      return obj if obj.respond_to?(:strftime)
-
-      if obj.is_a?(String)
-        return nil if obj.empty?
-        obj = obj.downcase
-      end
-
-      case obj
-      when 'now', 'today'
-        Time.now
-      when /\A\d+\z/, Integer
-        Time.at(obj.to_i)
-      when String
-        Time.parse(obj)
-      end
-    rescue ::ArgumentError
-      nil
-    end
   end
 end

lib/liquid/variable.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # Holds variables. Variables are only loaded "just in time"
   # and are not evaluated as part of the render stage
   #
@@ -12,158 +11,97 @@ module Liquid
   #   {{ user | link }}
   #
   class Variable
-    FilterMarkupRegex = /#{FilterSeparator}\s*(.*)/om
+    FilterParser = /(?:#{FilterSeparator}|(?:\s*(?:#{QuotedFragment}|#{ArgumentSeparator})\s*)+)/o
-    FilterParser = /(?:\s+|#{QuotedFragment}|#{ArgumentSeparator})+/o
+    EasyParse = /\A *(\w+(?:\.\w+)*) *\z/
-    FilterArgsRegex = /(?:#{FilterArgumentSeparator}|#{ArgumentSeparator})\s*((?:\w+\s*\:\s*)?#{QuotedFragment})/o
+    attr_accessor :filters, :name, :warnings
-    JustTagAttributes = /\A#{TagAttributes}\z/o
-    MarkupWithQuotedFragment = /(#{QuotedFragment})(.*)/om
 
-    attr_accessor :filters, :name, :line_number
+    def initialize(markup, options = {})
-    attr_reader :parse_context
-    alias_method :options, :parse_context
-
-    include ParserSwitching
-
-    def initialize(markup, parse_context)
       @markup  = markup
       @name    = nil
-      @parse_context = parse_context
+      @options = options || {}
-      @line_number = parse_context.line_number
 
-      parse_with_selected_parser(markup)
+      case @options[:error_mode] || Template.error_mode
-    end
+      when :strict then strict_parse(markup)
-
+      when :lax    then lax_parse(markup)
-    def raw
+      when :warn
-      @markup
+        begin
-    end
+          strict_parse(markup)
-
+        rescue SyntaxError => e
-    def markup_context(markup)
+          @warnings ||= []
-      "in \"{{#{markup}}}\""
+          @warnings << e
+          lax_parse(markup)
+        end
+      end
     end
 
     def lax_parse(markup)
       @filters = []
-      return unless markup =~ MarkupWithQuotedFragment
+      if match = markup.match(/\s*(#{QuotedFragment})(.*)/om)
-
+        @name = match[1]
-      name_markup = Regexp.last_match(1)
+        if match[2].match(/#{FilterSeparator}\s*(.*)/om)
-      filter_markup = Regexp.last_match(2)
+          filters = Regexp.last_match(1).scan(FilterParser)
-      @name = Expression.parse(name_markup)
+          filters.each do |f|
-      if filter_markup =~ FilterMarkupRegex
+            if matches = f.match(/\s*(\w+)/)
-        filters = Regexp.last_match(1).scan(FilterParser)
+              filtername = matches[1]
-        filters.each do |f|
+              filterargs = f.scan(/(?:#{FilterArgumentSeparator}|#{ArgumentSeparator})\s*((?:\w+\s*\:\s*)?#{QuotedFragment})/o).flatten
-          next unless f =~ /\w+/
+              @filters << [filtername, filterargs]
-          filtername = Regexp.last_match(0)
+            end
-          filterargs = f.scan(FilterArgsRegex).flatten
+          end
-          @filters << parse_filter_expressions(filtername, filterargs)
         end
       end
     end
 
     def strict_parse(markup)
+      # Very simple valid cases
+      if markup =~ EasyParse
+        @name = $1
+        @filters = []
+        return
+      end
+
       @filters = []
       p = Parser.new(markup)
-
+      # Could be just filters with no input
-      @name = Expression.parse(p.expression)
+      @name = p.look(:pipe) ? ''.freeze : p.expression
       while p.consume?(:pipe)
         filtername = p.consume(:id)
         filterargs = p.consume?(:colon) ? parse_filterargs(p) : []
-        @filters << parse_filter_expressions(filtername, filterargs)
+        @filters << [filtername, filterargs]
       end
       p.consume(:end_of_string)
+    rescue SyntaxError => e
+      e.message << " in \"{{#{markup}}}\""
+      raise e
     end
 
     def parse_filterargs(p)
       # first argument
       filterargs = [p.argument]
       # followed by comma separated others
-      filterargs << p.argument while p.consume?(:comma)
+      while p.consume?(:comma)
+        filterargs << p.argument
+      end
       filterargs
     end
 
     def render(context)
-      obj = @filters.inject(context.evaluate(@name)) do |output, (filter_name, filter_args, filter_kwargs)|
+      return ''.freeze if @name.nil?
-        filter_args = evaluate_filter_expressions(context, filter_args, filter_kwargs)
+      @filters.inject(context[@name]) do |output, filter|
-        context.invoke(filter_name, output, *filter_args)
+        filterargs = []
-      end
+        keyword_args = {}
-
+        filter[1].to_a.each do |a|
-      obj = context.apply_global_filter(obj)
+          if matches = a.match(/\A#{TagAttributes}\z/o)
-      taint_check(context, obj)
+            keyword_args[matches[1]] = context[matches[2]]
-      obj
+          else
-    end
+            filterargs << context[a]
-
+          end
-    def render_to_output_buffer(context, output)
-      obj = render(context)
-
-      if obj.is_a?(Array)
-        output << obj.join
-      elsif obj.nil?
-      else
-        output << obj.to_s
-      end
-
-      output
-    end
-
-    def disabled?(_context)
-      false
-    end
-
-    def disabled_tags
-      []
-    end
-
-    private
-
-    def parse_filter_expressions(filter_name, unparsed_args)
-      filter_args = []
-      keyword_args = nil
-      unparsed_args.each do |a|
-        if (matches = a.match(JustTagAttributes))
-          keyword_args ||= {}
-          keyword_args[matches[1]] = Expression.parse(matches[2])
-        else
-          filter_args << Expression.parse(a)
         end
-      end
+        filterargs << keyword_args unless keyword_args.empty?
-      result = [filter_name, filter_args]
+        begin
-      result << keyword_args if keyword_args
+          output = context.invoke(filter[0], output, *filterargs)
-      result
+        rescue FilterNotFound
-    end
+          raise FilterNotFound, "Error - filter '#{filter[0]}' in '#{@markup.strip}' could not be found."
-
-    def evaluate_filter_expressions(context, filter_args, filter_kwargs)
-      parsed_args = filter_args.map { |expr| context.evaluate(expr) }
-      if filter_kwargs
-        parsed_kwargs = {}
-        filter_kwargs.each do |key, expr|
-          parsed_kwargs[key] = context.evaluate(expr)
         end
-        parsed_args << parsed_kwargs
-      end
-      parsed_args
-    end
-
-    def taint_check(context, obj)
-      return unless obj.tainted?
-      return if Template.taint_mode == :lax
-
-      @markup =~ QuotedFragment
-      name = Regexp.last_match(0)
-
-      error = TaintedError.new("variable '#{name}' is tainted and was not escaped")
-      error.line_number = line_number
-      error.template_name = context.template_name
-
-      case Template.taint_mode
-      when :warn
-        context.warnings << error
-      when :error
-        raise error
-      end
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        [@node.name] + @node.filters.flatten
       end
     end
   end

lib/liquid/variable_lookup.rb

@@ -1,90 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class VariableLookup
-    SQUARE_BRACKETED = /\A\[(.*)\]\z/m
-    COMMAND_METHODS = ['size', 'first', 'last'].freeze
-
-    attr_reader :name, :lookups
-
-    def self.parse(markup)
-      new(markup)
-    end
-
-    def initialize(markup)
-      lookups = markup.scan(VariableParser)
-
-      name = lookups.shift
-      if name =~ SQUARE_BRACKETED
-        name = Expression.parse(Regexp.last_match(1))
-      end
-      @name = name
-
-      @lookups = lookups
-      @command_flags = 0
-
-      @lookups.each_index do |i|
-        lookup = lookups[i]
-        if lookup =~ SQUARE_BRACKETED
-          lookups[i] = Expression.parse(Regexp.last_match(1))
-        elsif COMMAND_METHODS.include?(lookup)
-          @command_flags |= 1 << i
-        end
-      end
-    end
-
-    def evaluate(context)
-      name = context.evaluate(@name)
-      object = context.find_variable(name)
-
-      @lookups.each_index do |i|
-        key = context.evaluate(@lookups[i])
-
-        # If object is a hash- or array-like object we look for the
-        # presence of the key and if its available we return it
-        if object.respond_to?(:[]) &&
-            ((object.respond_to?(:key?) && object.key?(key)) ||
-             (object.respond_to?(:fetch) && key.is_a?(Integer)))
-
-          # if its a proc we will replace the entry with the proc
-          res = context.lookup_and_evaluate(object, key)
-          object = res.to_liquid
-
-          # Some special cases. If the part wasn't in square brackets and
-          # no key with the same name was found we interpret following calls
-          # as commands and call them on the current object
-        elsif @command_flags & (1 << i) != 0 && object.respond_to?(key)
-          object = object.send(key).to_liquid
-
-          # No key was present with the desired value and it wasn't one of the directly supported
-          # keywords either. The only thing we got left is to return nil or
-          # raise an exception if `strict_variables` option is set to true
-        else
-          return nil unless context.strict_variables
-          raise Liquid::UndefinedVariable, "undefined variable #{key}"
-        end
-
-        # If we are dealing with a drop here we have to
-        object.context = context if object.respond_to?(:context=)
-      end
-
-      object
-    end
-
-    def ==(other)
-      self.class == other.class && state == other.state
-    end
-
-    protected
-
-    def state
-      [@name, @lookups, @command_flags]
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        @node.lookups
-      end
-    end
-  end
-end

lib/liquid/version.rb

@@ -1,6 +1,4 @@
 # encoding: utf-8
-# frozen_string_literal: true
-
 module Liquid
-  VERSION = "4.0.3"
+  VERSION = "3.0.0".freeze
 end

liquid.gemspec

@@ -1,8 +1,6 @@
 # encoding: utf-8
-# frozen_string_literal: true
-
 lib = File.expand_path('../lib/', __FILE__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+$:.unshift lib unless $:.include?(lib)
 
 require "liquid/version"
 
@@ -11,22 +9,26 @@ Gem::Specification.new do |s|
   s.version     = Liquid::VERSION
   s.platform    = Gem::Platform::RUBY
   s.summary     = "A secure, non-evaling end user template engine with aesthetic markup."
-  s.authors     = ["Tobias Lütke"]
+  s.authors     = ["Tobias Luetke"]
   s.email       = ["tobi@leetsoft.com"]
   s.homepage    = "http://www.liquidmarkup.org"
   s.license     = "MIT"
-  # s.description = "A secure, non-evaling end user template engine with aesthetic markup."
+  #s.description = "A secure, non-evaling end user template engine with aesthetic markup."
 
-  s.required_ruby_version     = ">= 2.4.0"
   s.required_rubygems_version = ">= 1.3.7"
 
   s.test_files  = Dir.glob("{test}/**/*")
-  s.files       = Dir.glob("{lib}/**/*") + %w(LICENSE README.md)
+  s.files       = Dir.glob("{lib,ext}/**/*") + %w(MIT-LICENSE README.md)
 
-  s.extra_rdoc_files = ["History.md", "README.md"]
+  s.extra_rdoc_files  = ["History.md", "README.md"]
 
   s.require_path = "lib"
 
-  s.add_development_dependency('rake', '~> 11.3')
+  s.add_development_dependency 'rake'
-  s.add_development_dependency('minitest')
+  s.add_development_dependency 'activesupport'
+  if defined?(RUBY_ENGINE) && RUBY_ENGINE == 'ruby'
+    s.extensions  = ['ext/liquid/extconf.rb']
+    s.add_development_dependency 'rake-compiler'
+    s.add_development_dependency 'stackprof' if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("2.1.0")
+  end
 end

performance/benchmark.rb

@@ -1,20 +1,12 @@
-# frozen_string_literal: true
+require 'rubygems'
-
+require 'benchmark'
-require 'benchmark/ips'
+require File.dirname(__FILE__) + '/theme_runner'
-require_relative 'theme_runner'
 
 Liquid::Template.error_mode = ARGV.first.to_sym if ARGV.first
 profiler = ThemeRunner.new
 
-Benchmark.ips do |x|
+Benchmark.bmbm do |x|
-  x.time = 10
+  x.report("parse:")   { 100.times { profiler.compile } }
-  x.warmup = 5
+  x.report("parse & run:")   { 100.times { profiler.run } }
-
-  puts
-  puts "Running benchmark for #{x.time} seconds (with #{x.warmup} seconds warmup)."
-  puts
-
-  x.report("parse:") { profiler.compile }
-  x.report("render:") { profiler.render }
-  x.report("parse & render:") { profiler.run }
 end
+

performance/memory_profile.rb

@@ -1,63 +0,0 @@
-# frozen_string_literal: true
-
-require 'benchmark/ips'
-require 'memory_profiler'
-require 'terminal-table'
-require_relative 'theme_runner'
-
-class Profiler
-  LOG_LABEL   = "Profiling: ".rjust(14).freeze
-  REPORTS_DIR = File.expand_path('.memprof', __dir__).freeze
-
-  def self.run
-    puts
-    yield new
-  end
-
-  def initialize
-    @allocated = []
-    @retained  = []
-    @headings  = []
-  end
-
-  def profile(phase, &block)
-    print(LOG_LABEL)
-    print("#{phase}.. ".ljust(10))
-    report = MemoryProfiler.report(&block)
-    puts 'Done.'
-    @headings  << phase.capitalize
-    @allocated << "#{report.scale_bytes(report.total_allocated_memsize)} (#{report.total_allocated} objects)"
-    @retained  << "#{report.scale_bytes(report.total_retained_memsize)} (#{report.total_retained} objects)"
-
-    return if ENV['CI']
-
-    require 'fileutils'
-    report_file = File.join(REPORTS_DIR, "#{sanitize(phase)}.txt")
-    FileUtils.mkdir_p(REPORTS_DIR)
-    report.pretty_print(to_file: report_file, scale_bytes: true)
-  end
-
-  def tabulate
-    table = Terminal::Table.new(headings: @headings.unshift('Phase')) do |t|
-      t << @allocated.unshift('Total allocated')
-      t << @retained.unshift('Total retained')
-    end
-
-    puts
-    puts table
-    puts "\nDetailed report(s) saved to #{REPORTS_DIR}/" unless ENV['CI']
-  end
-
-  def sanitize(string)
-    string.downcase.gsub(/[\W]/, '-').squeeze('-')
-  end
-end
-
-Liquid::Template.error_mode = ARGV.first.to_sym if ARGV.first
-
-runner = ThemeRunner.new
-Profiler.run do |x|
-  x.profile('parse') { runner.compile }
-  x.profile('render') { runner.render }
-  x.tabulate
-end

performance/profile.rb

@@ -1,26 +1,13 @@
-# frozen_string_literal: true
+require 'stackprof' rescue fail("install stackprof extension/gem")
-
+require File.dirname(__FILE__) + '/theme_runner'
-require 'stackprof'
-require_relative 'theme_runner'
 
 Liquid::Template.error_mode = ARGV.first.to_sym if ARGV.first
 profiler = ThemeRunner.new
 profiler.run
-
+results = StackProf.run(mode: :cpu) do
-[:cpu, :object].each do |profile_type|
+  100.times do
-  puts "Profiling in #{profile_type} mode..."
+    profiler.run
-  results = StackProf.run(mode: profile_type) do
-    200.times do
-      profiler.run
-    end
   end
-
-  if profile_type == :cpu && (graph_filename = ENV['GRAPH_FILENAME'])
-    File.open(graph_filename, 'w') do |f|
-      StackProf::Report.new(results).print_graphviz(nil, f)
-    end
-  end
-
-  StackProf::Report.new(results).print_text(false, 20)
-  File.write(ENV['FILENAME'] + "." + profile_type.to_s, Marshal.dump(results)) if ENV['FILENAME']
 end
+StackProf::Report.new(results).print_text(false, 20)
+File.write(ENV['FILENAME'], Marshal.dump(results)) if ENV['FILENAME']

performance/shopify/comment_form.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class CommentForm < Liquid::Block
   Syntax = /(#{Liquid::VariableSignature}+)/
 
@@ -7,14 +5,14 @@ class CommentForm < Liquid::Block
     super
 
     if markup =~ Syntax
-      @variable_name = Regexp.last_match(1)
+      @variable_name = $1
       @attributes = {}
     else
-      raise SyntaxError, "Syntax Error in 'comment_form' - Valid syntax: comment_form [article]"
+      raise SyntaxError.new("Syntax Error in 'comment_form' - Valid syntax: comment_form [article]")
     end
   end
 
-  def render_to_output_buffer(context, output)
+  def render(context)
     article = context[@variable_name]
 
     context.stack do
@@ -22,16 +20,14 @@ class CommentForm < Liquid::Block
         'posted_successfully?' => context.registers[:posted_successfully],
         'errors' => context['comment.errors'],
         'author' => context['comment.author'],
-        'email' => context['comment.email'],
+        'email'  => context['comment.email'],
-        'body' => context['comment.body'],
+        'body'   => context['comment.body']
       }
-
+      wrap_in_form(article, render_all(@nodelist, context))
-      output << wrap_in_form(article, render_all(@nodelist, context, output))
-      output
     end
   end
 
   def wrap_in_form(article, input)
-    %(<form id="article-#{article.id}-comment-form" class="comment-form" method="post" action="">\n#{input}\n</form>)
+    %Q{<form id="article-#{article.id}-comment-form" class="comment-form" method="post" action="">\n#{input}\n</form>}
   end
 end

performance/shopify/database.rb

@@ -1,13 +1,11 @@
-# frozen_string_literal: true
-
 require 'yaml'
-
 module Database
+
   # Load the standard vision toolkit database and re-arrage it to be simply exportable
   # to liquid as assigns. All this is based on Shopify
   def self.tables
     @tables ||= begin
-      db = YAML.load_file("#{__dir__}/vision.database.yml")
+      db = YAML.load_file(File.dirname(__FILE__) + '/vision.database.yml')
 
       # From vision source
       db['products'].each do |product|
@@ -18,10 +16,9 @@ module Database
       end
 
       # key the tables by handles, as this is how liquid expects it.
-      db = db.each_with_object({}) do |(key, values), assigns|
+      db = db.inject({}) do |assigns, (key, values)|
-        assigns[key] = values.each_with_object({}) do |v, h|
+        assigns[key] = values.inject({}) { |h, v| h[v['handle']] = v; h; }
-          h[v['handle']] = v
+        assigns
-        end
       end
 
       # Some standard direct accessors so that the specialized templates
@@ -32,9 +29,9 @@ module Database
       db['article']    = db['blog']['articles'].first
 
       db['cart']       = {
-        'total_price' => db['line_items'].values.inject(0) { |sum, item| sum + item['line_price'] * item['quantity'] },
+        'total_price' => db['line_items'].values.inject(0) { |sum, item| sum += item['line_price'] * item['quantity'] },
-        'item_count' => db['line_items'].values.inject(0) { |sum, item| sum + item['quantity'] },
+        'item_count'  => db['line_items'].values.inject(0) { |sum, item| sum += item['quantity'] },
-        'items' => db['line_items'].values,
+        'items'       => db['line_items'].values
       }
 
       db
@@ -42,7 +39,7 @@ module Database
   end
 end
 
-if __FILE__ == $PROGRAM_NAME
+if __FILE__ == $0
-  p(Database.tables['collections']['frontpage'].keys)
+  p Database.tables['collections']['frontpage'].keys
-  # p Database.tables['blog']['articles']
+  #p Database.tables['blog']['articles']
 end

performance/shopify/json_filter.rb

@@ -1,9 +1,7 @@
-# frozen_string_literal: true
-
-require 'json'
-
 module JsonFilter
+
   def json(object)
-    JSON.dump(object.reject { |k, _v| k == "collections" })
+    object.reject {|k,v| k == "collections" }.to_json
   end
+
 end

performance/shopify/liquid.rb

@@ -1,21 +1,19 @@
-# frozen_string_literal: true
+$:.unshift File.dirname(__FILE__) + '/../../lib'
+require File.dirname(__FILE__) + '/../../lib/liquid'
 
-$LOAD_PATH.unshift(__dir__ + '/../../lib')
+require File.dirname(__FILE__) + '/comment_form'
-require_relative '../../lib/liquid'
+require File.dirname(__FILE__) + '/paginate'
+require File.dirname(__FILE__) + '/json_filter'
+require File.dirname(__FILE__) + '/money_filter'
+require File.dirname(__FILE__) + '/shop_filter'
+require File.dirname(__FILE__) + '/tag_filter'
+require File.dirname(__FILE__) + '/weight_filter'
 
-require_relative 'comment_form'
+Liquid::Template.register_tag 'paginate', Paginate
-require_relative 'paginate'
+Liquid::Template.register_tag 'form', CommentForm
-require_relative 'json_filter'
-require_relative 'money_filter'
-require_relative 'shop_filter'
-require_relative 'tag_filter'
-require_relative 'weight_filter'
 
-Liquid::Template.register_tag('paginate', Paginate)
+Liquid::Template.register_filter JsonFilter
-Liquid::Template.register_tag('form', CommentForm)
+Liquid::Template.register_filter MoneyFilter
-
+Liquid::Template.register_filter WeightFilter
-Liquid::Template.register_filter(JsonFilter)
+Liquid::Template.register_filter ShopFilter
-Liquid::Template.register_filter(MoneyFilter)
+Liquid::Template.register_filter TagFilter
-Liquid::Template.register_filter(WeightFilter)
-Liquid::Template.register_filter(ShopFilter)
-Liquid::Template.register_filter(TagFilter)

performance/shopify/money_filter.rb

@@ -1,14 +1,13 @@
-# frozen_string_literal: true
-
 module MoneyFilter
+
   def money_with_currency(money)
     return '' if money.nil?
-    format("$ %.2f USD", money / 100.0)
+    sprintf("$ %.2f USD", money/100.0)
   end
 
   def money(money)
     return '' if money.nil?
-    format("$ %.2f", money / 100.0)
+    sprintf("$ %.2f", money/100.0)
   end
 
   private

performance/shopify/paginate.rb

@@ -1,15 +1,15 @@
-# frozen_string_literal: true
-
 class Paginate < Liquid::Block
-  Syntax = /(#{Liquid::QuotedFragment})\s*(by\s*(\d+))?/
+  Syntax     = /(#{Liquid::QuotedFragment})\s*(by\s*(\d+))?/
 
   def initialize(tag_name, markup, options)
     super
 
+    @nodelist = []
+
     if markup =~ Syntax
-      @collection_name = Regexp.last_match(1)
+      @collection_name = $1
-      @page_size = if Regexp.last_match(2)
+      @page_size = if $2
-        Regexp.last_match(3).to_i
+        $3.to_i
       else
         20
       end
@@ -19,47 +19,48 @@ class Paginate < Liquid::Block
         @attributes[key] = value
       end
     else
-      raise SyntaxError, "Syntax Error in tag 'paginate' - Valid syntax: paginate [collection] by number"
+      raise SyntaxError.new("Syntax Error in tag 'paginate' - Valid syntax: paginate [collection] by number")
     end
   end
 
-  def render_to_output_buffer(context, output)
+  def render(context)
     @context = context
 
     context.stack do
-      current_page = context['current_page'].to_i
+      current_page  = context['current_page'].to_i
 
       pagination = {
-        'page_size' => @page_size,
+        'page_size'      => @page_size,
-        'current_page' => 5,
+        'current_page'   => 5,
-        'current_offset' => @page_size * 5,
+        'current_offset' => @page_size * 5
       }
 
       context['paginate'] = pagination
 
-      collection_size = context[@collection_name].size
+      collection_size  = context[@collection_name].size
 
-      raise ArgumentError, "Cannot paginate array '#{@collection_name}'. Not found." if collection_size.nil?
+      raise ArgumentError.new("Cannot paginate array '#{@collection_name}'. Not found.") if collection_size.nil?
 
       page_count = (collection_size.to_f / @page_size.to_f).to_f.ceil + 1
 
       pagination['items']      = collection_size
-      pagination['pages']      = page_count - 1
+      pagination['pages']      = page_count -1
-      pagination['previous']   = link('&laquo; Previous', current_page - 1)  unless 1 >= current_page
+      pagination['previous']   = link('&laquo; Previous', current_page-1 )  unless 1 >= current_page
-      pagination['next']       = link('Next &raquo;', current_page + 1)      unless page_count <= current_page + 1
+      pagination['next']       = link('Next &raquo;', current_page+1 )      unless page_count <= current_page+1
       pagination['parts']      = []
 
       hellip_break = false
 
       if page_count > 2
-        1.upto(page_count - 1) do |page|
+        1.upto(page_count-1) do |page|
+
           if current_page == page
             pagination['parts'] << no_link(page)
           elsif page == 1
             pagination['parts'] << link(page, page)
-          elsif page == page_count - 1
+          elsif page == page_count -1
             pagination['parts'] << link(page, page)
-          elsif page <= current_page - @attributes['window_size'] || page >= current_page + @attributes['window_size']
+          elsif page <= current_page - @attributes['window_size'] or page >= current_page + @attributes['window_size']
             next if hellip_break
             pagination['parts'] << no_link('&hellip;')
             hellip_break = true
@@ -72,18 +73,18 @@ class Paginate < Liquid::Block
         end
       end
 
-      super
+      render_all(@nodelist, context)
     end
   end
 
   private
 
   def no_link(title)
-    { 'title' => title, 'is_link' => false }
+    { 'title' => title, 'is_link' => false}
   end
 
   def link(title, page)
-    { 'title' => title, 'url' => current_url + "?page=#{page}", 'is_link' => true }
+    { 'title' => title, 'url' => current_url + "?page=#{page}", 'is_link' => true}
   end
 
   def current_url

performance/shopify/shop_filter.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module ShopFilter
+
   def asset_url(input)
     "/files/1/[shop_id]/[shop_id]/assets/#{input}"
   end
@@ -17,21 +16,21 @@ module ShopFilter
     %(<script src="#{url}" type="text/javascript"></script>)
   end
 
-  def stylesheet_tag(url, media = "all")
+  def stylesheet_tag(url, media="all")
     %(<link href="#{url}" rel="stylesheet" type="text/css"  media="#{media}"  />)
   end
 
-  def link_to(link, url, title = "")
+  def link_to(link, url, title="")
-    %(<a href="#{url}" title="#{title}">#{link}</a>)
+    %|<a href="#{url}" title="#{title}">#{link}</a>|
   end
 
-  def img_tag(url, alt = "")
+  def img_tag(url, alt="")
-    %(<img src="#{url}" alt="#{alt}" />)
+    %|<img src="#{url}" alt="#{alt}" />|
   end
 
   def link_to_vendor(vendor)
     if vendor
-      link_to(vendor, url_for_vendor(vendor), vendor)
+      link_to vendor, url_for_vendor(vendor), vendor
     else
       'Unknown Vendor'
     end
@@ -39,7 +38,7 @@ module ShopFilter
 
   def link_to_type(type)
     if type
-      link_to(type, url_for_type(type), type)
+      link_to type, url_for_type(type), type
     else
       'Unknown Vendor'
     end
@@ -54,7 +53,8 @@ module ShopFilter
   end
 
   def product_img_url(url, style = 'small')
-    unless url =~ %r{\Aproducts/([\w\-\_]+)\.(\w{2,4})}
+
+    unless url =~ /\Aproducts\/([\w\-\_]+)\.(\w{2,4})/
       raise ArgumentError, 'filter "size" can only be called on product images'
     end
 
@@ -62,24 +62,27 @@ module ShopFilter
     when 'original'
       return '/files/shops/random_number/' + url
     when 'grande', 'large', 'medium', 'compact', 'small', 'thumb', 'icon'
-      "/files/shops/random_number/products/#{Regexp.last_match(1)}_#{style}.#{Regexp.last_match(2)}"
+      "/files/shops/random_number/products/#{$1}_#{style}.#{$2}"
     else
       raise ArgumentError, 'valid parameters for filter "size" are: original, grande, large, medium, compact, small, thumb and icon '
     end
   end
 
   def default_pagination(paginate)
+
     html = []
     html << %(<span class="prev">#{link_to(paginate['previous']['title'], paginate['previous']['url'])}</span>) if paginate['previous']
 
-    paginate['parts'].each do |part|
+    for part in paginate['parts']
-      html << if part['is_link']
+
-        %(<span class="page">#{link_to(part['title'], part['url'])}</span>)
+      if part['is_link']
+        html << %(<span class="page">#{link_to(part['title'], part['url'])}</span>)
       elsif part['title'].to_i == paginate['current_page'].to_i
-        %(<span class="page current">#{part['title']}</span>)
+        html << %(<span class="page current">#{part['title']}</span>)
       else
-        %(<span class="deco">#{part['title']}</span>)
+        html << %(<span class="deco">#{part['title']}</span>)
       end
+
     end
 
     html << %(<span class="next">#{link_to(paginate['next']['title'], paginate['next']['url'])}</span>) if paginate['next']
@@ -103,4 +106,5 @@ module ShopFilter
     result.gsub!(/\A-+/, '') if result[0] == '-'
     result
   end
+
 end

performance/shopify/tag_filter.rb

@@ -1,11 +1,10 @@
-# frozen_string_literal: true
-
 module TagFilter
+
   def link_to_tag(label, tag)
     "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tag}\">#{label}</a>"
   end
 
-  def highlight_active_tag(tag, css_class = 'active')
+  def highlight_active_tag(tag, css_class='active')
     if @context['current_tags'].include?(tag)
       "<span class=\"#{css_class}\">#{tag}</span>"
     else
@@ -15,11 +14,12 @@ module TagFilter
 
   def link_to_add_tag(label, tag)
     tags = (@context['current_tags'] + [tag]).uniq
-    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tags.join('+')}\">#{label}</a>"
+    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tags.join("+")}\">#{label}</a>"
   end
 
   def link_to_remove_tag(label, tag)
     tags = (@context['current_tags'] - [tag]).uniq
-    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tags.join('+')}\">#{label}</a>"
+    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tags.join("+")}\">#{label}</a>"
   end
+
 end

performance/shopify/weight_filter.rb

@@ -1,11 +1,11 @@
-# frozen_string_literal: true
-
 module WeightFilter
+
   def weight(grams)
-    format("%.2f", grams / 1000)
+    sprintf("%.2f", grams / 1000)
   end
 
   def weight_with_unit(grams)
     "#{weight(grams)} kg"
   end
+
 end

performance/theme_runner.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This profiler run simulates Shopify.
 # We are looking in the tests directory for liquid files and render them within the designated layout file.
 # We will also export a substantial database to liquid which the templates can render values of.
@@ -8,115 +6,81 @@
 # Shopify which is likely the biggest user of liquid in the world which something to the tune of several
 # million Template#render calls a day.
 
-require_relative 'shopify/liquid'
+require 'rubygems'
-require_relative 'shopify/database'
+require 'active_support'
+require 'active_support/json'
+require 'yaml'
+require 'digest/md5'
+require File.dirname(__FILE__) + '/shopify/liquid'
+require File.dirname(__FILE__) + '/shopify/database.rb'
 
 class ThemeRunner
   class FileSystem
+
     def initialize(path)
       @path = path
     end
 
     # Called by Liquid to retrieve a template file
-    def read_template_file(template_path)
+    def read_template_file(template_path, context)
       File.read(@path + '/' + template_path + '.liquid')
     end
   end
 
-  # Initialize a new liquid ThemeRunner instance
+  # Load all templates into memory, do this now so that
-  # Will load all templates into memory, do this now so that we don't profile IO.
+  # we don't profile IO.
   def initialize
-    @tests = Dir[__dir__ + '/tests/**/*.liquid'].collect do |test|
+    @tests = Dir[File.dirname(__FILE__) + '/tests/**/*.liquid'].collect do |test|
       next if File.basename(test) == 'theme.liquid'
 
       theme_path = File.dirname(test) + '/theme.liquid'
-      {
+
-        liquid: File.read(test),
+      [File.read(test), (File.file?(theme_path) ? File.read(theme_path) : nil), test]
-        layout: (File.file?(theme_path) ? File.read(theme_path) : nil),
-        template_name: test,
-      }
     end.compact
-
-    compile_all_tests
   end
 
-  # `compile` will test just the compilation portion of liquid without any templates
   def compile
-    @tests.each do |test_hash|
+    # Dup assigns because will make some changes to them
-      Liquid::Template.new.parse(test_hash[:liquid])
+
-      Liquid::Template.new.parse(test_hash[:layout])
+    @tests.each do |liquid, layout, template_name|
+
+      tmpl = Liquid::Template.new
+      tmpl.parse(liquid)
+      tmpl = Liquid::Template.new
+      tmpl.parse(layout)
     end
   end
 
-  # `run` is called to benchmark rendering and compiling at the same time
+   def run
-  def run
-    each_test do |liquid, layout, assigns, page_template, template_name|
-      compile_and_render(liquid, layout, assigns, page_template, template_name)
-    end
-  end
-
-  # `render` is called to benchmark just the render portion of liquid
-  def render
-    @compiled_tests.each do |test|
-      tmpl = test[:tmpl]
-      assigns = test[:assigns]
-      layout = test[:layout]
-
-      if layout
-        assigns['content_for_layout'] = tmpl.render!(assigns)
-        layout.render!(assigns)
-      else
-        tmpl.render!(assigns)
-      end
-    end
-  end
-
-  private
-
-  def compile_and_render(template, layout, assigns, page_template, template_file)
-    compiled_test = compile_test(template, layout, assigns, page_template, template_file)
-    assigns['content_for_layout'] = compiled_test[:tmpl].render!(assigns)
-    compiled_test[:layout].render!(assigns) if layout
-  end
-
-  def compile_all_tests
-    @compiled_tests = []
-    each_test do |liquid, layout, assigns, page_template, template_name|
-      @compiled_tests << compile_test(liquid, layout, assigns, page_template, template_name)
-    end
-    @compiled_tests
-  end
-
-  def compile_test(template, layout, assigns, page_template, template_file)
-    tmpl = init_template(page_template, template_file)
-    parsed_template = tmpl.parse(template).dup
-
-    if layout
-      parsed_layout = tmpl.parse(layout)
-      { tmpl: parsed_template, assigns: assigns, layout: parsed_layout }
-    else
-      { tmpl: parsed_template, assigns: assigns }
-    end
-  end
-
-  # utility method with similar functionality needed in `compile_all_tests` and `run`
-  def each_test
     # Dup assigns because will make some changes to them
     assigns = Database.tables.dup
 
-    @tests.each do |test_hash|
+    @tests.each do |liquid, layout, template_name|
-      # Compute page_template outside of profiler run, uninteresting to profiler
+
-      page_template = File.basename(test_hash[:template_name], File.extname(test_hash[:template_name]))
+      # Compute page_tempalte outside of profiler run, uninteresting to profiler
-      yield(test_hash[:liquid], test_hash[:layout], assigns, page_template, test_hash[:template_name])
+      page_template = File.basename(template_name, File.extname(template_name))
+      compile_and_render(liquid, layout, assigns, page_template, template_name)
+
     end
   end
 
-  # set up a new Liquid::Template object for use in `compile_and_render` and `compile_test`
+
-  def init_template(page_template, template_file)
+  def compile_and_render(template, layout, assigns, page_template, template_file)
     tmpl = Liquid::Template.new
     tmpl.assigns['page_title'] = 'Page title'
     tmpl.assigns['template'] = page_template
     tmpl.registers[:file_system] = ThemeRunner::FileSystem.new(File.dirname(template_file))
-    tmpl
+
+    content_for_layout = tmpl.parse(template).render!(assigns)
+
+    if layout
+      assigns['content_for_layout'] = content_for_layout
+      tmpl.parse(layout).render!(assigns)
+    else
+      content_for_layout
+    end
   end
 end
+
+
+

test/integration/assign_test.rb

@@ -1,50 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class AssignTest < Minitest::Test
-  include Liquid
-
-  def test_assign_with_hyphen_in_variable_name
-    template_source = <<-END_TEMPLATE
-    {% assign this-thing = 'Print this-thing' %}
-    {{ this-thing }}
-    END_TEMPLATE
-    template = Template.parse(template_source)
-    rendered = template.render!
-    assert_equal("Print this-thing", rendered.strip)
-  end
-
-  def test_assigned_variable
-    assert_template_result('.foo.',
-      '{% assign foo = values %}.{{ foo[0] }}.',
-      'values' => %w(foo bar baz))
-
-    assert_template_result('.bar.',
-      '{% assign foo = values %}.{{ foo[1] }}.',
-      'values' => %w(foo bar baz))
-  end
-
-  def test_assign_with_filter
-    assert_template_result('.bar.',
-      '{% assign foo = values | split: "," %}.{{ foo[1] }}.',
-      'values' => "foo,bar,baz")
-  end
-
-  def test_assign_syntax_error
-    assert_match_syntax_error(/assign/,
-      '{% assign foo not values %}.',
-      'values' => "foo,bar,baz")
-  end
-
-  def test_assign_uses_error_mode
-    with_error_mode(:strict) do
-      assert_raises(SyntaxError) do
-        Template.parse("{% assign foo = ('X' | downcase) %}")
-      end
-    end
-    with_error_mode(:lax) do
-      assert Template.parse("{% assign foo = ('X' | downcase) %}")
-    end
-  end
-end # AssignTest

test/integration/block_test.rb

@@ -1,14 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class BlockTest < Minitest::Test
-  include Liquid
-
-  def test_unexpected_end_tag
-    exc = assert_raises(SyntaxError) do
-      Template.parse("{% if true %}{% endunless %}")
-    end
-    assert_equal(exc.message, "Liquid syntax error: 'endunless' is not a valid delimiter for if tags. use endif")
-  end
-end

test/integration/context_test.rb

@@ -1,34 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class ContextTest < Minitest::Test
-  include Liquid
-
-  def test_override_global_filter
-    global = Module.new do
-      def notice(output)
-        "Global #{output}"
-      end
-    end
-
-    local = Module.new do
-      def notice(output)
-        "Local #{output}"
-      end
-    end
-
-    with_global_filter(global) do
-      assert_equal 'Global test', Template.parse("{{'test' | notice }}").render!
-      assert_equal 'Local test', Template.parse("{{'test' | notice }}").render!({}, filters: [local])
-    end
-  end
-
-  def test_has_key_will_not_add_an_error_for_missing_keys
-    with_error_mode :strict do
-      context = Context.new
-      context.key?('unknown')
-      assert_empty context.errors
-    end
-  end
-end

test/integration/document_test.rb

@@ -1,21 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class DocumentTest < Minitest::Test
-  include Liquid
-
-  def test_unexpected_outer_tag
-    exc = assert_raises(SyntaxError) do
-      Template.parse("{% else %}")
-    end
-    assert_equal(exc.message, "Liquid syntax error: Unexpected outer 'else' tag")
-  end
-
-  def test_unknown_tag
-    exc = assert_raises(SyntaxError) do
-      Template.parse("{% foo %}")
-    end
-    assert_equal(exc.message, "Liquid syntax error: Unknown tag 'foo'")
-  end
-end