Add extension to gemspec

Ragel doesn't allow us to recurse so we simply
reinvoke the parser for each step.

.github/probots.yml

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

.github/workflows/liquid.yml

@@ -1,39 +0,0 @@
-name: Liquid
-on: [push, pull_request]
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        entry:
-          - { ruby: 2.5, allowed-failure: false } # minimum supported
-          - { ruby: 3.0, allowed-failure: false } # latest
-          - { ruby: ruby-head, allowed-failure: true }
-    name: test (${{ matrix.entry.ruby }})
-    steps:
-      - uses: actions/checkout@v2
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: ${{ matrix.entry.ruby }}
-      - uses: actions/cache@v1
-        with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-gems-${{ hashFiles('Gemfile') }}
-          restore-keys: ${{ runner.os }}-gems-
-      - run: bundle install --jobs=3 --retry=3 --path=vendor/bundle
-      - run: bundle exec rake
-        continue-on-error: ${{ matrix.entry.allowed-failure }}
-  memory_profile:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 2.7
-      - uses: actions/cache@v1
-        with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-gems-${{ hashFiles('Gemfile') }}
-          restore-keys: ${{ runner.os }}-gems-
-      - run: bundle install --jobs=3 --retry=3 --path=vendor/bundle
-      - run: bundle exec rake memory_profile:run

.gitignore

@@ -4,7 +4,8 @@
 pkg
 *.rbc
 .rvmrc
-.ruby-version
+*.o
-Gemfile.lock
+*.bundle
-.bundle
+ext/liquid/Makefile
-.byebug_history
+ext/liquid/liquid_context.c
+

.rubocop.yml

@@ -1,18 +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
-  NewCops: disable
-  Exclude:
-    - 'vendor/bundle/**/*'
-
-Naming/MethodName:
-  Exclude:
-    - 'example/server/liquid_servlet.rb'

.rubocop_todo.yml

@@ -1,57 +0,0 @@
-# This configuration was generated by
-# `rubocop --auto-gen-config`
-# on 2020-12-11 18:53:41 UTC using RuboCop version 1.6.1.
-# 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: 113
-# Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
-# URISchemes: http, https
-Layout/LineLength:
-  Max: 260
-
-# Offense count: 8
-Lint/MissingSuper:
-  Exclude:
-    - 'lib/liquid/forloop_drop.rb'
-    - 'lib/liquid/tablerowloop_drop.rb'
-    - 'test/integration/assign_test.rb'
-    - 'test/integration/context_test.rb'
-    - 'test/integration/filter_test.rb'
-    - 'test/integration/standard_filter_test.rb'
-    - 'test/integration/tags/for_tag_test.rb'
-    - 'test/integration/tags/table_row_test.rb'
-
-# Offense count: 43
-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/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: 2
-Style/ClassVars:
-  Exclude:
-    - 'lib/liquid/condition.rb'

.travis.yml

@@ -0,0 +1,13 @@
+rvm:
+  - 1.8.7
+  - 1.9.3
+  - ree
+  - jruby-18mode
+  - jruby-19mode
+  - rbx-18mode
+  - rbx-19mode
+
+script: "rake test"
+
+notifications:
+  disable: true

CONTRIBUTING.md

@@ -1,25 +0,0 @@
-# How to contribute
-
-## Things we will merge
-
-* Bugfixes
-* Performance improvements
-* Features that are likely to be useful to the majority of Liquid users
-
-## Things we won't merge
-
-* Code that introduces considerable performance degrations
-* Code that 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 that can easily be implemented on top of Liquid (for example as a custom filter or custom filesystem)
-* Code that does not include tests
-* Code that 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
-* Make sure all tests pass (`bundle exec rake`)
-* Create a pull request
-

Gemfile

@@ -1,27 +0,0 @@
-# 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', '~> 1.4', require: false
-  gem 'rubocop-performance', require: false
-
-  platform :mri, :truffleruby do
-    gem 'liquid-c', github: 'Shopify/liquid-c', ref: 'inline-comment'
-  end
-end

History.md

@@ -1,254 +1,4 @@
-# Liquid Change Log
+# Liquid Version History
-
-## Unreleased
-
-### Features
-* Allow `#` to be used as an inline comment tag (#1401) [Dylan Thacker-Smith]
-
-## 5.0.0 / 2021-01-06
-
-### Features
-* Add new `{% render %}` tag (#1122) [Samuel Doiron]
-* Add support for `as` in `{% render %}` and `{% include %}` (#1181) [Mike Angell]
-* Add `{% liquid %}` and `{% echo %}` tags (#1086) [Justin Li]
-* Add [usage tracking](README.md#usage-tracking) [Mike Angell]
-* Add `Tag.disable_tags` for disabling tags that prepend `Tag::Disableable` at render time (#1162, #1274, #1275) [Mike Angell]
-* Support using a profiler for multiple renders (#1365, #1366) [Dylan Thacker-Smith]
-
-### Fixes
-* Fix catastrophic backtracking in `RANGES_REGEX` regular expression (#1357) [Dylan Thacker-Smith]
-* Make sure the for tag's limit and offset are integers (#1094) [David Cornu]
-* Invokable methods for enumerable reject include (#1151) [Thierry Joyal]
-* Allow `default` filter to handle `false` as value (#1144) [Mike Angell]
-* Fix render length resource limit so it doesn't multiply nested output (#1285) [Dylan Thacker-Smith]
-* Fix duplication of text in raw tags (#1304) [Peter Zhu]
-* Fix strict parsing of find variable with a name expression (#1317) [Dylan Thacker-Smith]
-* Use monotonic time to measure durations in Liquid::Profiler (#1362) [Dylan Thacker-Smith]
-
-### Breaking Changes
-* Require Ruby >= 2.5 (#1131, #1310) [Mike Angell, Dylan Thacker-Smith]
-* Remove support for taint checking (#1268) [Dylan Thacker-Smith]
-* Split Strainer class into StrainerFactory and StrainerTemplate (#1208) [Thierry Joyal]
-* Remove handling of a nil context in the Strainer class (#1218) [Thierry Joyal]
-* Handle `BlockBody#blank?` at parse time (#1287) [Dylan Thacker-Smith]
-* Pass the tag markup and tokenizer to `Document#unknown_tag` (#1290) [Dylan Thacker-Smith]
-* And several internal changes
-
-### Performance Improvements
-* Reduce allocations (#1073, #1091, #1115, #1099, #1117, #1141, #1322, #1341) [Richard Monette, Florian Weingarten, Ashwin Maroli]
-* Improve resources limits performance (#1093, #1323) [Florian Weingarten, Dylan Thacker-Smith]
-
-## 4.0.3 / 2019-03-12
-
-### Fixed
-* Fix break and continue tags inside included templates in loops (#1072) [Justin Li]
-
-## 4.0.2 / 2019-03-08
-
-### 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 #114: strip_html filter supports style tags [James Allardice]
-* Bugfix for #117: 'now' support for date filter in Ruby 1.9 [Notre Dame Webgroup]
-* Bugfix for #166: truncate filter on UTF-8 strings with Ruby 1.8 [Florian Weingarten]
-* Bugfix for #204: 'raw' parsing bug [Florian Weingarten]
-* Bugfix for #150: 'for' parsing bug [Peter Schröder]
-* Bugfix for #126: Strip CRLF in strip_newline [Peter Schröder]
-* Bugfix for #174, "can't convert Fixnum into String" for "replace" [jsw0528]
-* Allow a Liquid::Drop to be passed into Template#render [Daniel Huckstep]
-* Resource limits [Florian Weingarten]
-* Add reverse filter [Jay Strybis]
-* Add utf-8 support
-* Use array instead of Hash to keep the registered filters [Tasos Stathopoulos]
-* Cache tokenized partial templates [Tom Burns]
-* Avoid warnings in Ruby 1.9.3 [Marcus Stollsteimer]
-* Better documentation for 'include' tag (closes #163) [Peter Schröder]
-* Use of BigDecimal on filters to have better precision (closes #155) [Arthur Nogueira Neves]
-
-## 2.5.5 / 2014-01-10 / branch "2-5-stable"
-
-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]
-
-## 2.5.4 / 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]
-
-## 2.5.2 / 2013-09-03 / deleted
-
-Yanked from rubygems, as it contained too many changes that broke compatibility. Those changes will be on following major releases.
-
-## 2.5.1 / 2013-07-24
-
-* #230: Fix security issue with map filter, Use invoke_drop in map filter [Florian Weingarten]
 
 ## 2.5.0 / 2013-03-06
 
@@ -258,7 +8,6 @@ Yanked from rubygems, as it contained too many changes that broke compatibility.
 * Fix filter parser for args without space separators
 * Add support for filter keyword arguments
 
-
 ## 2.4.0 / 2012-08-03
 
 * Performance improvements

README.md

@@ -1,14 +1,5 @@
-[![Build Status](https://api.travis-ci.org/Shopify/liquid.svg?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)
-* [Version history](History.md)
-* [Liquid documentation from Shopify](http://docs.shopify.com/themes/liquid-basics)
-* [Liquid Wiki at GitHub](https://github.com/Shopify/liquid/wiki)
-* [Website](http://liquidmarkup.org/)
-
 ## Introduction
 
 Liquid is a template engine which was written with very specific requirements:
@@ -42,8 +33,6 @@ 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.
 
@@ -52,63 +41,4 @@ For standard use you can just pass it the content of a file and call render with
 @template.render('name' => 'tobi')                # => "hi tobi"
 ```
 
-### Error Modes
+[![Build Status](https://secure.travis-ci.org/Shopify/liquid.png)](http://travis-ci.org/Shopify/liquid)
-
-Setting the error mode of Liquid lets you specify how strictly you want your templates to be interpreted.
-Normally the parser is very lax and will accept almost anything without error. Unfortunately this can make
-it very hard to debug and can lead to unexpected behaviour. 
-
-Liquid also comes with a stricter parser that can be used when editing templates to give better error messages
-when templates are invalid. You can enable this new parser like this:
-
-```ruby
-Liquid::Template.error_mode = :strict # Raises a SyntaxError when invalid syntax is used
-Liquid::Template.error_mode = :warn # Adds errors to template.errors but continues as normal
-Liquid::Template.error_mode = :lax # The default mode, accepts almost anything.
-```
-
-If you want to set the error mode only on specific templates you can pass `:error_mode` as an option to `parse`:
-```ruby
-Liquid::Template.parse(source, :error_mode => :strict)
-```
-This is useful for doing things like enabling strict mode only in the theme editor.
-
-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

@@ -1,112 +1,91 @@
-# frozen_string_literal: true
+#!/usr/bin/env ruby
 
+require 'rubygems'
 require 'rake'
+require 'rake/clean'
+require 'fileutils'
 require 'rake/testtask'
-$LOAD_PATH.unshift(File.expand_path("../lib", __FILE__))
+require 'rubygems/package_task'
-require "liquid/version"
 
-task(default: [:test, :rubocop])
+task :default => [:compile, :test]
 
-desc('run test suite with default parser')
+task :gen do
-Rake::TestTask.new(:base_test) do |t|
+  sh "leg -oext/liquid/liquid_context.c ext/liquid/liquid_context.leg"
-  t.libs << 'lib' << 'test'
-  t.test_files = FileList['test/{integration,unit}/**/*_test.rb']
-  t.verbose    = false
 end
 
-Rake::TestTask.new(:integration_test) do |t|
+task :compile => [:gen, :liquid_ext]
-  t.libs << 'lib' << 'test'
+
-  t.test_files = FileList['test/integration/**/*_test.rb']
+extension = "liquid_ext"
-  t.verbose    = false
+ext = "ext/liquid"
+ext_so = "#{ext}/#{extension}.#{RbConfig::CONFIG['DLEXT']}"
+ext_files = FileList[
+  "#{ext}/*.c",
+  "#{ext}/*.h",
+  "#{ext}/*.leg",
+  "#{ext}/extconf.rb",
+  "#{ext}/Makefile",
+  "lib"
+]
+
+task "lib" do
+  directory "lib"
 end
 
-desc('run test suite with warn error mode')
+desc "Builds just the #{extension} extension"
-task :warn_test do
+task extension.to_sym => [:gen, "#{ext}/Makefile", ext_so ]
-  ENV['LIQUID_PARSER_MODE'] = 'warn'
+
-  Rake::Task['base_test'].invoke
+file "#{ext}/Makefile" => ["#{ext}/extconf.rb"] do
+  Dir.chdir(ext) do ruby "extconf.rb" end
 end
 
-task :rubocop do
+file ext_so => ext_files do
-  if RUBY_ENGINE == 'ruby'
+  Dir.chdir(ext) do
-    require 'rubocop/rake_task'
+    sh "make"
-    RuboCop::RakeTask.new
   end
+  cp ext_so, "lib"
 end
 
-desc('runs test suite with both strict and lax parsers')
+Rake::TestTask.new(:test => [:gen, 'liquid_ext']) do |t|
-task :test do
+  t.libs << '.' << 'lib' << 'test'
-  ENV['LIQUID_PARSER_MODE'] = 'lax'
+  t.test_files = FileList['test/liquid/**/*_test.rb']
-  Rake::Task['base_test'].invoke
+  t.verbose = false
-
-  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['integration_test'].reenable
-    Rake::Task['integration_test'].invoke
-
-    ENV['LIQUID_PARSER_MODE'] = 'strict'
-    Rake::Task['integration_test'].reenable
-    Rake::Task['integration_test'].invoke
-  end
 end
 
-task(gem: :build)
+gemspec = eval(File.read('liquid.gemspec'))
-task :build do
+Gem::PackageTask.new(gemspec) do |pkg|
-  system "gem build liquid.gemspec"
+  pkg.gem_spec = gemspec
 end
 
-task install: :build do
+desc "Build the gem and release it to rubygems.org"
-  system "gem install liquid-#{Liquid::VERSION}.gem"
+task :release => :gem do
-end
+  sh "gem push pkg/liquid-#{gemspec.version}.gem"
-
-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"
-  system "rm liquid-#{Liquid::VERSION}.gem"
 end
 
 namespace :benchmark do
-  desc "Run the liquid benchmark with lax parsing"
+
+  desc "Run the liquid benchmark"
   task :run do
-    ruby "./performance/benchmark.rb lax"
+    ruby "./performance/benchmark.rb"
   end
 
-  desc "Run the liquid benchmark with strict parsing"
-  task :strict do
-    ruby "./performance/benchmark.rb strict"
-  end
 end
 
+
 namespace :profile do
+
   desc "Run the liquid profile/performance coverage"
   task :run do
     ruby "./performance/profile.rb"
   end
 
-  desc "Run the liquid profile/performance coverage with strict parsing"
+  desc "Run KCacheGrind"
-  task :strict do
+  task :grind => :run  do
-    ruby "./performance/profile.rb strict"
+    system "qcachegrind /tmp//callgrind.liquid.txt"
   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
-  exec 'irb -I lib -r liquid'
-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, '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 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' }]
-  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
+
+  private
+  
+  def products_list
+    [{'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 Diamond', 'price' => 59900, 'description' => 'the *arbor diamond* is a made up product because im obsessed with arbor and have no creativity'}]
+  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/
+    @request.path_info =~ /(\w+)$/
-    @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

@@ -1,27 +1,27 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
-  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
-  <head>
+	<head>
-    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
+		<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
-    <meta http-equiv="Content-Language" content="en-us" />
+		<meta http-equiv="Content-Language" content="en-us" />
 		
-    <title>products</title>
+		<title>products</title>
 		
-    <meta name="ROBOTS" content="ALL" />
+		<meta name="ROBOTS" content="ALL" />
-    <meta http-equiv="imagetoolbar" content="no" />
+		<meta http-equiv="imagetoolbar" content="no" />
-    <meta name="MSSmartTagsPreventParsing" content="true" />
+		<meta name="MSSmartTagsPreventParsing" content="true" />
-    <meta name="Copyright" content="(c) 2005 Copyright content:  Copyright design: Tobias Luetke" />
+		<meta name="Copyright" content="(c) 2005 Copyright content:  Copyright design: Tobias Luetke" />
-    <!-- (c) Copyright 2005 by Tobias Luetke All Rights Reserved. -->
+		<!-- (c) Copyright 2005 by Tobias Luetke All Rights Reserved. -->
-  </head>
+	</head>
 	
-  <body>
+	<body>
-    {% assign all_products = products | concat: more_products  %}
-    <h1>{{ description | split: '~' | first }}</h1>
 
-    <h2>{{ description | split: '~' | last }}</h2>
+	  <h1>{{ description | split: '~' | first }}</h1>
 
-    <h2>There are currently {{all_products | count}} products in the {{section}} catalog</h2>
+	  <h2>{{ description | split: '~' | last }}</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 }}
@@ -45,5 +45,5 @@
       
     </ul>
 	
-  </body>
+	</body>
 </html>

ext/liquid/extconf.rb

@@ -0,0 +1,6 @@
+require 'mkmf'
+
+dir_config("liquid_ext")
+have_library("c", "main")
+
+create_makefile("liquid_ext")

ext/liquid/liquid_context.leg

@@ -0,0 +1,98 @@
+
+%{ 
+//uncomment to get more debug instrumentation
+//
+//#define YY_DEBUG 
+
+#include <ruby.h>
+
+#define EMIT(sym, data) \
+  rb_ary_push(ctx->rb_tokens, rb_ary_new3(2, ID2SYM(rb_intern(sym)), data)); 
+
+#define yy_rb_str rb_str_new(yytext, yyleng)
+
+#define YYSTYPE VALUE
+#define YY_CTX_LOCAL
+#define YY_CTX_MEMBERS VALUE rb_tokens; char *p; int p_len;
+
+#define YY_INPUT(buf, result, max_size) { \
+    result = ctx->p_len;  \
+    if (result>0 || EOF == ctx->p[0]) { \
+      if (max_size < result) { result = max_size; } \
+      strncpy(buf, ctx->p, result); \
+      buf[result] = '\0'; \
+      yyprintf((stderr, "\nREFILLING %d chars now:<%s>", result, buf));      \
+      ctx->p += result; ctx->p_len -= result; \
+      yyprintf((stderr, "\nREFILLING DONE size left: %d <%s>", ctx->p_len, ctx->p));      \
+    } \
+  }
+%}
+
+grammar  = primary
+         | entity
+         | range
+         | hash { EMIT("lookup", Qnil); }
+         ; 
+
+hash     = '[' (primary|entity) ']';
+
+primary  = var:const     { EMIT("id", var); }
+         | var:string    { EMIT("id", var); } 
+         | var:numeric   { EMIT("id", var); } 
+         ;
+
+accessors = hash         { EMIT("call", Qnil); }
+          | '.first'     { EMIT("buildin", rb_str_new2("first")); }
+          | '.last'      { EMIT("buildin", rb_str_new2("last")); }
+          | '.size'      { EMIT("buildin", rb_str_new2("size")); }          
+          | '.' <identifier>   { EMIT("id", yy_rb_str); EMIT("call", Qnil); } 
+          ;
+
+entity  = <identifier>   { EMIT("id", yy_rb_str); EMIT("lookup", Qnil); } 
+          accessors* 
+        ;
+
+rangelet = var:integer   { EMIT("id", var); }
+         | entity 
+         ;
+
+range    = '(' rangelet '..' rangelet ')' { EMIT("range", Qnil); } 
+
+
+string = ['] < ( !['] .  )* > [']  { $$ = yy_rb_str; }
+       | ["] < ( !["] .  )* > ["]  { $$ = yy_rb_str; }
+       ;
+
+numeric = float
+        | integer
+        ;
+
+float = <'-'? digit+'.'digit+>     { $$ = rb_funcall(rb_cObject, rb_intern("Float"), 1, yy_rb_str); }
+integer = <'-'? digit+>           { $$ = rb_funcall(rb_cObject, rb_intern("Integer"), 1, yy_rb_str); }
+
+
+const   = "true"    { $$ = Qtrue; }
+        | 'false'   { $$ = Qfalse; }
+        | 'nil'     { $$ = Qnil; }
+        | 'null'    { $$ = Qnil; }
+        ;
+
+digit = [0-9];
+identifier = [a-zA-Z][a-zA-Z0-9_\-]*[?!]?;
+
+%% 
+
+VALUE liquid_context_parse_impl(VALUE self, VALUE text) {
+  char *p; 
+  int len; 
+  yycontext ctx;  
+
+  memset(&ctx, 0, sizeof(yycontext));
+  ctx.p = RSTRING_PTR(text);  
+  ctx.p_len = (int) RSTRING_LEN(text);
+  ctx.rb_tokens = rb_ary_new();
+ 
+  yyparse(&ctx);
+
+  return ctx.rb_tokens;
+}

ext/liquid/liquid_ext.c

@@ -0,0 +1,13 @@
+#include <ruby.h>
+
+static VALUE rb_Liquid;
+static VALUE rb_Parser;
+
+VALUE liquid_context_parse_impl(VALUE text);
+
+void Init_liquid_ext()
+{
+  rb_Liquid = rb_define_module("Liquid");
+  rb_Parser = rb_define_class_under(rb_Liquid, "Parser", rb_cObject);
+  rb_define_singleton_method(rb_Parser, "parse", liquid_context_parse_impl, 1);  
+}

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
@@ -26,7 +24,6 @@ module Liquid
   ArgumentSeparator           = ','
   FilterArgumentSeparator     = ':'
   VariableAttributeSeparator  = '.'
-  WhitespaceControl           = '-'
   TagStart                    = /\{\%/
   TagEnd                      = /\%\}/
   VariableSignature           = /\(?[\w\-\.\[\]]\)?/
@@ -36,57 +33,37 @@ module Liquid
   VariableIncompleteEnd       = /\}\}?/
   QuotedString                = /"[^"]*"|'[^']*'/
   QuotedFragment              = /#{QuotedString}|(?:[^\s,\|'"]|#{QuotedString})+/o
+  StrictQuotedFragment        = /"[^"]+"|'[^']+'|[^\s|:,]+/
+  FirstFilterArgument         = /#{FilterArgumentSeparator}(?:#{StrictQuotedFragment})/o
+  OtherFilterArgument         = /#{ArgumentSeparator}(?:#{StrictQuotedFragment})/o
+  SpacelessFilter             = /^(?:'[^']+'|"[^"]+"|[^'"])*#{FilterSeparator}(?:#{StrictQuotedFragment})(?:#{FirstFilterArgument}(?:#{OtherFilterArgument})*)?/o
+  Expression                  = /(?:#{QuotedFragment}(?:#{SpacelessFilter})*)/o
   TagAttributes               = /(\w+)\s*\:\s*(#{QuotedFragment})/o
-  AnyStartingTag              = /#{TagStart}|#{VariableStart}/o
+  AnyStartingTag              = /\{\{|\{\%/
-  PartialTemplateParser       = /#{TagStart}.*?#{TagEnd}|#{VariableStart}.*?#{VariableIncompleteEnd}/om
+  PartialTemplateParser       = /#{TagStart}.*?#{TagEnd}|#{VariableStart}.*?#{VariableIncompleteEnd}/o
-  TemplateParser              = /(#{PartialTemplateParser}|#{AnyStartingTag})/om
+  TemplateParser              = /(#{PartialTemplateParser}|#{AnyStartingTag})/o
   VariableParser              = /\[[^\]]+\]|#{VariableSegment}+\??/o
-
-  RAISE_EXCEPTION_LAMBDA = ->(_e) { raise }
-
-  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_factory'
+require 'liquid/strainer'
-require 'liquid/strainer_template'
-require 'liquid/expression'
 require 'liquid/context'
-require 'liquid/parser_switching'
 require 'liquid/tag'
-require 'liquid/tag/disabler'
-require 'liquid/tag/disableable'
 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/htmltags'
 require 'liquid/standardfilters'
 require 'liquid/condition'
+require 'liquid/module_ex'
 require 'liquid/utils'
-require 'liquid/tokenizer'
+require 'liquid_ext'
-require 'liquid/parse_context'
-require 'liquid/partial_cache'
-require 'liquid/usage'
-require 'liquid/register'
-require 'liquid/static_registers'
-require 'liquid/template_factory'
 
 # 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 }

lib/liquid/block.rb

@@ -1,94 +1,115 @@
-# frozen_string_literal: true
-
 module Liquid
-  class Block < Tag
-    MAX_DEPTH = 100
 
-    def initialize(tag_name, markup, options)
+  class Block < Tag
-      super
+    IsTag             = /^#{TagStart}/o
-      @blank = true
+    IsVariable        = /^#{VariableStart}/o
-    end
+    FullToken         = /^#{TagStart}\s*(\w+)\s*(.*)?#{TagEnd}$/o
+    ContentOfVariable = /^#{VariableStart}(.*)#{VariableEnd}$/o
 
     def parse(tokens)
-      @body = new_body
+      @nodelist ||= []
-      while parse_body(@body, tokens)
+      @nodelist.clear
+
+      while token = tokens.shift
+
+        case token
+        when IsTag
+          if token =~ FullToken
+
+            # if we found the proper block delimitor 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]
+              @nodelist << tag.new($1, $2, tokens)
+            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, "Tag '#{token}' was not properly terminated with regexp: #{TagEnd.inspect} "
+          end
+        when IsVariable
+          @nodelist << create_variable(token)
+        when ''
+          # pass
+        else
+          @nodelist << token
+        end
       end
-      @body.freeze
+
+      # Make sure that its ok to end parsing in the current block.
+      # Effectively this method will throw and exception unless the current block is
+      # of type Document
+      assert_missing_delimitation!
     end
 
-    # For backwards compatibility
+    def end_tag
-    def render(context)
-      @body.render(context)
     end
 
-    def blank?
+    def unknown_tag(tag, params, tokens)
-      @blank
+      case tag
-    end
+      when 'else'
-
+        raise SyntaxError, "#{block_name} tag does not expect else tag"
-    def nodelist
+      when 'end'
-      @body.nodelist
+        raise SyntaxError, "'end' is not a valid delimiter for #{block_name} tags. use #{block_delimiter}"
-    end
-
-    def unknown_tag(tag_name, _markup, _tokenizer)
-      Block.raise_unknown_tag(tag_name, block_name, block_delimiter, parse_context)
-    end
-
-    # @api private
-    def self.raise_unknown_tag(tag, block_name, block_delimiter, parse_context)
-      if tag == 'else'
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_else",
-          block_name: block_name)
-      elsif tag.start_with?('end')
-        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, "Unknown tag '#{tag}'"
       end
     end
 
-    def raise_tag_never_closed(block_name)
+    def block_delimiter
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
+      "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|
-    end
+        return Variable.new(content.first)
-
-    private
-
-    # @api public
-    def new_body
-      parse_context.new_block_body
-    end
-
-    # @api public
-    def parse_body(body, tokens)
-      if parse_context.depth >= MAX_DEPTH
-        raise StackLevelError, "Nesting too deep"
       end
-      parse_context.depth += 1
+      raise SyntaxError.new("Variable '#{token}' was not properly terminated with regexp: #{VariableEnd.inspect} ")
-      begin
+    end
-        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(context)
-          raise_tag_never_closed(block_name) unless end_tag_name
+      render_all(@nodelist, context)
+    end
 
-          # this tag is not registered with the system
+    protected
-          # pass it to the current block for special handling or error reporting
+
-          unknown_tag(end_tag_name, end_tag_params, tokens)
+    def assert_missing_delimitation!
+      raise SyntaxError.new("#{block_name} tag was never closed")
+    end
+
+    def render_all(list, context)
+      output = []
+      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
+
+          output << (token.respond_to?(:render) ? token.render(context) : token)
+        rescue ::StandardError => e
+          output << (context.handle_error(e))
         end
-      ensure
-        parse_context.depth -= 1
       end
 
-      true
+      output
     end
   end
 end

lib/liquid/block_body.rb

@@ -1,255 +0,0 @@
-# frozen_string_literal: true
-
-require 'English'
-
-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)
-      raise FrozenError, "can't modify frozen Liquid::BlockBody" if frozen?
-
-      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
-
-    def freeze
-      @nodelist.freeze
-      super
-    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
-
-    # @api private
-    def self.unknown_tag_in_liquid_tag(tag, parse_context)
-      Block.raise_unknown_tag(tag, 'liquid', '%}', parse_context)
-    end
-
-    # @api private
-    def self.raise_missing_tag_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination", token: token, tag_end: TagEnd.inspect)
-    end
-
-    # @api private
-    def self.raise_missing_variable_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination", token: token, tag_end: VariableEnd.inspect)
-    end
-
-    # @api private
-    def self.render_node(context, output, node)
-      node.render_to_output_buffer(context, output)
-    rescue => exc
-      blank_tag = !node.instance_of?(Variable) && node.blank?
-      rescue_render_node(context, output, node.line_number, exc, blank_tag)
-    end
-
-    # @api private
-    def self.rescue_render_node(context, output, line_number, exc, blank_tag)
-      case exc
-      when MemoryError
-        raise
-      when UndefinedVariable, UndefinedDropMethod, UndefinedFilter
-        context.handle_error(exc, line_number)
-      else
-        error_message = context.handle_error(exc, line_number)
-        unless blank_tag # conditional for backwards compatibility
-          output << error_message
-        end
-      end
-    end
-
-    private def parse_liquid_tag(markup, parse_context)
-      liquid_tag_tokenizer = parse_context.new_tokenizer(
-        markup, start_line_number: parse_context.line_number, for_liquid_tag: true
-      )
-      parse_for_liquid_tag(liquid_tag_tokenizer, parse_context) do |end_tag_name, _end_tag_markup|
-        if end_tag_name
-          BlockBody.unknown_tag_in_liquid_tag(end_tag_name, parse_context)
-        end
-      end
-    end
-
-    private def parse_for_document(tokenizer, parse_context)
-      while (token = tokenizer.shift)
-        next if token.empty?
-        case
-        when token.start_with?(TAGSTART)
-          whitespace_handler(token, parse_context)
-          unless token =~ FullToken
-            BlockBody.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'
-            parse_liquid_tag(markup, parse_context)
-            next
-          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)
-          first_byte = previous_token.getbyte(0)
-          previous_token.rstrip!
-          if previous_token.empty? && parse_context[:bug_compatible_whitespace_trimming] && first_byte
-            previous_token << first_byte
-          end
-        end
-      end
-      parse_context.trim_whitespace = (token[-3] == WhitespaceControl)
-    end
-
-    def blank?
-      @blank
-    end
-
-    # Remove blank strings in the block body for a control flow tag (e.g. `if`, `for`, `case`, `unless`)
-    # with a blank body.
-    #
-    # For example, in a conditional assignment like the following
-    #
-    # ```
-    # {% if size > max_size %}
-    #   {% assign size = max_size %}
-    # {% endif %}
-    # ```
-    #
-    # we assume the intention wasn't to output the blank spaces in the `if` tag's block body, so this method
-    # will remove them to reduce the render output size.
-    #
-    # Note that it is now preferred to use the `liquid` tag for this use case.
-    def remove_blank_strings
-      raise "remove_blank_strings only support being called on a blank block body" unless @blank
-      @nodelist.reject! { |node| node.instance_of?(String) }
-    end
-
-    def render(context)
-      render_to_output_buffer(context, +'')
-    end
-
-    def render_to_output_buffer(context, output)
-      freeze unless frozen?
-
-      context.resource_limits.increment_render_score(@nodelist.length)
-
-      idx = 0
-      while (node = @nodelist[idx])
-        if node.instance_of?(String)
-          output << node
-        else
-          render_node(context, output, node)
-          # 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 %}. These tags may also occur through Block or Include tags.
-          break if context.interrupt? # might have happened in a for-block
-        end
-        idx += 1
-
-        context.resource_limits.increment_write_score(output)
-      end
-
-      output
-    end
-
-    private
-
-    def render_node(context, output, node)
-      BlockBody.render_node(context, output, node)
-    end
-
-    def create_variable(token, parse_context)
-      token.scan(ContentOfVariable) do |content|
-        markup = content.first
-        return Variable.new(markup, parse_context)
-      end
-      BlockBody.raise_missing_variable_terminator(token, parse_context)
-    end
-
-    # @deprecated Use {.raise_missing_tag_terminator} instead
-    def raise_missing_tag_terminator(token, parse_context)
-      BlockBody.raise_missing_tag_terminator(token, parse_context)
-    end
-
-    # @deprecated Use {.raise_missing_variable_terminator} instead
-    def raise_missing_variable_terminator(token, parse_context)
-      BlockBody.raise_missing_variable_terminator(token, parse_context)
-    end
-
-    def registered_tags
-      Template.tags
-    end
-  end
-end

lib/liquid/condition.rb

@@ -1,93 +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) },
+      '==' => lambda { |cond, left, right|  cond.send(:equal_variables, left, right) },
-      '!=' => ->(cond, left, right) { !cond.send(:equal_variables, left, right) },
+      '!=' => lambda { |cond, left, right| !cond.send(:equal_variables, left, right) },
-      '<>' => ->(cond, left, right) { !cond.send(:equal_variables, left, right) },
+      '<>' => lambda { |cond, left, right| !cond.send(:equal_variables, left, right) },
-      '<' => :<,
+      '<'  => :<,
-      '>' => :>,
+      '>'  => :>,
       '>=' => :>=,
       '<=' => :<=,
-      'contains' => lambda do |_cond, left, right|
+      'contains' => 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,
-    }
-
-    class MethodLiteral
-      attr_reader :method_name, :to_s
-
-      def initialize(method_name, to_s)
-        @method_name = method_name
-        @to_s = to_s
-      end
-    end
-
-    @@method_literals = {
-      'blank' => MethodLiteral.new(:blank?, '').freeze,
-      'empty' => MethodLiteral.new(:empty?, '').freeze,
     }
 
     def self.operators
       @@operators
     end
 
-    def self.parse_expression(parse_context, markup)
+    attr_reader :attachment
-      @@method_literals[markup] || parse_context.parse_expression(markup)
-    end
-
-    attr_reader :attachment, :child_condition
     attr_accessor :left, :operator, :right
 
     def initialize(left = nil, operator = nil, right = nil)
-      @left     = left
+      @left, @operator, @right = left, operator, right
-      @operator = operator
-      @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)
@@ -102,24 +64,20 @@ module Liquid
       "#<Condition #{[@left, @operator, @right].compact.join(' ')}>"
     end
 
-    protected
-
-    attr_reader :child_relation
-
     private
 
     def equal_variables(left, right)
-      if left.is_a?(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?(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
@@ -132,41 +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 +1,6 @@
-# frozen_string_literal: true
-
 module Liquid
+
+  
   # Context keeps the variable stack and resolves variables, as well as keywords
   #
   #   context['variable'] = 'testing'
@@ -14,49 +14,21 @@ 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
-    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)
-    def self.build(environments: {}, outer_scope: {}, registers: {}, rethrow_errors: false, resource_limits: nil, static_environments: {}, &block)
+      @environments   = [environments].flatten
-      new(environments, outer_scope, registers, rethrow_errors, resource_limits, static_environments, &block)
+      @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]
-      @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
-      @interrupts          = []
-      @filters             = []
-      @global_filter       = nil
-      @disabled_tags       = {}
-
-      self.exception_renderer = Template.default_exception_renderer
-      if rethrow_errors
-        self.exception_renderer = Liquid::RAISE_EXCEPTION_LAMBDA
-      end
-
-      yield self if block_given?
-
-      # Do this last, since it could result in this object being passed to a Proc in the environment
       squash_instance_assigns_with_environments
-    end
-    # rubocop:enable Metrics/ParameterLists
 
-    def warnings
+      @interrupts = []
-      @warnings ||= []
     end
 
     def strainer
-      @strainer ||= StrainerFactory.create(self, @filters)
+      @strainer ||= Strainer.create(self)
     end
 
     # Adds filters to this context.
@@ -65,16 +37,16 @@ module Liquid
     # for that
     def add_filters(filters)
       filters = [filters].flatten.compact
-      @filters += filters
-      @strainer = nil
-    end
 
-    def apply_global_filter(obj)
+      filters.each do |f|
-      global_filter.nil? ? obj : global_filter.call(obj)
+        raise ArgumentError, "Expected module but got: #{f.class}" unless f.is_a?(Module)
+        Strainer.add_known_filter(f)
+        strainer.extend(f)
+      end
     end
 
     # are there any not handled interrupts?
-    def interrupt?
+    def has_interrupt?
       !@interrupts.empty?
     end
 
@@ -88,22 +60,26 @@ 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" if @scopes.length > 100
     end
 
     # Merge a hash of variables in the current local scope
@@ -125,41 +101,17 @@ 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
-
-      self.class.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
-        subcontext.disabled_tags = @disabled_tags
-      end
-    end
-
     def clear_instance_assigns
       @scopes[0] = {}
     end
 
-    # Only allow String, Numeric, Hash, Array, Proc, Boolean or <tt>Liquid::Drop</tt>
-    def []=(key, value)
-      @scopes[0][key] = value
-    end
 
     # Look up variable, either resolve directly after considering the name. We can directly handle
     # Strings, digits, floats and booleans (true,false).
@@ -169,113 +121,139 @@ module Liquid
     #
     # Example:
     #   products == empty #=> products.empty?
-    def [](expression)
+    def resolve(key)        
-      evaluate(Expression.parse(expression))
+      case key
-    end
+      when nil, ""
-
+        return nil
-    def key?(key)
+      when "blank"
-      self[key] != nil
+        return :blank?
-    end
+      when "empty"
-
+        return :empty?
-    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
+      result = Parser.parse(key)   
-      variable.context = self if variable.respond_to?(:context=)
+      stack = []
 
-      variable
+      result.each do |(sym, value)|          
-    end
 
-    def lookup_and_evaluate(obj, key, raise_on_not_found: true)
+        case sym
-      if @strict_variables && raise_on_not_found && obj.respond_to?(:key?) && !obj.key?(key)
+        when :id
-        raise Liquid::UndefinedVariable, "undefined variable #{key}"
+          stack.push value
+        when :lookup
+          left = stack.pop
+          value = find_variable(left)
+          
+          stack.push(harden(value))
+        when :range
+          right = stack.pop.to_i
+          left  = stack.pop.to_i
+          
+          stack.push (left..right)
+        when :buildin
+          left = stack.pop
+          value = invoke_buildin(left, value)
+          
+          stack.push(harden(value))
+        when :call
+          left = stack.pop
+          right = stack.pop
+          value = lookup_and_evaluate(right, left)
+
+          stack.push(harden(value))
+        else 
+          raise "unknown #{sym}"
+        end
       end
 
-      value = obj[key]
+      return stack.first
-
-      if value.is_a?(Proc) && obj.respond_to?(:[]=)
-        obj[key] = value.arity == 0 ? value.call : value.call(self)
-      else
-        value
-      end
     end
 
-    def with_disabled_tags(tag_names)
+
-      tag_names.each do |name|
+    # Only allow String, Numeric, Hash, Array, Proc, Boolean or <tt>Liquid::Drop</tt>
-        @disabled_tags[name] = @disabled_tags.fetch(name, 0) + 1
+    def []=(key, value)
-      end
+      @scopes[0][key] = value
-      yield
-    ensure
-      tag_names.each do |name|
-        @disabled_tags[name] -= 1
-      end
     end
 
-    def tag_disabled?(tag_name)
+    def has_key?(key)
-      @disabled_tags.fetch(tag_name, 0) > 0
+      resolve(key) != nil
     end
 
-    protected
+    alias_method :[], :resolve
-
-    attr_writer :base_scope_depth, :warnings, :errors, :strainer, :filters, :disabled_tags
 
     private
 
-    attr_reader :base_scope_depth
+      def invoke_buildin(obj, key)
+        # as weird as this is, liquid unit tests demand that we prioritize hash lookups 
+        # to buildins. So if we got a hash and it has a :first element we need to call that 
+        # instead of sending the first message...
 
-    def try_variable_find_in_environments(key, raise_on_not_found:)
+        if obj.respond_to?(:has_key?) && obj.has_key?(key)
-      @environments.each do |environment|
+          return lookup_and_evaluate(obj, key)
-        found_variable = lookup_and_evaluate(environment, key, raise_on_not_found: raise_on_not_found)
+        end
-        if !found_variable.nil? || @strict_variables && raise_on_not_found
+
-          return found_variable
+        if obj.respond_to?(key) 
+          return obj.send(key)
+        else
+          return nil    
         end
       end
-      @static_environments.each do |environment|
-        found_variable = lookup_and_evaluate(environment, key, raise_on_not_found: raise_on_not_found)
-        if !found_variable.nil? || @strict_variables && raise_on_not_found
-          return found_variable
-        end
-      end
-      nil
-    end
 
-    def check_overflow
+      # Fetches an object starting at the local scope and then moving up the hierachy
-      raise StackLevelError, "Nesting too deep" if overflow?
+      def find_variable(key)
-    end
+        scope = @scopes.find { |s| s.has_key?(key) }
 
-    def overflow?
+        if scope.nil?
-      base_scope_depth + @scopes.length > Block::MAX_DEPTH
+          @environments.each do |e|
-    end
+            if variable = lookup_and_evaluate(e, key)
-
+              scope = e
-    def internal_error
+              break
-      # raise and catch to set backtrace and cause on exception
+            end
-      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
+
+        scope     ||= @environments.last || @scopes.last
+        variable  ||= lookup_and_evaluate(scope, key)
+
+        return variable
       end
-    end # squash_instance_assigns_with_environments
+
+      def lookup_and_evaluate(obj, key)
+        return nil unless obj.respond_to?(:[])
+        
+        if obj.is_a?(Array)
+          return nil unless key.is_a?(Integer)
+        end
+
+        value = obj[key]
+
+        if value.is_a?(Proc)      
+          # call the proc
+          value = (value.arity == 0) ? value.call : value.call(self)
+
+          # memozie if possible
+          obj[key] = value if obj.respond_to?(:[]=)
+        end
+
+        value
+      end
+
+      def harden(value)
+        value = value.to_liquid
+        value.context = self if value.respond_to?(:context=)
+        return value
+      end
+
+      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

@@ -1,65 +1,17 @@
-# frozen_string_literal: true
-
 module Liquid
-  class Document
+  class Document < Block
-    def self.parse(tokens, parse_context)
+    # we don't need markup to open this block
-      doc = new(parse_context)
+    def initialize(tokens)
-      doc.parse(tokens, parse_context)
+      parse(tokens)
-      doc
     end
 
-    attr_reader :parse_context, :body
+    # There isn't a real delimter
-
+    def block_delimiter
-    def initialize(parse_context)
+      []
-      @parse_context = parse_context
-      @body = new_body
     end
 
-    def nodelist
+    # Document blocks don't need to be terminated since they are not actually opened
-      @body.nodelist
+    def assert_missing_delimitation!
-    end
-
-    def parse(tokenizer, parse_context)
-      while parse_body(tokenizer)
-      end
-      @body.freeze
-    rescue SyntaxError => e
-      e.line_number ||= parse_context.line_number
-      raise
-    end
-
-    def unknown_tag(tag, _markup, _tokenizer)
-      case tag
-      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
-
-    def render_to_output_buffer(context, output)
-      @body.render_to_output_buffer(context, output)
-    end
-
-    def render(context)
-      render_to_output_buffer(context, +'')
-    end
-
-    private
-
-    def new_body
-      parse_context.new_block_body
-    end
-
-    def parse_body(tokenizer)
-      @body.parse(tokenizer, parse_context) do |unknown_tag_name, unknown_tag_markup|
-        if unknown_tag_name
-          unknown_tag(unknown_tag_name, unknown_tag_markup, tokenizer)
-          true
-        else
-          false
-        end
-      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.
@@ -20,61 +19,43 @@ 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
 
-    def inspect
-      self.class.to_s
-    end
-
     def to_liquid
       self
     end
 
-    def to_s
+    alias :[] :invoke_drop
-      self.class.name
-    end
 
-    alias_method :[], :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)
+      @invokable_methods ||= Set.new((public_instance_methods - Liquid::Drop.public_instance_methods).map(&:to_s))
-    end
+      @invokable_methods.include?(method_name.to_s)
-
-    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]
-        end
-
-        whitelist = [:to_liquid] + (public_instance_methods - blacklist)
-        Set.new(whitelist.map(&:to_s))
-      end
     end
   end
 end

lib/liquid/errors.rb

@@ -1,58 +1,11 @@
-# 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
-      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)
-  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)
-  DisabledError       = Class.new(Error)
-  InternalError       = Class.new(Error)
 end

lib/liquid/expression.rb

@@ -1,44 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Expression
-    LITERALS = {
-      nil => nil, 'nil' => nil, 'null' => nil, '' => nil,
-      'true' => true,
-      'false' => false,
-      'blank' => '',
-      'empty' => ''
-    }.freeze
-
-    SINGLE_QUOTED_STRING = /\A\s*'(.*)'\s*\z/m
-    DOUBLE_QUOTED_STRING = /\A\s*"(.*)"\s*\z/m
-    INTEGERS_REGEX       = /\A\s*(-?\d+)\s*\z/
-    FLOATS_REGEX         = /\A\s*(-?\d[\d\.]+)\s*\z/
-
-    # Use an atomic group (?>...) to avoid pathological backtracing from
-    # malicious input as described in https://github.com/Shopify/liquid/issues/1357
-    RANGES_REGEX         = /\A\s*\(\s*(?>(\S+)\s*\.\.)\s*(\S+)\s*\)\s*\z/
-
-    def self.parse(markup)
-      case markup
-      when nil
-        nil
-      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
-        markup = markup.strip
-        if LITERALS.key?(markup)
-          LITERALS[markup]
-        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

@@ -1,7 +1,5 @@
-# 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.
+  # A Liquid file system is way to let your templates retrieve other templates for use with the include tag.
   #
   # You can implement subclasses that retrieve templates from the database, from the file system using a different 
   # path structure, you can provide them as hard-coded inline strings, or any manner that you see fit.
@@ -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
@@ -28,46 +26,35 @@ 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.
-  # Default pattern is "_%s.liquid".
-  #
-  # Example:
-  #
-  #   file_system = Liquid::LocalFileSystem.new("/some/path", "%s.html")
-  #
-  #   file_system.full_path("index") # => "/some/path/index.html"
   #
   class LocalFileSystem
     attr_accessor :root
     
-    def initialize(root, pattern = "_%s.liquid")
+    def initialize(root)
-      @root    = root
+      @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-zA-Z0-9_\/]+$/
       
       full_path = if template_path.include?('/')
-        File.join(root, File.dirname(template_path), @pattern % File.basename(template_path))
+        File.join(root, File.dirname(template_path), "_#{File.basename(template_path)}.liquid")
       else
-        File.join(root, @pattern % template_path)
+        File.join(root, "_#{template_path}.liquid")
       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) =~ /^#{File.expand_path(root)}/
       
       full_path
     end

lib/liquid/forloop_drop.rb

@@ -1,49 +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 :length, :parentloop
-
-    def name
-      Usage.increment('forloop_drop_name')
-      @name
-    end
-
-    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/htmltags.rb

@@ -0,0 +1,119 @@
+module Liquid
+  class TableRow < Block
+    Syntax = /(\w+)\s+in\s+(#{QuotedFragment}+)/o
+
+    def initialize(tag_name, markup, tokens)
+      if markup =~ Syntax
+        @variable_name = $1
+        @collection_name = $2
+        @idx_i = "#{$1}-#{$2}-i"
+        @idx_col = "#{$1}-#{$2}-c"
+        @attributes = {}
+        markup.scan(TagAttributes) do |key, value|
+          @attributes[key] = value
+        end
+      else
+        raise SyntaxError.new("Syntax Error in 'table_row loop' - Valid syntax: table_row [item] in [collection] cols=3")
+      end
+
+      super
+    end
+
+    def render(context)
+      context.registers[:tablerowloop] ||= Hash.new(0)
+
+      collection = context[@collection_name] or return ''
+
+      from = @attributes['offset'] ? context[@attributes['offset']].to_i : 0
+      to = @attributes['limit'] ? from + context[@attributes['limit']].to_i : nil
+
+      collection = Utils.slice_collection_using_each(collection, from, to)
+
+      length = collection.length
+
+      cols = context[@attributes['cols']].to_i
+
+      row = 1
+      col = 0
+
+      result = ["<tr class=\"row1\">\n"]
+      context.stack do
+
+        context.registers[:tablerowloop][@idx]
+        context['tablerowloop'] = lambda { Tablerowloop.new(@idx_i, @idx_col, length) }
+        collection.each_with_index do |item, index|
+          context.registers[:tablerowloop][@idx_i] = index
+          context.registers[:tablerowloop][@idx_col] = col
+          context[@variable_name] = item          
+
+          col += 1
+
+          result << "<td class=\"col#{col}\">" << render_all(@nodelist, context) << '</td>'
+
+          if col == cols and not (index == length - 1)
+            col  = 0
+            row += 1
+            result << "</tr>\n<tr class=\"row#{row}\">"
+          end
+
+        end
+      end
+      result << "</tr>\n"
+      result
+    end
+
+
+
+    private
+
+      class Tablerowloop < Liquid::Drop
+        attr_accessor :length
+
+        def initialize(idx_i, idx_col, length)
+          @idx_i, @idx_col, @length = idx_i, idx_col, length
+        end
+
+        def index
+          @context.registers[:tablerowloop][@idx_i] + 1
+        end
+
+        def index0
+          @context.registers[:tablerowloop][@idx_i]
+        end
+
+        def rindex
+          length - @context.registers[:tablerowloop][@idx_i]
+        end
+
+        def rindex0
+          length - @context.registers[:tablerowloop][@idx_i] - 1
+        end
+
+        def first
+          (@context.registers[:tablerowloop][@idx_i] == 0)
+        end
+
+        def last
+          (@context.registers[:tablerowloop][@idx_i] == length - 1)
+        end
+
+        def col
+          @context.registers[:tablerowloop][@idx_col] + 1
+        end
+
+        def col0
+          @context.registers[:tablerowloop][@idx_col]
+        end
+
+        def col_first
+          (@context.registers[:tablerowloop][@idx_col] == 0)
+        end
+
+        def col_last
+          (@context.registers[:tablerowloop][@idx_col] == cols - 1)
+        end
+      end
+  end
+
+  Template.register_tag('tablerow', TableRow)
+end

lib/liquid/i18n.rb

@@ -1,41 +0,0 @@
-# frozen_string_literal: true
-
-require 'yaml'
-
-module Liquid
-  class I18n
-    DEFAULT_LOCALE = File.join(File.expand_path(__dir__), "locales", "en.yml")
-
-    TranslationError = Class.new(StandardError)
-
-    attr_reader :path
-
-    def initialize(path = DEFAULT_LOCALE)
-      @path = path
-    end
-
-    def translate(name, vars = {})
-      interpolate(deep_fetch_translation(name), vars)
-    end
-    alias_method :t, :translate
-
-    def locale
-      @locale ||= YAML.load_file(@path)
-    end
-
-    private
-
-    def interpolate(name, vars)
-      name.gsub(/%\{(\w+)\}/) do
-        # raise TranslationError, "Undefined key #{$1} for interpolation in translation #{name}"  unless vars[$1.to_sym]
-        (vars[Regexp.last_match(1).to_sym]).to_s
-      end
-    end
-
-    def deep_fetch_translation(name)
-      name.split('.').reduce(locale) do |level, cur|
-        level[cur] || raise(TranslationError, "Translation for #{name} does not exist in locale #{path}")
-      end
-    end
-  end
-end

lib/liquid/interrupts.rb

@@ -1,11 +1,10 @@
-# 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"
     end
   end

lib/liquid/lexer.rb

@@ -1,62 +0,0 @@
-# frozen_string_literal: true
-
-require "strscan"
-module Liquid
-  class Lexer
-    SPECIALS = {
-      '|' => :pipe,
-      '.' => :dot,
-      ':' => :colon,
-      ',' => :comma,
-      '[' => :open_square,
-      ']' => :close_square,
-      '(' => :open_round,
-      ')' => :close_round,
-      '?' => :question,
-      '-' => :dash,
-    }.freeze
-    IDENTIFIER            = /[a-zA-Z_][\w-]*\??/
-    SINGLE_STRING_LITERAL = /'[^\']*'/
-    DOUBLE_STRING_LITERAL = /"[^\"]*"/
-    NUMBER_LITERAL        = /-?\d+(\.\d+)?/
-    DOTDOT                = /\.\./
-    COMPARISON_OPERATOR   = /==|!=|<>|<=?|>=?|contains(?=\s)/
-    WHITESPACE_OR_NOTHING = /\s*/
-
-    def initialize(input)
-      @ss = StringScanner.new(input)
-    end
-
-    def tokenize
-      @output = []
-
-      until @ss.eos?
-        @ss.skip(WHITESPACE_OR_NOTHING)
-        break if @ss.eos?
-        tok      = if (t = @ss.scan(COMPARISON_OPERATOR))
-          [:comparison, t]
-        elsif (t = @ss.scan(SINGLE_STRING_LITERAL))
-          [:string, t]
-        elsif (t = @ss.scan(DOUBLE_STRING_LITERAL))
-          [:string, 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])
-            [s, c]
-          else
-            raise SyntaxError, "Unexpected character #{c}"
-          end
-        end
-        @output << tok
-      end
-
-      @output << [:end_of_string]
-    end
-  end
-end

lib/liquid/locales/en.yml

@@ -1,29 +0,0 @@
----
-  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]"
-      case_invalid_when: "Syntax Error in tag 'case' - Valid when condition: {% when [condition] [or condition2...] %}"
-      case_invalid_else: "Syntax Error in tag 'case' - Valid else condition: {% else %} (no parameters) "
-      cycle: "Syntax Error in 'cycle' - Valid syntax: cycle [name :] var [, var2, var3 ...]"
-      for: "Syntax Error in 'for loop' - Valid syntax: for [item] in [collection]"
-      for_invalid_in: "For loops require an 'in' clause"
-      for_invalid_attribute: "Invalid attribute in for loop. Valid attributes are limit and offset"
-      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}"
-      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"
-      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"
-      inline_comment_invalid: "Syntax error in tag '#' - Each line of comments must be prefixed by the '#' character"
-    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 usesd 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

@@ -1,54 +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 new_block_body
-      Liquid::BlockBody.new
-    end
-
-    def new_tokenizer(markup, start_line_number: nil, for_liquid_tag: false)
-      Tokenizer.new(markup, line_number: start_line_number, for_liquid_tag: for_liquid_tag)
-    end
-
-    def parse_expression(markup)
-      Expression.parse(markup)
-    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

@@ -1,102 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Parser
-    def initialize(input)
-      l       = Lexer.new(input)
-      @tokens = l.tokenize
-      @p      = 0 # pointer to current location
-    end
-
-    def jump(point)
-      @p = point
-    end
-
-    def consume(type = nil)
-      token = @tokens[@p]
-      if type && token[0] != type
-        raise SyntaxError, "Expected #{type} but found #{@tokens[@p].first}"
-      end
-      @p += 1
-      token[1]
-    end
-
-    # Only consumes the token if it matches the type
-    # Returns the token's contents if it was consumed
-    # or false otherwise.
-    def consume?(type)
-      token = @tokens[@p]
-      return false unless token && token[0] == type
-      @p += 1
-      token[1]
-    end
-
-    # Like consume? Except for an :id token of a certain name
-    def id?(str)
-      token = @tokens[@p]
-      return false unless token && token[0] == :id
-      return false unless token[1] == str
-      @p += 1
-      token[1]
-    end
-
-    def look(type, ahead = 0)
-      tok = @tokens[@p + ahead]
-      return false unless tok
-      tok[0] == type
-    end
-
-    def expression
-      token = @tokens[@p]
-      case token[0]
-      when :id
-        str = consume
-        str << variable_lookups
-      when :open_square
-        str = consume
-        str << expression
-        str << consume(:close_square)
-        str << variable_lookups
-      when :string, :number
-        consume
-      when :open_round
-        consume
-        first = expression
-        consume(:dotdot)
-        last = expression
-        consume(:close_round)
-        "(#{first}..#{last})"
-      else
-        raise SyntaxError, "#{token} is not a valid expression"
-      end
-    end
-
-    def argument
-      str = +""
-      # might be a keyword argument (identifier: expression)
-      if look(:id) && look(:colon, 1)
-        str << consume << consume << ' '
-      end
-
-      str << expression
-      str
-    end
-
-    def variable_lookups
-      str = +""
-      loop do
-        if look(:open_square)
-          str << consume
-          str << expression
-          str << consume(:close_square)
-        elsif look(:dot)
-          str << consume
-          str << consume(:id)
-        else
-          break
-        end
-      end
-      str
-    end
-  end
-end

lib/liquid/parser_switching.rb

@@ -1,45 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  module ParserSwitching
-    def strict_parse_with_error_mode_fallback(markup)
-      strict_parse_with_error_context(markup)
-    rescue SyntaxError => e
-      case parse_context.error_mode
-      when :strict
-        raise
-      when :warn
-        parse_context.warnings << e
-      end
-      lax_parse(markup)
-    end
-
-    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
-          strict_parse_with_error_context(markup)
-        rescue SyntaxError => e
-          parse_context.warnings << e
-          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

@@ -1,24 +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
-
-      template_factory = (context.registers[:template_factory] ||= Liquid::TemplateFactory.new)
-      template = template_factory.for(template_name)
-
-      partial = template.parse(source, parse_context)
-      cached_partials[template_name] = partial
-    ensure
-      parse_context.partial = false
-    end
-  end
-end

lib/liquid/profiler.rb

@@ -1,139 +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.
-  #     # The top-level template name is `nil` by default, but can be set in the Liquid::Context before rendering.
-  #     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, :template_name, :line_number, :children
-      attr_accessor :total_time
-      alias_method :render_time, :total_time
-      alias_method :partial, :template_name
-
-      def initialize(code: nil, template_name: nil, line_number: nil)
-        @code = code
-        @template_name = template_name
-        @line_number = line_number
-        @children = []
-      end
-
-      def self_time
-        @self_time ||= begin
-          total_children_time = 0.0
-          @children.each do |child|
-            total_children_time += child.total_time
-          end
-          @total_time - total_children_time
-        end
-      end
-    end
-
-    attr_reader :total_time
-    alias_method :total_render_time, :total_time
-
-    def initialize
-      @root_children = []
-      @current_children = nil
-      @total_time = 0.0
-    end
-
-    def profile(template_name, &block)
-      # nested renders are done from a tag that already has a timing node
-      return yield if @current_children
-
-      root_children = @root_children
-      render_idx = root_children.length
-      begin
-        @current_children = root_children
-        profile_node(template_name, &block)
-      ensure
-        @current_children = nil
-        if (timing = root_children[render_idx])
-          @total_time += timing.total_time
-        end
-      end
-    end
-
-    def children
-      children = @root_children
-      if children.length == 1
-        children.first.children
-      else
-        children
-      end
-    end
-
-    def each(&block)
-      children.each(&block)
-    end
-
-    def [](idx)
-      children[idx]
-    end
-
-    def length
-      children.length
-    end
-
-    def profile_node(template_name, code: nil, line_number: nil)
-      timing = Timing.new(code: code, template_name: template_name, line_number: line_number)
-      parent_children = @current_children
-      start_time = monotonic_time
-      begin
-        @current_children = timing.children
-        yield
-      ensure
-        @current_children = parent_children
-        timing.total_time = monotonic_time - start_time
-        parent_children << timing
-      end
-    end
-
-    private
-
-    def monotonic_time
-      Process.clock_gettime(Process::CLOCK_MONOTONIC)
-    end
-  end
-end

lib/liquid/profiler/hooks.rb

@@ -1,35 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  module BlockBodyProfilingHook
-    def render_node(context, output, node)
-      if (profiler = context.profiler)
-        profiler.profile_node(context.template_name, code: node.raw, line_number: node.line_number) do
-          super
-        end
-      else
-        super
-      end
-    end
-  end
-  BlockBody.prepend(BlockBodyProfilingHook)
-
-  module DocumentProfilingHook
-    def render_to_output_buffer(context, output)
-      return super unless context.profiler
-      context.profiler.profile(context.template_name) { super }
-    end
-  end
-  Document.prepend(DocumentProfilingHook)
-
-  module ContextProfilingHook
-    attr_accessor :profiler
-
-    def new_isolated_subcontext
-      new_context = super
-      new_context.profiler = profiler
-      new_context
-    end
-  end
-  Context.prepend(ContextProfilingHook)
-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/resource_limits.rb

@@ -1,62 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class ResourceLimits
-    attr_accessor :render_length_limit, :render_score_limit, :assign_score_limit
-    attr_reader :render_score, :assign_score
-
-    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 increment_render_score(amount)
-      @render_score += amount
-      raise_limits_reached if @render_score_limit && @render_score > @render_score_limit
-    end
-
-    def increment_assign_score(amount)
-      @assign_score += amount
-      raise_limits_reached if @assign_score_limit && @assign_score > @assign_score_limit
-    end
-
-    # update either render_length or assign_score based on whether or not the writes are captured
-    def increment_write_score(output)
-      if (last_captured = @last_capture_length)
-        captured = output.bytesize
-        increment = captured - last_captured
-        @last_capture_length = captured
-        increment_assign_score(increment)
-      elsif @render_length_limit && output.bytesize > @render_length_limit
-        raise_limits_reached
-      end
-    end
-
-    def raise_limits_reached
-      @reached_limit = true
-      raise MemoryError, "Memory limits exceeded"
-    end
-
-    def reached?
-      @reached_limit
-    end
-
-    def reset
-      @reached_limit = false
-      @last_capture_length = nil
-      @render_score = @assign_score = 0
-    end
-
-    def with_capture
-      old_capture_length = @last_capture_length
-      begin
-        @last_capture_length = 0
-        yield
-      ensure
-        @last_capture_length = old_capture_length
-      end
-    end
-  end
-end

lib/liquid/standardfilters.rb

@@ -1,36 +1,21 @@
-# frozen_string_literal: true
-
 require 'cgi'
-require 'bigdecimal'
 
 module Liquid
+
   module StandardFilters
-    HTML_ESCAPE = {
-      '&' => '&',
-      '>' => '>',
-      '<' => '&lt;',
-      '"' => '&quot;',
-      "'" => '&#39;',
-    }.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)
+
       input.respond_to?(:size) ? input.size : 0
     end
 
-    # convert an input string to DOWNCASE
+    # convert a input string to DOWNCASE
     def downcase(input)
       input.to_s.downcase
     end
 
-    # convert an input string to UPCASE
+    # convert a input string to UPCASE
     def upcase(input)
       input.to_s.upcase
     end
@@ -41,63 +26,31 @@ module Liquid
     end
 
     def escape(input)
-      CGI.escapeHTML(input.to_s) 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)
+      ActionView::Helpers::TagHelper.escape_once(input)
+    rescue NameError
+      input
     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 = "...")
-      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.length > length.to_i ? input[0...l] + truncate_string : input
-      input_str.length > length ? input_str[0...l].concat(truncate_string_str) : input_str
     end
 
     def truncatewords(input, words = 15, truncate_string = "...")
-      return if input.nil?
+      if input.nil? then return end
-      input = input.to_s
+      wordlist = input.to_s.split
-      words = Utils.to_integer(words)
+      l = words.to_i - 1
-      words = 1 if words <= 0
+      l = 0 if l < 0
-
+      wordlist.length > l ? wordlist[0..l].join(" ") + truncate_string : input
-      wordlist = input.split(" ", words + 1)
-      return input if wordlist.length <= words
-
-      wordlist.pop
-      wordlist.join(" ").concat(truncate_string.to_s)
     end
 
     # Split input string into an array of substrings separated by given pattern.
@@ -106,176 +59,65 @@ 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)
-      input.to_s.strip
-    end
-
-    def lstrip(input)
-      input.to_s.lstrip
-    end
-
-    def rstrip(input)
-      input.to_s.rstrip
     end
 
     def strip_html(input)
-      empty  = ''
+      input.to_s.gsub(/<script.*?<\/script>/, '').gsub(/<!--.*?-->/, '').gsub(/<.*?>/, '')
-      result = input.to_s.gsub(STRIP_HTML_BLOCKS, 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(/\n/, '')
     end
 
+
     # Join elements of the array with certain character between them
     def join(input, glue = ' ')
-      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 = [input].flatten
-
-      return [] if ary.empty?
-
       if property.nil?
-        ary.sort do |a, b|
+        ary.sort
-          nil_safe_compare(a, b)
+      elsif ary.first.respond_to?('[]') 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.reverse
-    end
-
     # map/collect on a given property
     def map(input, property)
-      InputIterator.new(input, context).map do |e|
+      ary = [input].flatten
-        e = e.call if e.is_a?(Proc)
+      if ary.first.respond_to?('[]') and !ary.first[property].nil?
-
+        ary.map {|e| e[property] }
-        if property == "to_liquid"
+      elsif ary.first.respond_to?(property)
-          e
+        ary.map {|e| e.send(property) }
-        elsif e.respond_to?(:[])
-          r = 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 = '')
-      input.to_s.gsub(string.to_s, replacement.to_s)
+      input.to_s.gsub(string, replacement)
     end
 
     # Replace the first occurrences of a string with another
     def replace_first(input, string, replacement = '')
-      input.to_s.sub(string.to_s, replacement.to_s)
+      input.to_s.sub(string, replacement)
     end
 
     # remove a substring
     def remove(input, string)
-      input.to_s.gsub(string.to_s, '')
+      input.to_s.gsub(string, '')
     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, '')
     end
 
     # add one string to another
@@ -283,13 +125,6 @@ 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
@@ -297,10 +132,10 @@ module Liquid
 
     # Add <br /> tags in front of all newlines in input string
     def newline_to_br(input)
-      input.to_s.gsub(/\r?\n/, "<br />\n")
+      input.to_s.gsub(/\n/, "<br />\n")
     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'')
@@ -314,7 +149,6 @@ 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
@@ -329,14 +163,25 @@ 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) && !/^\d+$/.match(input.to_s).nil?) || input.is_a?(Integer)) && input.to_i > 0
+        input = Time.at(input.to_i)
+      end
+
+      date = input.is_a?(String) ? Time.parse(input) : input
+
+      if date.respond_to?(:strftime)
+        date.strftime(format.to_s)
+      else
+        input
+      end
+    rescue => e
+      input
     end
 
     # Get the first element of the passed in array
@@ -357,170 +202,43 @@ 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, :+)
+      to_number(input) + to_number(operand)
     end
 
     # subtraction
     def minus(input, operand)
-      apply_operation(input, operand, :-)
+      to_number(input) - to_number(operand)
     end
 
     # multiplication
     def times(input, operand)
-      apply_operation(input, operand, :*)
+      to_number(input) * to_number(operand)
     end
 
     # division
     def divided_by(input, operand)
-      apply_operation(input, operand, :/)
+      to_number(input) / to_number(operand)
-    rescue ::ZeroDivisionError => e
-      raise Liquid::ZeroDivisionError, e.message
     end
 
     def modulo(input, operand)
-      apply_operation(input, operand, :%)
+      to_number(input) % to_number(operand)
-    rescue ::ZeroDivisionError => e
-      raise Liquid::ZeroDivisionError, e.message
-    end
-
-    def round(input, n = 0)
-      result = Utils.to_number(input).round(Utils.to_number(n))
-      result = result.to_f if result.is_a?(BigDecimal)
-      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 to_number(obj)
-
+        case obj
-    def raise_property_error(property)
+        when Numeric
-      raise Liquid::ArgumentError, "cannot select the property '#{property}'"
+          obj
-    end
+        when String
-
+          (obj.strip =~ /^\d+\.\d+$/) ? obj.to_f : obj.to_i
-    def apply_operation(input, operand, operation)
-      result = Utils.to_number(input).send(operation, Utils.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)
+          0
         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

@@ -1,44 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class StaticRegisters
-    attr_reader :static
-
-    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
-
-    UNDEFINED = Object.new
-
-    def fetch(key, default = UNDEFINED, &block)
-      if @registers.key?(key)
-        @registers.fetch(key)
-      elsif default != UNDEFINED
-        @static.fetch(key, default, &block)
-      else
-        @static.fetch(key, &block)
-      end
-    end
-
-    def key?(key)
-      @registers.key?(key) || @static.key?(key)
-    end
-  end
-end

lib/liquid/strainer.rb

@@ -0,0 +1,53 @@
+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:
+    @@filters = {}
+    @@known_filters = Set.new
+    @@known_methods = Set.new
+
+    def initialize(context)
+      @context = context
+    end
+
+    def self.global_filter(filter)
+      raise ArgumentError, "Passed filter is not a module" unless filter.is_a?(Module)
+      add_known_filter(filter)
+      @@filters[filter.name] = filter
+    end
+
+    def self.add_known_filter(filter)
+      unless @@known_filters.include?(filter)
+        @@method_blacklist ||= Set.new(Strainer.instance_methods.map(&:to_s))
+        new_methods = filter.instance_methods.map(&:to_s)
+        new_methods.reject!{ |m| @@method_blacklist.include?(m) }
+        @@known_methods.merge(new_methods)
+        @@known_filters.add(filter)
+      end
+    end
+
+    def self.create(context)
+      strainer = Strainer.new(context)
+      @@filters.each { |k,m| strainer.extend(m) }
+      strainer
+    end
+
+    def invoke(method, *args)
+      if invokable?(method)
+        send(method, *args)
+      else
+        args.first
+      end
+    end
+
+    def invokable?(method)
+      @@known_methods.include?(method.to_s) && respond_to?(method)
+    end
+  end
+end

lib/liquid/strainer_factory.rb

@@ -1,36 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  # StrainerFactory is the factory for the filters system.
-  module StrainerFactory
-    extend self
-
-    def add_global_filter(filter)
-      strainer_class_cache.clear
-      global_filters << filter
-    end
-
-    def create(context, filters = [])
-      strainer_from_cache(filters).new(context)
-    end
-
-    private
-
-    def global_filters
-      @global_filters ||= []
-    end
-
-    def strainer_from_cache(filters)
-      strainer_class_cache[filters] ||= begin
-        klass = Class.new(StrainerTemplate)
-        global_filters.each { |f| klass.add_filter(f) }
-        filters.each { |f| klass.add_filter(f) }
-        klass
-      end
-    end
-
-    def strainer_class_cache
-      @strainer_class_cache ||= {}
-    end
-  end
-end

lib/liquid/strainer_template.rb

@@ -1,53 +0,0 @@
-# frozen_string_literal: true
-
-require 'set'
-
-module Liquid
-  # StrainerTemplate is the computed 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 StrainerFactory.add_global_filter,
-  # Context#add_filters or Template.register_filter
-  class StrainerTemplate
-    def initialize(context)
-      @context = context
-    end
-
-    class << self
-      def add_filter(filter)
-        return if include?(filter)
-
-        invokable_non_public_methods = (filter.private_instance_methods + filter.protected_instance_methods).select { |m| invokable?(m) }
-        if invokable_non_public_methods.any?
-          raise MethodOverrideError, "Filter overrides registered public methods as non public: #{invokable_non_public_methods.join(', ')}"
-        end
-
-        include(filter)
-
-        filter_methods.merge(filter.public_instance_methods.map(&:to_s))
-      end
-
-      def invokable?(method)
-        filter_methods.include?(method.to_s)
-      end
-
-      private
-
-      def filter_methods
-        @filter_methods ||= Set.new
-      end
-    end
-
-    def invoke(method, *args)
-      if self.class.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
-    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

@@ -1,65 +1,26 @@
-# frozen_string_literal: true
-
 module Liquid
+
   class Tag
-    attr_reader :nodelist, :tag_name, :line_number, :parse_context
-    alias_method :options, :parse_context
-    include ParserSwitching
 
-    class << self
+    attr_accessor :nodelist
-      def parse(tag_name, markup, tokenizer, parse_context)
-        tag = new(tag_name, markup, parse_context)
-        tag.parse(tokenizer)
-        tag
-      end
 
-      def disable_tags(*tag_names)
+    def initialize(tag_name, markup, tokens)
-        @disabled_tags ||= []
+      @tag_name   = tag_name
-        @disabled_tags.concat(tag_names)
+      @markup     = markup
-        prepend(Disabler)
+      parse(tokens)
-      end
-
-      private :new
     end
 
-    def initialize(tag_name, markup, parse_context)
+    def parse(tokens)
-      @tag_name      = tag_name
-      @markup        = markup
-      @parse_context = parse_context
-      @line_number   = parse_context.line_number
-    end
-
-    def parse(_tokens)
-    end
-
-    def raw
-      "#{@tag_name} #{@markup}"
     end
 
     def name
       self.class.name.downcase
     end
 
-    def render(_context)
+    def render(context)
       ''
     end
 
-    # For backwards compatibility with custom tags. In a future release, the semantics
+  end # Tag
-    # 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?
+end # Tag
-      false
-    end
-
-    private
-
-    def parse_expression(markup)
-      parse_context.parse_expression(markup)
-    end
-  end
-end

lib/liquid/tag/disableable.rb

@@ -1,22 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Tag
-    module Disableable
-      def render_to_output_buffer(context, output)
-        if context.tag_disabled?(tag_name)
-          output << disabled_error(context)
-          return
-        end
-        super
-      end
-
-      def disabled_error(context)
-        # raise then rescue the exception so that the Context#exception_renderer can re-raise it
-        raise DisabledError, "#{tag_name} #{parse_context[:locale].t('errors.disabled.tag')}"
-      rescue DisabledError => exc
-        context.handle_error(exc, line_number)
-      end
-    end
-  end
-end

lib/liquid/tag/disabler.rb

@@ -1,21 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Tag
-    module Disabler
-      module ClassMethods
-        attr_reader :disabled_tags
-      end
-
-      def self.prepended(base)
-        base.extend(ClassMethods)
-      end
-
-      def render_to_output_buffer(context, output)
-        context.with_disabled_tags(self.class.disabled_tags) do
-          super
-        end
-      end
-    end
-  end
-end

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' %}
@@ -10,63 +9,24 @@ module Liquid
   #  {{ foo }}
   #
   class Assign < Tag
-    Syntax = /(#{VariableSignature}+)\s*=\s*(.*)\s*/om
+    Syntax = /(#{VariableSignature}+)\s*=\s*(.*)\s*/o
   
-    # @api private
+    def initialize(tag_name, markup, tokens)          
-    def self.raise_syntax_error(parse_context)
-      raise Liquid::SyntaxError, parse_context.locale.t('errors.syntax.assign')
-    end
-
-    attr_reader :to, :from
-
-    def initialize(tag_name, markup, parse_context)
-      super
       if markup =~ Syntax
-        @to   = Regexp.last_match(1)
+        @to = $1
-        @from = Variable.new(Regexp.last_match(2), parse_context)
+        @from = Variable.new($2)
       else
-        self.class.raise_syntax_error(parse_context)
+        raise SyntaxError.new("Syntax Error in 'assign' - Valid syntax: assign [var] = [source]")
       end
+      
+      super      
     end
   
-    def render_to_output_buffer(context, output)
+    def render(context)
-      val = @from.render(context)
+       context.scopes.last[@to] = @from.render(context)
-      context.scopes.last[@to] = val
+       ''
-      context.resource_limits.increment_assign_score(assign_score_of(val))
-      output
     end 
   
-    def blank?
-      true
-    end
-
-    private
-
-    def assign_score_of(val)
-      if val.instance_of?(String)
-        val.bytesize
-      elsif val.instance_of?(Array)
-        sum = 1
-        # Uses #each to avoid extra allocations.
-        val.each { |child| sum += assign_score_of(child) }
-        sum
-      elsif val.instance_of?(Hash)
-        sum = 1
-        val.each do |key, entry_value|
-          sum += assign_score_of(key)
-          sum += assign_score_of(entry_value)
-        end
-        sum
-      else
-        1
-      end
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        [@node.from]
-      end
-    end
   end  
   
   Template.register_tag('assign', Assign)  

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:
@@ -11,12 +10,11 @@ module Liquid
   #    {% endfor %}
   # 
   class Break < Tag 
-    INTERRUPT = BreakInterrupt.new.freeze
 
-    def render_to_output_buffer(context, output)
+    def interrupt
-      context.push_interrupt(INTERRUPT)
+      BreakInterrupt.new
-      output
     end
+
   end
 
   Template.register_tag('break', Break)

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 %}
@@ -13,27 +12,22 @@ module Liquid
   # in a sidebar or footer.
   #
   class Capture < Block
-    Syntax = /(#{VariableSignature}+)/o
+    Syntax = /(\w+)/
 
-    def initialize(tag_name, markup, options)
+    def initialize(tag_name, markup, tokens)
-      super
       if markup =~ Syntax
-        @to = Regexp.last_match(1)
+        @to = $1
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.capture")
+        raise SyntaxError.new("Syntax Error in 'capture' - Valid syntax: capture [var]")
       end
+
+      super
     end
 
-    def render_to_output_buffer(context, output)
+    def render(context)
-      context.resource_limits.with_capture do
+      output = super
-        capture_output = render(context)
+      context.scopes.last[@to] = output
-        context.scopes.last[@to] = capture_output
+      ''
-      end
-      output
-    end
-
-    def blank?
-      true
     end
   end
 

lib/liquid/tags/case.rb

@@ -1,41 +1,22 @@
-# frozen_string_literal: true
-
 module Liquid
   class Case < Block
     Syntax     = /(#{QuotedFragment})/o
-    WhenSyntax = /(#{QuotedFragment})(?:(?:\s+or\s+|\s*\,\s*)(#{QuotedFragment}.*))?/om
+    WhenSyntax = /(#{QuotedFragment})(?:(?:\s+or\s+|\s*\,\s*)(#{QuotedFragment}.*))?/o
 
-    attr_reader :blocks, :left
+    def initialize(tag_name, markup, tokens)      
-
-    def initialize(tag_name, markup, options)
-      super
       @blocks = []
       
       if markup =~ Syntax
-        @left = parse_expression(Regexp.last_match(1))
+        @left = $1
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.case")
+        raise SyntaxError.new("Syntax Error in tag 'case' - Valid syntax: case [condition]")
       end
-    end
             
-    def parse(tokens)
+      super
-      body = case_body = new_body
-      body = @blocks.last.attachment while parse_body(body, tokens)
-      @blocks.reverse_each do |condition|
-        body = condition.attachment
-        unless body.frozen?
-          body.remove_blank_strings if blank?
-          body.freeze
-        end
-      end
-      case_body.freeze
-    end
-
-    def nodelist
-      @blocks.map(&:attachment)
     end
 
     def unknown_tag(tag, markup, tokens)
+      @nodelist = []
       case tag
       when 'when'
         record_when_condition(markup)
@@ -46,54 +27,52 @@ module Liquid
       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 = new_body
-
       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
-        end
+      	  raise SyntaxError.new("Syntax Error in tag 'case' - Valid when condition: {% when [condition] [or condition2...] %} ")
+      	end
 
-        markup = Regexp.last_match(2)
+      	markup = $2
 
-        block = Condition.new(@left, '==', Condition.parse_expression(parse_context, Regexp.last_match(1)))
+      	block = Condition.new(@left, '==', $1)        
-        block.attach(body)
+      	block.attach(@nodelist)
-        @blocks << block
+      	@blocks.push(block)
       end
     end
 
     def record_else_condition(markup)            
-      unless markup.strip.empty?
+
-        raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_else")
+      if not markup.strip.empty?
+        raise SyntaxError.new("Syntax Error in tag 'case' - Valid else condition: {% else %} (no parameters) ")
       end
          
       block = ElseCondition.new            
-      block.attach(new_body)
+      block.attach(@nodelist)
       @blocks << block
     end
     
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
+        
-      def children
-        [@node.left] + @node.blocks
-      end
-    end
   end    
   
   Template.register_tag('case', Case)

lib/liquid/tags/comment.rb

@@ -1,16 +1,7 @@
-# frozen_string_literal: true
-
 module Liquid
   class Comment < Block
-    def render_to_output_buffer(_context, output)
+    def render(context)
-      output
+      ''
-    end
-
-    def unknown_tag(_tag, _markup, _tokens)
-    end
-
-    def blank?
-      true
     end
   end
 

lib/liquid/tags/continue.rb

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

lib/liquid/tags/cycle.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+  
   # Cycle is usually used within a loop to alternate between values, like colors or DOM classes.
   #
   #   {% for item in items %}
@@ -14,62 +13,46 @@ module Liquid
   #    <div class="green"> Item five</div>
   #
   class Cycle < Tag
-    SimpleSyntax = /\A#{QuotedFragment}+/o
+    SimpleSyntax = /^#{QuotedFragment}+/o
-    NamedSyntax  = /\A(#{QuotedFragment})\s*\:\s*(.*)/om
+    NamedSyntax  = /^(#{QuotedFragment})\s*\:\s*(.*)/o
   
-    attr_reader :variables
+    def initialize(tag_name, markup, tokens)      
-
-    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      = parse_expression(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("Syntax Error in 'cycle' - Valid syntax: cycle [name :] var [, var2, var3 ...]")
       end
+      super    
     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
-
-      output << val
-
-      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
+    	  var =~ /\s*(#{QuotedFragment})\s*/o
-        Regexp.last_match(1) ? parse_expression(Regexp.last_match(1)) : nil
+    	  $1 ? $1 : nil
-      end.compact
+    	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.
@@ -20,18 +19,20 @@ module Liquid
   #    Hello: -3
   #
   class Decrement < Tag
-    def initialize(tag_name, markup, options)
+    def initialize(tag_name, markup, tokens)      
-      super
       @variable = markup.strip
+
+      super    
     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)

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:
   #
@@ -43,184 +42,126 @@ 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
+    Syntax = /(\w+)\s+in\s+(#{QuotedFragment}+)\s*(reversed)?/o
   
-    attr_reader :collection_name, :variable_name, :limit, :from
+    def initialize(tag_name, markup, tokens)
+      if markup =~ Syntax
+        @variable_name = $1
+        @collection_name = $2
+        @name = "#{$1}-#{$2}"         
+        @idx = "#{@name}-i"
+        @reversed = $3             
+        @attributes = {}
+        markup.scan(TagAttributes) do |key, value|
+          @attributes[key] = value
+        end        
+      else
+        raise SyntaxError.new("Syntax Error in 'for loop' - Valid syntax: for [item] in [collection]")
+      end
 
-    def initialize(tag_name, markup, options)
+      @nodelist = @for_block = []
       super
-      @from = @limit = nil
-      parse_with_selected_parser(markup)
-      @for_block = new_body
-      @else_block = nil
-    end
-
-    def parse(tokens)
-      if parse_body(@for_block, tokens)
-        parse_body(@else_block, tokens)
-      end
-      if blank?
-        @else_block&.remove_blank_strings
-        @for_block.remove_blank_strings
-      end
-      @else_block&.freeze
-      @for_block.freeze
-    end
-
-    def nodelist
-      @else_block ? [@for_block, @else_block] : [@for_block]
     end
 
     def unknown_tag(tag, markup, tokens)
       return super unless tag == 'else'
-      @else_block = new_body
+      @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'] == 'continue'
+        context.registers[:for][@name].to_i
       else
-        render_segment(context, output, segment)
+        context[@attributes['offset']].to_i
       end
         
-      output
+      limit = context[@attributes['limit']]
-    end
+      to    = limit ? limit.to_i + from : nil  
 
-    protected
+      segment = Utils.slice_collection_using_each(collection, from, to)
 
-    def lax_parse(markup)
+      return render_else(context) if segment.empty?
-      if markup =~ Syntax
+      
-        @variable_name   = Regexp.last_match(1)
+      segment.reverse! if @reversed
-        collection_name  = Regexp.last_match(2)
+
-        @reversed        = !!Regexp.last_match(3)
+      result = []
-        @name            = "#{@variable_name}-#{collection_name}"
+        
-        @collection_name = parse_expression(collection_name)
+      length = segment.length            
-        markup.scan(TagAttributes) do |key, value|
+            
-          set_attribute(key, value)
+      # Store our progress through the collection for the continue flag
+      context.registers[:for][@name] = from + segment.length
+              
+      context.stack do
+        context['forloop'] = lambda { Forloop.new(@name, @idx, length) }
+        segment.each_with_index do |item, index|
+          context.registers[:for][@idx] = index
+          context[@variable_name] = item
+
+          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
-      else
-        raise SyntaxError, options[:locale].t("errors.syntax.for")
       end
-    end
+      result     
-
-    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')
-
-      collection_name  = p.expression
-      @collection_name = parse_expression(collection_name)
-
-      @name     = "#{@variable_name}-#{collection_name}"
-      @reversed = p.id?('reversed')
-
-      while p.look(:id) && p.look(:colon, 1)
-        unless (attribute = p.id?('limit') || p.id?('offset'))
-          raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_attribute")
-        end
-        p.consume
-        set_attribute(attribute, p.expression)
-      end
-      p.consume(:end_of_string)
     end          
 
     private
 
-    def collection_segment(context)
+      class Forloop < Liquid::Drop
-      offsets = context.registers[:for] ||= {}
+        attr_accessor :name, :length
 
-      from = if @from == :continue
+        def initialize(name, idx, length)
-        offsets[@name].to_i
+          @name, @idx, @length = name, idx, length
-      else
+        end
-        from_value = context.evaluate(@from)
+
-        if from_value.nil?
+        def index
-          0
+          @context.registers[:for][@idx] + 1
-        else
+        end
-          Utils.to_integer(from_value)
+
+        def index0
+          @context.registers[:for][@idx]
+        end
+
+        def rindex
+          length - @context.registers[:for][@idx]
+        end
+
+        def rindex0
+          length - @context.registers[:for][@idx] - 1
+        end
+
+        def first
+          (@context.registers[:for][@idx] == 0)
+        end
+
+        def last
+          (@context.registers[:for][@idx] == length - 1)
         end
       end
 
-      collection = context.evaluate(@collection_name)
-      collection = collection.to_a if collection.is_a?(Range)
 
-      limit_value = context.evaluate(@limit)
+      def render_else(context)
-      to = if limit_value.nil?
+        return @else_block ? [render_all(@else_block, context)] : ''
-        nil
-      else
-        Utils.to_integer(limit_value) + from
       end
 
-      segment = Utils.slice_collection(collection, from, to)
+      def iterable?(collection)
-      segment.reverse! if @reversed
+        collection.respond_to?(:each) || Utils.non_blank_string?(collection)
-
-      offsets[@name] = from + segment.length
-
-      segment
-    end
-
-    def render_segment(context, output, segment)
-      for_stack = context.registers[:for_stack] ||= []
-      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'
-          Usage.increment('for_offset_continue')
-          :continue
-        else
-          parse_expression(expr)
-        end
-      when 'limit'
-        @limit = parse_expression(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)

lib/liquid/tags/if.rb

@@ -1,6 +1,5 @@
-# frozen_string_literal: true
-
 module Liquid
+
   # If is the conditional block
   #
   #   {% if user.admin %}
@@ -11,123 +10,69 @@ module Liquid
   #
   #    There are {% if count < 5 %} less {% else %} more {% endif %} items than you need.
   #
+  #
   class If < Block
-    Syntax                  = /(#{QuotedFragment})\s*([=!<>a-z_]+)?\s*(#{QuotedFragment})?/o
+    SyntaxHelp = "Syntax Error in tag 'if' - Valid syntax: if [expression]"
+    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
 
-    attr_reader :blocks
+    def initialize(tag_name, markup, tokens)
-
-    def initialize(tag_name, markup, options)
-      super
       @blocks = []
+
       push_block('if', markup)
-    end
 
-    def nodelist
+      super
-      @blocks.map(&:attachment)
     end
 
-    def parse(tokens)
-      while parse_body(@blocks.last.attachment, tokens)
-      end
-      @blocks.reverse_each do |block|
-        block.attachment.remove_blank_strings if blank?
-        block.attachment.freeze
-      end
-    end
-
-    ELSE_TAG_NAMES = ['elsif', 'else'].freeze
-    private_constant :ELSE_TAG_NAMES
-
     def unknown_tag(tag, markup, tokens)
-      if ELSE_TAG_NAMES.include?(tag)
+      if ['elsif', 'else'].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
+        ''
       end
-
-      output
     end
 
     private
 
-    def push_block(tag, markup)
+      def push_block(tag, markup)
-      block = if tag == 'else'
+        block = if tag == 'else'
-        ElseCondition.new
+          ElseCondition.new
-      else
+        else
-        parse_with_selected_parser(markup)
+
+          expressions = markup.scan(ExpressionsAndOperators).reverse
+          raise(SyntaxError, SyntaxHelp) unless expressions.shift =~ Syntax
+
+          condition = Condition.new($1, $2, $3)
+
+          while not expressions.empty?
+            operator = (expressions.shift).to_s.strip
+
+            raise(SyntaxError, SyntaxHelp) unless expressions.shift.to_s =~ Syntax
+
+            new_condition = Condition.new($1, $2, $3)
+            new_condition.send(operator.to_sym, condition)
+            condition = new_condition
+          end
+
+          condition
+        end
+
+        @blocks.push(block)
+        @nodelist = block.attach(Array.new)
       end
 
-      @blocks.push(block)
-      block.attach(new_body)
-    end
 
-    def parse_expression(markup)
-      Condition.parse_expression(parse_context, markup)
-    end
-
-    def lax_parse(markup)
-      expressions = markup.scan(ExpressionsAndOperators)
-      raise SyntaxError, options[:locale].t("errors.syntax.if") unless expressions.pop =~ Syntax
-
-      condition = Condition.new(parse_expression(Regexp.last_match(1)), Regexp.last_match(2), parse_expression(Regexp.last_match(3)))
-
-      until expressions.empty?
-        operator = expressions.pop.to_s.strip
-
-        raise SyntaxError, options[:locale].t("errors.syntax.if") unless expressions.pop.to_s =~ Syntax
-
-        new_condition = Condition.new(parse_expression(Regexp.last_match(1)), Regexp.last_match(2), parse_expression(Regexp.last_match(3)))
-        raise SyntaxError, options[:locale].t("errors.syntax.if") unless BOOLEAN_OPERATORS.include?(operator)
-        new_condition.send(operator, condition)
-        condition = new_condition
-      end
-
-      condition
-    end
-
-    def strict_parse(markup)
-      p = Parser.new(markup)
-      condition = parse_binary_comparisons(p)
-      p.consume(:end_of_string)
-      condition
-    end
-
-    def parse_binary_comparisons(p)
-      condition = parse_comparison(p)
-      first_condition = condition
-      while (op = (p.id?('and') || p.id?('or')))
-        child_condition = parse_comparison(p)
-        condition.send(op, child_condition)
-        condition = child_condition
-      end
-      first_condition
-    end
-
-    def parse_comparison(p)
-      a = parse_expression(p.expression)
-      if (op = p.consume?(:comparison))
-        b = parse_expression(p.expression)
-        Condition.new(a, op, b)
-      else
-        Condition.new(a)
-      end
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        @node.blocks
-      end
-    end
   end
 
   Template.register_tag('if', If)

lib/liquid/tags/ifchanged.rb

@@ -1,17 +1,18 @@
-# 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
+          ''
+        end              
       end
-
-      output
     end
   end  
   

lib/liquid/tags/include.rb

@@ -1,110 +1,64 @@
-# frozen_string_literal: true
-
 module Liquid
-  # Include allows templates to relate with other templates
-  #
-  # Simply include another template:
-  #
-  #   {% include 'product' %}
-  #
-  # Include a template with a local variable:
-  #
-  #   {% include 'product' with products[0] %}
-  #
-  # Include a template for a collection:
-  #
-  #   {% include 'product' for products %}
-  #
   class Include < Tag
-    prepend Tag::Disableable
+    Syntax = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?/o
   
-    SYNTAX = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o
+    def initialize(tag_name, markup, tokens)      
-    Syntax = SYNTAX
+      if markup =~ Syntax
 
-    attr_reader :template_name_expr, :variable_name_expr, :attributes
+        @template_name = $1        
-
+        @variable_name = $3
-    def initialize(tag_name, markup, options)
+        @attributes    = {}
-      super
-
-      if 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 ? parse_expression(variable_name) : nil
-        @template_name_expr = parse_expression(template_name)
-        @attributes         = {}
 
         markup.scan(TagAttributes) do |key, value|
-          @attributes[key] = parse_expression(value)
+          @attributes[key] = value
         end
 
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.include")
+        raise SyntaxError.new("Error in tag 'include' - Valid syntax: include '[template]' (with|for) [object|collection]")
-      end
-    end
-
-    def parse(_tokens)
-    end
-
-    def render_to_output_buffer(context, output)
-      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
-
-      variable = if @variable_name_expr
-        context.evaluate(@variable_name_expr)
-      else
-        context.find_variable(template_name, raise_on_not_found: false)
       end
 
-      old_template_name = context.template_name
+      super
-      old_partial       = context.partial
+    end
-      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)
+    def parse(tokens)
-            variable.each do |var|
+    end
-              context[context_variable_name] = var
+    
-              partial.render_to_output_buffer(context, output)
+    def render(context)
-            end
+      source = _read_template_from_file_system(context)
-          else
+      partial = Liquid::Template.parse(source)
-            context[context_variable_name] = variable
+      variable = context[@variable_name || @template_name[1..-2]]
-            partial.render_to_output_buffer(context, output)
+      
-          end
+      context.stack do
+        @attributes.each do |key, value|
+          context[key] = context[value]
         end
-      ensure
-        context.template_name = old_template_name
-        context.partial       = old_partial
-      end
 
-      output
+        if variable.is_a?(Array)
-    end
+          variable.collect do |variable|
-
+            context[@template_name[1..-2]] = variable
-    alias_method :parse_context, :options
+            partial.render(context)
-    private :parse_context
+          end
-
+        else
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
+          context[@template_name[1..-2]] = variable
-      def children
+          partial.render(context)
-        [
+        end
-          @node.template_name_expr,
-          @node.variable_name_expr,
-        ] + @node.attributes.values
       end
     end
+   
+    private
+      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)  

lib/liquid/tags/increment.rb

@@ -1,13 +1,12 @@
-# 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
   #     multiple instantiations of the template.
   #     (To achieve the survival, the application must keep the context)
   #
   #     if the variable does not exist, it is created with value 0.
-  #
+
   #   Hello: {% increment variable %}
   #
   # gives you:
@@ -17,18 +16,19 @@ module Liquid
   #    Hello: 2
   #
   class Increment < Tag
-    def initialize(tag_name, markup, options)
+    def initialize(tag_name, markup, tokens)      
-      super
       @variable = markup.strip
+
+      super    
     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
-      output << value.to_s
-      output
     end
+  
+    private
   end
   
   Template.register_tag('increment', Increment)

lib/liquid/tags/inline_comment.rb

@@ -1,25 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class InlineComment < Tag
-    def initialize(tag_name, markup, options)
-      super
-      # Semantically, a comment should only ignore everything after it on the line.
-      # Currently, this implementation doesn't support mixing a comment with another tag
-      # but we need to reserve future support for this.
-      if markup.match?(/\n\s*[^#]/)
-        raise SyntaxError, options[:locale].t("errors.syntax.inline_comment_invalid")
-      end
-    end
-
-    def render_to_output_buffer(_context, output)
-      output
-    end
-
-    def blank?
-      true
-    end
-  end
-
-  Template.register_tag('#', InlineComment)
-end

lib/liquid/tags/raw.rb

@@ -1,50 +1,21 @@
-# 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
-        if token =~ FullTokenPossiblyInvalid && block_delimiter == Regexp.last_match(2)
+
-          @body << Regexp.last_match(1) if Regexp.last_match(1) != ""
+      while token = tokens.shift
-          return
+        if token =~ FullToken
+          if block_delimiter == $1
+            end_tag
+            return
+          end
         end
-        @body << token unless token.empty?
+        @nodelist << token if not token.empty?
-      end
-
-      raise_tag_never_closed(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)
 end
+

lib/liquid/tags/render.rb

@@ -1,84 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Render < Tag
-    FOR = 'for'
-    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)
-      with_or_for = Regexp.last_match(3)
-      variable_name = Regexp.last_match(4)
-
-      @alias_name = Regexp.last_match(6)
-      @variable_name_expr = variable_name ? parse_expression(variable_name) : nil
-      @template_name_expr = parse_expression(template_name)
-      @for = (with_or_for == FOR)
-
-      @attributes = {}
-      markup.scan(TagAttributes) do |key, value|
-        @attributes[key] = parse_expression(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 @for && variable.respond_to?(:each) && variable.respond_to?(:count)
-        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

@@ -1,66 +0,0 @@
-# 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)
-        @collection_name = parse_expression(Regexp.last_match(2))
-        @attributes      = {}
-        markup.scan(TagAttributes) do |key, value|
-          @attributes[key] = parse_expression(value)
-        end
-      else
-        raise SyntaxError, options[:locale].t("errors.syntax.table_row")
-      end
-    end
-
-    def render_to_output_buffer(context, output)
-      (collection = context.evaluate(@collection_name)) || (return '')
-
-      from = @attributes.key?('offset') ? context.evaluate(@attributes['offset']).to_i : 0
-      to   = @attributes.key?('limit')  ? from + context.evaluate(@attributes['limit']).to_i : nil
-
-      collection = Utils.slice_collection(collection, from, to)
-      length     = collection.length
-
-      cols = context.evaluate(@attributes['cols']).to_i
-
-      output << "<tr class=\"row1\">\n"
-      context.stack do
-        tablerowloop = Liquid::TablerowloopDrop.new(length, cols)
-        context['tablerowloop'] = tablerowloop
-
-        collection.each do |item|
-          context[@variable_name] = item
-
-          output << "<td class=\"col#{tablerowloop.col}\">"
-          super
-          output << '</td>'
-
-          if tablerowloop.col_last && !tablerowloop.last
-            output << "</tr>\n<tr class=\"row#{tablerowloop.row + 1}\">"
-          end
-
-          tablerowloop.send(:increment!)
-        end
-      end
-
-      output << "</tr>\n"
-      output
-    end
-
-    class ParseTreeVisitor < Liquid::ParseTreeVisitor
-      def children
-        super + @node.attributes.values + [@node.collection_name]
-      end
-    end
-  end
-
-  Template.register_tag('tablerow', TableRow)
-end

lib/liquid/tags/unless.rb

@@ -1,30 +1,33 @@
-# 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|
+        block = @blocks.first
-        if block.evaluate(context)
+        unless block.evaluate(context)
-          return block.attachment.render_to_output_buffer(context, output)
+          return render_all(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
+        
+        ''
+      end
     end
   end
   
+
   Template.register_tag('unless', 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.
@@ -16,99 +15,47 @@ module Liquid
   #
   class Template
     attr_accessor :root
-    attr_reader :resource_limits, :warnings
+    @@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.
+      def file_system
-      # :lax acts like liquid 2.5 and silently ignores malformed tags in most cases.
+        @@file_system
-      # :warn is the default and will give deprecation warnings when invalid syntax is used.
-      # :strict will enforce correct syntax.
-      attr_accessor :error_mode
-      Template.error_mode = :lax
-
-      attr_accessor :default_exception_renderer
-      Template.default_exception_renderer = lambda do |exception|
-        exception
       end
 
-      attr_accessor :file_system
+      def file_system=(obj)
-      Template.file_system = BlankFileSystem.new
+        @@file_system = obj
-
+      end
-      attr_accessor :tags
-      Template.tags = TagRegistry.new
-      private :tags=
 
       def register_tag(name, klass)
         tags[name.to_s] = klass
       end
 
+      def tags
+        @tags ||= {}
+      end
+
       # Pass a module with filter methods which should be available
       # to all liquid views. Good for registering the standard library
       def register_filter(mod)
-        StrainerFactory.add_global_filter(mod)
+        Strainer.global_filter(mod)
       end
 
-      attr_accessor :default_resource_limits
-      Template.default_resource_limits = {}
-      private :default_resource_limits=
-
       # creates a new <tt>Template</tt> object from liquid source code
-      # To enable profiling, pass in <tt>profile: true</tt> as an option.
+      def parse(source)
-      # See Liquid::Profiler for more information
+        template = Template.new
-      def parse(source, options = {})
+        template.parse(source)
-        new.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 = ResourceLimits.new(Template.default_resource_limits)
     end
 
     # Parse source code.
     # Returns self for easy chaining
-    def parse(source, options = {})
+    def parse(source)
-      parse_context = configure_options(options)
+      @root = Document.new(tokenize(source))
-      tokenizer     = parse_context.new_tokenizer(source, start_line_number: @line_numbers && 1)
-      @root         = Document.parse(tokenizer, parse_context)
       self
     end
 
@@ -133,9 +80,6 @@ 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
@@ -147,89 +91,59 @@ module Liquid
       
       context = case args.first
       when Liquid::Context
-        c = args.shift
+        args.shift
-
-        if @rethrow_errors
-          c.exception_renderer = Liquid::RAISE_EXCEPTION_LAMBDA
-        end
-
-        c
-      when Liquid::Drop
-        drop         = args.shift
-        drop.context = Context.new([drop, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
       when Hash
-        Context.new([args.shift, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
+        Context.new([args.shift, assigns], instance_assigns, registers, @rethrow_errors)
       when nil
-        Context.new(assigns, instance_assigns, registers, @rethrow_errors, @resource_limits)
+        Context.new(assigns, instance_assigns, registers, @rethrow_errors)
       else
-        raise ArgumentError, "Expected Hash or Liquid::Context as parameter"
+        raise ArgumentError, "Expect 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
-
-      # Retrying a render resets resource usage
-      context.resource_limits.reset
-
-      if @profiling && context.profiler.nil?
-        @profiler = context.profiler = Liquid::Profiler.new
       end
 
       begin
         # render the nodelist.
-        @root.render_to_output_buffer(context, output || +'')
+        # for performance reasons we get a array back here. join will make a string out of it
-      rescue Liquid::MemoryError => e
+        @root.render(context).join        
-        context.handle_error(e)
       ensure
         @errors = context.errors
       end
     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 configure_options(options)
+    # Uses the <tt>Liquid::TemplateParser</tt> regexp to tokenize the passed source
-      if (profiling = options[:profile])
+    def tokenize(source)
-        raise "Profiler not loaded, require 'liquid/profiler' first" unless defined?(Liquid::Profiler)
+      source = source.source if source.respond_to?(:source)
-      end
+      return [] if source.to_s.empty?
+      tokens = source.split(TemplateParser)
 
-      @options      = options
+      # removes the rogue empty element at the beginning of the array
-      @profiling    = profiling
+      tokens.shift if tokens[0] and tokens[0].empty?
-      @line_numbers = options[:line_numbers] || @profiling
+
-      parse_context = options.is_a?(ParseContext) ? options : ParseContext.new(options)
+      tokens
-      @warnings     = parse_context.warnings
-      parse_context
     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/template_factory.rb

@@ -1,9 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class TemplateFactory
-    def for(_template_name)
-      Liquid::Template.new
-    end
-  end
-end

lib/liquid/tokenizer.rb

@@ -1,39 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Tokenizer
-    attr_reader :line_number, :for_liquid_tag
-
-    def initialize(source, line_numbers = false, line_number: nil, for_liquid_tag: false)
-      @source         = source
-      @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
-    end
-  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 +1,15 @@
-# 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)
-        collection.load_slice(from, to)
-      else
-        slice_collection_using_each(collection, from, to)
-      end
-    end
-
     def self.slice_collection_using_each(collection, from, to)
       segments = []
-      index    = 0
+      index = 0
+      yielded = 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
@@ -35,51 +24,8 @@ module Liquid
       segments
     end
 
-    def self.to_integer(num)
+    def self.non_blank_string?(collection)
-      return num if num.is_a?(Integer)
+      collection.is_a?(String) && collection != ''
-      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
   #
@@ -12,141 +11,46 @@ module Liquid
   #   {{ user | link }}
   #
   class Variable
-    FilterMarkupRegex        = /#{FilterSeparator}\s*(.*)/om
+    FilterParser = /(?:#{FilterSeparator}|(?:\s*(?:#{QuotedFragment}|#{ArgumentSeparator})\s*)+)/o
-    FilterParser             = /(?:\s+|#{QuotedFragment}|#{ArgumentSeparator})+/o
+    attr_accessor :filters, :name
-    FilterArgsRegex          = /(?:#{FilterArgumentSeparator}|#{ArgumentSeparator})\s*((?:\w+\s*\:\s*)?#{QuotedFragment})/o
-    JustTagAttributes        = /\A#{TagAttributes}\z/o
-    MarkupWithQuotedFragment = /(#{QuotedFragment})(.*)/om
 
-    attr_accessor :filters, :name, :line_number
+    def initialize(markup)
-    attr_reader :parse_context
+      @markup  = markup
-    alias_method :options, :parse_context
+      @name    = nil
-
-    include ParserSwitching
-
-    def initialize(markup, parse_context)
-      @markup        = markup
-      @name          = nil
-      @parse_context = parse_context
-      @line_number   = parse_context.line_number
-
-      strict_parse_with_error_mode_fallback(markup)
-    end
-
-    def raw
-      @markup
-    end
-
-    def markup_context(markup)
-      "in \"{{#{markup}}}\""
-    end
-
-    def lax_parse(markup)
       @filters = []
-      return unless markup =~ MarkupWithQuotedFragment
+      if match = markup.match(/\s*(#{QuotedFragment})(.*)/o)
-
+        @name = match[1]
-      name_markup   = Regexp.last_match(1)
+        if match[2].match(/#{FilterSeparator}\s*(.*)/o)
-      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+)(?:\s*#{FilterArgumentSeparator}(.*))?/)
-        filters = Regexp.last_match(1).scan(FilterParser)
+              filtername = matches[1]
-        filters.each do |f|
+              filterargs = matches[2].to_s.scan(/(?:\A|#{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)
-      @filters = []
-      p = Parser.new(markup)
-
-      return if p.look(:end_of_string)
-
-      @name = Expression.parse(p.expression)
-      while p.consume?(:pipe)
-        filtername = p.consume(:id)
-        filterargs = p.consume?(:colon) ? parse_filterargs(p) : []
-        @filters << parse_filter_expressions(filtername, filterargs)
-      end
-      p.consume(:end_of_string)
-    end
-
-    def parse_filterargs(p)
-      # first argument
-      filterargs = [p.argument]
-      # followed by comma separated others
-      filterargs << p.argument while p.consume?(:comma)
-      filterargs
-    end
-
     def render(context)
-      obj = context.evaluate(@name)
+      return '' if @name.nil?
-
+      @filters.inject(context[@name]) do |output, filter|
-      @filters.each do |filter_name, filter_args, filter_kwargs|
+        filterargs = []
-        filter_args = evaluate_filter_expressions(context, filter_args, filter_kwargs)
+        keyword_args = {}
-        obj = context.invoke(filter_name, obj, *filter_args)
+        filter[1].to_a.each do |a|
-      end
+          if matches = a.match(/\A#{TagAttributes}\z/o)
-
+            keyword_args[matches[1]] = context[matches[2]]
-      context.apply_global_filter(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
-
-    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 +0,0 @@
-# encoding: utf-8
-# frozen_string_literal: true
-
-module Liquid
-  VERSION = "5.0.0"
-end

liquid.gemspec

@@ -1,34 +1,24 @@
 # encoding: utf-8
-# frozen_string_literal: true
-
-lib = File.expand_path('../lib/', __FILE__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-
-require "liquid/version"
 
 Gem::Specification.new do |s|
   s.name        = "liquid"
-  s.version     = Liquid::VERSION
+  s.version     = "2.5.0"
   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     = ">= 2.5.0"
   s.required_rubygems_version = ">= 1.3.7"
 
-  s.metadata['allowed_push_host'] = 'https://rubygems.org'
-
   s.test_files  = Dir.glob("{test}/**/*")
-  s.files       = Dir.glob("{lib}/**/*") + %w(LICENSE README.md)
+  s.files       = Dir.glob("{lib}/**/*") +
+                  Dir.glob("{ext}/**/*") + %w(MIT-LICENSE README.md)
 
-  s.extra_rdoc_files = ["History.md", "README.md"]
+  s.extensions = ['ext/liquid/extconf.rb']
 
-  s.require_path = "lib"
+  s.extra_rdoc_files  = ["History.md", "README.md"]
 
-  s.add_development_dependency('rake', '~> 13.0')
+  s.require_paths = ["lib", "ext"]
-  s.add_development_dependency('minitest')
 end

performance/benchmark.rb

@@ -1,20 +1,11 @@
-# frozen_string_literal: true
+require 'rubygems'
+require 'benchmark'
+require File.dirname(__FILE__) + '/theme_runner'
 
-require 'benchmark/ips'
-require_relative 'theme_runner'
-
-Liquid::Template.error_mode = ARGV.first.to_sym if ARGV.first
 profiler = ThemeRunner.new
 
-Benchmark.ips do |x|
+Benchmark.bm 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 +1,17 @@
-# frozen_string_literal: true
+require 'rubygems'
+require 'ruby-prof' rescue fail("install ruby-prof 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
 
-[:cpu, :object].each do |profile_type|
+puts 'Running profiler...'
-  puts "Profiling in #{profile_type} mode..."
-  results = StackProf.run(mode: profile_type) do
-    200.times do
-      profiler.run
-    end
-  end
 
-  if profile_type == :cpu && (graph_filename = ENV['GRAPH_FILENAME'])
+results  = profiler.run_profile
-    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)
+puts 'Success'
-  File.write(ENV['FILENAME'] + "." + profile_type.to_s, Marshal.dump(results)) if ENV['FILENAME']
+
+filename = (ENV['TMP'] || '/tmp') + "/callgrind.liquid.txt"
+File.open(filename, "w+") do |fp| 
+  RubyProf::CallTreePrinter.new(results).print(fp, :print_file => true) 
 end
+$stderr.puts "wrote RubyProf::CallTreePrinter output to #{filename}"

performance/shopify/comment_form.rb

@@ -1,20 +1,18 @@
-# frozen_string_literal: true
-
 class CommentForm < Liquid::Block                                             
   Syntax = /(#{Liquid::VariableSignature}+)/   
 
-  def initialize(tag_name, markup, options)
+  def initialize(tag_name, markup, tokens)
-    super
-
     if markup =~ Syntax
-      @variable_name = Regexp.last_match(1)
+      @variable_name = $1
-      @attributes    = {}
+      @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
+    
+    super
   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 +1,13 @@
-# 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)
+  def initialize(tag_name, markup, tokens)
-    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 +17,50 @@ 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
+  
+    super
   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
@@ -39,47 +38,51 @@ 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
   end
   
   def url_for_vendor(vendor_title)
-    "/collections/#{to_handle(vendor_title)}"
+    "/collections/#{vendor_title.to_handle}"
   end
   
   def url_for_type(type_title)
-    "/collections/#{to_handle(type_title)}"
+    "/collections/#{type_title.to_handle}"
   end
   
   def product_img_url(url, style = 'small')
-    unless url =~ %r{\Aproducts/([\w\-\_]+)\.(\w{2,4})}
+    
+    unless url =~ /^products\/([\w\-\_]+)\.(\w{2,4})/
       raise ArgumentError, 'filter "size" can only be called on product images'
     end
     
     case style
     when 'original'
-      '/files/shops/random_number/' + url
+      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']
@@ -92,15 +95,4 @@ module ShopFilter
     input == 1 ? singular : plural
   end
       
-  private
-
-  def to_handle(str)
-    result = str.dup
-    result.downcase!
-    result.delete!("'\"()[]")
-    result.gsub!(/\W+/, '-')
-    result.gsub!(/-+\z/, '') if result[-1] == '-'
-    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