Reserve future support for comment line before a tag name

handle carriage return in newlines_to_br

.github/workflows/liquid.yml

@@ -0,0 +1,39 @@
+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

.rubocop-https---shopify-github-io-ruby-style-guide-rubocop-yml

@@ -20,7 +20,7 @@ Style/Alias:
   - prefer_alias
   - prefer_alias_method
 
-Layout/AlignHash:
+Layout/HashAlignment:
   EnforcedHashRocketStyle: key
   EnforcedColonStyle: key
   EnforcedLastArgumentHashStyle: ignore_implicit
@@ -30,7 +30,7 @@ Layout/AlignHash:
   - ignore_implicit
   - ignore_explicit
 
-Layout/AlignParameters:
+Layout/ParameterAlignment:
   EnforcedStyle: with_fixed_indentation
   SupportedStyles:
   - with_first_parameter
@@ -76,13 +76,6 @@ Style/BlockDelimiters:
   - proc
   - it
 
-Style/BracesAroundHashParameters:
-  EnforcedStyle: no_braces
-  SupportedStyles:
-  - braces
-  - no_braces
-  - context_dependent
-
 Layout/CaseIndentation:
   EnforcedStyle: end
   SupportedStyles:
@@ -172,7 +165,7 @@ Naming/FileName:
   Regex:
   IgnoreExecutableScripts: true
 
-Layout/IndentFirstArgument:
+Layout/FirstArgumentIndentation:
   EnforcedStyle: consistent
   SupportedStyles:
   - consistent
@@ -202,6 +195,7 @@ Style/FrozenStringLiteralComment:
   SupportedStyles:
     - always
     - never
+  SafeAutoCorrect: true
 
 Style/GlobalVars:
   AllowedVariables: []
@@ -225,7 +219,7 @@ Layout/IndentationConsistency:
 Layout/IndentationWidth:
   Width: 2
 
-Layout/IndentFirstArrayElement:
+Layout/FirstArrayElementIndentation:
   EnforcedStyle: consistent
   SupportedStyles:
   - special_inside_parentheses
@@ -233,10 +227,10 @@ Layout/IndentFirstArrayElement:
   - align_brackets
   IndentationWidth:
 
-Layout/IndentAssignment:
+Layout/AssignmentIndentation:
   IndentationWidth:
 
-Layout/IndentFirstHashElement:
+Layout/FirstHashElementIndentation:
   EnforcedStyle: consistent
   SupportedStyles:
   - special_inside_parentheses
@@ -271,7 +265,7 @@ Style/MethodCallWithArgsParentheses:
   - raise
   - puts
   Exclude:
-  - Gemfile
+  - '**/Gemfile'
 
 Style/MethodDefParentheses:
   EnforcedStyle: require_parentheses
@@ -340,9 +334,9 @@ Style/PercentQLiterals:
 Naming/PredicateName:
   NamePrefix:
   - is_
-  NamePrefixBlacklist:
+  ForbiddenPrefixes:
   - is_
-  NameWhitelist:
+  AllowedMethods:
   - is_a?
   Exclude:
   - 'spec/**/*'
@@ -467,7 +461,7 @@ Style/TernaryParentheses:
   - require_no_parentheses
   AllowSafeAssignment: true
 
-Layout/TrailingBlankLines:
+Layout/TrailingEmptyLines:
   EnforcedStyle: final_newline
   SupportedStyles:
   - final_newline
@@ -478,7 +472,7 @@ Style/TrivialAccessors:
   AllowPredicates: true
   AllowDSLWriters: false
   IgnoreClassMethods: false
-  Whitelist:
+  AllowedMethods:
   - to_ary
   - to_a
   - to_c
@@ -509,7 +503,7 @@ Style/WhileUntilModifier:
 Metrics/BlockNesting:
   Max: 3
 
-Metrics/LineLength:
+Layout/LineLength:
   Max: 120
   AllowHeredoc: true
   AllowURI: true
@@ -561,7 +555,7 @@ Lint/UnusedMethodArgument:
 Naming/AccessorMethodName:
   Enabled: true
 
-Layout/AlignArray:
+Layout/ArrayAlignment:
   Enabled: true
 
 Style/ArrayJoin:
@@ -584,6 +578,7 @@ Layout/BlockEndNewline:
 
 Style/CaseEquality:
   Enabled: true
+  AllowOnConstant: true
 
 Style/CharacterLiteral:
   Enabled: true
@@ -666,6 +661,9 @@ Style/IfWithSemicolon:
 Style/IdenticalConditionalBranches:
   Enabled: true
 
+Layout/IndentationStyle:
+  Enabled: true
+
 Style/InfiniteLoop:
   Enabled: true
 
@@ -678,7 +676,7 @@ Style/LineEndConcatenation:
 Style/MethodCallWithoutArgsParentheses:
   Enabled: true
 
-Style/MethodMissingSuper:
+Lint/MissingSuper:
   Enabled: true
 
 Style/MissingRespondToMissing:
@@ -810,22 +808,19 @@ Layout/SpaceInsideRangeLiteral:
 Style/SymbolLiteral:
   Enabled: true
 
-Layout/Tab:
-  Enabled: true
-
 Layout/TrailingWhitespace:
   Enabled: true
 
 Style/UnlessElse:
   Enabled: true
 
-Style/UnneededCapitalW:
+Style/RedundantCapitalW:
   Enabled: true
 
-Style/UnneededInterpolation:
+Style/RedundantInterpolation:
   Enabled: true
 
-Style/UnneededPercentQ:
+Style/RedundantPercentQ:
   Enabled: true
 
 Style/VariableInterpolation:
@@ -840,8 +835,8 @@ Style/WhileUntilDo:
 Style/ZeroLengthPredicate:
   Enabled: true
 
-Layout/IndentHeredoc:
-  EnforcedStyle: squiggly
+Layout/HeredocIndentation:
+  Enabled: true
 
 Lint/AmbiguousOperator:
   Enabled: true
@@ -864,7 +859,7 @@ Lint/DeprecatedClassMethods:
 Lint/DuplicateMethods:
   Enabled: true
 
-Lint/DuplicatedKey:
+Lint/DuplicateHashKey:
   Enabled: true
 
 Lint/EachWithObjectArgument:
@@ -879,9 +874,6 @@ Lint/EmptyEnsure:
 Lint/EmptyInterpolation:
   Enabled: true
 
-Lint/EndInMethod:
-  Enabled: true
-
 Lint/EnsureReturn:
   Enabled: true
 
@@ -891,7 +883,7 @@ Lint/FloatOutOfRange:
 Lint/FormatParameterMismatch:
   Enabled: true
 
-Lint/HandleExceptions:
+Lint/SuppressedException:
   AllowComments: true
 
 Lint/ImplicitStringConcatenation:
@@ -947,7 +939,7 @@ Lint/ShadowedException:
 Lint/ShadowingOuterLocalVariable:
   Enabled: true
 
-Lint/StringConversionInInterpolation:
+Lint/RedundantStringCoercion:
   Enabled: true
 
 Lint/UnderscorePrefixedVariableName:
@@ -956,13 +948,13 @@ Lint/UnderscorePrefixedVariableName:
 Lint/UnifiedInteger:
   Enabled: true
 
-Lint/UnneededCopDisableDirective:
+Lint/RedundantCopDisableDirective:
   Enabled: true
 
-Lint/UnneededCopEnableDirective:
+Lint/RedundantCopEnableDirective:
   Enabled: true
 
-Lint/UnneededSplatExpansion:
+Lint/RedundantSplatExpansion:
   Enabled: true
 
 Lint/UnreachableCode:
@@ -974,7 +966,7 @@ Lint/UselessAccessModifier:
 Lint/UselessAssignment:
   Enabled: true
 
-Lint/UselessComparison:
+Lint/BinaryOperatorWithIdenticalOperands:
   Enabled: true
 
 Lint/UselessElseWithoutRescue:
@@ -1025,3 +1017,6 @@ Style/ModuleFunction:
 
 Lint/OrderedMagicComments:
   Enabled: true
+
+Lint/DeprecatedOpenSSLConstant:
+  Enabled: true

.rubocop.yml

@@ -9,6 +9,7 @@ Performance:
 
 AllCops:
   TargetRubyVersion: 2.4
+  NewCops: disable
   Exclude:
     - 'vendor/bundle/**/*'
 

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2019-09-11 06:34:25 +1000 using RuboCop version 0.74.0.
+# 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
@@ -14,14 +14,26 @@ Lint/InheritException:
   Exclude:
     - 'lib/liquid/interrupts.rb'
 
-# Offense count: 98
+# Offense count: 113
 # Cop supports --auto-correct.
 # Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
-Metrics/LineLength:
-  Max: 294
+Layout/LineLength:
+  Max: 260
 
-# Offense count: 44
+# 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'
@@ -32,7 +44,6 @@ Naming/ConstantName:
     - 'lib/liquid/tags/cycle.rb'
     - 'lib/liquid/tags/for.rb'
     - 'lib/liquid/tags/if.rb'
-    - 'lib/liquid/tags/include.rb'
     - 'lib/liquid/tags/raw.rb'
     - 'lib/liquid/tags/table_row.rb'
     - 'lib/liquid/variable.rb'
@@ -40,9 +51,7 @@ Naming/ConstantName:
     - 'performance/shopify/paginate.rb'
     - 'test/integration/tags/include_tag_test.rb'
 
-# Offense count: 5
+# Offense count: 2
 Style/ClassVars:
   Exclude:
     - 'lib/liquid/condition.rb'
-    - 'lib/liquid/strainer.rb'
-    - 'lib/liquid/template.rb'

.travis.yml

@@ -1,33 +0,0 @@
-language: ruby
-cache: bundler
-os: [osx, linux]
-
-rvm:
-  - 2.4
-  - 2.5
-  - &latest_ruby 2.6
-  - 2.7
-  - 2.7.0-preview1
-  - 2.7.0-preview2
-  - 2.7.0-preview3
-  - ruby-head
-
-matrix:
-  include:
-    - rvm: *latest_ruby
-      script: bundle exec rake memory_profile:run
-      name: Profiling Memory Usage
-  allow_failures:
-    - rvm: ruby-head
-    - rvm: 2.7
-    - rvm: 2.7.0-preview2
-    - rvm: 2.7.0-preview3
-
-branches:
-  only:
-    - master
-    - gh-pages
-    - /.*-stable/
-
-notifications:
-  disable: true

Gemfile

@@ -18,10 +18,10 @@ group :benchmark, :test do
 end
 
 group :test do
-  gem 'rubocop', '~> 0.74.0', require: false
+  gem 'rubocop', '~> 1.4', require: false
   gem 'rubocop-performance', require: false
 
   platform :mri, :truffleruby do
-    gem 'liquid-c', github: 'Shopify/liquid-c', ref: 'master'
+    gem 'liquid-c', github: 'Shopify/liquid-c', ref: 'inline-comment'
   end
 end

History.md

@@ -1,5 +1,43 @@
 # Liquid Change Log
 
+## 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

Rakefile

@@ -9,11 +9,17 @@ task(default: [:test, :rubocop])
 
 desc('run test suite with default parser')
 Rake::TestTask.new(:base_test) do |t|
-  t.libs << '.' << 'lib' << 'test'
+  t.libs << 'lib' << 'test'
   t.test_files = FileList['test/{integration,unit}/**/*_test.rb']
   t.verbose    = false
 end
 
+Rake::TestTask.new(:integration_test) do |t|
+  t.libs << 'lib' << 'test'
+  t.test_files = FileList['test/integration/**/*_test.rb']
+  t.verbose    = false
+end
+
 desc('run test suite with warn error mode')
 task :warn_test do
   ENV['LIQUID_PARSER_MODE'] = 'warn'
@@ -40,12 +46,12 @@ task :test do
     ENV['LIQUID_C'] = '1'
 
     ENV['LIQUID_PARSER_MODE'] = 'lax'
-    Rake::Task['base_test'].reenable
-    Rake::Task['base_test'].invoke
+    Rake::Task['integration_test'].reenable
+    Rake::Task['integration_test'].invoke
 
     ENV['LIQUID_PARSER_MODE'] = 'strict'
-    Rake::Task['base_test'].reenable
-    Rake::Task['base_test'].invoke
+    Rake::Task['integration_test'].reenable
+    Rake::Task['integration_test'].invoke
   end
 end
 

lib/liquid.rb

@@ -42,6 +42,8 @@ module Liquid
   TemplateParser              = /(#{PartialTemplateParser}|#{AnyStartingTag})/om
   VariableParser              = /\[[^\]]+\]|#{VariableSegment}+\??/o
 
+  RAISE_EXCEPTION_LAMBDA = ->(_e) { raise }
+
   singleton_class.send(:attr_accessor, :cache_classes)
   self.cache_classes = true
 end
@@ -57,11 +59,14 @@ require 'liquid/forloop_drop'
 require 'liquid/extensions'
 require 'liquid/errors'
 require 'liquid/interrupts'
-require 'liquid/strainer'
+require 'liquid/strainer_factory'
+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'
@@ -80,8 +85,8 @@ 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["#{__dir__}/liquid/registers/*.rb"].each { |f| require f }

lib/liquid/block.rb

@@ -10,9 +10,10 @@ module Liquid
     end
 
     def parse(tokens)
-      @body = BlockBody.new
+      @body = new_body
       while parse_body(@body, tokens)
       end
+      @body.freeze
     end
 
     # For backwards compatibility
@@ -28,7 +29,12 @@ module Liquid
       @body.nodelist
     end
 
-    def unknown_tag(tag, _params, _tokens)
+    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)
@@ -42,6 +48,10 @@ module Liquid
       end
     end
 
+    def raise_tag_never_closed(block_name)
+      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
+    end
+
     def block_name
       @tag_name
     end
@@ -50,8 +60,14 @@ module Liquid
       @block_delimiter ||= "end#{block_name}"
     end
 
-    protected
+    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"
@@ -62,9 +78,7 @@ module Liquid
           @blank &&= body.blank?
 
           return false if end_tag_name == block_delimiter
-          unless end_tag_name
-            raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
-          end
+          raise_tag_never_closed(block_name) unless end_tag_name
 
           # this tag is not registered with the system
           # pass it to the current block for special handling or error reporting

lib/liquid/block_body.rb

@@ -1,9 +1,11 @@
 # 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
+    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            = "{%"
@@ -17,6 +19,8 @@ module Liquid
     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
@@ -26,6 +30,11 @@ module Liquid
       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
@@ -51,14 +60,63 @@ module Liquid
       yield nil, nil
     end
 
-    private def parse_for_document(tokenizer, parse_context, &block)
+    # @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
-            raise_missing_tag_terminator(token, parse_context)
+            BlockBody.raise_missing_tag_terminator(token, parse_context)
           end
           tag_name = Regexp.last_match(2)
           markup   = Regexp.last_match(4)
@@ -70,8 +128,8 @@ module Liquid
           end
 
           if tag_name == 'liquid'
-            liquid_tag_tokenizer = Tokenizer.new(markup, line_number: parse_context.line_number, for_liquid_tag: true)
-            next parse_for_liquid_tag(liquid_tag_tokenizer, parse_context, &block)
+            parse_liquid_tag(markup, parse_context)
+            next
           end
 
           unless (tag = registered_tags[tag_name])
@@ -104,7 +162,11 @@ module Liquid
       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)
@@ -114,38 +176,49 @@ module Liquid
       @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)
-      context.resource_limits.render_score += @nodelist.length
+      freeze unless frozen?
+
+      context.resource_limits.increment_render_score(@nodelist.length)
 
       idx = 0
       while (node = @nodelist[idx])
-        previous_output_size = output.bytesize
-
-        case node
-        when String
+        if node.instance_of?(String)
           output << node
-        when Variable
+        else
           render_node(context, output, node)
-        when Block
-          render_node(context, node.blank? ? +'' : output, node)
-          break if context.interrupt? # might have happened in a for-block
-        when Continue, Break
           # If we get an Interrupt that means the block must stop processing. An
           # Interrupt is any command that stops block execution such as {% break %}
-          # or {% continue %}
-          context.push_interrupt(node.interrupt)
-          break
-        else # Other non-Block tags
-          render_node(context, output, node)
-          break if context.interrupt? # might have happened through an include
+          # 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
 
-        raise_if_resource_limits_reached(context, output.bytesize - previous_output_size)
+        context.resource_limits.increment_write_score(output)
       end
 
       output
@@ -154,29 +227,7 @@ module Liquid
     private
 
     def render_node(context, output, node)
-      if node.disabled?(context)
-        output << node.disabled_error_message
-        return
-      end
-      disable_tags(context, node.disabled_tags) do
-        node.render_to_output_buffer(context, output)
-      end
-    rescue UndefinedVariable, UndefinedDropMethod, UndefinedFilter => e
-      context.handle_error(e, node.line_number)
-    rescue ::StandardError => e
-      line_number = node.is_a?(String) ? nil : node.line_number
-      output << context.handle_error(e, line_number)
-    end
-
-    def disable_tags(context, tags, &block)
-      return yield if tags.empty?
-      context.registers[:disabled_tags].disable(tags, &block)
-    end
-
-    def raise_if_resource_limits_reached(context, length)
-      context.resource_limits.render_length += length
-      return unless context.resource_limits.reached?
-      raise MemoryError, "Memory limits exceeded"
+      BlockBody.render_node(context, output, node)
     end
 
     def create_variable(token, parse_context)
@@ -184,15 +235,17 @@ module Liquid
         markup = content.first
         return Variable.new(markup, parse_context)
       end
-      raise_missing_variable_terminator(token, parse_context)
+      BlockBody.raise_missing_variable_terminator(token, parse_context)
     end
 
+    # @deprecated Use {.raise_missing_tag_terminator} instead
     def raise_missing_tag_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination", token: token, tag_end: TagEnd.inspect)
+      BlockBody.raise_missing_tag_terminator(token, parse_context)
     end
 
+    # @deprecated Use {.raise_missing_variable_terminator} instead
     def raise_missing_variable_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination", token: token, tag_end: VariableEnd.inspect)
+      BlockBody.raise_missing_variable_terminator(token, parse_context)
     end
 
     def registered_tags

lib/liquid/condition.rb

@@ -27,10 +27,28 @@ module Liquid
       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)
+      @@method_literals[markup] || parse_context.parse_expression(markup)
+    end
+
     attr_reader :attachment, :child_condition
     attr_accessor :left, :operator, :right
 
@@ -91,7 +109,7 @@ module Liquid
     private
 
     def equal_variables(left, right)
-      if left.is_a?(Liquid::Expression::MethodLiteral)
+      if left.is_a?(MethodLiteral)
         if right.respond_to?(left.method_name)
           return right.send(left.method_name)
         else
@@ -99,7 +117,7 @@ module Liquid
         end
       end
 
-      if right.is_a?(Liquid::Expression::MethodLiteral)
+      if right.is_a?(MethodLiteral)
         if left.respond_to?(right.method_name)
           return left.send(right.method_name)
         else

lib/liquid/context.rb

@@ -18,8 +18,8 @@ module Liquid
     attr_accessor :exception_renderer, :template_name, :partial, :global_filter, :strict_variables, :strict_filters
 
     # rubocop:disable Metrics/ParameterLists
-    def self.build(environments: {}, outer_scope: {}, registers: {}, rethrow_errors: false, resource_limits: nil, static_environments: {})
-      new(environments, outer_scope, registers, rethrow_errors, resource_limits, static_environments)
+    def self.build(environments: {}, outer_scope: {}, registers: {}, rethrow_errors: false, resource_limits: nil, static_environments: {}, &block)
+      new(environments, outer_scope, registers, rethrow_errors, resource_limits, static_environments, &block)
     end
 
     def initialize(environments = {}, outer_scope = {}, registers = {}, rethrow_errors = false, resource_limits = nil, static_environments = {})
@@ -34,16 +34,20 @@ module Liquid
       @strict_variables    = false
       @resource_limits     = resource_limits || ResourceLimits.new(Template.default_resource_limits)
       @base_scope_depth    = 0
-      squash_instance_assigns_with_environments
+      @interrupts          = []
+      @filters             = []
+      @global_filter       = nil
+      @disabled_tags       = {}
 
       self.exception_renderer = Template.default_exception_renderer
       if rethrow_errors
-        self.exception_renderer = ->(_e) { raise }
+        self.exception_renderer = Liquid::RAISE_EXCEPTION_LAMBDA
       end
 
-      @interrupts    = []
-      @filters       = []
-      @global_filter = nil
+      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
 
@@ -52,7 +56,7 @@ module Liquid
     end
 
     def strainer
-      @strainer ||= Strainer.create(self, @filters)
+      @strainer ||= StrainerFactory.create(self, @filters)
     end
 
     # Adds filters to this context.
@@ -133,7 +137,7 @@ module Liquid
     def new_isolated_subcontext
       check_overflow
 
-      Context.build(
+      self.class.build(
         resource_limits: resource_limits,
         static_environments: static_environments,
         registers: StaticRegisters.new(registers)
@@ -144,6 +148,7 @@ module Liquid
         subcontext.strainer = nil
         subcontext.errors   = errors
         subcontext.warnings = warnings
+        subcontext.disabled_tags = @disabled_tags
       end
     end
 
@@ -208,9 +213,24 @@ module Liquid
       end
     end
 
+    def with_disabled_tags(tag_names)
+      tag_names.each do |name|
+        @disabled_tags[name] = @disabled_tags.fetch(name, 0) + 1
+      end
+      yield
+    ensure
+      tag_names.each do |name|
+        @disabled_tags[name] -= 1
+      end
+    end
+
+    def tag_disabled?(tag_name)
+      @disabled_tags.fetch(tag_name, 0) > 0
+    end
+
     protected
 
-    attr_writer :base_scope_depth, :warnings, :errors, :strainer, :filters
+    attr_writer :base_scope_depth, :warnings, :errors, :strainer, :filters, :disabled_tags
 
     private
 

lib/liquid/document.rb

@@ -1,23 +1,34 @@
 # frozen_string_literal: true
 
 module Liquid
-  class Document < BlockBody
+  class Document
     def self.parse(tokens, parse_context)
-      doc = new
+      doc = new(parse_context)
       doc.parse(tokens, parse_context)
       doc
     end
 
-    def parse(tokens, parse_context)
-      super do |end_tag_name, _end_tag_params|
-        unknown_tag(end_tag_name, parse_context) if end_tag_name
+    attr_reader :parse_context, :body
+
+    def initialize(parse_context)
+      @parse_context = parse_context
+      @body = new_body
+    end
+
+    def nodelist
+      @body.nodelist
+    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, parse_context)
+    def unknown_tag(tag, _markup, _tokenizer)
       case tag
       when 'else', 'end'
         raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_outer_tag", tag: tag)
@@ -25,5 +36,30 @@ module Liquid
         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/errors.rb

@@ -46,7 +46,6 @@ module Liquid
   StandardError       = Class.new(Error)
   SyntaxError         = Class.new(Error)
   StackLevelError     = Class.new(Error)
-  TaintedError        = Class.new(Error)
   MemoryError         = Class.new(Error)
   ZeroDivisionError   = Class.new(Error)
   FloatDomainError    = Class.new(Error)
@@ -54,5 +53,6 @@ module Liquid
   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

@@ -2,46 +2,39 @@
 
 module Liquid
   class Expression
-    class MethodLiteral
-      attr_reader :method_name, :to_s
-
-      def initialize(method_name, to_s)
-        @method_name = method_name
-        @to_s = to_s
-      end
-
-      def to_liquid
-        to_s
-      end
-    end
-
     LITERALS = {
       nil => nil, 'nil' => nil, 'null' => nil, '' => nil,
       'true' => true,
       'false' => false,
-      'blank' => MethodLiteral.new(:blank?, '').freeze,
-      'empty' => MethodLiteral.new(:empty?, '').freeze
+      'blank' => '',
+      'empty' => ''
     }.freeze
 
-    SINGLE_QUOTED_STRING = /\A'(.*)'\z/m
-    DOUBLE_QUOTED_STRING = /\A"(.*)"\z/m
-    INTEGERS_REGEX       = /\A(-?\d+)\z/
-    FLOATS_REGEX         = /\A(-?\d[\d\.]+)\z/
-    RANGES_REGEX         = /\A\((\S+)\.\.(\S+)\)\z/
+    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)
-      if LITERALS.key?(markup)
-        LITERALS[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
-        case markup
-        when SINGLE_QUOTED_STRING, DOUBLE_QUOTED_STRING
-          Regexp.last_match(1)
-        when INTEGERS_REGEX
-          Regexp.last_match(1).to_i
-        when RANGES_REGEX
-          RangeLookup.parse(Regexp.last_match(1), Regexp.last_match(2))
-        when FLOATS_REGEX
-          Regexp.last_match(1).to_f
+        markup = markup.strip
+        if LITERALS.key?(markup)
+          LITERALS[markup]
         else
           VariableLookup.parse(markup)
         end

lib/liquid/forloop_drop.rb

@@ -9,7 +9,12 @@ module Liquid
       @index      = 0
     end
 
-    attr_reader :name, :length, :parentloop
+    attr_reader :length, :parentloop
+
+    def name
+      Usage.increment('forloop_drop_name')
+      @name
+    end
 
     def index
       @index + 1

lib/liquid/locales/en.yml

@@ -20,9 +20,9 @@
       tag_termination: "Tag '%{token}' was not properly terminated with regexp: %{tag_end}"
       variable_termination: "Variable '%{token}' was not properly terminated with regexp: %{tag_end}"
       tag_never_closed: "'%{block_name}' tag was never closed"
-      meta_syntax_error: "Liquid syntax error: #{e.message}"
       table_row: "Syntax Error in 'table_row loop' - Valid syntax: table_row [item] in [collection] cols=3"
       render: "Syntax error in tag 'render' - Template name must be a quoted string"
+      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:

lib/liquid/parse_context.rb

@@ -19,6 +19,18 @@ module Liquid
       @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

lib/liquid/parser.rb

@@ -46,16 +46,20 @@ module Liquid
       tok[0] == type
     end
 
-    SINGLE_TOKEN_EXPRESSION_TYPES = [:string, :number].freeze
-    private_constant :SINGLE_TOKEN_EXPRESSION_TYPES
-
     def expression
       token = @tokens[@p]
-      if token[0] == :id
-        variable_signature
-      elsif SINGLE_TOKEN_EXPRESSION_TYPES.include?(token[0])
+      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
-      elsif token.first == :open_round
+      when :open_round
         consume
         first = expression
         consume(:dotdot)
@@ -78,16 +82,19 @@ module Liquid
       str
     end
 
-    def variable_signature
-      str = consume(:id)
-      while look(:open_square)
-        str << consume
-        str << expression
-        str << consume(:close_square)
-      end
-      if look(:dot)
-        str << consume
-        str << variable_signature
+    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

lib/liquid/parser_switching.rb

@@ -2,16 +2,28 @@
 
 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
-          return strict_parse_with_error_context(markup)
+          strict_parse_with_error_context(markup)
         rescue SyntaxError => e
           parse_context.warnings << e
-          return lax_parse(markup)
+          lax_parse(markup)
         end
       end
     end

lib/liquid/partial_cache.rb

@@ -12,7 +12,10 @@ module Liquid
 
       parse_context.partial = true
 
-      partial = Liquid::Template.parse(source, parse_context)
+      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

lib/liquid/profiler.rb

@@ -25,7 +25,7 @@ module Liquid
   #     node.code
   #
   #     # Which template and line number of this node.
-  #     # If top level, this will be "<root>".
+  #     # The top-level template name is `nil` by default, but can be set in the Liquid::Context before rendering.
   #     node.partial
   #     node.line_number
   #
@@ -46,126 +46,94 @@ module Liquid
     include Enumerable
 
     class Timing
-      attr_reader :code, :partial, :line_number, :children, :total_time, :self_time
+      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(node, partial)
-        @code        = node.respond_to?(:raw) ? node.raw : node
-        @partial     = partial
-        @line_number = node.respond_to?(:line_number) ? node.line_number : nil
-        @children    = []
+      def initialize(code: nil, template_name: nil, line_number: nil)
+        @code = code
+        @template_name = template_name
+        @line_number = line_number
+        @children = []
       end
 
-      def self.start(node, partial)
-        new(node, partial).tap(&:start)
-      end
-
-      def start
-        @start_time = Time.now
-      end
-
-      def finish
-        @end_time   = Time.now
-        @total_time = @end_time - @start_time
-
-        if @children.empty?
-          @self_time = @total_time
-        else
-          total_children_time = 0
+      def self_time
+        @self_time ||= begin
+          total_children_time = 0.0
           @children.each do |child|
             total_children_time += child.total_time
           end
-          @self_time = @total_time - total_children_time
+          @total_time - total_children_time
         end
       end
+    end
 
-      def render_time
-        @end_time - @start_time
+    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 self.profile_node_render(node)
-      if Profiler.current_profile && node.respond_to?(:render)
-        Profiler.current_profile.start_node(node)
-        output = yield
-        Profiler.current_profile.end_node(node)
-        output
+    def children
+      children = @root_children
+      if children.length == 1
+        children.first.children
       else
-        yield
+        children
       end
     end
 
-    def self.profile_children(template_name)
-      if Profiler.current_profile
-        Profiler.current_profile.push_partial(template_name)
-        output = yield
-        Profiler.current_profile.pop_partial
-        output
-      else
-        yield
-      end
-    end
-
-    def self.current_profile
-      Thread.current[:liquid_profiler]
-    end
-
-    def initialize(partial_name = "<root>")
-      @partial_stack = [partial_name]
-
-      @root_timing  = Timing.new("", current_partial)
-      @timing_stack = [@root_timing]
-
-      @render_start_at = Time.now
-      @render_end_at   = @render_start_at
-    end
-
-    def start
-      Thread.current[:liquid_profiler] = self
-      @render_start_at = Time.now
-    end
-
-    def stop
-      Thread.current[:liquid_profiler] = nil
-      @render_end_at = Time.now
-    end
-
-    def total_render_time
-      @render_end_at - @render_start_at
-    end
-
     def each(&block)
-      @root_timing.children.each(&block)
+      children.each(&block)
     end
 
     def [](idx)
-      @root_timing.children[idx]
+      children[idx]
     end
 
     def length
-      @root_timing.children.length
+      children.length
     end
 
-    def start_node(node)
-      @timing_stack.push(Timing.start(node, current_partial))
+    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
 
-    def end_node(_node)
-      timing = @timing_stack.pop
-      timing.finish
+    private
 
-      @timing_stack.last.children << timing
-    end
-
-    def current_partial
-      @partial_stack.last
-    end
-
-    def push_partial(partial_name)
-      @partial_stack.push(partial_name)
-    end
-
-    def pop_partial
-      @partial_stack.pop
+    def monotonic_time
+      Process.clock_gettime(Process::CLOCK_MONOTONIC)
     end
   end
 end

lib/liquid/profiler/hooks.rb

@@ -1,25 +1,35 @@
 # frozen_string_literal: true
 
 module Liquid
-  class BlockBody
-    def render_node_with_profiling(context, output, node)
-      Profiler.profile_node_render(node) do
-        render_node_without_profiling(context, output, node)
+  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
-
-    alias_method :render_node_without_profiling, :render_node
-    alias_method :render_node, :render_node_with_profiling
   end
+  BlockBody.prepend(BlockBodyProfilingHook)
 
-  class Include < Tag
-    def render_to_output_buffer_with_profiling(context, output)
-      Profiler.profile_children(context.evaluate(@template_name_expr).to_s) do
-        render_to_output_buffer_without_profiling(context, output)
-      end
+  module DocumentProfilingHook
+    def render_to_output_buffer(context, output)
+      return super unless context.profiler
+      context.profiler.profile(context.template_name) { super }
     end
-
-    alias_method :render_to_output_buffer_without_profiling, :render_to_output_buffer
-    alias_method :render_to_output_buffer, :render_to_output_buffer_with_profiling
   end
+  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/registers/disabled_tags.rb

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

lib/liquid/resource_limits.rb

@@ -2,8 +2,8 @@
 
 module Liquid
   class ResourceLimits
-    attr_accessor :render_length, :render_score, :assign_score,
-      :render_length_limit, :render_score_limit, :assign_score_limit
+    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]
@@ -12,14 +12,51 @@ module Liquid
       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?
-      (@render_length_limit && @render_length > @render_length_limit) ||
-        (@render_score_limit && @render_score > @render_score_limit) ||
-        (@assign_score_limit && @assign_score > @assign_score_limit)
+      @reached_limit
     end
 
     def reset
-      @render_length = @render_score = @assign_score = 0
+      @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

@@ -41,7 +41,7 @@ module Liquid
     end
 
     def escape(input)
-      CGI.escapeHTML(input.to_s).untaint unless input.nil?
+      CGI.escapeHTML(input.to_s) unless input.nil?
     end
     alias_method :h, :escape
 
@@ -89,13 +89,15 @@ module Liquid
 
     def truncatewords(input, words = 15, truncate_string = "...")
       return if input.nil?
-      wordlist = input.to_s.split
-      words    = Utils.to_integer(words)
+      input = input.to_s
+      words = Utils.to_integer(words)
+      words = 1 if words <= 0
 
-      l = words - 1
-      l = 0 if l < 0
+      wordlist = input.split(" ", words + 1)
+      return input if wordlist.length <= words
 
-      wordlist.length > l ? wordlist[0..l].join(" ").concat(truncate_string.to_s) : input
+      wordlist.pop
+      wordlist.join(" ").concat(truncate_string.to_s)
     end
 
     # Split input string into an array of substrings separated by given pattern.
@@ -295,7 +297,7 @@ module Liquid
 
     # Add <br /> tags in front of all newlines in input string
     def newline_to_br(input)
-      input.to_s.gsub(/\n/, "<br />\n")
+      input.to_s.gsub(/\r?\n/, "<br />\n")
     end
 
     # Reformat a date using Ruby's core Time#strftime( string ) -> string

lib/liquid/static_registers.rb

@@ -2,7 +2,7 @@
 
 module Liquid
   class StaticRegisters
-    attr_reader :static, :registers
+    attr_reader :static
 
     def initialize(registers = {})
       @static    = registers.is_a?(StaticRegisters) ? registers.static : registers
@@ -25,8 +25,16 @@ module Liquid
       @registers.delete(key)
     end
 
-    def fetch(key, default = nil)
-      key?(key) ? self[key] : default
+    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)

lib/liquid/strainer.rb

@@ -1,68 +0,0 @@
-# frozen_string_literal: true
-
-require 'set'
-
-module Liquid
-  # Strainer is the parent class for the filters system.
-  # New filters are mixed into the strainer class which is then instantiated for each liquid template render run.
-  #
-  # The Strainer only allows method calls defined in filters given to it via Strainer.global_filter,
-  # Context#add_filters or Template.register_filter
-  class Strainer #:nodoc:
-    @@global_strainer = Class.new(Strainer) do
-      @filter_methods = Set.new
-    end
-    @@strainer_class_cache = Hash.new do |hash, filters|
-      hash[filters] = Class.new(@@global_strainer) do
-        @filter_methods = @@global_strainer.filter_methods.dup
-        filters.each { |f| add_filter(f) }
-      end
-    end
-
-    def initialize(context)
-      @context = context
-    end
-
-    class << self
-      attr_reader :filter_methods
-    end
-
-    def self.add_filter(filter)
-      raise ArgumentError, "Expected module but got: #{filter.class}" unless filter.is_a?(Module)
-      unless 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(', ')}"
-        else
-          send(:include, filter)
-          @filter_methods.merge(filter.public_instance_methods.map(&:to_s))
-        end
-      end
-    end
-
-    def self.global_filter(filter)
-      @@strainer_class_cache.clear
-      @@global_strainer.add_filter(filter)
-    end
-
-    def self.invokable?(method)
-      @filter_methods.include?(method.to_s)
-    end
-
-    def self.create(context, filters = [])
-      @@strainer_class_cache[filters].new(context)
-    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/strainer_factory.rb

@@ -0,0 +1,36 @@
+# 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

@@ -0,0 +1,53 @@
+# 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/tag.rb

@@ -13,15 +13,13 @@ module Liquid
         tag
       end
 
-      def disable_tags(*tags)
-        disabled_tags.push(*tags)
+      def disable_tags(*tag_names)
+        @disabled_tags ||= []
+        @disabled_tags.concat(tag_names)
+        prepend(Disabler)
       end
 
       private :new
-
-      def disabled_tags
-        @disabled_tags ||= []
-      end
     end
 
     def initialize(tag_name, markup, parse_context)
@@ -46,14 +44,6 @@ module Liquid
       ''
     end
 
-    def disabled?(context)
-      context.registers[:disabled_tags].disabled?(tag_name)
-    end
-
-    def disabled_error_message
-      "#{tag_name} #{options[:locale].t('errors.disabled.tag')}"
-    end
-
     # For backwards compatibility with custom tags. In a future release, the semantics
     # of the `render_to_output_buffer` method will become the default and the `render`
     # method will be removed.
@@ -66,8 +56,10 @@ module Liquid
       false
     end
 
-    def disabled_tags
-      self.class.disabled_tags
+    private
+
+    def parse_expression(markup)
+      parse_context.parse_expression(markup)
     end
   end
 end

lib/liquid/tag/disableable.rb

@@ -0,0 +1,22 @@
+# 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

@@ -0,0 +1,21 @@
+# 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

@@ -12,26 +12,27 @@ module Liquid
   class Assign < Tag
     Syntax = /(#{VariableSignature}+)\s*=\s*(.*)\s*/om
 
-    def self.syntax_error_translation_key
-      "errors.syntax.assign"
+    # @api private
+    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, options)
+    def initialize(tag_name, markup, parse_context)
       super
       if markup =~ Syntax
         @to   = Regexp.last_match(1)
-        @from = Variable.new(Regexp.last_match(2), options)
+        @from = Variable.new(Regexp.last_match(2), parse_context)
       else
-        raise SyntaxError, options[:locale].t(self.class.syntax_error_translation_key)
+        self.class.raise_syntax_error(parse_context)
       end
     end
 
     def render_to_output_buffer(context, output)
       val = @from.render(context)
       context.scopes.last[@to] = val
-      context.resource_limits.assign_score += assign_score_of(val)
+      context.resource_limits.increment_assign_score(assign_score_of(val))
       output
     end
 
@@ -44,11 +45,18 @@ module Liquid
     def assign_score_of(val)
       if val.instance_of?(String)
         val.bytesize
-      elsif val.instance_of?(Array) || val.instance_of?(Hash)
+      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

lib/liquid/tags/break.rb

@@ -11,8 +11,11 @@ module Liquid
   #    {% endfor %}
   #
   class Break < Tag
-    def interrupt
-      BreakInterrupt.new
+    INTERRUPT = BreakInterrupt.new.freeze
+
+    def render_to_output_buffer(context, output)
+      context.push_interrupt(INTERRUPT)
+      output
     end
   end
 

lib/liquid/tags/capture.rb

@@ -25,10 +25,10 @@ module Liquid
     end
 
     def render_to_output_buffer(context, output)
-      previous_output_size = output.bytesize
-      super
-      context.scopes.last[@to] = output
-      context.resource_limits.assign_score += (output.bytesize - previous_output_size)
+      context.resource_limits.with_capture do
+        capture_output = render(context)
+        context.scopes.last[@to] = capture_output
+      end
       output
     end
 

lib/liquid/tags/case.rb

@@ -12,15 +12,23 @@ module Liquid
       @blocks = []
 
       if markup =~ Syntax
-        @left = Expression.parse(Regexp.last_match(1))
+        @left = parse_expression(Regexp.last_match(1))
       else
         raise SyntaxError, options[:locale].t("errors.syntax.case")
       end
     end
 
     def parse(tokens)
-      body = BlockBody.new
+      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
@@ -56,7 +64,7 @@ module Liquid
     private
 
     def record_when_condition(markup)
-      body = BlockBody.new
+      body = new_body
 
       while markup
         unless markup =~ WhenSyntax
@@ -65,7 +73,7 @@ module Liquid
 
         markup = Regexp.last_match(2)
 
-        block = Condition.new(@left, '==', Expression.parse(Regexp.last_match(1)))
+        block = Condition.new(@left, '==', Condition.parse_expression(parse_context, Regexp.last_match(1)))
         block.attach(body)
         @blocks << block
       end
@@ -77,7 +85,7 @@ module Liquid
       end
 
       block = ElseCondition.new
-      block.attach(BlockBody.new)
+      block.attach(new_body)
       @blocks << block
     end
 

lib/liquid/tags/continue.rb

@@ -11,8 +11,11 @@ module Liquid
   #    {% endfor %}
   #
   class Continue < Tag
-    def interrupt
-      ContinueInterrupt.new
+    INTERRUPT = ContinueInterrupt.new.freeze
+
+    def render_to_output_buffer(context, output)
+      context.push_interrupt(INTERRUPT)
+      output
     end
   end
 

lib/liquid/tags/cycle.rb

@@ -24,7 +24,7 @@ module Liquid
       case markup
       when NamedSyntax
         @variables = variables_from_string(Regexp.last_match(2))
-        @name      = Expression.parse(Regexp.last_match(1))
+        @name      = parse_expression(Regexp.last_match(1))
       when SimpleSyntax
         @variables = variables_from_string(markup)
         @name      = @variables.to_s
@@ -61,7 +61,7 @@ module Liquid
     def variables_from_string(markup)
       markup.split(',').collect do |var|
         var =~ /\s*(#{QuotedFragment})\s*/o
-        Regexp.last_match(1) ? Expression.parse(Regexp.last_match(1)) : nil
+        Regexp.last_match(1) ? parse_expression(Regexp.last_match(1)) : nil
       end.compact
     end
 

lib/liquid/tags/for.rb

@@ -54,13 +54,20 @@ module Liquid
       super
       @from = @limit = nil
       parse_with_selected_parser(markup)
-      @for_block = BlockBody.new
+      @for_block = new_body
       @else_block = nil
     end
 
     def parse(tokens)
-      return unless parse_body(@for_block, tokens)
-      parse_body(@else_block, 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
@@ -69,7 +76,7 @@ module Liquid
 
     def unknown_tag(tag, markup, tokens)
       return super unless tag == 'else'
-      @else_block = BlockBody.new
+      @else_block = new_body
     end
 
     def render_to_output_buffer(context, output)
@@ -92,7 +99,7 @@ module Liquid
         collection_name  = Regexp.last_match(2)
         @reversed        = !!Regexp.last_match(3)
         @name            = "#{@variable_name}-#{collection_name}"
-        @collection_name = Expression.parse(collection_name)
+        @collection_name = parse_expression(collection_name)
         markup.scan(TagAttributes) do |key, value|
           set_attribute(key, value)
         end
@@ -107,7 +114,7 @@ module Liquid
       raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_in") unless p.id?('in')
 
       collection_name  = p.expression
-      @collection_name = Expression.parse(collection_name)
+      @collection_name = parse_expression(collection_name)
 
       @name     = "#{@variable_name}-#{collection_name}"
       @reversed = p.id?('reversed')
@@ -191,12 +198,13 @@ module Liquid
       case key
       when 'offset'
         @from = if expr == 'continue'
+          Usage.increment('for_offset_continue')
           :continue
         else
-          Expression.parse(expr)
+          parse_expression(expr)
         end
       when 'limit'
-        @limit = Expression.parse(expr)
+        @limit = parse_expression(expr)
       end
     end
 

lib/liquid/tags/if.rb

@@ -31,10 +31,17 @@ module Liquid
     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 ['elsif', 'else'].include?(tag)
+      if ELSE_TAG_NAMES.include?(tag)
         push_block(tag, markup)
       else
         super
@@ -61,21 +68,25 @@ module Liquid
       end
 
       @blocks.push(block)
-      block.attach(BlockBody.new)
+      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(Expression.parse(Regexp.last_match(1)), Regexp.last_match(2), Expression.parse(Regexp.last_match(3)))
+      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(Expression.parse(Regexp.last_match(1)), Regexp.last_match(2), Expression.parse(Regexp.last_match(3)))
+        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
@@ -103,9 +114,9 @@ module Liquid
     end
 
     def parse_comparison(p)
-      a = Expression.parse(p.expression)
+      a = parse_expression(p.expression)
       if (op = p.consume?(:comparison))
-        b = Expression.parse(p.expression)
+        b = parse_expression(p.expression)
         Condition.new(a, op, b)
       else
         Condition.new(a)

lib/liquid/tags/include.rb

@@ -16,6 +16,8 @@ module Liquid
   #   {% include 'product' for products %}
   #
   class Include < Tag
+    prepend Tag::Disableable
+
     SYNTAX = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o
     Syntax = SYNTAX
 
@@ -30,12 +32,12 @@ module Liquid
         variable_name = Regexp.last_match(3)
 
         @alias_name         = Regexp.last_match(5)
-        @variable_name_expr = variable_name ? Expression.parse(variable_name) : nil
-        @template_name_expr = Expression.parse(template_name)
+        @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] = Expression.parse(value)
+          @attributes[key] = parse_expression(value)
         end
 
       else

lib/liquid/tags/inline_comment.rb

@@ -0,0 +1,25 @@
+# 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

@@ -14,14 +14,14 @@ module Liquid
     def parse(tokens)
       @body = +''
       while (token = tokens.shift)
-        if token =~ FullTokenPossiblyInvalid
+        if token =~ FullTokenPossiblyInvalid && block_delimiter == Regexp.last_match(2)
           @body << Regexp.last_match(1) if Regexp.last_match(1) != ""
-          return if block_delimiter == Regexp.last_match(2)
+          return
         end
         @body << token unless token.empty?
       end
 
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
+      raise_tag_never_closed(block_name)
     end
 
     def render_to_output_buffer(_context, output)

lib/liquid/tags/render.rb

@@ -19,13 +19,13 @@ module Liquid
       variable_name = Regexp.last_match(4)
 
       @alias_name = Regexp.last_match(6)
-      @variable_name_expr = variable_name ? Expression.parse(variable_name) : nil
-      @template_name_expr = Expression.parse(template_name)
+      @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] = Expression.parse(value)
+        @attributes[key] = parse_expression(value)
       end
     end
 

lib/liquid/tags/table_row.rb

@@ -10,10 +10,10 @@ module Liquid
       super
       if markup =~ Syntax
         @variable_name   = Regexp.last_match(1)
-        @collection_name = Expression.parse(Regexp.last_match(2))
+        @collection_name = parse_expression(Regexp.last_match(2))
         @attributes      = {}
         markup.scan(TagAttributes) do |key, value|
-          @attributes[key] = Expression.parse(value)
+          @attributes[key] = parse_expression(value)
         end
       else
         raise SyntaxError, options[:locale].t("errors.syntax.table_row")

lib/liquid/template.rb

@@ -18,8 +18,6 @@ module Liquid
     attr_accessor :root
     attr_reader :resource_limits, :warnings
 
-    @@file_system = BlankFileSystem.new
-
     class TagRegistry
       include Enumerable
 
@@ -63,84 +61,54 @@ module Liquid
       # :lax acts like liquid 2.5 and silently ignores malformed tags in most cases.
       # :warn is the default and will give deprecation warnings when invalid syntax is used.
       # :strict will enforce correct syntax.
-      attr_writer :error_mode
-
-      # Sets how strict the taint checker should be.
-      # :lax is the default, and ignores the taint flag completely
-      # :warn adds a warning, but does not interrupt the rendering
-      # :error raises an error when tainted output is used
-      attr_writer :taint_mode
+      attr_accessor :error_mode
+      Template.error_mode = :lax
 
       attr_accessor :default_exception_renderer
       Template.default_exception_renderer = lambda do |exception|
         exception
       end
 
-      def file_system
-        @@file_system
-      end
+      attr_accessor :file_system
+      Template.file_system = BlankFileSystem.new
 
-      def file_system=(obj)
-        @@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 ||= TagRegistry.new
-      end
-
-      def add_register(name, klass)
-        registers[name.to_sym] = klass
-      end
-
-      def registers
-        @registers ||= {}
-      end
-
-      def error_mode
-        @error_mode ||= :lax
-      end
-
-      def taint_mode
-        @taint_mode ||= :lax
-      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)
-        Strainer.global_filter(mod)
+        StrainerFactory.add_global_filter(mod)
       end
 
-      def default_resource_limits
-        @default_resource_limits ||= {}
-      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.
       # See Liquid::Profiler for more information
       def parse(source, options = {})
-        template = Template.new
-        template.parse(source, options)
+        new.parse(source, options)
       end
     end
 
     def initialize
       @rethrow_errors  = false
-      @resource_limits = ResourceLimits.new(self.class.default_resource_limits)
+      @resource_limits = ResourceLimits.new(Template.default_resource_limits)
     end
 
     # Parse source code.
     # Returns self for easy chaining
     def parse(source, options = {})
-      @options      = options
-      @profiling    = options[:profile]
-      @line_numbers = options[:line_numbers] || @profiling
-      parse_context = options.is_a?(ParseContext) ? options : ParseContext.new(options)
-      @root         = Document.parse(tokenize(source), parse_context)
-      @warnings     = parse_context.warnings
+      parse_context = configure_options(options)
+      tokenizer     = parse_context.new_tokenizer(source, start_line_number: @line_numbers && 1)
+      @root         = Document.parse(tokenizer, parse_context)
       self
     end
 
@@ -182,7 +150,7 @@ module Liquid
         c = args.shift
 
         if @rethrow_errors
-          c.exception_renderer = ->(_e) { raise }
+          c.exception_renderer = Liquid::RAISE_EXCEPTION_LAMBDA
         end
 
         c
@@ -215,19 +183,16 @@ module Liquid
         context.add_filters(args.pop)
       end
 
-      Template.registers.each do |key, register|
-        context_register[key] = register
-      end
-
       # Retrying a render resets resource usage
       context.resource_limits.reset
 
+      if @profiling && context.profiler.nil?
+        @profiler = context.profiler = Liquid::Profiler.new
+      end
+
       begin
         # render the nodelist.
-        # for performance reasons we get an array back here. join will make a string out of it.
-        with_profiling(context) do
-          @root.render_to_output_buffer(context, output || +'')
-        end
+        @root.render_to_output_buffer(context, output || +'')
       rescue Liquid::MemoryError => e
         context.handle_error(e)
       ensure
@@ -246,25 +211,17 @@ module Liquid
 
     private
 
-    def tokenize(source)
-      Tokenizer.new(source, @line_numbers)
-    end
-
-    def with_profiling(context)
-      if @profiling && !context.partial
+    def configure_options(options)
+      if (profiling = options[:profile])
         raise "Profiler not loaded, require 'liquid/profiler' first" unless defined?(Liquid::Profiler)
-
-        @profiler = Profiler.new(context.template_name)
-        @profiler.start
-
-        begin
-          yield
-        ensure
-          @profiler.stop
-        end
-      else
-        yield
       end
+
+      @options      = options
+      @profiling    = profiling
+      @line_numbers = options[:line_numbers] || @profiling
+      parse_context = options.is_a?(ParseContext) ? options : ParseContext.new(options)
+      @warnings     = parse_context.warnings
+      parse_context
     end
 
     def apply_options_to_context(context, options)

lib/liquid/template_factory.rb

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

lib/liquid/variable.rb

@@ -30,7 +30,7 @@ module Liquid
       @parse_context = parse_context
       @line_number   = parse_context.line_number
 
-      parse_with_selected_parser(markup)
+      strict_parse_with_error_mode_fallback(markup)
     end
 
     def raw
@@ -63,6 +63,8 @@ module Liquid
       @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)
@@ -81,14 +83,14 @@ module Liquid
     end
 
     def render(context)
-      obj = @filters.inject(context.evaluate(@name)) do |output, (filter_name, filter_args, filter_kwargs)|
+      obj = context.evaluate(@name)
+
+      @filters.each do |filter_name, filter_args, filter_kwargs|
         filter_args = evaluate_filter_expressions(context, filter_args, filter_kwargs)
-        context.invoke(filter_name, output, *filter_args)
+        obj = context.invoke(filter_name, obj, *filter_args)
       end
 
-      obj = context.apply_global_filter(obj)
-      taint_check(context, obj)
-      obj
+      context.apply_global_filter(obj)
     end
 
     def render_to_output_buffer(context, output)
@@ -142,25 +144,6 @@ module Liquid
       parsed_args
     end
 
-    def taint_check(context, obj)
-      return unless obj.tainted?
-      return if Template.taint_mode == :lax
-
-      @markup =~ QuotedFragment
-      name = Regexp.last_match(0)
-
-      error               = TaintedError.new("variable '#{name}' is tainted and was not escaped")
-      error.line_number   = line_number
-      error.template_name = context.template_name
-
-      case Template.taint_mode
-      when :warn
-        context.warnings << error
-      when :error
-        raise error
-      end
-    end
-
     class ParseTreeVisitor < Liquid::ParseTreeVisitor
       def children
         [@node.name] + @node.filters.flatten

lib/liquid/version.rb

@@ -2,5 +2,5 @@
 # frozen_string_literal: true
 
 module Liquid
-  VERSION = "4.0.3"
+  VERSION = "5.0.0"
 end

liquid.gemspec

@@ -17,9 +17,11 @@ Gem::Specification.new do |s|
   s.license     = "MIT"
   # s.description = "A secure, non-evaling end user template engine with aesthetic markup."
 
-  s.required_ruby_version     = ">= 2.4.0"
+  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)
 
@@ -27,6 +29,6 @@ Gem::Specification.new do |s|
 
   s.require_path = "lib"
 
-  s.add_development_dependency('rake', '~> 11.3')
+  s.add_development_dependency('rake', '~> 13.0')
   s.add_development_dependency('minitest')
 end

performance/shopify/shop_filter.rb

@@ -60,7 +60,7 @@ module ShopFilter
 
     case style
     when 'original'
-      return '/files/shops/random_number/' + url
+      '/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)}"
     else

performance/theme_runner.rb

@@ -73,10 +73,14 @@ class ThemeRunner
 
   private
 
+  def render_layout(template, layout, assigns)
+    assigns['content_for_layout'] = template.render!(assigns)
+    layout&.render!(assigns)
+  end
+
   def compile_and_render(template, layout, assigns, page_template, template_file)
-    compiled_test                 = compile_test(template, layout, assigns, page_template, template_file)
-    assigns['content_for_layout'] = compiled_test[:tmpl].render!(assigns)
-    compiled_test[:layout].render!(assigns) if layout
+    compiled_test = compile_test(template, layout, assigns, page_template, template_file)
+    render_layout(compiled_test[:tmpl], compiled_test[:layout], compiled_test[:assigns])
   end
 
   def compile_all_tests

test/integration/assign_test.rb

@@ -44,7 +44,74 @@ class AssignTest < Minitest::Test
       end
     end
     with_error_mode(:lax) do
-      assert Template.parse("{% assign foo = ('X' | downcase) %}")
+      assert(Template.parse("{% assign foo = ('X' | downcase) %}"))
     end
   end
-end # AssignTest
+
+  def test_expression_with_whitespace_in_square_brackets
+    source = "{% assign r = a[ 'b' ] %}{{ r }}"
+    assert_template_result('result', source, 'a' => { 'b' => 'result' })
+  end
+
+  def test_assign_score_exceeding_resource_limit
+    t = Template.parse("{% assign foo = 42 %}{% assign bar = 23 %}")
+    t.resource_limits.assign_score_limit = 1
+    assert_equal("Liquid error: Memory limits exceeded", t.render)
+    assert(t.resource_limits.reached?)
+
+    t.resource_limits.assign_score_limit = 2
+    assert_equal("", t.render!)
+    refute_nil(t.resource_limits.assign_score)
+  end
+
+  def test_assign_score_exceeding_limit_from_composite_object
+    t = Template.parse("{% assign foo = 'aaaa' | reverse %}")
+
+    t.resource_limits.assign_score_limit = 3
+    assert_equal("Liquid error: Memory limits exceeded", t.render)
+    assert(t.resource_limits.reached?)
+
+    t.resource_limits.assign_score_limit = 5
+    assert_equal("", t.render!)
+  end
+
+  def test_assign_score_of_int
+    assert_equal(1, assign_score_of(123))
+  end
+
+  def test_assign_score_of_string_counts_bytes
+    assert_equal(3, assign_score_of('123'))
+    assert_equal(5, assign_score_of('12345'))
+    assert_equal(9, assign_score_of('すごい'))
+  end
+
+  def test_assign_score_of_array
+    assert_equal(1, assign_score_of([]))
+    assert_equal(2, assign_score_of([123]))
+    assert_equal(6, assign_score_of([123, 'abcd']))
+  end
+
+  def test_assign_score_of_hash
+    assert_equal(1, assign_score_of({}))
+    assert_equal(5, assign_score_of('int' => 123))
+    assert_equal(12, assign_score_of('int' => 123, 'str' => 'abcd'))
+  end
+
+  private
+
+  class ObjectWrapperDrop < Liquid::Drop
+    def initialize(obj)
+      @obj = obj
+    end
+
+    def value
+      @obj
+    end
+  end
+
+  def assign_score_of(obj)
+    context = Liquid::Context.new('drop' => ObjectWrapperDrop.new(obj))
+    Liquid::Template.parse('{% assign obj = drop.value %}').render!(context)
+    context.resource_limits.assign_score
+  end
+end

test/integration/block_test.rb

@@ -11,4 +11,48 @@ class BlockTest < Minitest::Test
     end
     assert_equal(exc.message, "Liquid syntax error: 'endunless' is not a valid delimiter for if tags. use endif")
   end
+
+  def test_with_custom_tag
+    with_custom_tag('testtag', Block) do
+      assert(Liquid::Template.parse("{% testtag %} {% endtesttag %}"))
+    end
+  end
+
+  def test_custom_block_tags_have_a_default_render_to_output_buffer_method_for_backwards_compatibility
+    klass1 = Class.new(Block) do
+      def render(*)
+        'hello'
+      end
+    end
+
+    with_custom_tag('blabla', klass1) do
+      template = Liquid::Template.parse("{% blabla %} bla {% endblabla %}")
+
+      assert_equal('hello', template.render)
+
+      buf    = +''
+      output = template.render({}, output: buf)
+      assert_equal('hello', output)
+      assert_equal('hello', buf)
+      assert_equal(buf.object_id, output.object_id)
+    end
+
+    klass2 = Class.new(klass1) do
+      def render(*)
+        'foo' + super + 'bar'
+      end
+    end
+
+    with_custom_tag('blabla', klass2) do
+      template = Liquid::Template.parse("{% blabla %} foo {% endblabla %}")
+
+      assert_equal('foohellobar', template.render)
+
+      buf    = +''
+      output = template.render({}, output: buf)
+      assert_equal('foohellobar', output)
+      assert_equal('foohellobar', buf)
+      assert_equal(buf.object_id, output.object_id)
+    end
+  end
 end

test/integration/capture_test.rb

@@ -49,4 +49,10 @@ class CaptureTest < Minitest::Test
     rendered        = template.render!
     assert_equal("3-3", rendered.gsub(/\s/, ''))
   end
-end # CaptureTest
+
+  def test_increment_assign_score_by_bytes_not_characters
+    t = Template.parse("{% capture foo %}すごい{% endcapture %}")
+    t.render!
+    assert_equal(9, t.resource_limits.assign_score)
+  end
+end

test/integration/context_test.rb

@@ -2,9 +2,597 @@
 
 require 'test_helper'
 
+class HundredCentes
+  def to_liquid
+    100
+  end
+end
+
+class CentsDrop < Liquid::Drop
+  def amount
+    HundredCentes.new
+  end
+
+  def non_zero?
+    true
+  end
+end
+
+class ContextSensitiveDrop < Liquid::Drop
+  def test
+    @context['test']
+  end
+end
+
+class Category < Liquid::Drop
+  attr_accessor :name
+
+  def initialize(name)
+    @name = name
+  end
+
+  def to_liquid
+    CategoryDrop.new(self)
+  end
+end
+
+class CategoryDrop
+  attr_accessor :category, :context
+  def initialize(category)
+    @category = category
+  end
+end
+
+class CounterDrop < Liquid::Drop
+  def count
+    @count ||= 0
+    @count  += 1
+  end
+end
+
+class ArrayLike
+  def fetch(index)
+  end
+
+  def [](index)
+    @counts        ||= []
+    @counts[index] ||= 0
+    @counts[index]  += 1
+  end
+
+  def to_liquid
+    self
+  end
+end
+
 class ContextTest < Minitest::Test
   include Liquid
 
+  def setup
+    @context = Liquid::Context.new
+  end
+
+  def test_variables
+    @context['string'] = 'string'
+    assert_equal('string', @context['string'])
+
+    @context['num'] = 5
+    assert_equal(5, @context['num'])
+
+    @context['time'] = Time.parse('2006-06-06 12:00:00')
+    assert_equal(Time.parse('2006-06-06 12:00:00'), @context['time'])
+
+    @context['date'] = Date.today
+    assert_equal(Date.today, @context['date'])
+
+    now = Time.now
+    @context['datetime'] = now
+    assert_equal(now, @context['datetime'])
+
+    @context['bool'] = true
+    assert_equal(true, @context['bool'])
+
+    @context['bool'] = false
+    assert_equal(false, @context['bool'])
+
+    @context['nil'] = nil
+    assert_nil(@context['nil'])
+    assert_nil(@context['nil'])
+  end
+
+  def test_variables_not_existing
+    assert_nil(@context['does_not_exist'])
+  end
+
+  def test_scoping
+    @context.push
+    @context.pop
+
+    assert_raises(Liquid::ContextError) do
+      @context.pop
+    end
+
+    assert_raises(Liquid::ContextError) do
+      @context.push
+      @context.pop
+      @context.pop
+    end
+  end
+
+  def test_length_query
+    @context['numbers'] = [1, 2, 3, 4]
+
+    assert_equal(4, @context['numbers.size'])
+
+    @context['numbers'] = { 1 => 1, 2 => 2, 3 => 3, 4 => 4 }
+
+    assert_equal(4, @context['numbers.size'])
+
+    @context['numbers'] = { 1 => 1, 2 => 2, 3 => 3, 4 => 4, 'size' => 1000 }
+
+    assert_equal(1000, @context['numbers.size'])
+  end
+
+  def test_hyphenated_variable
+    @context['oh-my'] = 'godz'
+    assert_equal('godz', @context['oh-my'])
+  end
+
+  def test_add_filter
+    filter = Module.new do
+      def hi(output)
+        output + ' hi!'
+      end
+    end
+
+    context = Context.new
+    context.add_filters(filter)
+    assert_equal('hi? hi!', context.invoke(:hi, 'hi?'))
+
+    context = Context.new
+    assert_equal('hi?', context.invoke(:hi, 'hi?'))
+
+    context.add_filters(filter)
+    assert_equal('hi? hi!', context.invoke(:hi, 'hi?'))
+  end
+
+  def test_only_intended_filters_make_it_there
+    filter = Module.new do
+      def hi(output)
+        output + ' hi!'
+      end
+    end
+
+    context = Context.new
+    assert_equal("Wookie", context.invoke("hi", "Wookie"))
+
+    context.add_filters(filter)
+    assert_equal("Wookie hi!", context.invoke("hi", "Wookie"))
+  end
+
+  def test_add_item_in_outer_scope
+    @context['test'] = 'test'
+    @context.push
+    assert_equal('test', @context['test'])
+    @context.pop
+    assert_equal('test', @context['test'])
+  end
+
+  def test_add_item_in_inner_scope
+    @context.push
+    @context['test'] = 'test'
+    assert_equal('test', @context['test'])
+    @context.pop
+    assert_nil(@context['test'])
+  end
+
+  def test_hierachical_data
+    @context['hash'] = { "name" => 'tobi' }
+    assert_equal('tobi', @context['hash.name'])
+    assert_equal('tobi', @context['hash["name"]'])
+  end
+
+  def test_keywords
+    assert_equal(true, @context['true'])
+    assert_equal(false, @context['false'])
+  end
+
+  def test_digits
+    assert_equal(100, @context['100'])
+    assert_equal(100.00, @context['100.00'])
+  end
+
+  def test_strings
+    assert_equal("hello!", @context['"hello!"'])
+    assert_equal("hello!", @context["'hello!'"])
+  end
+
+  def test_merge
+    @context.merge("test" => "test")
+    assert_equal('test', @context['test'])
+    @context.merge("test" => "newvalue", "foo" => "bar")
+    assert_equal('newvalue', @context['test'])
+    assert_equal('bar', @context['foo'])
+  end
+
+  def test_array_notation
+    @context['test'] = [1, 2, 3, 4, 5]
+
+    assert_equal(1, @context['test[0]'])
+    assert_equal(2, @context['test[1]'])
+    assert_equal(3, @context['test[2]'])
+    assert_equal(4, @context['test[3]'])
+    assert_equal(5, @context['test[4]'])
+  end
+
+  def test_recoursive_array_notation
+    @context['test'] = { 'test' => [1, 2, 3, 4, 5] }
+
+    assert_equal(1, @context['test.test[0]'])
+
+    @context['test'] = [{ 'test' => 'worked' }]
+
+    assert_equal('worked', @context['test[0].test'])
+  end
+
+  def test_hash_to_array_transition
+    @context['colors'] = {
+      'Blue' => ['003366', '336699', '6699CC', '99CCFF'],
+      'Green' => ['003300', '336633', '669966', '99CC99'],
+      'Yellow' => ['CC9900', 'FFCC00', 'FFFF99', 'FFFFCC'],
+      'Red' => ['660000', '993333', 'CC6666', 'FF9999'],
+    }
+
+    assert_equal('003366', @context['colors.Blue[0]'])
+    assert_equal('FF9999', @context['colors.Red[3]'])
+  end
+
+  def test_try_first
+    @context['test'] = [1, 2, 3, 4, 5]
+
+    assert_equal(1, @context['test.first'])
+    assert_equal(5, @context['test.last'])
+
+    @context['test'] = { 'test' => [1, 2, 3, 4, 5] }
+
+    assert_equal(1, @context['test.test.first'])
+    assert_equal(5, @context['test.test.last'])
+
+    @context['test'] = [1]
+    assert_equal(1, @context['test.first'])
+    assert_equal(1, @context['test.last'])
+  end
+
+  def test_access_hashes_with_hash_notation
+    @context['products'] = { 'count' => 5, 'tags' => ['deepsnow', 'freestyle'] }
+    @context['product']  = { 'variants' => [{ 'title' => 'draft151cm' }, { 'title' => 'element151cm' }] }
+
+    assert_equal(5, @context['products["count"]'])
+    assert_equal('deepsnow', @context['products["tags"][0]'])
+    assert_equal('deepsnow', @context['products["tags"].first'])
+    assert_equal('draft151cm', @context['product["variants"][0]["title"]'])
+    assert_equal('element151cm', @context['product["variants"][1]["title"]'])
+    assert_equal('draft151cm', @context['product["variants"][0]["title"]'])
+    assert_equal('element151cm', @context['product["variants"].last["title"]'])
+  end
+
+  def test_access_variable_with_hash_notation
+    @context['foo'] = 'baz'
+    @context['bar'] = 'foo'
+
+    assert_equal('baz', @context['["foo"]'])
+    assert_equal('baz', @context['[bar]'])
+  end
+
+  def test_access_hashes_with_hash_access_variables
+    @context['var']      = 'tags'
+    @context['nested']   = { 'var' => 'tags' }
+    @context['products'] = { 'count' => 5, 'tags' => ['deepsnow', 'freestyle'] }
+
+    assert_equal('deepsnow', @context['products[var].first'])
+    assert_equal('freestyle', @context['products[nested.var].last'])
+  end
+
+  def test_hash_notation_only_for_hash_access
+    @context['array'] = [1, 2, 3, 4, 5]
+    @context['hash']  = { 'first' => 'Hello' }
+
+    assert_equal(1, @context['array.first'])
+    assert_nil(@context['array["first"]'])
+    assert_equal('Hello', @context['hash["first"]'])
+  end
+
+  def test_first_can_appear_in_middle_of_callchain
+    @context['product'] = { 'variants' => [{ 'title' => 'draft151cm' }, { 'title' => 'element151cm' }] }
+
+    assert_equal('draft151cm', @context['product.variants[0].title'])
+    assert_equal('element151cm', @context['product.variants[1].title'])
+    assert_equal('draft151cm', @context['product.variants.first.title'])
+    assert_equal('element151cm', @context['product.variants.last.title'])
+  end
+
+  def test_cents
+    @context.merge("cents" => HundredCentes.new)
+    assert_equal(100, @context['cents'])
+  end
+
+  def test_nested_cents
+    @context.merge("cents" => { 'amount' => HundredCentes.new })
+    assert_equal(100, @context['cents.amount'])
+
+    @context.merge("cents" => { 'cents' => { 'amount' => HundredCentes.new } })
+    assert_equal(100, @context['cents.cents.amount'])
+  end
+
+  def test_cents_through_drop
+    @context.merge("cents" => CentsDrop.new)
+    assert_equal(100, @context['cents.amount'])
+  end
+
+  def test_nested_cents_through_drop
+    @context.merge("vars" => { "cents" => CentsDrop.new })
+    assert_equal(100, @context['vars.cents.amount'])
+  end
+
+  def test_drop_methods_with_question_marks
+    @context.merge("cents" => CentsDrop.new)
+    assert(@context['cents.non_zero?'])
+  end
+
+  def test_context_from_within_drop
+    @context.merge("test" => '123', "vars" => ContextSensitiveDrop.new)
+    assert_equal('123', @context['vars.test'])
+  end
+
+  def test_nested_context_from_within_drop
+    @context.merge("test" => '123', "vars" => { "local" => ContextSensitiveDrop.new })
+    assert_equal('123', @context['vars.local.test'])
+  end
+
+  def test_ranges
+    @context.merge("test" => '5')
+    assert_equal((1..5), @context['(1..5)'])
+    assert_equal((1..5), @context['(1..test)'])
+    assert_equal((5..5), @context['(test..test)'])
+  end
+
+  def test_cents_through_drop_nestedly
+    @context.merge("cents" => { "cents" => CentsDrop.new })
+    assert_equal(100, @context['cents.cents.amount'])
+
+    @context.merge("cents" => { "cents" => { "cents" => CentsDrop.new } })
+    assert_equal(100, @context['cents.cents.cents.amount'])
+  end
+
+  def test_drop_with_variable_called_only_once
+    @context['counter'] = CounterDrop.new
+
+    assert_equal(1, @context['counter.count'])
+    assert_equal(2, @context['counter.count'])
+    assert_equal(3, @context['counter.count'])
+  end
+
+  def test_drop_with_key_called_only_once
+    @context['counter'] = CounterDrop.new
+
+    assert_equal(1, @context['counter["count"]'])
+    assert_equal(2, @context['counter["count"]'])
+    assert_equal(3, @context['counter["count"]'])
+  end
+
+  def test_proc_as_variable
+    @context['dynamic'] = proc { 'Hello' }
+
+    assert_equal('Hello', @context['dynamic'])
+  end
+
+  def test_lambda_as_variable
+    @context['dynamic'] = proc { 'Hello' }
+
+    assert_equal('Hello', @context['dynamic'])
+  end
+
+  def test_nested_lambda_as_variable
+    @context['dynamic'] = { "lambda" => proc { 'Hello' } }
+
+    assert_equal('Hello', @context['dynamic.lambda'])
+  end
+
+  def test_array_containing_lambda_as_variable
+    @context['dynamic'] = [1, 2, proc { 'Hello' }, 4, 5]
+
+    assert_equal('Hello', @context['dynamic[2]'])
+  end
+
+  def test_lambda_is_called_once
+    @context['callcount'] = proc {
+      @global ||= 0
+      @global  += 1
+      @global.to_s
+    }
+
+    assert_equal('1', @context['callcount'])
+    assert_equal('1', @context['callcount'])
+    assert_equal('1', @context['callcount'])
+
+    @global = nil
+  end
+
+  def test_nested_lambda_is_called_once
+    @context['callcount'] = { "lambda" => proc {
+                                            @global ||= 0
+                                            @global  += 1
+                                            @global.to_s
+                                          } }
+
+    assert_equal('1', @context['callcount.lambda'])
+    assert_equal('1', @context['callcount.lambda'])
+    assert_equal('1', @context['callcount.lambda'])
+
+    @global = nil
+  end
+
+  def test_lambda_in_array_is_called_once
+    @context['callcount'] = [1, 2, proc {
+                                     @global ||= 0
+                                     @global  += 1
+                                     @global.to_s
+                                   }, 4, 5]
+
+    assert_equal('1', @context['callcount[2]'])
+    assert_equal('1', @context['callcount[2]'])
+    assert_equal('1', @context['callcount[2]'])
+
+    @global = nil
+  end
+
+  def test_access_to_context_from_proc
+    @context.registers[:magic] = 345392
+
+    @context['magic'] = proc { @context.registers[:magic] }
+
+    assert_equal(345392, @context['magic'])
+  end
+
+  def test_to_liquid_and_context_at_first_level
+    @context['category'] = Category.new("foobar")
+    assert_kind_of(CategoryDrop, @context['category'])
+    assert_equal(@context, @context['category'].context)
+  end
+
+  def test_interrupt_avoids_object_allocations
+    @context.interrupt? # ruby 3.0.0 allocates on the first call
+    assert_no_object_allocations do
+      @context.interrupt?
+    end
+  end
+
+  def test_context_initialization_with_a_proc_in_environment
+    contx = Context.new([test: ->(c) { c['poutine'] }], test: :foo)
+
+    assert(contx)
+    assert_nil(contx['poutine'])
+  end
+
+  def test_apply_global_filter
+    global_filter_proc = ->(output) { "#{output} filtered" }
+
+    context = Context.new
+    context.global_filter = global_filter_proc
+
+    assert_equal('hi filtered', context.apply_global_filter('hi'))
+  end
+
+  def test_static_environments_are_read_with_lower_priority_than_environments
+    context = Context.build(
+      static_environments: { 'shadowed' => 'static', 'unshadowed' => 'static' },
+      environments: { 'shadowed' => 'dynamic' }
+    )
+
+    assert_equal('dynamic', context['shadowed'])
+    assert_equal('static', context['unshadowed'])
+  end
+
+  def test_apply_global_filter_when_no_global_filter_exist
+    context = Context.new
+    assert_equal('hi', context.apply_global_filter('hi'))
+  end
+
+  def test_new_isolated_subcontext_does_not_inherit_variables
+    super_context = Context.new
+    super_context['my_variable'] = 'some value'
+    subcontext = super_context.new_isolated_subcontext
+
+    assert_nil(subcontext['my_variable'])
+  end
+
+  def test_new_isolated_subcontext_inherits_static_environment
+    super_context = Context.build(static_environments: { 'my_environment_value' => 'my value' })
+    subcontext    = super_context.new_isolated_subcontext
+
+    assert_equal('my value', subcontext['my_environment_value'])
+  end
+
+  def test_new_isolated_subcontext_inherits_resource_limits
+    resource_limits = ResourceLimits.new({})
+    super_context   = Context.new({}, {}, {}, false, resource_limits)
+    subcontext      = super_context.new_isolated_subcontext
+    assert_equal(resource_limits, subcontext.resource_limits)
+  end
+
+  def test_new_isolated_subcontext_inherits_exception_renderer
+    super_context = Context.new
+    super_context.exception_renderer = ->(_e) { 'my exception message' }
+    subcontext = super_context.new_isolated_subcontext
+    assert_equal('my exception message', subcontext.handle_error(Liquid::Error.new))
+  end
+
+  def test_new_isolated_subcontext_does_not_inherit_non_static_registers
+    registers = {
+      my_register: :my_value,
+    }
+    super_context = Context.new({}, {}, StaticRegisters.new(registers))
+    super_context.registers[:my_register] = :my_alt_value
+    subcontext                            = super_context.new_isolated_subcontext
+    assert_equal(:my_value, subcontext.registers[:my_register])
+  end
+
+  def test_new_isolated_subcontext_inherits_static_registers
+    super_context = Context.build(registers: { my_register: :my_value })
+    subcontext    = super_context.new_isolated_subcontext
+    assert_equal(:my_value, subcontext.registers[:my_register])
+  end
+
+  def test_new_isolated_subcontext_registers_do_not_pollute_context
+    super_context                      = Context.build(registers: { my_register: :my_value })
+    subcontext                         = super_context.new_isolated_subcontext
+    subcontext.registers[:my_register] = :my_alt_value
+    assert_equal(:my_value, super_context.registers[:my_register])
+  end
+
+  def test_new_isolated_subcontext_inherits_filters
+    my_filter = Module.new do
+      def my_filter(*)
+        'my filter result'
+      end
+    end
+
+    super_context = Context.new
+    super_context.add_filters([my_filter])
+    subcontext    = super_context.new_isolated_subcontext
+    template      = Template.parse('{{ 123 | my_filter }}')
+    assert_equal('my filter result', template.render(subcontext))
+  end
+
+  def test_disables_tag_specified
+    context = Context.new
+    context.with_disabled_tags(%w(foo bar)) do
+      assert_equal(true, context.tag_disabled?("foo"))
+      assert_equal(true, context.tag_disabled?("bar"))
+      assert_equal(false, context.tag_disabled?("unknown"))
+    end
+  end
+
+  def test_disables_nested_tags
+    context = Context.new
+    context.with_disabled_tags(["foo"]) do
+      context.with_disabled_tags(["foo"]) do
+        assert_equal(true, context.tag_disabled?("foo"))
+        assert_equal(false, context.tag_disabled?("bar"))
+      end
+      context.with_disabled_tags(["bar"]) do
+        assert_equal(true, context.tag_disabled?("foo"))
+        assert_equal(true, context.tag_disabled?("bar"))
+        context.with_disabled_tags(["foo"]) do
+          assert_equal(true, context.tag_disabled?("foo"))
+          assert_equal(true, context.tag_disabled?("bar"))
+        end
+      end
+      assert_equal(true, context.tag_disabled?("foo"))
+      assert_equal(false, context.tag_disabled?("bar"))
+    end
+  end
+
   def test_override_global_filter
     global = Module.new do
       def notice(output)
@@ -19,16 +607,30 @@ class ContextTest < Minitest::Test
     end
 
     with_global_filter(global) do
-      assert_equal 'Global test', Template.parse("{{'test' | notice }}").render!
-      assert_equal 'Local test', Template.parse("{{'test' | notice }}").render!({}, filters: [local])
+      assert_equal('Global test', Template.parse("{{'test' | notice }}").render!)
+      assert_equal('Local test', Template.parse("{{'test' | notice }}").render!({}, filters: [local]))
     end
   end
 
   def test_has_key_will_not_add_an_error_for_missing_keys
-    with_error_mode :strict do
+    with_error_mode(:strict) do
       context = Context.new
       context.key?('unknown')
-      assert_empty context.errors
+      assert_empty(context.errors)
     end
   end
-end
+
+  private
+
+  def assert_no_object_allocations
+    unless RUBY_ENGINE == 'ruby'
+      skip("stackprof needed to count object allocations")
+    end
+    require 'stackprof'
+
+    profile = StackProf.run(mode: :object) do
+      yield
+    end
+    assert_equal(0, profile[:samples])
+  end
+end # ContextTest

test/integration/drop_test.rb

@@ -49,10 +49,6 @@ class ProductDrop < Liquid::Drop
     ContextDrop.new
   end
 
-  def user_input
-    (+"foo").taint
-  end
-
   protected
 
   def callmenot
@@ -114,32 +110,6 @@ class DropsTest < Minitest::Test
     assert_equal('  ', tpl.render!('product' => ProductDrop.new))
   end
 
-  def test_rendering_raises_on_tainted_attr
-    with_taint_mode(:error) do
-      tpl = Liquid::Template.parse('{{ product.user_input }}')
-      assert_raises TaintedError do
-        tpl.render!('product' => ProductDrop.new)
-      end
-    end
-  end
-
-  def test_rendering_warns_on_tainted_attr
-    with_taint_mode(:warn) do
-      tpl     = Liquid::Template.parse('{{ product.user_input }}')
-      context = Context.new('product' => ProductDrop.new)
-      tpl.render!(context)
-      assert_equal [Liquid::TaintedError], context.warnings.map(&:class)
-      assert_equal "variable 'product.user_input' is tainted and was not escaped", context.warnings.first.to_s(false)
-    end
-  end
-
-  def test_rendering_doesnt_raise_on_escaped_tainted_attr
-    with_taint_mode(:error) do
-      tpl = Liquid::Template.parse('{{ product.user_input | escape }}')
-      tpl.render!('product' => ProductDrop.new)
-    end
-  end
-
   def test_drop_does_only_respond_to_whitelisted_methods
     assert_equal("", Liquid::Template.parse("{{ product.inspect }}").render!('product' => ProductDrop.new))
     assert_equal("", Liquid::Template.parse("{{ product.pretty_inspect }}").render!('product' => ProductDrop.new))
@@ -197,7 +167,7 @@ class DropsTest < Minitest::Test
   def test_object_methods_not_allowed
     [:dup, :clone, :singleton_class, :eval, :class_eval, :inspect].each do |method|
       output = Liquid::Template.parse(" {{ product.#{method} }} ").render!('product' => ProductDrop.new)
-      assert_equal '  ', output
+      assert_equal('  ', output)
     end
   end
 
@@ -240,28 +210,28 @@ class DropsTest < Minitest::Test
 
   def test_enumerable_drop_will_invoke_liquid_method_missing_for_clashing_method_names
     ["select", "each", "map", "cycle"].each do |method|
-      assert_equal method.to_s, Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => EnumerableDrop.new)
-      assert_equal method.to_s, Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => EnumerableDrop.new)
-      assert_equal method.to_s, Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => RealEnumerableDrop.new)
-      assert_equal method.to_s, Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => RealEnumerableDrop.new)
+      assert_equal(method.to_s, Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => EnumerableDrop.new))
+      assert_equal(method.to_s, Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => EnumerableDrop.new))
+      assert_equal(method.to_s, Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => RealEnumerableDrop.new))
+      assert_equal(method.to_s, Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => RealEnumerableDrop.new))
     end
   end
 
   def test_some_enumerable_methods_still_get_invoked
     [:count, :max].each do |method|
-      assert_equal "3", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => RealEnumerableDrop.new)
-      assert_equal "3", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => RealEnumerableDrop.new)
-      assert_equal "3", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => EnumerableDrop.new)
-      assert_equal "3", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => EnumerableDrop.new)
+      assert_equal("3", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => RealEnumerableDrop.new))
+      assert_equal("3", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => RealEnumerableDrop.new))
+      assert_equal("3", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => EnumerableDrop.new))
+      assert_equal("3", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => EnumerableDrop.new))
     end
 
     assert_equal("yes", Liquid::Template.parse("{% if collection contains 3 %}yes{% endif %}").render!('collection' => RealEnumerableDrop.new))
 
     [:min, :first].each do |method|
-      assert_equal "1", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => RealEnumerableDrop.new)
-      assert_equal "1", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => RealEnumerableDrop.new)
-      assert_equal "1", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => EnumerableDrop.new)
-      assert_equal "1", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => EnumerableDrop.new)
+      assert_equal("1", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => RealEnumerableDrop.new))
+      assert_equal("1", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => RealEnumerableDrop.new))
+      assert_equal("1", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => EnumerableDrop.new))
+      assert_equal("1", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => EnumerableDrop.new))
     end
   end
 
@@ -279,7 +249,7 @@ class DropsTest < Minitest::Test
   end
 
   def test_invokable_methods
-    assert_equal(%w(to_liquid catchall user_input context texts).to_set, ProductDrop.invokable_methods)
+    assert_equal(%w(to_liquid catchall context texts).to_set, ProductDrop.invokable_methods)
     assert_equal(%w(to_liquid scopes_as_array loop_pos scopes).to_set, ContextDrop.invokable_methods)
     assert_equal(%w(to_liquid size max min first count).to_set, EnumerableDrop.invokable_methods)
     assert_equal(%w(to_liquid max min sort count first).to_set, RealEnumerableDrop.invokable_methods)

test/integration/error_handling_test.rb

@@ -193,7 +193,7 @@ class ErrorHandlingTest < Minitest::Test
 
   # Liquid should not catch Exceptions that are not subclasses of StandardError, like Interrupt and NoMemoryError
   def test_exceptions_propagate
-    assert_raises Exception do
+    assert_raises(Exception) do
       template = Liquid::Template.parse('{{ errors.exception }}')
       template.render('errors' => ErrorDrop.new)
     end
@@ -261,4 +261,12 @@ class ErrorHandlingTest < Minitest::Test
     assert_equal("Argument error:\nLiquid error (product line 1): argument error", page)
     assert_equal("product", template.errors.first.template_name)
   end
+
+  def test_bug_compatible_silencing_of_errors_in_blank_nodes
+    output = Liquid::Template.parse("{% assign x = 0 %}{% if 1 < '2' %}not blank{% assign x = 3 %}{% endif %}{{ x }}").render
+    assert_equal("Liquid error: comparison of Integer with String failed0", output)
+
+    output = Liquid::Template.parse("{% assign x = 0 %}{% if 1 < '2' %}{% assign x = 3 %}{% endif %}{{ x }}").render
+    assert_equal("0", output)
+  end
 end

test/integration/expression_test.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class ExpressionTest < Minitest::Test
+  def test_keyword_literals
+    assert_equal(true, parse_and_eval("true"))
+    assert_equal(true, parse_and_eval(" true "))
+  end
+
+  def test_string
+    assert_equal("single quoted", parse_and_eval("'single quoted'"))
+    assert_equal("double quoted", parse_and_eval('"double quoted"'))
+    assert_equal("spaced", parse_and_eval(" 'spaced' "))
+    assert_equal("spaced2", parse_and_eval(' "spaced2" '))
+  end
+
+  def test_int
+    assert_equal(123, parse_and_eval("123"))
+    assert_equal(456, parse_and_eval(" 456 "))
+    assert_equal(12, parse_and_eval("012"))
+  end
+
+  def test_float
+    assert_equal(1.5, parse_and_eval("1.5"))
+    assert_equal(2.5, parse_and_eval(" 2.5 "))
+  end
+
+  def test_range
+    assert_equal(1..2, parse_and_eval("(1..2)"))
+    assert_equal(3..4, parse_and_eval(" ( 3 .. 4 ) "))
+  end
+
+  private
+
+  def parse_and_eval(markup, **assigns)
+    if Liquid::Template.error_mode == :strict
+      p = Liquid::Parser.new(markup)
+      markup = p.expression
+      p.consume(:end_of_string)
+    end
+    expression = Liquid::Expression.parse(markup)
+    context = Liquid::Context.new(assigns)
+    context.evaluate(expression)
+  end
+end

test/integration/filter_test.rb

@@ -153,6 +153,15 @@ class FiltersTest < Minitest::Test
     # tap still treated as a non-existent filter
     assert_equal("1000", Template.parse("{{var | tap}}").render!('var' => 1000))
   end
+
+  def test_liquid_argument_error
+    source = "{{ '' | size: 'too many args' }}"
+    exc = assert_raises(Liquid::ArgumentError) do
+      Template.parse(source).render!
+    end
+    assert_match(/\ALiquid error: wrong number of arguments /, exc.message)
+    assert_equal(exc.message, Template.parse(source).render)
+  end
 end
 
 class FiltersInTemplate < Minitest::Test
@@ -160,9 +169,9 @@ class FiltersInTemplate < Minitest::Test
 
   def test_local_global
     with_global_filter(MoneyFilter) do
-      assert_equal " 1000$ ", Template.parse("{{1000 | money}}").render!(nil, nil)
-      assert_equal " 1000$ CAD ", Template.parse("{{1000 | money}}").render!(nil, filters: CanadianMoneyFilter)
-      assert_equal " 1000$ CAD ", Template.parse("{{1000 | money}}").render!(nil, filters: [CanadianMoneyFilter])
+      assert_equal(" 1000$ ", Template.parse("{{1000 | money}}").render!(nil, nil))
+      assert_equal(" 1000$ CAD ", Template.parse("{{1000 | money}}").render!(nil, filters: CanadianMoneyFilter))
+      assert_equal(" 1000$ CAD ", Template.parse("{{1000 | money}}").render!(nil, filters: [CanadianMoneyFilter]))
     end
   end
 

test/integration/hash_ordering_test.rb

@@ -19,7 +19,7 @@ class HashOrderingTest < Minitest::Test
 
   def test_global_register_order
     with_global_filter(MoneyFilter, CanadianMoneyFilter) do
-      assert_equal " 1000$ CAD ", Template.parse("{{1000 | money}}").render(nil, nil)
+      assert_equal(" 1000$ CAD ", Template.parse("{{1000 | money}}").render(nil, nil))
     end
   end
 end

test/integration/parsing_quirks_test.rb

@@ -32,7 +32,7 @@ class ParsingQuirksTest < Minitest::Test
     assert(Template.parse("{{test}}"))
 
     with_error_mode(:lax) do
-      assert Template.parse("{{|test}}")
+      assert(Template.parse("{{|test}}"))
     end
 
     with_error_mode(:strict) do
@@ -118,6 +118,16 @@ class ParsingQuirksTest < Minitest::Test
     end
   end
 
+  def test_blank_variable_markup
+    assert_template_result('', "{{}}")
+  end
+
+  def test_lookup_on_var_with_literal_name
+    assigns = { "blank" => { "x" => "result" } }
+    assert_template_result('result', "{{ blank.x }}", assigns)
+    assert_template_result('result', "{{ blank['x'] }}", assigns)
+  end
+
   def test_contains_in_id
     assert_template_result(' YES ', '{% if containsallshipments == true %} YES {% endif %}', 'containsallshipments' => true)
   end

test/integration/profiler_test.rb

@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class RenderProfilingTest < Minitest::Test
+class ProfilerTest < Minitest::Test
   include Liquid
 
   class ProfilingFileSystem
@@ -62,6 +62,17 @@ class RenderProfilingTest < Minitest::Test
     assert_equal(2, included_children[1].line_number)
   end
 
+  def test_profiling_render_tag
+    t = Template.parse("{% render 'a_template' %}", profile: true)
+    t.render!
+
+    render_children = t.profiler[0].children
+    render_children.each do |timing|
+      assert_equal('a_template', timing.partial)
+    end
+    assert_equal([1, 2], render_children.map(&:line_number))
+  end
+
   def test_profiling_times_the_rendering_of_tokens
     t = Template.parse("{% include 'a_template' %}", profile: true)
     t.render!
@@ -77,6 +88,37 @@ class RenderProfilingTest < Minitest::Test
     assert(t.profiler.total_render_time >= 0, "Total render time was not calculated")
   end
 
+  class SleepTag < Liquid::Tag
+    def initialize(tag_name, markup, parse_context)
+      super
+      @duration = Float(markup)
+    end
+
+    def render_to_output_buffer(_context, _output)
+      sleep(@duration)
+    end
+  end
+
+  def test_profiling_multiple_renders
+    with_custom_tag('sleep', SleepTag) do
+      context = Liquid::Context.new
+      t = Liquid::Template.parse("{% sleep 0.001 %}", profile: true)
+      context.template_name = 'index'
+      t.render!(context)
+      context.template_name = 'layout'
+      first_render_time = context.profiler.total_time
+      t.render!(context)
+
+      profiler = context.profiler
+      children = profiler.children
+      assert_operator(first_render_time, :>=, 0.001)
+      assert_operator(profiler.total_time, :>=, 0.001 + first_render_time)
+      assert_equal(["index", "layout"], children.map(&:template_name))
+      assert_equal([nil, nil], children.map(&:code))
+      assert_equal(profiler.total_time, children.map(&:total_time).reduce(&:+))
+    end
+  end
+
   def test_profiling_uses_include_to_mark_children
     t = Template.parse("{{ 'a string' | upcase }}\n{% include 'a_template' %}", profile: true)
     t.render!
@@ -91,7 +133,7 @@ class RenderProfilingTest < Minitest::Test
 
     include_node = t.profiler[1]
     include_node.children.each do |child|
-      assert_equal "a_template", child.partial
+      assert_equal("a_template", child.partial)
     end
   end
 
@@ -101,12 +143,12 @@ class RenderProfilingTest < Minitest::Test
 
     a_template = t.profiler[1]
     a_template.children.each do |child|
-      assert_equal "a_template", child.partial
+      assert_equal("a_template", child.partial)
     end
 
     b_template = t.profiler[2]
     b_template.children.each do |child|
-      assert_equal "b_template", child.partial
+      assert_equal("b_template", child.partial)
     end
   end
 
@@ -116,12 +158,12 @@ class RenderProfilingTest < Minitest::Test
 
     a_template1 = t.profiler[1]
     a_template1.children.each do |child|
-      assert_equal "a_template", child.partial
+      assert_equal("a_template", child.partial)
     end
 
     a_template2 = t.profiler[2]
     a_template2.children.each do |child|
-      assert_equal "a_template", child.partial
+      assert_equal("a_template", child.partial)
     end
   end
 
@@ -159,13 +201,13 @@ class RenderProfilingTest < Minitest::Test
     t.render!("collection" => ["one", "two"])
     leaf = t.profiler[0].children[0]
 
-    assert_operator leaf.self_time, :>, 0
+    assert_operator(leaf.self_time, :>, 0)
   end
 
   def test_profiling_supports_total_time
     t = Template.parse("{% if true %} {% increment test %} {{ test }} {% endif %}", profile: true)
     t.render!
 
-    assert_operator t.profiler[0].total_time, :>, 0
+    assert_operator(t.profiler[0].total_time, :>, 0)
   end
 end

test/integration/registers/disabled_tags_test.rb

@@ -1,27 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class DisabledTagsTest < Minitest::Test
-  include Liquid
-
-  class DisableRaw < Block
-    disable_tags "raw"
-  end
-
-  class DisableRawEcho < Block
-    disable_tags "raw", "echo"
-  end
-
-  def test_disables_raw
-    with_custom_tag('disable', DisableRaw) do
-      assert_template_result 'raw usage is not allowed in this contextfoo', '{% disable %}{% raw %}Foobar{% endraw %}{% echo "foo" %}{% enddisable %}'
-    end
-  end
-
-  def test_disables_echo_and_raw
-    with_custom_tag('disable', DisableRawEcho) do
-      assert_template_result 'raw usage is not allowed in this contextecho usage is not allowed in this context', '{% disable %}{% raw %}Foobar{% endraw %}{% echo "foo" %}{% enddisable %}'
-    end
-  end
-end

test/integration/security_test.rb

@@ -43,15 +43,22 @@ class SecurityTest < Minitest::Test
     assert_equal(expected, Template.parse(text).render!(@assigns, filters: SecurityFilter))
   end
 
-  def test_does_not_add_filters_to_symbol_table
+  def test_does_not_permanently_add_filters_to_symbol_table
     current_symbols = Symbol.all_symbols
 
-    test = %( {{ "some_string" | a_bad_filter }} )
+    # MRI imprecisely marks objects found on the C stack, which can result
+    # in uninitialized memory being marked. This can even result in the test failing
+    # deterministically for a given compilation of ruby. Using a separate thread will
+    # keep these writes of the symbol pointer on a separate stack that will be garbage
+    # collected after Thread#join.
+    Thread.new do
+      test = %( {{ "some_string" | a_bad_filter }} )
+      Template.parse(test).render!
+      nil
+    end.join
 
-    template = Template.parse(test)
-    assert_equal([], (Symbol.all_symbols - current_symbols))
+    GC.start
 
-    template.render!
     assert_equal([], (Symbol.all_symbols - current_symbols))
   end
 

test/integration/standard_filter_test.rb

@@ -159,7 +159,7 @@ class StandardFiltersTest < Minitest::Test
     assert_equal('1', @filters.url_decode(1))
     assert_equal('2001-02-03', @filters.url_decode(Date.new(2001, 2, 3)))
     assert_nil(@filters.url_decode(nil))
-    exception = assert_raises Liquid::ArgumentError do
+    exception = assert_raises(Liquid::ArgumentError) do
       @filters.url_decode('%ff')
     end
     assert_equal('Liquid error: invalid byte sequence in UTF-8', exception.message)
@@ -175,6 +175,9 @@ class StandardFiltersTest < Minitest::Test
     )
     assert_equal("测试测试测试测试", @filters.truncatewords('测试测试测试测试', 5))
     assert_equal('one two1', @filters.truncatewords("one two three", 2, 1))
+    assert_equal('one two three...', @filters.truncatewords("one  two\tthree\nfour", 3))
+    assert_equal('one two...', @filters.truncatewords("one two three four", 2))
+    assert_equal('one...', @filters.truncatewords("one two three four", 0))
   end
 
   def test_strip_html
@@ -286,7 +289,7 @@ class StandardFiltersTest < Minitest::Test
       [3],
     ]
 
-    assert_raises Liquid::ArgumentError do
+    assert_raises(Liquid::ArgumentError) do
       @filters.sort(foo, "bar")
     end
   end
@@ -302,7 +305,7 @@ class StandardFiltersTest < Minitest::Test
       [3],
     ]
 
-    assert_raises Liquid::ArgumentError do
+    assert_raises(Liquid::ArgumentError) do
       @filters.sort_natural(foo, "bar")
     end
   end
@@ -337,7 +340,7 @@ class StandardFiltersTest < Minitest::Test
       [3],
     ]
 
-    assert_raises Liquid::ArgumentError do
+    assert_raises(Liquid::ArgumentError) do
       @filters.uniq(foo, "bar")
     end
   end
@@ -353,7 +356,7 @@ class StandardFiltersTest < Minitest::Test
       [3],
     ]
 
-    assert_raises Liquid::ArgumentError do
+    assert_raises(Liquid::ArgumentError) do
       @filters.compact(foo, "bar")
     end
   end
@@ -430,7 +433,7 @@ class StandardFiltersTest < Minitest::Test
       [3],
     ]
 
-    assert_raises Liquid::ArgumentError do
+    assert_raises(Liquid::ArgumentError) do
       @filters.map(foo, "bar")
     end
   end
@@ -441,7 +444,7 @@ class StandardFiltersTest < Minitest::Test
       [2],
       [3],
     ]
-    assert_raises Liquid::ArgumentError do
+    assert_raises(Liquid::ArgumentError) do
       @filters.map(foo, nil)
     end
   end
@@ -485,8 +488,8 @@ class StandardFiltersTest < Minitest::Test
     assert_equal('', @filters.date('', "%B"))
 
     with_timezone("UTC") do
-      assert_equal "07/05/2006", @filters.date(1152098955, "%m/%d/%Y")
-      assert_equal "07/05/2006", @filters.date("1152098955", "%m/%d/%Y")
+      assert_equal("07/05/2006", @filters.date(1152098955, "%m/%d/%Y"))
+      assert_equal("07/05/2006", @filters.date("1152098955", "%m/%d/%Y"))
     end
   end
 
@@ -539,6 +542,7 @@ class StandardFiltersTest < Minitest::Test
 
   def test_newlines_to_br
     assert_template_result("a<br />\nb<br />\nc", "{{ source | newline_to_br }}", 'source' => "a\nb\nc")
+    assert_template_result("a<br />\nb<br />\nc", "{{ source | newline_to_br }}", 'source' => "a\r\nb\nc")
   end
 
   def test_plus
@@ -587,7 +591,7 @@ class StandardFiltersTest < Minitest::Test
 
     assert_template_result("0.5", "{{ 2.0 | divided_by:4 }}")
     assert_raises(Liquid::ZeroDivisionError) do
-      assert_template_result "4", "{{ 1 | modulo: 0 }}"
+      assert_template_result("4", "{{ 1 | modulo: 0 }}")
     end
 
     assert_template_result("5", "{{ price | divided_by:2 }}", 'price' => NumberLikeThing.new(10))
@@ -596,7 +600,7 @@ class StandardFiltersTest < Minitest::Test
   def test_modulo
     assert_template_result("1", "{{ 3 | modulo:2 }}")
     assert_raises(Liquid::ZeroDivisionError) do
-      assert_template_result "4", "{{ 1 | modulo: 0 }}"
+      assert_template_result("4", "{{ 1 | modulo: 0 }}")
     end
 
     assert_template_result("1", "{{ price | modulo:2 }}", 'price' => NumberLikeThing.new(3))
@@ -607,7 +611,7 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result("4", "{{ '4.3' | round }}")
     assert_template_result("4.56", "{{ input | round: 2 }}", 'input' => 4.5612)
     assert_raises(Liquid::FloatDomainError) do
-      assert_template_result "4", "{{ 1.0 | divided_by: 0.0 | round }}"
+      assert_template_result("4", "{{ 1.0 | divided_by: 0.0 | round }}")
     end
 
     assert_template_result("5", "{{ price | round }}", 'price' => NumberLikeThing.new(4.6))
@@ -618,7 +622,7 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result("5", "{{ input | ceil }}", 'input' => 4.6)
     assert_template_result("5", "{{ '4.3' | ceil }}")
     assert_raises(Liquid::FloatDomainError) do
-      assert_template_result "4", "{{ 1.0 | divided_by: 0.0 | ceil }}"
+      assert_template_result("4", "{{ 1.0 | divided_by: 0.0 | ceil }}")
     end
 
     assert_template_result("5", "{{ price | ceil }}", 'price' => NumberLikeThing.new(4.6))
@@ -628,7 +632,7 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result("4", "{{ input | floor }}", 'input' => 4.6)
     assert_template_result("4", "{{ '4.3' | floor }}")
     assert_raises(Liquid::FloatDomainError) do
-      assert_template_result "4", "{{ 1.0 | divided_by: 0.0 | floor }}"
+      assert_template_result("4", "{{ 1.0 | divided_by: 0.0 | floor }}")
     end
 
     assert_template_result("5", "{{ price | floor }}", 'price' => NumberLikeThing.new(5.4))
@@ -768,6 +772,49 @@ class StandardFiltersTest < Minitest::Test
     assert_nil(@filters.where([nil], "ok"))
   end
 
+  def test_all_filters_never_raise_non_liquid_exception
+    test_drop = TestDrop.new
+    test_drop.context = Context.new
+    test_enum = TestEnumerable.new
+    test_enum.context = Context.new
+    test_types = [
+      "foo",
+      123,
+      0,
+      0.0,
+      -1234.003030303,
+      -99999999,
+      1234.38383000383830003838300,
+      nil,
+      true,
+      false,
+      TestThing.new,
+      test_drop,
+      test_enum,
+      ["foo", "bar"],
+      { "foo" => "bar" },
+      { foo: "bar" },
+      [{ "foo" => "bar" }, { "foo" => 123 }, { "foo" => nil }, { "foo" => true }, { "foo" => ["foo", "bar"] }],
+      { 1 => "bar" },
+      ["foo", 123, nil, true, false, Drop, ["foo"], { foo: "bar" }],
+    ]
+    test_types.each do |first|
+      test_types.each do |other|
+        (@filters.methods - Object.methods).each do |method|
+          arg_count = @filters.method(method).arity
+          arg_count *= -1 if arg_count < 0
+          inputs = [first]
+          inputs << ([other] * (arg_count - 1)) if arg_count > 1
+          begin
+            @filters.send(method, *inputs)
+          rescue Liquid::ArgumentError, Liquid::ZeroDivisionError
+            nil
+          end
+        end
+      end
+    end
+  end
+
   def test_where_no_target_value
     input = [
       { "foo" => false },

test/integration/tag/disableable_test.rb

@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class TagDisableableTest < Minitest::Test
+  include Liquid
+
+  module RenderTagName
+    def render(_context)
+      tag_name
+    end
+  end
+
+  class Custom < Tag
+    prepend Liquid::Tag::Disableable
+    include RenderTagName
+  end
+
+  class Custom2 < Tag
+    prepend Liquid::Tag::Disableable
+    include RenderTagName
+  end
+
+  class DisableCustom < Block
+    disable_tags "custom"
+  end
+
+  class DisableBoth < Block
+    disable_tags "custom", "custom2"
+  end
+
+  def test_block_tag_disabling_nested_tag
+    with_disableable_tags do
+      with_custom_tag('disable', DisableCustom) do
+        output = Template.parse('{% disable %}{% custom %};{% custom2 %}{% enddisable %}').render
+        assert_equal('Liquid error: custom usage is not allowed in this context;custom2', output)
+      end
+    end
+  end
+
+  def test_block_tag_disabling_multiple_nested_tags
+    with_disableable_tags do
+      with_custom_tag('disable', DisableBoth) do
+        output = Template.parse('{% disable %}{% custom %};{% custom2 %}{% enddisable %}').render
+        assert_equal('Liquid error: custom usage is not allowed in this context;Liquid error: custom2 usage is not allowed in this context', output)
+      end
+    end
+  end
+
+  private
+
+  def with_disableable_tags
+    with_custom_tag('custom', Custom) do
+      with_custom_tag('custom2', Custom2) do
+        yield
+      end
+    end
+  end
+end

test/integration/tag_test.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class TagTest < Minitest::Test
+  include Liquid
+
+  def test_custom_tags_have_a_default_render_to_output_buffer_method_for_backwards_compatibility
+    klass1 = Class.new(Tag) do
+      def render(*)
+        'hello'
+      end
+    end
+
+    with_custom_tag('blabla', klass1) do
+      template = Liquid::Template.parse("{% blabla %}")
+
+      assert_equal('hello', template.render)
+
+      buf    = +''
+      output = template.render({}, output: buf)
+      assert_equal('hello', output)
+      assert_equal('hello', buf)
+      assert_equal(buf.object_id, output.object_id)
+    end
+
+    klass2 = Class.new(klass1) do
+      def render(*)
+        'foo' + super + 'bar'
+      end
+    end
+
+    with_custom_tag('blabla', klass2) do
+      template = Liquid::Template.parse("{% blabla %}")
+
+      assert_equal('foohellobar', template.render)
+
+      buf    = +''
+      output = template.render({}, output: buf)
+      assert_equal('foohellobar', output)
+      assert_equal('foohellobar', buf)
+      assert_equal(buf.object_id, output.object_id)
+    end
+  end
+end

test/integration/tags/for_tag_test.rb

@@ -437,4 +437,30 @@ HERE
 
     assert(context.registers[:for_stack].empty?)
   end
+
+  def test_instrument_for_offset_continue
+    assert_usage_increment('for_offset_continue') do
+      Template.parse('{% for item in items offset:continue %}{{item}}{% endfor %}')
+    end
+
+    assert_usage_increment('for_offset_continue', times: 0) do
+      Template.parse('{% for item in items offset:2 %}{{item}}{% endfor %}')
+    end
+  end
+
+  def test_instrument_forloop_drop_name
+    assigns = { 'items' => [1, 2, 3, 4, 5] }
+
+    assert_usage_increment('forloop_drop_name', times: 5) do
+      Template.parse('{% for item in items %}{{forloop.name}}{% endfor %}').render!(assigns)
+    end
+
+    assert_usage_increment('forloop_drop_name', times: 0) do
+      Template.parse('{% for item in items %}{{forloop.index}}{% endfor %}').render!(assigns)
+    end
+
+    assert_usage_increment('forloop_drop_name', times: 0) do
+      Template.parse('{% for item in items %}{{item}}{% endfor %}').render!(assigns)
+    end
+  end
 end

test/integration/tags/if_else_tag_test.rb

@@ -184,7 +184,7 @@ class IfElseTagTest < Minitest::Test
     tests.each do |vals, expected|
       a, b, c = vals
       assigns = { 'a' => a, 'b' => b, 'c' => c }
-      assert_template_result expected.to_s, tpl, assigns, assigns.to_s
+      assert_template_result(expected.to_s, tpl, assigns, assigns.to_s)
     end
   end
 end

test/integration/tags/include_tag_test.rb

@@ -226,13 +226,13 @@ class IncludeTagTest < Minitest::Test
       Template.parse("{% include template %}", error_mode: :strict).render!("template" => '{{ "X" || downcase }}')
     end
     with_error_mode(:lax) do
-      assert_equal 'x', Template.parse("{% include template %}", error_mode: :strict, include_options_blacklist: true).render!("template" => '{{ "X" || downcase }}')
+      assert_equal('x', Template.parse("{% include template %}", error_mode: :strict, include_options_blacklist: true).render!("template" => '{{ "X" || downcase }}'))
     end
     assert_raises(Liquid::SyntaxError) do
       Template.parse("{% include template %}", error_mode: :strict, include_options_blacklist: [:locale]).render!("template" => '{{ "X" || downcase }}')
     end
     with_error_mode(:lax) do
-      assert_equal 'x', Template.parse("{% include template %}", error_mode: :strict, include_options_blacklist: [:error_mode]).render!("template" => '{{ "X" || downcase }}')
+      assert_equal('x', Template.parse("{% include template %}", error_mode: :strict, include_options_blacklist: [:error_mode]).render!("template" => '{{ "X" || downcase }}'))
     end
   end
 

test/integration/tags/inline_comment_test.rb

@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class InlineCommentTest < Minitest::Test
+  include Liquid
+
+  def test_tag_in_different_styles
+    assert_template_result('', '{% # This text gets ignored %}')
+    assert_template_result('', '{%# This text gets ignored #%}')
+    assert_template_result('', '{%# This text gets ignored %}')
+    assert_template_result('', '{%#- This text gets ignored -#%}')
+  end
+
+  def test_test_syntax_error
+    assert_template_result('fail', '{% #This doesnt work %}')
+
+    assert false 
+  rescue 
+    # ok good
+  end
+
+  def test_tag_ws_stripping
+    assert_template_result('', '   {%#- This text gets ignored -#%}    ')
+  end
+
+  def test_comment_inline_tag
+    assert_template_result('ok', '{% echo "ok" # output something from a tag %}')
+  end
+
+  def test_comment_line_before_tag
+    assert_template_result('ok', '{% # this sort of comment also
+      echo "ok" %}')
+  end
+
+  def test_comment_inline_variable
+    assert_template_result('ok', '{{ "ok" # output something from a variable }}')
+    assert_template_result('ok', '{{ "OK" | downcase # output something from a variable }}')
+  end
+
+  def test_inside_liquid_tag
+    source = <<~LIQUID
+      {%- liquid
+        echo "before("
+        # This text gets ignored
+        echo ")after"
+      -%}
+    LIQUID
+    assert_template_result('before()after', source)
+  end
+
+  def test_multiline
+    assert_template_result('', '{% # this sort of comment also
+      # will just work, because it parses
+      # as a single call to the "#" tag %}')   
+
+  end
+
+end

test/integration/tags/liquid_tag_test.rb

@@ -81,6 +81,16 @@ class LiquidTagTest < Minitest::Test
     assert_match_syntax_error("syntax error (line 3): Unknown tag 'error'", "{% liquid echo ''\n  \n error %}")
   end
 
+  def test_nested_liquid_tag
+    assert_template_result('good', <<~LIQUID)
+      {%- if true %}
+        {%- liquid
+          echo "good"
+        %}
+      {%- endif -%}
+    LIQUID
+  end
+
   def test_cannot_open_blocks_living_past_a_liquid_tag
     assert_match_syntax_error("syntax error (line 3): 'if' tag was never closed", <<~LIQUID)
       {%- liquid
@@ -90,8 +100,8 @@ class LiquidTagTest < Minitest::Test
     LIQUID
   end
 
-  def test_quirk_can_close_blocks_created_before_a_liquid_tag
-    assert_template_result("42", <<~LIQUID)
+  def test_cannot_close_blocks_created_before_a_liquid_tag
+    assert_match_syntax_error("syntax error (line 3): 'endif' is not a valid delimiter for liquid tags. use %}", <<~LIQUID)
       {%- if true -%}
       42
       {%- liquid endif -%}

test/integration/tags/raw_tag_test.rb

@@ -23,6 +23,7 @@ class RawTagTest < Minitest::Test
     assert_template_result(' Foobar {% {% {% ', '{% raw %} Foobar {% {% {% {% endraw %}')
     assert_template_result(' test {% raw %} {% endraw %}', '{% raw %} test {% raw %} {% {% endraw %}endraw %}')
     assert_template_result(' Foobar {{ invalid 1', '{% raw %} Foobar {{ invalid {% endraw %}{{ 1 }}')
+    assert_template_result(' Foobar {% foo {% bar %}', '{% raw %} Foobar {% foo {% bar %}{% endraw %}')
   end
 
   def test_invalid_raw

test/integration/tags/render_tag_test.rb

@@ -42,32 +42,6 @@ class RenderTagTest < Minitest::Test
     assert_template_result('', "{% assign snippet = 'should not be visible' %}{% render 'snippet' %}")
   end
 
-  def test_render_sets_the_correct_template_name_for_errors
-    Liquid::Template.file_system = StubFileSystem.new('snippet' => '{{ unsafe }}')
-
-    with_taint_mode :error do
-      template = Liquid::Template.parse('{% render "snippet", unsafe: unsafe %}')
-      context  = Context.new('unsafe' => (+'unsafe').tap(&:taint))
-      template.render(context)
-
-      assert_equal [Liquid::TaintedError], template.errors.map(&:class)
-      assert_equal 'snippet', template.errors.first.template_name
-    end
-  end
-
-  def test_render_sets_the_correct_template_name_for_warnings
-    Liquid::Template.file_system = StubFileSystem.new('snippet' => '{{ unsafe }}')
-
-    with_taint_mode :warn do
-      template = Liquid::Template.parse('{% render "snippet", unsafe: unsafe %}')
-      context  = Context.new('unsafe' => (+'unsafe').tap(&:taint))
-      template.render(context)
-
-      assert_equal [Liquid::TaintedError], context.warnings.map(&:class)
-      assert_equal 'snippet', context.warnings.first.template_name
-    end
-  end
-
   def test_render_does_not_mutate_parent_scope
     Liquid::Template.file_system = StubFileSystem.new('snippet' => '{% assign inner = 1 %}')
     assert_template_result('', "{% render 'snippet' %}{{ inner }}")
@@ -84,7 +58,7 @@ class RenderTagTest < Minitest::Test
   def test_recursively_rendered_template_does_not_produce_endless_loop
     Liquid::Template.file_system = StubFileSystem.new('loop' => '{% render "loop" %}')
 
-    assert_raises Liquid::StackLevelError do
+    assert_raises(Liquid::StackLevelError) do
       Template.parse('{% render "loop" %}').render!
     end
   end
@@ -93,7 +67,7 @@ class RenderTagTest < Minitest::Test
     Liquid::Template.file_system = StubFileSystem.new(
       'loop_render' => '{% render "loop_render" %}',
     )
-    assert_raises Liquid::StackLevelError do
+    assert_raises(Liquid::StackLevelError) do
       Template.parse('{% render "loop_render" %}').render!
     end
   end
@@ -101,7 +75,7 @@ class RenderTagTest < Minitest::Test
   def test_dynamically_choosen_templates_are_not_allowed
     Liquid::Template.file_system = StubFileSystem.new('snippet' => 'should not be rendered')
 
-    assert_raises Liquid::SyntaxError do
+    assert_raises(Liquid::SyntaxError) do
       Liquid::Template.parse("{% assign name = 'snippet' %}{% render name %}")
     end
   end
@@ -153,7 +127,10 @@ class RenderTagTest < Minitest::Test
       'test_include' => '{% include "foo" %}'
     )
 
-    assert_template_result('include usage is not allowed in this context', '{% render "test_include" %}')
+    exc = assert_raises(Liquid::DisabledError) do
+      Liquid::Template.parse('{% render "test_include" %}').render!
+    end
+    assert_equal('Liquid error: include usage is not allowed in this context', exc.message)
   end
 
   def test_includes_will_not_render_inside_nested_sibling_tags
@@ -163,7 +140,8 @@ class RenderTagTest < Minitest::Test
       'test_include' => '{% include "foo" %}'
     )
 
-    assert_template_result('include usage is not allowed in this contextinclude usage is not allowed in this context', '{% render "nested_render_with_sibling_include" %}')
+    output = Liquid::Template.parse('{% render "nested_render_with_sibling_include" %}').render
+    assert_equal('Liquid error: include usage is not allowed in this contextLiquid error: include usage is not allowed in this context', output)
   end
 
   def test_render_tag_with

test/integration/tags/standard_tag_test.rb

@@ -213,6 +213,11 @@ class StandardTagTest < Minitest::Test
     assert_template_result('', code, 'condition' => 'something else')
   end
 
+  def test_case_when_comma_and_blank_body
+    code = '{% case condition %}{% when 1, 2 %} {% assign r = "result" %} {% endcase %}{{ r }}'
+    assert_template_result('result', code, 'condition' => 2)
+  end
+
   def test_assign
     assert_template_result('variable', '{% assign a = "variable"%}{{a}}')
   end

test/integration/template_test.rb

@@ -111,13 +111,12 @@ class TemplateTest < Minitest::Test
 
   def test_resource_limits_render_length
     t = Template.parse("0123456789")
-    t.resource_limits.render_length_limit = 5
+    t.resource_limits.render_length_limit = 9
     assert_equal("Liquid error: Memory limits exceeded", t.render)
     assert(t.resource_limits.reached?)
 
     t.resource_limits.render_length_limit = 10
     assert_equal("0123456789", t.render!)
-    refute_nil(t.resource_limits.render_length)
   end
 
   def test_resource_limits_render_score
@@ -136,38 +135,6 @@ class TemplateTest < Minitest::Test
     refute_nil(t.resource_limits.render_score)
   end
 
-  def test_resource_limits_assign_score
-    t = Template.parse("{% assign foo = 42 %}{% assign bar = 23 %}")
-    t.resource_limits.assign_score_limit = 1
-    assert_equal("Liquid error: Memory limits exceeded", t.render)
-    assert(t.resource_limits.reached?)
-
-    t.resource_limits.assign_score_limit = 2
-    assert_equal("", t.render!)
-    refute_nil(t.resource_limits.assign_score)
-  end
-
-  def test_resource_limits_assign_score_counts_bytes_not_characters
-    t = Template.parse("{% assign foo = 'すごい' %}")
-    t.render
-    assert_equal(9, t.resource_limits.assign_score)
-
-    t = Template.parse("{% capture foo %}すごい{% endcapture %}")
-    t.render
-    assert_equal(9, t.resource_limits.assign_score)
-  end
-
-  def test_resource_limits_assign_score_nested
-    t = Template.parse("{% assign foo = 'aaaa' | reverse %}")
-
-    t.resource_limits.assign_score_limit = 3
-    assert_equal("Liquid error: Memory limits exceeded", t.render)
-    assert(t.resource_limits.reached?)
-
-    t.resource_limits.assign_score_limit = 5
-    assert_equal("", t.render!)
-  end
-
   def test_resource_limits_aborts_rendering_after_first_error
     t = Template.parse("{% for a in (1..100) %} foo1 {% endfor %} bar {% for a in (1..100) %} foo2 {% endfor %}")
     t.resource_limits.render_score_limit = 50
@@ -176,50 +143,46 @@ class TemplateTest < Minitest::Test
   end
 
   def test_resource_limits_hash_in_template_gets_updated_even_if_no_limits_are_set
-    t = Template.parse("{% for a in (1..100) %} {% assign foo = 1 %} {% endfor %}")
+    t = Template.parse("{% for a in (1..100) %}x{% assign foo = 1 %} {% endfor %}")
     t.render!
     assert(t.resource_limits.assign_score > 0)
     assert(t.resource_limits.render_score > 0)
-    assert(t.resource_limits.render_length > 0)
   end
 
   def test_render_length_persists_between_blocks
     t = Template.parse("{% if true %}aaaa{% endif %}")
-    t.resource_limits.render_length_limit = 7
+    t.resource_limits.render_length_limit = 3
     assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 8
+    t.resource_limits.render_length_limit = 4
     assert_equal("aaaa", t.render)
 
     t = Template.parse("{% if true %}aaaa{% endif %}{% if true %}bbb{% endif %}")
-    t.resource_limits.render_length_limit = 13
+    t.resource_limits.render_length_limit = 6
     assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 14
+    t.resource_limits.render_length_limit = 7
     assert_equal("aaaabbb", t.render)
 
     t = Template.parse("{% if true %}a{% endif %}{% if true %}b{% endif %}{% if true %}a{% endif %}{% if true %}b{% endif %}{% if true %}a{% endif %}{% if true %}b{% endif %}")
     t.resource_limits.render_length_limit = 5
     assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 11
-    assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 12
+    t.resource_limits.render_length_limit = 6
     assert_equal("ababab", t.render)
   end
 
   def test_render_length_uses_number_of_bytes_not_characters
     t = Template.parse("{% if true %}すごい{% endif %}")
-    t.resource_limits.render_length_limit = 10
+    t.resource_limits.render_length_limit = 8
     assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 18
+    t.resource_limits.render_length_limit = 9
     assert_equal("すごい", t.render)
   end
 
   def test_default_resource_limits_unaffected_by_render_with_context
     context = Context.new
-    t = Template.parse("{% for a in (1..100) %} {% assign foo = 1 %} {% endfor %}")
+    t = Template.parse("{% for a in (1..100) %}x{% assign foo = 1 %} {% endfor %}")
     t.render!(context)
     assert(context.resource_limits.assign_score > 0)
     assert(context.resource_limits.render_score > 0)
-    assert(context.resource_limits.render_length > 0)
   end
 
   def test_can_use_drop_as_context
@@ -235,7 +198,7 @@ class TemplateTest < Minitest::Test
     context = Context.new('drop' => ErroneousDrop.new)
     t = Template.new.parse('{{ drop.bad_method }}')
 
-    e = assert_raises RuntimeError do
+    e = assert_raises(RuntimeError) do
       t.render!(context)
     end
     assert_equal('ruby error in drop', e.message)
@@ -294,9 +257,8 @@ class TemplateTest < Minitest::Test
   end
 
   def test_nil_value_does_not_raise
-    Liquid::Template.error_mode = :strict
-    t                           = Template.parse("some{{x}}thing")
-    result                      = t.render!({ 'x' => nil }, strict_variables: true)
+    t      = Template.parse("some{{x}}thing", error_mode: :strict)
+    result = t.render!({ 'x' => nil }, strict_variables: true)
 
     assert_equal(0, t.errors.count)
     assert_equal('something', result)
@@ -305,7 +267,7 @@ class TemplateTest < Minitest::Test
   def test_undefined_variables_raise
     t = Template.parse("{{x}} {{y}} {{z.a}} {{z.b}} {{z.c.d}}")
 
-    assert_raises UndefinedVariable do
+    assert_raises(UndefinedVariable) do
       t.render!({ 'x' => 33, 'z' => { 'a' => 32, 'c' => { 'e' => 31 } } }, strict_variables: true)
     end
   end
@@ -324,7 +286,7 @@ class TemplateTest < Minitest::Test
     d = DropWithUndefinedMethod.new
     t = Template.new.parse('{{ foo }} {{ woot }}')
 
-    assert_raises UndefinedDropMethod do
+    assert_raises(UndefinedDropMethod) do
       t.render!(d, strict_variables: true)
     end
   end
@@ -347,7 +309,7 @@ class TemplateTest < Minitest::Test
   def test_undefined_filters_raise
     t = Template.parse("{{x | somefilter1 | upcase | somefilter2}}")
 
-    assert_raises UndefinedFilter do
+    assert_raises(UndefinedFilter) do
       t.render!({ 'x' => 'foo' }, strict_filters: true)
     end
   end

test/integration/trim_mode_test.rb

@@ -528,4 +528,36 @@ class TrimModeTest < Minitest::Test
     END_EXPECTED
     assert_template_result(expected, text)
   end
+
+  def test_pre_trim_blank_preceding_text
+    template = Liquid::Template.parse("\n{%- raw %}{% endraw %}")
+    assert_equal("", template.render)
+
+    template = Liquid::Template.parse("\n{%- if true %}{% endif %}")
+    assert_equal("", template.render)
+
+    template = Liquid::Template.parse("{{ 'B' }} \n{%- if true %}C{% endif %}")
+    assert_equal("BC", template.render)
+  end
+
+  def test_bug_compatible_pre_trim
+    template = Liquid::Template.parse("\n {%- raw %}{% endraw %}", bug_compatible_whitespace_trimming: true)
+    assert_equal("\n", template.render)
+
+    template = Liquid::Template.parse("\n {%- if true %}{% endif %}", bug_compatible_whitespace_trimming: true)
+    assert_equal("\n", template.render)
+
+    template = Liquid::Template.parse("{{ 'B' }} \n{%- if true %}C{% endif %}", bug_compatible_whitespace_trimming: true)
+    assert_equal("B C", template.render)
+
+    template = Liquid::Template.parse("B\n {%- raw %}{% endraw %}", bug_compatible_whitespace_trimming: true)
+    assert_equal("B", template.render)
+
+    template = Liquid::Template.parse("B\n {%- if true %}{% endif %}", bug_compatible_whitespace_trimming: true)
+    assert_equal("B", template.render)
+  end
+
+  def test_trim_blank
+    assert_template_result('foobar', 'foo {{-}} bar')
+  end
 end # TrimModeTest

test/integration/variable_test.rb

@@ -21,6 +21,11 @@ class VariableTest < Minitest::Test
     assert_equal('  worked wonderfully  ', template.render!('test' => 'worked wonderfully'))
   end
 
+  def test_expression_with_whitespace_in_square_brackets
+    assert_template_result('result', "{{ a[ 'b' ] }}", 'a' => { 'b' => 'result' })
+    assert_template_result('result', "{{ a[ [ 'b' ] ] }}", 'b' => 'c', 'a' => { 'c' => 'result' })
+  end
+
   def test_ignore_unknown
     template = Template.parse(%({{ test }}))
     assert_equal('', template.render!)
@@ -37,8 +42,8 @@ class VariableTest < Minitest::Test
   end
 
   def test_hash_scoping
-    template = Template.parse(%({{ test.test }}))
-    assert_equal('worked', template.render!('test' => { 'test' => 'worked' }))
+    assert_template_result('worked', "{{ test.test }}", 'test' => { 'test' => 'worked' })
+    assert_template_result('worked', "{{ test . test }}", 'test' => { 'test' => 'worked' })
   end
 
   def test_false_renders_as_false
@@ -95,4 +100,8 @@ class VariableTest < Minitest::Test
   def test_render_symbol
     assert_template_result('bar', '{{ foo }}', 'foo' => :bar)
   end
+
+  def test_dynamic_find_var
+    assert_template_result('bar', '{{ [key] }}', 'key' => 'foo', 'foo' => 'bar')
+  end
 end

test/test_helper.rb

@@ -54,28 +54,39 @@ module Minitest
       assert_match(match, exception.message)
     end
 
+    def assert_usage_increment(name, times: 1)
+      old_method = Liquid::Usage.method(:increment)
+      calls = 0
+      begin
+        Liquid::Usage.singleton_class.send(:remove_method, :increment)
+        Liquid::Usage.define_singleton_method(:increment) do |got_name|
+          calls += 1 if got_name == name
+          old_method.call(got_name)
+        end
+        yield
+      ensure
+        Liquid::Usage.singleton_class.send(:remove_method, :increment)
+        Liquid::Usage.define_singleton_method(:increment, old_method)
+      end
+      assert_equal(times, calls, "Number of calls to Usage.increment with #{name.inspect}")
+    end
+
     def with_global_filter(*globals)
-      original_global_strainer = Liquid::Strainer.class_variable_get(:@@global_strainer)
-      Liquid::Strainer.class_variable_set(:@@global_strainer, Class.new(Liquid::Strainer) do
-        @filter_methods = Set.new
-      end)
-      Liquid::Strainer.class_variable_get(:@@strainer_class_cache).clear
+      original_global_filters = Liquid::StrainerFactory.instance_variable_get(:@global_filters)
+      Liquid::StrainerFactory.instance_variable_set(:@global_filters, [])
+      globals.each do |global|
+        Liquid::StrainerFactory.add_global_filter(global)
+      end
+
+      Liquid::StrainerFactory.send(:strainer_class_cache).clear
 
       globals.each do |global|
         Liquid::Template.register_filter(global)
       end
       yield
     ensure
-      Liquid::Strainer.class_variable_get(:@@strainer_class_cache).clear
-      Liquid::Strainer.class_variable_set(:@@global_strainer, original_global_strainer)
-    end
-
-    def with_taint_mode(mode)
-      old_mode = Liquid::Template.taint_mode
-      Liquid::Template.taint_mode = mode
-      yield
-    ensure
-      Liquid::Template.taint_mode = old_mode
+      Liquid::StrainerFactory.send(:strainer_class_cache).clear
+      Liquid::StrainerFactory.instance_variable_set(:@global_filters, original_global_filters)
     end
 
     def with_error_mode(mode)
@@ -87,10 +98,17 @@ module Minitest
     end
 
     def with_custom_tag(tag_name, tag_class)
-      Liquid::Template.register_tag(tag_name, tag_class)
-      yield
-    ensure
-      Liquid::Template.tags.delete(tag_name)
+      old_tag = Liquid::Template.tags[tag_name]
+      begin
+        Liquid::Template.register_tag(tag_name, tag_class)
+        yield
+      ensure
+        if old_tag
+          Liquid::Template.tags[tag_name] = old_tag
+        else
+          Liquid::Template.tags.delete(tag_name)
+        end
+      end
     end
   end
 end
@@ -136,3 +154,16 @@ class StubFileSystem
     @values.fetch(template_path)
   end
 end
+
+class StubTemplateFactory
+  attr_reader :count
+
+  def initialize
+    @count = 0
+  end
+
+  def for(_template_name)
+    @count += 1
+    Liquid::Template.new
+  end
+end

test/unit/block_unit_test.rb

@@ -45,53 +45,9 @@ class BlockUnitTest < Minitest::Test
     assert_equal(3, template.root.nodelist.size)
   end
 
-  def test_with_custom_tag
-    with_custom_tag('testtag', Block) do
-      assert Liquid::Template.parse("{% testtag %} {% endtesttag %}")
-    end
-  end
-
-  def test_custom_block_tags_have_a_default_render_to_output_buffer_method_for_backwards_compatibility
-    klass1 = Class.new(Block) do
-      def render(*)
-        'hello'
-      end
-    end
-
-    with_custom_tag('blabla', klass1) do
-      template = Liquid::Template.parse("{% blabla %} bla {% endblabla %}")
-
-      assert_equal 'hello', template.render
-
-      buf    = +''
-      output = template.render({}, output: buf)
-      assert_equal 'hello', output
-      assert_equal 'hello', buf
-      assert_equal buf.object_id, output.object_id
-    end
-
-    klass2 = Class.new(klass1) do
-      def render(*)
-        'foo' + super + 'bar'
-      end
-    end
-
-    with_custom_tag('blabla', klass2) do
-      template = Liquid::Template.parse("{% blabla %} foo {% endblabla %}")
-
-      assert_equal 'foohellobar', template.render
-
-      buf    = +''
-      output = template.render({}, output: buf)
-      assert_equal 'foohellobar', output
-      assert_equal 'foohellobar', buf
-      assert_equal buf.object_id, output.object_id
-    end
-  end
-
   private
 
   def block_types(nodelist)
     nodelist.collect(&:class)
   end
-end # VariableTest
+end

test/unit/context_unit_test.rb

@@ -1,579 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class HundredCentes
-  def to_liquid
-    100
-  end
-end
-
-class CentsDrop < Liquid::Drop
-  def amount
-    HundredCentes.new
-  end
-
-  def non_zero?
-    true
-  end
-end
-
-class ContextSensitiveDrop < Liquid::Drop
-  def test
-    @context['test']
-  end
-end
-
-class Category < Liquid::Drop
-  attr_accessor :name
-
-  def initialize(name)
-    @name = name
-  end
-
-  def to_liquid
-    CategoryDrop.new(self)
-  end
-end
-
-class CategoryDrop
-  attr_accessor :category, :context
-  def initialize(category)
-    @category = category
-  end
-end
-
-class CounterDrop < Liquid::Drop
-  def count
-    @count ||= 0
-    @count  += 1
-  end
-end
-
-class ArrayLike
-  def fetch(index)
-  end
-
-  def [](index)
-    @counts        ||= []
-    @counts[index] ||= 0
-    @counts[index]  += 1
-  end
-
-  def to_liquid
-    self
-  end
-end
-
-class ContextUnitTest < Minitest::Test
-  include Liquid
-
-  def setup
-    @context = Liquid::Context.new
-  end
-
-  def test_variables
-    @context['string'] = 'string'
-    assert_equal('string', @context['string'])
-
-    @context['num'] = 5
-    assert_equal(5, @context['num'])
-
-    @context['time'] = Time.parse('2006-06-06 12:00:00')
-    assert_equal(Time.parse('2006-06-06 12:00:00'), @context['time'])
-
-    @context['date'] = Date.today
-    assert_equal(Date.today, @context['date'])
-
-    now = Time.now
-    @context['datetime'] = now
-    assert_equal(now, @context['datetime'])
-
-    @context['bool'] = true
-    assert_equal(true, @context['bool'])
-
-    @context['bool'] = false
-    assert_equal(false, @context['bool'])
-
-    @context['nil'] = nil
-    assert_nil(@context['nil'])
-    assert_nil(@context['nil'])
-  end
-
-  def test_variables_not_existing
-    assert_nil(@context['does_not_exist'])
-  end
-
-  def test_scoping
-    @context.push
-    @context.pop
-
-    assert_raises(Liquid::ContextError) do
-      @context.pop
-    end
-
-    assert_raises(Liquid::ContextError) do
-      @context.push
-      @context.pop
-      @context.pop
-    end
-  end
-
-  def test_length_query
-    @context['numbers'] = [1, 2, 3, 4]
-
-    assert_equal(4, @context['numbers.size'])
-
-    @context['numbers'] = { 1 => 1, 2 => 2, 3 => 3, 4 => 4 }
-
-    assert_equal(4, @context['numbers.size'])
-
-    @context['numbers'] = { 1 => 1, 2 => 2, 3 => 3, 4 => 4, 'size' => 1000 }
-
-    assert_equal(1000, @context['numbers.size'])
-  end
-
-  def test_hyphenated_variable
-    @context['oh-my'] = 'godz'
-    assert_equal('godz', @context['oh-my'])
-  end
-
-  def test_add_filter
-    filter = Module.new do
-      def hi(output)
-        output + ' hi!'
-      end
-    end
-
-    context = Context.new
-    context.add_filters(filter)
-    assert_equal('hi? hi!', context.invoke(:hi, 'hi?'))
-
-    context = Context.new
-    assert_equal('hi?', context.invoke(:hi, 'hi?'))
-
-    context.add_filters(filter)
-    assert_equal('hi? hi!', context.invoke(:hi, 'hi?'))
-  end
-
-  def test_only_intended_filters_make_it_there
-    filter = Module.new do
-      def hi(output)
-        output + ' hi!'
-      end
-    end
-
-    context = Context.new
-    assert_equal("Wookie", context.invoke("hi", "Wookie"))
-
-    context.add_filters(filter)
-    assert_equal("Wookie hi!", context.invoke("hi", "Wookie"))
-  end
-
-  def test_add_item_in_outer_scope
-    @context['test'] = 'test'
-    @context.push
-    assert_equal('test', @context['test'])
-    @context.pop
-    assert_equal('test', @context['test'])
-  end
-
-  def test_add_item_in_inner_scope
-    @context.push
-    @context['test'] = 'test'
-    assert_equal('test', @context['test'])
-    @context.pop
-    assert_nil(@context['test'])
-  end
-
-  def test_hierachical_data
-    @context['hash'] = { "name" => 'tobi' }
-    assert_equal('tobi', @context['hash.name'])
-    assert_equal('tobi', @context['hash["name"]'])
-  end
-
-  def test_keywords
-    assert_equal(true, @context['true'])
-    assert_equal(false, @context['false'])
-  end
-
-  def test_digits
-    assert_equal(100, @context['100'])
-    assert_equal(100.00, @context['100.00'])
-  end
-
-  def test_strings
-    assert_equal("hello!", @context['"hello!"'])
-    assert_equal("hello!", @context["'hello!'"])
-  end
-
-  def test_merge
-    @context.merge("test" => "test")
-    assert_equal('test', @context['test'])
-    @context.merge("test" => "newvalue", "foo" => "bar")
-    assert_equal('newvalue', @context['test'])
-    assert_equal('bar', @context['foo'])
-  end
-
-  def test_array_notation
-    @context['test'] = [1, 2, 3, 4, 5]
-
-    assert_equal(1, @context['test[0]'])
-    assert_equal(2, @context['test[1]'])
-    assert_equal(3, @context['test[2]'])
-    assert_equal(4, @context['test[3]'])
-    assert_equal(5, @context['test[4]'])
-  end
-
-  def test_recoursive_array_notation
-    @context['test'] = { 'test' => [1, 2, 3, 4, 5] }
-
-    assert_equal(1, @context['test.test[0]'])
-
-    @context['test'] = [{ 'test' => 'worked' }]
-
-    assert_equal('worked', @context['test[0].test'])
-  end
-
-  def test_hash_to_array_transition
-    @context['colors'] = {
-      'Blue' => ['003366', '336699', '6699CC', '99CCFF'],
-      'Green' => ['003300', '336633', '669966', '99CC99'],
-      'Yellow' => ['CC9900', 'FFCC00', 'FFFF99', 'FFFFCC'],
-      'Red' => ['660000', '993333', 'CC6666', 'FF9999'],
-    }
-
-    assert_equal('003366', @context['colors.Blue[0]'])
-    assert_equal('FF9999', @context['colors.Red[3]'])
-  end
-
-  def test_try_first
-    @context['test'] = [1, 2, 3, 4, 5]
-
-    assert_equal(1, @context['test.first'])
-    assert_equal(5, @context['test.last'])
-
-    @context['test'] = { 'test' => [1, 2, 3, 4, 5] }
-
-    assert_equal(1, @context['test.test.first'])
-    assert_equal(5, @context['test.test.last'])
-
-    @context['test'] = [1]
-    assert_equal(1, @context['test.first'])
-    assert_equal(1, @context['test.last'])
-  end
-
-  def test_access_hashes_with_hash_notation
-    @context['products'] = { 'count' => 5, 'tags' => ['deepsnow', 'freestyle'] }
-    @context['product']  = { 'variants' => [{ 'title' => 'draft151cm' }, { 'title' => 'element151cm' }] }
-
-    assert_equal(5, @context['products["count"]'])
-    assert_equal('deepsnow', @context['products["tags"][0]'])
-    assert_equal('deepsnow', @context['products["tags"].first'])
-    assert_equal('draft151cm', @context['product["variants"][0]["title"]'])
-    assert_equal('element151cm', @context['product["variants"][1]["title"]'])
-    assert_equal('draft151cm', @context['product["variants"][0]["title"]'])
-    assert_equal('element151cm', @context['product["variants"].last["title"]'])
-  end
-
-  def test_access_variable_with_hash_notation
-    @context['foo'] = 'baz'
-    @context['bar'] = 'foo'
-
-    assert_equal('baz', @context['["foo"]'])
-    assert_equal('baz', @context['[bar]'])
-  end
-
-  def test_access_hashes_with_hash_access_variables
-    @context['var']      = 'tags'
-    @context['nested']   = { 'var' => 'tags' }
-    @context['products'] = { 'count' => 5, 'tags' => ['deepsnow', 'freestyle'] }
-
-    assert_equal('deepsnow', @context['products[var].first'])
-    assert_equal('freestyle', @context['products[nested.var].last'])
-  end
-
-  def test_hash_notation_only_for_hash_access
-    @context['array'] = [1, 2, 3, 4, 5]
-    @context['hash']  = { 'first' => 'Hello' }
-
-    assert_equal(1, @context['array.first'])
-    assert_nil(@context['array["first"]'])
-    assert_equal('Hello', @context['hash["first"]'])
-  end
-
-  def test_first_can_appear_in_middle_of_callchain
-    @context['product'] = { 'variants' => [{ 'title' => 'draft151cm' }, { 'title' => 'element151cm' }] }
-
-    assert_equal('draft151cm', @context['product.variants[0].title'])
-    assert_equal('element151cm', @context['product.variants[1].title'])
-    assert_equal('draft151cm', @context['product.variants.first.title'])
-    assert_equal('element151cm', @context['product.variants.last.title'])
-  end
-
-  def test_cents
-    @context.merge("cents" => HundredCentes.new)
-    assert_equal(100, @context['cents'])
-  end
-
-  def test_nested_cents
-    @context.merge("cents" => { 'amount' => HundredCentes.new })
-    assert_equal(100, @context['cents.amount'])
-
-    @context.merge("cents" => { 'cents' => { 'amount' => HundredCentes.new } })
-    assert_equal(100, @context['cents.cents.amount'])
-  end
-
-  def test_cents_through_drop
-    @context.merge("cents" => CentsDrop.new)
-    assert_equal(100, @context['cents.amount'])
-  end
-
-  def test_nested_cents_through_drop
-    @context.merge("vars" => { "cents" => CentsDrop.new })
-    assert_equal(100, @context['vars.cents.amount'])
-  end
-
-  def test_drop_methods_with_question_marks
-    @context.merge("cents" => CentsDrop.new)
-    assert(@context['cents.non_zero?'])
-  end
-
-  def test_context_from_within_drop
-    @context.merge("test" => '123', "vars" => ContextSensitiveDrop.new)
-    assert_equal('123', @context['vars.test'])
-  end
-
-  def test_nested_context_from_within_drop
-    @context.merge("test" => '123', "vars" => { "local" => ContextSensitiveDrop.new })
-    assert_equal('123', @context['vars.local.test'])
-  end
-
-  def test_ranges
-    @context.merge("test" => '5')
-    assert_equal((1..5), @context['(1..5)'])
-    assert_equal((1..5), @context['(1..test)'])
-    assert_equal((5..5), @context['(test..test)'])
-  end
-
-  def test_cents_through_drop_nestedly
-    @context.merge("cents" => { "cents" => CentsDrop.new })
-    assert_equal(100, @context['cents.cents.amount'])
-
-    @context.merge("cents" => { "cents" => { "cents" => CentsDrop.new } })
-    assert_equal(100, @context['cents.cents.cents.amount'])
-  end
-
-  def test_drop_with_variable_called_only_once
-    @context['counter'] = CounterDrop.new
-
-    assert_equal(1, @context['counter.count'])
-    assert_equal(2, @context['counter.count'])
-    assert_equal(3, @context['counter.count'])
-  end
-
-  def test_drop_with_key_called_only_once
-    @context['counter'] = CounterDrop.new
-
-    assert_equal(1, @context['counter["count"]'])
-    assert_equal(2, @context['counter["count"]'])
-    assert_equal(3, @context['counter["count"]'])
-  end
-
-  def test_proc_as_variable
-    @context['dynamic'] = proc { 'Hello' }
-
-    assert_equal('Hello', @context['dynamic'])
-  end
-
-  def test_lambda_as_variable
-    @context['dynamic'] = proc { 'Hello' }
-
-    assert_equal('Hello', @context['dynamic'])
-  end
-
-  def test_nested_lambda_as_variable
-    @context['dynamic'] = { "lambda" => proc { 'Hello' } }
-
-    assert_equal('Hello', @context['dynamic.lambda'])
-  end
-
-  def test_array_containing_lambda_as_variable
-    @context['dynamic'] = [1, 2, proc { 'Hello' }, 4, 5]
-
-    assert_equal('Hello', @context['dynamic[2]'])
-  end
-
-  def test_lambda_is_called_once
-    @context['callcount'] = proc {
-      @global ||= 0
-      @global  += 1
-      @global.to_s
-    }
-
-    assert_equal('1', @context['callcount'])
-    assert_equal('1', @context['callcount'])
-    assert_equal('1', @context['callcount'])
-
-    @global = nil
-  end
-
-  def test_nested_lambda_is_called_once
-    @context['callcount'] = { "lambda" => proc {
-                                            @global ||= 0
-                                            @global  += 1
-                                            @global.to_s
-                                          } }
-
-    assert_equal('1', @context['callcount.lambda'])
-    assert_equal('1', @context['callcount.lambda'])
-    assert_equal('1', @context['callcount.lambda'])
-
-    @global = nil
-  end
-
-  def test_lambda_in_array_is_called_once
-    @context['callcount'] = [1, 2, proc {
-                                     @global ||= 0
-                                     @global  += 1
-                                     @global.to_s
-                                   }, 4, 5]
-
-    assert_equal('1', @context['callcount[2]'])
-    assert_equal('1', @context['callcount[2]'])
-    assert_equal('1', @context['callcount[2]'])
-
-    @global = nil
-  end
-
-  def test_access_to_context_from_proc
-    @context.registers[:magic] = 345392
-
-    @context['magic'] = proc { @context.registers[:magic] }
-
-    assert_equal(345392, @context['magic'])
-  end
-
-  def test_to_liquid_and_context_at_first_level
-    @context['category'] = Category.new("foobar")
-    assert_kind_of(CategoryDrop, @context['category'])
-    assert_equal(@context, @context['category'].context)
-  end
-
-  def test_interrupt_avoids_object_allocations
-    assert_no_object_allocations do
-      @context.interrupt?
-    end
-  end
-
-  def test_context_initialization_with_a_proc_in_environment
-    contx = Context.new([test: ->(c) { c['poutine'] }], test: :foo)
-
-    assert(contx)
-    assert_nil(contx['poutine'])
-  end
-
-  def test_apply_global_filter
-    global_filter_proc = ->(output) { "#{output} filtered" }
-
-    context = Context.new
-    context.global_filter = global_filter_proc
-
-    assert_equal('hi filtered', context.apply_global_filter('hi'))
-  end
-
-  def test_static_environments_are_read_with_lower_priority_than_environments
-    context = Context.build(
-      static_environments: { 'shadowed' => 'static', 'unshadowed' => 'static' },
-      environments: { 'shadowed' => 'dynamic' }
-    )
-
-    assert_equal('dynamic', context['shadowed'])
-    assert_equal('static', context['unshadowed'])
-  end
-
-  def test_apply_global_filter_when_no_global_filter_exist
-    context = Context.new
-    assert_equal('hi', context.apply_global_filter('hi'))
-  end
-
-  def test_new_isolated_subcontext_does_not_inherit_variables
-    super_context = Context.new
-    super_context['my_variable'] = 'some value'
-    subcontext = super_context.new_isolated_subcontext
-
-    assert_nil(subcontext['my_variable'])
-  end
-
-  def test_new_isolated_subcontext_inherits_static_environment
-    super_context = Context.build(static_environments: { 'my_environment_value' => 'my value' })
-    subcontext    = super_context.new_isolated_subcontext
-
-    assert_equal('my value', subcontext['my_environment_value'])
-  end
-
-  def test_new_isolated_subcontext_inherits_resource_limits
-    resource_limits = ResourceLimits.new({})
-    super_context   = Context.new({}, {}, {}, false, resource_limits)
-    subcontext      = super_context.new_isolated_subcontext
-    assert_equal(resource_limits, subcontext.resource_limits)
-  end
-
-  def test_new_isolated_subcontext_inherits_exception_renderer
-    super_context = Context.new
-    super_context.exception_renderer = ->(_e) { 'my exception message' }
-    subcontext = super_context.new_isolated_subcontext
-    assert_equal('my exception message', subcontext.handle_error(Liquid::Error.new))
-  end
-
-  def test_new_isolated_subcontext_does_not_inherit_non_static_registers
-    registers = {
-      my_register: :my_value,
-    }
-    super_context = Context.new({}, {}, StaticRegisters.new(registers))
-    super_context.registers[:my_register] = :my_alt_value
-    subcontext                            = super_context.new_isolated_subcontext
-    assert_equal(:my_value, subcontext.registers[:my_register])
-  end
-
-  def test_new_isolated_subcontext_inherits_static_registers
-    super_context = Context.build(registers: { my_register: :my_value })
-    subcontext    = super_context.new_isolated_subcontext
-    assert_equal(:my_value, subcontext.registers[:my_register])
-  end
-
-  def test_new_isolated_subcontext_registers_do_not_pollute_context
-    super_context                      = Context.build(registers: { my_register: :my_value })
-    subcontext                         = super_context.new_isolated_subcontext
-    subcontext.registers[:my_register] = :my_alt_value
-    assert_equal(:my_value, super_context.registers[:my_register])
-  end
-
-  def test_new_isolated_subcontext_inherits_filters
-    my_filter = Module.new do
-      def my_filter(*)
-        'my filter result'
-      end
-    end
-
-    super_context = Context.new
-    super_context.add_filters([my_filter])
-    subcontext    = super_context.new_isolated_subcontext
-    template      = Template.parse('{{ 123 | my_filter }}')
-    assert_equal('my filter result', template.render(subcontext))
-  end
-
-  private
-
-  def assert_no_object_allocations
-    unless RUBY_ENGINE == 'ruby'
-      skip("stackprof needed to count object allocations")
-    end
-    require 'stackprof'
-
-    profile = StackProf.run(mode: :object) do
-      yield
-    end
-    assert_equal(0, profile[:samples])
-  end
-end # ContextTest

test/unit/i18n_unit_test.rb

@@ -28,7 +28,7 @@ class I18nUnitTest < Minitest::Test
   # end
 
   def test_raises_unknown_translation
-    assert_raises I18n::TranslationError do
+    assert_raises(I18n::TranslationError) do
       @i18n.translate("doesnt_exist")
     end
   end

test/unit/parse_tree_visitor_test.rb

@@ -238,7 +238,7 @@ class ParseTreeVisitorTest < Minitest::Test
   def traversal(template)
     ParseTreeVisitor
       .for(Template.parse(template).root)
-      .add_callback_for(VariableLookup, &:name)
+      .add_callback_for(VariableLookup) { |node| node.name } # rubocop:disable Style/SymbolProc
   end
 
   def visit(template)

test/unit/partial_cache_unit_test.rb

@@ -90,4 +90,39 @@ class PartialCacheUnitTest < Minitest::Test
     # but measuring file reads is an OK proxy for this.
     assert_equal(1, file_system.file_read_count)
   end
+
+  def test_uses_default_template_factory_when_no_template_factory_found_in_register
+    context = Liquid::Context.build(
+      registers: {
+        file_system: StubFileSystem.new('my_partial' => 'my partial body'),
+      }
+    )
+
+    partial = Liquid::PartialCache.load(
+      'my_partial',
+      context: context,
+      parse_context: Liquid::ParseContext.new
+    )
+
+    assert_equal('my partial body', partial.render)
+  end
+
+  def test_uses_template_factory_register_if_present
+    template_factory = StubTemplateFactory.new
+    context = Liquid::Context.build(
+      registers: {
+        file_system: StubFileSystem.new('my_partial' => 'my partial body'),
+        template_factory: template_factory,
+      }
+    )
+
+    partial = Liquid::PartialCache.load(
+      'my_partial',
+      context: context,
+      parse_context: Liquid::ParseContext.new
+    )
+
+    assert_equal('my partial body', partial.render)
+    assert_equal(1, template_factory.count)
+  end
 end

test/unit/registers/disabled_tags_unit_test.rb

@@ -1,36 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class DisabledTagsUnitTest < Minitest::Test
-  include Liquid
-
-  def test_disables_tag_specified
-    register = DisabledTags.new
-    register.disable(%w(foo bar)) do
-      assert_equal true, register.disabled?("foo")
-      assert_equal true, register.disabled?("bar")
-      assert_equal false, register.disabled?("unknown")
-    end
-  end
-
-  def test_disables_nested_tags
-    register = DisabledTags.new
-    register.disable(["foo"]) do
-      register.disable(["foo"]) do
-        assert_equal true, register.disabled?("foo")
-        assert_equal false, register.disabled?("bar")
-      end
-      register.disable(["bar"]) do
-        assert_equal true, register.disabled?("foo")
-        assert_equal true, register.disabled?("bar")
-        register.disable(["foo"]) do
-          assert_equal true, register.disabled?("foo")
-          assert_equal true, register.disabled?("bar")
-        end
-      end
-      assert_equal true, register.disabled?("foo")
-      assert_equal false, register.disabled?("bar")
-    end
-  end
-end

test/unit/static_registers_unit_test.rb

@@ -5,244 +5,152 @@ require 'test_helper'
 class StaticRegistersUnitTest < Minitest::Test
   include Liquid
 
-  def set
-    static_register        = StaticRegisters.new
-    static_register[nil]   = true
-    static_register[1]     = :one
-    static_register[:one]  = "one"
-    static_register["two"] = "three"
-    static_register["two"] = 3
-    static_register[false] = nil
+  def test_set
+    static_register = StaticRegisters.new(a: 1, b: 2)
+    static_register[:b] = 22
+    static_register[:c] = 33
 
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.registers)
-
-    static_register
+    assert_equal(1, static_register[:a])
+    assert_equal(22, static_register[:b])
+    assert_equal(33, static_register[:c])
   end
 
-  def test_get
-    static_register = set
+  def test_get_missing_key
+    static_register = StaticRegisters.new
 
-    assert_equal(true, static_register[nil])
-    assert_equal(:one, static_register[1])
-    assert_equal("one", static_register[:one])
-    assert_equal(3, static_register["two"])
-    assert_nil(static_register[false])
-    assert_nil(static_register["unknown"])
+    assert_nil(static_register[:missing])
   end
 
   def test_delete
-    static_register = set
+    static_register = StaticRegisters.new(a: 1, b: 2)
+    static_register[:b] = 22
+    static_register[:c] = 33
 
-    assert_equal(true, static_register.delete(nil))
-    assert_equal(:one, static_register.delete(1))
-    assert_equal("one", static_register.delete(:one))
-    assert_equal(3, static_register.delete("two"))
-    assert_nil(static_register.delete(false))
-    assert_nil(static_register.delete("unknown"))
+    assert_nil(static_register.delete(:a))
 
-    assert_equal({}, static_register.registers)
+    assert_equal(22, static_register.delete(:b))
+
+    assert_equal(33, static_register.delete(:c))
+    assert_nil(static_register[:c])
+
+    assert_nil(static_register.delete(:d))
   end
 
   def test_fetch
-    static_register = set
+    static_register = StaticRegisters.new(a: 1, b: 2)
+    static_register[:b] = 22
+    static_register[:c] = 33
 
-    assert_equal(true, static_register.fetch(nil))
-    assert_equal(:one, static_register.fetch(1))
-    assert_equal("one", static_register.fetch(:one))
-    assert_equal(3, static_register.fetch("two"))
-    assert_nil(static_register.fetch(false))
-    assert_nil(static_register.fetch("unknown"))
-  end
+    assert_equal(1, static_register.fetch(:a))
+    assert_equal(1, static_register.fetch(:a, "default"))
+    assert_equal(22, static_register.fetch(:b))
+    assert_equal(22, static_register.fetch(:b, "default"))
+    assert_equal(33, static_register.fetch(:c))
+    assert_equal(33, static_register.fetch(:c, "default"))
 
-  def test_fetch_default
-    static_register = StaticRegisters.new
+    assert_raises(KeyError) do
+      static_register.fetch(:d)
+    end
+    assert_equal("default", static_register.fetch(:d, "default"))
 
-    assert_equal(true, static_register.fetch(nil, true))
-    assert_equal(:one, static_register.fetch(1, :one))
-    assert_equal("one", static_register.fetch(:one, "one"))
-    assert_equal(3, static_register.fetch("two", 3))
-    assert_nil(static_register.fetch(false, nil))
+    result = static_register.fetch(:d) { "default" }
+    assert_equal("default", result)
+
+    result = static_register.fetch(:d, "default 1") { "default 2" }
+    assert_equal("default 2", result)
   end
 
   def test_key
-    static_register = set
+    static_register = StaticRegisters.new(a: 1, b: 2)
+    static_register[:b] = 22
+    static_register[:c] = 33
 
-    assert_equal(true, static_register.key?(nil))
-    assert_equal(true, static_register.key?(1))
-    assert_equal(true, static_register.key?(:one))
-    assert_equal(true, static_register.key?("two"))
-    assert_equal(true, static_register.key?(false))
-    assert_equal(false, static_register.key?("unknown"))
-    assert_equal(false, static_register.key?(true))
-  end
-
-  def set_with_static
-    static_register        = StaticRegisters.new(nil => true, 1 => :one, :one => "one", "two" => 3, false => nil)
-    static_register[nil]   = false
-    static_register["two"] = 4
-    static_register[true]  = "foo"
-
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
-    assert_equal({ nil => false, "two" => 4, true => "foo" }, static_register.registers)
-
-    static_register
-  end
-
-  def test_get_with_static
-    static_register = set_with_static
-
-    assert_equal(false, static_register[nil])
-    assert_equal(:one, static_register[1])
-    assert_equal("one", static_register[:one])
-    assert_equal(4, static_register["two"])
-    assert_equal("foo", static_register[true])
-    assert_nil(static_register[false])
-  end
-
-  def test_delete_with_static
-    static_register = set_with_static
-
-    assert_equal(false, static_register.delete(nil))
-    assert_equal(4, static_register.delete("two"))
-    assert_equal("foo", static_register.delete(true))
-    assert_nil(static_register.delete("unknown"))
-    assert_nil(static_register.delete(:one))
-
-    assert_equal({}, static_register.registers)
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
-  end
-
-  def test_fetch_with_static
-    static_register = set_with_static
-
-    assert_equal(false, static_register.fetch(nil))
-    assert_equal(:one, static_register.fetch(1))
-    assert_equal("one", static_register.fetch(:one))
-    assert_equal(4, static_register.fetch("two"))
-    assert_equal("foo", static_register.fetch(true))
-    assert_nil(static_register.fetch(false))
-  end
-
-  def test_key_with_static
-    static_register = set_with_static
-
-    assert_equal(true, static_register.key?(nil))
-    assert_equal(true, static_register.key?(1))
-    assert_equal(true, static_register.key?(:one))
-    assert_equal(true, static_register.key?("two"))
-    assert_equal(true, static_register.key?(false))
-    assert_equal(false, static_register.key?("unknown"))
-    assert_equal(true, static_register.key?(true))
+    assert_equal(true, static_register.key?(:a))
+    assert_equal(true, static_register.key?(:b))
+    assert_equal(true, static_register.key?(:c))
+    assert_equal(false, static_register.key?(:d))
   end
 
   def test_static_register_can_be_frozen
-    static_register = set_with_static
+    static_register = StaticRegisters.new(a: 1)
 
-    static = static_register.static.freeze
+    static_register.static.freeze
 
     assert_raises(RuntimeError) do
-      static["two"] = "foo"
+      static_register.static[:a] = "foo"
     end
 
     assert_raises(RuntimeError) do
-      static["unknown"] = "foo"
+      static_register.static[:b] = "foo"
     end
 
     assert_raises(RuntimeError) do
-      static.delete("two")
+      static_register.static.delete(:a)
+    end
+
+    assert_raises(RuntimeError) do
+      static_register.static.delete(:c)
     end
   end
 
   def test_new_static_retains_static
-    static_register          = StaticRegisters.new(nil => true, 1 => :one, :one => "one", "two" => 3, false => nil)
-    static_register["one"]   = 1
-    static_register["two"]   = 2
-    static_register["three"] = 3
+    static_register = StaticRegisters.new(a: 1, b: 2)
+    static_register[:b] = 22
+    static_register[:c] = 33
 
-    new_register = StaticRegisters.new(static_register)
-    assert_equal({}, new_register.registers)
+    new_static_register = StaticRegisters.new(static_register)
+    new_static_register[:b] = 222
 
-    new_register["one"]   = 4
-    new_register["two"]   = 5
-    new_register["three"] = 6
+    newest_static_register = StaticRegisters.new(new_static_register)
+    newest_static_register[:c] = 333
 
-    newest_register = StaticRegisters.new(new_register)
-    assert_equal({}, newest_register.registers)
+    assert_equal(1, static_register[:a])
+    assert_equal(22, static_register[:b])
+    assert_equal(33, static_register[:c])
 
-    newest_register["one"]   = 7
-    newest_register["two"]   = 8
-    newest_register["three"] = 9
+    assert_equal(1, new_static_register[:a])
+    assert_equal(222, new_static_register[:b])
+    assert_nil(new_static_register[:c])
 
-    assert_equal({ "one" => 1, "two" => 2, "three" => 3 }, static_register.registers)
-    assert_equal({ "one" => 4, "two" => 5, "three" => 6 }, new_register.registers)
-    assert_equal({ "one" => 7, "two" => 8, "three" => 9 }, newest_register.registers)
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, new_register.static)
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, newest_register.static)
+    assert_equal(1, newest_static_register[:a])
+    assert_equal(2, newest_static_register[:b])
+    assert_equal(333, newest_static_register[:c])
   end
 
   def test_multiple_instances_are_unique
-    static_register          = StaticRegisters.new(nil => true, 1 => :one, :one => "one", "two" => 3, false => nil)
-    static_register["one"]   = 1
-    static_register["two"]   = 2
-    static_register["three"] = 3
+    static_register_1 = StaticRegisters.new(a: 1, b: 2)
+    static_register_1[:b] = 22
+    static_register_1[:c] = 33
 
-    new_register = StaticRegisters.new(foo: :bar)
-    assert_equal({}, new_register.registers)
+    static_register_2 = StaticRegisters.new(a: 10, b: 20)
+    static_register_2[:b] = 220
+    static_register_2[:c] = 330
 
-    new_register["one"]   = 4
-    new_register["two"]   = 5
-    new_register["three"] = 6
+    assert_equal({ a: 1, b: 2 }, static_register_1.static)
+    assert_equal(1, static_register_1[:a])
+    assert_equal(22, static_register_1[:b])
+    assert_equal(33, static_register_1[:c])
 
-    newest_register = StaticRegisters.new(bar: :foo)
-    assert_equal({}, newest_register.registers)
-
-    newest_register["one"]   = 7
-    newest_register["two"]   = 8
-    newest_register["three"] = 9
-
-    assert_equal({ "one" => 1, "two" => 2, "three" => 3 }, static_register.registers)
-    assert_equal({ "one" => 4, "two" => 5, "three" => 6 }, new_register.registers)
-    assert_equal({ "one" => 7, "two" => 8, "three" => 9 }, newest_register.registers)
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
-    assert_equal({ foo: :bar }, new_register.static)
-    assert_equal({ bar: :foo }, newest_register.static)
+    assert_equal({ a: 10, b: 20 }, static_register_2.static)
+    assert_equal(10, static_register_2[:a])
+    assert_equal(220, static_register_2[:b])
+    assert_equal(330, static_register_2[:c])
   end
 
-  def test_can_update_static_directly_and_updates_all_instances
-    static_register          = StaticRegisters.new(nil => true, 1 => :one, :one => "one", "two" => 3, false => nil)
-    static_register["one"]   = 1
-    static_register["two"]   = 2
-    static_register["three"] = 3
+  def test_initialization_reused_static_same_memory_object
+    static_register_1 = StaticRegisters.new(a: 1, b: 2)
+    static_register_1[:b] = 22
+    static_register_1[:c] = 33
 
-    new_register = StaticRegisters.new(static_register)
-    assert_equal({}, new_register.registers)
+    static_register_2 = StaticRegisters.new(static_register_1)
 
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
+    assert_equal(1, static_register_2[:a])
+    assert_equal(2, static_register_2[:b])
+    assert_nil(static_register_2[:c])
 
-    new_register["one"]         = 4
-    new_register["two"]         = 5
-    new_register["three"]       = 6
-    new_register.static["four"] = 10
+    static_register_1.static[:b] = 222
+    static_register_1.static[:c] = 333
 
-    newest_register = StaticRegisters.new(new_register)
-    assert_equal({}, newest_register.registers)
-
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil, "four" => 10 }, new_register.static)
-
-    newest_register["one"]      = 7
-    newest_register["two"]      = 8
-    newest_register["three"]    = 9
-    new_register.static["four"] = 5
-    new_register.static["five"] = 15
-
-    assert_equal({ "one" => 1, "two" => 2, "three" => 3 }, static_register.registers)
-    assert_equal({ "one" => 4, "two" => 5, "three" => 6 }, new_register.registers)
-    assert_equal({ "one" => 7, "two" => 8, "three" => 9 }, newest_register.registers)
-
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil, "four" => 5, "five" => 15 }, newest_register.static)
-
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil, "four" => 5, "five" => 15 }, static_register.static)
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil, "four" => 5, "five" => 15 }, new_register.static)
+    assert_same(static_register_1.static, static_register_2.static)
   end
 end

test/unit/strainer_factory_unit_test.rb

@@ -0,0 +1,100 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class StrainerFactoryUnitTest < Minitest::Test
+  include Liquid
+
+  module AccessScopeFilters
+    def public_filter
+      "public"
+    end
+
+    def private_filter
+      "private"
+    end
+    private :private_filter
+  end
+
+  StrainerFactory.add_global_filter(AccessScopeFilters)
+
+  module LateAddedFilter
+    def late_added_filter(_input)
+      "filtered"
+    end
+  end
+
+  def setup
+    @context = Context.build
+  end
+
+  def test_strainer
+    strainer = StrainerFactory.create(@context)
+    assert_equal(5, strainer.invoke('size', 'input'))
+    assert_equal("public", strainer.invoke("public_filter"))
+  end
+
+  def test_stainer_raises_argument_error
+    strainer = StrainerFactory.create(@context)
+    assert_raises(Liquid::ArgumentError) do
+      strainer.invoke("public_filter", 1)
+    end
+  end
+
+  def test_stainer_argument_error_contains_backtrace
+    strainer = StrainerFactory.create(@context)
+
+    exception = assert_raises(Liquid::ArgumentError) do
+      strainer.invoke("public_filter", 1)
+    end
+
+    assert_match(
+      /\ALiquid error: wrong number of arguments \((1 for 0|given 1, expected 0)\)\z/,
+      exception.message
+    )
+    assert_equal(exception.backtrace[0].split(':')[0], __FILE__)
+  end
+
+  def test_strainer_only_invokes_public_filter_methods
+    strainer = StrainerFactory.create(@context)
+    assert_equal(false, strainer.class.invokable?('__test__'))
+    assert_equal(false, strainer.class.invokable?('test'))
+    assert_equal(false, strainer.class.invokable?('instance_eval'))
+    assert_equal(false, strainer.class.invokable?('__send__'))
+    assert_equal(true, strainer.class.invokable?('size')) # from the standard lib
+  end
+
+  def test_strainer_returns_nil_if_no_filter_method_found
+    strainer = StrainerFactory.create(@context)
+    assert_nil(strainer.invoke("private_filter"))
+    assert_nil(strainer.invoke("undef_the_filter"))
+  end
+
+  def test_strainer_returns_first_argument_if_no_method_and_arguments_given
+    strainer = StrainerFactory.create(@context)
+    assert_equal("password", strainer.invoke("undef_the_method", "password"))
+  end
+
+  def test_strainer_only_allows_methods_defined_in_filters
+    strainer = StrainerFactory.create(@context)
+    assert_equal("1 + 1", strainer.invoke("instance_eval", "1 + 1"))
+    assert_equal("puts",  strainer.invoke("__send__", "puts", "Hi Mom"))
+    assert_equal("has_method?", strainer.invoke("invoke", "has_method?", "invoke"))
+  end
+
+  def test_strainer_uses_a_class_cache_to_avoid_method_cache_invalidation
+    a = Module.new
+    b = Module.new
+    strainer = StrainerFactory.create(@context, [a, b])
+    assert_kind_of(StrainerTemplate, strainer)
+    assert_kind_of(a, strainer)
+    assert_kind_of(b, strainer)
+    assert_kind_of(Liquid::StandardFilters, strainer)
+  end
+
+  def test_add_global_filter_clears_cache
+    assert_equal('input', StrainerFactory.create(@context).invoke('late_added_filter', 'input'))
+    StrainerFactory.add_global_filter(LateAddedFilter)
+    assert_equal('filtered', StrainerFactory.create(nil).invoke('late_added_filter', 'input'))
+  end
+end

test/unit/strainer_template_unit_test.rb

@@ -0,0 +1,82 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class StrainerTemplateUnitTest < Minitest::Test
+  include Liquid
+
+  def test_add_filter_when_wrong_filter_class
+    c = Context.new
+    s = c.strainer
+    wrong_filter = ->(v) { v.reverse }
+
+    exception = assert_raises(TypeError) do
+      s.class.add_filter(wrong_filter)
+    end
+    assert_equal(exception.message, "wrong argument type Proc (expected Module)")
+  end
+
+  module PrivateMethodOverrideFilter
+    private
+
+    def public_filter
+      "overriden as private"
+    end
+  end
+
+  def test_add_filter_raises_when_module_privately_overrides_registered_public_methods
+    strainer = Context.new.strainer
+
+    error = assert_raises(Liquid::MethodOverrideError) do
+      strainer.class.add_filter(PrivateMethodOverrideFilter)
+    end
+    assert_equal('Liquid error: Filter overrides registered public methods as non public: public_filter', error.message)
+  end
+
+  module ProtectedMethodOverrideFilter
+    protected
+
+    def public_filter
+      "overriden as protected"
+    end
+  end
+
+  def test_add_filter_raises_when_module_overrides_registered_public_method_as_protected
+    strainer = Context.new.strainer
+
+    error = assert_raises(Liquid::MethodOverrideError) do
+      strainer.class.add_filter(ProtectedMethodOverrideFilter)
+    end
+    assert_equal('Liquid error: Filter overrides registered public methods as non public: public_filter', error.message)
+  end
+
+  module PublicMethodOverrideFilter
+    def public_filter
+      "public"
+    end
+  end
+
+  def test_add_filter_does_not_raise_when_module_overrides_previously_registered_method
+    strainer = Context.new.strainer
+    with_global_filter do
+      strainer.class.add_filter(PublicMethodOverrideFilter)
+      assert(strainer.class.send(:filter_methods).include?('public_filter'))
+    end
+  end
+
+  def test_add_filter_does_not_include_already_included_module
+    mod = Module.new do
+      class << self
+        attr_accessor :include_count
+        def included(_mod)
+          self.include_count += 1
+        end
+      end
+      self.include_count = 0
+    end
+    strainer = Context.new.strainer
+    strainer.class.add_filter(mod)
+    strainer.class.add_filter(mod)
+    assert_equal(1, mod.include_count)
+  end
+end

test/unit/strainer_unit_test.rb

@@ -1,167 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class StrainerUnitTest < Minitest::Test
-  include Liquid
-
-  module AccessScopeFilters
-    def public_filter
-      "public"
-    end
-
-    def private_filter
-      "private"
-    end
-    private :private_filter
-  end
-
-  Strainer.global_filter(AccessScopeFilters)
-
-  def test_strainer
-    strainer = Strainer.create(nil)
-    assert_equal(5, strainer.invoke('size', 'input'))
-    assert_equal("public", strainer.invoke("public_filter"))
-  end
-
-  def test_stainer_raises_argument_error
-    strainer = Strainer.create(nil)
-    assert_raises(Liquid::ArgumentError) do
-      strainer.invoke("public_filter", 1)
-    end
-  end
-
-  def test_stainer_argument_error_contains_backtrace
-    strainer = Strainer.create(nil)
-    begin
-      strainer.invoke("public_filter", 1)
-    rescue Liquid::ArgumentError => e
-      assert_match(
-        /\ALiquid error: wrong number of arguments \((1 for 0|given 1, expected 0)\)\z/,
-        e.message
-      )
-      assert_equal(e.backtrace[0].split(':')[0], __FILE__)
-    end
-  end
-
-  def test_strainer_only_invokes_public_filter_methods
-    strainer = Strainer.create(nil)
-    assert_equal(false, strainer.class.invokable?('__test__'))
-    assert_equal(false, strainer.class.invokable?('test'))
-    assert_equal(false, strainer.class.invokable?('instance_eval'))
-    assert_equal(false, strainer.class.invokable?('__send__'))
-    assert_equal(true, strainer.class.invokable?('size')) # from the standard lib
-  end
-
-  def test_strainer_returns_nil_if_no_filter_method_found
-    strainer = Strainer.create(nil)
-    assert_nil(strainer.invoke("private_filter"))
-    assert_nil(strainer.invoke("undef_the_filter"))
-  end
-
-  def test_strainer_returns_first_argument_if_no_method_and_arguments_given
-    strainer = Strainer.create(nil)
-    assert_equal("password", strainer.invoke("undef_the_method", "password"))
-  end
-
-  def test_strainer_only_allows_methods_defined_in_filters
-    strainer = Strainer.create(nil)
-    assert_equal("1 + 1", strainer.invoke("instance_eval", "1 + 1"))
-    assert_equal("puts",  strainer.invoke("__send__", "puts", "Hi Mom"))
-    assert_equal("has_method?", strainer.invoke("invoke", "has_method?", "invoke"))
-  end
-
-  def test_strainer_uses_a_class_cache_to_avoid_method_cache_invalidation
-    a = Module.new
-    b = Module.new
-    strainer = Strainer.create(nil, [a, b])
-    assert_kind_of(Strainer, strainer)
-    assert_kind_of(a, strainer)
-    assert_kind_of(b, strainer)
-    assert_kind_of(Liquid::StandardFilters, strainer)
-  end
-
-  def test_add_filter_when_wrong_filter_class
-    c = Context.new
-    s = c.strainer
-    wrong_filter = ->(v) { v.reverse }
-
-    assert_raises ArgumentError do
-      s.class.add_filter(wrong_filter)
-    end
-  end
-
-  module PrivateMethodOverrideFilter
-    private
-
-    def public_filter
-      "overriden as private"
-    end
-  end
-
-  def test_add_filter_raises_when_module_privately_overrides_registered_public_methods
-    strainer = Context.new.strainer
-
-    error = assert_raises(Liquid::MethodOverrideError) do
-      strainer.class.add_filter(PrivateMethodOverrideFilter)
-    end
-    assert_equal('Liquid error: Filter overrides registered public methods as non public: public_filter', error.message)
-  end
-
-  module ProtectedMethodOverrideFilter
-    protected
-
-    def public_filter
-      "overriden as protected"
-    end
-  end
-
-  def test_add_filter_raises_when_module_overrides_registered_public_method_as_protected
-    strainer = Context.new.strainer
-
-    error = assert_raises(Liquid::MethodOverrideError) do
-      strainer.class.add_filter(ProtectedMethodOverrideFilter)
-    end
-    assert_equal('Liquid error: Filter overrides registered public methods as non public: public_filter', error.message)
-  end
-
-  module PublicMethodOverrideFilter
-    def public_filter
-      "public"
-    end
-  end
-
-  def test_add_filter_does_not_raise_when_module_overrides_previously_registered_method
-    strainer = Context.new.strainer
-    strainer.class.add_filter(PublicMethodOverrideFilter)
-    assert(strainer.class.filter_methods.include?('public_filter'))
-  end
-
-  module LateAddedFilter
-    def late_added_filter(_input)
-      "filtered"
-    end
-  end
-
-  def test_global_filter_clears_cache
-    assert_equal('input', Strainer.create(nil).invoke('late_added_filter', 'input'))
-    Strainer.global_filter(LateAddedFilter)
-    assert_equal('filtered', Strainer.create(nil).invoke('late_added_filter', 'input'))
-  end
-
-  def test_add_filter_does_not_include_already_included_module
-    mod = Module.new do
-      class << self
-        attr_accessor :include_count
-        def included(_mod)
-          self.include_count += 1
-        end
-      end
-      self.include_count = 0
-    end
-    strainer = Context.new.strainer
-    strainer.class.add_filter(mod)
-    strainer.class.add_filter(mod)
-    assert_equal(1, mod.include_count)
-  end
-end # StrainerTest

test/unit/tag_unit_test.rb

@@ -20,42 +20,4 @@ class TagUnitTest < Minitest::Test
     tag = Tag.parse("some_tag", "", Tokenizer.new(""), ParseContext.new)
     assert_equal('some_tag', tag.tag_name)
   end
-
-  def test_custom_tags_have_a_default_render_to_output_buffer_method_for_backwards_compatibility
-    klass1 = Class.new(Tag) do
-      def render(*)
-        'hello'
-      end
-    end
-
-    with_custom_tag('blabla', klass1) do
-      template = Liquid::Template.parse("{% blabla %}")
-
-      assert_equal 'hello', template.render
-
-      buf    = +''
-      output = template.render({}, output: buf)
-      assert_equal 'hello', output
-      assert_equal 'hello', buf
-      assert_equal buf.object_id, output.object_id
-    end
-
-    klass2 = Class.new(klass1) do
-      def render(*)
-        'foo' + super + 'bar'
-      end
-    end
-
-    with_custom_tag('blabla', klass2) do
-      template = Liquid::Template.parse("{% blabla %}")
-
-      assert_equal 'foohellobar', template.render
-
-      buf    = +''
-      output = template.render({}, output: buf)
-      assert_equal 'foohellobar', output
-      assert_equal 'foohellobar', buf
-      assert_equal buf.object_id, output.object_id
-    end
-  end
 end

test/unit/template_factory_unit_test.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class TemplateFactoryUnitTest < Minitest::Test
+  include Liquid
+
+  def test_for_returns_liquid_template_instance
+    template = TemplateFactory.new.for("anything")
+    assert_instance_of(Liquid::Template, template)
+  end
+end

test/unit/template_unit_test.rb

@@ -77,4 +77,11 @@ class TemplateUnitTest < Minitest::Test
   ensure
     Template.tags.delete('fake')
   end
+
+  class TemplateSubclass < Liquid::Template
+  end
+
+  def test_template_inheritance
+    assert_equal("foo", TemplateSubclass.parse("foo").render)
+  end
 end

test/unit/tokenizer_unit_test.rb

@@ -32,21 +32,26 @@ class TokenizerTest < Minitest::Test
 
   private
 
+  def new_tokenizer(source, parse_context: Liquid::ParseContext.new, start_line_number: nil)
+    parse_context.new_tokenizer(source, start_line_number: start_line_number)
+  end
+
   def tokenize(source)
-    tokenizer = Liquid::Tokenizer.new(source)
+    tokenizer = new_tokenizer(source)
     tokens    = []
-    while (t = tokenizer.shift)
+    # shift is private in Liquid::C::Tokenizer, since it is only for unit testing
+    while (t = tokenizer.send(:shift))
       tokens << t
     end
     tokens
   end
 
   def tokenize_line_numbers(source)
-    tokenizer    = Liquid::Tokenizer.new(source, true)
+    tokenizer    = new_tokenizer(source, start_line_number: 1)
     line_numbers = []
     loop do
       line_number = tokenizer.line_number
-      if tokenizer.shift
+      if tokenizer.send(:shift)
         line_numbers << line_number
       else
         break

test/unit/variable_unit_test.rb

@@ -108,7 +108,7 @@ class VariableUnitTest < Minitest::Test
     assert_equal(VariableLookup.new('foo-bar'), create_variable('foo-bar').name)
     assert_equal(VariableLookup.new('foo-bar-2'), create_variable('foo-bar-2').name)
 
-    with_error_mode :strict do
+    with_error_mode(:strict) do
       assert_raises(Liquid::SyntaxError) { create_variable('foo - bar') }
       assert_raises(Liquid::SyntaxError) { create_variable('-foo') }
       assert_raises(Liquid::SyntaxError) { create_variable('2foo') }