Tidy instance variables

Instead of needing to squash instance assigns, we instead just put them at the bottom of the enviornment stack.

This simplifies the code base and gains extra performance by not needing to loop over scopes and environments.

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

@@ -1,5 +1,3 @@
-# Recommended rubocop version: ~> 0.78.0
-
 AllCops:
   Exclude:
   - 'db/schema.rb'
@@ -22,7 +20,7 @@ Style/Alias:
   - prefer_alias
   - prefer_alias_method
 
-Layout/HashAlignment:
+Layout/AlignHash:
   EnforcedHashRocketStyle: key
   EnforcedColonStyle: key
   EnforcedLastArgumentHashStyle: ignore_implicit
@@ -32,7 +30,7 @@ Layout/HashAlignment:
   - ignore_implicit
   - ignore_explicit
 
-Layout/ParameterAlignment:
+Layout/AlignParameters:
   EnforcedStyle: with_fixed_indentation
   SupportedStyles:
   - with_first_parameter
@@ -174,7 +172,7 @@ Naming/FileName:
   Regex:
   IgnoreExecutableScripts: true
 
-Layout/FirstArgumentIndentation:
+Layout/IndentFirstArgument:
   EnforcedStyle: consistent
   SupportedStyles:
   - consistent
@@ -227,7 +225,7 @@ Layout/IndentationConsistency:
 Layout/IndentationWidth:
   Width: 2
 
-Layout/FirstArrayElementIndentation:
+Layout/IndentFirstArrayElement:
   EnforcedStyle: consistent
   SupportedStyles:
   - special_inside_parentheses
@@ -235,10 +233,10 @@ Layout/FirstArrayElementIndentation:
   - align_brackets
   IndentationWidth:
 
-Layout/AssignmentIndentation:
+Layout/IndentAssignment:
   IndentationWidth:
 
-Layout/FirstHashElementIndentation:
+Layout/IndentFirstHashElement:
   EnforcedStyle: consistent
   SupportedStyles:
   - special_inside_parentheses
@@ -342,9 +340,9 @@ Style/PercentQLiterals:
 Naming/PredicateName:
   NamePrefix:
   - is_
-  ForbiddenPrefixes:
+  NamePrefixBlacklist:
   - is_
-  AllowedMethods:
+  NameWhitelist:
   - is_a?
   Exclude:
   - 'spec/**/*'
@@ -469,7 +467,7 @@ Style/TernaryParentheses:
   - require_no_parentheses
   AllowSafeAssignment: true
 
-Layout/TrailingEmptyLines:
+Layout/TrailingBlankLines:
   EnforcedStyle: final_newline
   SupportedStyles:
   - final_newline
@@ -480,7 +478,7 @@ Style/TrivialAccessors:
   AllowPredicates: true
   AllowDSLWriters: false
   IgnoreClassMethods: false
-  AllowedMethods:
+  Whitelist:
   - to_ary
   - to_a
   - to_c
@@ -511,7 +509,7 @@ Style/WhileUntilModifier:
 Metrics/BlockNesting:
   Max: 3
 
-Layout/LineLength:
+Metrics/LineLength:
   Max: 120
   AllowHeredoc: true
   AllowURI: true
@@ -563,7 +561,7 @@ Lint/UnusedMethodArgument:
 Naming/AccessorMethodName:
   Enabled: true
 
-Layout/ArrayAlignment:
+Layout/AlignArray:
   Enabled: true
 
 Style/ArrayJoin:
@@ -821,13 +819,13 @@ Layout/TrailingWhitespace:
 Style/UnlessElse:
   Enabled: true
 
-Style/RedundantCapitalW:
+Style/UnneededCapitalW:
   Enabled: true
 
-Style/RedundantInterpolation:
+Style/UnneededInterpolation:
   Enabled: true
 
-Style/RedundantPercentQ:
+Style/UnneededPercentQ:
   Enabled: true
 
 Style/VariableInterpolation:
@@ -842,7 +840,7 @@ Style/WhileUntilDo:
 Style/ZeroLengthPredicate:
   Enabled: true
 
-Layout/HeredocIndentation:
+Layout/IndentHeredoc:
   EnforcedStyle: squiggly
 
 Lint/AmbiguousOperator:
@@ -866,7 +864,7 @@ Lint/DeprecatedClassMethods:
 Lint/DuplicateMethods:
   Enabled: true
 
-Lint/DuplicateHashKey:
+Lint/DuplicatedKey:
   Enabled: true
 
 Lint/EachWithObjectArgument:
@@ -893,8 +891,8 @@ Lint/FloatOutOfRange:
 Lint/FormatParameterMismatch:
   Enabled: true
 
-Lint/SuppressedException:
-  AllowComments: true
+Lint/HandleExceptions:
+  Enabled: true
 
 Lint/ImplicitStringConcatenation:
   Description: Checks for adjacent string literals on the same line, which could
@@ -949,7 +947,7 @@ Lint/ShadowedException:
 Lint/ShadowingOuterLocalVariable:
   Enabled: true
 
-Lint/RedundantStringCoercion:
+Lint/StringConversionInInterpolation:
   Enabled: true
 
 Lint/UnderscorePrefixedVariableName:
@@ -958,13 +956,13 @@ Lint/UnderscorePrefixedVariableName:
 Lint/UnifiedInteger:
   Enabled: true
 
-Lint/RedundantCopDisableDirective:
+Lint/UnneededCopDisableDirective:
   Enabled: true
 
-Lint/RedundantCopEnableDirective:
+Lint/UnneededCopEnableDirective:
   Enabled: true
 
-Lint/RedundantSplatExpansion:
+Lint/UnneededSplatExpansion:
   Enabled: true
 
 Lint/UnreachableCode:

.rubocop.yml

@@ -1,5 +1,5 @@
 inherit_from:
-  - 'https://shopify.github.io/ruby-style-guide/rubocop.yml'
+  - https://shopify.github.io/ruby-style-guide/rubocop.yml
   - .rubocop_todo.yml
 
 require: rubocop-performance
@@ -8,10 +8,9 @@ Performance:
   Enabled: true
 
 AllCops:
-  TargetRubyVersion: 2.4
   Exclude:
     - 'vendor/bundle/**/*'
-
+      
 Naming/MethodName:
   Exclude:
-    - 'example/server/liquid_servlet.rb'
+    - 'example/server/liquid_servlet.rb'

.rubocop_todo.yml

@@ -6,6 +6,26 @@
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
+# Offense count: 2
+Lint/AmbiguousOperator:
+  Exclude:
+    - 'test/unit/condition_unit_test.rb'
+
+# Offense count: 21
+# Configuration parameters: AllowSafeAssignment.
+Lint/AssignmentInCondition:
+  Exclude:
+    - 'lib/liquid/block_body.rb'
+    - 'lib/liquid/lexer.rb'
+    - 'lib/liquid/standardfilters.rb'
+    - 'lib/liquid/tags/for.rb'
+    - 'lib/liquid/tags/if.rb'
+    - 'lib/liquid/tags/raw.rb'
+    - 'lib/liquid/variable.rb'
+    - 'performance/profile.rb'
+    - 'test/test_helper.rb'
+    - 'test/unit/tokenizer_unit_test.rb'
+
 # Offense count: 2
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle.
@@ -14,11 +34,22 @@ Lint/InheritException:
   Exclude:
     - 'lib/liquid/interrupts.rb'
 
+# Offense count: 2
+Lint/UselessAssignment:
+  Exclude:
+    - 'performance/shopify/database.rb'
+
+# Offense count: 1
+# Configuration parameters: CheckForMethodsWithNoSideEffects.
+Lint/Void:
+  Exclude:
+    - 'lib/liquid/parse_context.rb'
+
 # Offense count: 98
 # Cop supports --auto-correct.
 # Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
-Layout/LineLength:
+Metrics/LineLength:
   Max: 294
 
 # Offense count: 44
@@ -45,4 +76,26 @@ Style/ClassVars:
   Exclude:
     - 'lib/liquid/condition.rb'
     - 'lib/liquid/strainer.rb'
-    - 'lib/liquid/template.rb'
+    - 'lib/liquid/template.rb'
+
+# Offense count: 1
+# Configuration parameters: AllowCoercion.
+Style/DateTime:
+  Exclude:
+    - 'test/unit/context_unit_test.rb'
+
+# Offense count: 119
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: always, never
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+# Offense count: 9
+# Cop supports --auto-correct.
+# Configuration parameters: AllowAsExpressionSeparator.
+Style/Semicolon:
+  Exclude:
+    - 'test/integration/error_handling_test.rb'
+    - 'test/integration/template_test.rb'
+    - 'test/unit/context_unit_test.rb'

.travis.yml

@@ -4,9 +4,11 @@ cache: bundler
 rvm:
   - 2.4
   - 2.5
-  - 2.6
-  - &latest_ruby 2.7
+  - &latest_ruby 2.6
+  - 2.7
   - ruby-head
+  - jruby-head
+  - truffleruby
 
 matrix:
   include:
@@ -15,6 +17,8 @@ matrix:
       name: Profiling Memory Usage
   allow_failures:
     - rvm: ruby-head
+    - rvm: jruby-head
+    - rvm: truffleruby
 
 branches:
   only:

Gemfile

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 source 'https://rubygems.org'
 git_source(:github) do |repo_name|
   "https://github.com/#{repo_name}.git"
@@ -18,10 +16,10 @@ group :benchmark, :test do
 end
 
 group :test do
-  gem 'rubocop', '~> 0.78.0', require: false
+  gem 'rubocop', '~> 0.74.0', require: false
   gem 'rubocop-performance', require: false
 
   platform :mri, :truffleruby do
-    gem 'liquid-c', github: 'Shopify/liquid-c', branch: 'symbol-filter-names'
+    gem 'liquid-c', github: 'Shopify/liquid-c', ref: 'master'
   end
 end

History.md

@@ -1,11 +1,5 @@
 # Liquid Change Log
 
-### Unreleased
-
-* Split Strainer class as a factory and a template (#1208) [Thierry Joyal]
-* Remove handling of a nil context in the Strainer class (#1218) [Thierry Joyal]
-* StaticRegisters#fetch to raise on missing key (#1250) [Thierry Joyal]
-
 ## 4.0.3 / 2019-03-12
 
 ### Fixed

Rakefile

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'rake'
 require 'rake/testtask'
 $LOAD_PATH.unshift(File.expand_path("../lib", __FILE__))
@@ -11,7 +9,7 @@ desc('run test suite with default parser')
 Rake::TestTask.new(:base_test) do |t|
   t.libs << '.' << 'lib' << 'test'
   t.test_files = FileList['test/{integration,unit}/**/*_test.rb']
-  t.verbose    = false
+  t.verbose = false
 end
 
 desc('run test suite with warn error mode')

example/server/example_servlet.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module ProductsFilter
   def price(integer)
     format("$%.2d USD", integer / 100.0)

example/server/liquid_servlet.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class LiquidServlet < WEBrick::HTTPServlet::AbstractServlet
   def do_GET(req, res)
     handle(:get, req, res)
@@ -12,16 +10,16 @@ class LiquidServlet < WEBrick::HTTPServlet::AbstractServlet
   private
 
   def handle(_type, req, res)
-    @request  = req
+    @request = req
     @response = res
 
     @request.path_info =~ /(\w+)\z/
-    @action  = Regexp.last_match(1) || 'index'
+    @action = Regexp.last_match(1) || 'index'
     @assigns = send(@action) if respond_to?(@action)
 
     @response['Content-Type'] = "text/html"
     @response.status = 200
-    @response.body   = Liquid::Template.parse(read_template).render(@assigns, filters: [ProductsFilter])
+    @response.body = Liquid::Template.parse(read_template).render(@assigns, filters: [ProductsFilter])
   end
 
   def read_template(filename = @action)

example/server/server.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'webrick'
 require 'rexml/document'
 

lib/liquid.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # Copyright (c) 2005 Tobias Luetke
 #
 # Permission is hereby granted, free of charge, to any person obtaining
@@ -23,10 +21,10 @@
 
 module Liquid
   FilterSeparator             = /\|/
-  ArgumentSeparator           = ','
-  FilterArgumentSeparator     = ':'
-  VariableAttributeSeparator  = '.'
-  WhitespaceControl           = '-'
+  ArgumentSeparator           = ','.freeze
+  FilterArgumentSeparator     = ':'.freeze
+  VariableAttributeSeparator  = '.'.freeze
+  WhitespaceControl           = '-'.freeze
   TagStart                    = /\{\%/
   TagEnd                      = /\%\}/
   VariableSignature           = /\(?[\w\-\.\[\]]\)?/
@@ -57,14 +55,11 @@ require 'liquid/forloop_drop'
 require 'liquid/extensions'
 require 'liquid/errors'
 require 'liquid/interrupts'
-require 'liquid/strainer_factory'
-require 'liquid/strainer_template'
+require 'liquid/strainer'
 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'
@@ -81,9 +76,6 @@ require 'liquid/tokenizer'
 require 'liquid/parse_context'
 require 'liquid/partial_cache'
 require 'liquid/usage'
-require 'liquid/register'
-require 'liquid/static_registers'
-require 'liquid/template_factory'
 
 # Load all the tags of the standard library
 #

lib/liquid/block.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Block < Tag
     MAX_DEPTH = 100
@@ -29,16 +27,16 @@ module Liquid
     end
 
     def unknown_tag(tag, _params, _tokens)
-      if tag == 'else'
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_else",
+      if tag == 'else'.freeze
+        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_else".freeze,
           block_name: block_name)
-      elsif tag.start_with?('end')
-        raise SyntaxError, parse_context.locale.t("errors.syntax.invalid_delimiter",
+      elsif tag.start_with?('end'.freeze)
+        raise SyntaxError, parse_context.locale.t("errors.syntax.invalid_delimiter".freeze,
           tag: tag,
           block_name: block_name,
           block_delimiter: block_delimiter)
       else
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag", tag: tag)
+        raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag".freeze, tag: tag)
       end
     end
 
@@ -54,7 +52,7 @@ module Liquid
 
     def parse_body(body, tokens)
       if parse_context.depth >= MAX_DEPTH
-        raise StackLevelError, "Nesting too deep"
+        raise StackLevelError, "Nesting too deep".freeze
       end
       parse_context.depth += 1
       begin
@@ -63,7 +61,7 @@ module Liquid
 
           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)
+            raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed".freeze, block_name: block_name)
           end
 
           # this tag is not registered with the system

lib/liquid/block_body.rb

@@ -1,21 +1,17 @@
-# frozen_string_literal: true
-
-require 'English'
-
 module Liquid
   class BlockBody
-    LiquidTagToken      = /\A\s*(\w+)\s*(.*?)\z/o
-    FullToken           = /\A#{TagStart}#{WhitespaceControl}?(\s*)(\w+)(\s*)(.*?)#{WhitespaceControl}?#{TagEnd}\z/om
-    ContentOfVariable   = /\A#{VariableStart}#{WhitespaceControl}?(.*?)#{WhitespaceControl}?#{VariableEnd}\z/om
+    LiquidTagToken = /\A\s*(\w+)\s*(.*?)\z/o
+    FullToken = /\A#{TagStart}#{WhitespaceControl}?(\s*)(\w+)(\s*)(.*?)#{WhitespaceControl}?#{TagEnd}\z/om
+    ContentOfVariable = /\A#{VariableStart}#{WhitespaceControl}?(.*?)#{WhitespaceControl}?#{VariableEnd}\z/om
     WhitespaceOrNothing = /\A\s*\z/
-    TAGSTART            = "{%"
-    VARSTART            = "{{"
+    TAGSTART = "{%".freeze
+    VARSTART = "{{".freeze
 
     attr_reader :nodelist
 
     def initialize
       @nodelist = []
-      @blank    = true
+      @blank = true
     end
 
     def parse(tokenizer, parse_context, &block)
@@ -29,7 +25,7 @@ module Liquid
     end
 
     private def parse_for_liquid_tag(tokenizer, parse_context)
-      while (token = tokenizer.shift)
+      while token = tokenizer.shift
         unless token.empty? || token =~ WhitespaceOrNothing
           unless token =~ LiquidTagToken
             # line isn't empty but didn't match tag syntax, yield and let the
@@ -37,8 +33,8 @@ module Liquid
             return yield token, token
           end
           tag_name = Regexp.last_match(1)
-          markup   = Regexp.last_match(2)
-          unless (tag = registered_tags[tag_name])
+          markup = Regexp.last_match(2)
+          unless tag = registered_tags[tag_name]
             # end parsing if we reach an unknown tag and let the caller decide
             # determine how to proceed
             return yield tag_name, markup
@@ -53,23 +49,8 @@ module Liquid
       yield nil, nil
     end
 
-    # @api private
-    def self.unknown_tag_in_liquid_tag(end_tag_name, end_tag_markup)
-      yield end_tag_name, end_tag_markup
-    ensure
-      Usage.increment("liquid_tag_contains_outer_tag") unless $ERROR_INFO.is_a?(SyntaxError)
-    end
-
-    private def parse_liquid_tag(markup, parse_context, &block)
-      liquid_tag_tokenizer = Tokenizer.new(markup, 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|
-        next unless end_tag_name
-        self.class.unknown_tag_in_liquid_tag(end_tag_name, end_tag_markup, &block)
-      end
-    end
-
     private def parse_for_document(tokenizer, parse_context, &block)
-      while (token = tokenizer.shift)
+      while token = tokenizer.shift
         next if token.empty?
         case
         when token.start_with?(TAGSTART)
@@ -78,20 +59,20 @@ module Liquid
             raise_missing_tag_terminator(token, parse_context)
           end
           tag_name = Regexp.last_match(2)
-          markup   = Regexp.last_match(4)
+          markup = Regexp.last_match(4)
 
           if parse_context.line_number
             # newlines inside the tag should increase the line number,
             # particularly important for multiline {% liquid %} tags
-            parse_context.line_number += Regexp.last_match(1).count("\n") + Regexp.last_match(3).count("\n")
+            parse_context.line_number += Regexp.last_match(1).count("\n".freeze) + Regexp.last_match(3).count("\n".freeze)
           end
 
-          if tag_name == 'liquid'
-            parse_liquid_tag(markup, parse_context, &block)
-            next
+          if tag_name == 'liquid'.freeze
+            liquid_tag_tokenizer = Tokenizer.new(markup, line_number: parse_context.line_number, for_liquid_tag: true)
+            next parse_for_liquid_tag(liquid_tag_tokenizer, parse_context, &block)
           end
 
-          unless (tag = registered_tags[tag_name])
+          unless tag = registered_tags[tag_name]
             # end parsing if we reach an unknown tag and let the caller decide
             # determine how to proceed
             return yield tag_name, markup
@@ -132,14 +113,14 @@ module Liquid
     end
 
     def render(context)
-      render_to_output_buffer(context, +'')
+      render_to_output_buffer(context, '')
     end
 
     def render_to_output_buffer(context, output)
       context.resource_limits.render_score += @nodelist.length
 
       idx = 0
-      while (node = @nodelist[idx])
+      while node = @nodelist[idx]
         previous_output_size = output.bytesize
 
         case node
@@ -148,7 +129,7 @@ module Liquid
         when Variable
           render_node(context, output, node)
         when Block
-          render_node(context, node.blank? ? +'' : output, node)
+          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
@@ -182,7 +163,7 @@ module Liquid
     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"
+      raise MemoryError, "Memory limits exceeded".freeze
     end
 
     def create_variable(token, parse_context)
@@ -194,11 +175,11 @@ module Liquid
     end
 
     def raise_missing_tag_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination", token: token, tag_end: TagEnd.inspect)
+      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination".freeze, token: token, tag_end: TagEnd.inspect)
     end
 
     def raise_missing_variable_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination", token: token, tag_end: VariableEnd.inspect)
+      raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination".freeze, token: token, tag_end: VariableEnd.inspect)
     end
 
     def registered_tags

lib/liquid/condition.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Container for liquid nodes which conveniently wraps decision making logic
   #
@@ -10,14 +8,14 @@ module Liquid
   #
   class Condition #:nodoc:
     @@operators = {
-      '==' => ->(cond, left, right) {  cond.send(:equal_variables, left, right) },
-      '!=' => ->(cond, left, right) { !cond.send(:equal_variables, left, right) },
-      '<>' => ->(cond, left, right) { !cond.send(:equal_variables, left, right) },
-      '<' => :<,
-      '>' => :>,
-      '>=' => :>=,
-      '<=' => :<=,
-      'contains' => lambda do |_cond, left, right|
+      '=='.freeze => ->(cond, left, right) {  cond.send(:equal_variables, left, right) },
+      '!='.freeze => ->(cond, left, right) { !cond.send(:equal_variables, left, right) },
+      '<>'.freeze => ->(cond, left, right) { !cond.send(:equal_variables, left, right) },
+      '<'.freeze => :<,
+      '>'.freeze => :>,
+      '>='.freeze => :>=,
+      '<='.freeze => :<=,
+      'contains'.freeze => lambda do |_cond, left, right|
         if left && right && left.respond_to?(:include?)
           right = right.to_s if left.is_a?(String)
           left.include?(right)
@@ -35,11 +33,10 @@ module Liquid
     attr_accessor :left, :operator, :right
 
     def initialize(left = nil, operator = nil, right = nil)
-      @left     = left
+      @left = left
       @operator = operator
-      @right    = right
-
-      @child_relation  = nil
+      @right = right
+      @child_relation = nil
       @child_condition = nil
     end
 
@@ -63,12 +60,12 @@ module Liquid
     end
 
     def or(condition)
-      @child_relation  = :or
+      @child_relation = :or
       @child_condition = condition
     end
 
     def and(condition)
-      @child_relation  = :and
+      @child_relation = :and
       @child_condition = condition
     end
 
@@ -81,7 +78,7 @@ module Liquid
     end
 
     def inspect
-      "#<Condition #{[@left, @operator, @right].compact.join(' ')}>"
+      "#<Condition #{[@left, @operator, @right].compact.join(' '.freeze)}>"
     end
 
     protected
@@ -116,7 +113,7 @@ module Liquid
       # return this as the result.
       return context.evaluate(left) if op.nil?
 
-      left  = context.evaluate(left)
+      left = context.evaluate(left)
       right = context.evaluate(right)
 
       operation = self.class.operators[op] || raise(Liquid::ArgumentError, "Unknown operator #{op}")

lib/liquid/context.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Context keeps the variable stack and resolves variables, as well as keywords
   #
@@ -18,33 +16,29 @@ 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_registers: {}, static_environments: {})
+      new(environments, outer_scope, registers, rethrow_errors, resource_limits, static_registers, static_environments)
     end
 
-    def initialize(environments = {}, outer_scope = {}, registers = {}, rethrow_errors = false, resource_limits = nil, static_environments = {})
-      @environments = [environments]
-      @environments.flatten!
-
+    def initialize(environments = {}, outer_scope = {}, registers = {}, rethrow_errors = false, resource_limits = nil, static_registers = {}, static_environments = {})
+      @environments        = environments.is_a?(Array) ? environments : [environments]
       @static_environments = [static_environments].flat_map(&:freeze).freeze
       @scopes              = [(outer_scope || {})]
       @registers           = registers
+      @static_registers    = static_registers.freeze
       @errors              = []
       @partial             = false
       @strict_variables    = false
       @resource_limits     = resource_limits || ResourceLimits.new(Template.default_resource_limits)
       @base_scope_depth    = 0
-      squash_instance_assigns_with_environments
+      @interrupts          = []
+      @filters             = []
+      @global_filter       = nil
 
       self.exception_renderer = Template.default_exception_renderer
       if rethrow_errors
         self.exception_renderer = ->(_e) { raise }
       end
-
-      @interrupts    = []
-      @filters       = []
-      @global_filter = nil
-      @disabled_tags = {}
     end
     # rubocop:enable Metrics/ParameterLists
 
@@ -53,7 +47,7 @@ module Liquid
     end
 
     def strainer
-      @strainer ||= StrainerFactory.create(self, @filters)
+      @strainer ||= Strainer.create(self, @filters)
     end
 
     # Adds filters to this context.
@@ -88,7 +82,7 @@ module Liquid
     def handle_error(e, line_number = nil)
       e = internal_error unless e.is_a?(Liquid::Error)
       e.template_name ||= template_name
-      e.line_number   ||= line_number
+      e.line_number ||= line_number
       errors.push(e)
       exception_renderer.call(e).to_s
     end
@@ -137,15 +131,14 @@ module Liquid
       Context.build(
         resource_limits: resource_limits,
         static_environments: static_environments,
-        registers: StaticRegisters.new(registers)
+        static_registers: static_registers
       ).tap do |subcontext|
-        subcontext.base_scope_depth   = base_scope_depth + 1
+        subcontext.base_scope_depth = base_scope_depth + 1
         subcontext.exception_renderer = exception_renderer
-        subcontext.filters  = @filters
+        subcontext.filters = @filters
         subcontext.strainer = nil
-        subcontext.errors   = errors
+        subcontext.errors = errors
         subcontext.warnings = warnings
-        subcontext.disabled_tags = @disabled_tags
       end
     end
 
@@ -190,7 +183,7 @@ module Liquid
         try_variable_find_in_environments(key, raise_on_not_found: raise_on_not_found)
       end
 
-      variable         = variable.to_liquid
+      variable = variable.to_liquid
       variable.context = self if variable.respond_to?(:context=)
 
       variable
@@ -210,24 +203,9 @@ 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, :disabled_tags
+    attr_writer :base_scope_depth, :warnings, :errors, :strainer, :filters
 
     private
 
@@ -250,7 +228,7 @@ module Liquid
     end
 
     def check_overflow
-      raise StackLevelError, "Nesting too deep" if overflow?
+      raise StackLevelError, "Nesting too deep".freeze if overflow?
     end
 
     def overflow?
@@ -263,16 +241,5 @@ module Liquid
     rescue Liquid::InternalError => exc
       exc
     end
-
-    def squash_instance_assigns_with_environments
-      @scopes.last.each_key do |k|
-        @environments.each do |env|
-          if env.key?(k)
-            scopes.last[k] = lookup_and_evaluate(env, k)
-            break
-          end
-        end
-      end
-    end # squash_instance_assigns_with_environments
   end # Context
 end # Liquid

lib/liquid/document.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Document < BlockBody
     def self.parse(tokens, parse_context)
@@ -19,10 +17,10 @@ module Liquid
 
     def unknown_tag(tag, parse_context)
       case tag
-      when 'else', 'end'
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_outer_tag", tag: tag)
+      when 'else'.freeze, 'end'.freeze
+        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_outer_tag".freeze, tag: tag)
       else
-        raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag", tag: tag)
+        raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag".freeze, tag: tag)
       end
     end
   end

lib/liquid/drop.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'set'
 
 module Liquid
@@ -69,7 +67,7 @@ module Liquid
 
         if include?(Enumerable)
           blacklist += Enumerable.public_instance_methods
-          blacklist -= [:sort, :count, :first, :min, :max]
+          blacklist -= [:sort, :count, :first, :min, :max, :include?]
         end
 
         whitelist = [:to_liquid] + (public_instance_methods - blacklist)

lib/liquid/errors.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Error < ::StandardError
     attr_accessor :line_number
@@ -7,7 +5,7 @@ module Liquid
     attr_accessor :markup_context
 
     def to_s(with_prefix = true)
-      str = +""
+      str = ""
       str << message_prefix if with_prefix
       str << super()
 
@@ -22,7 +20,7 @@ module Liquid
     private
 
     def message_prefix
-      str = +""
+      str = ""
       str << if is_a?(SyntaxError)
         "Liquid syntax error"
       else
@@ -40,19 +38,19 @@ module Liquid
     end
   end
 
-  ArgumentError       = Class.new(Error)
-  ContextError        = Class.new(Error)
-  FileSystemError     = Class.new(Error)
-  StandardError       = Class.new(Error)
-  SyntaxError         = Class.new(Error)
-  StackLevelError     = Class.new(Error)
-  MemoryError         = Class.new(Error)
-  ZeroDivisionError   = Class.new(Error)
-  FloatDomainError    = Class.new(Error)
-  UndefinedVariable   = Class.new(Error)
+  ArgumentError = Class.new(Error)
+  ContextError = Class.new(Error)
+  FileSystemError = Class.new(Error)
+  StandardError = Class.new(Error)
+  SyntaxError = Class.new(Error)
+  StackLevelError = Class.new(Error)
+  TaintedError = Class.new(Error)
+  MemoryError = Class.new(Error)
+  ZeroDivisionError = Class.new(Error)
+  FloatDomainError = Class.new(Error)
+  UndefinedVariable = Class.new(Error)
   UndefinedDropMethod = Class.new(Error)
-  UndefinedFilter     = Class.new(Error)
+  UndefinedFilter = Class.new(Error)
   MethodOverrideError = Class.new(Error)
-  DisabledError       = Class.new(Error)
-  InternalError       = Class.new(Error)
+  InternalError = Class.new(Error)
 end

lib/liquid/expression.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Expression
     class MethodLiteral
@@ -16,11 +14,11 @@ module Liquid
     end
 
     LITERALS = {
-      nil => nil, 'nil' => nil, 'null' => nil, '' => nil,
-      'true' => true,
-      'false' => false,
-      'blank' => MethodLiteral.new(:blank?, '').freeze,
-      'empty' => MethodLiteral.new(:empty?, '').freeze
+      nil => nil, 'nil'.freeze => nil, 'null'.freeze => nil, ''.freeze => nil,
+      'true'.freeze => true,
+      'false'.freeze => false,
+      'blank'.freeze => MethodLiteral.new(:blank?, '').freeze,
+      'empty'.freeze => MethodLiteral.new(:empty?, '').freeze
     }.freeze
 
     SINGLE_QUOTED_STRING = /\A'(.*)'\z/m

lib/liquid/extensions.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'time'
 require 'date'
 

lib/liquid/file_system.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # A Liquid file system is a way to let your templates retrieve other templates for use with the include tag.
   #
@@ -46,8 +44,8 @@ module Liquid
   class LocalFileSystem
     attr_accessor :root
 
-    def initialize(root, pattern = "_%s.liquid")
-      @root    = root
+    def initialize(root, pattern = "_%s.liquid".freeze)
+      @root = root
       @pattern = pattern
     end
 
@@ -59,9 +57,9 @@ module Liquid
     end
 
     def full_path(template_path)
-      raise FileSystemError, "Illegal template name '#{template_path}'" unless %r{\A[^./][a-zA-Z0-9_/]+\z}.match?(template_path)
+      raise FileSystemError, "Illegal template name '#{template_path}'" unless template_path =~ %r{\A[^./][a-zA-Z0-9_/]+\z}
 
-      full_path = if template_path.include?('/')
+      full_path = if template_path.include?('/'.freeze)
         File.join(root, File.dirname(template_path), @pattern % File.basename(template_path))
       else
         File.join(root, @pattern % template_path)

lib/liquid/forloop_drop.rb

@@ -1,12 +1,10 @@
-# frozen_string_literal: true
-
 module Liquid
   class ForloopDrop < Drop
     def initialize(name, length, parentloop)
-      @name       = name
-      @length     = length
+      @name = name
+      @length = length
       @parentloop = parentloop
-      @index      = 0
+      @index = 0
     end
 
     attr_reader :name, :length, :parentloop

lib/liquid/i18n.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'yaml'
 
 module Liquid
@@ -33,7 +31,7 @@ module Liquid
     end
 
     def deep_fetch_translation(name)
-      name.split('.').reduce(locale) do |level, cur|
+      name.split('.'.freeze).reduce(locale) do |level, cur|
         level[cur] || raise(TranslationError, "Translation for #{name} does not exist in locale #{path}")
       end
     end

lib/liquid/interrupts.rb

@@ -1,12 +1,10 @@
-# frozen_string_literal: true
-
 module Liquid
   # An interrupt is any command that breaks processing of a block (ex: a for loop).
   class Interrupt
     attr_reader :message
 
     def initialize(message = nil)
-      @message = message || "interrupt"
+      @message = message || "interrupt".freeze
     end
   end
 

lib/liquid/lexer.rb

@@ -1,26 +1,24 @@
-# frozen_string_literal: true
-
 require "strscan"
 module Liquid
   class Lexer
     SPECIALS = {
-      '|' => :pipe,
-      '.' => :dot,
-      ':' => :colon,
-      ',' => :comma,
-      '[' => :open_square,
-      ']' => :close_square,
-      '(' => :open_round,
-      ')' => :close_round,
-      '?' => :question,
-      '-' => :dash,
+      '|'.freeze => :pipe,
+      '.'.freeze => :dot,
+      ':'.freeze => :colon,
+      ','.freeze => :comma,
+      '['.freeze => :open_square,
+      ']'.freeze => :close_square,
+      '('.freeze => :open_round,
+      ')'.freeze => :close_round,
+      '?'.freeze => :question,
+      '-'.freeze => :dash,
     }.freeze
-    IDENTIFIER            = /[a-zA-Z_][\w-]*\??/
+    IDENTIFIER = /[a-zA-Z_][\w-]*\??/
     SINGLE_STRING_LITERAL = /'[^\']*'/
     DOUBLE_STRING_LITERAL = /"[^\"]*"/
-    NUMBER_LITERAL        = /-?\d+(\.\d+)?/
-    DOTDOT                = /\.\./
-    COMPARISON_OPERATOR   = /==|!=|<>|<=?|>=?|contains(?=\s)/
+    NUMBER_LITERAL = /-?\d+(\.\d+)?/
+    DOTDOT = /\.\./
+    COMPARISON_OPERATOR = /==|!=|<>|<=?|>=?|contains(?=\s)/
     WHITESPACE_OR_NOTHING = /\s*/
 
     def initialize(input)
@@ -33,21 +31,15 @@ module Liquid
       until @ss.eos?
         @ss.skip(WHITESPACE_OR_NOTHING)
         break if @ss.eos?
-        tok      = if (t = @ss.scan(COMPARISON_OPERATOR))
-          [:comparison, t]
-        elsif (t = @ss.scan(SINGLE_STRING_LITERAL))
-          [:string, t]
-        elsif (t = @ss.scan(DOUBLE_STRING_LITERAL))
-          [:string, t]
-        elsif (t = @ss.scan(NUMBER_LITERAL))
-          [:number, t]
-        elsif (t = @ss.scan(IDENTIFIER))
-          [:id, t]
-        elsif (t = @ss.scan(DOTDOT))
-          [:dotdot, t]
+        tok = if t = @ss.scan(COMPARISON_OPERATOR) then [:comparison, t]
+        elsif t = @ss.scan(SINGLE_STRING_LITERAL) then [:string, t]
+        elsif t = @ss.scan(DOUBLE_STRING_LITERAL) then [:string, t]
+        elsif t = @ss.scan(NUMBER_LITERAL) then [:number, t]
+        elsif t = @ss.scan(IDENTIFIER) then [:id, t]
+        elsif t = @ss.scan(DOTDOT) then [:dotdot, t]
         else
-          c     = @ss.getch
-          if (s = SPECIALS[c])
+          c = @ss.getch
+          if s = SPECIALS[c]
             [s, c]
           else
             raise SyntaxError, "Unexpected character #{c}"

lib/liquid/locales/en.yml

@@ -25,5 +25,3 @@
       render: "Syntax error in tag 'render' - Template name must be a quoted string"
     argument:
       include: "Argument error in tag 'include' - Illegal template name"
-    disabled:
-      tag: "usage is not allowed in this context"

lib/liquid/parse_context.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class ParseContext
     attr_accessor :locale, :line_number, :trim_whitespace, :depth
@@ -7,11 +5,9 @@ module Liquid
 
     def initialize(options = {})
       @template_options = options ? options.dup : {}
-
-      @locale   = @template_options[:locale] ||= I18n.new
+      @locale = @template_options[:locale] ||= I18n.new
       @warnings = []
-
-      self.depth   = 0
+      self.depth = 0
       self.partial = false
     end
 
@@ -22,8 +18,8 @@ module Liquid
     def partial=(value)
       @partial = value
       @options = value ? partial_options : @template_options
-
       @error_mode = @options[:error_mode] || Template.error_mode
+      value
     end
 
     def partial_options

lib/liquid/parse_tree_visitor.rb

@@ -11,7 +11,7 @@ module Liquid
     end
 
     def initialize(node, callbacks)
-      @node      = node
+      @node = node
       @callbacks = callbacks
     end
 

lib/liquid/parser.rb

@@ -1,11 +1,9 @@
-# frozen_string_literal: true
-
 module Liquid
   class Parser
     def initialize(input)
-      l       = Lexer.new(input)
+      l = Lexer.new(input)
       @tokens = l.tokenize
-      @p      = 0 # pointer to current location
+      @p = 0 # pointer to current location
     end
 
     def jump(point)
@@ -68,10 +66,10 @@ module Liquid
     end
 
     def argument
-      str = +""
+      str = ""
       # might be a keyword argument (identifier: expression)
       if look(:id) && look(:colon, 1)
-        str << consume << consume << ' '
+        str << consume << consume << ' '.freeze
       end
 
       str << expression

lib/liquid/parser_switching.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   module ParserSwitching
     def parse_with_selected_parser(markup)
@@ -8,10 +6,10 @@ module Liquid
       when :lax    then lax_parse(markup)
       when :warn
         begin
-          strict_parse_with_error_context(markup)
+          return strict_parse_with_error_context(markup)
         rescue SyntaxError => e
           parse_context.warnings << e
-          lax_parse(markup)
+          return lax_parse(markup)
         end
       end
     end
@@ -21,7 +19,7 @@ module Liquid
     def strict_parse_with_error_context(markup)
       strict_parse(markup)
     rescue SyntaxError => e
-      e.line_number    = line_number
+      e.line_number = line_number
       e.markup_context = markup_context(markup)
       raise e
     end

lib/liquid/partial_cache.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class PartialCache
     def self.load(template_name, context:, parse_context:)
@@ -8,14 +6,10 @@ module Liquid
       return cached if cached
 
       file_system = (context.registers[:file_system] ||= Liquid::Template.file_system)
-      source      = file_system.read_template_file(template_name)
-
+      source = file_system.read_template_file(template_name)
       parse_context.partial = true
 
-      template_factory = (context.registers[:template_factory] ||= Liquid::TemplateFactory.new)
-      template = template_factory.for(template_name)
-
-      partial = template.parse(source, parse_context)
+      partial = Liquid::Template.parse(source, parse_context)
       cached_partials[template_name] = partial
     ensure
       parse_context.partial = false

lib/liquid/profiler.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'liquid/profiler/hooks'
 
 module Liquid
@@ -46,7 +44,7 @@ module Liquid
     include Enumerable
 
     class Timing
-      attr_reader :code, :partial, :line_number, :children, :total_time, :self_time
+      attr_reader :code, :partial, :line_number, :children
 
       def initialize(node, partial)
         @code        = node.respond_to?(:raw) ? node.raw : node
@@ -64,18 +62,7 @@ module Liquid
       end
 
       def finish
-        @end_time   = Time.now
-        @total_time = @end_time - @start_time
-
-        if @children.empty?
-          @self_time = @total_time
-        else
-          total_children_time = 0
-          @children.each do |child|
-            total_children_time += child.total_time
-          end
-          @self_time = @total_time - total_children_time
-        end
+        @end_time = Time.now
       end
 
       def render_time
@@ -109,14 +96,14 @@ module Liquid
       Thread.current[:liquid_profiler]
     end
 
-    def initialize(partial_name = "<root>")
-      @partial_stack = [partial_name]
+    def initialize
+      @partial_stack = ["<root>"]
 
-      @root_timing  = Timing.new("", current_partial)
+      @root_timing = Timing.new("", current_partial)
       @timing_stack = [@root_timing]
 
       @render_start_at = Time.now
-      @render_end_at   = @render_start_at
+      @render_end_at = @render_start_at
     end
 
     def start

lib/liquid/profiler/hooks.rb

@@ -1,21 +1,23 @@
-# frozen_string_literal: true
-
 module Liquid
-  module BlockBodyProfilingHook
-    def render_node(context, output, node)
+  class BlockBody
+    def render_node_with_profiling(context, output, node)
       Profiler.profile_node_render(node) do
-        super
+        render_node_without_profiling(context, output, node)
       end
     end
-  end
-  BlockBody.prepend(BlockBodyProfilingHook)
 
-  module IncludeProfilingHook
-    def render_to_output_buffer(context, output)
+    alias_method :render_node_without_profiling, :render_node
+    alias_method :render_node, :render_node_with_profiling
+  end
+
+  class Include < Tag
+    def render_to_output_buffer_with_profiling(context, output)
       Profiler.profile_children(context.evaluate(@template_name_expr).to_s) do
-        super
+        render_to_output_buffer_without_profiling(context, output)
       end
     end
+
+    alias_method :render_to_output_buffer_without_profiling, :render_to_output_buffer
+    alias_method :render_to_output_buffer, :render_to_output_buffer_with_profiling
   end
-  Include.prepend(IncludeProfilingHook)
 end

lib/liquid/range_lookup.rb

@@ -1,10 +1,8 @@
-# frozen_string_literal: true
-
 module Liquid
   class RangeLookup
     def self.parse(start_markup, end_markup)
       start_obj = Expression.parse(start_markup)
-      end_obj   = Expression.parse(end_markup)
+      end_obj = Expression.parse(end_markup)
       if start_obj.respond_to?(:evaluate) || end_obj.respond_to?(:evaluate)
         new(start_obj, end_obj)
       else
@@ -14,12 +12,12 @@ module Liquid
 
     def initialize(start_obj, end_obj)
       @start_obj = start_obj
-      @end_obj   = end_obj
+      @end_obj = end_obj
     end
 
     def evaluate(context)
       start_int = to_integer(context.evaluate(@start_obj))
-      end_int   = to_integer(context.evaluate(@end_obj))
+      end_int = to_integer(context.evaluate(@end_obj))
       start_int..end_int
     end
 

lib/liquid/register.rb

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

lib/liquid/resource_limits.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class ResourceLimits
     attr_accessor :render_length, :render_score, :assign_score,
@@ -7,8 +5,8 @@ module Liquid
 
     def initialize(limits)
       @render_length_limit = limits[:render_length_limit]
-      @render_score_limit  = limits[:render_score_limit]
-      @assign_score_limit  = limits[:assign_score_limit]
+      @render_score_limit = limits[:render_score_limit]
+      @assign_score_limit = limits[:assign_score_limit]
       reset
     end
 

lib/liquid/standardfilters.rb

@@ -1,19 +1,17 @@
-# frozen_string_literal: true
-
 require 'cgi'
 require 'bigdecimal'
 
 module Liquid
   module StandardFilters
     HTML_ESCAPE = {
-      '&' => '&',
-      '>' => '>',
-      '<' => '&lt;',
-      '"' => '&quot;',
-      "'" => '&#39;',
+      '&'.freeze => '&amp;'.freeze,
+      '>'.freeze => '&gt;'.freeze,
+      '<'.freeze => '&lt;'.freeze,
+      '"'.freeze => '&quot;'.freeze,
+      "'".freeze => '&#39;'.freeze,
     }.freeze
     HTML_ESCAPE_ONCE_REGEXP = /["><']|&(?!([a-zA-Z]+|(#\d+));)/
-    STRIP_HTML_BLOCKS       = Regexp.union(
+    STRIP_HTML_BLOCKS = Regexp.union(
       %r{<script.*?</script>}m,
       /<!--.*?-->/m,
       %r{<style.*?</style>}m
@@ -41,7 +39,7 @@ module Liquid
     end
 
     def escape(input)
-      CGI.escapeHTML(input.to_s) unless input.nil?
+      CGI.escapeHTML(input.to_s).untaint unless input.nil?
     end
     alias_method :h, :escape
 
@@ -74,28 +72,23 @@ module Liquid
     end
 
     # Truncate a string down to x characters
-    def truncate(input, length = 50, truncate_string = "...")
+    def truncate(input, length = 50, truncate_string = "...".freeze)
       return if input.nil?
       input_str = input.to_s
-      length    = Utils.to_integer(length)
-
+      length = Utils.to_integer(length)
       truncate_string_str = truncate_string.to_s
-
       l = length - truncate_string_str.length
       l = 0 if l < 0
-
       input_str.length > length ? input_str[0...l].concat(truncate_string_str) : input_str
     end
 
-    def truncatewords(input, words = 15, truncate_string = "...")
+    def truncatewords(input, words = 15, truncate_string = "...".freeze)
       return if input.nil?
       wordlist = input.to_s.split
-      words    = Utils.to_integer(words)
-
+      words = Utils.to_integer(words)
       l = words - 1
       l = 0 if l < 0
-
-      wordlist.length > l ? wordlist[0..l].join(" ").concat(truncate_string.to_s) : input
+      wordlist.length > l ? wordlist[0..l].join(" ".freeze).concat(truncate_string.to_s) : input
     end
 
     # Split input string into an array of substrings separated by given pattern.
@@ -120,7 +113,7 @@ module Liquid
     end
 
     def strip_html(input)
-      empty  = ''
+      empty = ''.freeze
       result = input.to_s.gsub(STRIP_HTML_BLOCKS, empty)
       result.gsub!(STRIP_HTML_TAGS, empty)
       result
@@ -128,18 +121,18 @@ module Liquid
 
     # Remove all newlines from the string
     def strip_newlines(input)
-      input.to_s.gsub(/\r?\n/, '')
+      input.to_s.gsub(/\r?\n/, ''.freeze)
     end
 
     # Join elements of the array with certain character between them
-    def join(input, glue = ' ')
-      InputIterator.new(input, context).join(glue)
+    def join(input, glue = ' '.freeze)
+      InputIterator.new(input).join(glue)
     end
 
     # Sort elements of the array
     # provide optional property with which to sort an array of hashes or drops
     def sort(input, property = nil)
-      ary = InputIterator.new(input, context)
+      ary = InputIterator.new(input)
 
       return [] if ary.empty?
 
@@ -159,7 +152,7 @@ module Liquid
     # Sort elements of an array ignoring case if strings
     # provide optional property with which to sort an array of hashes or drops
     def sort_natural(input, property = nil)
-      ary = InputIterator.new(input, context)
+      ary = InputIterator.new(input)
 
       return [] if ary.empty?
 
@@ -179,7 +172,7 @@ module Liquid
     # Filter the elements of an array to those with a certain property value.
     # By default the target is any truthy value.
     def where(input, property, target_value = nil)
-      ary = InputIterator.new(input, context)
+      ary = InputIterator.new(input)
 
       if ary.empty?
         []
@@ -201,7 +194,7 @@ module Liquid
     # Remove duplicate elements from an array
     # provide optional property with which to determine uniqueness
     def uniq(input, property = nil)
-      ary = InputIterator.new(input, context)
+      ary = InputIterator.new(input)
 
       if property.nil?
         ary.uniq
@@ -218,16 +211,16 @@ module Liquid
 
     # Reverse the elements of an array
     def reverse(input)
-      ary = InputIterator.new(input, context)
+      ary = InputIterator.new(input)
       ary.reverse
     end
 
     # map/collect on a given property
     def map(input, property)
-      InputIterator.new(input, context).map do |e|
+      InputIterator.new(input).map do |e|
         e = e.call if e.is_a?(Proc)
 
-        if property == "to_liquid"
+        if property == "to_liquid".freeze
           e
         elsif e.respond_to?(:[])
           r = e[property]
@@ -241,7 +234,7 @@ module Liquid
     # Remove nils within an array
     # provide optional property with which to check for nil
     def compact(input, property = nil)
-      ary = InputIterator.new(input, context)
+      ary = InputIterator.new(input)
 
       if property.nil?
         ary.compact
@@ -257,23 +250,23 @@ module Liquid
     end
 
     # Replace occurrences of a string with another
-    def replace(input, string, replacement = '')
+    def replace(input, string, replacement = ''.freeze)
       input.to_s.gsub(string.to_s, replacement.to_s)
     end
 
     # Replace the first occurrences of a string with another
-    def replace_first(input, string, replacement = '')
+    def replace_first(input, string, replacement = ''.freeze)
       input.to_s.sub(string.to_s, replacement.to_s)
     end
 
     # remove a substring
     def remove(input, string)
-      input.to_s.gsub(string.to_s, '')
+      input.to_s.gsub(string.to_s, ''.freeze)
     end
 
     # remove the first occurrences of a substring
     def remove_first(input, string)
-      input.to_s.sub(string.to_s, '')
+      input.to_s.sub(string.to_s, ''.freeze)
     end
 
     # add one string to another
@@ -285,7 +278,7 @@ module Liquid
       unless array.respond_to?(:to_ary)
         raise ArgumentError, "concat filter requires an array argument"
       end
-      InputIterator.new(input, context).concat(array)
+      InputIterator.new(input).concat(array)
     end
 
     # prepend a string to another
@@ -295,7 +288,7 @@ 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(/\n/, "<br />\n".freeze)
     end
 
     # Reformat a date using Ruby's core Time#strftime( string ) -> string
@@ -332,7 +325,7 @@ module Liquid
     def date(input, format)
       return input if format.to_s.empty?
 
-      return input unless (date = Utils.to_date(input))
+      return input unless date = Utils.to_date(input)
 
       date.strftime(format.to_s)
     end
@@ -426,26 +419,17 @@ module Liquid
       result.is_a?(BigDecimal) ? result.to_f : result
     end
 
-    # Set a default value when the input is nil, false or empty
-    #
-    # Example:
-    #    {{ product.title | default: "No Title" }}
-    #
-    # Use `allow_false` when an input should only be tested against nil or empty and not false.
-    #
-    # Example:
-    #    {{ product.title | default: "No Title", allow_false: true }}
-    #
-    def default(input, default_value = '', options = {})
-      options = {} unless options.is_a?(Hash)
-      false_check = options['allow_false'] ? input.nil? : !input
-      false_check || (input.respond_to?(:empty?) && input.empty?) ? default_value : input
+    def default(input, default_value = ''.freeze)
+      if !input || input.respond_to?(:empty?) && input.empty?
+        Usage.increment("default_filter_received_false_value") if input == false # See https://github.com/Shopify/liquid/issues/1127
+        default_value
+      else
+        input
+      end
     end
 
     private
 
-    attr_reader :context
-
     def raise_property_error(property)
       raise Liquid::ArgumentError, "cannot select the property '#{property}'"
     end
@@ -474,9 +458,8 @@ module Liquid
     class InputIterator
       include Enumerable
 
-      def initialize(input, context)
-        @context = context
-        @input   = if input.is_a?(Array)
+      def initialize(input)
+        @input = if input.is_a?(Array)
           input.flatten
         elsif input.is_a?(Hash)
           [input]
@@ -514,7 +497,6 @@ module Liquid
 
       def each
         @input.each do |e|
-          e.context = @context if e.respond_to?(:context=)
           yield(e.respond_to?(:to_liquid) ? e.to_liquid : e)
         end
       end

lib/liquid/static_registers.rb

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

lib/liquid/strainer.rb

@@ -0,0 +1,66 @@
+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

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

lib/liquid/strainer_template.rb

@@ -1,53 +0,0 @@
-# frozen_string_literal: true
-
-require 'set'
-
-module Liquid
-  # StrainerTemplate is the computed class for the filters system.
-  # New filters are mixed into the strainer class which is then instantiated for each liquid template render run.
-  #
-  # The Strainer only allows method calls defined in filters given to it via StrainerFactory.add_global_filter,
-  # Context#add_filters or Template.register_filter
-  class StrainerTemplate
-    def initialize(context)
-      @context = context
-    end
-
-    class << self
-      def add_filter(filter)
-        return if include?(filter)
-
-        invokable_non_public_methods = (filter.private_instance_methods + filter.protected_instance_methods).select { |m| invokable?(m) }
-        if invokable_non_public_methods.any?
-          raise MethodOverrideError, "Filter overrides registered public methods as non public: #{invokable_non_public_methods.join(', ')}"
-        end
-
-        include(filter)
-
-        filter.public_instance_methods.each { |name| filter_methods[name] = true }
-      end
-
-      def invokable?(method)
-        filter_methods.key?(method.to_sym)
-      end
-
-      private
-
-      def filter_methods
-        @filter_methods ||= {}
-      end
-    end
-
-    def invoke(method, *args)
-      if self.class.invokable?(method)
-        send(method, *args)
-      elsif @context.strict_filters
-        raise Liquid::UndefinedFilter, "undefined filter #{method}"
-      else
-        args.first
-      end
-    rescue ::ArgumentError => e
-      raise Liquid::ArgumentError, e.message, e.backtrace
-    end
-  end
-end

lib/liquid/tablerowloop_drop.rb

@@ -1,13 +1,11 @@
-# frozen_string_literal: true
-
 module Liquid
   class TablerowloopDrop < Drop
     def initialize(length, cols)
       @length = length
-      @row    = 1
-      @col    = 1
-      @cols   = cols
-      @index  = 0
+      @row = 1
+      @col = 1
+      @cols = cols
+      @index = 0
     end
 
     attr_reader :length, :col, :row

lib/liquid/tag.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Tag
     attr_reader :nodelist, :tag_name, :line_number, :parse_context
@@ -13,20 +11,14 @@ module Liquid
         tag
       end
 
-      def disable_tags(*tag_names)
-        @disabled_tags ||= []
-        @disabled_tags.concat(tag_names)
-        prepend(Disabler)
-      end
-
       private :new
     end
 
     def initialize(tag_name, markup, parse_context)
-      @tag_name      = tag_name
-      @markup        = markup
+      @tag_name   = tag_name
+      @markup     = markup
       @parse_context = parse_context
-      @line_number   = parse_context.line_number
+      @line_number = parse_context.line_number
     end
 
     def parse(_tokens)
@@ -41,7 +33,7 @@ module Liquid
     end
 
     def render(_context)
-      ''
+      ''.freeze
     end
 
     # For backwards compatibility with custom tags. In a future release, the semantics

lib/liquid/tag/disableable.rb

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

lib/liquid/tag/disabler.rb

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

lib/liquid/tags/assign.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Assign sets a variable in your template.
   #
@@ -12,15 +10,19 @@ module Liquid
   class Assign < Tag
     Syntax = /(#{VariableSignature}+)\s*=\s*(.*)\s*/om
 
+    def self.syntax_error_translation_key
+      "errors.syntax.assign".freeze
+    end
+
     attr_reader :to, :from
 
     def initialize(tag_name, markup, options)
       super
       if markup =~ Syntax
-        @to   = Regexp.last_match(1)
+        @to = Regexp.last_match(1)
         @from = Variable.new(Regexp.last_match(2), options)
       else
-        raise SyntaxError, options[:locale].t('errors.syntax.assign')
+        raise SyntaxError, options[:locale].t(self.class.syntax_error_translation_key)
       end
     end
 
@@ -57,5 +59,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('assign', Assign)
+  Template.register_tag('assign'.freeze, Assign)
 end

lib/liquid/tags/break.rb

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

lib/liquid/tags/capture.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Capture stores the result of a block into a variable without rendering it inplace.
   #
@@ -37,5 +35,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('capture', Capture)
+  Template.register_tag('capture'.freeze, Capture)
 end

lib/liquid/tags/case.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Case < Block
     Syntax     = /(#{QuotedFragment})/o
@@ -14,7 +12,7 @@ module Liquid
       if markup =~ Syntax
         @left = Expression.parse(Regexp.last_match(1))
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.case")
+        raise SyntaxError, options[:locale].t("errors.syntax.case".freeze)
       end
     end
 
@@ -29,9 +27,9 @@ module Liquid
 
     def unknown_tag(tag, markup, tokens)
       case tag
-      when 'when'
+      when 'when'.freeze
         record_when_condition(markup)
-      when 'else'
+      when 'else'.freeze
         record_else_condition(markup)
       else
         super
@@ -60,12 +58,12 @@ module Liquid
 
       while markup
         unless markup =~ WhenSyntax
-          raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_when")
+          raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_when".freeze)
         end
 
         markup = Regexp.last_match(2)
 
-        block = Condition.new(@left, '==', Expression.parse(Regexp.last_match(1)))
+        block = Condition.new(@left, '=='.freeze, Expression.parse(Regexp.last_match(1)))
         block.attach(body)
         @blocks << block
       end
@@ -73,7 +71,7 @@ module Liquid
 
     def record_else_condition(markup)
       unless markup.strip.empty?
-        raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_else")
+        raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_else".freeze)
       end
 
       block = ElseCondition.new
@@ -88,5 +86,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('case', Case)
+  Template.register_tag('case'.freeze, Case)
 end

lib/liquid/tags/comment.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Comment < Block
     def render_to_output_buffer(_context, output)
@@ -14,5 +12,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('comment', Comment)
+  Template.register_tag('comment'.freeze, Comment)
 end

lib/liquid/tags/continue.rb

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

lib/liquid/tags/cycle.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Cycle is usually used within a loop to alternate between values, like colors or DOM classes.
   #
@@ -24,19 +22,19 @@ module Liquid
       case markup
       when NamedSyntax
         @variables = variables_from_string(Regexp.last_match(2))
-        @name      = Expression.parse(Regexp.last_match(1))
+        @name = Expression.parse(Regexp.last_match(1))
       when SimpleSyntax
         @variables = variables_from_string(markup)
-        @name      = @variables.to_s
+        @name = @variables.to_s
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.cycle")
+        raise SyntaxError, options[:locale].t("errors.syntax.cycle".freeze)
       end
     end
 
     def render_to_output_buffer(context, output)
       context.registers[:cycle] ||= {}
 
-      key       = context.evaluate(@name)
+      key = context.evaluate(@name)
       iteration = context.registers[:cycle][key].to_i
 
       val = context.evaluate(@variables[iteration])
@@ -50,9 +48,9 @@ module Liquid
       output << val
 
       iteration += 1
-      iteration = 0 if iteration >= @variables.size
-
+      iteration  = 0 if iteration >= @variables.size
       context.registers[:cycle][key] = iteration
+
       output
     end
 

lib/liquid/tags/decrement.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # decrement is used in a place where one needs to insert a counter
   #     into a template, and needs the counter to survive across
@@ -34,5 +32,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('decrement', Decrement)
+  Template.register_tag('decrement'.freeze, Decrement)
 end

lib/liquid/tags/echo.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Echo outputs an expression
   #
@@ -18,9 +16,9 @@ module Liquid
     end
 
     def render(context)
-      @variable.render_to_output_buffer(context, +'')
+      @variable.render_to_output_buffer(context, '')
     end
   end
 
-  Template.register_tag('echo', Echo)
+  Template.register_tag('echo'.freeze, Echo)
 end

lib/liquid/tags/for.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # "For" iterates over an array or collection.
   # Several useful variables are available to you within the loop.
@@ -68,7 +66,7 @@ module Liquid
     end
 
     def unknown_tag(tag, markup, tokens)
-      return super unless tag == 'else'
+      return super unless tag == 'else'.freeze
       @else_block = BlockBody.new
     end
 
@@ -88,33 +86,31 @@ module Liquid
 
     def lax_parse(markup)
       if markup =~ Syntax
-        @variable_name   = Regexp.last_match(1)
-        collection_name  = Regexp.last_match(2)
-        @reversed        = !!Regexp.last_match(3)
-        @name            = "#{@variable_name}-#{collection_name}"
+        @variable_name = Regexp.last_match(1)
+        collection_name = Regexp.last_match(2)
+        @reversed = !!Regexp.last_match(3)
+        @name = "#{@variable_name}-#{collection_name}"
         @collection_name = Expression.parse(collection_name)
         markup.scan(TagAttributes) do |key, value|
           set_attribute(key, value)
         end
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.for")
+        raise SyntaxError, options[:locale].t("errors.syntax.for".freeze)
       end
     end
 
     def strict_parse(markup)
       p = Parser.new(markup)
       @variable_name = p.consume(:id)
-      raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_in") unless p.id?('in')
-
-      collection_name  = p.expression
+      raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_in".freeze) unless p.id?('in'.freeze)
+      collection_name = p.expression
+      @name = "#{@variable_name}-#{collection_name}"
       @collection_name = Expression.parse(collection_name)
-
-      @name     = "#{@variable_name}-#{collection_name}"
-      @reversed = p.id?('reversed')
+      @reversed = p.id?('reversed'.freeze)
 
       while p.look(:id) && p.look(:colon, 1)
-        unless (attribute = p.id?('limit') || p.id?('offset'))
-          raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_attribute")
+        unless attribute = p.id?('limit'.freeze) || p.id?('offset'.freeze)
+          raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_attribute".freeze)
         end
         p.consume
         set_attribute(attribute, p.expression)
@@ -158,7 +154,7 @@ module Liquid
 
     def render_segment(context, output, segment)
       for_stack = context.registers[:for_stack] ||= []
-      length    = segment.length
+      length = segment.length
 
       context.stack do
         loop_vars = Liquid::ForloopDrop.new(@name, length, for_stack[-1])
@@ -166,7 +162,7 @@ module Liquid
         for_stack.push(loop_vars)
 
         begin
-          context['forloop'] = loop_vars
+          context['forloop'.freeze] = loop_vars
 
           segment.each do |item|
             context[@variable_name] = item
@@ -189,13 +185,13 @@ module Liquid
 
     def set_attribute(key, expr)
       case key
-      when 'offset'
-        @from = if expr == 'continue'
+      when 'offset'.freeze
+        @from = if expr == 'continue'.freeze
           :continue
         else
           Expression.parse(expr)
         end
-      when 'limit'
+      when 'limit'.freeze
         @limit = Expression.parse(expr)
       end
     end
@@ -215,5 +211,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('for', For)
+  Template.register_tag('for'.freeze, For)
 end

lib/liquid/tags/if.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # If is the conditional block
   #
@@ -12,16 +10,16 @@ module Liquid
   #    There are {% if count < 5 %} less {% else %} more {% endif %} items than you need.
   #
   class If < Block
-    Syntax                  = /(#{QuotedFragment})\s*([=!<>a-z_]+)?\s*(#{QuotedFragment})?/o
+    Syntax = /(#{QuotedFragment})\s*([=!<>a-z_]+)?\s*(#{QuotedFragment})?/o
     ExpressionsAndOperators = /(?:\b(?:\s?and\s?|\s?or\s?)\b|(?:\s*(?!\b(?:\s?and\s?|\s?or\s?)\b)(?:#{QuotedFragment}|\S+)\s*)+)/o
-    BOOLEAN_OPERATORS       = %w(and or).freeze
+    BOOLEAN_OPERATORS = %w(and or).freeze
 
     attr_reader :blocks
 
     def initialize(tag_name, markup, options)
       super
       @blocks = []
-      push_block('if', markup)
+      push_block('if'.freeze, markup)
     end
 
     def nodelist
@@ -34,7 +32,7 @@ module Liquid
     end
 
     def unknown_tag(tag, markup, tokens)
-      if ['elsif', 'else'].include?(tag)
+      if ['elsif'.freeze, 'else'.freeze].include?(tag)
         push_block(tag, markup)
       else
         super
@@ -54,7 +52,7 @@ module Liquid
     private
 
     def push_block(tag, markup)
-      block = if tag == 'else'
+      block = if tag == 'else'.freeze
         ElseCondition.new
       else
         parse_with_selected_parser(markup)
@@ -66,17 +64,17 @@ module Liquid
 
     def lax_parse(markup)
       expressions = markup.scan(ExpressionsAndOperators)
-      raise SyntaxError, options[:locale].t("errors.syntax.if") unless expressions.pop =~ Syntax
+      raise SyntaxError, options[:locale].t("errors.syntax.if".freeze) unless expressions.pop =~ Syntax
 
       condition = Condition.new(Expression.parse(Regexp.last_match(1)), Regexp.last_match(2), Expression.parse(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
+        raise SyntaxError, options[:locale].t("errors.syntax.if".freeze) 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)))
-        raise SyntaxError, options[:locale].t("errors.syntax.if") unless BOOLEAN_OPERATORS.include?(operator)
+        raise SyntaxError, options[:locale].t("errors.syntax.if".freeze) unless BOOLEAN_OPERATORS.include?(operator)
         new_condition.send(operator, condition)
         condition = new_condition
       end
@@ -94,7 +92,7 @@ module Liquid
     def parse_binary_comparisons(p)
       condition = parse_comparison(p)
       first_condition = condition
-      while (op = (p.id?('and') || p.id?('or')))
+      while op = (p.id?('and'.freeze) || p.id?('or'.freeze))
         child_condition = parse_comparison(p)
         condition.send(op, child_condition)
         condition = child_condition
@@ -104,7 +102,7 @@ module Liquid
 
     def parse_comparison(p)
       a = Expression.parse(p.expression)
-      if (op = p.consume?(:comparison))
+      if op = p.consume?(:comparison)
         b = Expression.parse(p.expression)
         Condition.new(a, op, b)
       else
@@ -119,5 +117,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('if', If)
+  Template.register_tag('if'.freeze, If)
 end

lib/liquid/tags/ifchanged.rb

@@ -1,9 +1,7 @@
-# frozen_string_literal: true
-
 module Liquid
   class Ifchanged < Block
     def render_to_output_buffer(context, output)
-      block_output = +''
+      block_output = ''
       super(context, block_output)
 
       if block_output != context.registers[:ifchanged]
@@ -15,5 +13,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('ifchanged', Ifchanged)
+  Template.register_tag('ifchanged'.freeze, Ifchanged)
 end

lib/liquid/tags/include.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Include allows templates to relate with other templates
   #
@@ -16,32 +14,28 @@ 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
+    Syntax = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?/o
 
     attr_reader :template_name_expr, :variable_name_expr, :attributes
 
     def initialize(tag_name, markup, options)
       super
 
-      if markup =~ SYNTAX
+      if markup =~ Syntax
 
         template_name = Regexp.last_match(1)
         variable_name = Regexp.last_match(3)
 
-        @alias_name         = Regexp.last_match(5)
         @variable_name_expr = variable_name ? Expression.parse(variable_name) : nil
         @template_name_expr = Expression.parse(template_name)
-        @attributes         = {}
+        @attributes = {}
 
         markup.scan(TagAttributes) do |key, value|
           @attributes[key] = Expression.parse(value)
         end
 
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.include")
+        raise SyntaxError, options[:locale].t("errors.syntax.include".freeze)
       end
     end
 
@@ -58,7 +52,7 @@ module Liquid
         parse_context: parse_context
       )
 
-      context_variable_name = @alias_name || template_name.split('/').last
+      context_variable_name = template_name.split('/'.freeze).last
 
       variable = if @variable_name_expr
         context.evaluate(@variable_name_expr)
@@ -67,10 +61,10 @@ module Liquid
       end
 
       old_template_name = context.template_name
-      old_partial       = context.partial
+      old_partial = context.partial
       begin
         context.template_name = template_name
-        context.partial       = true
+        context.partial = true
         context.stack do
           @attributes.each do |key, value|
             context[key] = context.evaluate(value)
@@ -88,7 +82,7 @@ module Liquid
         end
       ensure
         context.template_name = old_template_name
-        context.partial       = old_partial
+        context.partial = old_partial
       end
 
       output
@@ -107,5 +101,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('include', Include)
+  Template.register_tag('include'.freeze, Include)
 end

lib/liquid/tags/increment.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # increment is used in a place where one needs to insert a counter
   #     into a template, and needs the counter to survive across
@@ -31,5 +29,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('increment', Increment)
+  Template.register_tag('increment'.freeze, Increment)
 end

lib/liquid/tags/raw.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class Raw < Block
     Syntax = /\A\s*\z/
@@ -12,16 +10,16 @@ module Liquid
     end
 
     def parse(tokens)
-      @body = +''
-      while (token = tokens.shift)
+      @body = ''
+      while token = tokens.shift
         if token =~ FullTokenPossiblyInvalid
-          @body << Regexp.last_match(1) if Regexp.last_match(1) != ""
+          @body << Regexp.last_match(1) if Regexp.last_match(1) != "".freeze
           return if block_delimiter == Regexp.last_match(2)
         end
         @body << token unless token.empty?
       end
 
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
+      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed".freeze, block_name: block_name)
     end
 
     def render_to_output_buffer(_context, output)
@@ -40,11 +38,11 @@ module Liquid
     protected
 
     def ensure_valid_markup(tag_name, markup, parse_context)
-      unless Syntax.match?(markup)
-        raise SyntaxError, parse_context.locale.t("errors.syntax.tag_unexpected_args", tag: tag_name)
+      unless markup =~ Syntax
+        raise SyntaxError, parse_context.locale.t("errors.syntax.tag_unexpected_args".freeze, tag: tag_name)
       end
     end
   end
 
-  Template.register_tag('raw', Raw)
+  Template.register_tag('raw'.freeze, Raw)
 end

lib/liquid/tags/render.rb

@@ -1,27 +1,17 @@
-# frozen_string_literal: true
-
 module Liquid
   class Render < Tag
-    FOR = 'for'
-    SYNTAX = /(#{QuotedString}+)(\s+(with|#{FOR})\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o
-
-    disable_tags "include"
+    SYNTAX = /(#{QuotedString})#{QuotedFragment}*/o
 
     attr_reader :template_name_expr, :attributes
 
     def initialize(tag_name, markup, options)
       super
 
-      raise SyntaxError, options[:locale].t("errors.syntax.render") unless markup =~ SYNTAX
+      raise SyntaxError, options[:locale].t("errors.syntax.render".freeze) unless markup =~ SYNTAX
 
       template_name = Regexp.last_match(1)
-      with_or_for = Regexp.last_match(3)
-      variable_name = Regexp.last_match(4)
 
-      @alias_name = Regexp.last_match(6)
-      @variable_name_expr = variable_name ? Expression.parse(variable_name) : nil
       @template_name_expr = Expression.parse(template_name)
-      @for = (with_or_for == FOR)
 
       @attributes = {}
       markup.scan(TagAttributes) do |key, value|
@@ -30,10 +20,6 @@ module Liquid
     end
 
     def render_to_output_buffer(context, output)
-      render_tag(context, output)
-    end
-
-    def render_tag(context, output)
       # Though we evaluate this here we will only ever parse it as a string literal.
       template_name = context.evaluate(@template_name_expr)
       raise ArgumentError, options[:locale].t("errors.argument.include") unless template_name
@@ -44,29 +30,13 @@ module Liquid
         parse_context: parse_context
       )
 
-      context_variable_name = @alias_name || template_name.split('/').last
-
-      render_partial_func = ->(var, forloop) {
-        inner_context               = context.new_isolated_subcontext
-        inner_context.template_name = template_name
-        inner_context.partial       = true
-        inner_context['forloop']    = forloop if forloop
-
-        @attributes.each do |key, value|
-          inner_context[key] = context.evaluate(value)
-        end
-        inner_context[context_variable_name] = var unless var.nil?
-        partial.render_to_output_buffer(inner_context, output)
-        forloop&.send(:increment!)
-      }
-
-      variable = @variable_name_expr ? context.evaluate(@variable_name_expr) : nil
-      if @for && variable.respond_to?(:each) && variable.respond_to?(:count)
-        forloop = Liquid::ForloopDrop.new(template_name, variable.count, nil)
-        variable.each { |var| render_partial_func.call(var, forloop) }
-      else
-        render_partial_func.call(variable, nil)
+      inner_context = context.new_isolated_subcontext
+      inner_context.template_name = template_name
+      inner_context.partial = true
+      @attributes.each do |key, value|
+        inner_context[key] = context.evaluate(value)
       end
+      partial.render_to_output_buffer(inner_context, output)
 
       output
     end
@@ -80,5 +50,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('render', Render)
+  Template.register_tag('render'.freeze, Render)
 end

lib/liquid/tags/table_row.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   class TableRow < Block
     Syntax = /(\w+)\s+in\s+(#{QuotedFragment}+)/o
@@ -9,32 +7,33 @@ module Liquid
     def initialize(tag_name, markup, options)
       super
       if markup =~ Syntax
-        @variable_name   = Regexp.last_match(1)
+        @variable_name = Regexp.last_match(1)
         @collection_name = Expression.parse(Regexp.last_match(2))
-        @attributes      = {}
+        @attributes = {}
         markup.scan(TagAttributes) do |key, value|
           @attributes[key] = Expression.parse(value)
         end
       else
-        raise SyntaxError, options[:locale].t("errors.syntax.table_row")
+        raise SyntaxError, options[:locale].t("errors.syntax.table_row".freeze)
       end
     end
 
     def render_to_output_buffer(context, output)
-      (collection = context.evaluate(@collection_name)) || (return '')
+      (collection = context.evaluate(@collection_name)) || (return ''.freeze)
 
-      from = @attributes.key?('offset') ? context.evaluate(@attributes['offset']).to_i : 0
-      to   = @attributes.key?('limit')  ? from + context.evaluate(@attributes['limit']).to_i : nil
+      from = @attributes.key?('offset'.freeze) ? context.evaluate(@attributes['offset'.freeze]).to_i : 0
+      to = @attributes.key?('limit'.freeze) ? from + context.evaluate(@attributes['limit'.freeze]).to_i : nil
 
       collection = Utils.slice_collection(collection, from, to)
-      length     = collection.length
 
-      cols = context.evaluate(@attributes['cols']).to_i
+      length = collection.length
+
+      cols = context.evaluate(@attributes['cols'.freeze]).to_i
 
       output << "<tr class=\"row1\">\n"
       context.stack do
         tablerowloop = Liquid::TablerowloopDrop.new(length, cols)
-        context['tablerowloop'] = tablerowloop
+        context['tablerowloop'.freeze] = tablerowloop
 
         collection.each do |item|
           context[@variable_name] = item
@@ -62,5 +61,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('tablerow', TableRow)
+  Template.register_tag('tablerow'.freeze, TableRow)
 end

lib/liquid/tags/unless.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require_relative 'if'
 
 module Liquid
@@ -26,5 +24,5 @@ module Liquid
     end
   end
 
-  Template.register_tag('unless', Unless)
+  Template.register_tag('unless'.freeze, Unless)
 end

lib/liquid/template.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Templates are central to liquid.
   # Interpretating templates is a two step process. First you compile the
@@ -18,11 +16,13 @@ module Liquid
     attr_accessor :root
     attr_reader :resource_limits, :warnings
 
+    @@file_system = BlankFileSystem.new
+
     class TagRegistry
       include Enumerable
 
       def initialize
-        @tags  = {}
+        @tags = {}
         @cache = {}
       end
 
@@ -61,57 +61,76 @@ 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_accessor :error_mode
-      Template.error_mode = :lax
+      attr_writer :error_mode
+
+      # Sets how strict the taint checker should be.
+      # :lax is the default, and ignores the taint flag completely
+      # :warn adds a warning, but does not interrupt the rendering
+      # :error raises an error when tainted output is used
+      attr_writer :taint_mode
 
       attr_accessor :default_exception_renderer
       Template.default_exception_renderer = lambda do |exception|
         exception
       end
 
-      attr_accessor :file_system
-      Template.file_system = BlankFileSystem.new
+      def file_system
+        @@file_system
+      end
 
-      attr_accessor :tags
-      Template.tags = TagRegistry.new
-      private :tags=
+      def file_system=(obj)
+        @@file_system = obj
+      end
 
       def register_tag(name, klass)
         tags[name.to_s] = klass
       end
 
+      def tags
+        @tags ||= TagRegistry.new
+      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)
-        StrainerFactory.add_global_filter(mod)
+        Strainer.global_filter(mod)
       end
 
-      attr_accessor :default_resource_limits
-      Template.default_resource_limits = {}
-      private :default_resource_limits=
+      def default_resource_limits
+        @default_resource_limits ||= {}
+      end
 
       # creates a new <tt>Template</tt> object from liquid source code
       # To enable profiling, pass in <tt>profile: true</tt> as an option.
       # See Liquid::Profiler for more information
       def parse(source, options = {})
-        new.parse(source, options)
+        template = Template.new
+        template.parse(source, options)
       end
     end
 
     def initialize
-      @rethrow_errors  = false
-      @resource_limits = ResourceLimits.new(Template.default_resource_limits)
+      @rethrow_errors = false
+      @resource_limits = ResourceLimits.new(self.class.default_resource_limits)
     end
 
     # Parse source code.
     # Returns self for easy chaining
     def parse(source, options = {})
-      @options      = options
-      @profiling    = options[:profile]
+      @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
+      @root = Document.parse(tokenize(source), parse_context)
+      @warnings = parse_context.warnings
       self
     end
 
@@ -124,7 +143,12 @@ module Liquid
     end
 
     def instance_assigns
-      @instance_assigns ||= {}
+      @instance_assigns ||= []
+    end
+
+    def new_outer_scope
+      @instance_assigns.unshift(last = {})
+      last
     end
 
     def errors
@@ -146,7 +170,7 @@ module Liquid
     #    filters and tags and might be useful to integrate liquid more with its host application
     #
     def render(*args)
-      return '' if @root.nil?
+      return ''.freeze if @root.nil?
 
       context = case args.first
       when Liquid::Context
@@ -158,28 +182,24 @@ module Liquid
 
         c
       when Liquid::Drop
-        drop         = args.shift
-        drop.context = Context.new([drop, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
+        drop = args.shift
+        drop.context = Context.new([drop, assigns].concat(instance_assigns), new_outer_scope, registers, @rethrow_errors, @resource_limits)
       when Hash
-        Context.new([args.shift, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
+        Context.new([args.shift, assigns].concat(instance_assigns), new_outer_scope, registers, @rethrow_errors, @resource_limits)
       when nil
-        Context.new(assigns, instance_assigns, registers, @rethrow_errors, @resource_limits)
+        Context.new([assigns].concat(instance_assigns), new_outer_scope, registers, @rethrow_errors, @resource_limits)
       else
         raise ArgumentError, "Expected Hash or Liquid::Context as parameter"
       end
 
       output = nil
 
-      context_register = context.registers.is_a?(StaticRegisters) ? context.registers.static : context.registers
-
       case args.last
       when Hash
         options = args.pop
-        output  = options[:output] if options[:output]
+        output = options[:output] if options[:output]
 
-        options[:registers]&.each do |key, register|
-          context_register[key] = register
-        end
+        registers.merge!(options[:registers]) if options[:registers].is_a?(Hash)
 
         apply_options_to_context(context, options)
       when Module, Array
@@ -193,7 +213,7 @@ module Liquid
         # 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 || +'')
+          @root.render_to_output_buffer(context, output || '')
         end
       rescue Liquid::MemoryError => e
         context.handle_error(e)
@@ -221,7 +241,7 @@ module Liquid
       if @profiling && !context.partial
         raise "Profiler not loaded, require 'liquid/profiler' first" unless defined?(Liquid::Profiler)
 
-        @profiler = Profiler.new(context.template_name)
+        @profiler = Profiler.new
         @profiler.start
 
         begin
@@ -236,10 +256,10 @@ module Liquid
 
     def apply_options_to_context(context, options)
       context.add_filters(options[:filters]) if options[:filters]
-      context.global_filter      = options[:global_filter] if options[:global_filter]
+      context.global_filter = options[:global_filter] if options[:global_filter]
       context.exception_renderer = options[:exception_renderer] if options[:exception_renderer]
-      context.strict_variables   = options[:strict_variables] if options[:strict_variables]
-      context.strict_filters     = options[:strict_filters] if options[:strict_filters]
+      context.strict_variables = options[:strict_variables] if options[:strict_variables]
+      context.strict_filters = options[:strict_filters] if options[:strict_filters]
     end
   end
 end

lib/liquid/template_factory.rb

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

lib/liquid/tokenizer.rb

@@ -1,14 +1,12 @@
-# frozen_string_literal: true
-
 module Liquid
   class Tokenizer
     attr_reader :line_number, :for_liquid_tag
 
     def initialize(source, line_numbers = false, line_number: nil, for_liquid_tag: false)
-      @source         = source
-      @line_number    = line_number || (line_numbers ? 1 : nil)
+      @source = source
+      @line_number = line_number || (line_numbers ? 1 : nil)
       @for_liquid_tag = for_liquid_tag
-      @tokens         = tokenize
+      @tokens = tokenize
     end
 
     def shift

lib/liquid/usage.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   module Usage
     def self.increment(name)

lib/liquid/utils.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   module Utils
     def self.slice_collection(collection, from, to)
@@ -12,7 +10,7 @@ module Liquid
 
     def self.slice_collection_using_each(collection, from, to)
       segments = []
-      index    = 0
+      index = 0
 
       # Maintains Ruby 1.8.7 String#each behaviour on 1.9
       if collection.is_a?(String)
@@ -52,7 +50,7 @@ module Liquid
       when Numeric
         obj
       when String
-        /\A-?\d+\.\d+\z/.match?(obj.strip) ? BigDecimal(obj) : obj.to_i
+        obj.strip =~ /\A-?\d+\.\d+\z/ ? BigDecimal(obj) : obj.to_i
       else
         if obj.respond_to?(:to_number)
           obj.to_number
@@ -71,7 +69,7 @@ module Liquid
       end
 
       case obj
-      when 'now', 'today'
+      when 'now'.freeze, 'today'.freeze
         Time.now
       when /\A\d+\z/, Integer
         Time.at(obj.to_i)

lib/liquid/variable.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module Liquid
   # Holds variables. Variables are only loaded "just in time"
   # and are not evaluated as part of the render stage
@@ -12,10 +10,10 @@ module Liquid
   #   {{ user | link }}
   #
   class Variable
-    FilterMarkupRegex        = /#{FilterSeparator}\s*(.*)/om
-    FilterParser             = /(?:\s+|#{QuotedFragment}|#{ArgumentSeparator})+/o
-    FilterArgsRegex          = /(?:#{FilterArgumentSeparator}|#{ArgumentSeparator})\s*((?:\w+\s*\:\s*)?#{QuotedFragment})/o
-    JustTagAttributes        = /\A#{TagAttributes}\z/o
+    FilterMarkupRegex = /#{FilterSeparator}\s*(.*)/om
+    FilterParser = /(?:\s+|#{QuotedFragment}|#{ArgumentSeparator})+/o
+    FilterArgsRegex = /(?:#{FilterArgumentSeparator}|#{ArgumentSeparator})\s*((?:\w+\s*\:\s*)?#{QuotedFragment})/o
+    JustTagAttributes = /\A#{TagAttributes}\z/o
     MarkupWithQuotedFragment = /(#{QuotedFragment})(.*)/om
 
     attr_accessor :filters, :name, :line_number
@@ -25,10 +23,10 @@ module Liquid
     include ParserSwitching
 
     def initialize(markup, parse_context)
-      @markup        = markup
-      @name          = nil
+      @markup  = markup
+      @name    = nil
       @parse_context = parse_context
-      @line_number   = parse_context.line_number
+      @line_number = parse_context.line_number
 
       parse_with_selected_parser(markup)
     end
@@ -45,9 +43,9 @@ module Liquid
       @filters = []
       return unless markup =~ MarkupWithQuotedFragment
 
-      name_markup   = Regexp.last_match(1)
+      name_markup = Regexp.last_match(1)
       filter_markup = Regexp.last_match(2)
-      @name         = Expression.parse(name_markup)
+      @name = Expression.parse(name_markup)
       if filter_markup =~ FilterMarkupRegex
         filters = Regexp.last_match(1).scan(FilterParser)
         filters.each do |f|
@@ -86,7 +84,9 @@ module Liquid
         context.invoke(filter_name, output, *filter_args)
       end
 
-      context.apply_global_filter(obj)
+      obj = context.apply_global_filter(obj)
+      taint_check(context, obj)
+      obj
     end
 
     def render_to_output_buffer(context, output)
@@ -102,28 +102,20 @@ module Liquid
       output
     end
 
-    def disabled?(_context)
-      false
-    end
-
-    def disabled_tags
-      []
-    end
-
     private
 
     def parse_filter_expressions(filter_name, unparsed_args)
-      filter_args  = []
+      filter_args = []
       keyword_args = nil
       unparsed_args.each do |a|
-        if (matches = a.match(JustTagAttributes))
-          keyword_args           ||= {}
+        if matches = a.match(JustTagAttributes)
+          keyword_args ||= {}
           keyword_args[matches[1]] = Expression.parse(matches[2])
         else
           filter_args << Expression.parse(a)
         end
       end
-      result = [filter_name.to_sym, filter_args]
+      result = [filter_name, filter_args]
       result << keyword_args if keyword_args
       result
     end
@@ -140,6 +132,25 @@ 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/variable_lookup.rb

@@ -1,9 +1,7 @@
-# frozen_string_literal: true
-
 module Liquid
   class VariableLookup
     SQUARE_BRACKETED = /\A\[(.*)\]\z/m
-    COMMAND_METHODS  = ['size', 'first', 'last'].freeze
+    COMMAND_METHODS = ['size'.freeze, 'first'.freeze, 'last'.freeze].freeze
 
     attr_reader :name, :lookups
 
@@ -20,7 +18,7 @@ module Liquid
       end
       @name = name
 
-      @lookups       = lookups
+      @lookups = lookups
       @command_flags = 0
 
       @lookups.each_index do |i|
@@ -34,7 +32,7 @@ module Liquid
     end
 
     def evaluate(context)
-      name   = context.evaluate(@name)
+      name = context.evaluate(@name)
       object = context.find_variable(name)
 
       @lookups.each_index do |i|
@@ -47,7 +45,7 @@ module Liquid
              (object.respond_to?(:fetch) && key.is_a?(Integer)))
 
           # if its a proc we will replace the entry with the proc
-          res    = context.lookup_and_evaluate(object, key)
+          res = context.lookup_and_evaluate(object, key)
           object = res.to_liquid
 
           # Some special cases. If the part wasn't in square brackets and

lib/liquid/version.rb

@@ -1,6 +1,5 @@
 # encoding: utf-8
-# frozen_string_literal: true
 
 module Liquid
-  VERSION = "4.0.3"
+  VERSION = "4.0.3".freeze
 end

liquid.gemspec

@@ -1,5 +1,4 @@
 # encoding: utf-8
-# frozen_string_literal: true
 
 lib = File.expand_path('../lib/', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
@@ -27,6 +26,6 @@ Gem::Specification.new do |s|
 
   s.require_path = "lib"
 
-  s.add_development_dependency('rake', '~> 13.0')
+  s.add_development_dependency('rake', '~> 11.3')
   s.add_development_dependency('minitest')
 end

performance/benchmark.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'benchmark/ips'
 require_relative 'theme_runner'
 
@@ -7,7 +5,7 @@ Liquid::Template.error_mode = ARGV.first.to_sym if ARGV.first
 profiler = ThemeRunner.new
 
 Benchmark.ips do |x|
-  x.time   = 10
+  x.time = 10
   x.warmup = 5
 
   puts

performance/memory_profile.rb

@@ -21,8 +21,8 @@ class Profiler
   end
 
   def profile(phase, &block)
-    print(LOG_LABEL)
-    print("#{phase}.. ".ljust(10))
+    print LOG_LABEL
+    print "#{phase}.. ".ljust(10)
     report = MemoryProfiler.report(&block)
     puts 'Done.'
     @headings  << phase.capitalize

performance/profile.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'stackprof'
 require_relative 'theme_runner'
 
@@ -15,7 +13,7 @@ profiler.run
     end
   end
 
-  if profile_type == :cpu && (graph_filename = ENV['GRAPH_FILENAME'])
+  if profile_type == :cpu && graph_filename = ENV['GRAPH_FILENAME']
     File.open(graph_filename, 'w') do |f|
       StackProf::Report.new(results).print_graphviz(nil, f)
     end

performance/shopify/comment_form.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class CommentForm < Liquid::Block
   Syntax = /(#{Liquid::VariableSignature}+)/
 
@@ -8,7 +6,7 @@ class CommentForm < Liquid::Block
 
     if markup =~ Syntax
       @variable_name = Regexp.last_match(1)
-      @attributes    = {}
+      @attributes = {}
     else
       raise SyntaxError, "Syntax Error in 'comment_form' - Valid syntax: comment_form [article]"
     end

performance/shopify/database.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'yaml'
 
 module Database
@@ -32,8 +30,8 @@ module Database
       db['article']    = db['blog']['articles'].first
 
       db['cart']       = {
-        'total_price' => db['line_items'].values.inject(0) { |sum, item| sum + item['line_price'] * item['quantity'] },
-        'item_count' => db['line_items'].values.inject(0) { |sum, item| sum + item['quantity'] },
+        'total_price' => db['line_items'].values.inject(0) { |sum, item| sum += item['line_price'] * item['quantity'] },
+        'item_count' => db['line_items'].values.inject(0) { |sum, item| sum += item['quantity'] },
         'items' => db['line_items'].values,
       }
 

performance/shopify/json_filter.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'json'
 
 module JsonFilter

performance/shopify/liquid.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 $LOAD_PATH.unshift(__dir__ + '/../../lib')
 require_relative '../../lib/liquid'
 

performance/shopify/money_filter.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module MoneyFilter
   def money_with_currency(money)
     return '' if money.nil?

performance/shopify/paginate.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class Paginate < Liquid::Block
   Syntax = /(#{Liquid::QuotedFragment})\s*(by\s*(\d+))?/
 
@@ -8,7 +6,7 @@ class Paginate < Liquid::Block
 
     if markup =~ Syntax
       @collection_name = Regexp.last_match(1)
-      @page_size       = if Regexp.last_match(2)
+      @page_size = if Regexp.last_match(2)
         Regexp.last_match(3).to_i
       else
         20

performance/shopify/shop_filter.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module ShopFilter
   def asset_url(input)
     "/files/1/[shop_id]/[shop_id]/assets/#{input}"
@@ -31,7 +29,7 @@ module ShopFilter
 
   def link_to_vendor(vendor)
     if vendor
-      link_to(vendor, url_for_vendor(vendor), vendor)
+      link_to vendor, url_for_vendor(vendor), vendor
     else
       'Unknown Vendor'
     end
@@ -39,7 +37,7 @@ module ShopFilter
 
   def link_to_type(type)
     if type
-      link_to(type, url_for_type(type), type)
+      link_to type, url_for_type(type), type
     else
       'Unknown Vendor'
     end
@@ -60,7 +58,7 @@ module ShopFilter
 
     case style
     when 'original'
-      '/files/shops/random_number/' + url
+      return '/files/shops/random_number/' + url
     when 'grande', 'large', 'medium', 'compact', 'small', 'thumb', 'icon'
       "/files/shops/random_number/products/#{Regexp.last_match(1)}_#{style}.#{Regexp.last_match(2)}"
     else

performance/shopify/tag_filter.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module TagFilter
   def link_to_tag(label, tag)
     "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tag}\">#{label}</a>"

performance/shopify/weight_filter.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 module WeightFilter
   def weight(grams)
     format("%.2f", grams / 1000)

performance/theme_runner.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This profiler run simulates Shopify.
 # We are looking in the tests directory for liquid files and render them within the designated layout file.
 # We will also export a substantial database to liquid which the templates can render values of.
@@ -58,9 +56,9 @@ class ThemeRunner
   # `render` is called to benchmark just the render portion of liquid
   def render
     @compiled_tests.each do |test|
-      tmpl    = test[:tmpl]
+      tmpl = test[:tmpl]
       assigns = test[:assigns]
-      layout  = test[:layout]
+      layout = test[:layout]
 
       if layout
         assigns['content_for_layout'] = tmpl.render!(assigns)
@@ -74,7 +72,7 @@ class ThemeRunner
   private
 
   def compile_and_render(template, layout, assigns, page_template, template_file)
-    compiled_test                 = compile_test(template, layout, assigns, page_template, template_file)
+    compiled_test = compile_test(template, layout, assigns, page_template, template_file)
     assigns['content_for_layout'] = compiled_test[:tmpl].render!(assigns)
     compiled_test[:layout].render!(assigns) if layout
   end
@@ -88,7 +86,7 @@ class ThemeRunner
   end
 
   def compile_test(template, layout, assigns, page_template, template_file)
-    tmpl            = init_template(page_template, template_file)
+    tmpl = init_template(page_template, template_file)
     parsed_template = tmpl.parse(template).dup
 
     if layout
@@ -113,9 +111,9 @@ class ThemeRunner
 
   # set up a new Liquid::Template object for use in `compile_and_render` and `compile_test`
   def init_template(page_template, template_file)
-    tmpl                         = Liquid::Template.new
-    tmpl.assigns['page_title']   = 'Page title'
-    tmpl.assigns['template']     = page_template
+    tmpl = Liquid::Template.new
+    tmpl.assigns['page_title'] = 'Page title'
+    tmpl.assigns['template'] = page_template
     tmpl.registers[:file_system] = ThemeRunner::FileSystem.new(File.dirname(template_file))
     tmpl
   end

test/integration/assign_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class AssignTest < Minitest::Test
@@ -10,9 +8,9 @@ class AssignTest < Minitest::Test
     {% assign this-thing = 'Print this-thing' %}
     {{ this-thing }}
     END_TEMPLATE
-    template        = Template.parse(template_source)
-    rendered        = template.render!
-    assert_equal("Print this-thing", rendered.strip)
+    template = Template.parse(template_source)
+    rendered = template.render!
+    assert_equal "Print this-thing", rendered.strip
   end
 
   def test_assigned_variable

test/integration/blank_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class FoobarTag < Liquid::Tag
@@ -96,9 +94,9 @@ class BlankTest < Minitest::Test
 
   def test_include_is_blank
     Liquid::Template.file_system = BlankTestFileSystem.new
-    assert_template_result("foobar" * (N + 1), wrap("{% include 'foobar' %}"))
-    assert_template_result(" foobar " * (N + 1), wrap("{% include ' foobar ' %}"))
-    assert_template_result("   " * (N + 1), wrap(" {% include ' ' %} "))
+    assert_template_result "foobar" * (N + 1), wrap("{% include 'foobar' %}")
+    assert_template_result " foobar " * (N + 1), wrap("{% include ' foobar ' %}")
+    assert_template_result "   " * (N + 1), wrap(" {% include ' ' %} ")
   end
 
   def test_case_is_blank

test/integration/block_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class BlockTest < Minitest::Test
@@ -9,6 +7,6 @@ class BlockTest < Minitest::Test
     exc = assert_raises(SyntaxError) do
       Template.parse("{% if true %}{% endunless %}")
     end
-    assert_equal(exc.message, "Liquid syntax error: 'endunless' is not a valid delimiter for if tags. use endif")
+    assert_equal exc.message, "Liquid syntax error: 'endunless' is not a valid delimiter for if tags. use endif"
   end
 end

test/integration/capture_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class CaptureTest < Minitest::Test
@@ -14,9 +12,9 @@ class CaptureTest < Minitest::Test
     {% capture this-thing %}Print this-thing{% endcapture %}
     {{ this-thing }}
     END_TEMPLATE
-    template        = Template.parse(template_source)
-    rendered        = template.render!
-    assert_equal("Print this-thing", rendered.strip)
+    template = Template.parse(template_source)
+    rendered = template.render!
+    assert_equal "Print this-thing", rendered.strip
   end
 
   def test_capture_to_variable_from_outer_scope_if_existing
@@ -30,9 +28,9 @@ class CaptureTest < Minitest::Test
     {% endif %}
     {{var}}
     END_TEMPLATE
-    template        = Template.parse(template_source)
-    rendered        = template.render!
-    assert_equal("test-string", rendered.gsub(/\s/, ''))
+    template = Template.parse(template_source)
+    rendered = template.render!
+    assert_equal "test-string", rendered.gsub(/\s/, '')
   end
 
   def test_assigning_from_capture
@@ -45,8 +43,8 @@ class CaptureTest < Minitest::Test
     {% endfor %}
     {{ first }}-{{ second }}
     END_TEMPLATE
-    template        = Template.parse(template_source)
-    rendered        = template.render!
-    assert_equal("3-3", rendered.gsub(/\s/, ''))
+    template = Template.parse(template_source)
+    rendered = template.render!
+    assert_equal "3-3", rendered.gsub(/\s/, '')
   end
 end # CaptureTest

test/integration/context_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class ContextTest < Minitest::Test

test/integration/document_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class DocumentTest < Minitest::Test
@@ -9,13 +7,13 @@ class DocumentTest < Minitest::Test
     exc = assert_raises(SyntaxError) do
       Template.parse("{% else %}")
     end
-    assert_equal(exc.message, "Liquid syntax error: Unexpected outer 'else' tag")
+    assert_equal exc.message, "Liquid syntax error: Unexpected outer 'else' tag"
   end
 
   def test_unknown_tag
     exc = assert_raises(SyntaxError) do
       Template.parse("{% foo %}")
     end
-    assert_equal(exc.message, "Liquid syntax error: Unknown tag 'foo'")
+    assert_equal exc.message, "Liquid syntax error: Unknown tag 'foo'"
   end
 end

test/integration/drop_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class ContextDrop < Liquid::Drop
@@ -33,7 +31,7 @@ class ProductDrop < Liquid::Drop
 
   class CatchallDrop < Liquid::Drop
     def liquid_method_missing(method)
-      "catchall_method: #{method}"
+      'catchall_method: ' << method.to_s
     end
   end
 
@@ -49,6 +47,10 @@ class ProductDrop < Liquid::Drop
     ContextDrop.new
   end
 
+  def user_input
+    "foo".taint
+  end
+
   protected
 
   def callmenot
@@ -107,61 +109,82 @@ class DropsTest < Minitest::Test
 
   def test_product_drop
     tpl = Liquid::Template.parse('  ')
-    assert_equal('  ', tpl.render!('product' => ProductDrop.new))
+    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))
-    assert_equal("", Liquid::Template.parse("{{ product.whatever }}").render!('product' => ProductDrop.new))
-    assert_equal("", Liquid::Template.parse('{{ product | map: "inspect" }}').render!('product' => ProductDrop.new))
-    assert_equal("", Liquid::Template.parse('{{ product | map: "pretty_inspect" }}').render!('product' => ProductDrop.new))
-    assert_equal("", Liquid::Template.parse('{{ product | map: "whatever" }}').render!('product' => ProductDrop.new))
+    assert_equal "", Liquid::Template.parse("{{ product.inspect }}").render!('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse("{{ product.pretty_inspect }}").render!('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse("{{ product.whatever }}").render!('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse('{{ product | map: "inspect" }}').render!('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse('{{ product | map: "pretty_inspect" }}').render!('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse('{{ product | map: "whatever" }}').render!('product' => ProductDrop.new)
   end
 
   def test_drops_respond_to_to_liquid
-    assert_equal("text1", Liquid::Template.parse("{{ product.to_liquid.texts.text }}").render!('product' => ProductDrop.new))
-    assert_equal("text1", Liquid::Template.parse('{{ product | map: "to_liquid" | map: "texts" | map: "text" }}').render!('product' => ProductDrop.new))
+    assert_equal "text1", Liquid::Template.parse("{{ product.to_liquid.texts.text }}").render!('product' => ProductDrop.new)
+    assert_equal "text1", Liquid::Template.parse('{{ product | map: "to_liquid" | map: "texts" | map: "text" }}').render!('product' => ProductDrop.new)
   end
 
   def test_text_drop
     output = Liquid::Template.parse(' {{ product.texts.text }} ').render!('product' => ProductDrop.new)
-    assert_equal(' text1 ', output)
+    assert_equal ' text1 ', output
   end
 
   def test_catchall_unknown_method
     output = Liquid::Template.parse(' {{ product.catchall.unknown }} ').render!('product' => ProductDrop.new)
-    assert_equal(' catchall_method: unknown ', output)
+    assert_equal ' catchall_method: unknown ', output
   end
 
   def test_catchall_integer_argument_drop
     output = Liquid::Template.parse(' {{ product.catchall[8] }} ').render!('product' => ProductDrop.new)
-    assert_equal(' catchall_method: 8 ', output)
+    assert_equal ' catchall_method: 8 ', output
   end
 
   def test_text_array_drop
     output = Liquid::Template.parse('{% for text in product.texts.array %} {{text}} {% endfor %}').render!('product' => ProductDrop.new)
-    assert_equal(' text1  text2 ', output)
+    assert_equal ' text1  text2 ', output
   end
 
   def test_context_drop
     output = Liquid::Template.parse(' {{ context.bar }} ').render!('context' => ContextDrop.new, 'bar' => "carrot")
-    assert_equal(' carrot ', output)
-  end
-
-  def test_context_drop_array_with_map
-    output = Liquid::Template.parse(' {{ contexts | map: "bar" }} ').render!('contexts' => [ContextDrop.new, ContextDrop.new], 'bar' => "carrot")
-    assert_equal(' carrotcarrot ', output)
+    assert_equal ' carrot ', output
   end
 
   def test_nested_context_drop
     output = Liquid::Template.parse(' {{ product.context.foo }} ').render!('product' => ProductDrop.new, 'foo' => "monkey")
-    assert_equal(' monkey ', output)
+    assert_equal ' monkey ', output
   end
 
   def test_protected
     output = Liquid::Template.parse(' {{ product.callmenot }} ').render!('product' => ProductDrop.new)
-    assert_equal('  ', output)
+    assert_equal '  ', output
   end
 
   def test_object_methods_not_allowed
@@ -172,40 +195,40 @@ class DropsTest < Minitest::Test
   end
 
   def test_scope
-    assert_equal('1', Liquid::Template.parse('{{ context.scopes }}').render!('context' => ContextDrop.new))
-    assert_equal('2', Liquid::Template.parse('{%for i in dummy%}{{ context.scopes }}{%endfor%}').render!('context' => ContextDrop.new, 'dummy' => [1]))
-    assert_equal('3', Liquid::Template.parse('{%for i in dummy%}{%for i in dummy%}{{ context.scopes }}{%endfor%}{%endfor%}').render!('context' => ContextDrop.new, 'dummy' => [1]))
+    assert_equal '1', Liquid::Template.parse('{{ context.scopes }}').render!('context' => ContextDrop.new)
+    assert_equal '2', Liquid::Template.parse('{%for i in dummy%}{{ context.scopes }}{%endfor%}').render!('context' => ContextDrop.new, 'dummy' => [1])
+    assert_equal '3', Liquid::Template.parse('{%for i in dummy%}{%for i in dummy%}{{ context.scopes }}{%endfor%}{%endfor%}').render!('context' => ContextDrop.new, 'dummy' => [1])
   end
 
   def test_scope_though_proc
-    assert_equal('1', Liquid::Template.parse('{{ s }}').render!('context' => ContextDrop.new, 's' => proc { |c| c['context.scopes'] }))
-    assert_equal('2', Liquid::Template.parse('{%for i in dummy%}{{ s }}{%endfor%}').render!('context' => ContextDrop.new, 's' => proc { |c| c['context.scopes'] }, 'dummy' => [1]))
-    assert_equal('3', Liquid::Template.parse('{%for i in dummy%}{%for i in dummy%}{{ s }}{%endfor%}{%endfor%}').render!('context' => ContextDrop.new, 's' => proc { |c| c['context.scopes'] }, 'dummy' => [1]))
+    assert_equal '1', Liquid::Template.parse('{{ s }}').render!('context' => ContextDrop.new, 's' => proc { |c| c['context.scopes'] })
+    assert_equal '2', Liquid::Template.parse('{%for i in dummy%}{{ s }}{%endfor%}').render!('context' => ContextDrop.new, 's' => proc { |c| c['context.scopes'] }, 'dummy' => [1])
+    assert_equal '3', Liquid::Template.parse('{%for i in dummy%}{%for i in dummy%}{{ s }}{%endfor%}{%endfor%}').render!('context' => ContextDrop.new, 's' => proc { |c| c['context.scopes'] }, 'dummy' => [1])
   end
 
   def test_scope_with_assigns
-    assert_equal('variable', Liquid::Template.parse('{% assign a = "variable"%}{{a}}').render!('context' => ContextDrop.new))
-    assert_equal('variable', Liquid::Template.parse('{% assign a = "variable"%}{%for i in dummy%}{{a}}{%endfor%}').render!('context' => ContextDrop.new, 'dummy' => [1]))
-    assert_equal('test', Liquid::Template.parse('{% assign header_gif = "test"%}{{header_gif}}').render!('context' => ContextDrop.new))
-    assert_equal('test', Liquid::Template.parse("{% assign header_gif = 'test'%}{{header_gif}}").render!('context' => ContextDrop.new))
+    assert_equal 'variable', Liquid::Template.parse('{% assign a = "variable"%}{{a}}').render!('context' => ContextDrop.new)
+    assert_equal 'variable', Liquid::Template.parse('{% assign a = "variable"%}{%for i in dummy%}{{a}}{%endfor%}').render!('context' => ContextDrop.new, 'dummy' => [1])
+    assert_equal 'test', Liquid::Template.parse('{% assign header_gif = "test"%}{{header_gif}}').render!('context' => ContextDrop.new)
+    assert_equal 'test', Liquid::Template.parse("{% assign header_gif = 'test'%}{{header_gif}}").render!('context' => ContextDrop.new)
   end
 
   def test_scope_from_tags
-    assert_equal('1', Liquid::Template.parse('{% for i in context.scopes_as_array %}{{i}}{% endfor %}').render!('context' => ContextDrop.new, 'dummy' => [1]))
-    assert_equal('12', Liquid::Template.parse('{%for a in dummy%}{% for i in context.scopes_as_array %}{{i}}{% endfor %}{% endfor %}').render!('context' => ContextDrop.new, 'dummy' => [1]))
-    assert_equal('123', Liquid::Template.parse('{%for a in dummy%}{%for a in dummy%}{% for i in context.scopes_as_array %}{{i}}{% endfor %}{% endfor %}{% endfor %}').render!('context' => ContextDrop.new, 'dummy' => [1]))
+    assert_equal '1', Liquid::Template.parse('{% for i in context.scopes_as_array %}{{i}}{% endfor %}').render!('context' => ContextDrop.new, 'dummy' => [1])
+    assert_equal '12', Liquid::Template.parse('{%for a in dummy%}{% for i in context.scopes_as_array %}{{i}}{% endfor %}{% endfor %}').render!('context' => ContextDrop.new, 'dummy' => [1])
+    assert_equal '123', Liquid::Template.parse('{%for a in dummy%}{%for a in dummy%}{% for i in context.scopes_as_array %}{{i}}{% endfor %}{% endfor %}{% endfor %}').render!('context' => ContextDrop.new, 'dummy' => [1])
   end
 
   def test_access_context_from_drop
-    assert_equal('123', Liquid::Template.parse('{%for a in dummy%}{{ context.loop_pos }}{% endfor %}').render!('context' => ContextDrop.new, 'dummy' => [1, 2, 3]))
+    assert_equal '123', Liquid::Template.parse('{%for a in dummy%}{{ context.loop_pos }}{% endfor %}').render!('context' => ContextDrop.new, 'dummy' => [1, 2, 3])
   end
 
   def test_enumerable_drop
-    assert_equal('123', Liquid::Template.parse('{% for c in collection %}{{c}}{% endfor %}').render!('collection' => EnumerableDrop.new))
+    assert_equal '123', Liquid::Template.parse('{% for c in collection %}{{c}}{% endfor %}').render!('collection' => EnumerableDrop.new)
   end
 
   def test_enumerable_drop_size
-    assert_equal('3', Liquid::Template.parse('{{collection.size}}').render!('collection' => EnumerableDrop.new))
+    assert_equal '3', Liquid::Template.parse('{{collection.size}}').render!('collection' => EnumerableDrop.new)
   end
 
   def test_enumerable_drop_will_invoke_liquid_method_missing_for_clashing_method_names
@@ -225,7 +248,7 @@ class DropsTest < Minitest::Test
       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))
+    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)
@@ -236,22 +259,15 @@ class DropsTest < Minitest::Test
   end
 
   def test_empty_string_value_access
-    assert_equal('', Liquid::Template.parse('{{ product[value] }}').render!('product' => ProductDrop.new, 'value' => ''))
+    assert_equal '', Liquid::Template.parse('{{ product[value] }}').render!('product' => ProductDrop.new, 'value' => '')
   end
 
   def test_nil_value_access
-    assert_equal('', Liquid::Template.parse('{{ product[value] }}').render!('product' => ProductDrop.new, 'value' => nil))
+    assert_equal '', Liquid::Template.parse('{{ product[value] }}').render!('product' => ProductDrop.new, 'value' => nil)
   end
 
   def test_default_to_s_on_drops
-    assert_equal('ProductDrop', Liquid::Template.parse("{{ product }}").render!('product' => ProductDrop.new))
-    assert_equal('EnumerableDrop', Liquid::Template.parse('{{ collection }}').render!('collection' => EnumerableDrop.new))
-  end
-
-  def test_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)
+    assert_equal 'ProductDrop', Liquid::Template.parse("{{ product }}").render!('product' => ProductDrop.new)
+    assert_equal 'EnumerableDrop', Liquid::Template.parse('{{ collection }}').render!('collection' => EnumerableDrop.new)
   end
 end # DropsTest

test/integration/error_handling_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class ErrorHandlingTest < Minitest::Test
@@ -35,31 +33,31 @@ class ErrorHandlingTest < Minitest::Test
     TEXT
 
     output = Liquid::Template.parse(template, line_numbers: true).render('errors' => ErrorDrop.new)
-    assert_equal(expected, output)
+    assert_equal expected, output
   end
 
   def test_standard_error
     template = Liquid::Template.parse(' {{ errors.standard_error }} ')
-    assert_equal(' Liquid error: standard error ', template.render('errors' => ErrorDrop.new))
+    assert_equal ' Liquid error: standard error ', template.render('errors' => ErrorDrop.new)
 
-    assert_equal(1, template.errors.size)
-    assert_equal(StandardError, template.errors.first.class)
+    assert_equal 1, template.errors.size
+    assert_equal StandardError, template.errors.first.class
   end
 
   def test_syntax
     template = Liquid::Template.parse(' {{ errors.syntax_error }} ')
-    assert_equal(' Liquid syntax error: syntax error ', template.render('errors' => ErrorDrop.new))
+    assert_equal ' Liquid syntax error: syntax error ', template.render('errors' => ErrorDrop.new)
 
-    assert_equal(1, template.errors.size)
-    assert_equal(SyntaxError, template.errors.first.class)
+    assert_equal 1, template.errors.size
+    assert_equal SyntaxError, template.errors.first.class
   end
 
   def test_argument
     template = Liquid::Template.parse(' {{ errors.argument_error }} ')
-    assert_equal(' Liquid error: argument error ', template.render('errors' => ErrorDrop.new))
+    assert_equal ' Liquid error: argument error ', template.render('errors' => ErrorDrop.new)
 
-    assert_equal(1, template.errors.size)
-    assert_equal(ArgumentError, template.errors.first.class)
+    assert_equal 1, template.errors.size
+    assert_equal ArgumentError, template.errors.first.class
   end
 
   def test_missing_endtag_parse_time_error
@@ -78,9 +76,9 @@ class ErrorHandlingTest < Minitest::Test
 
   def test_lax_unrecognized_operator
     template = Liquid::Template.parse(' {% if 1 =! 2 %}ok{% endif %} ', error_mode: :lax)
-    assert_equal(' Liquid error: Unknown operator =! ', template.render)
-    assert_equal(1, template.errors.size)
-    assert_equal(Liquid::ArgumentError, template.errors.first.class)
+    assert_equal ' Liquid error: Unknown operator =! ', template.render
+    assert_equal 1, template.errors.size
+    assert_equal Liquid::ArgumentError, template.errors.first.class
   end
 
   def test_with_line_numbers_adds_numbers_to_parser_errors
@@ -124,8 +122,8 @@ class ErrorHandlingTest < Minitest::Test
       error_mode: :warn,
       line_numbers: true)
 
-    assert_equal(['Liquid syntax error (line 4): Unexpected character = in "1 =! 2"'],
-      template.warnings.map(&:message))
+    assert_equal ['Liquid syntax error (line 4): Unexpected character = in "1 =! 2"'],
+      template.warnings.map(&:message)
   end
 
   def test_parsing_strict_with_line_numbers_adds_numbers_to_lexer_errors
@@ -141,7 +139,7 @@ class ErrorHandlingTest < Minitest::Test
         line_numbers: true)
     end
 
-    assert_equal('Liquid syntax error (line 4): Unexpected character = in "1 =! 2"', err.message)
+    assert_equal 'Liquid syntax error (line 4): Unexpected character = in "1 =! 2"', err.message
   end
 
   def test_syntax_errors_in_nested_blocks_have_correct_line_number
@@ -158,37 +156,37 @@ class ErrorHandlingTest < Minitest::Test
         line_numbers: true)
     end
 
-    assert_equal("Liquid syntax error (line 5): Unknown tag 'foo'", err.message)
+    assert_equal "Liquid syntax error (line 5): Unknown tag 'foo'", err.message
   end
 
   def test_strict_error_messages
     err = assert_raises(SyntaxError) do
       Liquid::Template.parse(' {% if 1 =! 2 %}ok{% endif %} ', error_mode: :strict)
     end
-    assert_equal('Liquid syntax error: Unexpected character = in "1 =! 2"', err.message)
+    assert_equal 'Liquid syntax error: Unexpected character = in "1 =! 2"', err.message
 
     err = assert_raises(SyntaxError) do
       Liquid::Template.parse('{{%%%}}', error_mode: :strict)
     end
-    assert_equal('Liquid syntax error: Unexpected character % in "{{%%%}}"', err.message)
+    assert_equal 'Liquid syntax error: Unexpected character % in "{{%%%}}"', err.message
   end
 
   def test_warnings
     template = Liquid::Template.parse('{% if ~~~ %}{{%%%}}{% else %}{{ hello. }}{% endif %}', error_mode: :warn)
-    assert_equal(3, template.warnings.size)
-    assert_equal('Unexpected character ~ in "~~~"', template.warnings[0].to_s(false))
-    assert_equal('Unexpected character % in "{{%%%}}"', template.warnings[1].to_s(false))
-    assert_equal('Expected id but found end_of_string in "{{ hello. }}"', template.warnings[2].to_s(false))
-    assert_equal('', template.render)
+    assert_equal 3, template.warnings.size
+    assert_equal 'Unexpected character ~ in "~~~"', template.warnings[0].to_s(false)
+    assert_equal 'Unexpected character % in "{{%%%}}"', template.warnings[1].to_s(false)
+    assert_equal 'Expected id but found end_of_string in "{{ hello. }}"', template.warnings[2].to_s(false)
+    assert_equal '', template.render
   end
 
   def test_warning_line_numbers
     template = Liquid::Template.parse("{% if ~~~ %}\n{{%%%}}{% else %}\n{{ hello. }}{% endif %}", error_mode: :warn, line_numbers: true)
-    assert_equal('Liquid syntax error (line 1): Unexpected character ~ in "~~~"', template.warnings[0].message)
-    assert_equal('Liquid syntax error (line 2): Unexpected character % in "{{%%%}}"', template.warnings[1].message)
-    assert_equal('Liquid syntax error (line 3): Expected id but found end_of_string in "{{ hello. }}"', template.warnings[2].message)
-    assert_equal(3, template.warnings.size)
-    assert_equal([1, 2, 3], template.warnings.map(&:line_number))
+    assert_equal 'Liquid syntax error (line 1): Unexpected character ~ in "~~~"', template.warnings[0].message
+    assert_equal 'Liquid syntax error (line 2): Unexpected character % in "{{%%%}}"', template.warnings[1].message
+    assert_equal 'Liquid syntax error (line 3): Expected id but found end_of_string in "{{ hello. }}"', template.warnings[2].message
+    assert_equal 3, template.warnings.size
+    assert_equal [1, 2, 3], template.warnings.map(&:line_number)
   end
 
   # Liquid should not catch Exceptions that are not subclasses of StandardError, like Interrupt and NoMemoryError
@@ -204,41 +202,35 @@ class ErrorHandlingTest < Minitest::Test
 
     output = template.render('errors' => ErrorDrop.new)
 
-    assert_equal('This is a runtime error: Liquid error (line 1): internal', output)
-    assert_equal([Liquid::InternalError], template.errors.map(&:class))
+    assert_equal 'This is a runtime error: Liquid error (line 1): internal', output
+    assert_equal [Liquid::InternalError], template.errors.map(&:class)
   end
 
   def test_setting_default_exception_renderer
     old_exception_renderer = Liquid::Template.default_exception_renderer
     exceptions = []
-    Liquid::Template.default_exception_renderer = ->(e) {
-      exceptions << e
-      ''
-    }
+    Liquid::Template.default_exception_renderer = ->(e) { exceptions << e; '' }
     template = Liquid::Template.parse('This is a runtime error: {{ errors.argument_error }}')
 
     output = template.render('errors' => ErrorDrop.new)
 
-    assert_equal('This is a runtime error: ', output)
-    assert_equal([Liquid::ArgumentError], template.errors.map(&:class))
+    assert_equal 'This is a runtime error: ', output
+    assert_equal [Liquid::ArgumentError], template.errors.map(&:class)
   ensure
     Liquid::Template.default_exception_renderer = old_exception_renderer if old_exception_renderer
   end
 
   def test_exception_renderer_exposing_non_liquid_error
-    template   = Liquid::Template.parse('This is a runtime error: {{ errors.runtime_error }}', line_numbers: true)
+    template = Liquid::Template.parse('This is a runtime error: {{ errors.runtime_error }}', line_numbers: true)
     exceptions = []
-    handler    = ->(e) {
-      exceptions << e
-      e.cause
-    }
+    handler = ->(e) { exceptions << e; e.cause }
 
     output = template.render({ 'errors' => ErrorDrop.new }, exception_renderer: handler)
 
-    assert_equal('This is a runtime error: runtime error', output)
-    assert_equal([Liquid::InternalError], exceptions.map(&:class))
-    assert_equal(exceptions, template.errors)
-    assert_equal('#<RuntimeError: runtime error>', exceptions.first.cause.inspect)
+    assert_equal 'This is a runtime error: runtime error', output
+    assert_equal [Liquid::InternalError], exceptions.map(&:class)
+    assert_equal exceptions, template.errors
+    assert_equal '#<RuntimeError: runtime error>', exceptions.first.cause.inspect
   end
 
   class TestFileSystem
@@ -252,13 +244,12 @@ class ErrorHandlingTest < Minitest::Test
 
     begin
       Liquid::Template.file_system = TestFileSystem.new
-
       template = Liquid::Template.parse("Argument error:\n{% include 'product' %}", line_numbers: true)
-      page     = template.render('errors' => ErrorDrop.new)
+      page = template.render('errors' => ErrorDrop.new)
     ensure
       Liquid::Template.file_system = old_file_system
     end
-    assert_equal("Argument error:\nLiquid error (product line 1): argument error", page)
-    assert_equal("product", template.errors.first.template_name)
+    assert_equal "Argument error:\nLiquid error (product line 1): argument error", page
+    assert_equal "product", template.errors.first.template_name
   end
 end

test/integration/filter_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 module MoneyFilter
@@ -41,13 +39,13 @@ class FiltersTest < Minitest::Test
     @context['var'] = 1000
     @context.add_filters(MoneyFilter)
 
-    assert_equal(' 1000$ ', Template.parse("{{var | money}}").render(@context))
+    assert_equal ' 1000$ ', Template.parse("{{var | money}}").render(@context)
   end
 
   def test_underscore_in_filter_name
     @context['var'] = 1000
     @context.add_filters(MoneyFilter)
-    assert_equal(' 1000$ ', Template.parse("{{var | money_with_underscore}}").render(@context))
+    assert_equal ' 1000$ ', Template.parse("{{var | money_with_underscore}}").render(@context)
   end
 
   def test_second_filter_overwrites_first
@@ -55,103 +53,103 @@ class FiltersTest < Minitest::Test
     @context.add_filters(MoneyFilter)
     @context.add_filters(CanadianMoneyFilter)
 
-    assert_equal(' 1000$ CAD ', Template.parse("{{var | money}}").render(@context))
+    assert_equal ' 1000$ CAD ', Template.parse("{{var | money}}").render(@context)
   end
 
   def test_size
     @context['var'] = 'abcd'
     @context.add_filters(MoneyFilter)
 
-    assert_equal('4', Template.parse("{{var | size}}").render(@context))
+    assert_equal '4', Template.parse("{{var | size}}").render(@context)
   end
 
   def test_join
     @context['var'] = [1, 2, 3, 4]
 
-    assert_equal("1 2 3 4", Template.parse("{{var | join}}").render(@context))
+    assert_equal "1 2 3 4", Template.parse("{{var | join}}").render(@context)
   end
 
   def test_sort
-    @context['value']   = 3
+    @context['value'] = 3
     @context['numbers'] = [2, 1, 4, 3]
-    @context['words']   = ['expected', 'as', 'alphabetic']
-    @context['arrays']  = ['flower', 'are']
+    @context['words'] = ['expected', 'as', 'alphabetic']
+    @context['arrays'] = ['flower', 'are']
     @context['case_sensitive'] = ['sensitive', 'Expected', 'case']
 
-    assert_equal('1 2 3 4', Template.parse("{{numbers | sort | join}}").render(@context))
-    assert_equal('alphabetic as expected', Template.parse("{{words | sort | join}}").render(@context))
-    assert_equal('3', Template.parse("{{value | sort}}").render(@context))
-    assert_equal('are flower', Template.parse("{{arrays | sort | join}}").render(@context))
-    assert_equal('Expected case sensitive', Template.parse("{{case_sensitive | sort | join}}").render(@context))
+    assert_equal '1 2 3 4', Template.parse("{{numbers | sort | join}}").render(@context)
+    assert_equal 'alphabetic as expected', Template.parse("{{words | sort | join}}").render(@context)
+    assert_equal '3', Template.parse("{{value | sort}}").render(@context)
+    assert_equal 'are flower', Template.parse("{{arrays | sort | join}}").render(@context)
+    assert_equal 'Expected case sensitive', Template.parse("{{case_sensitive | sort | join}}").render(@context)
   end
 
   def test_sort_natural
-    @context['words']   = ['case', 'Assert', 'Insensitive']
-    @context['hashes']  = [{ 'a' => 'A' }, { 'a' => 'b' }, { 'a' => 'C' }]
+    @context['words'] = ['case', 'Assert', 'Insensitive']
+    @context['hashes'] = [{ 'a' => 'A' }, { 'a' => 'b' }, { 'a' => 'C' }]
     @context['objects'] = [TestObject.new('A'), TestObject.new('b'), TestObject.new('C')]
 
     # Test strings
-    assert_equal('Assert case Insensitive', Template.parse("{{words | sort_natural | join}}").render(@context))
+    assert_equal 'Assert case Insensitive', Template.parse("{{words | sort_natural | join}}").render(@context)
 
     # Test hashes
-    assert_equal('A b C', Template.parse("{{hashes | sort_natural: 'a' | map: 'a' | join}}").render(@context))
+    assert_equal 'A b C', Template.parse("{{hashes | sort_natural: 'a' | map: 'a' | join}}").render(@context)
 
     # Test objects
-    assert_equal('A b C', Template.parse("{{objects | sort_natural: 'a' | map: 'a' | join}}").render(@context))
+    assert_equal 'A b C', Template.parse("{{objects | sort_natural: 'a' | map: 'a' | join}}").render(@context)
   end
 
   def test_compact
-    @context['words']   = ['a', nil, 'b', nil, 'c']
-    @context['hashes']  = [{ 'a' => 'A' }, { 'a' => nil }, { 'a' => 'C' }]
+    @context['words'] = ['a', nil, 'b', nil, 'c']
+    @context['hashes'] = [{ 'a' => 'A' }, { 'a' => nil }, { 'a' => 'C' }]
     @context['objects'] = [TestObject.new('A'), TestObject.new(nil), TestObject.new('C')]
 
     # Test strings
-    assert_equal('a b c', Template.parse("{{words | compact | join}}").render(@context))
+    assert_equal 'a b c', Template.parse("{{words | compact | join}}").render(@context)
 
     # Test hashes
-    assert_equal('A C', Template.parse("{{hashes | compact: 'a' | map: 'a' | join}}").render(@context))
+    assert_equal 'A C', Template.parse("{{hashes | compact: 'a' | map: 'a' | join}}").render(@context)
 
     # Test objects
-    assert_equal('A C', Template.parse("{{objects | compact: 'a' | map: 'a' | join}}").render(@context))
+    assert_equal 'A C', Template.parse("{{objects | compact: 'a' | map: 'a' | join}}").render(@context)
   end
 
   def test_strip_html
     @context['var'] = "<b>bla blub</a>"
 
-    assert_equal("bla blub", Template.parse("{{ var | strip_html }}").render(@context))
+    assert_equal "bla blub", Template.parse("{{ var | strip_html }}").render(@context)
   end
 
   def test_strip_html_ignore_comments_with_html
     @context['var'] = "<!-- split and some <ul> tag --><b>bla blub</a>"
 
-    assert_equal("bla blub", Template.parse("{{ var | strip_html }}").render(@context))
+    assert_equal "bla blub", Template.parse("{{ var | strip_html }}").render(@context)
   end
 
   def test_capitalize
     @context['var'] = "blub"
 
-    assert_equal("Blub", Template.parse("{{ var | capitalize }}").render(@context))
+    assert_equal "Blub", Template.parse("{{ var | capitalize }}").render(@context)
   end
 
   def test_nonexistent_filter_is_ignored
     @context['var'] = 1000
 
-    assert_equal('1000', Template.parse("{{ var | xyzzy }}").render(@context))
+    assert_equal '1000', Template.parse("{{ var | xyzzy }}").render(@context)
   end
 
   def test_filter_with_keyword_arguments
     @context['surname'] = 'john'
-    @context['input']   = 'hello %{first_name}, %{last_name}'
+    @context['input'] = 'hello %{first_name}, %{last_name}'
     @context.add_filters(SubstituteFilter)
-    output              = Template.parse(%({{ input | substitute: first_name: surname, last_name: 'doe' }})).render(@context)
-    assert_equal('hello john, doe', output)
+    output = Template.parse(%({{ input | substitute: first_name: surname, last_name: 'doe' }})).render(@context)
+    assert_equal 'hello john, doe', output
   end
 
   def test_override_object_method_in_filter
-    assert_equal("tap overridden", Template.parse("{{var | tap}}").render!({ 'var' => 1000 }, filters: [OverrideObjectMethodFilter]))
+    assert_equal "tap overridden", Template.parse("{{var | tap}}").render!({ 'var' => 1000 }, filters: [OverrideObjectMethodFilter])
 
     # tap still treated as a non-existent filter
-    assert_equal("1000", Template.parse("{{var | tap}}").render!('var' => 1000))
+    assert_equal "1000", Template.parse("{{var | tap}}").render!('var' => 1000)
   end
 end
 
@@ -167,8 +165,8 @@ class FiltersInTemplate < Minitest::Test
   end
 
   def test_local_filter_with_deprecated_syntax
-    assert_equal(" 1000$ CAD ", Template.parse("{{1000 | money}}").render!(nil, CanadianMoneyFilter))
-    assert_equal(" 1000$ CAD ", Template.parse("{{1000 | money}}").render!(nil, [CanadianMoneyFilter]))
+    assert_equal " 1000$ CAD ", Template.parse("{{1000 | money}}").render!(nil, CanadianMoneyFilter)
+    assert_equal " 1000$ CAD ", Template.parse("{{1000 | money}}").render!(nil, [CanadianMoneyFilter])
   end
 end # FiltersTest
 

test/integration/hash_ordering_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class HashOrderingTest < Minitest::Test

test/integration/output_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 module FunnyFilter
@@ -42,84 +40,84 @@ class OutputTest < Minitest::Test
     text = %( {{best_cars}} )
 
     expected = %( bmw )
-    assert_equal(expected, Template.parse(text).render!(@assigns))
+    assert_equal expected, Template.parse(text).render!(@assigns)
   end
 
   def test_variable_traversing_with_two_brackets
     text = %({{ site.data.menu[include.menu][include.locale] }})
-    assert_equal("it works!", Template.parse(text).render!(
+    assert_equal "it works!", Template.parse(text).render!(
       "site" => { "data" => { "menu" => { "foo" => { "bar" => "it works!" } } } },
       "include" => { "menu" => "foo", "locale" => "bar" }
-    ))
+    )
   end
 
   def test_variable_traversing
     text = %( {{car.bmw}} {{car.gm}} {{car.bmw}} )
 
     expected = %( good bad good )
-    assert_equal(expected, Template.parse(text).render!(@assigns))
+    assert_equal expected, Template.parse(text).render!(@assigns)
   end
 
   def test_variable_piping
-    text     = %( {{ car.gm | make_funny }} )
+    text = %( {{ car.gm | make_funny }} )
     expected = %( LOL )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 
   def test_variable_piping_with_input
-    text     = %( {{ car.gm | cite_funny }} )
+    text = %( {{ car.gm | cite_funny }} )
     expected = %( LOL: bad )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 
   def test_variable_piping_with_args
-    text     = %! {{ car.gm | add_smiley : ':-(' }} !
+    text = %! {{ car.gm | add_smiley : ':-(' }} !
     expected = %| bad :-( |
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 
   def test_variable_piping_with_no_args
-    text     = %( {{ car.gm | add_smiley }} )
+    text = %( {{ car.gm | add_smiley }} )
     expected = %| bad :-) |
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 
   def test_multiple_variable_piping_with_args
-    text     = %! {{ car.gm | add_smiley : ':-(' | add_smiley : ':-('}} !
+    text = %! {{ car.gm | add_smiley : ':-(' | add_smiley : ':-('}} !
     expected = %| bad :-( :-( |
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 
   def test_variable_piping_with_multiple_args
-    text     = %( {{ car.gm | add_tag : 'span', 'bar'}} )
+    text = %( {{ car.gm | add_tag : 'span', 'bar'}} )
     expected = %( <span id="bar">bad</span> )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 
   def test_variable_piping_with_variable_args
-    text     = %( {{ car.gm | add_tag : 'span', car.bmw}} )
+    text = %( {{ car.gm | add_tag : 'span', car.bmw}} )
     expected = %( <span id="good">bad</span> )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 
   def test_multiple_pipings
-    text     = %( {{ best_cars | cite_funny | paragraph }} )
+    text = %( {{ best_cars | cite_funny | paragraph }} )
     expected = %( <p>LOL: bmw</p> )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 
   def test_link_to
-    text     = %( {{ 'Typo' | link_to: 'http://typo.leetsoft.com' }} )
+    text = %( {{ 'Typo' | link_to: 'http://typo.leetsoft.com' }} )
     expected = %( <a href="http://typo.leetsoft.com">Typo</a> )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter]))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: [FunnyFilter])
   end
 end # OutputTest

test/integration/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) { |node| node.name } # rubocop:disable Style/SymbolProc
+      .add_callback_for(VariableLookup, &:name)
   end
 
   def visit(template)

test/integration/parsing_quirks_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class ParsingQuirksTest < Minitest::Test
@@ -7,7 +5,7 @@ class ParsingQuirksTest < Minitest::Test
 
   def test_parsing_css
     text = " div { font-weight: bold; } "
-    assert_equal(text, Template.parse(text).render!)
+    assert_equal text, Template.parse(text).render!
   end
 
   def test_raise_on_single_close_bracet
@@ -29,7 +27,7 @@ class ParsingQuirksTest < Minitest::Test
   end
 
   def test_error_on_empty_filter
-    assert(Template.parse("{{test}}"))
+    assert Template.parse("{{test}}")
 
     with_error_mode(:lax) do
       assert Template.parse("{{|test}}")
@@ -64,15 +62,15 @@ class ParsingQuirksTest < Minitest::Test
   end
 
   def test_no_error_on_lax_empty_filter
-    assert(Template.parse("{{test |a|b|}}", error_mode: :lax))
-    assert(Template.parse("{{test}}", error_mode: :lax))
-    assert(Template.parse("{{|test|}}", error_mode: :lax))
+    assert Template.parse("{{test |a|b|}}", error_mode: :lax)
+    assert Template.parse("{{test}}", error_mode: :lax)
+    assert Template.parse("{{|test|}}", error_mode: :lax)
   end
 
   def test_meaningless_parens_lax
     with_error_mode(:lax) do
       assigns = { 'b' => 'bar', 'c' => 'baz' }
-      markup  = "a == 'foo' or (b == 'bar' and c == 'baz') or false"
+      markup = "a == 'foo' or (b == 'bar' and c == 'baz') or false"
       assert_template_result(' YES ', "{% if #{markup} %} YES {% endif %}", assigns)
     end
   end

test/integration/render_profiling_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 class RenderProfilingTest < Minitest::Test
@@ -19,35 +17,35 @@ class RenderProfilingTest < Minitest::Test
     t = Template.parse("{{ 'a string' | upcase }}")
     t.render!
 
-    assert_nil(t.profiler)
+    assert_nil t.profiler
   end
 
   def test_parse_makes_available_simple_profiling
     t = Template.parse("{{ 'a string' | upcase }}", profile: true)
     t.render!
 
-    assert_equal(1, t.profiler.length)
+    assert_equal 1, t.profiler.length
 
     node = t.profiler[0]
-    assert_equal(" 'a string' | upcase ", node.code)
+    assert_equal " 'a string' | upcase ", node.code
   end
 
   def test_render_ignores_raw_strings_when_profiling
     t = Template.parse("This is raw string\nstuff\nNewline", profile: true)
     t.render!
 
-    assert_equal(0, t.profiler.length)
+    assert_equal 0, t.profiler.length
   end
 
   def test_profiling_includes_line_numbers_of_liquid_nodes
     t = Template.parse("{{ 'a string' | upcase }}\n{% increment test %}", profile: true)
     t.render!
-    assert_equal(2, t.profiler.length)
+    assert_equal 2, t.profiler.length
 
     # {{ 'a string' | upcase }}
-    assert_equal(1, t.profiler[0].line_number)
+    assert_equal 1, t.profiler[0].line_number
     # {{ increment test }}
-    assert_equal(2, t.profiler[1].line_number)
+    assert_equal 2, t.profiler[1].line_number
   end
 
   def test_profiling_includes_line_numbers_of_included_partials
@@ -57,9 +55,9 @@ class RenderProfilingTest < Minitest::Test
     included_children = t.profiler[0].children
 
     # {% assign template_name = 'a_template' %}
-    assert_equal(1, included_children[0].line_number)
+    assert_equal 1, included_children[0].line_number
     # {{ template_name }}
-    assert_equal(2, included_children[1].line_number)
+    assert_equal 2, included_children[1].line_number
   end
 
   def test_profiling_times_the_rendering_of_tokens
@@ -67,14 +65,14 @@ class RenderProfilingTest < Minitest::Test
     t.render!
 
     node = t.profiler[0]
-    refute_nil(node.render_time)
+    refute_nil node.render_time
   end
 
   def test_profiling_times_the_entire_render
     t = Template.parse("{% include 'a_template' %}", profile: true)
     t.render!
 
-    assert(t.profiler.total_render_time >= 0, "Total render time was not calculated")
+    assert t.profiler.total_render_time >= 0, "Total render time was not calculated"
   end
 
   def test_profiling_uses_include_to_mark_children
@@ -82,7 +80,7 @@ class RenderProfilingTest < Minitest::Test
     t.render!
 
     include_node = t.profiler[1]
-    assert_equal(2, include_node.children.length)
+    assert_equal 2, include_node.children.length
   end
 
   def test_profiling_marks_children_with_the_name_of_included_partial
@@ -134,38 +132,23 @@ class RenderProfilingTest < Minitest::Test
       timing_count += 1
     end
 
-    assert_equal(2, timing_count)
+    assert_equal 2, timing_count
   end
 
   def test_profiling_marks_children_of_if_blocks
     t = Template.parse("{% if true %} {% increment test %} {{ test }} {% endif %}", profile: true)
     t.render!
 
-    assert_equal(1, t.profiler.length)
-    assert_equal(2, t.profiler[0].children.length)
+    assert_equal 1, t.profiler.length
+    assert_equal 2, t.profiler[0].children.length
   end
 
   def test_profiling_marks_children_of_for_blocks
     t = Template.parse("{% for item in collection %} {{ item }} {% endfor %}", profile: true)
     t.render!("collection" => ["one", "two"])
 
-    assert_equal(1, t.profiler.length)
+    assert_equal 1, t.profiler.length
     # Will profile each invocation of the for block
-    assert_equal(2, t.profiler[0].children.length)
-  end
-
-  def test_profiling_supports_self_time
-    t = Template.parse("{% for item in collection %} {{ item }} {% endfor %}", profile: true)
-    t.render!("collection" => ["one", "two"])
-    leaf = t.profiler[0].children[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_equal 2, t.profiler[0].children.length
   end
 end

test/integration/security_test.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 require 'test_helper'
 
 module SecurityFilter
@@ -16,72 +14,65 @@ class SecurityTest < Minitest::Test
   end
 
   def test_no_instance_eval
-    text     = %( {{ '1+1' | instance_eval }} )
+    text = %( {{ '1+1' | instance_eval }} )
     expected = %( 1+1 )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns))
+    assert_equal expected, Template.parse(text).render!(@assigns)
   end
 
   def test_no_existing_instance_eval
-    text     = %( {{ '1+1' | __instance_eval__ }} )
+    text = %( {{ '1+1' | __instance_eval__ }} )
     expected = %( 1+1 )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns))
+    assert_equal expected, Template.parse(text).render!(@assigns)
   end
 
   def test_no_instance_eval_after_mixing_in_new_filter
-    text     = %( {{ '1+1' | instance_eval }} )
+    text = %( {{ '1+1' | instance_eval }} )
     expected = %( 1+1 )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns))
+    assert_equal expected, Template.parse(text).render!(@assigns)
   end
 
   def test_no_instance_eval_later_in_chain
-    text     = %( {{ '1+1' | add_one | instance_eval }} )
+    text = %( {{ '1+1' | add_one | instance_eval }} )
     expected = %( 1+1 + 1 )
 
-    assert_equal(expected, Template.parse(text).render!(@assigns, filters: SecurityFilter))
+    assert_equal expected, Template.parse(text).render!(@assigns, filters: SecurityFilter)
   end
 
-  def test_does_not_permanently_add_filters_to_symbol_table
+  def test_does_not_add_filters_to_symbol_table
     current_symbols = Symbol.all_symbols
 
-    # 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
+    test = %( {{ "some_string" | a_bad_filter }} )
 
-    GC.start
+    template = Template.parse(test)
+    assert_equal [], (Symbol.all_symbols - current_symbols)
 
-    assert_equal([], (Symbol.all_symbols - current_symbols))
+    template.render!
+    assert_equal [], (Symbol.all_symbols - current_symbols)
   end
 
   def test_does_not_add_drop_methods_to_symbol_table
     current_symbols = Symbol.all_symbols
 
     assigns = { 'drop' => Drop.new }
-    assert_equal("", Template.parse("{{ drop.custom_method_1 }}", assigns).render!)
-    assert_equal("", Template.parse("{{ drop.custom_method_2 }}", assigns).render!)
-    assert_equal("", Template.parse("{{ drop.custom_method_3 }}", assigns).render!)
+    assert_equal "", Template.parse("{{ drop.custom_method_1 }}", assigns).render!
+    assert_equal "", Template.parse("{{ drop.custom_method_2 }}", assigns).render!
+    assert_equal "", Template.parse("{{ drop.custom_method_3 }}", assigns).render!
 
-    assert_equal([], (Symbol.all_symbols - current_symbols))
+    assert_equal [], (Symbol.all_symbols - current_symbols)
   end
 
   def test_max_depth_nested_blocks_does_not_raise_exception
     depth = Liquid::Block::MAX_DEPTH
-    code  = "{% if true %}" * depth + "rendered" + "{% endif %}" * depth
-    assert_equal("rendered", Template.parse(code).render!)
+    code = "{% if true %}" * depth + "rendered" + "{% endif %}" * depth
+    assert_equal "rendered", Template.parse(code).render!
   end
 
   def test_more_than_max_depth_nested_blocks_raises_exception
     depth = Liquid::Block::MAX_DEPTH + 1
-    code  = "{% if true %}" * depth + "rendered" + "{% endif %}" * depth
+    code = "{% if true %}" * depth + "rendered" + "{% endif %}" * depth
     assert_raises(Liquid::StackLevelError) do
       Template.parse(code).render!
     end