make Template override static registers only when the register key is not defined

Merge pull request #1257 from Shopify/StaticRegisters/remove-registers-attr-reader
[StaticRegisters] Remove registers attr_reader
2026-01-02 00:05:42 +03:00 · 2020-05-28 09:08:03 -04:00 · 2020-05-22 14:01:37 -04:00 · 2020-05-22 13:42:44 -04:00 · 2020-05-22 12:15:52 -04:00 · 2020-05-22 10:51:07 -04:00
142 changed files with 3240 additions and 2550 deletions
--- a/.rubocop-https---shopify-github-io-ruby-style-guide-rubocop-yml
+++ b/.rubocop-https---shopify-github-io-ruby-style-guide-rubocop-yml
@@ -1,3 +1,5 @@
+# Recommended rubocop version: ~> 0.78.0
+
 AllCops:
  Exclude:
  - 'db/schema.rb'
@@ -20,7 +22,7 @@ Style/Alias:
  - prefer_alias
  - prefer_alias_method

-Layout/AlignHash:
+Layout/HashAlignment:
  EnforcedHashRocketStyle: key
  EnforcedColonStyle: key
  EnforcedLastArgumentHashStyle: ignore_implicit
@@ -30,7 +32,7 @@ Layout/AlignHash:
  - ignore_implicit
  - ignore_explicit

-Layout/AlignParameters:
+Layout/ParameterAlignment:
  EnforcedStyle: with_fixed_indentation
  SupportedStyles:
  - with_first_parameter
@@ -172,7 +174,7 @@ Naming/FileName:
  Regex:
  IgnoreExecutableScripts: true

-Layout/IndentFirstArgument:
+Layout/FirstArgumentIndentation:
  EnforcedStyle: consistent
  SupportedStyles:
  - consistent
@@ -225,7 +227,7 @@ Layout/IndentationConsistency:
 Layout/IndentationWidth:
  Width: 2

-Layout/IndentFirstArrayElement:
+Layout/FirstArrayElementIndentation:
  EnforcedStyle: consistent
  SupportedStyles:
  - special_inside_parentheses
@@ -233,10 +235,10 @@ Layout/IndentFirstArrayElement:
  - align_brackets
  IndentationWidth:

-Layout/IndentAssignment:
+Layout/AssignmentIndentation:
  IndentationWidth:

-Layout/IndentFirstHashElement:
+Layout/FirstHashElementIndentation:
  EnforcedStyle: consistent
  SupportedStyles:
  - special_inside_parentheses
@@ -340,9 +342,9 @@ Style/PercentQLiterals:
 Naming/PredicateName:
  NamePrefix:
  - is_
-  NamePrefixBlacklist:
+  ForbiddenPrefixes:
  - is_
-  NameWhitelist:
+  AllowedMethods:
  - is_a?
  Exclude:
  - 'spec/**/*'
@@ -467,7 +469,7 @@ Style/TernaryParentheses:
  - require_no_parentheses
  AllowSafeAssignment: true

-Layout/TrailingBlankLines:
+Layout/TrailingEmptyLines:
  EnforcedStyle: final_newline
  SupportedStyles:
  - final_newline
@@ -478,7 +480,7 @@ Style/TrivialAccessors:
  AllowPredicates: true
  AllowDSLWriters: false
  IgnoreClassMethods: false
-  Whitelist:
+  AllowedMethods:
  - to_ary
  - to_a
  - to_c
@@ -509,7 +511,7 @@ Style/WhileUntilModifier:
 Metrics/BlockNesting:
  Max: 3

-Metrics/LineLength:
+Layout/LineLength:
  Max: 120
  AllowHeredoc: true
  AllowURI: true
@@ -561,7 +563,7 @@ Lint/UnusedMethodArgument:
 Naming/AccessorMethodName:
  Enabled: true

-Layout/AlignArray:
+Layout/ArrayAlignment:
  Enabled: true

 Style/ArrayJoin:
@@ -819,13 +821,13 @@ Layout/TrailingWhitespace:
 Style/UnlessElse:
  Enabled: true

-Style/UnneededCapitalW:
+Style/RedundantCapitalW:
  Enabled: true

-Style/UnneededInterpolation:
+Style/RedundantInterpolation:
  Enabled: true

-Style/UnneededPercentQ:
+Style/RedundantPercentQ:
  Enabled: true

 Style/VariableInterpolation:
@@ -840,7 +842,7 @@ Style/WhileUntilDo:
 Style/ZeroLengthPredicate:
  Enabled: true

-Layout/IndentHeredoc:
+Layout/HeredocIndentation:
  EnforcedStyle: squiggly

 Lint/AmbiguousOperator:
@@ -864,7 +866,7 @@ Lint/DeprecatedClassMethods:
 Lint/DuplicateMethods:
  Enabled: true

-Lint/DuplicatedKey:
+Lint/DuplicateHashKey:
  Enabled: true

 Lint/EachWithObjectArgument:
@@ -891,8 +893,8 @@ Lint/FloatOutOfRange:
 Lint/FormatParameterMismatch:
  Enabled: true

-Lint/HandleExceptions:
-  Enabled: true
+Lint/SuppressedException:
+  AllowComments: true

 Lint/ImplicitStringConcatenation:
  Description: Checks for adjacent string literals on the same line, which could
@@ -947,7 +949,7 @@ Lint/ShadowedException:
 Lint/ShadowingOuterLocalVariable:
  Enabled: true

-Lint/StringConversionInInterpolation:
+Lint/RedundantStringCoercion:
  Enabled: true

 Lint/UnderscorePrefixedVariableName:
@@ -956,13 +958,13 @@ Lint/UnderscorePrefixedVariableName:
 Lint/UnifiedInteger:
  Enabled: true

-Lint/UnneededCopDisableDirective:
+Lint/RedundantCopDisableDirective:
  Enabled: true

-Lint/UnneededCopEnableDirective:
+Lint/RedundantCopEnableDirective:
  Enabled: true

-Lint/UnneededSplatExpansion:
+Lint/RedundantSplatExpansion:
  Enabled: true

 Lint/UnreachableCode:
--- a/.rubocop.yml
+++ b/.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
@@ -8,9 +8,10 @@ Performance:
  Enabled: true

 AllCops:
+  TargetRubyVersion: 2.4
  Exclude:
    - 'vendor/bundle/**/*'
-      
+
 Naming/MethodName:
  Exclude:
-    - 'example/server/liquid_servlet.rb'
+    - 'example/server/liquid_servlet.rb'
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,107 +1,11 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2019-08-29 12:16:25 +1000 using RuboCop version 0.74.0.
+# on 2019-09-11 06:34:25 +1000 using RuboCop version 0.74.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.

-# Offense count: 13
-# Cop supports --auto-correct.
-# Configuration parameters: AllowMultipleStyles, EnforcedHashRocketStyle, EnforcedColonStyle, EnforcedLastArgumentHashStyle.
-# SupportedHashRocketStyles: key, separator, table
-# SupportedColonStyles: key, separator, table
-# SupportedLastArgumentHashStyles: always_inspect, always_ignore, ignore_implicit, ignore_explicit
-Layout/AlignHash:
-  Exclude:
-    - 'lib/liquid/condition.rb'
-    - 'lib/liquid/expression.rb'
-    - 'performance/shopify/comment_form.rb'
-    - 'performance/shopify/database.rb'
-    - 'performance/shopify/paginate.rb'
-    - 'test/unit/context_unit_test.rb'
-
-# Offense count: 3
-# Cop supports --auto-correct.
-# Configuration parameters: AllowForAlignment, AllowBeforeTrailingComments, ForceEqualSignAlignment.
-Layout/ExtraSpacing:
-  Exclude:
-    - 'performance/shopify/paginate.rb'
-
-# Offense count: 5
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: squiggly, active_support, powerpack, unindent
-Layout/IndentHeredoc:
-  Exclude:
-    - 'test/integration/tags/for_tag_test.rb'
-    - 'test/integration/trim_mode_test.rb'
-
-# Offense count: 6
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: symmetrical, new_line, same_line
-Layout/MultilineMethodCallBraceLayout:
-  Exclude:
-    - 'test/integration/error_handling_test.rb'
-    - 'test/unit/strainer_unit_test.rb'
-
-# Offense count: 4
-# Cop supports --auto-correct.
-# Configuration parameters: AllowForAlignment.
-Layout/SpaceAroundOperators:
-  Exclude:
-    - 'lib/liquid/condition.rb'
-    - 'performance/shopify/paginate.rb'
-
-# Offense count: 9
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
-# SupportedStyles: space, no_space
-# SupportedStylesForEmptyBraces: space, no_space
-Layout/SpaceBeforeBlockBraces:
-  Exclude:
-    - 'example/server/server.rb'
-    - 'lib/liquid/variable.rb'
-    - 'test/integration/drop_test.rb'
-    - 'test/integration/standard_filter_test.rb'
-    - 'test/integration/tags/if_else_tag_test.rb'
-
-# Offense count: 19
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBrackets.
-# SupportedStyles: space, no_space, compact
-# SupportedStylesForEmptyBrackets: space, no_space
-Layout/SpaceInsideArrayLiteralBrackets:
-  Exclude:
-    - 'test/integration/drop_test.rb'
-    - 'test/integration/standard_filter_test.rb'
-    - 'test/integration/tags/for_tag_test.rb'
-    - 'test/integration/tags/include_tag_test.rb'
-    - 'test/integration/tags/standard_tag_test.rb'
-    - 'test/unit/context_unit_test.rb'
-
-# Offense count: 2
-Lint/AmbiguousOperator:
-  Exclude:
-    - 'test/unit/condition_unit_test.rb'
-
-# Offense count: 16
-# 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/include.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.
@@ -110,52 +14,11 @@ Lint/InheritException:
  Exclude:
    - 'lib/liquid/interrupts.rb'

-# Offense count: 10
-# Cop supports --auto-correct.
-# Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.
-Lint/UnusedBlockArgument:
-  Exclude:
-    - 'lib/liquid/condition.rb'
-    - 'lib/liquid/context.rb'
-    - 'lib/liquid/document.rb'
-    - 'lib/liquid/parse_context.rb'
-    - 'lib/liquid/template.rb'
-    - 'performance/shopify/json_filter.rb'
-    - 'test/integration/filter_test.rb'
-    - 'test/integration/render_profiling_test.rb'
-    - 'test/integration/variable_test.rb'
-    - 'test/unit/condition_unit_test.rb'
-
-# Offense count: 12
-# Cop supports --auto-correct.
-# Configuration parameters: AllowUnusedKeywordArguments, IgnoreEmptyMethods.
-Lint/UnusedMethodArgument:
-  Exclude:
-    - 'example/server/liquid_servlet.rb'
-    - 'test/integration/blank_test.rb'
-    - 'test/integration/error_handling_test.rb'
-    - 'test/integration/filter_test.rb'
-    - 'test/integration/output_test.rb'
-    - 'test/integration/standard_filter_test.rb'
-    - 'test/integration/tags/include_tag_test.rb'
-    - 'test/unit/strainer_unit_test.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: 95
+# Offense count: 98
 # Cop supports --auto-correct.
 # Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
-Metrics/LineLength:
+Layout/LineLength:
  Max: 294

 # Offense count: 44
@@ -177,235 +40,9 @@ Naming/ConstantName:
    - 'performance/shopify/paginate.rb'
    - 'test/integration/tags/include_tag_test.rb'

-# Offense count: 2
-# Configuration parameters: .
-# SupportedStyles: snake_case, camelCase
-Naming/MethodName:
-  EnforcedStyle: snake_case
-
-# Offense count: 3
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: always, conditionals
-Style/AndOr:
-  Exclude:
-    - 'lib/liquid/i18n.rb'
-    - 'lib/liquid/tags/table_row.rb'
-    - 'lib/liquid/tokenizer.rb'
-
-# Offense count: 40
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: braces, no_braces, context_dependent
-Style/BracesAroundHashParameters:
-  Exclude:
-    - 'test/integration/error_handling_test.rb'
-    - 'test/integration/filter_test.rb'
-    - 'test/integration/render_profiling_test.rb'
-    - 'test/integration/standard_filter_test.rb'
-    - 'test/integration/tags/echo_test.rb'
-    - 'test/integration/tags/increment_tag_test.rb'
-    - 'test/integration/tags/standard_tag_test.rb'
-    - 'test/integration/template_test.rb'
-    - 'test/unit/condition_unit_test.rb'
-    - 'test/unit/context_unit_test.rb'
-
 # Offense count: 5
 Style/ClassVars:
  Exclude:
    - 'lib/liquid/condition.rb'
    - 'lib/liquid/strainer.rb'
-    - 'lib/liquid/template.rb'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, SingleLineConditionsOnly, IncludeTernaryExpressions.
-# SupportedStyles: assign_to_condition, assign_inside_condition
-Style/ConditionalAssignment:
-  Exclude:
-    - 'lib/liquid/errors.rb'
-    - 'performance/shopify/shop_filter.rb'
-
-# Offense count: 1
-# Configuration parameters: AllowCoercion.
-Style/DateTime:
-  Exclude:
-    - 'test/unit/context_unit_test.rb'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-Style/EachWithObject:
-  Exclude:
-    - 'performance/shopify/database.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/EmptyCaseCondition:
-  Exclude:
-    - 'lib/liquid/lexer.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: each, for
-Style/For:
-  Exclude:
-    - 'performance/shopify/shop_filter.rb'
-
-# Offense count: 9
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: format, sprintf, percent
-Style/FormatString:
-  Exclude:
-    - 'example/server/example_servlet.rb'
-    - 'performance/shopify/money_filter.rb'
-    - 'performance/shopify/weight_filter.rb'
-    - 'test/integration/filter_test.rb'
-    - 'test/integration/hash_ordering_test.rb'
-
-# Offense count: 115
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: always, never
-Style/FrozenStringLiteralComment:
-  Enabled: false
-
-# Offense count: 30
-# Cop supports --auto-correct.
-# Configuration parameters: IgnoreMacros, IgnoredMethods, IncludedMacros, AllowParenthesesInMultilineCall, AllowParenthesesInChaining, AllowParenthesesInCamelCaseMethod, EnforcedStyle.
-# SupportedStyles: require_parentheses, omit_parentheses
-Style/MethodCallWithArgsParentheses:
-  Exclude:
-    - 'Gemfile'
-    - 'Rakefile'
-    - 'lib/liquid/block_body.rb'
-    - 'lib/liquid/parser.rb'
-    - 'lib/liquid/tags/for.rb'
-    - 'liquid.gemspec'
-    - 'performance/shopify/database.rb'
-    - 'performance/shopify/liquid.rb'
-    - 'test/test_helper.rb'
-    - 'test/unit/condition_unit_test.rb'
-    - 'test/unit/tags/if_tag_unit_test.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, MinBodyLength.
-# SupportedStyles: skip_modifier_ifs, always
-Style/Next:
-  Exclude:
-    - 'lib/liquid/tags/for.rb'
-
-# Offense count: 52
-# Cop supports --auto-correct.
-Style/PerlBackrefs:
-  Enabled: false
-
-# Offense count: 33
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: compact, exploded
-Style/RaiseArgs:
-  Enabled: false
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/RedundantSelf:
-  Exclude:
-    - 'lib/liquid/strainer.rb'
-
-# Offense count: 5
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, AllowInnerSlashes.
-# SupportedStyles: slashes, percent_r, mixed
-Style/RegexpLiteral:
-  Exclude:
-    - 'lib/liquid/file_system.rb'
-    - 'lib/liquid/standardfilters.rb'
-    - 'performance/shopify/shop_filter.rb'
-    - 'test/unit/condition_unit_test.rb'
-
-# Offense count: 3
-# Cop supports --auto-correct.
-# Configuration parameters: ConvertCodeThatCanStartToReturnNil, Whitelist.
-# Whitelist: present?, blank?, presence, try, try!
-Style/SafeNavigation:
-  Exclude:
-    - 'lib/liquid/drop.rb'
-    - 'lib/liquid/strainer.rb'
-    - 'lib/liquid/tokenizer.rb'
-
-# Offense count: 10
-# Cop supports --auto-correct.
-# Configuration parameters: AllowAsExpressionSeparator.
-Style/Semicolon:
-  Exclude:
-    - 'performance/shopify/database.rb'
-    - 'test/integration/error_handling_test.rb'
-    - 'test/integration/template_test.rb'
-    - 'test/unit/context_unit_test.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: use_perl_names, use_english_names
-Style/SpecialGlobalVars:
-  Exclude:
-    - 'performance/shopify/liquid.rb'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: single_quotes, double_quotes
-Style/StringLiteralsInInterpolation:
-  Exclude:
-    - 'performance/shopify/tag_filter.rb'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, AllowSafeAssignment.
-# SupportedStyles: require_parentheses, require_no_parentheses, require_parentheses_when_complex
-Style/TernaryParentheses:
-  Exclude:
-    - 'lib/liquid/context.rb'
-    - 'lib/liquid/utils.rb'
-
-# Offense count: 21
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyleForMultiline.
-# SupportedStylesForMultiline: comma, consistent_comma, no_comma
-Style/TrailingCommaInArrayLiteral:
-  Exclude:
-    - 'lib/liquid/parse_tree_visitor.rb'
-    - 'lib/liquid/tags/include.rb'
-    - 'test/integration/parse_tree_visitor_test.rb'
-    - 'test/integration/standard_filter_test.rb'
-
-# Offense count: 9
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyleForMultiline.
-# SupportedStylesForMultiline: comma, consistent_comma, no_comma
-Style/TrailingCommaInHashLiteral:
-  Exclude:
-    - 'lib/liquid/condition.rb'
-    - 'lib/liquid/lexer.rb'
-    - 'lib/liquid/standardfilters.rb'
-    - 'performance/shopify/comment_form.rb'
-    - 'performance/shopify/database.rb'
-    - 'performance/shopify/paginate.rb'
-    - 'performance/theme_runner.rb'
-    - 'test/integration/output_test.rb'
-    - 'test/unit/context_unit_test.rb'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-Style/UnneededPercentQ:
-  Exclude:
-    - 'test/integration/error_handling_test.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/WhileUntilModifier:
-  Exclude:
-    - 'lib/liquid/tags/case.rb'
+    - 'lib/liquid/template.rb'
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,11 +4,9 @@ cache: bundler
 rvm:
  - 2.4
  - 2.5
-  - &latest_ruby 2.6
-  - 2.7
+  - 2.6
+  - &latest_ruby 2.7
  - ruby-head
-  - jruby-head
-  - truffleruby

 matrix:
  include:
@@ -17,8 +15,6 @@ matrix:
      name: Profiling Memory Usage
  allow_failures:
    - rvm: ruby-head
-    - rvm: jruby-head
-    - rvm: truffleruby

 branches:
  only:
--- a/6
+++ b/6
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 git_source(:github) do |repo_name|
  "https://github.com/#{repo_name}.git"
@@ -16,10 +18,10 @@ group :benchmark, :test do
 end

 group :test do
-  gem 'rubocop', '~> 0.74.0', require: false
+  gem 'rubocop', '~> 0.78.0', require: false
  gem 'rubocop-performance', require: false

  platform :mri, :truffleruby do
-    gem 'liquid-c', github: 'Shopify/liquid-c', ref: 'liquid-tag'
+    gem 'liquid-c', github: 'Shopify/liquid-c', ref: 'master'
  end
 end
--- a/History.md
+++ b/History.md
@@ -1,5 +1,11 @@
 # 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
--- a/README.md
+++ b/README.md
@@ -106,3 +106,9 @@ template = Liquid::Template.parse("{{x}} {{y}}")
 template.render!({ 'x' => 1}, { strict_variables: true })
 #=> Liquid::UndefinedVariable: Liquid error: undefined variable y
 ```
+
+### Usage tracking
+
+To help track usages of a feature or code path in production, we have released opt-in usage tracking. To enable this, we provide an empty `Liquid:: Usage.increment` method which you can customize to your needs. The feature is well suited to https://github.com/Shopify/statsd-instrument. However, the choice of implementation is up to you.
+
+Once you have enabled usage tracking, we recommend reporting any events through Github Issues that your system may be logging. It is highly likely this event has been added to consider deprecating or improving code specific to this event, so please raise any concerns.
--- a/18
+++ b/18
@@ -1,18 +1,20 @@
+# frozen_string_literal: true
+
 require 'rake'
 require 'rake/testtask'
-$LOAD_PATH.unshift File.expand_path("../lib", __FILE__)
+$LOAD_PATH.unshift(File.expand_path("../lib", __FILE__))
 require "liquid/version"

-task default: [:test, :rubocop]
+task(default: [:test, :rubocop])

-desc 'run test suite with default parser'
+desc('run test suite with default parser')
 Rake::TestTask.new(:base_test) do |t|
  t.libs << '.' << 'lib' << 'test'
  t.test_files = FileList['test/{integration,unit}/**/*_test.rb']
-  t.verbose = false
+  t.verbose    = false
 end

-desc 'run test suite with warn error mode'
+desc('run test suite with warn error mode')
 task :warn_test do
  ENV['LIQUID_PARSER_MODE'] = 'warn'
  Rake::Task['base_test'].invoke
@@ -25,7 +27,7 @@ task :rubocop do
  end
 end

-desc 'runs test suite with both strict and lax parsers'
+desc('runs test suite with both strict and lax parsers')
 task :test do
  ENV['LIQUID_PARSER_MODE'] = 'lax'
  Rake::Task['base_test'].invoke
@@ -47,7 +49,7 @@ task :test do
  end
 end

-task gem: :build
+task(gem: :build)
 task :build do
  system "gem build liquid.gemspec"
 end
@@ -94,7 +96,7 @@ namespace :memory_profile do
  end
 end

-desc "Run example"
+desc("Run example")
 task :example do
  ruby "-w -d -Ilib example/server/server.rb"
 end
--- a/example/server/example_servlet.rb
+++ b/example/server/example_servlet.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 module ProductsFilter
  def price(integer)
-    sprintf("$%.2d USD", integer / 100.0)
+    format("$%.2d USD", integer / 100.0)
  end

  def prettyprint(text)
--- a/example/server/liquid_servlet.rb
+++ b/example/server/liquid_servlet.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class LiquidServlet < WEBrick::HTTPServlet::AbstractServlet
  def do_GET(req, res)
    handle(:get, req, res)
@@ -9,17 +11,17 @@ class LiquidServlet < WEBrick::HTTPServlet::AbstractServlet

  private

-  def handle(type, req, res)
-    @request = req
+  def handle(_type, req, res)
+    @request  = req
    @response = res

    @request.path_info =~ /(\w+)\z/
-    @action = $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)
--- a/example/server/server.rb
+++ b/example/server/server.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'webrick'
 require 'rexml/document'

@@ -8,5 +10,5 @@ require_relative 'example_servlet'
 # Setup webrick
 server = WEBrick::HTTPServer.new(Port: ARGV[1] || 3000)
 server.mount('/', Servlet)
-trap("INT"){ server.shutdown }
+trap("INT") { server.shutdown }
 server.start
--- a/lib/liquid.rb
+++ b/lib/liquid.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (c) 2005 Tobias Luetke
 #
 # Permission is hereby granted, free of charge, to any person obtaining
@@ -21,10 +23,10 @@

 module Liquid
  FilterSeparator             = /\|/
-  ArgumentSeparator           = ','.freeze
-  FilterArgumentSeparator     = ':'.freeze
-  VariableAttributeSeparator  = '.'.freeze
-  WhitespaceControl           = '-'.freeze
+  ArgumentSeparator           = ','
+  FilterArgumentSeparator     = ':'
+  VariableAttributeSeparator  = '.'
+  WhitespaceControl           = '-'
  TagStart                    = /\{\%/
  TagEnd                      = /\%\}/
  VariableSignature           = /\(?[\w\-\.\[\]]\)?/
@@ -55,7 +57,8 @@ require 'liquid/forloop_drop'
 require 'liquid/extensions'
 require 'liquid/errors'
 require 'liquid/interrupts'
-require 'liquid/strainer'
+require 'liquid/strainer_factory'
+require 'liquid/strainer_template'
 require 'liquid/expression'
 require 'liquid/context'
 require 'liquid/parser_switching'
@@ -75,7 +78,12 @@ require 'liquid/utils'
 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
 #
 Dir["#{__dir__}/liquid/tags/*.rb"].each { |f| require f }
+Dir["#{__dir__}/liquid/registers/*.rb"].each { |f| require f }
--- a/lib/liquid/block.rb
+++ b/lib/liquid/block.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class Block < Tag
    MAX_DEPTH = 100
@@ -27,16 +29,16 @@ module Liquid
    end

    def unknown_tag(tag, _params, _tokens)
-      if tag == 'else'.freeze
-        raise SyntaxError.new(parse_context.locale.t("errors.syntax.unexpected_else".freeze,
-          block_name: block_name))
-      elsif tag.start_with?('end'.freeze)
-        raise SyntaxError.new(parse_context.locale.t("errors.syntax.invalid_delimiter".freeze,
+      if tag == 'else'
+        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_else",
+          block_name: block_name)
+      elsif tag.start_with?('end')
+        raise SyntaxError, parse_context.locale.t("errors.syntax.invalid_delimiter",
          tag: tag,
          block_name: block_name,
-          block_delimiter: block_delimiter))
+          block_delimiter: block_delimiter)
      else
-        raise SyntaxError.new(parse_context.locale.t("errors.syntax.unknown_tag".freeze, tag: tag))
+        raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag", tag: tag)
      end
    end

@@ -52,7 +54,7 @@ module Liquid

    def parse_body(body, tokens)
      if parse_context.depth >= MAX_DEPTH
-        raise StackLevelError, "Nesting too deep".freeze
+        raise StackLevelError, "Nesting too deep"
      end
      parse_context.depth += 1
      begin
@@ -61,7 +63,7 @@ module Liquid

          return false if end_tag_name == block_delimiter
          unless end_tag_name
-            raise SyntaxError.new(parse_context.locale.t("errors.syntax.tag_never_closed".freeze, block_name: block_name))
+            raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
          end

          # this tag is not registered with the system
--- a/lib/liquid/block_body.rb
+++ b/lib/liquid/block_body.rb
@@ -1,17 +1,21 @@
+# 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 = "{%".freeze
-    VARSTART = "{{".freeze
+    TAGSTART            = "{%"
+    VARSTART            = "{{"

    attr_reader :nodelist

    def initialize
      @nodelist = []
-      @blank = true
+      @blank    = true
    end

    def parse(tokenizer, parse_context, &block)
@@ -25,16 +29,16 @@ 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
            # caller raise a syntax error
            return yield token, token
          end
-          tag_name = $1
-          markup = $2
-          unless tag = registered_tags[tag_name]
+          tag_name = Regexp.last_match(1)
+          markup   = Regexp.last_match(2)
+          unless (tag = registered_tags[tag_name])
            # end parsing if we reach an unknown tag and let the caller decide
            # determine how to proceed
            return yield tag_name, markup
@@ -49,8 +53,23 @@ 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)
@@ -58,21 +77,21 @@ module Liquid
          unless token =~ FullToken
            raise_missing_tag_terminator(token, parse_context)
          end
-          tag_name = $2
-          markup = $4
+          tag_name = Regexp.last_match(2)
+          markup   = Regexp.last_match(4)

          if parse_context.line_number
            # newlines inside the tag should increase the line number,
            # particularly important for multiline {% liquid %} tags
-            parse_context.line_number += $1.count("\n".freeze) + $3.count("\n".freeze)
+            parse_context.line_number += Regexp.last_match(1).count("\n") + Regexp.last_match(3).count("\n")
          end

-          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)
+          if tag_name == 'liquid'
+            parse_liquid_tag(markup, parse_context, &block)
+            next
          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
@@ -101,7 +120,7 @@ module Liquid
    def whitespace_handler(token, parse_context)
      if token[2] == WhitespaceControl
        previous_token = @nodelist.last
-        if previous_token.is_a? String
+        if previous_token.is_a?(String)
          previous_token.rstrip!
        end
      end
@@ -113,14 +132,14 @@ 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
@@ -129,7 +148,7 @@ 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
@@ -152,7 +171,13 @@ module Liquid
    private

    def render_node(context, output, node)
-      node.render_to_output_buffer(context, output)
+      if node.disabled?(context)
+        output << node.disabled_error_message
+        return
+      end
+      disable_tags(context, node.disabled_tags) do
+        node.render_to_output_buffer(context, output)
+      end
    rescue UndefinedVariable, UndefinedDropMethod, UndefinedFilter => e
      context.handle_error(e, node.line_number)
    rescue ::StandardError => e
@@ -160,10 +185,15 @@ module Liquid
      output << context.handle_error(e, line_number)
    end

+    def disable_tags(context, tags, &block)
+      return yield if tags.empty?
+      context.registers[:disabled_tags].disable(tags, &block)
+    end
+
    def raise_if_resource_limits_reached(context, length)
      context.resource_limits.render_length += length
      return unless context.resource_limits.reached?
-      raise MemoryError.new("Memory limits exceeded".freeze)
+      raise MemoryError, "Memory limits exceeded"
    end

    def create_variable(token, parse_context)
@@ -175,11 +205,11 @@ module Liquid
    end

    def raise_missing_tag_terminator(token, parse_context)
-      raise SyntaxError.new(parse_context.locale.t("errors.syntax.tag_termination".freeze, token: token, tag_end: TagEnd.inspect))
+      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination", token: token, tag_end: TagEnd.inspect)
    end

    def raise_missing_variable_terminator(token, parse_context)
-      raise SyntaxError.new(parse_context.locale.t("errors.syntax.variable_termination".freeze, token: token, tag_end: VariableEnd.inspect))
+      raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination", token: token, tag_end: VariableEnd.inspect)
    end

    def registered_tags
--- a/lib/liquid/condition.rb
+++ b/lib/liquid/condition.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Container for liquid nodes which conveniently wraps decision making logic
  #
@@ -8,21 +10,21 @@ module Liquid
  #
  class Condition #:nodoc:
    @@operators = {
-      '=='.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|
+      '==' => ->(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|
        if left && right && left.respond_to?(:include?)
          right = right.to_s if left.is_a?(String)
          left.include?(right)
        else
          false
        end
-      end
+      end,
    }

    def self.operators
@@ -33,9 +35,10 @@ module Liquid
    attr_accessor :left, :operator, :right

    def initialize(left = nil, operator = nil, right = nil)
-      @left = left
+      @left     = left
      @operator = operator
-      @right = right
+      @right    = right
+
      @child_relation  = nil
      @child_condition = nil
    end
@@ -60,12 +63,12 @@ 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

@@ -78,7 +81,7 @@ module Liquid
    end

    def inspect
-      "#<Condition #{[@left, @operator, @right].compact.join(' '.freeze)}>"
+      "#<Condition #{[@left, @operator, @right].compact.join(' ')}>"
    end

    protected
@@ -113,10 +116,10 @@ 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.new("Unknown operator #{op}"))
+      operation = self.class.operators[op] || raise(Liquid::ArgumentError, "Unknown operator #{op}")

      if operation.respond_to?(:call)
        operation.call(self, left, right)
@@ -124,7 +127,7 @@ module Liquid
        begin
          left.send(operation, right)
        rescue ::ArgumentError => e
-          raise Liquid::ArgumentError.new(e.message)
+          raise Liquid::ArgumentError, e.message
        end
      end
    end
--- a/lib/liquid/context.rb
+++ b/lib/liquid/context.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Context keeps the variable stack and resolves variables, as well as keywords
  #
@@ -16,18 +18,17 @@ 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_registers: {}, static_environments: {})
-      new(environments, outer_scope, registers, rethrow_errors, resource_limits, static_registers, static_environments)
+    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)
    end

-    def initialize(environments = {}, outer_scope = {}, registers = {}, rethrow_errors = false, resource_limits = nil, static_registers = {}, static_environments = {})
+    def initialize(environments = {}, outer_scope = {}, registers = {}, rethrow_errors = false, resource_limits = nil, static_environments = {})
      @environments = [environments]
      @environments.flatten!

      @static_environments = [static_environments].flat_map(&:freeze).freeze
      @scopes              = [(outer_scope || {})]
      @registers           = registers
-      @static_registers    = static_registers.freeze
      @errors              = []
      @partial             = false
      @strict_variables    = false
@@ -35,15 +36,13 @@ module Liquid
      @base_scope_depth    = 0
      squash_instance_assigns_with_environments

-      @this_stack_used = false
-
      self.exception_renderer = Template.default_exception_renderer
      if rethrow_errors
-        self.exception_renderer = ->(e) { raise }
+        self.exception_renderer = ->(_e) { raise }
      end

-      @interrupts = []
-      @filters = []
+      @interrupts    = []
+      @filters       = []
      @global_filter = nil
    end
    # rubocop:enable Metrics/ParameterLists
@@ -53,7 +52,7 @@ module Liquid
    end

    def strainer
-      @strainer ||= Strainer.create(self, @filters)
+      @strainer ||= StrainerFactory.create(self, @filters)
    end

    # Adds filters to this context.
@@ -88,7 +87,7 @@ 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
@@ -122,19 +121,11 @@ module Liquid
    #   end
    #
    #   context['var]  #=> nil
-    def stack(new_scope = nil)
-      old_stack_used = @this_stack_used
-      if new_scope
-        push(new_scope)
-        @this_stack_used = true
-      else
-        @this_stack_used = false
-      end
-
+    def stack(new_scope = {})
+      push(new_scope)
      yield
    ensure
-      pop if @this_stack_used
-      @this_stack_used = old_stack_used
+      pop
    end

    # Creates a new context inheriting resource limits, filters, environment etc.,
@@ -145,13 +136,13 @@ module Liquid
      Context.build(
        resource_limits: resource_limits,
        static_environments: static_environments,
-        static_registers: static_registers
+        registers: StaticRegisters.new(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
      end
    end
@@ -162,10 +153,6 @@ module Liquid

    # Only allow String, Numeric, Hash, Array, Proc, Boolean or <tt>Liquid::Drop</tt>
    def []=(key, value)
-      unless @this_stack_used
-        @this_stack_used = true
-        push({})
-      end
      @scopes[0][key] = value
    end

@@ -201,7 +188,7 @@ 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
@@ -215,7 +202,7 @@ module Liquid
      value = obj[key]

      if value.is_a?(Proc) && obj.respond_to?(:[]=)
-        obj[key] = (value.arity == 0) ? value.call : value.call(self)
+        obj[key] = value.arity == 0 ? value.call : value.call(self)
      else
        value
      end
@@ -246,7 +233,7 @@ module Liquid
    end

    def check_overflow
-      raise StackLevelError, "Nesting too deep".freeze if overflow?
+      raise StackLevelError, "Nesting too deep" if overflow?
    end

    def overflow?
--- a/lib/liquid/document.rb
+++ b/lib/liquid/document.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class Document < BlockBody
    def self.parse(tokens, parse_context)
@@ -7,7 +9,7 @@ module Liquid
    end

    def parse(tokens, parse_context)
-      super do |end_tag_name, end_tag_params|
+      super do |end_tag_name, _end_tag_params|
        unknown_tag(end_tag_name, parse_context) if end_tag_name
      end
    rescue SyntaxError => e
@@ -17,10 +19,10 @@ module Liquid

    def unknown_tag(tag, parse_context)
      case tag
-      when 'else'.freeze, 'end'.freeze
-        raise SyntaxError.new(parse_context.locale.t("errors.syntax.unexpected_outer_tag".freeze, tag: tag))
+      when 'else', 'end'
+        raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_outer_tag", tag: tag)
      else
-        raise SyntaxError.new(parse_context.locale.t("errors.syntax.unknown_tag".freeze, tag: tag))
+        raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag", tag: tag)
      end
    end
  end
--- a/lib/liquid/drop.rb
+++ b/lib/liquid/drop.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'set'

 module Liquid
@@ -25,7 +27,7 @@ module Liquid

    # Catch all for the method
    def liquid_method_missing(method)
-      return nil unless @context && @context.strict_variables
+      return nil unless @context&.strict_variables
      raise Liquid::UndefinedDropMethod, "undefined method #{method}"
    end

@@ -67,7 +69,7 @@ module Liquid

        if include?(Enumerable)
          blacklist += Enumerable.public_instance_methods
-          blacklist -= [:sort, :count, :first, :min, :max, :include?]
+          blacklist -= [:sort, :count, :first, :min, :max]
        end

        whitelist = [:to_liquid] + (public_instance_methods - blacklist)
--- a/lib/liquid/errors.rb
+++ b/lib/liquid/errors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class Error < ::StandardError
    attr_accessor :line_number
@@ -5,7 +7,7 @@ module Liquid
    attr_accessor :markup_context

    def to_s(with_prefix = true)
-      str = ""
+      str = +""
      str << message_prefix if with_prefix
      str << super()

@@ -20,11 +22,11 @@ module Liquid
    private

    def message_prefix
-      str = ""
-      if is_a?(SyntaxError)
-        str << "Liquid syntax error"
+      str = +""
+      str << if is_a?(SyntaxError)
+        "Liquid syntax error"
      else
-        str << "Liquid error"
+        "Liquid error"
      end

      if line_number
@@ -38,19 +40,19 @@ 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)
-  TaintedError = 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)
-  InternalError = Class.new(Error)
+  InternalError       = Class.new(Error)
 end
--- a/lib/liquid/expression.rb
+++ b/lib/liquid/expression.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class Expression
    class MethodLiteral
@@ -14,11 +16,11 @@ module Liquid
    end

    LITERALS = {
-      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
+      nil => nil, 'nil' => nil, 'null' => nil, '' => nil,
+      'true' => true,
+      'false' => false,
+      'blank' => MethodLiteral.new(:blank?, '').freeze,
+      'empty' => MethodLiteral.new(:empty?, '').freeze
    }.freeze

    SINGLE_QUOTED_STRING = /\A'(.*)'\z/m
@@ -33,13 +35,13 @@ module Liquid
      else
        case markup
        when SINGLE_QUOTED_STRING, DOUBLE_QUOTED_STRING
-          $1
+          Regexp.last_match(1)
        when INTEGERS_REGEX
-          $1.to_i
+          Regexp.last_match(1).to_i
        when RANGES_REGEX
-          RangeLookup.parse($1, $2)
+          RangeLookup.parse(Regexp.last_match(1), Regexp.last_match(2))
        when FLOATS_REGEX
-          $1.to_f
+          Regexp.last_match(1).to_f
        else
          VariableLookup.parse(markup)
        end
--- a/lib/liquid/extensions.rb
+++ b/lib/liquid/extensions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'time'
 require 'date'

--- a/lib/liquid/file_system.rb
+++ b/lib/liquid/file_system.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # A Liquid file system is a way to let your templates retrieve other templates for use with the include tag.
  #
@@ -44,8 +46,8 @@ module Liquid
  class LocalFileSystem
    attr_accessor :root

-    def initialize(root, pattern = "_%s.liquid".freeze)
-      @root = root
+    def initialize(root, pattern = "_%s.liquid")
+      @root    = root
      @pattern = pattern
    end

@@ -57,9 +59,9 @@ module Liquid
    end

    def full_path(template_path)
-      raise FileSystemError, "Illegal template name '#{template_path}'" unless template_path =~ /\A[^.\/][a-zA-Z0-9_\/]+\z/
+      raise FileSystemError, "Illegal template name '#{template_path}'" unless %r{\A[^./][a-zA-Z0-9_/]+\z}.match?(template_path)

-      full_path = if template_path.include?('/'.freeze)
+      full_path = if template_path.include?('/')
        File.join(root, File.dirname(template_path), @pattern % File.basename(template_path))
      else
        File.join(root, @pattern % template_path)
--- a/lib/liquid/forloop_drop.rb
+++ b/lib/liquid/forloop_drop.rb
@@ -1,10 +1,12 @@
+# 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
--- a/lib/liquid/i18n.rb
+++ b/lib/liquid/i18n.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'yaml'

 module Liquid
@@ -26,13 +28,13 @@ module Liquid
    def interpolate(name, vars)
      name.gsub(/%\{(\w+)\}/) do
        # raise TranslationError, "Undefined key #{$1} for interpolation in translation #{name}"  unless vars[$1.to_sym]
-        (vars[$1.to_sym]).to_s
+        (vars[Regexp.last_match(1).to_sym]).to_s
      end
    end

    def deep_fetch_translation(name)
-      name.split('.'.freeze).reduce(locale) do |level, cur|
-        level[cur] or raise TranslationError, "Translation for #{name} does not exist in locale #{path}"
+      name.split('.').reduce(locale) do |level, cur|
+        level[cur] || raise(TranslationError, "Translation for #{name} does not exist in locale #{path}")
      end
    end
  end
--- a/lib/liquid/interrupts.rb
+++ b/lib/liquid/interrupts.rb
@@ -1,10 +1,12 @@
+# 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".freeze
+      @message = message || "interrupt"
    end
  end

--- a/lib/liquid/lexer.rb
+++ b/lib/liquid/lexer.rb
@@ -1,24 +1,26 @@
+# frozen_string_literal: true
+
 require "strscan"
 module Liquid
  class Lexer
    SPECIALS = {
-      '|'.freeze => :pipe,
-      '.'.freeze => :dot,
-      ':'.freeze => :colon,
-      ','.freeze => :comma,
-      '['.freeze => :open_square,
-      ']'.freeze => :close_square,
-      '('.freeze => :open_round,
-      ')'.freeze => :close_round,
-      '?'.freeze => :question,
-      '-'.freeze => :dash
+      '|' => :pipe,
+      '.' => :dot,
+      ':' => :colon,
+      ',' => :comma,
+      '[' => :open_square,
+      ']' => :close_square,
+      '(' => :open_round,
+      ')' => :close_round,
+      '?' => :question,
+      '-' => :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)
@@ -31,16 +33,21 @@ module Liquid
      until @ss.eos?
        @ss.skip(WHITESPACE_OR_NOTHING)
        break if @ss.eos?
-        tok = case
-        when t = @ss.scan(COMPARISON_OPERATOR) then [:comparison, t]
-        when t = @ss.scan(SINGLE_STRING_LITERAL) then [:string, t]
-        when t = @ss.scan(DOUBLE_STRING_LITERAL) then [:string, t]
-        when t = @ss.scan(NUMBER_LITERAL) then [:number, t]
-        when t = @ss.scan(IDENTIFIER) then [:id, t]
-        when t = @ss.scan(DOTDOT) then [:dotdot, t]
+        tok      = if (t = @ss.scan(COMPARISON_OPERATOR))
+          [:comparison, t]
+        elsif (t = @ss.scan(SINGLE_STRING_LITERAL))
+          [:string, t]
+        elsif (t = @ss.scan(DOUBLE_STRING_LITERAL))
+          [:string, t]
+        elsif (t = @ss.scan(NUMBER_LITERAL))
+          [:number, t]
+        elsif (t = @ss.scan(IDENTIFIER))
+          [:id, t]
+        elsif (t = @ss.scan(DOTDOT))
+          [:dotdot, t]
        else
-          c = @ss.getch
-          if s = SPECIALS[c]
+          c     = @ss.getch
+          if (s = SPECIALS[c])
            [s, c]
          else
            raise SyntaxError, "Unexpected character #{c}"
--- a/lib/liquid/locales/en.yml
+++ b/lib/liquid/locales/en.yml
@@ -25,3 +25,5 @@
      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"
--- a/lib/liquid/parse_context.rb
+++ b/lib/liquid/parse_context.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class ParseContext
    attr_accessor :locale, :line_number, :trim_whitespace, :depth
@@ -5,9 +7,11 @@ 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

@@ -18,8 +22,8 @@ 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
@@ -28,7 +32,7 @@ module Liquid
        if dont_pass == true
          { locale: locale }
        elsif dont_pass.is_a?(Array)
-          @template_options.reject { |k, v| dont_pass.include?(k) }
+          @template_options.reject { |k, _v| dont_pass.include?(k) }
        else
          @template_options
        end
--- a/lib/liquid/parse_tree_visitor.rb
+++ b/lib/liquid/parse_tree_visitor.rb
@@ -11,7 +11,7 @@ module Liquid
    end

    def initialize(node, callbacks)
-      @node = node
+      @node      = node
      @callbacks = callbacks
    end

@@ -28,7 +28,7 @@ module Liquid
        item, new_context = @callbacks[node.class].call(node, context)
        [
          item,
-          ParseTreeVisitor.for(node, @callbacks).visit(new_context || context)
+          ParseTreeVisitor.for(node, @callbacks).visit(new_context || context),
        ]
      end
    end
--- a/lib/liquid/parser.rb
+++ b/lib/liquid/parser.rb
@@ -1,9 +1,11 @@
+# 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)
@@ -51,7 +53,7 @@ module Liquid
      token = @tokens[@p]
      if token[0] == :id
        variable_signature
-      elsif SINGLE_TOKEN_EXPRESSION_TYPES.include? token[0]
+      elsif SINGLE_TOKEN_EXPRESSION_TYPES.include?(token[0])
        consume
      elsif token.first == :open_round
        consume
@@ -66,10 +68,10 @@ module Liquid
    end

    def argument
-      str = ""
+      str = +""
      # might be a keyword argument (identifier: expression)
      if look(:id) && look(:colon, 1)
-        str << consume << consume << ' '.freeze
+        str << consume << consume << ' '
      end

      str << expression
--- a/lib/liquid/parser_switching.rb
+++ b/lib/liquid/parser_switching.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  module ParserSwitching
    def parse_with_selected_parser(markup)
@@ -6,10 +8,10 @@ module Liquid
      when :lax    then lax_parse(markup)
      when :warn
        begin
-          return strict_parse_with_error_context(markup)
+          strict_parse_with_error_context(markup)
        rescue SyntaxError => e
          parse_context.warnings << e
-          return lax_parse(markup)
+          lax_parse(markup)
        end
      end
    end
@@ -19,7 +21,7 @@ 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
--- a/lib/liquid/partial_cache.rb
+++ b/lib/liquid/partial_cache.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class PartialCache
    def self.load(template_name, context:, parse_context:)
@@ -6,10 +8,14 @@ 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

-      partial = Liquid::Template.parse(source, parse_context)
+      template_factory = (context.registers[:template_factory] ||= Liquid::TemplateFactory.new)
+      template = template_factory.for(template_name)
+
+      partial = template.parse(source, parse_context)
      cached_partials[template_name] = partial
    ensure
      parse_context.partial = false
--- a/lib/liquid/profiler.rb
+++ b/lib/liquid/profiler.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'liquid/profiler/hooks'

 module Liquid
@@ -44,7 +46,7 @@ module Liquid
    include Enumerable

    class Timing
-      attr_reader :code, :partial, :line_number, :children
+      attr_reader :code, :partial, :line_number, :children, :total_time, :self_time

      def initialize(node, partial)
        @code        = node.respond_to?(:raw) ? node.raw : node
@@ -62,7 +64,18 @@ module Liquid
      end

      def finish
-        @end_time = Time.now
+        @end_time   = Time.now
+        @total_time = @end_time - @start_time
+
+        if @children.empty?
+          @self_time = @total_time
+        else
+          total_children_time = 0
+          @children.each do |child|
+            total_children_time += child.total_time
+          end
+          @self_time = @total_time - total_children_time
+        end
      end

      def render_time
@@ -96,14 +109,14 @@ module Liquid
      Thread.current[:liquid_profiler]
    end

-    def initialize
-      @partial_stack = ["<root>"]
+    def initialize(partial_name = "<root>")
+      @partial_stack = [partial_name]

-      @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
--- a/lib/liquid/profiler/hooks.rb
+++ b/lib/liquid/profiler/hooks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class BlockBody
    def render_node_with_profiling(context, output, node)
--- a/lib/liquid/range_lookup.rb
+++ b/lib/liquid/range_lookup.rb
@@ -1,8 +1,10 @@
+# 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
@@ -12,12 +14,12 @@ 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

--- a/lib/liquid/register.rb
+++ b/lib/liquid/register.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+module Liquid
+  class Register
+  end
+end
--- a/lib/liquid/registers/disabled_tags.rb
+++ b/lib/liquid/registers/disabled_tags.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+module Liquid
+  class DisabledTags < Register
+    def initialize
+      @disabled_tags = {}
+    end
+
+    def disabled?(tag)
+      @disabled_tags.key?(tag) && @disabled_tags[tag] > 0
+    end
+
+    def disable(tags)
+      tags.each(&method(:increment))
+      yield
+    ensure
+      tags.each(&method(:decrement))
+    end
+
+    private
+
+    def increment(tag)
+      @disabled_tags[tag] ||= 0
+      @disabled_tags[tag]  += 1
+    end
+
+    def decrement(tag)
+      @disabled_tags[tag] -= 1
+    end
+  end
+
+  Template.add_register(:disabled_tags, DisabledTags.new)
+end
--- a/lib/liquid/resource_limits.rb
+++ b/lib/liquid/resource_limits.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class ResourceLimits
    attr_accessor :render_length, :render_score, :assign_score,
@@ -5,8 +7,8 @@ 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

--- a/lib/liquid/standardfilters.rb
+++ b/lib/liquid/standardfilters.rb
@@ -1,20 +1,22 @@
+# frozen_string_literal: true
+
 require 'cgi'
 require 'bigdecimal'

 module Liquid
  module StandardFilters
    HTML_ESCAPE = {
-      '&'.freeze => '&amp;'.freeze,
-      '>'.freeze => '&gt;'.freeze,
-      '<'.freeze => '&lt;'.freeze,
-      '"'.freeze => '&quot;'.freeze,
-      "'".freeze => '&#39;'.freeze
+      '&' => '&amp;',
+      '>' => '&gt;',
+      '<' => '&lt;',
+      '"' => '&quot;',
+      "'" => '&#39;',
    }.freeze
    HTML_ESCAPE_ONCE_REGEXP = /["><']|&(?!([a-zA-Z]+|(#\d+));)/
-    STRIP_HTML_BLOCKS = Regexp.union(
-      /<script.*?<\/script>/m,
+    STRIP_HTML_BLOCKS       = Regexp.union(
+      %r{<script.*?</script>}m,
      /<!--.*?-->/m,
-      /<style.*?<\/style>/m
+      %r{<style.*?</style>}m
    )
    STRIP_HTML_TAGS = /<.*?>/m

@@ -72,23 +74,28 @@ module Liquid
    end

    # Truncate a string down to x characters
-    def truncate(input, length = 50, truncate_string = "...".freeze)
+    def truncate(input, length = 50, truncate_string = "...")
      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 = "...".freeze)
+    def truncatewords(input, words = 15, truncate_string = "...")
      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(" ".freeze).concat(truncate_string.to_s) : input
+
+      wordlist.length > l ? wordlist[0..l].join(" ").concat(truncate_string.to_s) : input
    end

    # Split input string into an array of substrings separated by given pattern.
@@ -113,7 +120,7 @@ module Liquid
    end

    def strip_html(input)
-      empty = ''.freeze
+      empty  = ''
      result = input.to_s.gsub(STRIP_HTML_BLOCKS, empty)
      result.gsub!(STRIP_HTML_TAGS, empty)
      result
@@ -121,18 +128,18 @@ module Liquid

    # Remove all newlines from the string
    def strip_newlines(input)
-      input.to_s.gsub(/\r?\n/, ''.freeze)
+      input.to_s.gsub(/\r?\n/, '')
    end

    # Join elements of the array with certain character between them
-    def join(input, glue = ' '.freeze)
-      InputIterator.new(input).join(glue)
+    def join(input, glue = ' ')
+      InputIterator.new(input, context).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)
+      ary = InputIterator.new(input, context)

      return [] if ary.empty?

@@ -152,7 +159,7 @@ 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)
+      ary = InputIterator.new(input, context)

      return [] if ary.empty?

@@ -172,7 +179,7 @@ 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)
+      ary = InputIterator.new(input, context)

      if ary.empty?
        []
@@ -194,7 +201,7 @@ 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)
+      ary = InputIterator.new(input, context)

      if property.nil?
        ary.uniq
@@ -211,16 +218,16 @@ module Liquid

    # Reverse the elements of an array
    def reverse(input)
-      ary = InputIterator.new(input)
+      ary = InputIterator.new(input, context)
      ary.reverse
    end

    # map/collect on a given property
    def map(input, property)
-      InputIterator.new(input).map do |e|
+      InputIterator.new(input, context).map do |e|
        e = e.call if e.is_a?(Proc)

-        if property == "to_liquid".freeze
+        if property == "to_liquid"
          e
        elsif e.respond_to?(:[])
          r = e[property]
@@ -234,7 +241,7 @@ 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)
+      ary = InputIterator.new(input, context)

      if property.nil?
        ary.compact
@@ -250,23 +257,23 @@ module Liquid
    end

    # Replace occurrences of a string with another
-    def replace(input, string, replacement = ''.freeze)
+    def replace(input, string, replacement = '')
      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 = ''.freeze)
+    def replace_first(input, string, replacement = '')
      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, ''.freeze)
+      input.to_s.gsub(string.to_s, '')
    end

    # remove the first occurrences of a substring
    def remove_first(input, string)
-      input.to_s.sub(string.to_s, ''.freeze)
+      input.to_s.sub(string.to_s, '')
    end

    # add one string to another
@@ -276,9 +283,9 @@ module Liquid

    def concat(input, array)
      unless array.respond_to?(:to_ary)
-        raise ArgumentError.new("concat filter requires an array argument")
+        raise ArgumentError, "concat filter requires an array argument"
      end
-      InputIterator.new(input).concat(array)
+      InputIterator.new(input, context).concat(array)
    end

    # prepend a string to another
@@ -288,7 +295,7 @@ 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".freeze)
+      input.to_s.gsub(/\n/, "<br />\n")
    end

    # Reformat a date using Ruby's core Time#strftime( string ) -> string
@@ -325,7 +332,7 @@ 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
@@ -391,17 +398,6 @@ module Liquid
      raise Liquid::FloatDomainError, e.message
    end

-    # Defaults are passed as nil so systems can easily override
-    def format_number(input, options = {})
-      options = {} unless options.is_a?(Hash)
-      precision = options['precision'] || 2
-      delimiter = options['delimiter'] || " ".freeze
-      separator = options['separator'] || ".".freeze
-      return input if (prec = Utils.to_number(precision).to_i) < 0
-      whole_part, decimal_part = Kernel.format("%.#{prec}f", Utils.to_number(input)).split('.')
-      [whole_part.gsub(/(\d)(?=\d{3}+$)/, "\\1#{delimiter}"), decimal_part].compact.join(separator.to_s)
-    end
-
    def ceil(input)
      Utils.to_number(input).ceil.to_i
    rescue ::FloatDomainError => e
@@ -430,18 +426,28 @@ module Liquid
      result.is_a?(BigDecimal) ? result.to_f : result
    end

-    def default(input, default_value = ''.freeze)
-      if !input || input.respond_to?(:empty?) && input.empty?
-        default_value
-      else
-        input
-      end
+    # Set a default value when the input is nil, false or empty
+    #
+    # Example:
+    #    {{ product.title | default: "No Title" }}
+    #
+    # Use `allow_false` when an input should only be tested against nil or empty and not false.
+    #
+    # Example:
+    #    {{ product.title | default: "No Title", allow_false: true }}
+    #
+    def default(input, default_value = '', options = {})
+      options = {} unless options.is_a?(Hash)
+      false_check = options['allow_false'] ? input.nil? : !input
+      false_check || (input.respond_to?(:empty?) && input.empty?) ? default_value : input
    end

    private

+    attr_reader :context
+
    def raise_property_error(property)
-      raise Liquid::ArgumentError.new("cannot select the property '#{property}'")
+      raise Liquid::ArgumentError, "cannot select the property '#{property}'"
    end

    def apply_operation(input, operand, operation)
@@ -468,8 +474,9 @@ module Liquid
    class InputIterator
      include Enumerable

-      def initialize(input)
-        @input = if input.is_a?(Array)
+      def initialize(input, context)
+        @context = context
+        @input   = if input.is_a?(Array)
          input.flatten
        elsif input.is_a?(Hash)
          [input]
@@ -507,6 +514,7 @@ 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
--- a/lib/liquid/static_registers.rb
+++ b/lib/liquid/static_registers.rb
@@ -0,0 +1,44 @@
+# 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
--- a/lib/liquid/strainer.rb
+++ b/lib/liquid/strainer.rb
@@ -1,66 +0,0 @@
-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 self.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 && @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
--- a/lib/liquid/strainer_factory.rb
+++ b/lib/liquid/strainer_factory.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module Liquid
+  # StrainerFactory is the factory for the filters system.
+  module StrainerFactory
+    extend self
+
+    def add_global_filter(filter)
+      strainer_class_cache.clear
+      global_filters << filter
+    end
+
+    def create(context, filters = [])
+      strainer_from_cache(filters).new(context)
+    end
+
+    private
+
+    def global_filters
+      @global_filters ||= []
+    end
+
+    def strainer_from_cache(filters)
+      strainer_class_cache[filters] ||= begin
+        klass = Class.new(StrainerTemplate)
+        global_filters.each { |f| klass.add_filter(f) }
+        filters.each { |f| klass.add_filter(f) }
+        klass
+      end
+    end
+
+    def strainer_class_cache
+      @strainer_class_cache ||= {}
+    end
+  end
+end
--- a/lib/liquid/strainer_template.rb
+++ b/lib/liquid/strainer_template.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require 'set'
+
+module Liquid
+  # StrainerTemplate is the computed class for the filters system.
+  # New filters are mixed into the strainer class which is then instantiated for each liquid template render run.
+  #
+  # The Strainer only allows method calls defined in filters given to it via StrainerFactory.add_global_filter,
+  # Context#add_filters or Template.register_filter
+  class StrainerTemplate
+    def initialize(context)
+      @context = context
+    end
+
+    class << self
+      def add_filter(filter)
+        return if include?(filter)
+
+        invokable_non_public_methods = (filter.private_instance_methods + filter.protected_instance_methods).select { |m| invokable?(m) }
+        if invokable_non_public_methods.any?
+          raise MethodOverrideError, "Filter overrides registered public methods as non public: #{invokable_non_public_methods.join(', ')}"
+        end
+
+        include(filter)
+
+        filter_methods.merge(filter.public_instance_methods.map(&:to_s))
+      end
+
+      def invokable?(method)
+        filter_methods.include?(method.to_s)
+      end
+
+      private
+
+      def filter_methods
+        @filter_methods ||= Set.new
+      end
+    end
+
+    def invoke(method, *args)
+      if self.class.invokable?(method)
+        send(method, *args)
+      elsif @context.strict_filters
+        raise Liquid::UndefinedFilter, "undefined filter #{method}"
+      else
+        args.first
+      end
+    rescue ::ArgumentError => e
+      raise Liquid::ArgumentError, e.message, e.backtrace
+    end
+  end
+end
--- a/lib/liquid/tablerowloop_drop.rb
+++ b/lib/liquid/tablerowloop_drop.rb
@@ -1,11 +1,13 @@
+# 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
--- a/lib/liquid/tag.rb
+++ b/lib/liquid/tag.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class Tag
    attr_reader :nodelist, :tag_name, :line_number, :parse_context
@@ -11,14 +13,22 @@ module Liquid
        tag
      end

+      def disable_tags(*tags)
+        disabled_tags.push(*tags)
+      end
+
      private :new
+
+      def disabled_tags
+        @disabled_tags ||= []
+      end
    end

    def initialize(tag_name, markup, parse_context)
-      @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)
@@ -33,7 +43,15 @@ module Liquid
    end

    def render(_context)
-      ''.freeze
+      ''
+    end
+
+    def disabled?(context)
+      context.registers[:disabled_tags].disabled?(tag_name)
+    end
+
+    def disabled_error_message
+      "#{tag_name} #{options[:locale].t('errors.disabled.tag')}"
    end

    # For backwards compatibility with custom tags. In a future release, the semantics
@@ -47,5 +65,9 @@ module Liquid
    def blank?
      false
    end
+
+    def disabled_tags
+      self.class.disabled_tags
+    end
  end
 end
--- a/lib/liquid/tags/assign.rb
+++ b/lib/liquid/tags/assign.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Assign sets a variable in your template.
  #
@@ -10,19 +12,15 @@ 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 = $1
-        @from = Variable.new($2, options)
+        @to   = Regexp.last_match(1)
+        @from = Variable.new(Regexp.last_match(2), options)
      else
-        raise SyntaxError.new(options[:locale].t(self.class.syntax_error_translation_key))
+        raise SyntaxError, options[:locale].t('errors.syntax.assign')
      end
    end

@@ -59,5 +57,5 @@ module Liquid
    end
  end

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

-  Template.register_tag('break'.freeze, Break)
+  Template.register_tag('break', Break)
 end
--- a/lib/liquid/tags/capture.rb
+++ b/lib/liquid/tags/capture.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Capture stores the result of a block into a variable without rendering it inplace.
  #
@@ -16,9 +18,9 @@ module Liquid
    def initialize(tag_name, markup, options)
      super
      if markup =~ Syntax
-        @to = $1
+        @to = Regexp.last_match(1)
      else
-        raise SyntaxError.new(options[:locale].t("errors.syntax.capture"))
+        raise SyntaxError, options[:locale].t("errors.syntax.capture")
      end
    end

@@ -35,5 +37,5 @@ module Liquid
    end
  end

-  Template.register_tag('capture'.freeze, Capture)
+  Template.register_tag('capture', Capture)
 end
--- a/lib/liquid/tags/case.rb
+++ b/lib/liquid/tags/case.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class Case < Block
    Syntax     = /(#{QuotedFragment})/o
@@ -10,17 +12,15 @@ module Liquid
      @blocks = []

      if markup =~ Syntax
-        @left = Expression.parse($1)
+        @left = Expression.parse(Regexp.last_match(1))
      else
-        raise SyntaxError.new(options[:locale].t("errors.syntax.case".freeze))
+        raise SyntaxError, options[:locale].t("errors.syntax.case")
      end
    end

    def parse(tokens)
      body = BlockBody.new
-      while parse_body(body, tokens)
-        body = @blocks.last.attachment
-      end
+      body = @blocks.last.attachment while parse_body(body, tokens)
    end

    def nodelist
@@ -29,9 +29,9 @@ module Liquid

    def unknown_tag(tag, markup, tokens)
      case tag
-      when 'when'.freeze
+      when 'when'
        record_when_condition(markup)
-      when 'else'.freeze
+      when 'else'
        record_else_condition(markup)
      else
        super
@@ -39,16 +39,14 @@ module Liquid
    end

    def render_to_output_buffer(context, output)
-      context.stack do
-        execute_else_block = true
+      execute_else_block = true

-        @blocks.each do |block|
-          if block.else?
-            block.attachment.render_to_output_buffer(context, output) if execute_else_block
-          elsif block.evaluate(context)
-            execute_else_block = false
-            block.attachment.render_to_output_buffer(context, output)
-          end
+      @blocks.each do |block|
+        if block.else?
+          block.attachment.render_to_output_buffer(context, output) if execute_else_block
+        elsif block.evaluate(context)
+          execute_else_block = false
+          block.attachment.render_to_output_buffer(context, output)
        end
      end

@@ -62,12 +60,12 @@ module Liquid

      while markup
        unless markup =~ WhenSyntax
-          raise SyntaxError.new(options[:locale].t("errors.syntax.case_invalid_when".freeze))
+          raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_when")
        end

-        markup = $2
+        markup = Regexp.last_match(2)

-        block = Condition.new(@left, '=='.freeze, Expression.parse($1))
+        block = Condition.new(@left, '==', Expression.parse(Regexp.last_match(1)))
        block.attach(body)
        @blocks << block
      end
@@ -75,7 +73,7 @@ module Liquid

    def record_else_condition(markup)
      unless markup.strip.empty?
-        raise SyntaxError.new(options[:locale].t("errors.syntax.case_invalid_else".freeze))
+        raise SyntaxError, options[:locale].t("errors.syntax.case_invalid_else")
      end

      block = ElseCondition.new
@@ -90,5 +88,5 @@ module Liquid
    end
  end

-  Template.register_tag('case'.freeze, Case)
+  Template.register_tag('case', Case)
 end
--- a/lib/liquid/tags/comment.rb
+++ b/lib/liquid/tags/comment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class Comment < Block
    def render_to_output_buffer(_context, output)
@@ -12,5 +14,5 @@ module Liquid
    end
  end

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

-  Template.register_tag('continue'.freeze, Continue)
+  Template.register_tag('continue', Continue)
 end
--- a/lib/liquid/tags/cycle.rb
+++ b/lib/liquid/tags/cycle.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Cycle is usually used within a loop to alternate between values, like colors or DOM classes.
  #
@@ -21,38 +23,36 @@ module Liquid
      super
      case markup
      when NamedSyntax
-        @variables = variables_from_string($2)
-        @name = Expression.parse($1)
+        @variables = variables_from_string(Regexp.last_match(2))
+        @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.new(options[:locale].t("errors.syntax.cycle".freeze))
+        raise SyntaxError, options[:locale].t("errors.syntax.cycle")
      end
    end

    def render_to_output_buffer(context, output)
      context.registers[:cycle] ||= {}

-      context.stack do
-        key = context.evaluate(@name)
-        iteration = context.registers[:cycle][key].to_i
+      key       = context.evaluate(@name)
+      iteration = context.registers[:cycle][key].to_i

-        val = context.evaluate(@variables[iteration])
+      val = context.evaluate(@variables[iteration])

-        if val.is_a?(Array)
-          val = val.join
-        elsif !val.is_a?(String)
-          val = val.to_s
-        end
-
-        output << val
-
-        iteration += 1
-        iteration  = 0 if iteration >= @variables.size
-        context.registers[:cycle][key] = iteration
+      if val.is_a?(Array)
+        val = val.join
+      elsif !val.is_a?(String)
+        val = val.to_s
      end

+      output << val
+
+      iteration += 1
+      iteration = 0 if iteration >= @variables.size
+
+      context.registers[:cycle][key] = iteration
      output
    end

@@ -61,7 +61,7 @@ module Liquid
    def variables_from_string(markup)
      markup.split(',').collect do |var|
        var =~ /\s*(#{QuotedFragment})\s*/o
-        $1 ? Expression.parse($1) : nil
+        Regexp.last_match(1) ? Expression.parse(Regexp.last_match(1)) : nil
      end.compact
    end

--- a/lib/liquid/tags/decrement.rb
+++ b/lib/liquid/tags/decrement.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # decrement is used in a place where one needs to insert a counter
  #     into a template, and needs the counter to survive across
@@ -32,5 +34,5 @@ module Liquid
    end
  end

-  Template.register_tag('decrement'.freeze, Decrement)
+  Template.register_tag('decrement', Decrement)
 end
--- a/lib/liquid/tags/echo.rb
+++ b/lib/liquid/tags/echo.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Echo outputs an expression
  #
@@ -16,9 +18,9 @@ module Liquid
    end

    def render(context)
-      @variable.render_to_output_buffer(context, '')
+      @variable.render_to_output_buffer(context, +'')
    end
  end

-  Template.register_tag('echo'.freeze, Echo)
+  Template.register_tag('echo', Echo)
 end
--- a/lib/liquid/tags/for.rb
+++ b/lib/liquid/tags/for.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # "For" iterates over an array or collection.
  # Several useful variables are available to you within the loop.
@@ -66,7 +68,7 @@ module Liquid
    end

    def unknown_tag(tag, markup, tokens)
-      return super unless tag == 'else'.freeze
+      return super unless tag == 'else'
      @else_block = BlockBody.new
    end

@@ -86,31 +88,33 @@ module Liquid

    def lax_parse(markup)
      if markup =~ Syntax
-        @variable_name = $1
-        collection_name = $2
-        @reversed = !!$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.new(options[:locale].t("errors.syntax.for".freeze))
+        raise SyntaxError, options[:locale].t("errors.syntax.for")
      end
    end

    def strict_parse(markup)
      p = Parser.new(markup)
      @variable_name = p.consume(:id)
-      raise SyntaxError.new(options[:locale].t("errors.syntax.for_invalid_in".freeze)) unless p.id?('in'.freeze)
-      collection_name = p.expression
-      @name = "#{@variable_name}-#{collection_name}"
+      raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_in") unless p.id?('in')
+
+      collection_name  = p.expression
      @collection_name = Expression.parse(collection_name)
-      @reversed = p.id?('reversed'.freeze)
+
+      @name     = "#{@variable_name}-#{collection_name}"
+      @reversed = p.id?('reversed')

      while p.look(:id) && p.look(:colon, 1)
-        unless attribute = p.id?('limit'.freeze) || p.id?('offset'.freeze)
-          raise SyntaxError.new(options[:locale].t("errors.syntax.for_invalid_attribute".freeze))
+        unless (attribute = p.id?('limit') || p.id?('offset'))
+          raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_attribute")
        end
        p.consume
        set_attribute(attribute, p.expression)
@@ -154,7 +158,7 @@ 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])
@@ -162,7 +166,7 @@ module Liquid
        for_stack.push(loop_vars)

        begin
-          context['forloop'.freeze] = loop_vars
+          context['forloop'] = loop_vars

          segment.each do |item|
            context[@variable_name] = item
@@ -170,11 +174,10 @@ module Liquid
            loop_vars.send(:increment!)

            # Handle any interrupts if they exist.
-            if context.interrupt?
-              interrupt = context.pop_interrupt
-              break if interrupt.is_a? BreakInterrupt
-              next if interrupt.is_a? ContinueInterrupt
-            end
+            next unless context.interrupt?
+            interrupt = context.pop_interrupt
+            break if interrupt.is_a?(BreakInterrupt)
+            next if interrupt.is_a?(ContinueInterrupt)
          end
        ensure
          for_stack.pop
@@ -186,13 +189,13 @@ module Liquid

    def set_attribute(key, expr)
      case key
-      when 'offset'.freeze
-        @from = if expr == 'continue'.freeze
+      when 'offset'
+        @from = if expr == 'continue'
          :continue
        else
          Expression.parse(expr)
        end
-      when 'limit'.freeze
+      when 'limit'
        @limit = Expression.parse(expr)
      end
    end
@@ -212,5 +215,5 @@ module Liquid
    end
  end

-  Template.register_tag('for'.freeze, For)
+  Template.register_tag('for', For)
 end
--- a/lib/liquid/tags/if.rb
+++ b/lib/liquid/tags/if.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # If is the conditional block
  #
@@ -10,16 +12,16 @@ 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'.freeze, markup)
+      push_block('if', markup)
    end

    def nodelist
@@ -32,7 +34,7 @@ module Liquid
    end

    def unknown_tag(tag, markup, tokens)
-      if ['elsif'.freeze, 'else'.freeze].include?(tag)
+      if ['elsif', 'else'].include?(tag)
        push_block(tag, markup)
      else
        super
@@ -40,11 +42,9 @@ module Liquid
    end

    def render_to_output_buffer(context, output)
-      context.stack do
-        @blocks.each do |block|
-          if block.evaluate(context)
-            return block.attachment.render_to_output_buffer(context, output)
-          end
+      @blocks.each do |block|
+        if block.evaluate(context)
+          return block.attachment.render_to_output_buffer(context, output)
        end
      end

@@ -54,7 +54,7 @@ module Liquid
    private

    def push_block(tag, markup)
-      block = if tag == 'else'.freeze
+      block = if tag == 'else'
        ElseCondition.new
      else
        parse_with_selected_parser(markup)
@@ -66,17 +66,17 @@ module Liquid

    def lax_parse(markup)
      expressions = markup.scan(ExpressionsAndOperators)
-      raise(SyntaxError.new(options[:locale].t("errors.syntax.if".freeze))) unless expressions.pop =~ Syntax
+      raise SyntaxError, options[:locale].t("errors.syntax.if") unless expressions.pop =~ Syntax

-      condition = Condition.new(Expression.parse($1), $2, Expression.parse($3))
+      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.new(options[:locale].t("errors.syntax.if".freeze))) unless expressions.pop.to_s =~ Syntax
+        raise SyntaxError, options[:locale].t("errors.syntax.if") unless expressions.pop.to_s =~ Syntax

-        new_condition = Condition.new(Expression.parse($1), $2, Expression.parse($3))
-        raise(SyntaxError.new(options[:locale].t("errors.syntax.if".freeze))) unless BOOLEAN_OPERATORS.include?(operator)
+        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)
        new_condition.send(operator, condition)
        condition = new_condition
      end
@@ -94,7 +94,7 @@ module Liquid
    def parse_binary_comparisons(p)
      condition = parse_comparison(p)
      first_condition = condition
-      while op = (p.id?('and'.freeze) || p.id?('or'.freeze))
+      while (op = (p.id?('and') || p.id?('or')))
        child_condition = parse_comparison(p)
        condition.send(op, child_condition)
        condition = child_condition
@@ -104,7 +104,7 @@ 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 +119,5 @@ module Liquid
    end
  end

-  Template.register_tag('if'.freeze, If)
+  Template.register_tag('if', If)
 end
--- a/lib/liquid/tags/ifchanged.rb
+++ b/lib/liquid/tags/ifchanged.rb
@@ -1,19 +1,19 @@
+# frozen_string_literal: true
+
 module Liquid
  class Ifchanged < Block
    def render_to_output_buffer(context, output)
-      context.stack do
-        block_output = ''
-        super(context, block_output)
+      block_output = +''
+      super(context, block_output)

-        if block_output != context.registers[:ifchanged]
-          context.registers[:ifchanged] = block_output
-          output << block_output
-        end
+      if block_output != context.registers[:ifchanged]
+        context.registers[:ifchanged] = block_output
+        output << block_output
      end

      output
    end
  end

-  Template.register_tag('ifchanged'.freeze, Ifchanged)
+  Template.register_tag('ifchanged', Ifchanged)
 end
--- a/lib/liquid/tags/include.rb
+++ b/lib/liquid/tags/include.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Include allows templates to relate with other templates
  #
@@ -14,28 +16,30 @@ module Liquid
  #   {% include 'product' for products %}
  #
  class Include < Tag
-    Syntax = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?/o
+    SYNTAX = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o
+    Syntax = SYNTAX

    attr_reader :template_name_expr, :variable_name_expr, :attributes

    def initialize(tag_name, markup, options)
      super

-      if markup =~ Syntax
+      if markup =~ SYNTAX

-        template_name = $1
-        variable_name = $3
+        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.new(options[:locale].t("errors.syntax.include".freeze))
+        raise SyntaxError, options[:locale].t("errors.syntax.include")
      end
    end

@@ -44,7 +48,7 @@ module Liquid

    def render_to_output_buffer(context, output)
      template_name = context.evaluate(@template_name_expr)
-      raise ArgumentError.new(options[:locale].t("errors.argument.include")) unless template_name
+      raise ArgumentError, options[:locale].t("errors.argument.include") unless template_name

      partial = PartialCache.load(
        template_name,
@@ -52,7 +56,7 @@ module Liquid
        parse_context: parse_context
      )

-      context_variable_name = template_name.split('/'.freeze).last
+      context_variable_name = @alias_name || template_name.split('/').last

      variable = if @variable_name_expr
        context.evaluate(@variable_name_expr)
@@ -61,10 +65,10 @@ 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)
@@ -82,7 +86,7 @@ module Liquid
        end
      ensure
        context.template_name = old_template_name
-        context.partial = old_partial
+        context.partial       = old_partial
      end

      output
@@ -95,11 +99,11 @@ module Liquid
      def children
        [
          @node.template_name_expr,
-          @node.variable_name_expr
+          @node.variable_name_expr,
        ] + @node.attributes.values
      end
    end
  end

-  Template.register_tag('include'.freeze, Include)
+  Template.register_tag('include', Include)
 end
--- a/lib/liquid/tags/increment.rb
+++ b/lib/liquid/tags/increment.rb
@@ -1,3 +1,5 @@
+# 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
@@ -29,5 +31,5 @@ module Liquid
    end
  end

-  Template.register_tag('increment'.freeze, Increment)
+  Template.register_tag('increment', Increment)
 end
--- a/lib/liquid/tags/raw.rb
+++ b/lib/liquid/tags/raw.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class Raw < Block
    Syntax = /\A\s*\z/
@@ -10,16 +12,16 @@ module Liquid
    end

    def parse(tokens)
-      @body = ''
-      while token = tokens.shift
+      @body = +''
+      while (token = tokens.shift)
        if token =~ FullTokenPossiblyInvalid
-          @body << $1 if $1 != "".freeze
-          return if block_delimiter == $2
+          @body << Regexp.last_match(1) if Regexp.last_match(1) != ""
+          return if block_delimiter == Regexp.last_match(2)
        end
        @body << token unless token.empty?
      end

-      raise SyntaxError.new(parse_context.locale.t("errors.syntax.tag_never_closed".freeze, block_name: block_name))
+      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
    end

    def render_to_output_buffer(_context, output)
@@ -38,11 +40,11 @@ module Liquid
    protected

    def ensure_valid_markup(tag_name, markup, parse_context)
-      unless markup =~ Syntax
-        raise SyntaxError.new(parse_context.locale.t("errors.syntax.tag_unexpected_args".freeze, tag: tag_name))
+      unless Syntax.match?(markup)
+        raise SyntaxError, parse_context.locale.t("errors.syntax.tag_unexpected_args", tag: tag_name)
      end
    end
  end

-  Template.register_tag('raw'.freeze, Raw)
+  Template.register_tag('raw', Raw)
 end
--- a/lib/liquid/tags/render.rb
+++ b/lib/liquid/tags/render.rb
@@ -1,17 +1,27 @@
+# frozen_string_literal: true
+
 module Liquid
  class Render < Tag
-    Syntax = /(#{QuotedString})#{QuotedFragment}*/o
+    FOR = 'for'
+    SYNTAX = /(#{QuotedString}+)(\s+(with|#{FOR})\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o
+
+    disable_tags "include"

    attr_reader :template_name_expr, :attributes

    def initialize(tag_name, markup, options)
      super

-      raise SyntaxError.new(options[:locale].t("errors.syntax.render".freeze)) unless markup =~ Syntax
+      raise SyntaxError, options[:locale].t("errors.syntax.render") unless markup =~ SYNTAX

-      template_name = $1
+      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|
@@ -20,9 +30,13 @@ 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.new(options[:locale].t("errors.argument.include")) unless template_name
+      raise ArgumentError, options[:locale].t("errors.argument.include") unless template_name

      partial = PartialCache.load(
        template_name,
@@ -30,13 +44,29 @@ module Liquid
        parse_context: parse_context
      )

-      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)
+      context_variable_name = @alias_name || template_name.split('/').last
+
+      render_partial_func = ->(var, forloop) {
+        inner_context               = context.new_isolated_subcontext
+        inner_context.template_name = template_name
+        inner_context.partial       = true
+        inner_context['forloop']    = forloop if forloop
+
+        @attributes.each do |key, value|
+          inner_context[key] = context.evaluate(value)
+        end
+        inner_context[context_variable_name] = var unless var.nil?
+        partial.render_to_output_buffer(inner_context, output)
+        forloop&.send(:increment!)
+      }
+
+      variable = @variable_name_expr ? context.evaluate(@variable_name_expr) : nil
+      if @for && variable.respond_to?(:each) && variable.respond_to?(:count)
+        forloop = Liquid::ForloopDrop.new(template_name, variable.count, nil)
+        variable.each { |var| render_partial_func.call(var, forloop) }
+      else
+        render_partial_func.call(variable, nil)
      end
-      partial.render_to_output_buffer(inner_context, output)

      output
    end
@@ -50,5 +80,5 @@ module Liquid
    end
  end

-  Template.register_tag('render'.freeze, Render)
+  Template.register_tag('render', Render)
 end
--- a/lib/liquid/tags/table_row.rb
+++ b/lib/liquid/tags/table_row.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  class TableRow < Block
    Syntax = /(\w+)\s+in\s+(#{QuotedFragment}+)/o
@@ -7,33 +9,32 @@ module Liquid
    def initialize(tag_name, markup, options)
      super
      if markup =~ Syntax
-        @variable_name = $1
-        @collection_name = Expression.parse($2)
-        @attributes = {}
+        @variable_name   = Regexp.last_match(1)
+        @collection_name = Expression.parse(Regexp.last_match(2))
+        @attributes      = {}
        markup.scan(TagAttributes) do |key, value|
          @attributes[key] = Expression.parse(value)
        end
      else
-        raise SyntaxError.new(options[:locale].t("errors.syntax.table_row".freeze))
+        raise SyntaxError, options[:locale].t("errors.syntax.table_row")
      end
    end

    def render_to_output_buffer(context, output)
-      collection = context.evaluate(@collection_name) or return ''.freeze
+      (collection = context.evaluate(@collection_name)) || (return '')

-      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
+      from = @attributes.key?('offset') ? context.evaluate(@attributes['offset']).to_i : 0
+      to   = @attributes.key?('limit')  ? from + context.evaluate(@attributes['limit']).to_i : nil

      collection = Utils.slice_collection(collection, from, to)
+      length     = collection.length

-      length = collection.length
-
-      cols = context.evaluate(@attributes['cols'.freeze]).to_i
+      cols = context.evaluate(@attributes['cols']).to_i

      output << "<tr class=\"row1\">\n"
      context.stack do
        tablerowloop = Liquid::TablerowloopDrop.new(length, cols)
-        context['tablerowloop'.freeze] = tablerowloop
+        context['tablerowloop'] = tablerowloop

        collection.each do |item|
          context[@variable_name] = item
@@ -61,5 +62,5 @@ module Liquid
    end
  end

-  Template.register_tag('tablerow'.freeze, TableRow)
+  Template.register_tag('tablerow', TableRow)
 end
--- a/lib/liquid/tags/unless.rb
+++ b/lib/liquid/tags/unless.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'if'

 module Liquid
@@ -7,18 +9,16 @@ module Liquid
  #
  class Unless < If
    def render_to_output_buffer(context, output)
-      context.stack do
-        # First condition is interpreted backwards ( if not )
-        first_block = @blocks.first
-        unless first_block.evaluate(context)
-          return first_block.attachment.render_to_output_buffer(context, output)
-        end
+      # First condition is interpreted backwards ( if not )
+      first_block = @blocks.first
+      unless first_block.evaluate(context)
+        return first_block.attachment.render_to_output_buffer(context, output)
+      end

-        # After the first condition unless works just like if
-        @blocks[1..-1].each do |block|
-          if block.evaluate(context)
-            return block.attachment.render_to_output_buffer(context, output)
-          end
+      # After the first condition unless works just like if
+      @blocks[1..-1].each do |block|
+        if block.evaluate(context)
+          return block.attachment.render_to_output_buffer(context, output)
        end
      end

@@ -26,5 +26,5 @@ module Liquid
    end
  end

-  Template.register_tag('unless'.freeze, Unless)
+  Template.register_tag('unless', Unless)
 end
--- a/lib/liquid/template.rb
+++ b/lib/liquid/template.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Templates are central to liquid.
  # Interpretating templates is a two step process. First you compile the
@@ -16,13 +18,11 @@ module Liquid
    attr_accessor :root
    attr_reader :resource_limits, :warnings

-    @@file_system = BlankFileSystem.new
-
    class TagRegistry
      include Enumerable

      def initialize
-        @tags = {}
+        @tags  = {}
        @cache = {}
      end

@@ -61,76 +61,82 @@ module Liquid
      # :lax acts like liquid 2.5 and silently ignores malformed tags in most cases.
      # :warn is the default and will give deprecation warnings when invalid syntax is used.
      # :strict will enforce correct syntax.
-      attr_writer :error_mode
+      attr_accessor :error_mode
+      Template.error_mode = :lax
+
+      attr_reader :taint_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
+      # @deprecated Since it is being deprecated in ruby itself.
+      def taint_mode=(mode)
+        taint_supported = Object.new.taint.tainted?
+        if mode != :lax && !taint_supported
+          raise NotImplementedError, "#{RUBY_ENGINE} #{RUBY_VERSION} doesn't support taint checking"
+        end
+        @taint_mode = mode
+      end
+
+      Template.taint_mode = :lax

      attr_accessor :default_exception_renderer
      Template.default_exception_renderer = lambda do |exception|
        exception
      end

-      def file_system
-        @@file_system
-      end
+      attr_accessor :file_system
+      Template.file_system = BlankFileSystem.new

-      def file_system=(obj)
-        @@file_system = obj
-      end
+      attr_accessor :tags
+      Template.tags = TagRegistry.new
+      private :tags=

      def register_tag(name, klass)
        tags[name.to_s] = klass
      end

-      def tags
-        @tags ||= TagRegistry.new
-      end
+      attr_accessor :registers
+      Template.registers = {}
+      private :registers=

-      def error_mode
-        @error_mode ||= :lax
-      end
-
-      def taint_mode
-        @taint_mode ||= :lax
+      def add_register(name, klass)
+        registers[name.to_sym] = klass
      end

      # Pass a module with filter methods which should be available
      # to all liquid views. Good for registering the standard library
      def register_filter(mod)
-        Strainer.global_filter(mod)
+        StrainerFactory.add_global_filter(mod)
      end

-      def default_resource_limits
-        @default_resource_limits ||= {}
-      end
+      attr_accessor :default_resource_limits
+      Template.default_resource_limits = {}
+      private :default_resource_limits=

      # creates a new <tt>Template</tt> object from liquid source code
      # To enable profiling, pass in <tt>profile: true</tt> as an option.
      # See Liquid::Profiler for more information
      def parse(source, options = {})
-        template = Template.new
-        template.parse(source, options)
+        new.parse(source, options)
      end
    end

    def initialize
-      @rethrow_errors = false
-      @resource_limits = ResourceLimits.new(self.class.default_resource_limits)
+      @rethrow_errors  = false
+      @resource_limits = ResourceLimits.new(Template.default_resource_limits)
    end

    # Parse source code.
    # Returns self for easy chaining
    def parse(source, options = {})
-      @options = options
-      @profiling = options[:profile]
+      @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

@@ -165,19 +171,19 @@ module Liquid
    #    filters and tags and might be useful to integrate liquid more with its host application
    #
    def render(*args)
-      return ''.freeze if @root.nil?
+      return '' if @root.nil?

      context = case args.first
      when Liquid::Context
        c = args.shift

        if @rethrow_errors
-          c.exception_renderer = ->(e) { raise }
+          c.exception_renderer = ->(_e) { raise }
        end

        c
      when Liquid::Drop
-        drop = args.shift
+        drop         = args.shift
        drop.context = Context.new([drop, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
      when Hash
        Context.new([args.shift, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
@@ -189,18 +195,26 @@ module Liquid

      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]

-        registers.merge!(options[:registers]) if options[:registers].is_a?(Hash)
+        options[:registers]&.each do |key, register|
+          context_register[key] = register
+        end

        apply_options_to_context(context, options)
      when Module, Array
        context.add_filters(args.pop)
      end

+      Template.registers.each do |key, register|
+        context_register[key] = register unless context_register.key?(key)
+      end
+
      # Retrying a render resets resource usage
      context.resource_limits.reset

@@ -208,7 +222,7 @@ 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)
@@ -236,7 +250,7 @@ module Liquid
      if @profiling && !context.partial
        raise "Profiler not loaded, require 'liquid/profiler' first" unless defined?(Liquid::Profiler)

-        @profiler = Profiler.new
+        @profiler = Profiler.new(context.template_name)
        @profiler.start

        begin
@@ -251,10 +265,10 @@ 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
--- a/lib/liquid/template_factory.rb
+++ b/lib/liquid/template_factory.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module Liquid
+  class TemplateFactory
+    def for(_template_name)
+      Liquid::Template.new
+    end
+  end
+end
--- a/lib/liquid/tokenizer.rb
+++ b/lib/liquid/tokenizer.rb
@@ -1,16 +1,18 @@
+# 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
-      token = @tokens.shift or return
+      (token = @tokens.shift) || return

      if @line_number
        @line_number += @for_liquid_tag ? 1 : token.count("\n")
@@ -29,7 +31,7 @@ module Liquid
      tokens = @source.split(TemplateParser)

      # removes the rogue empty element at the beginning of the array
-      tokens.shift if tokens[0] && tokens[0].empty?
+      tokens.shift if tokens[0]&.empty?

      tokens
    end
--- a/lib/liquid/usage.rb
+++ b/lib/liquid/usage.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+module Liquid
+  module Usage
+    def self.increment(name)
+    end
+  end
+end
--- a/lib/liquid/utils.rb
+++ b/lib/liquid/utils.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  module Utils
    def self.slice_collection(collection, from, to)
@@ -10,7 +12,7 @@ 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)
@@ -50,7 +52,7 @@ module Liquid
      when Numeric
        obj
      when String
-        (obj.strip =~ /\A-?\d+\.\d+\z/) ? BigDecimal(obj) : obj.to_i
+        /\A-?\d+\.\d+\z/.match?(obj.strip) ? BigDecimal(obj) : obj.to_i
      else
        if obj.respond_to?(:to_number)
          obj.to_number
@@ -69,7 +71,7 @@ module Liquid
      end

      case obj
-      when 'now'.freeze, 'today'.freeze
+      when 'now', 'today'
        Time.now
      when /\A\d+\z/, Integer
        Time.at(obj.to_i)
--- a/lib/liquid/variable.rb
+++ b/lib/liquid/variable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Liquid
  # Holds variables. Variables are only loaded "just in time"
  # and are not evaluated as part of the render stage
@@ -10,10 +12,10 @@ 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
@@ -23,10 +25,10 @@ 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
@@ -43,11 +45,11 @@ module Liquid
      @filters = []
      return unless markup =~ MarkupWithQuotedFragment

-      name_markup = $1
-      filter_markup = $2
-      @name = Expression.parse(name_markup)
+      name_markup   = Regexp.last_match(1)
+      filter_markup = Regexp.last_match(2)
+      @name         = Expression.parse(name_markup)
      if filter_markup =~ FilterMarkupRegex
-        filters = $1.scan(FilterParser)
+        filters = Regexp.last_match(1).scan(FilterParser)
        filters.each do |f|
          next unless f =~ /\w+/
          filtername = Regexp.last_match(0)
@@ -102,14 +104,22 @@ 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)
@@ -121,7 +131,7 @@ module Liquid
    end

    def evaluate_filter_expressions(context, filter_args, filter_kwargs)
-      parsed_args = filter_args.map{ |expr| context.evaluate(expr) }
+      parsed_args = filter_args.map { |expr| context.evaluate(expr) }
      if filter_kwargs
        parsed_kwargs = {}
        filter_kwargs.each do |key, expr|
@@ -133,14 +143,14 @@ module Liquid
    end

    def taint_check(context, obj)
-      return unless obj.tainted?
      return if Template.taint_mode == :lax
+      return unless obj.tainted?

      @markup =~ QuotedFragment
      name = Regexp.last_match(0)

-      error = TaintedError.new("variable '#{name}' is tainted and was not escaped")
-      error.line_number = line_number
+      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
--- a/lib/liquid/variable_lookup.rb
+++ b/lib/liquid/variable_lookup.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 module Liquid
  class VariableLookup
    SQUARE_BRACKETED = /\A\[(.*)\]\z/m
-    COMMAND_METHODS = ['size'.freeze, 'first'.freeze, 'last'.freeze].freeze
+    COMMAND_METHODS  = ['size', 'first', 'last'].freeze

    attr_reader :name, :lookups

@@ -14,17 +16,17 @@ module Liquid

      name = lookups.shift
      if name =~ SQUARE_BRACKETED
-        name = Expression.parse($1)
+        name = Expression.parse(Regexp.last_match(1))
      end
      @name = name

-      @lookups = lookups
+      @lookups       = lookups
      @command_flags = 0

      @lookups.each_index do |i|
        lookup = lookups[i]
        if lookup =~ SQUARE_BRACKETED
-          lookups[i] = Expression.parse($1)
+          lookups[i] = Expression.parse(Regexp.last_match(1))
        elsif COMMAND_METHODS.include?(lookup)
          @command_flags |= 1 << i
        end
@@ -32,7 +34,7 @@ module Liquid
    end

    def evaluate(context)
-      name = context.evaluate(@name)
+      name   = context.evaluate(@name)
      object = context.find_variable(name)

      @lookups.each_index do |i|
@@ -45,7 +47,7 @@ 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
--- a/lib/liquid/version.rb
+++ b/lib/liquid/version.rb
@@ -1,5 +1,6 @@
 # encoding: utf-8
+# frozen_string_literal: true

 module Liquid
-  VERSION = "4.0.3".freeze
+  VERSION = "4.0.3"
 end
--- a/liquid.gemspec
+++ b/liquid.gemspec
@@ -1,7 +1,8 @@
 # encoding: utf-8
+# frozen_string_literal: true

 lib = File.expand_path('../lib/', __FILE__)
-$LOAD_PATH.unshift lib unless $LOAD_PATH.include?(lib)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)

 require "liquid/version"

@@ -26,6 +27,6 @@ Gem::Specification.new do |s|

  s.require_path = "lib"

-  s.add_development_dependency 'rake', '~> 11.3'
-  s.add_development_dependency 'minitest'
+  s.add_development_dependency('rake', '~> 11.3')
+  s.add_development_dependency('minitest')
 end
--- a/performance/benchmark.rb
+++ b/performance/benchmark.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'benchmark/ips'
 require_relative 'theme_runner'

@@ -5,7 +7,7 @@ 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
--- a/performance/memory_profile.rb
+++ b/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
--- a/performance/profile.rb
+++ b/performance/profile.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'stackprof'
 require_relative 'theme_runner'

@@ -13,7 +15,7 @@ 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
--- a/performance/shopify/comment_form.rb
+++ b/performance/shopify/comment_form.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CommentForm < Liquid::Block
  Syntax = /(#{Liquid::VariableSignature}+)/

@@ -5,10 +7,10 @@ class CommentForm < Liquid::Block
    super

    if markup =~ Syntax
-      @variable_name = $1
-      @attributes = {}
+      @variable_name = Regexp.last_match(1)
+      @attributes    = {}
    else
-      raise SyntaxError.new("Syntax Error in 'comment_form' - Valid syntax: comment_form [article]")
+      raise SyntaxError, "Syntax Error in 'comment_form' - Valid syntax: comment_form [article]"
    end
  end

@@ -20,8 +22,8 @@ class CommentForm < Liquid::Block
        'posted_successfully?' => context.registers[:posted_successfully],
        'errors' => context['comment.errors'],
        'author' => context['comment.author'],
-        'email'  => context['comment.email'],
-        'body'   => context['comment.body']
+        'email' => context['comment.email'],
+        'body' => context['comment.body'],
      }

      output << wrap_in_form(article, render_all(@nodelist, context, output))
--- a/performance/shopify/database.rb
+++ b/performance/shopify/database.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'yaml'

 module Database
@@ -16,9 +18,10 @@ module Database
      end

      # key the tables by handles, as this is how liquid expects it.
-      db = db.inject({}) do |assigns, (key, values)|
-        assigns[key] = values.inject({}) { |h, v| h[v['handle']] = v; h; }
-        assigns
+      db = db.each_with_object({}) do |(key, values), assigns|
+        assigns[key] = values.each_with_object({}) do |v, h|
+          h[v['handle']] = v
+        end
      end

      # Some standard direct accessors so that the specialized templates
@@ -29,9 +32,9 @@ module Database
      db['article']    = db['blog']['articles'].first

      db['cart']       = {
-        'total_price' => db['line_items'].values.inject(0) { |sum, item| sum += item['line_price'] * item['quantity'] },
-        'item_count'  => db['line_items'].values.inject(0) { |sum, item| sum += item['quantity'] },
-        'items'       => db['line_items'].values
+        '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,
      }

      db
@@ -40,6 +43,6 @@ module Database
 end

 if __FILE__ == $PROGRAM_NAME
-  p Database.tables['collections']['frontpage'].keys
+  p(Database.tables['collections']['frontpage'].keys)
  # p Database.tables['blog']['articles']
 end
--- a/performance/shopify/json_filter.rb
+++ b/performance/shopify/json_filter.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 require 'json'

 module JsonFilter
  def json(object)
-    JSON.dump(object.reject { |k, v| k == "collections" })
+    JSON.dump(object.reject { |k, _v| k == "collections" })
  end
 end
--- a/performance/shopify/liquid.rb
+++ b/performance/shopify/liquid.rb
@@ -1,4 +1,6 @@
-$:.unshift __dir__ + '/../../lib'
+# frozen_string_literal: true
+
+$LOAD_PATH.unshift(__dir__ + '/../../lib')
 require_relative '../../lib/liquid'

 require_relative 'comment_form'
@@ -9,11 +11,11 @@ require_relative 'shop_filter'
 require_relative 'tag_filter'
 require_relative 'weight_filter'

-Liquid::Template.register_tag 'paginate', Paginate
-Liquid::Template.register_tag 'form', CommentForm
+Liquid::Template.register_tag('paginate', Paginate)
+Liquid::Template.register_tag('form', CommentForm)

-Liquid::Template.register_filter JsonFilter
-Liquid::Template.register_filter MoneyFilter
-Liquid::Template.register_filter WeightFilter
-Liquid::Template.register_filter ShopFilter
-Liquid::Template.register_filter TagFilter
+Liquid::Template.register_filter(JsonFilter)
+Liquid::Template.register_filter(MoneyFilter)
+Liquid::Template.register_filter(WeightFilter)
+Liquid::Template.register_filter(ShopFilter)
+Liquid::Template.register_filter(TagFilter)
--- a/performance/shopify/money_filter.rb
+++ b/performance/shopify/money_filter.rb
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 module MoneyFilter
  def money_with_currency(money)
    return '' if money.nil?
-    sprintf("$ %.2f USD", money / 100.0)
+    format("$ %.2f USD", money / 100.0)
  end

  def money(money)
    return '' if money.nil?
-    sprintf("$ %.2f", money / 100.0)
+    format("$ %.2f", money / 100.0)
  end

  private
--- a/performance/shopify/paginate.rb
+++ b/performance/shopify/paginate.rb
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 class Paginate < Liquid::Block
-  Syntax     = /(#{Liquid::QuotedFragment})\s*(by\s*(\d+))?/
+  Syntax = /(#{Liquid::QuotedFragment})\s*(by\s*(\d+))?/

  def initialize(tag_name, markup, options)
    super

    if markup =~ Syntax
-      @collection_name = $1
-      @page_size = if $2
-        $3.to_i
+      @collection_name = Regexp.last_match(1)
+      @page_size       = if Regexp.last_match(2)
+        Regexp.last_match(3).to_i
      else
        20
      end
@@ -17,7 +19,7 @@ class Paginate < Liquid::Block
        @attributes[key] = value
      end
    else
-      raise SyntaxError.new("Syntax Error in tag 'paginate' - Valid syntax: paginate [collection] by number")
+      raise SyntaxError, "Syntax Error in tag 'paginate' - Valid syntax: paginate [collection] by number"
    end
  end

@@ -25,19 +27,19 @@ class Paginate < Liquid::Block
    @context = context

    context.stack do
-      current_page  = context['current_page'].to_i
+      current_page = context['current_page'].to_i

      pagination = {
-        'page_size'      => @page_size,
-        'current_page'   => 5,
-        'current_offset' => @page_size * 5
+        'page_size' => @page_size,
+        'current_page' => 5,
+        'current_offset' => @page_size * 5,
      }

      context['paginate'] = pagination

-      collection_size  = context[@collection_name].size
+      collection_size = context[@collection_name].size

-      raise ArgumentError.new("Cannot paginate array '#{@collection_name}'. Not found.") if collection_size.nil?
+      raise ArgumentError, "Cannot paginate array '#{@collection_name}'. Not found." if collection_size.nil?

      page_count = (collection_size.to_f / @page_size.to_f).to_f.ceil + 1

--- a/performance/shopify/shop_filter.rb
+++ b/performance/shopify/shop_filter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ShopFilter
  def asset_url(input)
    "/files/1/[shop_id]/[shop_id]/assets/#{input}"
@@ -29,7 +31,7 @@ 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
@@ -37,7 +39,7 @@ 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
@@ -52,15 +54,15 @@ module ShopFilter
  end

  def product_img_url(url, style = 'small')
-    unless url =~ /\Aproducts\/([\w\-\_]+)\.(\w{2,4})/
+    unless url =~ %r{\Aproducts/([\w\-\_]+)\.(\w{2,4})}
      raise ArgumentError, 'filter "size" can only be called on product images'
    end

    case style
    when 'original'
-      return '/files/shops/random_number/' + url
+      '/files/shops/random_number/' + url
    when 'grande', 'large', 'medium', 'compact', 'small', 'thumb', 'icon'
-      "/files/shops/random_number/products/#{$1}_#{style}.#{$2}"
+      "/files/shops/random_number/products/#{Regexp.last_match(1)}_#{style}.#{Regexp.last_match(2)}"
    else
      raise ArgumentError, 'valid parameters for filter "size" are: original, grande, large, medium, compact, small, thumb and icon '
    end
@@ -70,16 +72,14 @@ module ShopFilter
    html = []
    html << %(<span class="prev">#{link_to(paginate['previous']['title'], paginate['previous']['url'])}</span>) if paginate['previous']

-    for part in paginate['parts']
-
-      if part['is_link']
-        html << %(<span class="page">#{link_to(part['title'], part['url'])}</span>)
+    paginate['parts'].each do |part|
+      html << if part['is_link']
+        %(<span class="page">#{link_to(part['title'], part['url'])}</span>)
      elsif part['title'].to_i == paginate['current_page'].to_i
-        html << %(<span class="page current">#{part['title']}</span>)
+        %(<span class="page current">#{part['title']}</span>)
      else
-        html << %(<span class="deco">#{part['title']}</span>)
+        %(<span class="deco">#{part['title']}</span>)
      end
-
    end

    html << %(<span class="next">#{link_to(paginate['next']['title'], paginate['next']['url'])}</span>) if paginate['next']
--- a/performance/shopify/tag_filter.rb
+++ b/performance/shopify/tag_filter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module TagFilter
  def link_to_tag(label, tag)
    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tag}\">#{label}</a>"
@@ -13,11 +15,11 @@ module TagFilter

  def link_to_add_tag(label, tag)
    tags = (@context['current_tags'] + [tag]).uniq
-    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tags.join("+")}\">#{label}</a>"
+    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tags.join('+')}\">#{label}</a>"
  end

  def link_to_remove_tag(label, tag)
    tags = (@context['current_tags'] - [tag]).uniq
-    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tags.join("+")}\">#{label}</a>"
+    "<a title=\"Show tag #{tag}\" href=\"/collections/#{@context['handle']}/#{tags.join('+')}\">#{label}</a>"
  end
 end
--- a/performance/shopify/weight_filter.rb
+++ b/performance/shopify/weight_filter.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 module WeightFilter
  def weight(grams)
-    sprintf("%.2f", grams / 1000)
+    format("%.2f", grams / 1000)
  end

  def weight_with_unit(grams)
--- a/performance/theme_runner.rb
+++ b/performance/theme_runner.rb
@@ -1,3 +1,5 @@
+# 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.
@@ -31,7 +33,7 @@ class ThemeRunner
      {
        liquid: File.read(test),
        layout: (File.file?(theme_path) ? File.read(theme_path) : nil),
-        template_name: test
+        template_name: test,
      }
    end.compact

@@ -56,9 +58,9 @@ 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)
@@ -72,7 +74,7 @@ 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
@@ -86,7 +88,7 @@ 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
@@ -111,9 +113,9 @@ 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
--- a/test/integration/assign_test.rb
+++ b/test/integration/assign_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class AssignTest < Minitest::Test
@@ -8,9 +10,9 @@ 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
--- a/test/integration/blank_test.rb
+++ b/test/integration/blank_test.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class FoobarTag < Liquid::Tag
-  def render_to_output_buffer(context, output)
+  def render_to_output_buffer(_context, output)
    output << ' '
    output
  end
@@ -94,9 +96,9 @@ 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
--- a/test/integration/block_test.rb
+++ b/test/integration/block_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class BlockTest < Minitest::Test
@@ -7,6 +9,6 @@ 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
--- a/test/integration/capture_test.rb
+++ b/test/integration/capture_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class CaptureTest < Minitest::Test
@@ -12,9 +14,9 @@ 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
@@ -28,9 +30,9 @@ 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
@@ -43,8 +45,8 @@ 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
--- a/test/integration/context_test.rb
+++ b/test/integration/context_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class ContextTest < Minitest::Test
--- a/test/integration/document_test.rb
+++ b/test/integration/document_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class DocumentTest < Minitest::Test
@@ -7,13 +9,13 @@ 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
--- a/test/integration/drop_test.rb
+++ b/test/integration/drop_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class ContextDrop < Liquid::Drop
@@ -31,7 +33,7 @@ class ProductDrop < Liquid::Drop

  class CatchallDrop < Liquid::Drop
    def liquid_method_missing(method)
-      'catchall_method: ' << method.to_s
+      "catchall_method: #{method}"
    end
  end

@@ -48,7 +50,7 @@ class ProductDrop < Liquid::Drop
  end

  def user_input
-    "foo".taint
+    (+"foo").taint
  end

  protected
@@ -109,82 +111,89 @@ 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
+  if taint_supported?
+    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
  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
+    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)
  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
@@ -195,40 +204,40 @@ 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
@@ -241,16 +250,16 @@ class DropsTest < Minitest::Test
  end

  def test_some_enumerable_methods_still_get_invoked
-    [ :count, :max ].each do |method|
+    [:count, :max].each do |method|
      assert_equal "3", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => RealEnumerableDrop.new)
      assert_equal "3", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => RealEnumerableDrop.new)
      assert_equal "3", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => EnumerableDrop.new)
      assert_equal "3", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => EnumerableDrop.new)
    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|
+    [:min, :first].each do |method|
      assert_equal "1", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => RealEnumerableDrop.new)
      assert_equal "1", Liquid::Template.parse("{{collection[\"#{method}\"]}}").render!('collection' => RealEnumerableDrop.new)
      assert_equal "1", Liquid::Template.parse("{{collection.#{method}}}").render!('collection' => EnumerableDrop.new)
@@ -259,15 +268,22 @@ 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)
+    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 user_input 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)
  end
 end # DropsTest
--- a/test/integration/error_handling_test.rb
+++ b/test/integration/error_handling_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class ErrorHandlingTest < Minitest::Test
@@ -33,31 +35,31 @@ 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
@@ -76,22 +78,21 @@ 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
    err = assert_raises(SyntaxError) do
-      Liquid::Template.parse(%q(
+      Liquid::Template.parse('
          foobar

          {% "cat" | foobar %}

          bla
-        ),
-        line_numbers: true
-      )
+        ',
+        line_numbers: true)
    end

    assert_match(/Liquid syntax error \(line 4\)/, err.message)
@@ -99,15 +100,14 @@ class ErrorHandlingTest < Minitest::Test

  def test_with_line_numbers_adds_numbers_to_parser_errors_with_whitespace_trim
    err = assert_raises(SyntaxError) do
-      Liquid::Template.parse(%q(
+      Liquid::Template.parse('
          foobar

          {%- "cat" | foobar -%}

          bla
-        ),
-        line_numbers: true
-      )
+        ',
+        line_numbers: true)
    end

    assert_match(/Liquid syntax error \(line 4\)/, err.message)
@@ -122,11 +122,10 @@ class ErrorHandlingTest < Minitest::Test
        bla
            ',
      error_mode: :warn,
-      line_numbers: true
-    )
+      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
@@ -139,11 +138,10 @@ class ErrorHandlingTest < Minitest::Test
          bla
                ',
        error_mode: :strict,
-        line_numbers: true
-      )
+        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
@@ -157,41 +155,40 @@ class ErrorHandlingTest < Minitest::Test

          bla
                ',
-        line_numbers: true
-      )
+        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
@@ -205,41 +202,47 @@ class ErrorHandlingTest < Minitest::Test
  def test_default_exception_renderer_with_internal_error
    template = Liquid::Template.parse('This is a runtime error: {{ errors.runtime_error }}', line_numbers: true)

-    output = template.render({ 'errors' => ErrorDrop.new })
+    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 })
+    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
-    def read_template_file(template_path)
+    def read_template_file(_template_path)
      "{{ errors.argument_error }}"
    end
  end
@@ -249,12 +252,13 @@ 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
--- a/test/integration/filter_test.rb
+++ b/test/integration/filter_test.rb
@@ -1,24 +1,26 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 module MoneyFilter
  def money(input)
-    sprintf(' %d$ ', input)
+    format(' %d$ ', input)
  end

  def money_with_underscore(input)
-    sprintf(' %d$ ', input)
+    format(' %d$ ', input)
  end
 end

 module CanadianMoneyFilter
  def money(input)
-    sprintf(' %d$ CAD ', input)
+    format(' %d$ CAD ', input)
  end
 end

 module SubstituteFilter
  def substitute(input, params = {})
-    input.gsub(/%\{(\w+)\}/) { |match| params[$1] }
+    input.gsub(/%\{(\w+)\}/) { |_match| params[Regexp.last_match(1)] }
  end
 end

@@ -26,7 +28,7 @@ class FiltersTest < Minitest::Test
  include Liquid

  module OverrideObjectMethodFilter
-    def tap(input)
+    def tap(_input)
      "tap overridden"
    end
  end
@@ -39,13 +41,13 @@ 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
@@ -53,103 +55,103 @@ 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

@@ -165,8 +167,8 @@ 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

--- a/test/integration/hash_ordering_test.rb
+++ b/test/integration/hash_ordering_test.rb
@@ -1,15 +1,17 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class HashOrderingTest < Minitest::Test
  module MoneyFilter
    def money(input)
-      sprintf(' %d$ ', input)
+      format(' %d$ ', input)
    end
  end

  module CanadianMoneyFilter
    def money(input)
-      sprintf(' %d$ CAD ', input)
+      format(' %d$ CAD ', input)
    end
  end

--- a/test/integration/output_test.rb
+++ b/test/integration/output_test.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 module FunnyFilter
-  def make_funny(input)
+  def make_funny(_input)
    'LOL'
  end

@@ -32,7 +34,7 @@ class OutputTest < Minitest::Test
  def setup
    @assigns = {
      'best_cars' => 'bmw',
-      'car' => { 'bmw' => 'good', 'gm' => 'bad' }
+      'car' => { 'bmw' => 'good', 'gm' => 'bad' },
    }
  end

@@ -40,84 +42,84 @@ 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
--- a/test/integration/parse_tree_visitor_test.rb
+++ b/test/integration/parse_tree_visitor_test.rb
@@ -227,7 +227,7 @@ class ParseTreeVisitorTest < Minitest::Test
      [[nil, [
        [nil, [[nil, [["other", []]]]]],
        ["test", []],
-        ["xs", []]
+        ["xs", []],
      ]]],
      traversal(%({% for x in xs offset: test %}{{ other }}{% endfor %})).visit
    )
@@ -238,7 +238,7 @@ class ParseTreeVisitorTest < Minitest::Test
  def traversal(template)
    ParseTreeVisitor
      .for(Template.parse(template).root)
-      .add_callback_for(VariableLookup, &:name)
+      .add_callback_for(VariableLookup) { |node| node.name } # rubocop:disable Style/SymbolProc
  end

  def visit(template)
--- a/test/integration/parsing_quirks_test.rb
+++ b/test/integration/parsing_quirks_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class ParsingQuirksTest < Minitest::Test
@@ -5,7 +7,7 @@ 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
@@ -27,7 +29,7 @@ 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}}")
@@ -62,15 +64,15 @@ 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
--- a/test/integration/registers/disabled_tags_test.rb
+++ b/test/integration/registers/disabled_tags_test.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class DisabledTagsTest < Minitest::Test
+  include Liquid
+
+  class DisableRaw < Block
+    disable_tags "raw"
+  end
+
+  class DisableRawEcho < Block
+    disable_tags "raw", "echo"
+  end
+
+  def test_disables_raw
+    with_custom_tag('disable', DisableRaw) do
+      assert_template_result 'raw usage is not allowed in this contextfoo', '{% disable %}{% raw %}Foobar{% endraw %}{% echo "foo" %}{% enddisable %}'
+    end
+  end
+
+  def test_disables_echo_and_raw
+    with_custom_tag('disable', DisableRawEcho) do
+      assert_template_result 'raw usage is not allowed in this contextecho usage is not allowed in this context', '{% disable %}{% raw %}Foobar{% endraw %}{% echo "foo" %}{% enddisable %}'
+    end
+  end
+end
--- a/test/integration/render_profiling_test.rb
+++ b/test/integration/render_profiling_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'

 class RenderProfilingTest < Minitest::Test
@@ -17,35 +19,35 @@ 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
@@ -55,9 +57,9 @@ 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
@@ -65,14 +67,14 @@ 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
@@ -80,7 +82,7 @@ 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
@@ -128,27 +130,42 @@ class RenderProfilingTest < Minitest::Test
    t.render!

    timing_count = 0
-    t.profiler.each do |timing|
+    t.profiler.each do |_timing|
      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"] })
+    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
+    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)
  end
 end
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Feken Baboyan	8541c6be35	make Template override static registers only when the register key is not defined	2020-05-28 09:08:03 -04:00
Thierry Joyal	18654526c8	Merge pull request #1257 from Shopify/StaticRegisters/remove-registers-attr-reader [StaticRegisters] Remove registers attr_reader	2020-05-22 14:01:37 -04:00
Thierry Joyal	bd1f7f9492	[StaticRegisters] Remove assertion for delete to not remove static content	2020-05-22 13:42:44 -04:00
Thierry Joyal	40d75dd283	Update test/unit/static_registers_unit_test.rb Co-authored-by: Dylan Thacker-Smith <dylan.smith@shopify.com>	2020-05-22 12:15:52 -04:00
Thierry Joyal	f5011365f1	[StaticRegisters] Remove registers attr_reader	2020-05-22 10:51:07 -04:00
Thierry Joyal	ebbd046c92	Merge pull request #1250 from Shopify/static-registers/fetch-raise-on-missing [StaticRegisters] Fetch raise on missing	2020-05-22 09:56:05 -04:00
Thierry Joyal	b9979088ec	[StaticRegisters] Fetch raise on missing Co-authored-by: Dylan Thacker-Smith <dylan.smith@shopify.com>	2020-05-22 09:35:47 -04:00
Dylan Thacker-Smith	bd0e53bd2e	Merge pull request #1239 from Shopify/remove-bad-arity-assumption Fix ParseTreeVisitorTest for ruby-head	2020-05-21 14:02:04 -04:00
Thierry Joyal	4b586f4105	Merge pull request #1251 from Shopify/travis/optional-head [Travis] Optional head	2020-05-21 13:51:11 -04:00
Thierry Joyal	0410119d5f	[Travis] Optional head	2020-05-21 12:45:14 -04:00
Dylan Thacker-Smith	c2f67398d0	Allow ruby-head failures Ignore an object allocation test failure on ruby-head for now.	2020-03-31 10:53:49 -04:00
Dylan Thacker-Smith	81149344a5	Fix ParseTreeVisitorTest for ruby-head	2020-03-31 10:53:46 -04:00
Dylan Thacker-Smith	e9b649b345	Fix Liquid::Template inheritance (#1227 ) self.class.default_resource_limits would return `nil` in a subclass, since the attribute isn't set on subclasses.	2020-01-21 15:09:22 -05:00
Celso Dantas	9c538f4237	Merge pull request #1207 from Shopify/moving-const-to-const Use String literal instead	2020-01-20 12:37:57 -05:00
Celso Dantas	c08a358a2b	Use String literal instead of using a class method The class method string definition is not needed here, so it can be removed.	2020-01-16 09:42:32 -05:00
Justin Li	dbaef5e79b	Merge pull request #1180 from Shopify/test-all-filters Test all filters against random data to detect exceptions	2020-01-13 15:52:44 -05:00
Dylan Thacker-Smith	48a155a213	Initialize Liquid::Template class attributes eagerly instead of lazily (#1223 )	2020-01-10 17:42:01 -05:00
Dylan Thacker-Smith	c69a9a77c6	Merge pull request #1215 from Shopify/nested-liquid-tag Fix liquid tag nested in outer block	2020-01-09 19:24:52 -05:00
Dylan Thacker-Smith	ef79fa3898	style: Avoid deep nesting for parsing the liquid tag in the block body	2020-01-09 19:13:13 -05:00
Dylan Thacker-Smith	f7ad602bfc	Fix liquid tag nested in outer block	2020-01-09 19:13:13 -05:00
Dylan Thacker-Smith	ffd6049ba2	Merge pull request #1222 from Shopify/bump-ci-ruby Test against the latest ruby in CI	2020-01-09 18:12:36 -05:00
Dylan Thacker-Smith	b3ad54c0c2	Test against the latest ruby in CI	2020-01-09 13:15:34 -05:00
Dylan Thacker-Smith	67eca3f58d	Upgrade rubocop and style guide for ruby 2.7 compatibility	2020-01-09 13:15:34 -05:00
Thierry Joyal	0847bf560f	Merge pull request #1218 from Shopify/strainer/remove-safe-navigation Remove handling of a nil context in the Strainer class	2020-01-07 11:54:49 -05:00
Dylan Thacker-Smith	8074565c3e	Merge pull request #1216 from Shopify/unsupported-taint-mode Remove support for taint_mode on ruby versions that don't support it	2020-01-07 10:12:36 -05:00
Thierry Joyal	24e81267b9	Merge pull request #1208 from Shopify/strainer/revisit [Strainer] Separate factory from template	2020-01-06 13:56:22 -05:00
Thierry Joyal	c0ffee3ff9	[Strainer] Remove safe navigation	2020-01-06 18:34:13 +00:00
Thierry Joyal	c0ffeeef26	[Strainer] Separate factory from template	2020-01-06 17:45:25 +00:00
Dylan Thacker-Smith	22dbf90b7d	Try to stay compatible with ruby-head	2019-12-19 11:12:55 -05:00
Dylan Thacker-Smith	40c68c9c83	Remove support for taint_mode on ruby versions that don't support it	2019-12-19 11:12:51 -05:00
Martin Morissette	b7f0f158ab	Merge pull request #1212 from Shopify/template-factory Introduce template factory	2019-12-19 08:52:22 -05:00
Martin Morissette	d8f31046a9	Introduce template factory	2019-12-17 21:45:08 -05:00
Martin Morissette	6c6382ed69	Merge pull request #1213 from Shopify/allow-failures-ruby-27 Make ruby 2.7 optional in CI	2019-12-16 09:46:12 -05:00
Martin Morissette	53ba1372f9	Make ruby 2.7 optional in CI	2019-12-16 08:59:26 -05:00
Mike Angell	57c9cf64eb	Allow render to handle with and for correctly (#1193 ) * Allow render to handle with and for correctly * code improvements	2019-10-23 04:12:46 +10:00
Alessandro Diogo Brückheimer	e83b1e4159	Add ForceEqualSignAlignment to .rubocop.yml (#1190 ) * Add ForceEqualSignAlignment to .rubocop.yml * Revert ForceEqualSignAlignment cop * Update method alignment * Undo addition of whitespace to improve readability * Fix missing alignment	2019-10-21 21:18:48 +10:00
Mike Angell	3784020a8d	[New Feature] Add forloop inside render tag when using for syntax (#1191 ) * Add forloop to render for syntax * Remove forloop guard	2019-10-17 23:06:13 +10:00
uchoudh	1223444738	Fix flaky tests (#1186 )	2019-10-12 02:52:07 +11:00
Mike Angell	2bfeed2b00	Resolve InputIterator dropping context (#1184 ) * Resolve InputIterator dropping context * Prefer attr_reader	2019-10-09 08:00:16 +11:00
Mike Angell	04b800d768	Add support for `as` in Render and Include tags (#1181 ) * Add support for alias * Remove duplicate code * Default to template name * Improve variable matching * Extract render_partial * remove method	2019-10-09 07:59:52 +11:00
Mike Angell	f1d62978ef	Allow default function to handle false as value (#1144 ) * Allow default function to handle false as value * Change to named parameter * Remove redundant freeze * add brackets to make intention clearer * Use named param format from liquid * Update syntax * document default filter	2019-10-09 04:03:33 +11:00
uchoudh	ffadc64f28	Merge pull request #1172 from Shopify/add-liquid-profiling-attr Add liquid profile attributes	2019-10-08 10:49:54 -04:00
Mike Angell	5302f40342	Rubocop fixes (#1182 )	2019-10-07 17:06:47 +11:00
Mike Angell	b0f8c2c03e	Remove error logging	2019-10-05 01:13:35 +10:00
Mike Angell	37e40673ff	Filter test	2019-10-04 17:00:54 +10:00
uchoudh	fefee4c675	Add liquid profile attributes Attribute testing Add partial name support	2019-10-03 10:12:39 -04:00
Mike Angell	1aa7d3d2ba	Change registers to by symbols (#1178 )	2019-09-27 04:32:24 +10:00
Mike Angell	0db9c56f34	Disable rendering of tag based on register (#1162 ) * Disable rendering of tag based on register * Improvements to disable tag * Resolve disbale tag tests * Test disable_tags register * disabled_tags is now always avaiable * Allow multiple tags to be disabled at once * Move disabled check to block_body * Code improvements * Remove redundant nil check * Improve disabled tag error output * Improve disable tag API * Code improvements * Switch disabled? to not mutate output * Fix array handling shortcut in disable_tags	2019-09-26 00:18:30 +10:00
Mike Angell	f4d134cd5c	Remove jruby and truffleruby testing (#1167 )	2019-09-20 02:28:43 +10:00
Mike Angell	b667bcb48b	Shopify stye guide fixes (#1160 )	2019-09-20 02:08:11 +10:00
Ashwin Maroli	2c14e0b2ba	Use `Regexp#match?` when `MatchData` is not used (#1165 ) * Use `Regexp#match?` when `MatchData` is not used * Add `TargetRubyVersion: 2.4` to RuboCop config	2019-09-20 02:07:52 +10:00
Ashwin Maroli	ca207ed93f	Cleanup RuboCop configuration file (#1161 )	2019-09-20 00:55:01 +10:00
Mike Angell	ef13343591	Changes static registers to not be frozen (#1163 ) * Changes static registers to not be frozen * Add frozen test to static registers	2019-09-20 00:24:48 +10:00
Mike Angell	adb40c41b7	Enable frozen_string_literal	2019-09-18 13:40:07 +10:00
Mike Angell	d8403af515	Reimplementation of Static Registers (#1157 )	2019-09-18 13:25:55 +10:00
Mike Angell	0d26f05bb8	Enabled frozen string literals (#1154 ) * Enabled frozen string literals * Update rubocop config * Prefer string interpolation in simple cases Co-Authored-By: Dylan Thacker-Smith <dylan.smith@shopify.com>	2019-09-18 13:19:45 +10:00
Thierry Joyal	1dcad34b06	Merge pull request #1151 from Shopify/invokable-methods-for-enumerable-reject-include Invokable methods for enumerable reject include?	2019-09-16 09:49:40 -04:00
Mike Angell	9a42c8c8b2	Merge pull request #1149 from Shopify/liquid-usage Add usage tracking	2019-09-16 12:14:50 +10:00
Mike Angell	1fcef2133f	Merge pull request #1143 from Shopify/styling-fixes-1 Apply simple rubocop fixes	2019-09-16 12:14:32 +10:00
Mike Angell	d7514b1305	Merge pull request #1137 from Shopify/remove-lazy-stacks Remove lazy load stacks	2019-09-16 12:14:14 +10:00
Thierry Joyal	c0ffee5919	Invokable methods for enumerable reject include?	2019-09-12 12:58:51 +00:00
Mike Angell	724d02e9b3	Disable interrupt fix in this round	2019-09-11 06:35:08 +10:00
Mike Angell	a5b387cdd4	Remove reserved word Interrupt to avoid confusion Also resolves rubocop conflicts	2019-09-11 06:32:31 +10:00
Mike Angell	8318be2edc	Update readme	2019-09-11 05:20:05 +10:00
Mike Angell	b6547f322e	Simplify usage	2019-09-11 04:56:25 +10:00
Mike Angell	b316ff8413	Add usage tracking	2019-09-11 04:20:34 +10:00
Justin Li	806b2622da	Switch back to Liquid-C master, since https://github.com/Shopify/liquid-c/pull/50 is merged	2019-09-04 15:12:51 -04:00
Mike Angell	1f90a37b63	Merge branch 'master' into styling-fixes-1	2019-09-04 14:26:27 +10:00
Mike Angell	c34f7c9b2c	Merge pull request #1145 from Shopify/master-fixes Render tag styling fixes	2019-09-04 14:25:38 +10:00
Mike Angell	604d899496	Render tag styling fixes	2019-08-31 22:48:25 +10:00
Mike Angell	799da202df	Apply simple rubocop fixes	2019-08-31 21:58:33 +10:00
Mike Angell	dafbb4ae90	Remove hasnling false scopes	2019-08-31 20:03:54 +10:00
Mike Angell	2324564743	Remove lazy load stacks Remove lazy load stacks and instead only create a new scope when a tag is known to need one	2019-08-29 09:09:32 +10:00