Ensure liquid value during spaceship comparisons.

* Make all array filters that use `filter_array` util process empty string and nil correctly

* up version

* fix ordering of checks

* also do it for map

* Do not raise property error

* Gracefully empty property in map filter

---------

Co-authored-by: Marco Concetto Rudilosso <[email protected]>

Gemfile

@@ -25,8 +25,6 @@ group :development do
 end
 
 group :test do
-  gem 'ruby-lsp'
-  gem 'debug'
   gem 'rubocop', '~> 1.61.0'
   gem 'rubocop-shopify', '~> 2.12.0', require: false
   gem 'rubocop-performance', require: false

lib/liquid.rb

@@ -80,8 +80,6 @@ require 'liquid/variable_lookup'
 require 'liquid/range_lookup'
 require 'liquid/resource_limits'
 require 'liquid/expression'
-require 'liquid/expression/comparison_expression'
-require 'liquid/expression/logical_expression'
 require 'liquid/template'
 require 'liquid/condition'
 require 'liquid/utils'

lib/liquid/condition.rb

@@ -52,10 +52,6 @@ module Liquid
       @@method_literals[markup] || parse_context.parse_expression(markup)
     end
 
-    def self.parse(markup, ss, cache)
-      @@method_literals[markup] || Expression.parse(markup, ss, cache)
-    end
-
     attr_reader :attachment, :child_condition
     attr_accessor :left, :operator, :right
 
@@ -116,15 +112,11 @@ module Liquid
     private
 
     def equal_variables(left, right)
-      if left.is_a?(MethodLiteral) && right.is_a?(MethodLiteral)
-        return left.to_s == right.to_s
-      end
-
       if left.is_a?(MethodLiteral)
         if right.respond_to?(left.method_name)
           return right.send(left.method_name)
         else
-          return left.to_s == right
+          return nil
         end
       end
 
@@ -132,7 +124,7 @@ module Liquid
         if left.respond_to?(right.method_name)
           return left.send(right.method_name)
         else
-          return right.to_s == left
+          return nil
         end
       end
 

lib/liquid/expression.rb

@@ -26,7 +26,6 @@ module Liquid
     RANGES_REGEX = /\A\(\s*(?>(\S+)\s*\.\.)\s*(\S+)\s*\)\z/
     INTEGER_REGEX = /\A(-?\d+)\z/
     FLOAT_REGEX = /\A(-?\d+)\.\d+\z/
-    QUOTED_STRING = /\A#{QuotedString}\z/
 
     class << self
       def parse(markup, ss = StringScanner.new(""), cache = nil)
@@ -34,9 +33,12 @@ module Liquid
 
         markup = markup.strip # markup can be a frozen string
 
-        return markup[1..-2] if QUOTED_STRING.match?(markup)
-
-        return LITERALS[markup] if LITERALS.key?(markup)
+        if (markup.start_with?('"') && markup.end_with?('"')) ||
+          (markup.start_with?("'") && markup.end_with?("'"))
+          return markup[1..-2]
+        elsif LITERALS.key?(markup)
+          return LITERALS[markup]
+        end
 
         # Cache only exists during parsing
         if cache
@@ -49,9 +51,6 @@ module Liquid
       end
 
       def inner_parse(markup, ss, cache)
-        return LogicalExpression.parse(markup, ss, cache)    if LogicalExpression.logical?(markup)
-        return ComparisonExpression.parse(markup, ss, cache) if ComparisonExpression.comparison?(markup)
-
         if (markup.start_with?("(") && markup.end_with?(")")) && markup =~ RANGES_REGEX
           return RangeLookup.parse(
             Regexp.last_match(1),

lib/liquid/expression/comparison_expression.rb

@@ -1,31 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Expression
-    class ComparisonExpression
-      # We can improve the resiliency of lax parsing by not expecting whitespace
-      # surrounding the operator (ie \s+ => \s*).
-      # However this is not in parity with existing lax parsing behavior.
-      COMPARISON_REGEX = /\A\s*(.+?)\s+(==|!=|<>|<=|>=|<|>|contains)\s+(.+)\s*\z/
-
-      class << self
-        def comparison?(markup)
-          markup.match(COMPARISON_REGEX)
-        end
-
-        def parse(markup, ss, cache)
-          match = comparison?(markup)
-
-          if match
-            left = Condition.parse(match[1].strip, ss, cache)
-            operator = match[2].strip
-            right = Condition.parse(match[3].strip, ss, cache)
-            return Condition.new(left, operator, right)
-          end
-
-          Condition.new(parse(markup, ss, cache), nil, nil)
-        end
-      end
-    end
-  end
-end

lib/liquid/expression/logical_expression.rb

@@ -1,59 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Expression
-    class LogicalExpression
-      LOGICAL_REGEX = /\A\s*(.+?)\s+(and|or)\s+(.+)\s*\z/i
-      EXPRESSIONS_AND_OPERATORS = /(?:\b(?:\s?and\s?|\s?or\s?)\b|(?:\s*(?!\b(?:\s?and\s?|\s?or\s?)\b)(?:#{QuotedFragment}|\S+)\s*)+)/o
-      BOOLEAN_OPERATORS = ['and', 'or'].freeze
-
-      class << self
-        def logical?(markup)
-          markup.match(LOGICAL_REGEX)
-        end
-
-        def boolean_operator?(markup)
-          BOOLEAN_OPERATORS.include?(markup)
-        end
-
-        def parse(markup, ss, cache)
-          expressions = markup.scan(EXPRESSIONS_AND_OPERATORS)
-
-          expression = expressions.pop
-          condition  = parse_condition(expression, ss, cache)
-
-          until expressions.empty?
-            operator = expressions.pop.to_s.strip
-
-            next unless boolean_operator?(operator)
-
-            expression    = expressions.pop.to_s.strip
-            new_condition = parse_condition(expression, ss, cache)
-
-            case operator
-            when 'and' then new_condition.and(condition)
-            when 'or'  then new_condition.or(condition)
-            end
-
-            condition = new_condition
-          end
-
-          condition
-        end
-
-        private
-
-        def parse_condition(expr, ss, cache)
-          return ComparisonExpression.parse(expr, ss, cache) if comparison?(expr)
-          return LogicalExpression.parse(expr, ss, cache)    if logical?(expr)
-
-          Condition.new(Expression.parse(expr, ss, cache), nil, nil)
-        end
-
-        def comparison?(...)
-          ComparisonExpression.comparison?(...)
-        end
-      end
-    end
-  end
-end

lib/liquid/lexer.rb

@@ -14,8 +14,6 @@ module Liquid
     COMPARISON_LESS_THAN = [:comparison, "<"].freeze
     COMPARISON_LESS_THAN_OR_EQUAL = [:comparison, "<="].freeze
     COMPARISON_NOT_EQUAL_ALT = [:comparison, "<>"].freeze
-    BOOLEAN_AND = [:boolean_operator, "and"].freeze
-    BOOLEAN_OR = [:boolean_operator, "or"].freeze
     DASH = [:dash, "-"].freeze
     DOT = [:dot, "."].freeze
     DOTDOT = [:dotdot, ".."].freeze
@@ -153,10 +151,6 @@ module Liquid
               # Special case for "contains"
               output << if type == :id && t == "contains" && output.last&.first != :dot
                 COMPARISON_CONTAINS
-              elsif type == :id && t == "and" && output.last&.first != :dot
-                BOOLEAN_AND
-              elsif type == :id && t == "or" && output.last&.first != :dot
-                BOOLEAN_OR
               else
                 [type, t]
               end

lib/liquid/parser.rb

@@ -48,7 +48,7 @@ module Liquid
 
     def expression
       token = @tokens[@p]
-      expr = case token[0]
+      case token[0]
       when :id
         str = consume
         str << variable_lookups
@@ -69,21 +69,6 @@ module Liquid
       else
         raise SyntaxError, "#{token} is not a valid expression"
       end
-      if look(:comparison)
-        operator = consume(:comparison)
-        left     = expr
-        right    = expression
-
-        "#{left} #{operator} #{right}"
-      elsif look(:boolean_operator)
-        operator = consume(:boolean_operator)
-        left     = expr
-        right    = expression
-
-        "#{left} #{operator} #{right}"
-      else
-        expr
-      end
     end
 
     def argument

lib/liquid/standardfilters.rb

@@ -3,7 +3,6 @@
 require 'cgi'
 require 'base64'
 require 'bigdecimal'
-
 module Liquid
   module StandardFilters
     MAX_I32 = (1 << 31) - 1
@@ -387,6 +386,7 @@ module Liquid
         end
       elsif ary.all? { |el| el.respond_to?(:[]) }
         begin
+          property = Utils.to_s(property)
           ary.sort { |a, b| nil_safe_compare(a[property], b[property]) }
         rescue TypeError
           raise_property_error(property)
@@ -416,6 +416,7 @@ module Liquid
         end
       elsif ary.all? { |el| el.respond_to?(:[]) }
         begin
+          property = Utils.to_s(property)
           ary.sort { |a, b| nil_safe_casecmp(a[property], b[property]) }
         rescue TypeError
           raise_property_error(property)
@@ -503,6 +504,7 @@ module Liquid
       elsif ary.empty? # The next two cases assume a non-empty array.
         []
       else
+        property = Utils.to_s(property)
         ary.uniq do |item|
           item[property]
         rescue TypeError
@@ -534,6 +536,11 @@ module Liquid
     # @liquid_syntax array | map: string
     # @liquid_return [array[untyped]]
     def map(input, property)
+      property = Utils.to_s(property)
+
+      # Return the input array if property is empty (no-op)
+      return InputIterator.new(input, context).to_a if property.empty?
+
       InputIterator.new(input, context).map do |e|
         e = e.call if e.is_a?(Proc)
 
@@ -563,6 +570,7 @@ module Liquid
       elsif ary.empty? # The next two cases assume a non-empty array.
         []
       else
+        property = Liquid::Utils.to_s(property)
         ary.reject do |item|
           item[property].nil?
         rescue TypeError
@@ -712,7 +720,16 @@ module Liquid
       input.gsub(/\r?\n/, "<br />\n")
     end
 
-    # Reformat a date using Ruby's core Time#strftime( string ) -> string
+    # @liquid_public_docs
+    # @liquid_type filter
+    # @liquid_category date
+    # @liquid_summary
+    #   Formats a date according to a specified format string.
+    # @liquid_description
+    #   This filter formats a date using various format specifiers. If the format string is empty,
+    #   the original input is returned. If the input cannot be converted to a date, the original input is returned.
+    #
+    #   The following format specifiers can be used:
     #
     #   %a - The abbreviated weekday name (``Sun'')
     #   %A - The  full  weekday  name (``Sunday'')
@@ -741,8 +758,8 @@ module Liquid
     #   %Y - Year with century
     #   %Z - Time zone name
     #   %% - Literal ``%'' character
-    #
-    #   See also: http://www.ruby-doc.org/core/Time.html#method-i-strftime
+    # @liquid_syntax date | date: string
+    # @liquid_return [string]
     def date(input, format)
       str_format = Utils.to_s(format)
       return input if str_format.empty?
@@ -943,6 +960,8 @@ module Liquid
     # @liquid_syntax array | sum
     # @liquid_return [number]
     def sum(input, property = nil)
+      property = property.nil? ? nil : Utils.to_s(property)
+
       ary = InputIterator.new(input, context)
       return 0 if ary.empty?
 
@@ -971,9 +990,10 @@ module Liquid
 
     def filter_array(input, property, target_value, default_value = [], &block)
       ary = InputIterator.new(input, context)
-
       return default_value if ary.empty?
 
+      property = Utils.to_s(property)
+
       block.call(ary) do |item|
         if target_value.nil?
           item[property]
@@ -998,7 +1018,7 @@ module Liquid
     end
 
     def nil_safe_compare(a, b)
-      result = a <=> b
+      result = Utils.to_liquid_value(a) <=> Utils.to_liquid_value(b)
 
       if result
         result

lib/liquid/tags/decrement.rb

@@ -10,7 +10,7 @@ module Liquid
   # @liquid_description
   #   Variables that are declared with `decrement` are unique to the [layout](/themes/architecture/layouts), [template](/themes/architecture/templates),
   #   or [section](/themes/architecture/sections) file that they're created in. However, the variable is shared across
-  #   [snippets](/themes/architecture#snippets) included in the file.
+  #   [snippets](/themes/architecture/snippets) included in the file.
   #
   #   Similarly, variables that are created with `decrement` are independent from those created with [`assign`](/docs/api/liquid/tags/assign)
   #   and [`capture`](/docs/api/liquid/tags/capture). However, `decrement` and [`increment`](/docs/api/liquid/tags/increment) share

lib/liquid/tags/doc.rb

@@ -13,6 +13,10 @@ module Liquid
   #   Liquid code inside will be parsed but not executed. This facilitates
   #   tooling support for features like code completion, linting, and inline
   #   documentation.
+  #
+  #   For detailed documentation syntax and examples, see the
+  #   [`LiquidDoc` reference](/docs/storefronts/themes/tools/liquid-doc).
+  #
   # @liquid_syntax
   #   {% doc %}
   #     Renders a message.

lib/liquid/tags/include.rb

@@ -6,7 +6,7 @@ module Liquid
   # @liquid_category theme
   # @liquid_name include
   # @liquid_summary
-  #   Renders a [snippet](/themes/architecture#snippets).
+  #   Renders a [snippet](/themes/architecture/snippets).
   # @liquid_description
   #   Inside the snippet, you can access and alter variables that are [created](/docs/api/liquid/tags/variable-tags) outside of the
   #   snippet.

lib/liquid/tags/increment.rb

@@ -10,7 +10,7 @@ module Liquid
   # @liquid_description
   #   Variables that are declared with `increment` are unique to the [layout](/themes/architecture/layouts), [template](/themes/architecture/templates),
   #   or [section](/themes/architecture/sections) file that they're created in. However, the variable is shared across
-  #   [snippets](/themes/architecture#snippets) included in the file.
+  #   [snippets](/themes/architecture/snippets) included in the file.
   #
   #   Similarly, variables that are created with `increment` are independent from those created with [`assign`](/docs/api/liquid/tags/assign)
   #   and [`capture`](/docs/api/liquid/tags/capture). However, `increment` and [`decrement`](/docs/api/liquid/tags/decrement) share

lib/liquid/tags/render.rb

@@ -6,7 +6,7 @@ module Liquid
   # @liquid_category theme
   # @liquid_name render
   # @liquid_summary
-  #   Renders a [snippet](/themes/architecture#snippets) or [app block](/themes/architecture/sections/section-schema#render-app-blocks).
+  #   Renders a [snippet](/themes/architecture/snippets) or [app block](/themes/architecture/sections/section-schema#render-app-blocks).
   # @liquid_description
   #   Inside snippets and app blocks, you can't directly access variables that are [created](/docs/api/liquid/tags/variable-tags) outside
   #   of the snippet or app block. However, you can [specify variables as parameters](/docs/api/liquid/tags/render#render-passing-variables-to-a-snippet)

lib/liquid/version.rb

@@ -2,5 +2,5 @@
 # frozen_string_literal: true
 
 module Liquid
-  VERSION = "5.8.1"
+  VERSION = "5.8.3"
 end

test/integration/standard_filter_test.rb

@@ -560,15 +560,47 @@ class StandardFiltersTest < Minitest::Test
     end
   end
 
-  def test_map_returns_empty_with_no_property
-    foo = [
+  def test_map_with_nil_property
+    array = [
+      { "handle" => "alpha", "value" => "A" },
+      { "handle" => "beta", "value" => "B" },
+      { "handle" => "gamma", "value" => "C" }
+    ]
+
+    assert_template_result("alpha beta gamma", "{{ array | map: nil | map: 'handle' | join: ' ' }}", { "array" => array })
+  end
+
+  def test_map_with_empty_string_property
+    array = [
+      { "handle" => "alpha", "value" => "A" },
+      { "handle" => "beta", "value" => "B" },
+      { "handle" => "gamma", "value" => "C" }
+    ]
+
+    assert_template_result("alpha beta gamma", "{{ array | map: '' | map: 'handle' | join: ' ' }}", { "array" => array })
+  end
+
+  def test_map_with_value_property
+    array = [
+      { "handle" => "alpha", "value" => "A" },
+      { "handle" => "beta", "value" => "B" },
+      { "handle" => "gamma", "value" => "C" }
+    ]
+
+    assert_template_result("A B C", "{{ array | map: 'value' | join: ' ' }}", { "array" => array })
+  end
+
+  def test_map_returns_input_with_no_property
+    input = [
       [1],
       [2],
       [3],
     ]
-    assert_raises(Liquid::ArgumentError) do
-      @filters.map(foo, nil)
-    end
+    result = @filters.map(input, nil)
+    assert_equal(input.flatten, result)
+
+    result = @filters.map(input, '')
+    assert_equal(input.flatten, result)
   end
 
   def test_sort_works_on_enumerables
@@ -1033,6 +1065,22 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result(expected_output, template, { "array" => array })
   end
 
+  def test_where_with_empty_string_is_a_no_op
+    environment = { "array" => ["alpha", "beta", "gamma"] }
+    expected_output = "alpha beta gamma"
+    template = "{{ array | where: '' | join: ' ' }}"
+
+    assert_template_result(expected_output, template, environment)
+  end
+
+  def test_where_with_nil_is_a_no_op
+    environment = { "array" => ["alpha", "beta", "gamma"] }
+    expected_output = "alpha beta gamma"
+    template = "{{ array | where: nil | join: ' ' }}"
+
+    assert_template_result(expected_output, template, environment)
+  end
+
   def test_where_with_value
     array = [
       { "handle" => "alpha", "ok" => true },
@@ -1061,6 +1109,19 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result(expected_output, template, { "array" => array })
   end
 
+  def test_where_with_non_string_property
+    array = [
+      { "handle" => "alpha", "{}" => true },
+      { "handle" => "beta", "{}" => false },
+      { "handle" => "gamma", "{}" => false },
+      { "handle" => "delta", "{}" => true },
+    ]
+    template = "{{ array | where: some_property, true | map: 'handle' | join: ' ' }}"
+    expected_output = "alpha delta"
+
+    assert_template_result(expected_output, template, { "array" => array, "some_property" => {} })
+  end
+
   def test_where_string_keys
     input = [
       "alpha", "beta", "gamma", "delta"
@@ -1268,6 +1329,17 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result("0", "{{ input | sum: 'subtotal' }}", { "input" => input })
   end
 
+  def test_sum_with_non_string_property
+    input = [{ "true" => 1 }, { "1.0" => 0.2, "1" => -0.3 }, { "1..5" => 0.4 }]
+
+    assert_equal(1, @filters.sum(input, true))
+    assert_equal(0.2, @filters.sum(input, 1.0))
+    assert_equal(-0.3, @filters.sum(input, 1))
+    assert_equal(0.4, @filters.sum(input, (1..5)))
+    assert_equal(0, @filters.sum(input, nil))
+    assert_equal(0, @filters.sum(input, ""))
+  end
+
   private
 
   def with_timezone(tz)

test/unit/boolean_unit_test.rb

@@ -1,546 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class BooleanUnitTest < Minitest::Test
-  include Liquid
-  def test_simple_boolean_comparison
-    assert_parity("1 > 0", "true")
-    assert_parity("1 < 0", "false")
-  end
-
-  def test_boolean_and_operator
-    assert_parity("true and true", "true")
-    assert_parity("true and false", "false")
-  end
-
-  def test_boolean_or_operator
-    assert_parity("true or false", "true")
-    assert_parity("false or false", "false")
-  end
-
-  def test_operator_precedence
-    assert_parity("false and false or true", "false")
-  end
-
-  def test_complex_boolean_expressions
-    assert_parity("true and true and true", "true")
-    assert_parity("true and false and true", "false")
-    assert_parity("false or false or true", "true")
-  end
-
-  def test_boolean_with_variables
-    assert_parity("a and b", "true", { "a" => true, "b" => true })
-    assert_parity("a and b", "false", { "a" => true, "b" => false })
-    assert_parity("a or b", "true", { "a" => false, "b" => true })
-    assert_parity("a or b", "false", { "a" => false, "b" => false })
-  end
-
-  def test_nil_equals_nil
-    assert_parity("nil == nil", "true")
-  end
-
-  def test_nil_not_equals_nil
-    assert_parity("nil != nil", "false")
-  end
-
-  def test_nil_not_equals_empty_string
-    assert_parity("nil == ''", "false")
-    assert_parity("nil != ''", "true")
-  end
-
-  def test_undefined_variable_in_comparisons
-    assert_parity("undefined_var == nil", "true")
-    assert_parity("undefined_var != nil", "false")
-  end
-
-  def test_undefined_variable_compared_to_empty_string
-    assert_parity("undefined_var == ''", "false")
-    assert_parity("undefined_var != ''", "true")
-  end
-
-  def test_boolean_variable_in_comparisons
-    assert_parity("t == true", "true", { "t" => true })
-    assert_parity("f == false", "true", { "f" => false })
-  end
-
-  def test_boolean_variable_compared_to_nil
-    assert_parity("t == nil", "false", { "t" => true })
-    assert_parity("f == nil", "false", { "f" => false })
-    assert_parity("f != nil", "true", { "f" => false })
-  end
-
-  def test_nil_and_undefined_variables_in_boolean_expressions
-    assert_parity("x == undefined_var", "true", { "x" => nil })
-    assert_parity("x != undefined_var", "false", { "x" => nil })
-  end
-
-  def test_nil_literal_in_or_expression
-    assert_parity("nil or true", "true")
-  end
-
-  def test_nil_variable_in_or_expression
-    assert_parity("x or false", "false", { "x" => nil })
-  end
-
-  def test_mixed_boolean_expressions
-    assert_parity("a > b and c < d", "true",  { "a" => 99, "b" => 0, "c" => 0,  "d" => 99 })
-    assert_parity("a > b and c < d", "false", { "a" => 99, "b" => 0, "c" => 99, "d" => 0  })
-  end
-
-  def test_boolean_assignment_shorthand
-    template = Liquid::Template.parse("{% assign lazy_load = media_position > 1 %}{{ lazy_load }}")
-    assert_equal("false", template.render("media_position" => 1))
-    assert_equal("true",  template.render("media_position" => 2))
-  end
-
-  def test_equality_operators_with_integer_literals
-    assert_expression("1", "1")
-    assert_expression("1 == 1", "true")
-    assert_expression("1 != 1", "false")
-    assert_expression("1 == 2", "false")
-    assert_expression("1 != 2", "true")
-  end
-
-  def test_equality_operators_with_stirng_literals
-    assert_expression("'hello'", "hello")
-    assert_expression("'hello' == 'hello'", "true")
-    assert_expression("'hello' != 'hello'", "false")
-    assert_expression("'hello' == 'world'", "false")
-    assert_expression("'hello' != 'world'", "true")
-  end
-
-  def test_equality_operators_with_float_literals
-    assert_expression("1.5", "1.5")
-    assert_expression("1.5 == 1.5", "true")
-    assert_expression("1.5 != 1.5", "false")
-    assert_expression("1.5 == 2.5", "false")
-    assert_expression("1.5 != 2.5", "true")
-  end
-
-  def test_equality_operators_with_nil_literals
-    assert_expression("nil", "")
-    assert_expression("nil == nil", "true")
-    assert_expression("nil != nil", "false")
-    assert_expression("null == nil", "true")
-    assert_expression("null != nil", "false")
-  end
-
-  def test_equality_operators_with_boolean_literals
-    assert_expression("true", "true")
-    assert_expression("false", "false")
-    assert_expression("true == true", "true")
-    assert_expression("true != true", "false")
-    assert_expression("false == false", "true")
-    assert_expression("false != false", "false")
-    assert_expression("true == false", "false")
-    assert_expression("true != false", "true")
-  end
-
-  def test_equality_operators_with_empty_literals
-    assert_expression("empty", "")
-    assert_expression("empty == ''", "true")
-    assert_expression("empty == empty", "true")
-    assert_expression("empty != empty", "false")
-    assert_expression("blank == blank", "true")
-    assert_expression("blank != blank", "false")
-    assert_expression("empty == blank", "true")
-    assert_expression("empty != blank", "false")
-  end
-
-  def test_nil_renders_as_empty_string
-    # No parity needed here. This is to ensure expressions rendered with {{ }}
-    # will still render as an empty string to preserve pre-existing behavior.
-    assert_expression("nil", "")
-    assert_expression("x", "", { "x" => nil })
-    assert_parity_scenario(:expression, "hello {{ x }}", "hello ", { "x" => nil })
-  end
-
-  def test_nil_comparison_with_blank
-    assert_parity("nil_value == blank", "false")
-    assert_parity("nil_value != blank", "true")
-    assert_parity("undefined != blank", "true")
-    assert_parity("undefined == blank", "false")
-  end
-
-  def test_if_with_variables
-    assert_parity("value", "true",  { "value" => true })
-    assert_parity("value", "false", { "value" => false })
-  end
-
-  def test_nil_variable_in_and_expression
-    assert_condition("x and true", "false", { "x" => nil })
-    assert_condition("true and x", "false", { "x" => nil })
-
-    assert_expression("x and true", "",     { "x" => nil })
-    assert_expression("true and x", "",     { "x" => nil })
-  end
-
-  def test_boolean_variable_in_and_expression
-    assert_parity("true and x", "false", { "x" => false })
-    assert_parity("x and true", "false", { "x" => false })
-
-    assert_parity("true and x", "true",  { "x" => true })
-    assert_parity("x and true", "true",  { "x" => true })
-
-    assert_parity("true or x", "true",   { "x" => false })
-    assert_parity("x or true", "true",   { "x" => false })
-
-    assert_parity("true or x", "true",   { "x" => true })
-    assert_parity("x or true", "true",   { "x" => true })
-  end
-
-  def test_multi_variable_boolean_nil_and_expression
-    assert_condition("x and y", "false", { "x" => nil, "y" => true })
-    assert_condition("y and x", "false", { "x" => true, "y" => nil })
-
-    assert_expression("x and y", "",     { "x" => nil, "y" => true })
-    assert_expression("y and x", "",     { "x" => true, "y" => nil })
-  end
-
-  def test_multi_truthy_variables_and_expressions
-    assert_condition("x or y", "true",   { "x" => nil, "y" => "hello" })
-    assert_condition("y or x", "true",   { "x" => "hello", "y" => nil })
-
-    assert_expression("x or y", "hello", { "x" => nil, "y" => "hello" })
-    assert_expression("y or x", "hello", { "x" => "hello", "y" => nil })
-  end
-
-  def test_multi_variable_boolean_nil_or_expression
-    assert_parity("x or y", "true", { "x" => nil, "y" => true })
-    assert_parity("y or x", "true", { "x" => true, "y" => nil })
-  end
-
-  def test_links_not_blank_with_drop_returns_true_for_all_cases
-    link = LinkDrop.new(
-      levels: 0,
-      links: [
-        LinkDrop.new(levels: 1, links: [], title: "About", type: "page_link", url: "/pages/about"),
-        LinkDrop.new(levels: 1, links: [], title: "Contact", type: "page_link", url: "/pages/contact"),
-      ],
-      title: "Main Menu",
-      type: "menu",
-      url: nil,
-    )
-
-    template = <<~LIQUID
-      {%- if link.links != blank -%}
-        true
-      {%- else -%}
-        false
-      {%- endif -%}
-    LIQUID
-
-    act_output = Liquid::Template.parse(template).render({ "link" => link })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => link.tap { |l| l.links = [] } })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => link.tap { |l| l.links = nil } })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => LinkDrop.new })
-    assert_equal("true", act_output)
-  end
-
-  def test_links_truthy_with_drop_returns_false_for_nil_and_empty_drop
-    link = LinkDrop.new(
-      levels: 0,
-      links: [
-        LinkDrop.new(levels: 1, links: [], title: "About", type: "page_link", url: "/pages/about"),
-        LinkDrop.new(levels: 1, links: [], title: "Contact", type: "page_link", url: "/pages/contact"),
-      ],
-      title: "Main Menu",
-      type: "menu",
-      url: nil,
-    )
-
-    template = <<~LIQUID
-      {%- if link.links -%}
-        true
-      {%- else -%}
-        false
-      {%- endif -%}
-    LIQUID
-
-    act_output = Liquid::Template.parse(template).render({ "link" => link })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => link.tap { |l| l.links = [] } })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => link.tap { |l| l.links = nil } })
-    assert_equal("false", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => {} })
-    assert_equal("false", act_output)
-  end
-
-  def test_links_not_blank_with_hash_returns_true_for_all_cases
-    link = {
-      "levels" => 0,
-      "links" => [
-        {
-          "levels" => 1,
-          "links" => [],
-          "title" => { "text" => "About" },
-          "type" => "page_link",
-          "url" => "/pages/about",
-        },
-        {
-          "levels" => 1,
-          "links" => [],
-          "title" => { "text" => "Contact" },
-          "type" => "page_link",
-          "url" => "/pages/contact",
-        },
-      ],
-      "title" => { "text" => "Main Menu" },
-      "type" => "menu",
-      "url" => nil,
-    }
-
-    template = <<~LIQUID
-      {%- if link.links != blank -%}
-        true
-      {%- else -%}
-        false
-      {%- endif -%}
-    LIQUID
-
-    act_output = Liquid::Template.parse(template).render({ "link" => link })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => { **link, "links" => [] } })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => { **link, "links" => nil } })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => {} })
-    assert_equal("true", act_output)
-  end
-
-  def test_links_truthy_with_hash_returns_false_for_nil_and_empty_hash
-    link = {
-      "levels" => 0,
-      "links" => [
-        {
-          "levels" => 1,
-          "links" => [],
-          "title" => { "text" => "About" },
-          "type" => "page_link",
-          "url" => "/pages/about",
-        },
-        {
-          "levels" => 1,
-          "links" => [],
-          "title" => { "text" => "Contact" },
-          "type" => "page_link",
-          "url" => "/pages/contact",
-        },
-      ],
-      "title" => { "text" => "Main Menu" },
-      "type" => "menu",
-      "url" => nil,
-    }
-
-    template = <<~LIQUID
-      {%- if link.links -%}
-        true
-      {%- else -%}
-        false
-      {%- endif -%}
-    LIQUID
-
-    act_output = Liquid::Template.parse(template).render({ "link" => link })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => { **link, "links" => [] } })
-    assert_equal("true", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => { **link, "links" => nil } })
-    assert_equal("false", act_output)
-
-    act_output = Liquid::Template.parse(template).render({ "link" => {} })
-    assert_equal("false", act_output)
-  end
-
-  def test_conditions_with_boolean_operators_without_whitespace_around_operator
-    template = <<~LIQUID
-      <option variant_id="{{ variant.id }}" {% if current_variant.id==variant.id %}selected{%- endif -%}>{{ variant.title }}</option>
-    LIQUID
-
-    context = {
-      "variant" => {
-        "id" => 420,
-        "title" => "Default Title",
-      },
-      "current_variant" => {
-        "id" => 420,
-      },
-    }
-
-    # Expected output
-    # Note: Ideally we would like the whitespace around the boolean operator to be optional.
-    # So the more correct expected output would be:
-    #
-    # <option variant_id="420" selected>Default Title</option>
-    #
-    # However, the existing behaviour in liquid-ruby is that the whitespace is required around the boolean operator.
-    expected_lax_output = <<~HTML
-      <option variant_id="420" >Default Title</option>
-    HTML
-
-    expected_strict_output = <<~HTML
-      <option variant_id="420" selected>Default Title</option>
-    HTML
-
-    # This bugged output only happens in lax mode.
-    assert_with_lax_parsing(template, expected_lax_output, context)
-
-    # Default test parsing mode (strict) works as properly expected
-    assert_equal(expected_strict_output.delete("\n"), actual_strict_output.delete("\n"))
-  end
-
-  # TESTING INCORRECT BEHAVIOUR OF LIQUID-RUBY
-  # If liquid-vm fails this test, we should change it.
-  def test_boolean_conditional_with_json_filter
-    # Define the Liquid template to test
-    template = <<~LIQUID
-      {{ template.name == 'index' | json }}
-    LIQUID
-
-    # Define the context for the template where the template name is 'index'
-    context = {
-      "template" => {
-        "name" => "product",
-      },
-    }
-
-    # Expected output
-    # Note: I dont know what is the correct output here but this is the liquid-ruby 'main' output.
-    #
-    # It feels incorrect but I dont know whats better
-    expected_output = "product"
-
-    # Render the template with the context
-    actual_parsed_template = Liquid::Template.parse(template)
-    actual_output = actual_parsed_template.render(context)
-
-    # Assert that the actual output matches the expected output
-    assert_equal(expected_output, actual_output.strip)
-  end
-
-  # TESTING INCORRECT BEHAVIOUR OF LIQUID-RUBY
-  # If liquid-vm fails this test, we should change it.
-  def test_chained_conditional_with_object_contains
-    # Define the Liquid template to test
-    template = <<~LIQUID
-      {{ settings.prefilter_status and template contains 'collection' }}
-    LIQUID
-
-    # Test with context containing 'collection'
-    context_with_collection = {
-      "template" => {
-        "name" => "collection",
-      },
-      "settings" => {
-        "prefilter_status" => true,
-      },
-    }
-    # NOTE: This is a bug that liquid-ruby `main` output returns the first value.
-    assert_with_lax_parsing(template, "true", context_with_collection)
-
-    # Test with context not containing 'collection'
-    context_without_collection = {
-      "template" => {
-        "name" => "not-collection",
-      },
-      "settings" => {
-        "prefilter_status" => true,
-      },
-    }
-    # NOTE: This is a bug that liquid-ruby `main` output returns the first value.
-    assert_with_lax_parsing(template, "true", context_without_collection)
-  end
-
-  # TESTING INCORRECT BEHAVIOUR OF LIQUID-RUBY
-  # If liquid-vm fails this test, we should change it.
-  def test_assign_boolean_expression_to_variable
-    template = <<~LIQUID
-      {%- liquid
-        assign is_preview_mode = content_for_header contains "foo" or content_for_header contains "bar"
-        echo is_preview_mode
-      -%}
-    LIQUID
-
-    context = { "content_for_header" => "Some content" }
-
-    # Expected output
-    # This value should be "false" but it is the value of the variable from the failed expression.
-    assert_template_result("Some content", template, context)
-
-    # This following validation should only be supported with our changes. It is the short-hand for the above template.
-    # The validation for it is the expected correct output.
-    template = Liquid::Template.parse("{% assign is_preview_mode = content_for_header contains 'foo' or content_for_header contains 'bar' %}{{ is_preview_mode }}")
-    assert_equal("false", template.render(context))
-  end
-
-  private
-
-  def assert_with_lax_parsing(template, expected_output, context = {})
-    prev_error_mode = Liquid::Environment.default.error_mode
-    Liquid::Environment.default.error_mode = :lax
-
-    begin
-      actual_output = Liquid::Template.parse(template).render(context)
-    rescue StandardError => e
-      actual_output = e.message
-    ensure
-      Liquid::Environment.default.error_mode = prev_error_mode
-    end
-
-    assert_equal(expected_output.strip, actual_output.strip)
-  end
-
-  def assert_parity(liquid_expression, expected_result, args = {})
-    assert_condition(liquid_expression, expected_result, args)
-    assert_expression(liquid_expression, expected_result, args)
-  end
-
-  def assert_expression(liquid_expression, expected_result, args = {})
-    assert_parity_scenario(:expression, "{{ #{liquid_expression} }}", expected_result, args)
-  end
-
-  def assert_condition(liquid_condition, expected_result, args = {})
-    assert_parity_scenario(:condition, "{% if #{liquid_condition} %}true{% else %}false{% endif %}", expected_result, args)
-  end
-
-  def assert_parity_scenario(kind, template, exp_output, args = {})
-    act_output = Liquid::Template.parse(template).render(args)
-
-    assert_equal(exp_output, act_output, <<~ERROR_MESSAGE)
-      #{kind.to_s.capitalize} template failure:
-      ---
-      #{template}
-      ---
-      args: #{args.inspect}
-    ERROR_MESSAGE
-  end
-
-  class LinkDrop < Liquid::Drop
-    attr_accessor :levels, :links, :title, :type, :url
-
-    def initialize(levels: nil, links: nil, title: nil, type: nil, url: nil)
-      super()
-
-      @levels = levels
-      @links = links
-      @title = title
-      @type = type
-      @url = url
-    end
-  end
-end

test/unit/lexer_unit_test.rb

@@ -141,78 +141,6 @@ class LexerUnitTest < Minitest::Test
     )
   end
 
-  def test_boolean_and_operator
-    exp = [
-      [:id, "true"],
-      [:boolean_operator, "and"],
-      [:id, "false"],
-      [:end_of_string],
-    ]
-    act = tokenize("true and false")
-    assert_equal(exp, act)
-  end
-
-  def test_boolean_or_operator
-    exp = [
-      [:id, "false"],
-      [:boolean_operator, "or"],
-      [:id, "true"],
-      [:end_of_string],
-    ]
-    act = tokenize("false or true")
-    assert_equal(exp, act)
-  end
-
-  def test_boolean_operators_in_complex_expressions
-    exp = [
-      [:id, "a"],
-      [:boolean_operator, "and"],
-      [:id, "b"],
-      [:boolean_operator, "or"],
-      [:id, "c"],
-      [:end_of_string],
-    ]
-    act = tokenize("a and b or c")
-    assert_equal(exp, act)
-  end
-
-  def test_boolean_operators_with_comparisons
-    exp = [
-      [:id, "a"],
-      [:comparison, ">"],
-      [:number, "5"],
-      [:boolean_operator, "and"],
-      [:id, "b"],
-      [:comparison, "<"],
-      [:number, "10"],
-      [:end_of_string],
-    ]
-    act = tokenize("a > 5 and b < 10")
-    assert_equal(exp, act)
-  end
-
-  def test_boolean_operators_as_property_names
-    exp = [
-      [:id, "obj"],
-      [:dot, "."],
-      [:id, "and"],
-      [:dot, "."],
-      [:id, "property"],
-      [:end_of_string],
-    ]
-    act = tokenize("obj.and.property")
-    assert_equal(exp, act)
-
-    exp = [
-      [:id, "obj"],
-      [:dot, "."],
-      [:id, "or"],
-      [:end_of_string],
-    ]
-    act = tokenize("obj.or")
-    assert_equal(exp, act)
-  end
-
   private
 
   def tokenize(input)