From 6b782914499fb918dbb89fae013a14a50672b2dc Mon Sep 17 00:00:00 2001
From: "Charles-P. Clermont" <charles@cpclermont.com>
Date: Tue, 2 Dec 2025 12:08:06 -0500
Subject: [PATCH] Rename Parser#expression -> Parser#expression_string

---
 lib/liquid/condition.rb       |  2 +-
 lib/liquid/expression.rb      |  2 +-
 lib/liquid/parser.rb          | 57 +++++++++++++++++------------------
 lib/liquid/tags/for.rb        |  4 +--
 test/unit/parser_unit_test.rb | 24 +++++++--------
 5 files changed, 44 insertions(+), 45 deletions(-)

diff --git a/lib/liquid/condition.rb b/lib/liquid/condition.rb
index bd9b775d..e0f527eb 100644
--- a/lib/liquid/condition.rb
+++ b/lib/liquid/condition.rb
@@ -49,7 +49,7 @@ module Liquid
     end
 
     def self.parse_expression(parser)
-      markup = parser.expression
+      markup = parser.expression_string
       @@method_literals[markup] || parser.unsafe_parse_expression(markup)
     end
 
diff --git a/lib/liquid/expression.rb b/lib/liquid/expression.rb
index a6644a5f..175231be 100644
--- a/lib/liquid/expression.rb
+++ b/lib/liquid/expression.rb
@@ -26,7 +26,7 @@ module Liquid
 
     class << self
       def safe_parse(parser, ss = StringScanner.new(""), cache = nil)
-        parse(parser.expression, ss, cache)
+        parse(parser.expression_string, ss, cache)
       end
 
       def parse(markup, ss = StringScanner.new(""), cache = nil)
diff --git a/lib/liquid/parser.rb b/lib/liquid/parser.rb
index 60664407..881a24a3 100644
--- a/lib/liquid/parser.rb
+++ b/lib/liquid/parser.rb
@@ -47,34 +47,8 @@ module Liquid
       tok[0] == type
     end
 
-    def expression
-      token = @tokens[@p]
-      case token[0]
-      when :id
-        str = consume
-        str << variable_lookups
-      when :open_square
-        str = consume.dup
-        str << expression
-        str << consume(:close_square)
-        str << variable_lookups
-      when :string, :number
-        consume
-      when :open_round
-        consume
-        first = expression
-        consume(:dotdot)
-        last = expression
-        consume(:close_round)
-        "(#{first}..#{last})"
-      else
-        raise SyntaxError, "#{token} is not a valid expression"
-      end
-    end
-
-
     def expression_node
-      parse_expression(expression)
+      parse_expression(expression_string)
     end
 
     def argument
@@ -84,7 +58,7 @@ module Liquid
         str << consume << consume << ' '
       end
 
-      str << expression
+      str << expression_string
       str
     end
 
@@ -93,7 +67,7 @@ module Liquid
       loop do
         if look(:open_square)
           str << consume
-          str << expression
+          str << expression_string
           str << consume(:close_square)
         elsif look(:dot)
           str << consume
@@ -105,6 +79,31 @@ module Liquid
       str
     end
 
+    def expression_string
+      token = @tokens[@p]
+      case token[0]
+      when :id
+        str = consume
+        str << variable_lookups
+      when :open_square
+        str = consume.dup
+        str << expression_string
+        str << consume(:close_square)
+        str << variable_lookups
+      when :string, :number
+        consume
+      when :open_round
+        consume
+        first = expression_string
+        consume(:dotdot)
+        last = expression_string
+        consume(:close_round)
+        "(#{first}..#{last})"
+      else
+        raise SyntaxError, "#{token} is not a valid expression"
+      end
+    end
+
     # Assumes safe input. For cases where you need the string.
     # Don't use this unless you're sure about what you're doing.
     def unsafe_parse_expression(markup)
diff --git a/lib/liquid/tags/for.rb b/lib/liquid/tags/for.rb
index ae507c25..3e23b2a1 100644
--- a/lib/liquid/tags/for.rb
+++ b/lib/liquid/tags/for.rb
@@ -75,7 +75,7 @@ module Liquid
       @variable_name = p.consume(:id)
       raise SyntaxError, options[:locale].t("errors.syntax.for_invalid_in") unless p.id?('in')
 
-      collection_name  = p.expression
+      collection_name  = p.expression_string
       @collection_name = p.unsafe_parse_expression(collection_name)
 
       @name     = "#{@variable_name}-#{collection_name}"
@@ -158,7 +158,7 @@ module Liquid
     end
 
     def set_attribute(key, p)
-      expr = p.expression
+      expr = p.expression_string
       case key
       when 'offset'
         @from = if expr == 'continue'
diff --git a/test/unit/parser_unit_test.rb b/test/unit/parser_unit_test.rb
index 2c6a3594..453c10f8 100644
--- a/test/unit/parser_unit_test.rb
+++ b/test/unit/parser_unit_test.rb
@@ -47,23 +47,23 @@ class ParserUnitTest < Minitest::Test
 
   def test_expressions
     p = new_parser("hi.there hi?[5].there? hi.there.bob")
-    assert_equal('hi.there', p.expression)
-    assert_equal('hi?[5].there?', p.expression)
-    assert_equal('hi.there.bob', p.expression)
+    assert_equal('hi.there', p.expression_string)
+    assert_equal('hi?[5].there?', p.expression_string)
+    assert_equal('hi.there.bob', p.expression_string)
 
     p = new_parser("567 6.0 'lol' \"wut\"")
-    assert_equal('567', p.expression)
-    assert_equal('6.0', p.expression)
-    assert_equal("'lol'", p.expression)
-    assert_equal('"wut"', p.expression)
+    assert_equal('567', p.expression_string)
+    assert_equal('6.0', p.expression_string)
+    assert_equal("'lol'", p.expression_string)
+    assert_equal('"wut"', p.expression_string)
   end
 
   def test_ranges
     p = new_parser("(5..7) (1.5..9.6) (young..old) (hi[5].wat..old)")
-    assert_equal('(5..7)', p.expression)
-    assert_equal('(1.5..9.6)', p.expression)
-    assert_equal('(young..old)', p.expression)
-    assert_equal('(hi[5].wat..old)', p.expression)
+    assert_equal('(5..7)', p.expression_string)
+    assert_equal('(1.5..9.6)', p.expression_string)
+    assert_equal('(young..old)', p.expression_string)
+    assert_equal('(hi[5].wat..old)', p.expression_string)
   end
 
   def test_arguments
@@ -78,7 +78,7 @@ class ParserUnitTest < Minitest::Test
   def test_invalid_expression
     assert_raises(SyntaxError) do
       p = new_parser("==")
-      p.expression
+      p.expression_string
     end
   end