module Bridgetown::Filters::ConditionHelpers
Public Instance Methods
parse_binary_comparison(parser)
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Generate a Liquid::Condition object from a Liquid::Parser object additionally processing the parsed expression based on whether the expression consists of binary operations with Liquid operators `and` or `or`
- parser: an instance of Liquid::Parser
Returns an instance of Liquid::Condition
# File lib/bridgetown-core/filters/condition_helpers.rb, line 25 def parse_binary_comparison(parser) condition = parse_comparison(parser) first_condition = condition while (binary_operator = parser.id?("and") || parser.id?("or")) child_condition = parse_comparison(parser) condition.send(binary_operator, child_condition) condition = child_condition end first_condition end
parse_comparison(parser)
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Generates a Liquid::Condition object from a Liquid::Parser object based on whether the parsed expression involves a “comparison” operator (e.g. <, ==, >, !=, etc)
- parser: an instance of Liquid::Parser
Returns an instance of Liquid::Condition
# File lib/bridgetown-core/filters/condition_helpers.rb, line 43 def parse_comparison(parser) left_operand = Liquid::Expression.parse(parser.expression) operator = parser.consume?(:comparison) # No comparison-operator detected. Initialize a Liquid::Condition using only left operand return Liquid::Condition.new(left_operand) unless operator # Parse what remained after extracting the left operand and the `:comparison` operator # and initialize a Liquid::Condition object using the operands and the comparison-operator Liquid::Condition.new(left_operand, operator, Liquid::Expression.parse(parser.expression)) end
parse_condition(exp)
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Parse a string to a Liquid Condition
# File lib/bridgetown-core/filters/condition_helpers.rb, line 10 def parse_condition(exp) parser = Liquid::Parser.new(exp) condition = parse_binary_comparison(parser) parser.consume(:end_of_string) condition end