mirror of
https://github.com/Shopify/liquid.git
synced 2026-09-15 08:50:45 -07:00
Dylan Thacker-Smith
e20df18eca
It transforms liquid code to equivalently parsed code, that doesn't depend on lax parsing quirks. Note that this transformation can hide the intent of the original code, so it is best to review the changes, since removed syntax often would indicate a bug in the original liquid code.
89 lines
2.3 KiB
Ruby
89 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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module Liquid
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class RangeLookup
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def self.parse(start_markup, end_markup)
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start_obj = Expression.parse(start_markup)
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end_obj = Expression.parse(end_markup)
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if start_obj.respond_to?(:evaluate) || end_obj.respond_to?(:evaluate)
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new(start_obj, end_obj)
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else
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begin
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start_obj.to_i..end_obj.to_i
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rescue NoMethodError
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invalid_expr = start_markup unless start_obj.respond_to?(:to_i)
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invalid_expr ||= end_markup unless end_obj.respond_to?(:to_i)
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if invalid_expr
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raise Liquid::SyntaxError, "Invalid expression type '#{invalid_expr}' in range expression"
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end
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raise
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end
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end
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end
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def self.lax_migrate(start_markup, end_markup)
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new_start = Expression.lax_migrate(start_markup)
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new_end = Expression.lax_migrate(end_markup)
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# cast literals
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start_obj = Expression.parse(new_start)
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end_obj = Expression.parse(new_end)
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if start_obj.respond_to?(:evaluate) || end_obj.respond_to?(:evaluate)
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new_start = lax_migrate_range_expression(new_start, start_obj)
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new_end = lax_migrate_range_expression(new_end, end_obj)
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else
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new_start = start_obj.to_i.to_s unless start_obj.is_a?(Integer)
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new_end = end_obj.to_i.to_s unless end_obj.is_a?(Integer)
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end
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[new_start, new_end]
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end
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def self.lax_migrate_range_expression(markup, expression)
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return markup if expression.respond_to?(:evaluate)
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case expression
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when Integer
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markup
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when NilClass, String
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expression.to_i.to_s
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else
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Utils.to_integer(input).to_s
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end
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end
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attr_reader :start_obj, :end_obj
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def initialize(start_obj, end_obj)
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@start_obj = start_obj
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@end_obj = end_obj
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end
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def evaluate(context)
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start_int = to_integer(context.evaluate(@start_obj))
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end_int = to_integer(context.evaluate(@end_obj))
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start_int..end_int
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end
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private
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def to_integer(input)
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case input
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when Integer
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input
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when NilClass, String
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input.to_i
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else
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Utils.to_integer(input)
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end
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end
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class ParseTreeVisitor < Liquid::ParseTreeVisitor
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def children
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[@node.start_obj, @node.end_obj]
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end
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end
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end
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end
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