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# frozen_string_literal: true
module Regexp::Expression
class Subexpression < Regexp::Expression::Base
include Enumerable
attr_accessor :expressions
def initialize(token, options = {})
self.expressions = []
super
end
# Override base method to clone the expressions as well.
def initialize_copy(orig)
self.expressions = orig.expressions.map do |exp|
exp.clone.tap { |copy| copy.parent = self }
end
super
end
def <<(exp)
exp.parent = self
expressions << exp
end
%w[[] at each empty? fetch index join last length values_at].each do |method|
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{method}(*args, &block)
expressions.#{method}(*args, &block)
end
RUBY
end
def dig(*indices)
exp = self
indices.each { |idx| exp = exp.nil? || exp.terminal? ? nil : exp[idx] }
exp
end
def te
ts + base_length
end
def to_h
attributes.merge(
text: to_s(:base),
expressions: expressions.map(&:to_h)
)
end
def extract_quantifier_target(quantifier_description)
pre_quantifier_decorations = []
target = expressions.reverse.find do |exp|
if exp.decorative?
exp.custom_to_s_handling = true
pre_quantifier_decorations << exp.text
next
end
exp
end
target or raise Regexp::Parser::ParserError,
"No valid target found for '#{quantifier_description}' quantifier"
target.pre_quantifier_decorations = pre_quantifier_decorations
target
end
end
end
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