JezK
Edit File: optional.rb
module Treetop module Compiler class Optional < ParsingExpression def compile(address, builder, parent_expression) super use_vars :result obtain_new_subexpression_address parent_expression.atomic.compile(subexpression_address, builder) builder.if__ subexpression_success? do assign_result subexpression_result_var end builder.else_ do assign_result epsilon_node end end end end end