/usr/lib/ruby/vendor_ruby/treetop/compiler/node_classes/optional.rb is in ruby-treetop 1.4.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | 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
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