/usr/lib/ruby/vendor_ruby/treetop/compiler/node_classes/character_class.rb is in ruby-treetop 1.6.8-1.
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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | module Treetop
module Compiler
class CharacterClass < AtomicExpression
def compile(address, builder, parent_expression = nil)
super
builder.if__ "has_terminal?(@regexps[gr = #{grounded_regexp(text_value)}] ||= Regexp.new(gr), :regexp, index)" do
if address == 0 || decorated?
assign_result "instantiate_node(#{node_class_name},input, index...(index + 1))"
extend_result_with_inline_module parent_expression
else
assign_lazily_instantiated_node
end
builder << "@index += 1" # Always one character
end
builder.else_ do
builder << "terminal_parse_failure(#{expected})"
assign_result 'nil'
end
end
def expected
single_quote('['+characters+']')
end
def inline_module
nil
end
def grounded_regexp(string)
# Double any backslashes, then backslash any single-quotes:
"'\\A#{string.gsub(/\\/) { '\\\\' }.gsub(/'/) { "\\'"}}'"
end
end
end
end
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