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#! /usr/local/bin/ruby -Kn
# usage: exyacc.rb [yaccfiles]
# this is covered from exyacc.pl in the camel book
ARGF.each(nil) do |source|
sbeg = source.index("\n%%") + 1
send = source.rindex("\n%%") + 1
grammar = source[sbeg, send-sbeg]
grammar.sub!(/.*\n/, "")
grammar.gsub!(/'\{'/, "'\001'")
grammar.gsub!(/'\}'/, "'\002'")
grammar.gsub!(%r{\*/}, "\003\003")
grammar.gsub!(%r{/\*[^\003]*\003\003}, '')
while grammar.gsub!(/\{[^{}]*\}/, ''); end
grammar.gsub!(/'\001'/, "'{'")
grammar.gsub!(/'\002'/, "'}'")
while grammar.gsub!(/^[ \t]*\n(\s)/, '\1'); end
grammar.gsub!(/([:|])[ \t\n]+(\w)/, '\1 \2')
print grammar
end
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