/usr/share/doc/ruby1.8-examples/examples/exyacc.rb is in ruby1.8-examples 1.8.7.352-2ubuntu1.6.
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 | #! /usr/local/bin/ruby -Kn
# usage: exyacc.rb [yaccfiles]
# this is coverted from exyacc.pl in the camel book
$/ = nil
while gets()
sbeg = $_.index("\n%%") + 1
send = $_.rindex("\n%%") + 1
$_ = $_[sbeg, send-sbeg]
sub!(/.*\n/, "")
gsub!(/'\{'/, "'\001'")
gsub!(/'\}'/, "'\002'")
gsub!(%r{\*/}, "\003\003")
gsub!(%r{/\*[^\003]*\003\003}, '')
while gsub!(/\{[^{}]*\}/, ''); end
gsub!(/'\001'/, "'{'")
gsub!(/'\002'/, "'}'")
while gsub!(/^[ \t]*\n(\s)/, '\1'); end
gsub!(/([:|])[ \t\n]+(\w)/, '\1 \2')
print $_
end
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