added tag v1_9_0_4

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 20 insertions, 0 deletions

diff --git a/trunk/sample/exyacc.rb b/trunk/sample/exyacc.rb
new file mode 100644
index 0000000000..c96ebfd676
--- /dev/null
+++ b/trunk/sample/exyacc.rb
@@ -0,0 +1,20 @@
+#! /usr/local/bin/ruby -Kn
+# usage: exyacc.rb [yaccfiles]
+# this is coverted from exyacc.pl in the camel book
+
+ARGF.each(nil) do |source|
+  sbeg = source.index("\n%%") + 1
+  send = source.rindex("\n%%") + 1
+  grammer = source[sbeg, send-sbeg]
+  grammer.sub!(/.*\n/, "")
+  grammer.gsub!(/'\{'/, "'\001'")
+  grammer.gsub!(/'\}'/, "'\002'")
+  grammer.gsub!(%r{\*/}, "\003\003")
+  grammer.gsub!(%r{/\*[^\003]*\003\003}, '')
+  while grammer.gsub!(/\{[^{}]*\}/, ''); end
+  grammer.gsub!(/'\001'/, "'{'")
+  grammer.gsub!(/'\002'/, "'}'")
+  while grammer.gsub!(/^[ \t]*\n(\s)/, '\1'); end
+  grammer.gsub!(/([:|])[ \t\n]+(\w)/, '\1 \2')
+  print grammer
+end