Allow ERB subclass to add token easily
While I want to use ERB in Rails, escape token "<%==" is not available in ERB and we can't add a new token to ERB easily.
To allow ERB subclass to add a new token easily, I splitted ERB::Compiler#compile to some small methods and created ERB::Compiler::Scanner#stags and ERB::Compiler::Scanner#etags.
With this patch, we'll be able to add a new stag or etag by overriding these methods.
sample.rb is a sample to create ERB subclass with "<%==" token.
Allow ERB subclass to add token easily. [Feature #11936]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53412 b2dd03c8-39d4-4d8f-98ff-823fe69b080e