Template languages / rhtml support sources question

I am looking in the sources of ruby plugin, where they do their magic passes with hands and rhtml is supported.
Currently i have an error because classes
com.intellij.psi.impl.source.jsp.TreePatcher and
com.intellij.psi.impl.source.jsp.SimpleTreePatcher are missing.

Their location as well as some documentation on inplementing general template language is very welcome!

I've downloaded build 6913 and it's dev-kit.

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