#2 add line numbering to HtmlCleaner

[Chad Loder]

The following patch implements line numbering in HtmlCleaner and uses the setUserData/getUserData methods of org.w3c.dom.Node to ensure that line numbers are available within DOM trees (as Integer userdata).

This patch is hereby transferred released under the BSD license.

Some comments: Instead of having 4 separate Integer user data properties, one could have a single HtmlCleaner-specific DocumentLocation object, but this may not be desirable.

We considered also inserting some org.w3c.dom.ProcessorInstruction nodes into the DOM tree but decided that this was much less elegant.

[Chad Loder]

the diff

[Chad Loder]

Two new files which go with the patch

[Chad Loder]

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File Added: linenums_newfiles.diff