Hi all,

I'm the author of protoc-gen-doc, a documentation generator plugin for 
protoc.

I need to be able to get the full (on disk) path of an input file, but 
can't find a way to do so.

The reason I need it is that I need to be able to open the file to do some 
custom parsing of the raw file contents (the info in the descriptors is not 
enough for this particular thing I need to do).

FileDescriptor::name will give me the path relative to the source tree, but 
I can't find a way to get the corresponding SourceTree instance used by the 
compiler, so that I can use e.g. SourceTree::VirtualFileToDiskFile to 
resolve the full path.

Am I stuck completely here? Thankful for any tips.

Cheers,
Elvis

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