How do I use the rustc parser (libsyntax)?

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rustc 0.13.0-nightly (f168c12c5 2014-10-25 20:57:10 +0000)

I want to use the rust parser (libsyntax) to parse a rust file and extract information like function names etc. out of it. I just started digging in the docs and code, so my first goal is a program that prints all function names of freestanding functions in a .rs file.

The program should expand all macros before it prints the function names, so functions declared via macro aren't missed. That's why I can't write some crappy little parser by myself to do the job.

I have to admit that I'm not perfectly good at programming rust (yet), so I apologize in advance for any stupid statements in this question.

How I understood it I need to do the following steps:

1. Parse the file via the Parser struct


2. Expand macros with MacroExpander


3. ???


4. Use a Visitor to walk the AST and extract the information I need (eg. via #visit_fn)

So here are my questions:

1. How do I use MacroExpander?


2. How do I walk the expanded AST with a custom visitor?

I hope my question is well-understandable and not too broad. I will edit/split it if requested.

asked 1 min ago

le_me

185

How do I use the rustc parser (libsyntax)?