It makes heavy use of setting results names, so that the parsed tokens can be easily retrieved from the results as if they were named attributes. Paddy McCarthy. Your example with pyparsing was just what I was looking for. It also copes very nicely with newlines and spacing in the header file. Ian - It is just at this kind of one-off parsing job that I think pyparsing really shines.
I am sure that you could have accomplished this with regexp's, but a it would have taken at least a bit longer b it would have required more whitespace handline such as function decls that span linebreaks c it would have been trickier to add other unanticipated changes support for other arg data types such as char, long , embedded comments, etc. BTW, all it takes to make this grammar comment-immune is to add the following statement before calling scanString : functionCall.
Adding this will properly handle i. Miki Tebeka. This discussion thread is closed Start new discussion. Similar topics Python. Parsing environment variables in ConfigParser files.
Python "header" files. Choosing the right parser for parsing C headers. C parsing fun. Problem with parsing email message with extraneous MIME information. Mobile Development. Add a comment. Active Oldest Votes. Improve this answer. Eli Bendersky k 83 83 gold badges silver badges bronze badges. Matt Anderson Matt Anderson While ostensibly ancient history, this answer deserves at least 2 more up votes -- it provides the ability to do exactly what the original post requests.
You can also write your own parser using any of these tools: pyparsing ply lepl and a lot more Brunisboy 91 17 17 bronze badges. Vijay Mathew Vijay Mathew Great references: I didn't know about a bunch of those modules. I'd like to know how full-featured they are compared to pygccxml which clearly has a leg-up since it's backed by GCC.
Depends on pyparsing and, as far as I understand, it is pure python. Davide Davide 1 1 silver badge 4 4 bronze badges. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses. See the FAQ for more details. For reporting problems with pycparser or submitting feature requests, please open an issue , or submit a pull request.
Note that pycparser and PLY uses docstrings for grammar specifications. Python installations that strip docstrings such as when using the Python -OO option will fail to instantiate and use pycparser. Installing pycparser is very simple. Once you download and unzip the package, you just have to execute the standard python setup. The setup script will then place the pycparser module into site-packages in your Python's installation library.
In order to be compilable, C code must be preprocessed by the C preprocessor - cpp. For all but the most trivial snippets of C code pycparser , like a C compiler, must receive preprocessed C code in order to function correctly. Note also that you can use gcc -E or clang -E instead of cpp. Windows users can download and install a binary build of Clang for Windows from this website. C code almost always include s various header files from the standard C library, like stdio.
These are standard C header files that contain only the bare necessities to allow valid parsing of the files that use them. As a bonus, since they're minimal, it can significantly improve the performance of parsing large C files. The key point to understand here is that pycparser doesn't really care about the semantics of types. It only needs to know whether some token encountered in the source is a previously defined type.
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