Added a new example showcasing a recursive parser for parsing advance… #549
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…d mathematical expressions in infix notation. The parser supports binary, unary, and variadic operators that can be customized by modifying the class variables. It therefore goes way beyond any existing examples for artithmetic expression parsers. It also showcases how regex can be utilized to improve the performance of a parser written utilzing pyparsing. I wrote this parser for another project, where it was needed. I could not find a ready-made parser for my purposes in the examples, or the web in general. Therefore, I am making this pull request in hopes it gets accepted and hopefully lessens the burden of some other future user, who might have a similar need for a parser as I did. I left comments in the code that I made for myself when learning the library. I believe they add to the example, and therefore left them there.
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Looking over your parser this weekend, thanks for submitting it. In the meantime, please look at the plusminus package (https://github.com/pyparsing/plusminus). This package might do much of what you want, plus add evaluation as well as parsing. |
Implemented minor fixes to infix_math_parser.py based on comments by @ptmcg.
Thanks, I wish I had found this before, might have been useful! As for the other comments, I have addressed them and updated the PR. I always appreciate someone going over code I have written and giving feedback, especially with this level of care. Thanks! The diffs are somehow messed up in the PR. I should check my IDE settings. Sorry for this. I would be happy if this example is included in pyparsing, but if its contribution to the framework is not enough to warrant a pull, that is fine as well. |
…d mathematical expressions in infix notation.
The parser supports binary, unary, and variadic operators that can be customized by modifying the class variables. It therefore goes way beyond any existing examples for artithmetic expression parsers. It also showcases how regex can be utilized to improve the performance of a parser written utilzing pyparsing.
I wrote this parser for another project, where it was needed. I could not find a ready-made parser for my purposes in the examples, or the web in general. Therefore, I am making this pull request in hopes it gets accepted and hopefully lessens the burden of some other future user, who might have a similar need for a parser as I did. I left comments in the code that I made for myself when learning the library. I believe they add to the example, and therefore left them there.