How to approach modifying source code programmatically?

• semgrep

  9 9,660 9.9 OCaml

  Lightweight static analysis for many languages. Find bug variants with patterns that look like source code.

  

  I would probably start by seeing if I can use an existing tool to handle this for me. For example, I like using Comby and sometimes Semgrep for this sort of thing.

• LibCST

  1 1,405 8.6 Python

  A concrete syntax tree parser and serializer library for Python that preserves many aspects of Python's abstract syntax tree

  

  While you can do this using ANTLR or any other lexing/parsing tool, it's honestly a bit of a pain. Whitespace and comments can go almost anywhere, even in the middle of expressions, so the grammar ends up becoming fairly messy. So, I'd recommend using a library that handles this for you, if at all possible. For example, if I wanted to code-mod Python I'd prob just use the LibCST library.

• WorkOS

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