PyReprism

PyReprism is a Python framework for source-code preprocessing. It lets you match, extract, count, and remove comments, strings, numbers, operators, keywords and other language-specific constructs across 145+ programming languages and file formats — through a small high-level API, a command-line tool, code metrics, ML-oriented normalization, and diff/pull-request analysis.

Highlights

One consistent API for every language: remove_* / extract_* / count_* / match_* for each construct, plus a lossless tokenize().
Code metrics (stats) and ML canonicalization (normalize) for clone/plagiarism detection and code-embedding pipelines.
Optional high-accuracy Pygments backend — with zero required dependencies by default.
Batch/corpus analysis and unified/git diff processing.
A pyreprism command-line tool (also python -m PyReprism).

Requirements

Python 3.8 or newer

Install

pip install PyReprism

For the higher-accuracy tokenizer backend:

pip install "PyReprism[accurate]"

Quick start

import PyReprism as pr

source = """
# a comment
x = 5 + 6
print(x)  # inline
"""

pr.remove_comments(source, lang="python")   # code without comments
pr.extract_comments(source, lang="python")  # ['# a comment', '# inline']
pr.count_comments(source, lang="python")     # 2

lang accepts a language name ("python"), a file extension (".py"), or a language class. Canonicalize code for machine learning, or measure it:

pr.normalize("total = price * 42", lang="python")   # 'VAR1 = VAR2 * 0'
pr.stats(source, lang="python").comment_to_code_ratio

Command line

pyreprism remove comments file.py
pyreprism scan myproject/ --csv          # aggregate code metrics over a tree
git diff | pyreprism diff --cosmetic     # flag comment/whitespace-only changes

Documentation

Full documentation, including the API reference and the list of supported languages, is available at https://pyreprism.readthedocs.io.

Source code

PyReprism is developed on GitHub at https://github.com/unlv-evol/PyReprism. To work on it locally:

git clone https://github.com/unlv-evol/PyReprism.git
cd PyReprism
python3 -m venv venv && source venv/bin/activate
pip install -e ".[dev]"
pytest

See CONTRIBUTING.md for contribution guidelines.

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