lexilla-py: Python bindings for Lexilla

CI PyPI License: MIT Python versions

Permissively-licensed Python bindings for Lexilla, the lexer library for Scintilla.

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Status

See GitHub Issues for what's done and what's next.

Why this exists

Lexilla creates the lexer objects (ILexer5) that a Scintilla editor widget attaches via SCI_SETILEXER — it's a separate, Qt-free C++ library from Scintilla itself since Scintilla 5.0. This project exposes that library directly to Python. In practice, pyside6-scintilla is its only consumer, wired up via the set_lexer() convenience function (see Usage below) rather than raw SCI_SETILEXER pointer plumbing; it's kept as a separate package so this binding's release cadence and vendored Lexilla version can track upstream Lexilla releases independently of pyside6-scintilla's own release cycle — see docs/specs/mission.md for the full background.

Goals

lexilla aims to be:

  • MIT licensed — usable in open-source or closed-source projects freely
  • A faithful, low-level binding of Lexilla's CreateLexer/ILexer5 C++ API — not a redesign of it
  • Vendored and versioned independently of pyside6-scintilla — exposes the lexer as a raw pointer (SCI_SETILEXER-compatible), so this package can track upstream Lexilla releases on its own schedule
  • Available as pre-built wheels for Linux (x86_64, aarch64), Windows (x86_64), and macOS (arm64, x86_64)
  • Not affiliated with the Scintilla/Lexilla project

Installation

Install from PyPI:

pip install lexilla

Usage

from lexilla import Language, create_lexer
from lexilla.pyside6_scintilla import set_lexer
from pyside6_scintilla import ScintillaEdit

editor = ScintillaEdit()
lexer = create_lexer(Language.CPP)
assert lexer is not None
set_lexer(editor, lexer)

set_lexer() hands a created lexer to a pyside6-scintilla ScintillaEdit via SCI_SETILEXER, transferring ownership to it — see lexilla_highlighting for a complete example.

Versioning

Version numbers follow <Lexilla version>.<binding revision> — e.g. 5.5.0.0 is binding revision 0 for Lexilla 5.5.0. The binding revision increments for releases of this package that don't correspond to a new Lexilla version, and resets to 0 when Lexilla itself releases a new version.

Documentation

Doc Contents
docs/auditing.md How to verify the vendored Lexilla source matches upstream
docs/bindings.md How the nanobind bindings are built, and how they're expected to grow
docs/build.md Build prerequisites, local build/rebuild, wheels, and publishing
docs/documenting.md How the docs site is built (stub)
docs/specs/ Design specifications and action plans for in-progress and planned work
docs/specs/mission.md Project background, goals, and design decisions
docs/testpypi.md Setting up TestPyPI trusted publishing
examples/ No examples of its own — see pyside6-scintilla/examples/
GitHub Issues Ordered list of upcoming work
Project board Joint roadmap for lexilla-py and pyside6-scintilla; issues/PRs from both repos are auto-added

License

Project links

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Latest release

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Avatar for borco from gravatar.com borco

Credits

Author: Ioan Calin

GitHub Statistics

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License expression

MIT
View SPDX License List

Requires

Python >=3.11

Tags

scintilla lexilla lexer syntax-highlighting nanobind code-editor

Classifiers

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