0.0.1

Full Changelog: 0.0.0...0.0.1

0.0.0

PySwiftAST v0.0.0 — Initial Release

A Python 3.13 AST parser and code generator written in pure Swift. Parse Python code without requiring a Python runtime.

Highlights

• Complete Python 3.13 syntax coverage — all statements, expressions, operators, literals, pattern matching (3.10+), type parameters (3.12+), and async/await
• Pure Swift — no Python interpreter required; works anywhere Swift runs (macOS, Linux, iOS)
• Thread-safe — all AST types conform to Sendable

Libraries Included

Library	Description
PySwiftAST	Tokenizer, recursive-descent parser, and full AST node definitions (28 modular files)
PySwiftCodeGen	Generate Python source code from an AST with round-trip support
PyFormatters	Code formatting utilities (Black-style, YAPF-style)
PyChecking	Type checking and static analysis
PyAstVisitors	AST visitor / walker infrastructure

Parser Features

• Tokenizer — 130+ token types, indentation-aware (INDENT/DEDENT), all string literal kinds (raw, f-strings, triple-quoted, bytes), all number formats
• Parser — 3,200+ line recursive-descent parser with operator-precedence climbing, error recovery, and full comprehension / pattern-matching support
• Code Generator — AST to Python source with proper indentation; enables parse, generate, re-parse round-trips

Performance

• 5.4x faster tokenization than CPython
• 1.17x faster parsing than CPython
• 2.93x faster round-trip (parse, codegen, reparse)

Requirements

• Swift 6.1+ (swift-tools-version 6.1)
• Dependency: swift-algorithms >= 1.2.0

Installation

Add to your Package.swift:

dependencies: [
    .package(url: "https://github.com/Py-Swift/PySwiftAST.git", from: "0.0.0"),
]

Quick Example

import PySwiftAST

let source = """
def greet(name: str) -> str:
    return f"Hello {name}"
"""

let ast = try parsePython(source)

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This is the initial public release (v0.0.0). APIs may evolve in future versions.