cshape

A dependency-free C AST + printer for Python: build a tree and get C11 source back. No parsing, no dependencies beyond the standard library — just CType* / CValue* / CStmt* nodes and a render() function that turns them into text.

Originally the C backend's printer for the Modest compiler, split out because it doesn't know anything about Modest — it only knows about C.

Install

pip install cshape

Example

from cshape import *

func = CStmtDefFunc(
	id="add",
	type=CTypeFunction(
		params=[CField(id="a", type=CTypeIdentifier("int")),
		        CField(id="b", type=CTypeIdentifier("int"))],
		to=CTypeIdentifier("int"),
	),
	block=CStmtBlock([
		CStmtReturn(CValueAdd(CValueIdentifier("a"), CValueIdentifier("b"))),
	]),
)

print(render(func).strip())

int add(int a, int b) {
	return a + b;
}

(render() returns the node's own leading blank lines too — CStmtDefFunc starts with a blank line by default, so .strip() if you're printing a single node standalone rather than concatenating several.)

What it covers

  • Types: named types, pointers, arrays, function types, structs/unions, enums
  • Values: the full C11 expression grammar with correct operator precedence and parenthesization (including the extra parens GCC/Clang warn about for mixed bitwise/shift expressions)
  • Statements: blocks, if/while, return, break/continue, inline asm, raw inserts
  • Preprocessor: #define, #undef, #include, #if/#elif/#else/#endif regions
  • Two brace styles (legacy — K&R-ish, modern — Allman-ish), configurable via render(node, style=...)
  • A .mark field on every node: set it to any string and it shows up as a /*mark*/ comment right before that node in the output — useful for tracing which part of your own compiler/generator produced which bit of C

What it doesn't do

No parsing, no semantic analysis, no type checking. It's a printer, not a compiler frontend — you build the tree, it hands you back text.

License

MIT

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Newer release available (0.2.2)

1 maintainer

PyPI data
Data sourced directly from PyPI's database.
Avatar for alexbalan from gravatar.com alexbalan

Credits

Author: Alex Balan

License expression

MIT
View SPDX License List

Requires

Python >=3.8

Tags

c codegen code-generation ast transpiler compiler

Classifiers

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