circuitdk-lossless-sexpr
circuitdk-lossless-sexpr provides a small, lossless concrete syntax tree for S-expressions.
Parsing and rendering an unchanged document preserves its source text byte for byte, including
whitespace, comments, number formatting, and unknown syntax.
The distribution is maintained as part of CircuitDK, but the Python package can be used independently.
Installation
uv add circuitdk-lossless-sexpr
Usage
from lossless_sexpr import TextEdit, apply_edits, parse
source = '(property "Value" "10 k" (at 1 2))'
document = parse(source)
value = document.lists("property")[0].atom(2)
assert value is not None
updated = apply_edits(source, [TextEdit(value.span, '"47 k"')])
assert updated == '(property "Value" "47 k" (at 1 2))'
Overlapping edits are rejected, and parse errors include source locations. The library deliberately contains no KiCad or circuit-specific semantics.
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