Ryan Malloy
3bf4f6bed2
Ports the read path of FreeRouting's io/specctra/parser package to a Java-free Python implementation: - tokenizer: S-expression lexer mirroring SpecctraFileDescription.flex (comments, quoted strings, the string_quote IGNORE_QUOTE directive, case-insensitive keywords, and hash-prefixed names) - sexp: nested S-expression tree builder - shapes: rect/circle/polygon/path plus area-with-holes scopes - model: typed dataclasses for layers, padstacks, images, placements, nets, net classes, rules, keepouts - reader: recursive-descent scope readers producing a DsnBoard, one _read_* function per FreeRouting read_scope method 46 pytest cases cover the tokenizer, tree, shapes, and end-to-end parsing against hand-crafted fixtures modeled on FreeRouting's own test DSN files. Parses 90 of 91 upstream fixtures (the one failure is a binary OLE file, not text DSN).
61 lines
1.6 KiB
Python
61 lines
1.6 KiB
Python
"""Tests for the S-expression tree parser."""
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from __future__ import annotations
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import pytest
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from freeroute.dsn.sexp import SExp, parse
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from freeroute.dsn.tokenizer import DsnSyntaxError, Token
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def test_parse_simple_head_and_values():
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tree = parse("(resolution um 10)")
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assert tree.head == "resolution"
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vals = tree.values()
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assert [v.text for v in vals] == ["um", "10"]
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def test_nested_children():
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tree = parse("(structure (layer Top (type signal)) (layer Bot (type signal)))")
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assert tree.head == "structure"
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layers = tree.children("layer")
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assert len(layers) == 2
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assert isinstance(layers[0], SExp)
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assert layers[0].values()[0].text == "Top"
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type_scope = layers[0].child("type")
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assert type_scope is not None
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assert type_scope.values()[0].text == "signal"
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def test_child_missing_returns_none():
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tree = parse("(a (b 1))")
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assert tree.child("nope") is None
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def test_values_skips_nested_lists():
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tree = parse("(net NET_A (pins U1-1 R2-2))")
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assert [v.text for v in tree.values()] == ["NET_A"]
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pins = tree.child("pins")
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assert pins is not None
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assert [v.text for v in pins.values()] == ["U1-1", "R2-2"]
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def test_leaf_items_are_tokens():
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tree = parse("(a 1 2)")
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assert all(isinstance(it, Token) for it in tree.items)
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def test_unbalanced_raises():
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with pytest.raises(DsnSyntaxError):
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parse("(a (b )")
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def test_trailing_token_raises():
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with pytest.raises(DsnSyntaxError):
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parse("(a) (b)")
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def test_no_toplevel_list_raises():
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with pytest.raises(DsnSyntaxError):
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parse("just atoms no parens")
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