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).
20 lines
1.1 KiB
Markdown
20 lines
1.1 KiB
Markdown
# DSN test fixtures
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Hand-crafted minimal Specctra DSN files, written to exercise the parser. They
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are modeled on the real fixtures shipped in the upstream FreeRouting repo
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(`fixtures/empty_board.dsn` and `fixtures/SMD-routing-issue-demo.dsn`) so the
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grammar and formatting match what `kicad-cli pcb export specctra-dsn` and
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FreeRouting itself produce, but they were typed fresh here (no upstream file is
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copied into this tree).
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- `empty_board.dsn` — the smallest valid board: parser, resolution, unit, and a
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structure with two signal layers and a `pcb` boundary path. Modeled on
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FreeRouting `fixtures/empty_board.dsn`.
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- `smd_demo.dsn` — a fuller board exercising every scope the parser handles:
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quoted board/padstack/image names, `via`, default `rule` (width + clearance
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with a `(type smd_smd)` pair), a `keepout`, padstacks (rect and circle pads),
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images with pins, placement with `front`/rotation, nets with `Comp-Pin`
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references, and a `class` with `circuit`/`use_via` and a `rule`. Modeled on
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FreeRouting `fixtures/SMD-routing-issue-demo.dsn`.
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</content>
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