micheleandCursor
edbb47a08b
Skip the model (and the credit gate) when LCSC/DigiKey already list C/V/Z, when the BOM value is a single R/C/L/FB token, or when the MPN is an LQW18AN inductor. Ferrite beads keep impedance, not invented henries; value-only specs stay out of the shared library. Co-authored-by: Cursor <cursoragent@cursor.com>
120 lines
3.7 KiB
Python
120 lines
3.7 KiB
Python
"""Parse a BOM Value string into typed passive specs without an LLM."""
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from __future__ import annotations
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import re
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from backend.pinscopex.models import ComponentModel, SimpleComponentSpecs
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from backend.pinscopex.resolve_passives import simple_to_typed_passive_specs
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from backend.services.passive_from_distributor import _spice
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_PLACEHOLDER = re.compile(
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r"^(?:dnp|dni|dns|nc|n/?c|n/?a|np|nfs|tbd|todo|jumper|jmp|short|open|-|—|–)$",
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re.I,
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)
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_CAP = re.compile(
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r"^(?P<num>\d+(?:\.\d+)?)\s*(?P<mul>[pnuμµmk])?\s*[fF]$",
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)
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_IND = re.compile(
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r"^(?P<num>\d+(?:\.\d+)?)\s*(?P<mul>[pnuμµmk])?\s*H$",
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re.I,
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)
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_RES_UNIT = re.compile(
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r"^(?P<num>\d+(?:\.\d+)?)\s*(?P<mul>[pnuμµmkM])?\s*(?:ohms?|Ω|R)$",
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re.I,
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)
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_RES_BARE_MUL = re.compile(
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r"^(?P<num>\d+(?:\.\d+)?)(?P<mul>[kKmM])$",
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)
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_EURO_R = re.compile(
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r"^(?P<a>\d+)[kK](?P<b>\d+)$",
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)
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_FB = re.compile(
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r"^(?P<num>\d+(?:\.\d+)?)\s*(?P<mul>[kKmM])?\s*(?:ohms?|Ω|R)"
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r"(?:@\s*(?P<freq>\d+(?:\.\d+)?\s*(?:kHz|MHz|GHz|Hz)))?$",
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re.I,
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)
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def is_placeholder_value(value: str) -> bool:
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return bool(_PLACEHOLDER.match((value or "").strip()))
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def _model(mpn: str, subtype: str, values: dict[str, str]) -> ComponentModel | None:
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specs = SimpleComponentSpecs(
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specs_type="passive",
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component_subtype=subtype,
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values=values,
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)
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try:
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typed = simple_to_typed_passive_specs(specs)
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except (ValueError, TypeError):
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return None
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return ComponentModel(mpn=mpn, specs=typed)
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def specs_from_bom_value(
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mpn: str, value: str, ref_prefix: str,
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) -> ComponentModel | None:
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"""Map ``18pF`` / ``4.7k`` / ``10uH`` / ``600R@100MHz`` to typed specs.
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Returns None for placeholders (DNP, NC, JUMPER) and for strings that
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are not a single passive value. Callers must not save the result to the
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shared library.
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"""
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raw = (value or "").strip()
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prefix = (ref_prefix or "").upper()
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if not raw or is_placeholder_value(raw):
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return None
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compact = re.sub(r"\s+", "", raw)
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if prefix == "FB" or "@" in compact:
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m = _FB.match(compact) or _FB.match(raw)
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if m:
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z = _spice(m.group("num"), m.group("mul"), "ohm")
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freq = re.sub(r"\s+", "", m.group("freq") or "")
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values = {
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"impedance_ohm": z,
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"value_formatted": f"{z}@{freq}" if freq else z,
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}
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return _model(mpn, "passive.ferrite_bead", values)
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if prefix in {"C", ""}:
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m = _CAP.match(compact) or _CAP.match(raw)
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if m:
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farads = _spice(m.group("num"), m.group("mul"), "F")
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return _model(mpn, "passive.capacitor", {
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"value_farads": farads,
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"value_formatted": farads,
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})
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if prefix in {"L", ""}:
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m = _IND.match(compact) or _IND.match(raw)
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if m:
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henries = _spice(m.group("num"), m.group("mul"), "H")
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return _model(mpn, "passive.inductor", {
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"value_henries": henries,
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"value_formatted": henries,
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})
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if prefix in {"R", ""}:
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m = _EURO_R.match(compact)
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if m:
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ohms = float(f"{m.group('a')}.{m.group('b')}") * 1e3
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formatted = _spice(str(ohms), None, "ohm")
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return _model(mpn, "passive.resistor", {
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"value_ohms": formatted,
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"value_formatted": formatted,
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})
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m = _RES_UNIT.match(compact) or _RES_BARE_MUL.match(compact)
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if m:
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formatted = _spice(m.group("num"), m.group("mul"), "ohm")
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return _model(mpn, "passive.resistor", {
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"value_ohms": formatted,
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"value_formatted": formatted,
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})
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return None
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