79 lines
2.9 KiB
Python
79 lines
2.9 KiB
Python
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import codecs
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import os
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import re
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from typing import Optional, Union
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SYMBOLS_FILE: str = os.path.join(os.path.dirname(os.path.realpath(__file__)), "unimathsymbols.txt")
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SYMBOLS: Optional[dict[str, str]] = None
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def convert_symbol(symbol: str) -> Union[str, None]:
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global SYMBOLS
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if not SYMBOLS:
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SYMBOLS = parse_symbols()
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return SYMBOLS.get(symbol, None)
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def parse_symbols() -> dict[str, str]:
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_symbols: dict[str, str] = {}
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with codecs.open(SYMBOLS_FILE, encoding="utf-8") as f:
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for line in f:
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if line.startswith("#"):
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continue
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columns = line.strip().split("^")
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_unicode = columns[0]
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latex = columns[2]
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unicode_math = columns[3]
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if latex and latex not in _symbols:
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_symbols[latex] = _unicode
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if unicode_math and unicode_math not in _symbols:
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_symbols[unicode_math] = _unicode
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for equivalent in re.findall(r"[=#]\s*(\\[^,^ ]+),?", columns[-1]):
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if equivalent not in _symbols:
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_symbols[equivalent] = _unicode
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_symbols.update(
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{
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r"\And": _symbols[r"\ampersand"],
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r"\bigcirc": _symbols[r"\lgwhtcircle"],
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r"\Box": _symbols[r"\square"],
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r"\circledS": "024C8",
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r"\diagdown": "02572",
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r"\diagup": "02571",
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r"\dots": "02026",
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r"\dotsb": _symbols[r"\cdots"],
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r"\dotsc": "02026",
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r"\dotsi": _symbols[r"\cdots"],
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r"\dotsm": _symbols[r"\cdots"],
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r"\dotso": "02026",
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r"\emptyset": "02205",
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r"\gggtr": "022D9",
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r"\gvertneqq": "02269",
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r"\gt": _symbols[r"\greater"],
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r"\ldotp": _symbols[r"\period"],
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r"\llless": _symbols[r"\lll"],
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r"\lt": _symbols[r"\less"],
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r"\lvert": _symbols[r"\vert"],
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r"\lVert": _symbols[r"\Vert"],
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r"\lvertneqq": _symbols[r"\lneqq"],
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r"\ngeqq": _symbols[r"\ngeq"],
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r"\nshortmid": _symbols[r"\nmid"],
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r"\nshortparallel": _symbols[r"\nparallel"],
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r"\nsubseteqq": _symbols[r"\nsubseteq"],
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r"\omicron": _symbols[r"\upomicron"],
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r"\rvert": _symbols[r"\vert"],
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r"\rVert": _symbols[r"\Vert"],
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r"\shortmid": _symbols[r"\mid"],
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r"\smallfrown": _symbols[r"\frown"],
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r"\smallint": "0222B",
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r"\smallsmile": _symbols[r"\smile"],
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r"\surd": _symbols[r"\sqrt"],
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r"\thicksim": "0223C",
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r"\thickapprox": _symbols[r"\approx"],
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r"\varsubsetneqq": _symbols[r"\subsetneqq"],
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r"\varsupsetneq": "0228B",
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r"\varsupsetneqq": _symbols[r"\supsetneqq"],
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}
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)
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del _symbols[r"\mathring"] # FIXME: improve tokenizer without removing this
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return _symbols
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