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40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
from __future__ import annotations
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import re
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from manimlib.utils.tex_to_symbol_count import TEX_TO_SYMBOL_COUNT
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def num_tex_symbols(tex: str) -> int:
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"""
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This function attempts to estimate the number of symbols that
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a given string of tex would produce.
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Warning, it may not behave perfectly
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"""
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# First, remove patterns like \begin{align}, \phantom{thing},
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# \begin{array}{cc}, etc.
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pattern = "|".join(
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rf"(\\{s})" + r"(\{\w+\})?(\{\w+\})?(\[\w+\])?"
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for s in ["begin", "end", "phantom", "text"]
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)
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tex = re.sub(pattern, "", tex)
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# Progressively count the symbols associated with certain tex commands,
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# and remove those commands from the string, adding the number of symbols
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# that command creates
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total = 0
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# Start with the special case \sqrt[number]
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for substr in re.findall(r"\\sqrt\[[0-9]+\]", tex):
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total += len(substr) - 5 # e.g. \sqrt[3] is 3 symbols
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tex = tex.replace(substr, " ")
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general_command = r"\\[a-zA-Z!,-/:;<>]+"
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for substr in re.findall(general_command, tex):
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total += TEX_TO_SYMBOL_COUNT.get(substr, 1)
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tex = tex.replace(substr, " ")
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# Count remaining characters
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total += sum(map(lambda c: c not in "^{} \n\t_$\\&", tex))
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return total
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