cogent3.core.alphabet.make_text_to_array_converter

make_text_to_array_converter(alphabet: CharAlphabet[Any], delete: bytes = b'\n\r\t 0123456789') → bytes_to_array

make a converter from text bytes to alphabet indices.

Parameters:

alphabet

the target character alphabet; must have at most 256 elements

delete

bytes stripped from the input before mapping

Notes

The returned converter performs case folding, deletion, and char-to-index mapping in a single bytes.translate call. Indices are packed as single bytes in the translation table, which is why len(alphabet) cannot exceed 256.