67 lines
2.0 KiB
Python
67 lines
2.0 KiB
Python
import re
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from igitar.constants import CHORD_SUFFIXES, ENGLISH_NOTES, GERMAN_NOTES, NEOLATIN_NOTES
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_chord_cache = {}
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_line_cache = {}
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def _get_chord_regex(notes):
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"""
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Create the regex for a particular set of notes
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:param notes: The regular expression for a set of valid notes
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:return: An expanded regular expression for valid chords
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"""
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chord = notes + CHORD_SUFFIXES
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return '(' + chord + '(/' + chord + ')?)'
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def _get_chord_match(notes):
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"""
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Construct chord matching regular expression object
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:param notes: The regular expression for a set of valid notes
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:return: A compiled regular expression object
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"""
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return re.compile(r'\[' + _get_chord_regex(notes) + r'\]')
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def _get_line_match(notes):
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"""
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Construct a chord line matching regular expression object
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:param notes: The regular expression for a set of valid notes
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:return: A compiled regular expression object
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"""
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return re.compile(r'\[' + _get_chord_regex(notes) + r'\]([\u0080-\uFFFF,\w]*)'
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r'([\u0080-\uFFFF\w\s\.\,\!\?\;\:\|\"\'\-\_]*)(\Z)?')
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def _get_chords_for_notation(notation):
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"""
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Get the right chord_match object based on the current chord notation
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"""
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if notation not in _chord_cache.keys():
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if notation == 'german':
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_chord_cache[notation] = _get_chord_match(GERMAN_NOTES)
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elif notation == 'neo-latin':
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_chord_cache[notation] = _get_chord_match(NEOLATIN_NOTES)
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else:
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_chord_cache[notation] = _get_chord_match(ENGLISH_NOTES)
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return _chord_cache[notation]
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def _get_line_for_notation(notation):
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"""
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Get the right chord line match based on the current chord notation
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"""
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if notation not in _line_cache.keys():
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if notation == 'german':
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_line_cache[notation] = _get_line_match(GERMAN_NOTES)
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elif notation == 'neo-latin':
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_line_cache[notation] = _get_line_match(NEOLATIN_NOTES)
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else:
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_line_cache[notation] = _get_line_match(ENGLISH_NOTES)
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return _line_cache[notation]
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