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81 lines
1.6 KiB
81 lines
1.6 KiB
"""ChordPro lexer"""
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import logging
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import ply.lex as lex
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LOGGER = logging.getLogger()
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#pylint: disable=invalid-name
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tokens = (
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#'LBRACKET',
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#'RBRACKET',
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'CHORD',
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'LBRACE',
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'RBRACE',
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'NEWLINE',
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#'COLON',
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'WORD',
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'SPACE',
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#'NUMBER',
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)
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class ChordProLexer:
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"""ChordPro Lexer class"""
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tokens = tokens
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states = (
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('chord', 'exclusive'),
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)
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t_LBRACE = r'{'
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t_RBRACE = r'}'
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t_SPACE = r'[ \t]+'
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#t_COLON = r':'
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t_chord_CHORD = r'[A-G7#m]+' # TODO This can be refined
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def __init__(self):
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self.__class__.lexer = lex.lex(module=self)
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# Define a rule so we can track line numbers
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@staticmethod
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def t_NEWLINE(token):
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r'[\n\r]'
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token.lexer.lineno += 1
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return token
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@staticmethod
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def t_COMMENT(token):
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r'\#.*'
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pass
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@staticmethod
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def t_WORD(token):
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r'[^\n\][\t ]+'
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return token
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def t_LBRACKET(self, token):
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r'\['
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self.lexer.push_state('chord')
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def t_chord_RBRACKET(self, token):
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r'\]'
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self.lexer.pop_state()
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#@staticmethod
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#def t_NUMBER(token):
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# r'[0-9]+'
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# token.value = int(token.value)
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# return token
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@staticmethod
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def t_error(token):
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"""Manage errors"""
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LOGGER.error("Illegal character '{}'".format(token.value[0]))
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token.lexer.skip(1)
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@staticmethod
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def t_chord_error(token):
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"""Manage errors"""
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LOGGER.error("Illegal character '{}' in chord..".format(token.value[0]))
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token.lexer.skip(1)
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