120     def __init__(self, buf, pos, message):  argument
124         self.line, self.column = Lexer.compute_line_column(buf, pos)
136     def __init__(self, buf, offset=0, path=None):  argument
144         self.buf = buf
162                 raise LexerError(self.buf, self.start,
169         buf_len = len(self.buf)
172             self.token, self.end, self.literal = self.lex(self.buf, self.start)
182     def compute_line_column(buf, pos):  argument
186         prior = buf[0:pos]
206     def decode_oct(buf, offset, start, end):  argument
210         if end > len(buf):
211             raise LexerError(buf, offset, 'bad octal escape sequence')
213             codepoint = int(buf[start:end], 8)
215             raise LexerError(buf, offset, 'bad octal escape sequence')
217             raise LexerError(buf, offset, 'bad octal escape sequence')
222     def decode_hex(buf, offset, start, end):  argument
226         if end > len(buf):
227             raise LexerError(buf, offset, 'bad hex escape sequence')
229             return int(buf[start:end], 16)
231             raise LexerError(buf, offset, 'bad hex escape sequence')
235     def lex_interpreted_string(cls, buf, offset):  argument
248         buf_len = len(buf)
253             match = cls.UNICODE_CHARS_PATTERN.match(buf, pos)
259                 char = buf[pos]
261                 raise LexerError(buf, pos,
266                     char = buf[pos + 1]
268                     raise LexerError(buf, pos, 'bad escape sequence')
270                     literal += chr(cls.decode_oct(buf, pos, pos + 1, pos + 4))
273                     literal += chr(cls.decode_hex(buf, pos, pos + 2, pos + 4))
277                         cls.decode_hex(buf, pos, pos + 2, pos + 6))
281                         cls.decode_hex(buf, pos, pos + 2, pos + 10))
288                         raise LexerError(buf, pos, 'bad escape sequence')
293             raise LexerError(buf, pos, 'unclosed interpreted string literal')
297     def lex_string(cls, buf, offset):  argument
309         char = buf[offset]
312                 end = buf.index('`', offset + 1)
313                 return (end + 1, buf[offset + 1 : end])
315                 raise LexerError(buf, len(buf), 'unclosed raw string literal')
317             return cls.lex_interpreted_string(buf, offset)
318         raise LexerError(buf, offset, 'no string literal start character')
348     def lex(cls, buf, offset):  argument
361         match = cls.LEXER_MATCHER.match(buf, offset)
363             raise LexerError(buf, offset, 'unknown token')
367             end, literal = cls.lex_string(buf, offset)
371                 literal = buf[offset:end]
564             Lexer.compute_line_column(lexer.buf, lexer.start)