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- #-----------------------------------------------------------------
- # plyparser.py
- #
- # PLYParser class and other utilites for simplifying programming
- # parsers with PLY
- #
- # Copyright (C) 2008-2015, Eli Bendersky
- # License: BSD
- #-----------------------------------------------------------------
- class Coord(object):
- """ Coordinates of a syntactic element. Consists of:
- - File name
- - Line number
- - (optional) column number, for the Lexer
- """
- __slots__ = ('file', 'line', 'column', '__weakref__')
- def __init__(self, file, line, column=None):
- self.file = file
- self.line = line
- self.column = column
- def __str__(self):
- str = "%s:%s" % (self.file, self.line)
- if self.column: str += ":%s" % self.column
- return str
- class ParseError(Exception): pass
- class PLYParser(object):
- def _create_opt_rule(self, rulename):
- """ Given a rule name, creates an optional ply.yacc rule
- for it. The name of the optional rule is
- <rulename>_opt
- """
- optname = rulename + '_opt'
- def optrule(self, p):
- p[0] = p[1]
- optrule.__doc__ = '%s : empty\n| %s' % (optname, rulename)
- optrule.__name__ = 'p_%s' % optname
- setattr(self.__class__, optrule.__name__, optrule)
- def _coord(self, lineno, column=None):
- return Coord(
- file=self.clex.filename,
- line=lineno,
- column=column)
- def _parse_error(self, msg, coord):
- raise ParseError("%s: %s" % (coord, msg))
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