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# Copyright (c) 2006-2011 Nathan Binkert <nate@binkert.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import os
import ply.lex
import ply.yacc
class ParseError(Exception):
def __init__(self, message, token=None):
Exception.__init__(self, message)
self.token = token
class Grammar(object):
def setupLexerFactory(self, **kwargs):
if 'module' in kwargs:
raise AttributeError, "module is an illegal attribute"
self.lex_kwargs = kwargs
def setupParserFactory(self, **kwargs):
if 'module' in kwargs:
raise AttributeError, "module is an illegal attribute"
if 'output' in kwargs:
dir,tab = os.path.split(output)
if not tab.endswith('.py'):
raise AttributeError, \
'The output file must end with .py'
kwargs['outputdir'] = dir
kwargs['tabmodule'] = tab[:-3]
self.yacc_kwargs = kwargs
def __getattr__(self, attr):
if attr == 'lexers':
self.lexers = []
return self.lexers
if attr == 'lex_kwargs':
self.setupLexerFactory()
return self.lex_kwargs
if attr == 'yacc_kwargs':
self.setupParserFactory()
return self.yacc_kwargs
if attr == 'lex':
self.lex = ply.lex.lex(module=self, **self.lex_kwargs)
return self.lex
if attr == 'yacc':
self.yacc = ply.yacc.yacc(module=self, **self.yacc_kwargs)
return self.yacc
if attr == 'current_lexer':
if not self.lexers:
return None
return self.lexers[-1][0]
if attr == 'current_source':
if not self.lexers:
return '<none>'
return self.lexers[-1][1]
if attr == 'current_line':
if not self.lexers:
return -1
return self.current_lexer.lineno
raise AttributeError, \
"'%s' object has no attribute '%s'" % (type(self), attr)
def parse_string(self, data, source='<string>', debug=None, tracking=0):
if not isinstance(data, basestring):
raise AttributeError, \
"argument must be a string, was '%s'" % type(f)
import new
lexer = self.lex.clone()
lexer.input(data)
self.lexers.append((lexer, source))
dict = {
'productions' : self.yacc.productions,
'action' : self.yacc.action,
'goto' : self.yacc.goto,
'errorfunc' : self.yacc.errorfunc,
}
parser = new.instance(ply.yacc.LRParser, dict)
result = parser.parse(lexer=lexer, debug=debug, tracking=tracking)
self.lexers.pop()
return result
def parse_file(self, f, **kwargs):
if isinstance(f, basestring):
source = f
f = file(f, 'r')
elif isinstance(f, file):
source = f.name
else:
raise AttributeError, \
"argument must be either a string or file, was '%s'" % type(f)
return self.parse_string(f.read(), source, **kwargs)
def p_error(self, t):
if t:
msg = "Syntax error at %s:%d:%d\n>>%s<<" % \
(self.current_source, t.lineno, t.lexpos + 1, t.value)
else:
msg = "Syntax error at end of %s" % (self.current_source, )
raise ParseError(msg, t)
def t_error(self, t):
msg = "Illegal character %s @ %d:%d" % \
(`t.value[0]`, t.lineno, t.lexpos)
raise ParseError(msg, t)
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