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##############################################################################
#
# Copyright (c) 2008-2009 Nexedi SA and Contributors. All Rights Reserved.
# Vincent Pelletier <vincent@nexedi.com>
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsability of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# garantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
##############################################################################
from ply import lex, yacc
import os
import sys
from cStringIO import StringIO
try:
from zLOG import LOG
except ImportError:
def LOG(channel, level, message):
print >>sys.stderr, message
module_path = os.path.dirname(os.path.abspath(__file__))
class ParserOrLexerError(Exception):
pass
class LexerError(ParserOrLexerError):
pass
class ParserError(ParserOrLexerError):
pass
class lexer(object):
def init(self, **kw):
debug = kw.pop('debug', False)
# Catch all logs with a cStringIO
output = sys.stdout = sys.stderr = StringIO()
self.lexer = lex.lex(object=self, **kw)
self.parser = yacc.yacc(module=self, debug=debug,
debugfile="%s.out" % (self.__class__.__name__, ),
tabmodule="%s_parsetab" % (self.__class__.__name__, ),
outputdir=module_path)
sys.stdout, sys.stderr = sys.__stdout__, sys.__stderr__
# Emit all logs with regular Zope logging
for line in output.getvalue().split('\n'):
if len(line):
LOG('lexer', 0, line)
def t_error(self, t):
raise LexerError, 'ERROR: Invalid character %r' % (t.value[0], )
def p_error(self, p):
raise ParserError, 'Syntax error in input: %r' % (p, )
def input(self, string):
self.lexer.input(string)
def token(self):
return self.lexer.token()
tokens = (
'OR',
'AND',
'NOT',
'COLUMN',
'STRING',
'WORD',
'OPERATOR',
'LEFT_PARENTHESE',
'RIGHT_PARENTHESE')
t_ignore = ' '
def t_LEFT_PARENTHESE(self, t):
r'\('
return t
def t_RIGHT_PARENTHESE(self, t):
r'\)'
return t
def t_OPERATOR(self, t):
r'(>=?|<=?|!?=)'
return t
def t_STRING(self, t):
r'"(\\.|[^\\"])*"'
# Unescape value and strip surrounding quotes
value_list = []
append = value_list.append
escaped = False
for char in t.value[1:-1]:
if escaped:
escaped = False
if char != '"':
append('\\')
else:
if char == '\\':
escaped = True
continue
append(char)
assert not escaped
t.value = ''.join(value_list)
return t
def t_COLUMN(self, t):
r'[^><= :\(\)"][^ :\(\)"]*:'
t.value = t.value[:-1]
return t
def t_OR(self, t):
r'OR'
return t
def t_AND(self, t):
r'AND'
return t
def t_NOT(self, t):
r'NOT'
return t
def t_WORD(self, t):
r'[^><= :\(\)"][^ :\(\)"]*'
return t
def parse(self, *args, **kw):
kw['lexer'] = self
return self.parser.parse(*args, **kw)
__call__ = parse
def update_docstrings(klass):
for property in dir(klass):
if property.startswith('t_'):
source = getattr(lexer, property, None)
if callable(source):
destination = getattr(klass, property)
assert callable(destination)
if destination.__doc__ is None:
destination.im_func.__doc__ = source.__doc__