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########################################################################
# $Source: /var/local/cvsroot/4Suite/Ft/Xml/Xvif.py,v $ $Revision: 1.6 $ $Date: 2005/04/07 22:47:58 $
"""
XVIF integration for 4Suite. Includes basic RELAX NG support
Copyright 2002 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
#See http://www.advogato.org/proj/xvif/
#Basic RELAX NG support
from xml.dom import Node
from Ft.Xml import InputSource, Sax
from Ft.Xml.Domlette import NonvalidatingReader
from Ft.Xml.ThirdParty.Xvif import rng
class RelaxNgValidator:
"""
A class providing RELAX NG support
"""
def __init__(self, isrc):
parser = Sax.CreateParser()
self._schema = rng.RngParser()
parser.setContentHandler(self._schema)
parser.parse(isrc)
def isValid(self, isrc):
reader = NonvalidatingReader
doc = reader.parse(isrc)
return self.isValidNode(doc.firstChild)
def isValidNode(self, node):
deriv = self.validateNode(node)
isvalid = deriv.nullable()
#isvalid = isinstance(deriv, rng.Empty)
return isvalid
def validate(self, isrc):
reader = NonvalidatingReader
doc = reader.parse(isrc)
return self.validateNode(doc.firstChild)
def validateNode(self, node):
if node.nodeType == Node.DOCUMENT_NODE:
node = node.firstChild
#s = copy.deepcopy(schema.grammar)
return self._schema.grammar.deriv(node)
class RngInvalid(Exception):
def __init__(self, rngResult):
# By defining __str__, args will be available. Otherwise
# the __init__ of Exception sets it to the passed in arguments.
self.message = rngResult.msg
Exception.__init__(self, self.message)
##class XvifProcessor:
## """
## EXPERIMENTAL
## A class providing XVIF processing support
## """
## def __init__(self, isrc):
## parser = Sax.CreateParser()
## self._schema = rng.RngParser()
## parser.setContentHandler(self._schema)
## parser.parse(isrc)
## def process(self, isrc):
## reader = NonvalidatingReader
## doc = reader.parse(isrc)
## return self.execute(doc)
## def execute(self, doc):
## reader = NonvalidatingReader
## doc = reader.parse(isrc)
## #s = copy.deepcopy(schema.grammar)
## deriv = self._schema.grammar.deriv(doc.firstChild)
## #isvalid = deriv.isnullable()
## isvalid = isinstance(deriv, rng.Empty)
## return isvalid
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