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# encoding:UTF-8
####################################################################
# #
# THIS FILE IS PART OF THE pycollada LIBRARY SOURCE CODE. #
# USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS #
# GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE #
# IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. #
# #
# THE pycollada SOURCE CODE IS (C) COPYRIGHT 2011 #
# by Jeff Terrace and contributors #
# #
####################################################################
"""This module contains helper classes and functions for working
with the COLLADA 1.4.1 schema."""
import lxml
import lxml.etree
from collada.util import bytes, BytesIO
from pkg_resources import resource_string
# get a copy of the XML schema
# resource_string returns bytes so decode into string
COLLADA_SCHEMA_1_4_1 = str(resource_string(
'collada',
'resources/schema-1.4.1.xml').decode('utf-8'))
XML_XSD = str(resource_string(
'collada',
'resources/xsd.xml').decode('utf-8'))
class ColladaResolver(lxml.etree.Resolver):
"""COLLADA XML Resolver. If a known URL referenced
from the COLLADA spec is resolved, a cached local
copy is returned instead of initiating a network
request"""
def resolve(self, url, id, context):
"""Currently Resolves:
* http://www.w3.org/2001/03/xml.xsd
"""
if url == 'http://www.w3.org/2001/03/xml.xsd':
return self.resolve_string(XML_XSD, context)
else:
return None
class ColladaValidator(object):
"""Validates a collada lxml document"""
def __init__(self):
"""Initializes the validator"""
self.COLLADA_SCHEMA_1_4_1_DOC = None
self._COLLADA_SCHEMA_1_4_1_INSTANCE = None
def _getColladaSchemaInstance(self):
if self._COLLADA_SCHEMA_1_4_1_INSTANCE is None:
self._parser = lxml.etree.XMLParser()
self._parser.resolvers.add(ColladaResolver())
self.COLLADA_SCHEMA_1_4_1_DOC = lxml.etree.parse(
BytesIO(bytes(COLLADA_SCHEMA_1_4_1, encoding='utf-8')),
self._parser)
self._COLLADA_SCHEMA_1_4_1_INSTANCE = lxml.etree.XMLSchema(
self.COLLADA_SCHEMA_1_4_1_DOC)
return self._COLLADA_SCHEMA_1_4_1_INSTANCE
COLLADA_SCHEMA_1_4_1_INSTANCE = property(_getColladaSchemaInstance)
"""An instance of lxml.XMLSchema that can be used to validate"""
def validate(self, *args, **kwargs):
"""A wrapper for lxml.XMLSchema.validate"""
return self.COLLADA_SCHEMA_1_4_1_INSTANCE.validate(*args, **kwargs)
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