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########################################################################
# $Header: /var/local/cvsroot/4Suite/Ft/Xml/Xslt/AttributeElement.py,v 1.18 2005/04/06 23:05:47 jkloth Exp $
"""
Implementation of xsl:attribute element
Copyright 2003 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
from Ft.Xml import EMPTY_NAMESPACE
from Ft.Xml.Xslt import XsltElement, XsltRuntimeException, Error, XSL_NAMESPACE
from Ft.Xml.Xslt import CategoryTypes, ContentInfo, AttributeInfo
class AttributeElement(XsltElement):
category = CategoryTypes.INSTRUCTION
content = ContentInfo.Template
legalAttrs = {
'name' : AttributeInfo.RawQNameAvt(required=1),
'namespace' : AttributeInfo.UriReferenceAvt(isNsName=1),
}
def instantiate(self, context, processor):
context.processorNss = self.namespaces
context.currentInstruction = self
(prefix, local) = self._name.evaluate(context)
if prefix is not None:
name = prefix + ':' + local
else:
name = local
if name == 'xmlns':
raise XsltRuntimeException(Error.BAD_ATTRIBUTE_NAME, self, name)
# From sec. 7.1.3 of the XSLT spec,
# 1. if 'namespace' attr is not present, use ns in scope, based on prefix
# from the element QName in the 'name' attr value; if no prefix, use
# empty namespace
# 2. if 'namespace' attr is present and empty string, use empty ns ALWAYS
# 3. if 'namespace' attr is present, namespace is attr value
#
if not self._namespace:
if prefix is not None:
if not self.namespaces.has_key(prefix):
raise XsltRuntimeException(Error.UNDEFINED_PREFIX,
self, prefix)
namespace = self.namespaces[prefix]
else:
namespace = EMPTY_NAMESPACE
else:
namespace = (self._namespace and self._namespace.evaluate(context)
or EMPTY_NAMESPACE)
processor.pushResultString()
had_nontext = 0
try:
for child in self.children:
child.instantiate(context, processor)
if processor.writers[-1].had_nontext:
had_nontext = 1
finally:
if had_nontext:
raise XsltRuntimeException(Error.NONTEXT_IN_ATTRIBUTE, self)
content = processor.popResult()
processor.writers[-1].attribute(name, content, namespace)
return
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