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########################################################################
# $Header: /var/local/cvsroot/4Suite/Ft/Xml/Xslt/GenericVariable.py,v 1.25 2005/04/06 23:05:47 jkloth Exp $
"""
Base implementation of XSLT variable assigning elements
Copyright 2002 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
import warnings
from Ft.Xml import EMPTY_NAMESPACE
from Ft.Xml.Xslt import XsltElement, XsltException, Error, XSL_NAMESPACE
from Ft.Xml.Xslt import ContentInfo, AttributeInfo
from Ft.Xml.XPath import FT_EXT_NAMESPACE
# for variable binding
from Ft.Xml.Xslt.StylesheetTree import XsltNode
class GenericVariableElement(XsltElement):
category = None
content = ContentInfo.Template
legalAttrs = {
'name' : AttributeInfo.QName(required=1),
'select' : AttributeInfo.Expression(),
'f:node-set' : AttributeInfo.YesNoAvt(default='no'),
}
doesSetup = True
def setup(self):
# Check for deprecated f:node-set
if (FT_EXT_NAMESPACE, 'node-set') in self.attributes:
warnings.warn("You are using the deprecated f:node-set attribute"
" on xsl:variable or xsl:param. Please switch to"
" using exslt:node-set", DeprecationWarning, 2)
# check for a bad binding
if self._select and self.children:
raise XsltException(Error.VAR_WITH_CONTENT_AND_SELECT, self._name)
# See the bottom of this file for these helper "nodes"
binding_save = self.parent.children[0]
if not isinstance(binding_save, PushVariablesNode):
# varBindings not yet saved for this level in the stylesheet tree
parent = self.parent
binding_save = PushVariablesNode(parent.root, parent.baseUri)
parent.insertChild(0, binding_save)
parent.root.primeInstructions.append(binding_save)
return
def instantiate(self, context, processor):
# NOTE: all we want to do is change the varBindings
context.processorNss = self.namespaces
context.currentInstruction = self
if self._select:
result = self._select.evaluate(context)
elif self.children:
#This used to be a try with the popResult() in the finally.
#But this would cause masking of underlying exceptions triggered
#in variable bodies. See
#http://lists.fourthought.com/pipermail/4suite-dev/2003-March/001236.html
processor.pushResultTree(self.baseUri)
for child in self.children:
child.instantiate(context, processor)
result = processor.popResult()
# Why is the check for childNodes necessary? This will always
# be an RTF.
if self.attributes.get((FT_EXT_NAMESPACE, 'node-set')) == 'yes' \
and hasattr(result, 'childNodes'):
result = [result]
else:
result = u""
context.varBindings[self._name] = result
return
# pseudo-nodes for save/restore of variable bindings
class PushVariablesNode(XsltNode):
def __init__(self, root, baseUri):
self.root = root
self.baseUri = baseUri
self.savedVariables = []
self.popNode = PopVariablesNode(self.savedVariables)
self._is_primed = False
return
def prime(self, processor, context):
if not self._is_primed:
self.parent.children.append(self.popNode)
self._is_primed = True
return
def instantiate(self, context, processor):
self.savedVariables.append(context.varBindings)
context.varBindings = context.varBindings.copy()
return
def isPseudoNode(self):
return True
class PopVariablesNode(XsltNode):
def __init__(self, savedVariables):
self.savedVariables = savedVariables
return
def instantiate(self, context, processor):
context.varBindings = self.savedVariables.pop()
return
def isPseudoNode(self):
return True
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