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|
########################################################################
#
# File Name: StylesheetReader.py
#
#
"""
Create a stylesheet object
WWW: http://4suite.org/4XSLT e-mail: support@4suite.org
Copyright (c) 1999-2001 Fourthought Inc, USA. All Rights Reserved.
See http://4suite.org/COPYRIGHT for license and copyright information
"""
import string, os, urllib, cStringIO
try:
from Ft.Lib.ReaderBase import DomletteReader
_ReaderBase = DomletteReader
except ImportError:
from minisupport import MinidomReader
_ReaderBase = MinidomReader
#FIXME: we might want to do some meta-magic to __import__ element modules on demand
from xml.xslt.ApplyTemplatesElement import ApplyTemplatesElement
from xml.xslt.AttributeElement import AttributeElement
from xml.xslt.AttributeSetElement import AttributeSetElement
from xml.xslt.CallTemplateElement import CallTemplateElement
from xml.xslt.ChooseElement import ChooseElement
from xml.xslt.CopyElement import CopyElement
from xml.xslt.CopyOfElement import CopyOfElement
from xml.xslt.CommentElement import CommentElement
from xml.xslt.ElementElement import ElementElement
from xml.xslt.ForEachElement import ForEachElement
from xml.xslt.IfElement import IfElement
from xml.xslt.LiteralElement import LiteralElement
from xml.xslt.LiteralText import LiteralText
from xml.xslt.MessageElement import MessageElement
from xml.xslt.NumberElement import NumberElement
from xml.xslt.OtherwiseElement import OtherwiseElement
from xml.xslt.ParamElement import ParamElement
from xml.xslt.ProcessingInstructionElement import ProcessingInstructionElement
from xml.xslt.SortElement import SortElement
from xml.xslt.TemplateElement import TemplateElement
from xml.xslt.TextElement import TextElement
from xml.xslt.VariableElement import VariableElement
from xml.xslt.ValueOfElement import ValueOfElement
from xml.xslt.WhenElement import WhenElement
from xml.xslt.WithParamElement import WithParamElement
from xml.xslt.OtherXslElement import ImportElement, IncludeElement, DecimalFormatElement, KeyElement, NamespaceAliasElement, OutputElement, PreserveSpaceElement, StripSpaceElement, FallbackElement
from xml.xslt.Stylesheet import StylesheetElement
from xml.xslt import XSL_NAMESPACE, XsltElement
from xml.xslt import XsltException, Error, ReleaseNode, RegisterExtensionModules
from xml import xslt
from xml.dom import Node
from xml.dom.ext import StripXml, GetAllNs, SplitQName
from xml.dom import implementation, ext, XML_NAMESPACE, XMLNS_NAMESPACE, EMPTY_NAMESPACE
try:
from Ft.Lib import FtException
import Ft.Lib
XML_PARSE_ERROR = Ft.Lib.Error.XML_PARSE_ERROR
except ImportError:
XML_PARSE_ERROR = "XML_PARSE_ERROR"
# XXX need better definition
class FtException(Exception):
pass
import cPickle
try:
from Ft.Lib import pDomlette
createDocument = pDomlette.Document
def CreateInstantStylesheet(sheet):
return pDomlette.PickleDocument(sheet.ownerDocument)
def FromInstant(dump, forceBaseUri=None):
return UnpickleDocument(dump, forceBaseUri).documentElement
except ImportError:
from xml.dom import minitraversal
import pickle
createDocument = minitraversal.Document
def CreateInstantStylesheet(sheet):
return pickle.dumps(sheet, 1)
def FromInstant(dump, forceBaseUri=None):
assert not forceBaseUri
return pickle.loads(dump)
g_mappings = {XSL_NAMESPACE: {
'apply-templates': ApplyTemplatesElement
, 'attribute': AttributeElement
, 'attribute-set': AttributeSetElement
, 'call-template': CallTemplateElement
, 'choose': ChooseElement
, 'copy': CopyElement
, 'copy-of': CopyOfElement
, 'comment': CommentElement
, 'element': ElementElement
, 'for-each': ForEachElement
, 'if': IfElement
, 'message': MessageElement
, 'number': NumberElement
, 'otherwise': OtherwiseElement
, 'param': ParamElement
, 'processing-instruction': ProcessingInstructionElement
, 'sort': SortElement
, 'stylesheet': StylesheetElement
, 'transform': StylesheetElement
, 'template': TemplateElement
, 'text': TextElement
, 'variable': VariableElement
, 'value-of': ValueOfElement
, 'when': WhenElement
, 'fallback': FallbackElement
, 'with-param': WithParamElement
, 'import': ImportElement
, 'include': IncludeElement
, 'key': KeyElement
, 'namespace-alias': NamespaceAliasElement
, 'output': OutputElement
, 'preserve-space': PreserveSpaceElement
, 'strip-space': StripSpaceElement
}}
def FromDocument(oldDoc, baseUri='',stylesheetReader = None):
#FIXME: We really shouldn't mutate the given doc, but this is the easiest way to strip whitespace
if baseUri and baseUri[-1] == '/':
modBaseUri = baseUri
else:
modBaseUri = baseUri + '/'
oldDoc.normalize()
extElements = xslt.g_extElements
source_root = oldDoc.documentElement
#Set up a new document for the stylesheet nodes
if source_root.namespaceURI == XSL_NAMESPACE:
if source_root.localName not in ['stylesheet', 'transform']:
raise XsltException(Error.STYLESHEET_ILLEGAL_ROOT, source_root.nodeName)
result_elem_root = 0
else:
result_elem_root = 1
xsl_doc = createDocument()
ext_uris = []
if result_elem_root:
vattr = source_root.getAttributeNodeNS(XSL_NAMESPACE, 'version')
if not vattr:
root_nss = GetAllNs(source_root)
if filter(lambda x, n=root_nss: n[x] == XSL_NAMESPACE, root_nss.keys()):
raise XsltException(Error.STYLESHEET_MISSING_VERSION)
else:
raise XsltException(Error.STYLESHEET_MISSING_VERSION_NOTE1)
sheet = StylesheetElement(xsl_doc, XSL_NAMESPACE,
'transform', vattr.prefix,
baseUri)
sheet.setAttributeNS(EMPTY_NAMESPACE, 'version', vattr.value)
tpl = TemplateElement(xsl_doc, XSL_NAMESPACE, 'template',
vattr.prefix, baseUri)
tpl.setAttributeNS(EMPTY_NAMESPACE, 'match', '/')
sheet.appendChild(tpl)
sheet.__dict__['extensionNss'] = []
xsl_doc.appendChild(sheet)
DomConvert(source_root, tpl, xsl_doc, [], extElements, 0)
else:
sheet = StylesheetElement(xsl_doc, source_root.prefix, source_root.localName, baseUri=baseUri)
sty_nss = GetAllNs(source_root)
for attr in source_root.attributes.values():
if (attr.namespaceURI, attr.localName) == ('', 'extension-element-prefixes'):
ext_prefixes = string.splitfields(attr.value)
for prefix in ext_prefixes:
if prefix == '#default': prefix = ''
ext_uris.append(sty_nss[prefix])
sheet.setAttributeNS(attr.namespaceURI, attr.nodeName, attr.value)
sheet.__dict__['extensionNss'] = ext_uris
if not sheet.getAttributeNS(EMPTY_NAMESPACE, 'version'):
raise XsltException(Error.STYLESHEET_MISSING_VERSION)
xsl_doc.appendChild(sheet)
for child in source_root.childNodes:
DomConvert(child, sheet, xsl_doc, ext_uris, extElements, 0)
#Handle includes
includes = filter(lambda x: x.nodeType == Node.ELEMENT_NODE and (x.namespaceURI, x.localName) == (XSL_NAMESPACE, 'include'), sheet.childNodes)
for inc in includes:
href = inc.getAttributeNS(EMPTY_NAMESPACE,'href')
if stylesheetReader is None:
stylesheetReader = StylesheetReader()
docfrag = stylesheetReader.fromUri(href,baseUri = baseUri, ownerDoc=xsl_doc)
sty = docfrag.firstChild
included_nss = GetAllNs(sty)
for child in sty.childNodes[:]:
if child.nodeType != Node.ELEMENT_NODE:
continue
sheet.insertBefore(child, inc)
#migrate old nss from stylesheet directly to new child
for prefix in included_nss.keys():
if prefix:
child.setAttributeNS(XMLNS_NAMESPACE, 'xmlns:'+prefix,
included_nss[prefix])
else:
child.setAttributeNS(XMLNS_NAMESPACE, 'xmlns',
included_nss[prefix])
sheet.removeChild(inc)
ReleaseNode(inc)
#sty.reclaim()
try:
sheet.setup()
except:
ReleaseNode(sheet.ownerDocument)
raise
return sheet
def DomConvert(node, xslParent, xslDoc, extUris, extElements, preserveSpace):
if node.nodeType == Node.ELEMENT_NODE:
mapping = g_mappings.get(node.namespaceURI, None)
if mapping:
if not mapping.has_key(node.localName):
raise XsltException(Error.XSLT_ILLEGAL_ELEMENT, node.localName)
xsl_class = mapping[node.localName]
xsl_instance = xsl_class(xslDoc, baseUri=xslParent.baseUri)
for attr in node.attributes.values():
if not attr.namespaceURI and attr.localName not in xsl_instance.__class__.legalAttrs:
raise XsltException(Error.XSLT_ILLEGAL_ATTR,
attr.nodeName, xsl_instance.nodeName)
xsl_instance.setAttributeNS(attr.namespaceURI, attr.nodeName,
attr.value)
xslParent.appendChild(xsl_instance)
elif node.namespaceURI in extUris:
name = (node.namespaceURI, node.localName)
if name in extElements.keys():
ext_class = extElements[name]
else:
#Default XsltElement behavior effects fallback
ext_class = XsltElement
xsl_instance = ext_class(xslDoc, node.namespaceURI,
node.localName, node.prefix,
xslParent.baseUri)
for attr in node.attributes.values():
if (attr.namespaceURI, attr.localName) == (XSL_NAMESPACE, 'extension-element-prefixes'):
ext_prefixes = string.splitfields(attr.value)
for prefix in ext_prefixes:
if prefix == '#default': prefix = ''
extUris.append(node_nss[prefix])
xsl_instance.setAttributeNS(attr.namespaceURI, attr.nodeName,
attr.value)
xslParent.appendChild(xsl_instance)
else:
xsl_instance = LiteralElement(xslDoc, node.namespaceURI,
node.localName, node.prefix,
xslParent.baseUri)
node_nss = GetAllNs(node)
for attr in node.attributes.values():
if (attr.namespaceURI, attr.localName) == (XSL_NAMESPACE, 'extension-element-prefixes'):
ext_prefixes = string.splitfields(attr.value)
for prefix in ext_prefixes:
if prefix == '#default': prefix = ''
extUris.append(node_nss[prefix])
xsl_instance.setAttributeNS(attr.namespaceURI,
attr.nodeName,
attr.value
)
xslParent.appendChild(xsl_instance)
ps = (xsl_instance.namespaceURI, xsl_instance.localName) == (XSL_NAMESPACE, 'text') or xsl_instance.getAttributeNS(XML_NAMESPACE,'space') == 'preserve'
#ps = (xsl_instance.namespaceURI, xsl_instance.localName) == (XSL_NAMESPACE, 'text')
for child in node.childNodes:
DomConvert(child, xsl_instance, xslDoc, extUris, extElements, ps)
elif node.nodeType == Node.TEXT_NODE:
if string.strip(node.data) or preserveSpace:
xsl_instance = LiteralText(xslDoc, node.data)
xslParent.appendChild(xsl_instance)
return
### Domlette Parser Interface ###
from xml.parsers import expat
class StylesheetReader(_ReaderBase):
def __init__(self, force8Bit=0):
_ReaderBase.__init__(self)
self.force8Bit = force8Bit
self._ssheetUri = ''
return
def fromUri(self, uri, baseUri='', ownerDoc=None, stripElements=None):
self._ssheetUri = urllib.basejoin(baseUri, uri)
result = _ReaderBase.fromUri(self, uri, baseUri,
ownerDoc, stripElements)
return result
def fromStream(self, stream, baseUri='', ownerDoc=None,
stripElements=None):
if not xslt.g_registered:
xslt.Register()
self.initParser()
self.initState(ownerDoc, baseUri)
p = self.parser
try:
success = self.parser.ParseFile(stream)
except XsltException:
raise
except Exception, e:
for s in self._nodeStack:
self.releaseNode(s)
if p.ErrorCode:
raise FtException(XML_PARSE_ERROR,
p.ErrorLineNumber,
p.ErrorColumnNumber,
expat.ErrorString(p.ErrorCode))
else:
raise
self._ssheetUri = ''
self.killParser()
if not success:
self.releaseNode(self._rootNode)
self.releaseNode(self._ownerDoc)
raise XsltException(Error.STYLESHEET_PARSE_ERROR, baseUri, p.ErrorLineNumber, p.ErrorColumnNumber, expat.ErrorString(p.ErrorCode))
self._completeTextNode()
root = self._rootNode or self._ownerDoc
if root.nodeType == Node.DOCUMENT_NODE:
sheet = root.documentElement
try:
sheet.setup()
except:
sheet.reclaim()
self.releaseNode(root)
raise
else:
sheet = None
rt = sheet or root
return rt
def initParser(self):
if self.force8Bit:
self.handler = Utf8OnlyHandler(self)
else:
self.handler = self
self.parser=expat.ParserCreate()
self.parser.StartElementHandler = self.handler.startElement
self.parser.EndElementHandler = self.handler.endElement
self.parser.CharacterDataHandler = self.handler.characters
self.parser.ProcessingInstructionHandler = self.handler.processingInstruction
self.parser.CommentHandler = self.handler.comment
self.parser.ExternalEntityRefHandler = self.handler.entityRef
return
def initState(self, ownerDoc, refUri):
pDomlette.Handler.initState(self, ownerDoc)
self._preserveStateStack = [0]
self._extUris = []
self._extUriStack = []
self._firstElement = 1
if not self._ssheetUri:
self._ssheetUri = refUri
return
def _completeTextNode(self):
#Note some parsers don't report ignorable white space properly
if self._currText and len(self._nodeStack) and self._nodeStack[-1].nodeType != Node.DOCUMENT_NODE:
if self._preserveStateStack[-1] or string.strip(self._currText):
new_text = LiteralText(self._ownerDoc, self._currText)
self._nodeStack[-1].appendChild(new_text)
self._currText = ''
return
def _initializeSheet(self, rootNode):
if rootNode.namespaceURI == XSL_NAMESPACE:
if rootNode.localName in ['stylesheet', 'transform']:
if not rootNode.getAttributeNS(EMPTY_NAMESPACE, 'version'):
raise XsltException(Error.STYLESHEET_MISSING_VERSION)
#rootNode.__dict__['extensionNss'] = []
else:
raise XsltException(Error.STYLESHEET_ILLEGAL_ROOT, rootNode.nodeName)
else:
vattr = rootNode.getAttributeNodeNS(XSL_NAMESPACE, 'version')
if not vattr:
root_nss = GetAllNs(rootNode)
if filter(lambda x, n=root_nss: n[x] == XSL_NAMESPACE, root_nss.keys()):
raise XsltException(Error.STYLESHEET_MISSING_VERSION)
else:
raise XsltException(Error.STYLESHEET_MISSING_VERSION_NOTE1)
sheet = StylesheetElement(self._ownerDoc, XSL_NAMESPACE,
'transform', vattr.prefix,
self._ssheetUri)
sheet.setAttributeNS(EMPTY_NAMESPACE, 'version', vattr.value)
tpl = TemplateElement(self._ownerDoc, XSL_NAMESPACE, 'template',
vattr.prefix, self._ssheetUri)
tpl.setAttributeNS(EMPTY_NAMESPACE, 'match', '/')
sheet.appendChild(tpl)
sheet.__dict__['extensionNss'] = []
self._nodeStack[-1].appendChild(sheet)
# Ensure the literal element is a child of the template
# endElement appends to the end of the nodeStack
self._nodeStack.append(tpl)
self._firstElement = 0
return
def _handleExtUris(self, ns, local, value, extUri, delExtu, sheet):
if (ns, local) == (extUri, 'extension-element-prefixes'):
ext_prefixes = string.splitfields(value)
for prefix in ext_prefixes:
if prefix == '#default': prefix = ''
uri = self._namespaces[-1].get(prefix, '')
if uri not in self._extUris:
delExtu.append(uri)
self._extUris.append(uri)
if sheet and not uri in sheet.extensionNss:
sheet.extensionNss.append(uri)
return
def processingInstruction(self, target, data):
self._completeTextNode()
return
def comment(self, data):
self._completeTextNode()
return
def startElement(self, name, attribs):
self._completeTextNode()
(name, qname, nsattribs) = self._handleStartElementNss(name, attribs)
nsuri = name[0]
local = name[1]
prefix = SplitQName(qname)[0]
mapping = g_mappings.get(nsuri, None)
del_extu = []
if mapping:
if not mapping.has_key(local):
if self._firstElement:
raise XsltException(Error.STYLESHEET_ILLEGAL_ROOT, name)
else:
raise XsltException(Error.XSLT_ILLEGAL_ELEMENT, local)
xsl_class = mapping[local]
if xsl_class == IncludeElement:
#Can the included sheet have literal result element as root?
inc = self.clone().fromUri(nsattribs[('', 'href')],
baseUri=self._ssheetUri,
ownerDoc=self._ownerDoc)
sty = inc.firstChild
included_nss = GetAllNs(sty)
for child in sty.childNodes[:]:
self._nodeStack[-1].appendChild(child)
#migrate old nss from stylesheet directly to new child
for prefix in included_nss.keys():
if prefix:
child.setAttributeNS(XMLNS_NAMESPACE,
'xmlns:'+prefix,
included_nss[prefix])
else:
child.setAttributeNS(XMLNS_NAMESPACE, 'xmlns',
included_nss[prefix])
self._nodeStack.append(None)
pDomlette.ReleaseNode(inc)
return
else:
xsl_instance = xsl_class(self._ownerDoc,
baseUri=self._ssheetUri)
for aqname in nsattribs.getQNames():
(ansuri, alocal) = nsattribs.getNameByQName(aqname)
value = nsattribs.getValueByQName(aqname)
if ansuri != XMLNS_NAMESPACE and xsl_class == StylesheetElement:
self._handleExtUris(ansuri, alocal, value, '',
del_extu,xsl_instance)
elif not ansuri and alocal not in xsl_instance.__class__.legalAttrs:
raise XsltException(Error.XSLT_ILLEGAL_ATTR,
aqname, xsl_instance.nodeName)
xsl_instance.setAttributeNS(ansuri, aqname, value)
else:
if nsuri in self._extUris and self._extElements:
#Default XsltElement behavior effects fallback
ext_class = self._extElements.get((nsuri, local), XsltElement)
xsl_instance = ext_class(self._ownerDoc, nsuri, local,
prefix, self._ssheetUri)
else:
xsl_instance = LiteralElement(self._ownerDoc, nsuri, local,
prefix, self._ssheetUri)
for aqname in nsattribs.getQNames():
(ansuri, alocal) = nsattribs.getNameByQName(aqname)
value = nsattribs.getValueByQName(aqname)
if ansuri != XMLNS_NAMESPACE:
self._handleExtUris(ansuri, alocal, value, '',
del_extu, xsl_instance)
if hasattr(xsl_instance.__class__, 'legalAttrs'):
if not ansuri and alocal not in xsl_instance.__class__.legalAttrs:
raise XsltException(Error.XSLT_ILLEGAL_ATTR,
alocal, xsl_instance.nodeName)
xsl_instance.setAttributeNS(ansuri, aqname, value)
self._extUriStack.append(del_extu)
if (xsl_instance.namespaceURI, xsl_instance.localName) == (XSL_NAMESPACE, 'text') or xsl_instance.getAttributeNS(XML_NAMESPACE, 'space') == 'preserve':
self._preserveStateStack.append(1)
elif xsl_instance.getAttributeNS(XML_NAMESPACE, 'space') == 'default':
self._preserveStateStack.append(0)
else:
self._preserveStateStack.append(self._preserveStateStack[-1])
if self._firstElement:
self._initializeSheet(xsl_instance)
self._nodeStack.append(xsl_instance)
return
def endElement(self, name):
if not self._nodeStack[-1]:
del self._nodeStack[-1]
return
self._completeTextNode()
del self._preserveStateStack[-1]
new_element = self._nodeStack[-1]
del self._nodeStack[-1]
del self._namespaces[-1]
self._nodeStack[-1].appendChild(new_element)
del_extu = self._extUriStack[-1]
del self._extUriStack[-1]
for uri in del_extu:
self._extUris.remove(uri)
return
def characters(self, data):
self._currText = self._currText + data
return
def CreateInstantStylesheet(sheet):
return pDomlette.PickleDocument(sheet.ownerDocument)
def FromInstant(dump, forceBaseUri=None):
return UnpickleDocument(dump, forceBaseUri).documentElement
##FIXME
##This unpickling code is Basically a transplant from pDomlette
##with the addition of baseUri overriding in unpickling. It is
##somewhat experimental and not intended to diverge from the pDomlette
##code, and if it ever does so, it should be nixed, and some
##genericity found between this the pDomlette code
import threading, cPickle
g_lock = threading.Lock()
def UnpickleDocument(pickledXml, forceBaseUri=None):
g_lock.acquire()
try:
doc = pDomlette.Document()
stream = cStringIO.StringIO(pickledXml)
unpickler = cPickle.Unpickler(stream)
_UnpickleChildren(unpickler, doc, forceBaseUri)
return doc
finally:
g_lock.release()
def UnpickleNode(pickledXml, doc=None, forceBaseUri=None):
g_lock.acquire()
try:
doc = doc or Document()
stream = cStringIO.StringIO(pickledXml)
unpickler = cPickle.Unpickler(stream)
topLevelNode = unpickler.load()
if forceBaseUri is None and hasattr(topLevelNode, 'baseUri'):
topLevelNode.baseUri = forceBaseUri
doc.appendChild(topLevelNode)
if topLevelNode.attributes:
for attr in topLevelNode.attributes.values():
attr.ownerDocument = topLevelNode.ownerDocument
_UnpickleChildren(unpickler, topLevelNode, forceBaseUri)
return topLevelNode
finally:
g_lock.release()
## Helper function for unpickling ##
def _UnpickleChildren(unpickler, node, forceBaseUri=None):
children = unpickler.load()
while children:
child = unpickler.load()
if forceBaseUri is None and hasattr(child, 'baseUri'):
child.baseUri = forceBaseUri
node.appendChild(child)
if child.nodeType == Node.ELEMENT_NODE:
for attr in child.attributes:
attr.ownerDocument = child.ownerDocument
_UnpickleChildren(unpickler, child, forceBaseUri)
children = children - 1
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