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|
########################################################################
#
# File Name: ParsedNodeTest.py
#
#
"""
A Parsed Token that represents a node test.
WWW: http://4suite.org/XPATH e-mail: support@4suite.org
Copyright (c) 2000-2001 Fourthought Inc, USA. All Rights Reserved.
See http://4suite.org/COPYRIGHT for license and copyright information
"""
import string
from xml.dom import Node,EMPTY_NAMESPACE
from xml.xpath import NamespaceNode
from xml.xpath import NAMESPACE_NODE, RuntimeException
from xml.xpath import g_xpathRecognizedNodes
def ParsedNameTest(name):
if name == '*':
return PrincipalTypeTest()
index = string.find(name, ':')
if name[index:] == ':*':
return LocalNameTest(name[:index])
elif index >= 0:
return QualifiedNameTest(name[:index], name[index+1:])
return NodeNameTest(name)
def ParsedNodeTest(test, literal=None):
if literal:
if test != 'processing-instruction':
raise SyntaxError('Literal only allowed in processing-instruction')
return ProcessingInstructionNodeTest(literal)
return g_classMap[test]()
class NodeTestBase:
def match(self, context, node, principalType=Node.ELEMENT_NODE):
"""
The principalType is discussed in section [2.3 Node Tests]
of the XPath 1.0 spec. Only attribute and namespace axes
differ from the default of elements.
"""
return 0
def pprint(self, indent):
print indent + str(self)
def __str__(self):
return '<%s at %x: %s>' % (
self.__class__.__name__,
id(self),
repr(self),
)
class NodeTest(NodeTestBase):
def __init__(self):
self.priority = -0.5
def match(self, context, node, principalType=Node.ELEMENT_NODE):
return node.nodeType in g_xpathRecognizedNodes or isinstance(node,NamespaceNode.NamespaceNode)
def __repr__(self):
return 'node()'
class CommentNodeTest(NodeTestBase):
def __init__(self):
self.priority = -0.5
def match(self, context, node, principalType=Node.ELEMENT_NODE):
return node.nodeType == Node.COMMENT_NODE
def __repr__(self):
return 'comment()'
class TextNodeTest(NodeTestBase):
def __init__(self):
self.priority = -0.5
def match(self, context, node, principalType=Node.ELEMENT_NODE):
return node.nodeType in [Node.TEXT_NODE, Node.CDATA_SECTION_NODE]
def __repr__(self):
return 'text()'
class ProcessingInstructionNodeTest(NodeTestBase):
def __init__(self, target=None):
if target:
self.priority = 0
if target[0] not in ['"', "'"]:
raise SyntaxError("Invalid literal: %s" % target)
self.target = target[1:-1]
else:
self.priority = -0.5
self.target = ''
def match(self, context, node, principalType=Node.ELEMENT_NODE):
if node.nodeType != Node.PROCESSING_INSTRUCTION_NODE:
return 0
if self.target:
return self.target == node.target
return 1
def __repr__(self):
if self.target:
target = repr(self.target)
else:
target = ''
return 'processing-instruction(%s)' % target
# Name tests
class PrincipalTypeTest(NodeTestBase):
def __init__(self):
self.priority = -0.5
def match(self, context, node, principalType=Node.ELEMENT_NODE):
return node.nodeType == principalType
def __repr__(self):
return '*'
class NodeNameTest(NodeTestBase):
def __init__(self, nodeName):
self.priority = 0
self._nodeName = nodeName
def match(self, context, node, principalType=Node.ELEMENT_NODE):
if node.nodeType == principalType:
return node.nodeName == self._nodeName
return 0
def __repr__(self):
return self._nodeName
class LocalNameTest(NodeTestBase):
def __init__(self, prefix):
self.priority = -0.25
self._prefix = prefix
def match(self, context, node, principalType=Node.ELEMENT_NODE):
if node.nodeType != principalType:
return 0
try:
uri = self._prefix and context.processorNss[self._prefix] or EMPTY_NAMESPACE
except KeyError:
raise RuntimeException(RuntimeException.UNDEFINED_PREFIX,
self._prefix)
return node.namespaceURI == uri
def __repr__(self):
return self._prefix + ':*'
class QualifiedNameTest(NodeTestBase):
def __init__(self, prefix, localName):
self.priority = 0
self._prefix = prefix
self._localName = localName
def match(self, context, node, principalType=Node.ELEMENT_NODE):
if node.nodeType == principalType:
if node.localName == self._localName:
try:
return node.namespaceURI == context.processorNss[self._prefix]
except KeyError:
raise RuntimeException(RuntimeException.UNDEFINED_PREFIX,
self._prefix)
return 0
def __repr__(self):
return self._prefix + ':' + self._localName
g_classMap = {
'node' : NodeTest,
'comment' : CommentNodeTest,
'text' : TextNodeTest,
'processing-instruction' : ProcessingInstructionNodeTest,
}
|
