import libxml2mod
import types
import sys
# The root of all libxml2 errors.
class libxmlError(Exception): pass
# Type of the wrapper class for the C objects wrappers
def checkWrapper(obj):
try:
n = type(_obj).__name__
if n != 'PyCObject' and n != 'PyCapsule':
return 1
except:
return 0
return 0
#
# id() is sometimes negative ...
#
def pos_id(o):
i = id(o)
if (i < 0):
return (sys.maxsize - i)
return i
#
# Errors raised by the wrappers when some tree handling failed.
#
class treeError(libxmlError):
def __init__(self, msg):
self.msg = msg
def __str__(self):
return self.msg
class parserError(libxmlError):
def __init__(self, msg):
self.msg = msg
def __str__(self):
return self.msg
class uriError(libxmlError):
def __init__(self, msg):
self.msg = msg
def __str__(self):
return self.msg
class xpathError(libxmlError):
def __init__(self, msg):
self.msg = msg
def __str__(self):
return self.msg
class ioWrapper:
def __init__(self, _obj):
self.__io = _obj
self._o = None
def io_close(self):
if self.__io == None:
return(-1)
self.__io.close()
self.__io = None
return(0)
def io_flush(self):
if self.__io == None:
return(-1)
self.__io.flush()
return(0)
def io_read(self, len = -1):
if self.__io == None:
return(-1)
try:
if len < 0:
ret = self.__io.read()
else:
ret = self.__io.read(len)
except Exception:
import sys
e = sys.exc_info()[1]
print("failed to read from Python:", type(e))
print("on IO:", self.__io)
self.__io == None
return(-1)
return(ret)
def io_write(self, str, len = -1):
if self.__io == None:
return(-1)
if len < 0:
return(self.__io.write(str))
return(self.__io.write(str, len))
class ioReadWrapper(ioWrapper):
def __init__(self, _obj, enc = ""):
ioWrapper.__init__(self, _obj)
self._o = libxml2mod.xmlCreateInputBuffer(self, enc)
def __del__(self):
print("__del__")
self.io_close()
if self._o != None:
libxml2mod.xmlFreeParserInputBuffer(self._o)
self._o = None
def close(self):
self.io_close()
if self._o != None:
libxml2mod.xmlFreeParserInputBuffer(self._o)
self._o = None
class ioWriteWrapper(ioWrapper):
def __init__(self, _obj, enc = ""):
# print "ioWriteWrapper.__init__", _obj
if type(_obj) == type(''):
print("write io from a string")
self.o = None
elif type(_obj).__name__ == 'PyCapsule':
file = libxml2mod.outputBufferGetPythonFile(_obj)
if file != None:
ioWrapper.__init__(self, file)
else:
ioWrapper.__init__(self, _obj)
self._o = _obj
# elif type(_obj) == types.InstanceType:
# print(("write io from instance of %s" % (_obj.__class__)))
# ioWrapper.__init__(self, _obj)
# self._o = libxml2mod.xmlCreateOutputBuffer(self, enc)
else:
file = libxml2mod.outputBufferGetPythonFile(_obj)
if file != None:
ioWrapper.__init__(self, file)
else:
ioWrapper.__init__(self, _obj)
self._o = _obj
def __del__(self):
# print "__del__"
self.io_close()
if self._o != None:
libxml2mod.xmlOutputBufferClose(self._o)
self._o = None
def flush(self):
self.io_flush()
if self._o != None:
libxml2mod.xmlOutputBufferClose(self._o)
self._o = None
def close(self):
self.io_flush()
if self._o != None:
libxml2mod.xmlOutputBufferClose(self._o)
self._o = None
#
# Example of a class to handle SAX events
#
class SAXCallback:
"""Base class for SAX handlers"""
def startDocument(self):
"""called at the start of the document"""
pass
def endDocument(self):
"""called at the end of the document"""
pass
def startElement(self, tag, attrs):
"""called at the start of every element, tag is the name of
the element, attrs is a dictionary of the element's attributes"""
pass
def endElement(self, tag):
"""called at the start of every element, tag is the name of
the element"""
pass
def characters(self, data):
"""called when character data have been read, data is the string
containing the data, multiple consecutive characters() callback
are possible."""
pass
def cdataBlock(self, data):
"""called when CDATA section have been read, data is the string
containing the data, multiple consecutive cdataBlock() callback
are possible."""
pass
def reference(self, name):
"""called when an entity reference has been found"""
pass
def ignorableWhitespace(self, data):
"""called when potentially ignorable white spaces have been found"""
pass
def processingInstruction(self, target, data):
"""called when a PI has been found, target contains the PI name and
data is the associated data in the PI"""
pass
def comment(self, content):
"""called when a comment has been found, content contains the comment"""
pass
def externalSubset(self, name, externalID, systemID):
"""called when a DOCTYPE declaration has been found, name is the
DTD name and externalID, systemID are the DTD public and system
identifier for that DTd if available"""
pass
def internalSubset(self, name, externalID, systemID):
"""called when a DOCTYPE declaration has been found, name is the
DTD name and externalID, systemID are the DTD public and system
identifier for that DTD if available"""
pass
def entityDecl(self, name, type, externalID, systemID, content):
"""called when an ENTITY declaration has been found, name is the
entity name and externalID, systemID are the entity public and
system identifier for that entity if available, type indicates
the entity type, and content reports it's string content"""
pass
def notationDecl(self, name, externalID, systemID):
"""called when an NOTATION declaration has been found, name is the
notation name and externalID, systemID are the notation public and
system identifier for that notation if available"""
pass
def attributeDecl(self, elem, name, type, defi, defaultValue, nameList):
"""called when an ATTRIBUTE definition has been found"""
pass
def elementDecl(self, name, type, content):
"""called when an ELEMENT definition has been found"""
pass
def entityDecl(self, name, publicId, systemID, notationName):
"""called when an unparsed ENTITY declaration has been found,
name is the entity name and publicId,, systemID are the entity
public and system identifier for that entity if available,
and notationName indicate the associated NOTATION"""
pass
def warning(self, msg):
#print msg
pass
def error(self, msg):
raise parserError(msg)
def fatalError(self, msg):
raise parserError(msg)
#
# This class is the ancestor of all the Node classes. It provides
# the basic functionalities shared by all nodes (and handle
# gracefylly the exception), like name, navigation in the tree,
# doc reference, content access and serializing to a string or URI
#
class xmlCore:
def __init__(self, _obj=None):
if _obj != None:
self._o = _obj;
return
self._o = None
def __eq__(self, other):
if other == None:
return False
ret = libxml2mod.compareNodesEqual(self._o, other._o)
if ret == None:
return False
return ret == True
def __ne__(self, other):
if other == None:
return True
ret = libxml2mod.compareNodesEqual(self._o, other._o)
return not ret
def __hash__(self):
ret = libxml2mod.nodeHash(self._o)
return ret
def __str__(self):
return self.serialize()
def get_parent(self):
ret = libxml2mod.parent(self._o)
if ret == None:
return None
return nodeWrap(ret)
def get_children(self):
ret = libxml2mod.children(self._o)
if ret == None:
return None
return nodeWrap(ret)
def get_last(self):
ret = libxml2mod.last(self._o)
if ret == None:
return None
return nodeWrap(ret)
def get_next(self):
ret = libxml2mod.next(self._o)
if ret == None:
return None
return nodeWrap(ret)
def get_properties(self):
ret = libxml2mod.properties(self._o)
if ret == None:
return None
return xmlAttr(_obj=ret)
def get_prev(self):
ret = libxml2mod.prev(self._o)
if ret == None:
return None
return nodeWrap(ret)
def get_content(self):
return libxml2mod.xmlNodeGetContent(self._o)
getContent = get_content # why is this duplicate naming needed ?
def get_name(self):
return libxml2mod.name(self._o)
def get_type(self):
return libxml2mod.type(self._o)
def get_doc(self):
ret = libxml2mod.doc(self._o)
if ret == None:
if self.type in ["document_xml", "document_html"]:
return xmlDoc(_obj=self._o)
else:
return None
return xmlDoc(_obj=ret)
#
# Those are common attributes to nearly all type of nodes
# defined as python2 properties
#
import sys
if float(sys.version[0:3]) < 2.2:
def __getattr__(self, attr):
if attr == "parent":
ret = libxml2mod.parent(self._o)
if ret == None:
return None
return nodeWrap(ret)
elif attr == "properties":
ret = libxml2mod.properties(self._o)
if ret == None:
return None
return xmlAttr(_obj=ret)
elif attr == "children":
ret = libxml2mod.children(self._o)
if ret == None:
return None
return nodeWrap(ret)
elif attr == "last":
ret = libxml2mod.last(self._o)
if ret == None:
return None
return nodeWrap(ret)
elif attr == "next":
ret = libxml2mod.next(self._o)
if ret == None:
return None
return nodeWrap(ret)
elif attr == "prev":
ret = libxml2mod.prev(self._o)
if ret == None:
return None
return nodeWrap(ret)
elif attr == "content":
return libxml2mod.xmlNodeGetContent(self._o)
elif attr == "name":
return libxml2mod.name(self._o)
elif attr == "type":
return libxml2mod.type(self._o)
elif attr == "doc":
ret = libxml2mod.doc(self._o)
if ret == None:
if self.type == "document_xml" or self.type == "document_html":
return xmlDoc(_obj=self._o)
else:
return None
return xmlDoc(_obj=ret)
raise AttributeError(attr)
else:
parent = property(get_parent, None, None, "Parent node")
children = property(get_children, None, None, "First child node")
last = property(get_last, None, None, "Last sibling node")
next = property(get_next, None, None, "Next sibling node")
prev = property(get_prev, None, None, "Previous sibling node")
properties = property(get_properties, None, None, "List of properties")
content = property(get_content, None, None, "Content of this node")
name = property(get_name, None, None, "Node name")
type = property(get_type, None, None, "Node type")
doc = property(get_doc, None, None, "The document this node belongs to")
#
# Serialization routines, the optional arguments have the following
# meaning:
# encoding: string to ask saving in a specific encoding
# indent: if 1 the serializer is asked to indent the output
#
def serialize(self, encoding = None, format = 0):
return libxml2mod.serializeNode(self._o, encoding, format)
def saveTo(self, file, encoding = None, format = 0):
return libxml2mod.saveNodeTo(self._o, file, encoding, format)
#
# Canonicalization routines:
#
# nodes: the node set (tuple or list) to be included in the
# canonized image or None if all document nodes should be
# included.
# exclusive: the exclusive flag (0 - non-exclusive
# canonicalization; otherwise - exclusive canonicalization)
# prefixes: the list of inclusive namespace prefixes (strings),
# or None if there is no inclusive namespaces (only for
# exclusive canonicalization, ignored otherwise)
# with_comments: include comments in the result (!=0) or not
# (==0)
def c14nMemory(self,
nodes=None,
exclusive=0,
prefixes=None,
with_comments=0):
if nodes:
nodes = [n._o for n in nodes]
return libxml2mod.xmlC14NDocDumpMemory(
self.get_doc()._o,
nodes,
exclusive != 0,
prefixes,
with_comments != 0)
def c14nSaveTo(self,
file,
nodes=None,
exclusive=0,
prefixes=None,
with_comments=0):
if nodes:
nodes = [n._o for n in nodes]
return libxml2mod.xmlC14NDocSaveTo(
self.get_doc()._o,
nodes,
exclusive != 0,
prefixes,
with_comments != 0,
file)
#
# Selecting nodes using XPath, a bit slow because the context
# is allocated/freed every time but convenient.
#
def xpathEval(self, expr):
doc = self.doc
if doc == None:
return None
ctxt = doc.xpathNewContext()
ctxt.setContextNode(self)
res = ctxt.xpathEval(expr)
ctxt.xpathFreeContext()
return res
# #
# # Selecting nodes using XPath, faster because the context
# # is allocated just once per xmlDoc.
# #
# # Removed: DV memleaks c.f. #126735
# #
# def xpathEval2(self, expr):
# doc = self.doc
# if doc == None:
# return None
# try:
# doc._ctxt.setContextNode(self)
# except:
# doc._ctxt = doc.xpathNewContext()
# doc._ctxt.setContextNode(self)
# res = doc._ctxt.xpathEval(expr)
# return res
def xpathEval2(self, expr):
return self.xpathEval(expr)
# Remove namespaces
def removeNsDef(self, href):
"""
Remove a namespace definition from a node. If href is None,
remove all of the ns definitions on that node. The removed
namespaces are returned as a linked list.
Note: If any child nodes referred to the removed namespaces,
they will be left with dangling links. You should call
renconciliateNs() to fix those pointers.
Note: This method does not free memory taken by the ns
definitions. You will need to free it manually with the
freeNsList() method on the returns xmlNs object.
"""
ret = libxml2mod.xmlNodeRemoveNsDef(self._o, href)
if ret is None:return None
__tmp = xmlNs(_obj=ret)
return __tmp
# support for python2 iterators
def walk_depth_first(self):
return xmlCoreDepthFirstItertor(self)
def walk_breadth_first(self):
return xmlCoreBreadthFirstItertor(self)
__iter__ = walk_depth_first
def free(self):
try:
self.doc._ctxt.xpathFreeContext()
except:
pass
libxml2mod.xmlFreeDoc(self._o)
#
# implements the depth-first iterator for libxml2 DOM tree
#
class xmlCoreDepthFirstItertor:
def __init__(self, node):
self.node = node
self.parents = []
def __iter__(self):
return self
def __next__(self):
while 1:
if self.node:
ret = self.node
self.parents.append(self.node)
self.node = self.node.children
return ret
try:
parent = self.parents.pop()
except IndexError:
raise StopIteration
self.node = parent.next
next = __next__
#
# implements the breadth-first iterator for libxml2 DOM tree
#
class xmlCoreBreadthFirstItertor:
def __init__(self, node):
self.node = node
self.parents = []
def __iter__(self):
return self
def __next__(self):
while 1:
if self.node:
ret = self.node
self.parents.append(self.node)
self.node = self.node.next
return ret
try:
parent = self.parents.pop()
except IndexError:
raise StopIteration
self.node = parent.children
next = __next__
#
# converters to present a nicer view of the XPath returns
#
def nodeWrap(o):
# TODO try to cast to the most appropriate node class
name = libxml2mod.type(o)
if name == "element" or name == "text":
return xmlNode(_obj=o)
if name == "attribute":
return xmlAttr(_obj=o)
if name[0:8] == "document":
return xmlDoc(_obj=o)
if name == "namespace":
return xmlNs(_obj=o)
if name == "elem_decl":
return xmlElement(_obj=o)
if name == "attribute_decl":
return xmlAttribute(_obj=o)
if name == "entity_decl":
return xmlEntity(_obj=o)
if name == "dtd":
return xmlDtd(_obj=o)
return xmlNode(_obj=o)
def xpathObjectRet(o):
otype = type(o)
if otype == type([]):
ret = list(map(xpathObjectRet, o))
return ret
elif otype == type(()):
ret = list(map(xpathObjectRet, o))
return tuple(ret)
elif otype == type('') or otype == type(0) or otype == type(0.0):
return o
else:
return nodeWrap(o)
#
# register an XPath function
#
def registerXPathFunction(ctxt, name, ns_uri, f):
ret = libxml2mod.xmlRegisterXPathFunction(ctxt, name, ns_uri, f)
#
# For the xmlTextReader parser configuration
#
PARSER_LOADDTD=1
PARSER_DEFAULTATTRS=2
PARSER_VALIDATE=3
PARSER_SUBST_ENTITIES=4
#
# For the error callback severities
#
PARSER_SEVERITY_VALIDITY_WARNING=1
PARSER_SEVERITY_VALIDITY_ERROR=2
PARSER_SEVERITY_WARNING=3
PARSER_SEVERITY_ERROR=4
#
# register the libxml2 error handler
#
def registerErrorHandler(f, ctx):
"""Register a Python written function to for error reporting.
The function is called back as f(ctx, error). """
import sys
if 'libxslt' not in sys.modules:
# normal behaviour when libxslt is not imported
ret = libxml2mod.xmlRegisterErrorHandler(f,ctx)
else:
# when libxslt is already imported, one must
# use libxst's error handler instead
import libxslt
ret = libxslt.registerErrorHandler(f,ctx)
return ret
class parserCtxtCore:
def __init__(self, _obj=None):
if _obj != None:
self._o = _obj;
return
self._o = None
def __del__(self):
if self._o != None:
libxml2mod.xmlFreeParserCtxt(self._o)
self._o = None
def setErrorHandler(self,f,arg):
"""Register an error handler that will be called back as
f(arg,msg,severity,reserved).
@reserved is currently always None."""
libxml2mod.xmlParserCtxtSetErrorHandler(self._o,f,arg)
def getErrorHandler(self):
"""Return (f,arg) as previously registered with setErrorHandler
or (None,None)."""
return libxml2mod.xmlParserCtxtGetErrorHandler(self._o)
def addLocalCatalog(self, uri):
"""Register a local catalog with the parser"""
return libxml2mod.addLocalCatalog(self._o, uri)
class ValidCtxtCore:
def __init__(self, *args, **kw):
pass
def setValidityErrorHandler(self, err_func, warn_func, arg=None):
"""
Register error and warning handlers for DTD validation.
These will be called back as f(msg,arg)
"""
libxml2mod.xmlSetValidErrors(self._o, err_func, warn_func, arg)
class SchemaValidCtxtCore:
def __init__(self, *args, **kw):
pass
def setValidityErrorHandler(self, err_func, warn_func, arg=None):
"""
Register error and warning handlers for Schema validation.
These will be called back as f(msg,arg)
"""
libxml2mod.xmlSchemaSetValidErrors(self._o, err_func, warn_func, arg)
class relaxNgValidCtxtCore:
def __init__(self, *args, **kw):
pass
def setValidityErrorHandler(self, err_func, warn_func, arg=None):
"""
Register error and warning handlers for RelaxNG validation.
These will be called back as f(msg,arg)
"""
libxml2mod.xmlRelaxNGSetValidErrors(self._o, err_func, warn_func, arg)
def _xmlTextReaderErrorFunc(xxx_todo_changeme,msg,severity,locator):
"""Intermediate callback to wrap the locator"""
(f,arg) = xxx_todo_changeme
return f(arg,msg,severity,xmlTextReaderLocator(locator))
class xmlTextReaderCore:
def __init__(self, _obj=None):
self.input = None
if _obj != None:self._o = _obj;return
self._o = None
def __del__(self):
if self._o != None:
libxml2mod.xmlFreeTextReader(self._o)
self._o = None
def SetErrorHandler(self,f,arg):
"""Register an error handler that will be called back as
f(arg,msg,severity,locator)."""
if f is None:
libxml2mod.xmlTextReaderSetErrorHandler(\
self._o,None,None)
else:
libxml2mod.xmlTextReaderSetErrorHandler(\
self._o,_xmlTextReaderErrorFunc,(f,arg))
def GetErrorHandler(self):
"""Return (f,arg) as previously registered with setErrorHandler
or (None,None)."""
f,arg = libxml2mod.xmlTextReaderGetErrorHandler(self._o)
if f is None:
return None,None
else:
# assert f is _xmlTextReaderErrorFunc
return arg
#
# The cleanup now goes though a wrapper in libxml.c
#
def cleanupParser():
libxml2mod.xmlPythonCleanupParser()
#
# The interface to xmlRegisterInputCallbacks.
# Since this API does not allow to pass a data object along with
# match/open callbacks, it is necessary to maintain a list of all
# Python callbacks.
#
__input_callbacks = []
def registerInputCallback(func):
def findOpenCallback(URI):
for cb in reversed(__input_callbacks):
o = cb(URI)
if o is not None:
return o
libxml2mod.xmlRegisterInputCallback(findOpenCallback)
__input_callbacks.append(func)
def popInputCallbacks():
# First pop python-level callbacks, when no more available - start
# popping built-in ones.
if len(__input_callbacks) > 0:
__input_callbacks.pop()
if len(__input_callbacks) == 0:
libxml2mod.xmlUnregisterInputCallback()
# WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
#
# Everything before this line comes from libxml.py
# Everything after this line is automatically generated
#
# WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
