+++ /dev/null
-#
-# ElementTree
-# $Id$
-#
-# light-weight XML support for Python 1.5.2 and later.
-#
-# history:
-# 2001-10-20 fl created (from various sources)
-# 2001-11-01 fl return root from parse method
-# 2002-02-16 fl sort attributes in lexical order
-# 2002-04-06 fl TreeBuilder refactoring, added PythonDoc markup
-# 2002-05-01 fl finished TreeBuilder refactoring
-# 2002-07-14 fl added basic namespace support to ElementTree.write
-# 2002-07-25 fl added QName attribute support
-# 2002-10-20 fl fixed encoding in write
-# 2002-11-24 fl changed default encoding to ascii; fixed attribute encoding
-# 2002-11-27 fl accept file objects or file names for parse/write
-# 2002-12-04 fl moved XMLTreeBuilder back to this module
-# 2003-01-11 fl fixed entity encoding glitch for us-ascii
-# 2003-02-13 fl added XML literal factory
-# 2003-02-21 fl added ProcessingInstruction/PI factory
-# 2003-05-11 fl added tostring/fromstring helpers
-# 2003-05-26 fl added ElementPath support
-# 2003-07-05 fl added makeelement factory method
-# 2003-07-28 fl added more well-known namespace prefixes
-# 2003-08-15 fl fixed typo in ElementTree.findtext (Thomas Dartsch)
-# 2003-09-04 fl fall back on emulator if ElementPath is not installed
-# 2003-10-31 fl markup updates
-# 2003-11-15 fl fixed nested namespace bug
-# 2004-03-28 fl added XMLID helper
-# 2004-06-02 fl added default support to findtext
-# 2004-06-08 fl fixed encoding of non-ascii element/attribute names
-# 2004-08-23 fl take advantage of post-2.1 expat features
-# 2005-02-01 fl added iterparse implementation
-# 2005-03-02 fl fixed iterparse support for pre-2.2 versions
-#
-# Copyright (c) 1999-2005 by Fredrik Lundh. All rights reserved.
-#
-# fredrik@pythonware.com
-# http://www.pythonware.com
-#
-# --------------------------------------------------------------------
-# The ElementTree toolkit is
-#
-# Copyright (c) 1999-2005 by Fredrik Lundh
-#
-# By obtaining, using, and/or copying this software and/or its
-# associated documentation, you agree that you have read, understood,
-# and will comply with the following terms and conditions:
-#
-# Permission to use, copy, modify, and distribute this software and
-# its associated documentation for any purpose and without fee is
-# hereby granted, provided that the above copyright notice appears in
-# all copies, and that both that copyright notice and this permission
-# notice appear in supporting documentation, and that the name of
-# Secret Labs AB or the author not be used in advertising or publicity
-# pertaining to distribution of the software without specific, written
-# prior permission.
-#
-# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
-# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
-# ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
-# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
-# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
-# OF THIS SOFTWARE.
-# --------------------------------------------------------------------
-
-__all__ = [
- # public symbols
- "Comment",
- "dump",
- "Element", "ElementTree",
- "fromstring",
- "iselement", "iterparse",
- "parse",
- "PI", "ProcessingInstruction",
- "QName",
- "SubElement",
- "tostring",
- "TreeBuilder",
- "VERSION", "XML",
- "XMLTreeBuilder",
- ]
-
-##
-# The <b>Element</b> type is a flexible container object, designed to
-# store hierarchical data structures in memory. The type can be
-# described as a cross between a list and a dictionary.
-# <p>
-# Each element has a number of properties associated with it:
-# <ul>
-# <li>a <i>tag</i>. This is a string identifying what kind of data
-# this element represents (the element type, in other words).</li>
-# <li>a number of <i>attributes</i>, stored in a Python dictionary.</li>
-# <li>a <i>text</i> string.</li>
-# <li>an optional <i>tail</i> string.</li>
-# <li>a number of <i>child elements</i>, stored in a Python sequence</li>
-# </ul>
-#
-# To create an element instance, use the {@link #Element} or {@link
-# #SubElement} factory functions.
-# <p>
-# The {@link #ElementTree} class can be used to wrap an element
-# structure, and convert it from and to XML.
-##
-
-import string, sys, re
-
-class _SimpleElementPath:
- # emulate pre-1.2 find/findtext/findall behaviour
- def find(self, element, tag):
- for elem in element:
- if elem.tag == tag:
- return elem
- return None
- def findtext(self, element, tag, default=None):
- for elem in element:
- if elem.tag == tag:
- return elem.text or ""
- return default
- def findall(self, element, tag):
- if tag[:3] == ".//":
- return element.getiterator(tag[3:])
- result = []
- for elem in element:
- if elem.tag == tag:
- result.append(elem)
- return result
-
-try:
- import ElementPath
-except ImportError:
- # FIXME: issue warning in this case?
- ElementPath = _SimpleElementPath()
-
-# TODO: add support for custom namespace resolvers/default namespaces
-# TODO: add improved support for incremental parsing
-
-VERSION = "1.2.6"
-
-##
-# Internal element class. This class defines the Element interface,
-# and provides a reference implementation of this interface.
-# <p>
-# You should not create instances of this class directly. Use the
-# appropriate factory functions instead, such as {@link #Element}
-# and {@link #SubElement}.
-#
-# @see Element
-# @see SubElement
-# @see Comment
-# @see ProcessingInstruction
-
-class _ElementInterface:
- # <tag attrib>text<child/>...</tag>tail
-
- ##
- # (Attribute) Element tag.
-
- tag = None
-
- ##
- # (Attribute) Element attribute dictionary. Where possible, use
- # {@link #_ElementInterface.get},
- # {@link #_ElementInterface.set},
- # {@link #_ElementInterface.keys}, and
- # {@link #_ElementInterface.items} to access
- # element attributes.
-
- attrib = None
-
- ##
- # (Attribute) Text before first subelement. This is either a
- # string or the value None, if there was no text.
-
- text = None
-
- ##
- # (Attribute) Text after this element's end tag, but before the
- # next sibling element's start tag. This is either a string or
- # the value None, if there was no text.
-
- tail = None # text after end tag, if any
-
- def __init__(self, tag, attrib):
- self.tag = tag
- self.attrib = attrib
- self._children = []
-
- def __repr__(self):
- return "<Element %s at %x>" % (self.tag, id(self))
-
- ##
- # Creates a new element object of the same type as this element.
- #
- # @param tag Element tag.
- # @param attrib Element attributes, given as a dictionary.
- # @return A new element instance.
-
- def makeelement(self, tag, attrib):
- return Element(tag, attrib)
-
- ##
- # Returns the number of subelements.
- #
- # @return The number of subelements.
-
- def __len__(self):
- return len(self._children)
-
- ##
- # Returns the given subelement.
- #
- # @param index What subelement to return.
- # @return The given subelement.
- # @exception IndexError If the given element does not exist.
-
- def __getitem__(self, index):
- return self._children[index]
-
- ##
- # Replaces the given subelement.
- #
- # @param index What subelement to replace.
- # @param element The new element value.
- # @exception IndexError If the given element does not exist.
- # @exception AssertionError If element is not a valid object.
-
- def __setitem__(self, index, element):
- assert iselement(element)
- self._children[index] = element
-
- ##
- # Deletes the given subelement.
- #
- # @param index What subelement to delete.
- # @exception IndexError If the given element does not exist.
-
- def __delitem__(self, index):
- del self._children[index]
-
- ##
- # Returns a list containing subelements in the given range.
- #
- # @param start The first subelement to return.
- # @param stop The first subelement that shouldn't be returned.
- # @return A sequence object containing subelements.
-
- def __getslice__(self, start, stop):
- return self._children[start:stop]
-
- ##
- # Replaces a number of subelements with elements from a sequence.
- #
- # @param start The first subelement to replace.
- # @param stop The first subelement that shouldn't be replaced.
- # @param elements A sequence object with zero or more elements.
- # @exception AssertionError If a sequence member is not a valid object.
-
- def __setslice__(self, start, stop, elements):
- for element in elements:
- assert iselement(element)
- self._children[start:stop] = list(elements)
-
- ##
- # Deletes a number of subelements.
- #
- # @param start The first subelement to delete.
- # @param stop The first subelement to leave in there.
-
- def __delslice__(self, start, stop):
- del self._children[start:stop]
-
- ##
- # Adds a subelement to the end of this element.
- #
- # @param element The element to add.
- # @exception AssertionError If a sequence member is not a valid object.
-
- def append(self, element):
- assert iselement(element)
- self._children.append(element)
-
- ##
- # Inserts a subelement at the given position in this element.
- #
- # @param index Where to insert the new subelement.
- # @exception AssertionError If the element is not a valid object.
-
- def insert(self, index, element):
- assert iselement(element)
- self._children.insert(index, element)
-
- ##
- # Removes a matching subelement. Unlike the <b>find</b> methods,
- # this method compares elements based on identity, not on tag
- # value or contents.
- #
- # @param element What element to remove.
- # @exception ValueError If a matching element could not be found.
- # @exception AssertionError If the element is not a valid object.
-
- def remove(self, element):
- assert iselement(element)
- self._children.remove(element)
-
- ##
- # Returns all subelements. The elements are returned in document
- # order.
- #
- # @return A list of subelements.
- # @defreturn list of Element instances
-
- def getchildren(self):
- return self._children
-
- ##
- # Finds the first matching subelement, by tag name or path.
- #
- # @param path What element to look for.
- # @return The first matching element, or None if no element was found.
- # @defreturn Element or None
-
- def find(self, path):
- return ElementPath.find(self, path)
-
- ##
- # Finds text for the first matching subelement, by tag name or path.
- #
- # @param path What element to look for.
- # @param default What to return if the element was not found.
- # @return The text content of the first matching element, or the
- # default value no element was found. Note that if the element
- # has is found, but has no text content, this method returns an
- # empty string.
- # @defreturn string
-
- def findtext(self, path, default=None):
- return ElementPath.findtext(self, path, default)
-
- ##
- # Finds all matching subelements, by tag name or path.
- #
- # @param path What element to look for.
- # @return A list or iterator containing all matching elements,
- # in document order.
- # @defreturn list of Element instances
-
- def findall(self, path):
- return ElementPath.findall(self, path)
-
- ##
- # Resets an element. This function removes all subelements, clears
- # all attributes, and sets the text and tail attributes to None.
-
- def clear(self):
- self.attrib.clear()
- self._children = []
- self.text = self.tail = None
-
- ##
- # Gets an element attribute.
- #
- # @param key What attribute to look for.
- # @param default What to return if the attribute was not found.
- # @return The attribute value, or the default value, if the
- # attribute was not found.
- # @defreturn string or None
-
- def get(self, key, default=None):
- return self.attrib.get(key, default)
-
- ##
- # Sets an element attribute.
- #
- # @param key What attribute to set.
- # @param value The attribute value.
-
- def set(self, key, value):
- self.attrib[key] = value
-
- ##
- # Gets a list of attribute names. The names are returned in an
- # arbitrary order (just like for an ordinary Python dictionary).
- #
- # @return A list of element attribute names.
- # @defreturn list of strings
-
- def keys(self):
- return list(self.attrib.keys())
-
- ##
- # Gets element attributes, as a sequence. The attributes are
- # returned in an arbitrary order.
- #
- # @return A list of (name, value) tuples for all attributes.
- # @defreturn list of (string, string) tuples
-
- def items(self):
- return list(self.attrib.items())
-
- ##
- # Creates a tree iterator. The iterator loops over this element
- # and all subelements, in document order, and returns all elements
- # with a matching tag.
- # <p>
- # If the tree structure is modified during iteration, the result
- # is undefined.
- #
- # @param tag What tags to look for (default is to return all elements).
- # @return A list or iterator containing all the matching elements.
- # @defreturn list or iterator
-
- def getiterator(self, tag=None):
- nodes = []
- if tag == "*":
- tag = None
- if tag is None or self.tag == tag:
- nodes.append(self)
- for node in self._children:
- nodes.extend(node.getiterator(tag))
- return nodes
-
-# compatibility
-_Element = _ElementInterface
-
-##
-# Element factory. This function returns an object implementing the
-# standard Element interface. The exact class or type of that object
-# is implementation dependent, but it will always be compatible with
-# the {@link #_ElementInterface} class in this module.
-# <p>
-# The element name, attribute names, and attribute values can be
-# either 8-bit ASCII strings or Unicode strings.
-#
-# @param tag The element name.
-# @param attrib An optional dictionary, containing element attributes.
-# @param **extra Additional attributes, given as keyword arguments.
-# @return An element instance.
-# @defreturn Element
-
-def Element(tag, attrib={}, **extra):
- attrib = attrib.copy()
- attrib.update(extra)
- return _ElementInterface(tag, attrib)
-
-##
-# Subelement factory. This function creates an element instance, and
-# appends it to an existing element.
-# <p>
-# The element name, attribute names, and attribute values can be
-# either 8-bit ASCII strings or Unicode strings.
-#
-# @param parent The parent element.
-# @param tag The subelement name.
-# @param attrib An optional dictionary, containing element attributes.
-# @param **extra Additional attributes, given as keyword arguments.
-# @return An element instance.
-# @defreturn Element
-
-def SubElement(parent, tag, attrib={}, **extra):
- attrib = attrib.copy()
- attrib.update(extra)
- element = parent.makeelement(tag, attrib)
- parent.append(element)
- return element
-
-##
-# Comment element factory. This factory function creates a special
-# element that will be serialized as an XML comment.
-# <p>
-# The comment string can be either an 8-bit ASCII string or a Unicode
-# string.
-#
-# @param text A string containing the comment string.
-# @return An element instance, representing a comment.
-# @defreturn Element
-
-def Comment(text=None):
- element = Element(Comment)
- element.text = text
- return element
-
-##
-# PI element factory. This factory function creates a special element
-# that will be serialized as an XML processing instruction.
-#
-# @param target A string containing the PI target.
-# @param text A string containing the PI contents, if any.
-# @return An element instance, representing a PI.
-# @defreturn Element
-
-def ProcessingInstruction(target, text=None):
- element = Element(ProcessingInstruction)
- element.text = target
- if text:
- element.text = element.text + " " + text
- return element
-
-PI = ProcessingInstruction
-
-##
-# QName wrapper. This can be used to wrap a QName attribute value, in
-# order to get proper namespace handling on output.
-#
-# @param text A string containing the QName value, in the form {uri}local,
-# or, if the tag argument is given, the URI part of a QName.
-# @param tag Optional tag. If given, the first argument is interpreted as
-# an URI, and this argument is interpreted as a local name.
-# @return An opaque object, representing the QName.
-
-class QName:
- def __init__(self, text_or_uri, tag=None):
- if tag:
- text_or_uri = "{%s}%s" % (text_or_uri, tag)
- self.text = text_or_uri
- def __str__(self):
- return self.text
- def __hash__(self):
- return hash(self.text)
- def __cmp__(self, other):
- if isinstance(other, QName):
- return cmp(self.text, other.text)
- return cmp(self.text, other)
-
-##
-# ElementTree wrapper class. This class represents an entire element
-# hierarchy, and adds some extra support for serialization to and from
-# standard XML.
-#
-# @param element Optional root element.
-# @keyparam file Optional file handle or name. If given, the
-# tree is initialized with the contents of this XML file.
-
-class ElementTree:
-
- def __init__(self, element=None, file=None):
- assert element is None or iselement(element)
- self._root = element # first node
- if file:
- self.parse(file)
-
- ##
- # Gets the root element for this tree.
- #
- # @return An element instance.
- # @defreturn Element
-
- def getroot(self):
- return self._root
-
- ##
- # Replaces the root element for this tree. This discards the
- # current contents of the tree, and replaces it with the given
- # element. Use with care.
- #
- # @param element An element instance.
-
- def _setroot(self, element):
- assert iselement(element)
- self._root = element
-
- ##
- # Loads an external XML document into this element tree.
- #
- # @param source A file name or file object.
- # @param parser An optional parser instance. If not given, the
- # standard {@link XMLTreeBuilder} parser is used.
- # @return The document root element.
- # @defreturn Element
-
- def parse(self, source, parser=None):
- if not hasattr(source, "read"):
- source = open(source, "rb")
- if not parser:
- parser = XMLTreeBuilder()
- while 1:
- data = source.read(32768)
- if not data:
- break
- parser.feed(data)
- self._root = parser.close()
- return self._root
-
- ##
- # Creates a tree iterator for the root element. The iterator loops
- # over all elements in this tree, in document order.
- #
- # @param tag What tags to look for (default is to return all elements)
- # @return An iterator.
- # @defreturn iterator
-
- def getiterator(self, tag=None):
- assert self._root is not None
- return self._root.getiterator(tag)
-
- ##
- # Finds the first toplevel element with given tag.
- # Same as getroot().find(path).
- #
- # @param path What element to look for.
- # @return The first matching element, or None if no element was found.
- # @defreturn Element or None
-
- def find(self, path):
- assert self._root is not None
- if path[:1] == "/":
- path = "." + path
- return self._root.find(path)
-
- ##
- # Finds the element text for the first toplevel element with given
- # tag. Same as getroot().findtext(path).
- #
- # @param path What toplevel element to look for.
- # @param default What to return if the element was not found.
- # @return The text content of the first matching element, or the
- # default value no element was found. Note that if the element
- # has is found, but has no text content, this method returns an
- # empty string.
- # @defreturn string
-
- def findtext(self, path, default=None):
- assert self._root is not None
- if path[:1] == "/":
- path = "." + path
- return self._root.findtext(path, default)
-
- ##
- # Finds all toplevel elements with the given tag.
- # Same as getroot().findall(path).
- #
- # @param path What element to look for.
- # @return A list or iterator containing all matching elements,
- # in document order.
- # @defreturn list of Element instances
-
- def findall(self, path):
- assert self._root is not None
- if path[:1] == "/":
- path = "." + path
- return self._root.findall(path)
-
- ##
- # Writes the element tree to a file, as XML.
- #
- # @param file A file name, or a file object opened for writing.
- # @param encoding Optional output encoding (default is US-ASCII).
-
- def write(self, file, encoding="us-ascii"):
- assert self._root is not None
- if not hasattr(file, "write"):
- file = open(file, "wb")
- if not encoding:
- encoding = "us-ascii"
- elif encoding != "utf-8" and encoding != "us-ascii":
- file.write("<?xml version='1.0' encoding='%s'?>\n" % encoding)
- self._write(file, self._root, encoding, {})
-
- def _write(self, file, node, encoding, namespaces):
- # write XML to file
- tag = node.tag
- if tag is Comment:
- file.write("<!-- %s -->" % _escape_cdata(node.text, encoding))
- elif tag is ProcessingInstruction:
- file.write("<?%s?>" % _escape_cdata(node.text, encoding))
- else:
- items = list(node.items())
- xmlns_items = [] # new namespaces in this scope
- try:
- if isinstance(tag, QName) or tag[:1] == "{":
- tag, xmlns = fixtag(tag, namespaces)
- if xmlns: xmlns_items.append(xmlns)
- except TypeError:
- _raise_serialization_error(tag)
- file.write("<" + _encode(tag, encoding))
- if items or xmlns_items:
- items.sort() # lexical order
- for k, v in items:
- try:
- if isinstance(k, QName) or k[:1] == "{":
- k, xmlns = fixtag(k, namespaces)
- if xmlns: xmlns_items.append(xmlns)
- except TypeError:
- _raise_serialization_error(k)
- try:
- if isinstance(v, QName):
- v, xmlns = fixtag(v, namespaces)
- if xmlns: xmlns_items.append(xmlns)
- except TypeError:
- _raise_serialization_error(v)
- file.write(" %s=\"%s\"" % (_encode(k, encoding),
- _escape_attrib(v, encoding)))
- for k, v in xmlns_items:
- file.write(" %s=\"%s\"" % (_encode(k, encoding),
- _escape_attrib(v, encoding)))
- if node.text or len(node):
- file.write(">")
- if node.text:
- file.write(_escape_cdata(node.text, encoding))
- for n in node:
- self._write(file, n, encoding, namespaces)
- file.write("</" + _encode(tag, encoding) + ">")
- else:
- file.write(" />")
- for k, v in xmlns_items:
- del namespaces[v]
- if node.tail:
- file.write(_escape_cdata(node.tail, encoding))
-
-# --------------------------------------------------------------------
-# helpers
-
-##
-# Checks if an object appears to be a valid element object.
-#
-# @param An element instance.
-# @return A true value if this is an element object.
-# @defreturn flag
-
-def iselement(element):
- # FIXME: not sure about this; might be a better idea to look
- # for tag/attrib/text attributes
- return isinstance(element, _ElementInterface) or hasattr(element, "tag")
-
-##
-# Writes an element tree or element structure to sys.stdout. This
-# function should be used for debugging only.
-# <p>
-# The exact output format is implementation dependent. In this
-# version, it's written as an ordinary XML file.
-#
-# @param elem An element tree or an individual element.
-
-def dump(elem):
- # debugging
- if not isinstance(elem, ElementTree):
- elem = ElementTree(elem)
- elem.write(sys.stdout)
- tail = elem.getroot().tail
- if not tail or tail[-1] != "\n":
- sys.stdout.write("\n")
-
-def _encode(s, encoding):
- try:
- return s.encode(encoding)
- except AttributeError:
- return s # 1.5.2: assume the string uses the right encoding
-
-if sys.version[:3] == "1.5":
- _escape = re.compile(r"[&<>\"\x80-\xff]+") # 1.5.2
-else:
- _escape = re.compile(eval(r'u"[&<>\"\u0080-\uffff]+"'))
-
-_escape_map = {
- "&": "&",
- "<": "<",
- ">": ">",
- '"': """,
-}
-
-_namespace_map = {
- # "well-known" namespace prefixes
- "http://www.w3.org/XML/1998/namespace": "xml",
- "http://www.w3.org/1999/xhtml": "html",
- "http://www.w3.org/1999/02/22-rdf-syntax-ns#": "rdf",
- "http://schemas.xmlsoap.org/wsdl/": "wsdl",
-}
-
-def _raise_serialization_error(text):
- raise TypeError(
- "cannot serialize %r (type %s)" % (text, type(text).__name__)
- )
-
-def _encode_entity(text, pattern=_escape):
- # map reserved and non-ascii characters to numerical entities
- def escape_entities(m, map=_escape_map):
- out = []
- append = out.append
- for char in m.group():
- text = map.get(char)
- if text is None:
- text = "&#%d;" % ord(char)
- append(text)
- return string.join(out, "")
- try:
- return _encode(pattern.sub(escape_entities, text), "ascii")
- except TypeError:
- _raise_serialization_error(text)
-
-#
-# the following functions assume an ascii-compatible encoding
-# (or "utf-16")
-
-def _escape_cdata(text, encoding=None, replace=string.replace):
- # escape character data
- try:
- if encoding:
- try:
- text = _encode(text, encoding)
- except UnicodeError:
- return _encode_entity(text)
- text = replace(text, "&", "&")
- text = replace(text, "<", "<")
- text = replace(text, ">", ">")
- return text
- except (TypeError, AttributeError):
- _raise_serialization_error(text)
-
-def _escape_attrib(text, encoding=None, replace=string.replace):
- # escape attribute value
- try:
- if encoding:
- try:
- text = _encode(text, encoding)
- except UnicodeError:
- return _encode_entity(text)
- text = replace(text, "&", "&")
- text = replace(text, "'", "'") # FIXME: overkill
- text = replace(text, "\"", """)
- text = replace(text, "<", "<")
- text = replace(text, ">", ">")
- return text
- except (TypeError, AttributeError):
- _raise_serialization_error(text)
-
-def fixtag(tag, namespaces):
- # given a decorated tag (of the form {uri}tag), return prefixed
- # tag and namespace declaration, if any
- if isinstance(tag, QName):
- tag = tag.text
- namespace_uri, tag = string.split(tag[1:], "}", 1)
- prefix = namespaces.get(namespace_uri)
- if prefix is None:
- prefix = _namespace_map.get(namespace_uri)
- if prefix is None:
- prefix = "ns%d" % len(namespaces)
- namespaces[namespace_uri] = prefix
- if prefix == "xml":
- xmlns = None
- else:
- xmlns = ("xmlns:%s" % prefix, namespace_uri)
- else:
- xmlns = None
- return "%s:%s" % (prefix, tag), xmlns
-
-##
-# Parses an XML document into an element tree.
-#
-# @param source A filename or file object containing XML data.
-# @param parser An optional parser instance. If not given, the
-# standard {@link XMLTreeBuilder} parser is used.
-# @return An ElementTree instance
-
-def parse(source, parser=None):
- tree = ElementTree()
- tree.parse(source, parser)
- return tree
-
-##
-# Parses an XML document into an element tree incrementally, and reports
-# what's going on to the user.
-#
-# @param source A filename or file object containing XML data.
-# @param events A list of events to report back. If omitted, only "end"
-# events are reported.
-# @return A (event, elem) iterator.
-
-class iterparse:
-
- def __init__(self, source, events=None):
- if not hasattr(source, "read"):
- source = open(source, "rb")
- self._file = source
- self._events = []
- self._index = 0
- self.root = self._root = None
- self._parser = XMLTreeBuilder()
- # wire up the parser for event reporting
- parser = self._parser._parser
- append = self._events.append
- if events is None:
- events = ["end"]
- for event in events:
- if event == "start":
- try:
- parser.ordered_attributes = 1
- parser.specified_attributes = 1
- def handler(tag, attrib_in, event=event, append=append,
- start=self._parser._start_list):
- append((event, start(tag, attrib_in)))
- parser.StartElementHandler = handler
- except AttributeError:
- def handler(tag, attrib_in, event=event, append=append,
- start=self._parser._start):
- append((event, start(tag, attrib_in)))
- parser.StartElementHandler = handler
- elif event == "end":
- def handler(tag, event=event, append=append,
- end=self._parser._end):
- append((event, end(tag)))
- parser.EndElementHandler = handler
- elif event == "start-ns":
- def handler(prefix, uri, event=event, append=append):
- try:
- uri = _encode(uri, "ascii")
- except UnicodeError:
- pass
- append((event, (prefix or "", uri)))
- parser.StartNamespaceDeclHandler = handler
- elif event == "end-ns":
- def handler(prefix, event=event, append=append):
- append((event, None))
- parser.EndNamespaceDeclHandler = handler
-
- def __next__(self):
- while 1:
- try:
- item = self._events[self._index]
- except IndexError:
- if self._parser is None:
- self.root = self._root
- try:
- raise StopIteration
- except NameError:
- raise IndexError
- # load event buffer
- del self._events[:]
- self._index = 0
- data = self._file.read(16384)
- if data:
- self._parser.feed(data)
- else:
- self._root = self._parser.close()
- self._parser = None
- else:
- self._index = self._index + 1
- return item
-
- try:
- iter
- def __iter__(self):
- return self
- except NameError:
- def __getitem__(self, index):
- return next(self)
-
-##
-# Parses an XML document from a string constant. This function can
-# be used to embed "XML literals" in Python code.
-#
-# @param source A string containing XML data.
-# @return An Element instance.
-# @defreturn Element
-
-def XML(text):
- parser = XMLTreeBuilder()
- parser.feed(text)
- return parser.close()
-
-##
-# Parses an XML document from a string constant, and also returns
-# a dictionary which maps from element id:s to elements.
-#
-# @param source A string containing XML data.
-# @return A tuple containing an Element instance and a dictionary.
-# @defreturn (Element, dictionary)
-
-def XMLID(text):
- parser = XMLTreeBuilder()
- parser.feed(text)
- tree = parser.close()
- ids = {}
- for elem in tree.getiterator():
- id = elem.get("id")
- if id:
- ids[id] = elem
- return tree, ids
-
-##
-# Parses an XML document from a string constant. Same as {@link #XML}.
-#
-# @def fromstring(text)
-# @param source A string containing XML data.
-# @return An Element instance.
-# @defreturn Element
-
-fromstring = XML
-
-##
-# Generates a string representation of an XML element, including all
-# subelements.
-#
-# @param element An Element instance.
-# @return An encoded string containing the XML data.
-# @defreturn string
-
-def tostring(element, encoding=None):
- class dummy:
- pass
- data = []
- file = dummy()
- file.write = data.append
- ElementTree(element).write(file, encoding)
- return string.join(data, "")
-
-##
-# Generic element structure builder. This builder converts a sequence
-# of {@link #TreeBuilder.start}, {@link #TreeBuilder.data}, and {@link
-# #TreeBuilder.end} method calls to a well-formed element structure.
-# <p>
-# You can use this class to build an element structure using a custom XML
-# parser, or a parser for some other XML-like format.
-#
-# @param element_factory Optional element factory. This factory
-# is called to create new Element instances, as necessary.
-
-class TreeBuilder:
-
- def __init__(self, element_factory=None):
- self._data = [] # data collector
- self._elem = [] # element stack
- self._last = None # last element
- self._tail = None # true if we're after an end tag
- if element_factory is None:
- element_factory = _ElementInterface
- self._factory = element_factory
-
- ##
- # Flushes the parser buffers, and returns the toplevel documen
- # element.
- #
- # @return An Element instance.
- # @defreturn Element
-
- def close(self):
- assert len(self._elem) == 0, "missing end tags"
- assert self._last != None, "missing toplevel element"
- return self._last
-
- def _flush(self):
- if self._data:
- if self._last is not None:
- text = string.join(self._data, "")
- if self._tail:
- assert self._last.tail is None, "internal error (tail)"
- self._last.tail = text
- else:
- assert self._last.text is None, "internal error (text)"
- self._last.text = text
- self._data = []
-
- ##
- # Adds text to the current element.
- #
- # @param data A string. This should be either an 8-bit string
- # containing ASCII text, or a Unicode string.
-
- def data(self, data):
- self._data.append(data)
-
- ##
- # Opens a new element.
- #
- # @param tag The element name.
- # @param attrib A dictionary containing element attributes.
- # @return The opened element.
- # @defreturn Element
-
- def start(self, tag, attrs):
- self._flush()
- self._last = elem = self._factory(tag, attrs)
- if self._elem:
- self._elem[-1].append(elem)
- self._elem.append(elem)
- self._tail = 0
- return elem
-
- ##
- # Closes the current element.
- #
- # @param tag The element name.
- # @return The closed element.
- # @defreturn Element
-
- def end(self, tag):
- self._flush()
- self._last = self._elem.pop()
- assert self._last.tag == tag,\
- "end tag mismatch (expected %s, got %s)" % (
- self._last.tag, tag)
- self._tail = 1
- return self._last
-
-##
-# Element structure builder for XML source data, based on the
-# <b>expat</b> parser.
-#
-# @keyparam target Target object. If omitted, the builder uses an
-# instance of the standard {@link #TreeBuilder} class.
-# @keyparam html Predefine HTML entities. This flag is not supported
-# by the current implementation.
-# @see #ElementTree
-# @see #TreeBuilder
-
-class XMLTreeBuilder:
-
- def __init__(self, html=0, target=None):
- try:
- from xml.parsers import expat
- except ImportError:
- raise ImportError(
- "No module named expat; use SimpleXMLTreeBuilder instead"
- )
- self._parser = parser = expat.ParserCreate(None, "}")
- if target is None:
- target = TreeBuilder()
- self._target = target
- self._names = {} # name memo cache
- # callbacks
- parser.DefaultHandlerExpand = self._default
- parser.StartElementHandler = self._start
- parser.EndElementHandler = self._end
- parser.CharacterDataHandler = self._data
- # let expat do the buffering, if supported
- try:
- self._parser.buffer_text = 1
- except AttributeError:
- pass
- # use new-style attribute handling, if supported
- try:
- self._parser.ordered_attributes = 1
- self._parser.specified_attributes = 1
- parser.StartElementHandler = self._start_list
- except AttributeError:
- pass
- encoding = None
- if not parser.returns_unicode:
- encoding = "utf-8"
- # target.xml(encoding, None)
- self._doctype = None
- self.entity = {}
-
- def _fixtext(self, text):
- # convert text string to ascii, if possible
- try:
- return _encode(text, "ascii")
- except UnicodeError:
- return text
-
- def _fixname(self, key):
- # expand qname, and convert name string to ascii, if possible
- try:
- name = self._names[key]
- except KeyError:
- name = key
- if "}" in name:
- name = "{" + name
- self._names[key] = name = self._fixtext(name)
- return name
-
- def _start(self, tag, attrib_in):
- fixname = self._fixname
- tag = fixname(tag)
- attrib = {}
- for key, value in list(attrib_in.items()):
- attrib[fixname(key)] = self._fixtext(value)
- return self._target.start(tag, attrib)
-
- def _start_list(self, tag, attrib_in):
- fixname = self._fixname
- tag = fixname(tag)
- attrib = {}
- if attrib_in:
- for i in range(0, len(attrib_in), 2):
- attrib[fixname(attrib_in[i])] = self._fixtext(attrib_in[i+1])
- return self._target.start(tag, attrib)
-
- def _data(self, text):
- return self._target.data(self._fixtext(text))
-
- def _end(self, tag):
- return self._target.end(self._fixname(tag))
-
- def _default(self, text):
- prefix = text[:1]
- if prefix == "&":
- # deal with undefined entities
- try:
- self._target.data(self.entity[text[1:-1]])
- except KeyError:
- from xml.parsers import expat
- raise expat.error(
- "undefined entity %s: line %d, column %d" %
- (text, self._parser.ErrorLineNumber,
- self._parser.ErrorColumnNumber)
- )
- elif prefix == "<" and text[:9] == "<!DOCTYPE":
- self._doctype = [] # inside a doctype declaration
- elif self._doctype is not None:
- # parse doctype contents
- if prefix == ">":
- self._doctype = None
- return
- text = string.strip(text)
- if not text:
- return
- self._doctype.append(text)
- n = len(self._doctype)
- if n > 2:
- type = self._doctype[1]
- if type == "PUBLIC" and n == 4:
- name, type, pubid, system = self._doctype
- elif type == "SYSTEM" and n == 3:
- name, type, system = self._doctype
- pubid = None
- else:
- return
- if pubid:
- pubid = pubid[1:-1]
- self.doctype(name, pubid, system[1:-1])
- self._doctype = None
-
- ##
- # Handles a doctype declaration.
- #
- # @param name Doctype name.
- # @param pubid Public identifier.
- # @param system System identifier.
-
- def doctype(self, name, pubid, system):
- pass
-
- ##
- # Feeds data to the parser.
- #
- # @param data Encoded data.
-
- def feed(self, data):
- self._parser.Parse(data, 0)
-
- ##
- # Finishes feeding data to the parser.
- #
- # @return An element structure.
- # @defreturn Element
-
- def close(self):
- self._parser.Parse("", 1) # end of data
- tree = self._target.close()
- del self._target, self._parser # get rid of circular references
- return tree
