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authorMartin v. Löwis <martin@v.loewis.de>2003-01-25 15:29:56 (GMT)
committerMartin v. Löwis <martin@v.loewis.de>2003-01-25 15:29:56 (GMT)
commit9ea67889dc8fecbd2e57e2c3a5a65f1f69b7c1dc (patch)
tree36411a47c91cdaa93edcd165c4dd32335a996cf8 /Lib/xml
parent787354c3b99c9a0c5fdbdd33d29f58ef26df379f (diff)
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Import from PyXML 1.10.
Diffstat (limited to 'Lib/xml')
-rw-r--r--Lib/xml/dom/xmlbuilder.py388
1 files changed, 388 insertions, 0 deletions
diff --git a/Lib/xml/dom/xmlbuilder.py b/Lib/xml/dom/xmlbuilder.py
new file mode 100644
index 0000000..fd43c37
--- /dev/null
+++ b/Lib/xml/dom/xmlbuilder.py
@@ -0,0 +1,388 @@
+"""Implementation of the DOM Level 3 'LS-Load' feature."""
+
+import copy
+import xml.dom
+
+from xml.dom.minicompat import *
+
+from xml.dom.NodeFilter import NodeFilter
+
+
+__all__ = ["DOMBuilder", "DOMEntityResolver", "DOMInputSource"]
+
+
+class Options:
+ """Features object that has variables set for each DOMBuilder feature.
+
+ The DOMBuilder class uses an instance of this class to pass settings to
+ the ExpatBuilder class.
+ """
+
+ # Note that the DOMBuilder class in LoadSave constrains which of these
+ # values can be set using the DOM Level 3 LoadSave feature.
+
+ namespaces = 1
+ namespace_declarations = True
+ validation = False
+ external_parameter_entities = True
+ external_general_entities = True
+ external_dtd_subset = True
+ validate_if_schema = False
+ validate = False
+ datatype_normalization = False
+ create_entity_ref_nodes = True
+ entities = True
+ whitespace_in_element_content = True
+ cdata_sections = True
+ comments = True
+ charset_overrides_xml_encoding = True
+ infoset = False
+ supported_mediatypes_only = False
+
+ errorHandler = None
+ filter = None
+
+
+class DOMBuilder:
+ entityResolver = None
+ errorHandler = None
+ filter = None
+
+ ACTION_REPLACE = 1
+ ACTION_APPEND_AS_CHILDREN = 2
+ ACTION_INSERT_AFTER = 3
+ ACTION_INSERT_BEFORE = 4
+
+ _legal_actions = (ACTION_REPLACE, ACTION_APPEND_AS_CHILDREN,
+ ACTION_INSERT_AFTER, ACTION_INSERT_BEFORE)
+
+ def __init__(self):
+ self._options = Options()
+
+ def _get_entityResolver(self):
+ return self.entityResolver
+ def _set_entityResolver(self, entityResolver):
+ self.entityResolver = entityResolver
+
+ def _get_errorHandler(self):
+ return self.errorHandler
+ def _set_errorHandler(self, errorHandler):
+ self.errorHandler = errorHandler
+
+ def _get_filter(self):
+ return self.filter
+ def _set_filter(self, filter):
+ self.filter = filter
+
+ def setFeature(self, name, state):
+ if self.supportsFeature(name):
+ state = state and 1 or 0
+ try:
+ settings = self._settings[(_name_xform(name), state)]
+ except KeyError:
+ raise xml.dom.NotSupportedErr(
+ "unsupported feature: " + `name`)
+ else:
+ for name, value in settings:
+ setattr(self._options, name, value)
+ else:
+ raise xml.dom.NotFoundErr("unknown feature: " + repr(name))
+
+ def supportsFeature(self, name):
+ return hasattr(self._options, _name_xform(name))
+
+ def canSetFeature(self, name, state):
+ key = (_name_xform(name), state and 1 or 0)
+ return self._settings.has_key(key)
+
+ # This dictionary maps from (feature,value) to a list of
+ # (option,value) pairs that should be set on the Options object.
+ # If a (feature,value) setting is not in this dictionary, it is
+ # not supported by the DOMBuilder.
+ #
+ _settings = {
+ ("namespace_declarations", 0): [
+ ("namespace_declarations", 0)],
+ ("namespace_declarations", 1): [
+ ("namespace_declarations", 1)],
+ ("validation", 0): [
+ ("validation", 0)],
+ ("external_general_entities", 0): [
+ ("external_general_entities", 0)],
+ ("external_general_entities", 1): [
+ ("external_general_entities", 1)],
+ ("external_parameter_entities", 0): [
+ ("external_parameter_entities", 0)],
+ ("external_parameter_entities", 1): [
+ ("external_parameter_entities", 1)],
+ ("validate_if_schema", 0): [
+ ("validate_if_schema", 0)],
+ ("create_entity_ref_nodes", 0): [
+ ("create_entity_ref_nodes", 0)],
+ ("create_entity_ref_nodes", 1): [
+ ("create_entity_ref_nodes", 1)],
+ ("entities", 0): [
+ ("create_entity_ref_nodes", 0),
+ ("entities", 0)],
+ ("entities", 1): [
+ ("entities", 1)],
+ ("whitespace_in_element_content", 0): [
+ ("whitespace_in_element_content", 0)],
+ ("whitespace_in_element_content", 1): [
+ ("whitespace_in_element_content", 1)],
+ ("cdata_sections", 0): [
+ ("cdata_sections", 0)],
+ ("cdata_sections", 1): [
+ ("cdata_sections", 1)],
+ ("comments", 0): [
+ ("comments", 0)],
+ ("comments", 1): [
+ ("comments", 1)],
+ ("charset_overrides_xml_encoding", 0): [
+ ("charset_overrides_xml_encoding", 0)],
+ ("charset_overrides_xml_encoding", 1): [
+ ("charset_overrides_xml_encoding", 1)],
+ ("infoset", 0): [],
+ ("infoset", 1): [
+ ("namespace_declarations", 0),
+ ("validate_if_schema", 0),
+ ("create_entity_ref_nodes", 0),
+ ("entities", 0),
+ ("cdata_sections", 0),
+ ("datatype_normalization", 1),
+ ("whitespace_in_element_content", 1),
+ ("comments", 1),
+ ("charset_overrides_xml_encoding", 1)],
+ ("supported_mediatypes_only", 0): [
+ ("supported_mediatypes_only", 0)],
+ ("namespaces", 0): [
+ ("namespaces", 0)],
+ ("namespaces", 1): [
+ ("namespaces", 1)],
+ }
+
+ def getFeature(self, name):
+ xname = _name_xform(name)
+ try:
+ return getattr(self._options, xname)
+ except AttributeError:
+ if name == "infoset":
+ options = self._options
+ return (options.datatype_normalization
+ and options.whitespace_in_element_content
+ and options.comments
+ and options.charset_overrides_xml_encoding
+ and not (options.namespace_declarations
+ or options.validate_if_schema
+ or options.create_entity_ref_nodes
+ or options.entities
+ or options.cdata_sections))
+ raise xml.dom.NotFoundErr("feature %s not known" % repr(name))
+
+ def parseURI(self, uri):
+ if self.entityResolver:
+ input = self.entityResolver.resolveEntity(None, uri)
+ else:
+ input = DOMEntityResolver().resolveEntity(None, uri)
+ return self.parse(input)
+
+ def parse(self, input):
+ options = copy.copy(self._options)
+ options.filter = self.filter
+ options.errorHandler = self.errorHandler
+ fp = input.byteStream
+ if fp is None and options.systemId:
+ import urllib2
+ fp = urllib2.urlopen(input.systemId)
+ return self._parse_bytestream(fp, options)
+
+ def parseWithContext(self, input, cnode, action):
+ if action not in self._legal_actions:
+ raise ValueError("not a legal action")
+ raise NotImplementedError("Haven't written this yet...")
+
+ def _parse_bytestream(self, stream, options):
+ import xml.dom.expatbuilder
+ builder = xml.dom.expatbuilder.makeBuilder(options)
+ return builder.parseFile(stream)
+
+
+def _name_xform(name):
+ return name.lower().replace('-', '_')
+
+
+class DOMEntityResolver(NewStyle):
+ __slots__ = '_opener',
+
+ def resolveEntity(self, publicId, systemId):
+ assert systemId is not None
+ source = DOMInputSource()
+ source.publicId = publicId
+ source.systemId = systemId
+ source.byteStream = self._get_opener().open(systemId)
+
+ # determine the encoding if the transport provided it
+ source.encoding = self._guess_media_encoding(source)
+
+ # determine the base URI is we can
+ import posixpath, urlparse
+ parts = urlparse.urlparse(systemId)
+ scheme, netloc, path, params, query, fragment = parts
+ # XXX should we check the scheme here as well?
+ if path and not path.endswith("/"):
+ path = posixpath.dirname(path) + "/"
+ parts = scheme, netloc, path, params, query, fragment
+ source.baseURI = urlparse.urlunparse(parts)
+
+ return source
+
+ def _get_opener(self):
+ try:
+ return self._opener
+ except AttributeError:
+ self._opener = self._create_opener()
+ return self._opener
+
+ def _create_opener(self):
+ import urllib2
+ return urllib2.build_opener()
+
+ def _guess_media_encoding(self, source):
+ info = source.byteStream.info()
+ if info.has_key("Content-Type"):
+ for param in info.getplist():
+ if param.startswith("charset="):
+ return param.split("=", 1)[1].lower()
+
+
+class DOMInputSource(NewStyle):
+ __slots__ = ('byteStream', 'characterStream', 'stringData',
+ 'encoding', 'publicId', 'systemId', 'baseURI')
+
+ def __init__(self):
+ self.byteStream = None
+ self.characterStream = None
+ self.stringData = None
+ self.encoding = None
+ self.publicId = None
+ self.systemId = None
+ self.baseURI = None
+
+ def _get_byteStream(self):
+ return self.byteStream
+ def _set_byteStream(self, byteStream):
+ self.byteStream = byteStream
+
+ def _get_characterStream(self):
+ return self.characterStream
+ def _set_characterStream(self, characterStream):
+ self.characterStream = characterStream
+
+ def _get_stringData(self):
+ return self.stringData
+ def _set_stringData(self, data):
+ self.stringData = data
+
+ def _get_encoding(self):
+ return self.encoding
+ def _set_encoding(self, encoding):
+ self.encoding = encoding
+
+ def _get_publicId(self):
+ return self.publicId
+ def _set_publicId(self, publicId):
+ self.publicId = publicId
+
+ def _get_systemId(self):
+ return self.systemId
+ def _set_systemId(self, systemId):
+ self.systemId = systemId
+
+ def _get_baseURI(self):
+ return self.baseURI
+ def _set_baseURI(self, uri):
+ self.baseURI = uri
+
+
+class DOMBuilderFilter:
+ """Element filter which can be used to tailor construction of
+ a DOM instance.
+ """
+
+ # There's really no need for this class; concrete implementations
+ # should just implement the endElement() and startElement()
+ # methods as appropriate. Using this makes it easy to only
+ # implement one of them.
+
+ FILTER_ACCEPT = 1
+ FILTER_REJECT = 2
+ FILTER_SKIP = 3
+ FILTER_INTERRUPT = 4
+
+ whatToShow = NodeFilter.SHOW_ALL
+
+ def _get_whatToShow(self):
+ return self.whatToShow
+
+ def acceptNode(self, element):
+ return self.FILTER_ACCEPT
+
+ def startContainer(self, element):
+ return self.FILTER_ACCEPT
+
+del NodeFilter
+
+
+class DocumentLS:
+ """Mixin to create documents that conform to the load/save spec."""
+
+ async = False
+
+ def _get_async(self):
+ return False
+ def _set_async(self, async):
+ if async:
+ raise xml.dom.NotSupportedErr(
+ "asynchronous document loading is not supported")
+
+ def abort(self):
+ # What does it mean to "clear" a document? Does the
+ # documentElement disappear?
+ raise NotImplementedError(
+ "haven't figured out what this means yet")
+
+ def load(self, uri):
+ raise NotImplementedError("haven't written this yet")
+
+ def loadXML(self, source):
+ raise NotImplementedError("haven't written this yet")
+
+ def saveXML(self, snode):
+ if snode is None:
+ snode = self
+ elif snode.ownerDocument is not self:
+ raise xml.dom.WrongDocumentErr()
+ return snode.toxml()
+
+
+class DOMImplementationLS:
+ MODE_SYNCHRONOUS = 1
+ MODE_ASYNCHRONOUS = 2
+
+ def createDOMBuilder(self, mode, schemaType):
+ if schemaType is not None:
+ raise xml.dom.NotSupportedErr(
+ "schemaType not yet supported")
+ if mode == self.MODE_SYNCHRONOUS:
+ return DOMBuilder()
+ if mode == self.MODE_ASYNCHRONOUS:
+ raise xml.dom.NotSupportedErr(
+ "asynchronous builders are not supported")
+ raise ValueError("unknown value for mode")
+
+ def createDOMWriter(self):
+ raise NotImplementedError(
+ "the writer interface hasn't been written yet!")
+
+ def createDOMInputSource(self):
+ return DOMInputSource()