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