795 lines
35 KiB
Python
795 lines
35 KiB
Python
#
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# Copyright (c), 2016-2019, SISSA (International School for Advanced Studies).
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# All rights reserved.
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# This file is distributed under the terms of the MIT License.
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# See the file 'LICENSE' in the root directory of the present
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# distribution, or http://opensource.org/licenses/MIT.
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#
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# @author Davide Brunato <brunato@sissa.it>
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#
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"""
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This module contains converter classes and definitions.
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"""
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from __future__ import unicode_literals
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from collections import namedtuple, OrderedDict
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import string
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from .compat import ordered_dict_class, unicode_type
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from .exceptions import XMLSchemaValueError
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from .etree import etree_element, lxml_etree_element, etree_register_namespace, lxml_etree_register_namespace
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from .namespaces import XSI_NAMESPACE
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from xmlschema.namespaces import NamespaceMapper
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ElementData = namedtuple('ElementData', ['tag', 'text', 'content', 'attributes'])
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"Namedtuple for Element data interchange between decoders and converters."
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def raw_xml_encode(value):
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if isinstance(value, bool):
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return 'true' if value else 'false'
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elif isinstance(value, (list, tuple)):
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return ' '.join(unicode_type(e) for e in value)
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else:
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return unicode_type(value)
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class XMLSchemaConverter(NamespaceMapper):
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"""
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Generic XML Schema based converter class. A converter is used to compose
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decoded XML data for an Element into a data structure and to build an Element
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from encoded data structure.
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:param namespaces: map from namespace prefixes to URI.
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:param dict_class: dictionary class to use for decoded data. Default is `dict`.
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:param list_class: list class to use for decoded data. Default is `list`.
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:param text_key: is the key to apply to element's decoded text data.
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:param attr_prefix: controls the mapping of XML attributes, to the same name or \
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with a prefix. If `None` the converter ignores attributes.
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:param cdata_prefix: is used for including and prefixing the CDATA parts of a \
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mixed content, that are labeled with an integer instead of a string. \
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CDATA parts are ignored if this argument is `None`.
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:param etree_element_class: the class that has to be used to create new XML elements, \
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if not provided uses the ElementTree's Element class.
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:param indent: number of spaces for XML indentation (default is 4).
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:ivar dict: dictionary class to use for decoded data.
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:ivar list: list class to use for decoded data.
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:ivar text_key: key for decoded Element text
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:ivar attr_prefix: prefix for attribute names
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:ivar cdata_prefix: prefix for character data parts
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:ivar etree_element_class: Element class to use
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:ivar indent: indentation to use for rebuilding XML trees
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"""
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def __init__(self, namespaces=None, dict_class=None, list_class=None, text_key='$', attr_prefix='@',
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cdata_prefix=None, etree_element_class=None, indent=4, **kwargs):
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if etree_element_class is not None and etree_element_class not in (etree_element, lxml_etree_element):
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raise XMLSchemaValueError("%r: unsupported element.")
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self.dict = dict_class or dict
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self.list = list_class or list
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self.text_key = text_key
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self.attr_prefix = attr_prefix
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self.cdata_prefix = cdata_prefix
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self.etree_element_class = etree_element_class or etree_element
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self.indent = indent
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if etree_element_class is etree_element:
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super(XMLSchemaConverter, self).__init__(namespaces, etree_register_namespace)
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else:
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super(XMLSchemaConverter, self).__init__(namespaces, lxml_etree_register_namespace)
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def __setattr__(self, name, value):
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if name in ('attr_prefix', 'text_key', 'cdata_prefix'):
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if value is not None and any(c in string.ascii_letters or c == '_' for c in value):
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raise XMLSchemaValueError('%r cannot includes letters or underscores: %r' % (name, value))
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elif name == 'attr_prefix':
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self.ns_prefix = (value or '') + 'xmlns'
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super(XMLSchemaConverter, self).__setattr__(name, value)
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@property
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def lossless(self):
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"""The converter can ignore some kind of XML data during decoding."""
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return self.cdata_prefix and self.text_key and self.attr_prefix
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@property
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def losslessly(self):
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"""
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The format of decoded data is without loss of quality. Only losslessly formats can be
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always used to encode to an XML data that is strictly conformant to the schema.
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"""
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return False
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def copy(self, **kwargs):
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return type(self)(
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namespaces=kwargs.get('namespaces', self._namespaces),
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dict_class=kwargs.get('dict_class', self.dict),
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list_class=kwargs.get('list_class', self.list),
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text_key=kwargs.get('text_key', self.text_key),
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attr_prefix=kwargs.get('attr_prefix', self.attr_prefix),
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cdata_prefix=kwargs.get('cdata_prefix', self.cdata_prefix),
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etree_element_class=kwargs.get('etree_element_class'),
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indent=kwargs.get('indent', self.indent),
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)
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def map_attributes(self, attributes):
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"""
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Creates an iterator for converting decoded attributes to a data structure with
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appropriate prefixes. If the instance has a not-empty map of namespaces registers
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the mapped URIs and prefixes.
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:param attributes: A sequence or an iterator of couples with the name of \
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the attribute and the decoded value. Default is `None` (for `simpleType` \
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elements, that don't have attributes).
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"""
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if self.attr_prefix is None or not attributes:
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return
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elif self.attr_prefix:
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for name, value in attributes:
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yield '%s%s' % (self.attr_prefix, self.map_qname(name)), value
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else:
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for name, value in attributes:
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yield self.map_qname(name), value
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def _unmap_attribute_qname(self, name):
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if name[0] == '{' or ':' not in name:
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return name
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else:
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return self.unmap_qname(name)
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def map_content(self, content):
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"""
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A generator function for converting decoded content to a data structure.
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If the instance has a not-empty map of namespaces registers the mapped URIs
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and prefixes.
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:param content: A sequence or an iterator of tuples with the name of the \
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element, the decoded value and the `XsdElement` instance associated.
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"""
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if not content:
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return
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map_qname = self.map_qname
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for name, value, xsd_child in content:
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try:
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if name[0] == '{':
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yield map_qname(name), value, xsd_child
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else:
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yield name, value, xsd_child
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except TypeError:
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if self.cdata_prefix is not None:
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yield '%s%s' % (self.cdata_prefix, name), value, xsd_child
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def etree_element(self, tag, text=None, children=None, attrib=None, level=0):
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"""
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Builds an ElementTree's Element using arguments and the element class and
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the indent spacing stored in the converter instance.
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:param tag: the Element tag string.
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:param text: the Element text.
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:param children: the list of Element children/subelements.
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:param attrib: a dictionary with Element attributes.
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:param level: the level related to the encoding process (0 means the root).
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:return: an instance of the Element class setted for the converter instance.
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"""
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if type(self.etree_element_class) is type(etree_element):
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if attrib is None:
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elem = self.etree_element_class(tag)
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else:
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elem = self.etree_element_class(tag, self.dict(attrib))
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else:
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nsmap = {prefix if prefix else None: uri for prefix, uri in self._namespaces.items()}
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elem = self.etree_element_class(tag, OrderedDict(attrib), nsmap)
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if children:
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elem.extend(children)
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elem.text = text or '\n' + ' ' * self.indent * (level + 1)
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elem.tail = '\n' + ' ' * self.indent * level
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else:
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elem.text = text
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elem.tail = '\n' + ' ' * self.indent * level
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return elem
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def element_decode(self, data, xsd_element, level=0):
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"""
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Converts a decoded element data to a data structure.
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:param data: ElementData instance decoded from an Element node.
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:param xsd_element: the `XsdElement` associated to decoded the data.
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:param level: the level related to the decoding process (0 means the root).
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:return: a data structure containing the decoded data.
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"""
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result_dict = self.dict()
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if level == 0 and xsd_element.is_global and self:
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schema_namespaces = set(xsd_element.namespaces.values())
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result_dict.update(
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('%s:%s' % (self.ns_prefix, k) if k else self.ns_prefix, v) for k, v in self.items()
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if v in schema_namespaces or v == XSI_NAMESPACE
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)
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if xsd_element.type.is_simple() or xsd_element.type.has_simple_content():
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if data.attributes:
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result_dict.update(t for t in self.map_attributes(data.attributes))
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if data.text is not None and data.text != '':
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result_dict[self.text_key] = data.text
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return result_dict
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else:
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return data.text if data.text != '' else None
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else:
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if data.attributes:
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result_dict.update(t for t in self.map_attributes(data.attributes))
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has_single_group = xsd_element.type.content_type.is_single()
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list_types = list if self.list is list else (self.list, list)
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for name, value, xsd_child in self.map_content(data.content):
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try:
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result = result_dict[name]
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except KeyError:
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if xsd_child is None or has_single_group and xsd_child.is_single():
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result_dict[name] = value
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else:
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result_dict[name] = self.list([value])
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else:
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if not isinstance(result, list_types) or not result:
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result_dict[name] = self.list([result, value])
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elif isinstance(result[0], list_types) or not isinstance(value, list_types):
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result.append(value)
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else:
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result_dict[name] = self.list([result, value])
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return result_dict if result_dict else None
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def element_encode(self, obj, xsd_element, level=0):
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"""
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Extracts XML decoded data from a data structure for encoding into an ElementTree.
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:param obj: the decoded object.
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:param xsd_element: the `XsdElement` associated to the decoded data structure.
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:param level: the level related to the encoding process (0 means the root).
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:return: an ElementData instance.
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"""
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tag = xsd_element.qualified_name if level == 0 else xsd_element.name
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if not isinstance(obj, (self.dict, dict)):
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if xsd_element.type.is_simple() or xsd_element.type.has_simple_content():
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return ElementData(tag, obj, None, self.dict())
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else:
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return ElementData(tag, None, obj, self.dict())
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unmap_qname = self.unmap_qname
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unmap_attribute_qname = self._unmap_attribute_qname
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text_key = self.text_key
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attr_prefix = self.attr_prefix
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ns_prefix = self.ns_prefix
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cdata_prefix = self.cdata_prefix
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text = None
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content = []
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attributes = self.dict()
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for name, value in obj.items():
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if text_key and name == text_key:
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text = obj[text_key]
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elif (cdata_prefix and name.startswith(cdata_prefix)) or \
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name[0].isdigit() and cdata_prefix == '':
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index = int(name[len(cdata_prefix):])
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content.append((index, value))
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elif name == ns_prefix:
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self[''] = value
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elif name.startswith('%s:' % ns_prefix):
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self[name[len(ns_prefix) + 1:]] = value
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elif attr_prefix and name.startswith(attr_prefix):
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name = name[len(attr_prefix):]
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attributes[unmap_attribute_qname(name)] = value
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elif not isinstance(value, (self.list, list)) or not value:
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content.append((unmap_qname(name), value))
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elif isinstance(value[0], (self.dict, dict, self.list, list)):
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ns_name = unmap_qname(name)
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for item in value:
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content.append((ns_name, item))
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else:
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ns_name = unmap_qname(name)
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for xsd_child in xsd_element.type.content_type.iter_elements():
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matched_element = xsd_child.match(ns_name, self.get(''))
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if matched_element is not None:
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if matched_element.type.is_list():
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content.append((ns_name, value))
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else:
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for item in value:
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content.append((ns_name, item))
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break
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else:
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if attr_prefix == '' and ns_name not in attributes:
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for xsd_attribute in xsd_element.attributes.values():
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if xsd_attribute.is_matching(ns_name):
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attributes[ns_name] = value
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break
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else:
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content.append((ns_name, value))
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else:
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content.append((ns_name, value))
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return ElementData(tag, text, content, attributes)
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class ParkerConverter(XMLSchemaConverter):
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"""
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XML Schema based converter class for Parker convention.
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ref: http://wiki.open311.org/JSON_and_XML_Conversion/#the-parker-convention
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ref: https://developer.mozilla.org/en-US/docs/Archive/JXON#The_Parker_Convention
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:param namespaces: Map from namespace prefixes to URI.
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:param dict_class: Dictionary class to use for decoded data. Default is `dict` for \
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Python 3.6+ or `OrderedDict` for previous versions.
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:param list_class: List class to use for decoded data. Default is `list`.
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:param preserve_root: If `True` the root element will be preserved. For default \
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the Parker convention remove the document root element, returning only the value.
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"""
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def __init__(self, namespaces=None, dict_class=None, list_class=None, preserve_root=False, **kwargs):
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kwargs.update(attr_prefix=None, text_key='', cdata_prefix=None)
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super(ParkerConverter, self).__init__(
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namespaces, dict_class or ordered_dict_class, list_class, **kwargs
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)
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self.preserve_root = preserve_root
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def __setattr__(self, name, value):
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if name == 'text_key' and value != '' or name in ('attr_prefix', 'cdata_prefix') and value is not None:
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raise XMLSchemaValueError('Wrong value %r for the attribute %r of a %r.' % (value, name, type(self)))
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super(XMLSchemaConverter, self).__setattr__(name, value)
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@property
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def lossless(self):
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return False
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def copy(self, **kwargs):
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return type(self)(
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namespaces=kwargs.get('namespaces', self._namespaces),
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dict_class=kwargs.get('dict_class', self.dict),
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list_class=kwargs.get('list_class', self.list),
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preserve_root=kwargs.get('preserve_root', self.preserve_root),
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etree_element_class=kwargs.get('etree_element_class'),
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indent=kwargs.get('indent', self.indent),
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)
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def element_decode(self, data, xsd_element, level=0):
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map_qname = self.map_qname
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preserve_root = self.preserve_root
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if xsd_element.type.is_simple() or xsd_element.type.has_simple_content():
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if preserve_root:
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return self.dict([(map_qname(data.tag), data.text)])
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else:
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return data.text if data.text != '' else None
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else:
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result_dict = self.dict()
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list_types = list if self.list is list else (self.list, list)
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for name, value, xsd_child in self.map_content(data.content):
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if preserve_root:
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try:
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if len(value) == 1:
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value = value[name]
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except (TypeError, KeyError):
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pass
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try:
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result_dict[name].append(value)
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except KeyError:
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if isinstance(value, list_types):
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result_dict[name] = self.list([value])
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else:
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result_dict[name] = value
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except AttributeError:
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result_dict[name] = self.list([result_dict[name], value])
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for k, v in result_dict.items():
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if isinstance(v, (self.list, list)) and len(v) == 1:
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value = v.pop()
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v.extend(value)
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if preserve_root:
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return self.dict([(map_qname(data.tag), result_dict)])
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else:
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return result_dict if result_dict else None
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def element_encode(self, obj, xsd_element, level=0):
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if not isinstance(obj, (self.dict, dict)):
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if obj == '':
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obj = None
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if xsd_element.type.is_simple() or xsd_element.type.has_simple_content():
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return ElementData(xsd_element.name, obj, None, self.dict())
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else:
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return ElementData(xsd_element.name, None, obj, self.dict())
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else:
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unmap_qname = self.unmap_qname
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if not obj:
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return ElementData(xsd_element.name, None, None, self.dict())
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elif self.preserve_root:
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try:
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items = obj[self.map_qname(xsd_element.name)]
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except KeyError:
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return ElementData(xsd_element.name, None, None, self.dict())
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else:
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items = obj
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try:
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content = []
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for name, value in obj.items():
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ns_name = unmap_qname(name)
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if not isinstance(value, (self.list, list)) or not value:
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content.append((ns_name, value))
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elif any(isinstance(v, (self.list, list)) for v in value):
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for item in value:
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content.append((ns_name, item))
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else:
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for xsd_child in xsd_element.type.content_type.iter_elements():
|
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matched_element = xsd_child.match(ns_name, self.get(''))
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if matched_element is not None:
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if matched_element.type.is_list():
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content.append((ns_name, value))
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else:
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for item in value:
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content.append((ns_name, item))
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break
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else:
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for item in value:
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content.append((ns_name, item))
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except AttributeError:
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return ElementData(xsd_element.name, items, None, self.dict())
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else:
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return ElementData(xsd_element.name, None, content, self.dict())
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|
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class BadgerFishConverter(XMLSchemaConverter):
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"""
|
|
XML Schema based converter class for Badgerfish convention.
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|
|
ref: http://www.sklar.com/badgerfish/
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ref: http://badgerfish.ning.com/
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|
|
:param namespaces: Map from namespace prefixes to URI.
|
|
:param dict_class: Dictionary class to use for decoded data. Default is `dict` for \
|
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Python 3.6+ or `OrderedDict` for previous versions.
|
|
:param list_class: List class to use for decoded data. Default is `list`.
|
|
"""
|
|
def __init__(self, namespaces=None, dict_class=None, list_class=None, **kwargs):
|
|
kwargs.update(attr_prefix='@', text_key='$', cdata_prefix='#')
|
|
super(BadgerFishConverter, self).__init__(
|
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namespaces, dict_class or ordered_dict_class, list_class, **kwargs
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)
|
|
|
|
def __setattr__(self, name, value):
|
|
if name == 'text_key' and value != '$' or name == 'attr_prefix' and value != '@' or \
|
|
name == 'cdata_prefix' and value != '#':
|
|
raise XMLSchemaValueError('Wrong value %r for the attribute %r of a %r.' % (value, name, type(self)))
|
|
super(XMLSchemaConverter, self).__setattr__(name, value)
|
|
|
|
@property
|
|
def lossless(self):
|
|
return True
|
|
|
|
def element_decode(self, data, xsd_element, level=0):
|
|
dict_class = self.dict
|
|
|
|
tag = self.map_qname(data.tag)
|
|
has_local_root = not len(self)
|
|
result_dict = dict_class([t for t in self.map_attributes(data.attributes)])
|
|
if has_local_root:
|
|
result_dict['@xmlns'] = dict_class()
|
|
|
|
if xsd_element.type.is_simple() or xsd_element.type.has_simple_content():
|
|
if data.text is not None and data.text != '':
|
|
result_dict[self.text_key] = data.text
|
|
else:
|
|
has_single_group = xsd_element.type.content_type.is_single()
|
|
list_types = list if self.list is list else (self.list, list)
|
|
for name, value, xsd_child in self.map_content(data.content):
|
|
try:
|
|
if '@xmlns' in value:
|
|
self.transfer(value['@xmlns'])
|
|
if not value['@xmlns']:
|
|
del value['@xmlns']
|
|
elif '@xmlns' in value[name]:
|
|
self.transfer(value[name]['@xmlns'])
|
|
if not value[name]['@xmlns']:
|
|
del value[name]['@xmlns']
|
|
if len(value) == 1:
|
|
value = value[name]
|
|
except (TypeError, KeyError):
|
|
pass
|
|
|
|
if value is None:
|
|
value = self.dict()
|
|
|
|
try:
|
|
result = result_dict[name]
|
|
except KeyError:
|
|
if xsd_child is None or has_single_group and xsd_child.is_single():
|
|
result_dict[name] = value
|
|
else:
|
|
result_dict[name] = self.list([value])
|
|
else:
|
|
if not isinstance(result, list_types) or not result:
|
|
result_dict[name] = self.list([result, value])
|
|
elif isinstance(result[0], list_types) or not isinstance(value, list_types):
|
|
result.append(value)
|
|
else:
|
|
result_dict[name] = self.list([result, value])
|
|
|
|
if has_local_root:
|
|
if self:
|
|
result_dict['@xmlns'].update(self)
|
|
else:
|
|
del result_dict['@xmlns']
|
|
return dict_class([(tag, result_dict)])
|
|
else:
|
|
return dict_class([('@xmlns', dict_class(self)), (tag, result_dict)])
|
|
|
|
def element_encode(self, obj, xsd_element, level=0):
|
|
map_qname = self.map_qname
|
|
unmap_qname = self.unmap_qname
|
|
unmap_attribute_qname = self._unmap_attribute_qname
|
|
tag = xsd_element.qualified_name if level == 0 else xsd_element.name
|
|
|
|
try:
|
|
self.update(obj['@xmlns'])
|
|
except KeyError:
|
|
pass
|
|
|
|
try:
|
|
element_data = obj[map_qname(xsd_element.name)]
|
|
except KeyError:
|
|
element_data = obj
|
|
|
|
text_key = self.text_key
|
|
attr_prefix = self.attr_prefix
|
|
cdata_prefix = self.cdata_prefix
|
|
text = None
|
|
content = []
|
|
attributes = self.dict()
|
|
for name, value in element_data.items():
|
|
if name == '@xmlns':
|
|
continue
|
|
elif text_key and name == text_key:
|
|
text = element_data[text_key]
|
|
elif (cdata_prefix and name.startswith(cdata_prefix)) or \
|
|
name[0].isdigit() and cdata_prefix == '':
|
|
index = int(name[len(cdata_prefix):])
|
|
content.append((index, value))
|
|
elif attr_prefix and name.startswith(attr_prefix):
|
|
name = name[len(attr_prefix):]
|
|
attributes[unmap_attribute_qname(name)] = value
|
|
elif not isinstance(value, (self.list, list)) or not value:
|
|
content.append((unmap_qname(name), value))
|
|
elif isinstance(value[0], (self.dict, dict, self.list, list)):
|
|
ns_name = unmap_qname(name)
|
|
for item in value:
|
|
content.append((ns_name, item))
|
|
else:
|
|
ns_name = unmap_qname(name)
|
|
for xsd_child in xsd_element.type.content_type.iter_elements():
|
|
matched_element = xsd_child.match(ns_name, self.get(''))
|
|
if matched_element is not None:
|
|
if matched_element.type.is_list():
|
|
content.append((ns_name, value))
|
|
else:
|
|
for item in value:
|
|
content.append((ns_name, item))
|
|
break
|
|
else:
|
|
if attr_prefix == '' and ns_name not in attributes:
|
|
for xsd_attribute in xsd_element.attributes.values():
|
|
if xsd_attribute.is_matching(ns_name):
|
|
attributes[ns_name] = value
|
|
break
|
|
else:
|
|
content.append((ns_name, value))
|
|
else:
|
|
content.append((ns_name, value))
|
|
|
|
return ElementData(tag, text, content, attributes)
|
|
|
|
|
|
class AbderaConverter(XMLSchemaConverter):
|
|
"""
|
|
XML Schema based converter class for Abdera convention.
|
|
|
|
ref: http://wiki.open311.org/JSON_and_XML_Conversion/#the-abdera-convention
|
|
ref: https://cwiki.apache.org/confluence/display/ABDERA/JSON+Serialization
|
|
|
|
:param namespaces: Map from namespace prefixes to URI.
|
|
:param dict_class: Dictionary class to use for decoded data. Default is `dict` for \
|
|
Python 3.6+ or `OrderedDict` for previous versions.
|
|
:param list_class: List class to use for decoded data. Default is `list`.
|
|
"""
|
|
def __init__(self, namespaces=None, dict_class=None, list_class=None, **kwargs):
|
|
kwargs.update(attr_prefix='', text_key='', cdata_prefix=None)
|
|
super(AbderaConverter, self).__init__(
|
|
namespaces, dict_class or ordered_dict_class, list_class, **kwargs
|
|
)
|
|
|
|
def __setattr__(self, name, value):
|
|
if name in ('text_key', 'attr_prefix') and value != '' or name == 'cdata_prefix' and value is not None:
|
|
raise XMLSchemaValueError('Wrong value %r for the attribute %r of a %r.' % (value, name, type(self)))
|
|
super(XMLSchemaConverter, self).__setattr__(name, value)
|
|
|
|
@property
|
|
def lossless(self):
|
|
return False
|
|
|
|
def element_decode(self, data, xsd_element, level=0):
|
|
if xsd_element.type.is_simple() or xsd_element.type.has_simple_content():
|
|
children = data.text if data.text is not None and data.text != '' else None
|
|
else:
|
|
children = self.dict()
|
|
for name, value, xsd_child in self.map_content(data.content):
|
|
if value is None:
|
|
value = self.list()
|
|
|
|
try:
|
|
children[name].append(value)
|
|
except KeyError:
|
|
if isinstance(value, (self.list, list)) and value:
|
|
children[name] = self.list([value])
|
|
else:
|
|
children[name] = value
|
|
except AttributeError:
|
|
children[name] = self.list([children[name], value])
|
|
if not children:
|
|
children = None
|
|
|
|
if data.attributes:
|
|
if children != []:
|
|
return self.dict([
|
|
('attributes', self.dict([(k, v) for k, v in self.map_attributes(data.attributes)])),
|
|
('children', self.list([children]) if children is not None else self.list())
|
|
])
|
|
else:
|
|
return self.dict([
|
|
('attributes', self.dict([(k, v) for k, v in self.map_attributes(data.attributes)])),
|
|
])
|
|
else:
|
|
return children if children is not None else self.list()
|
|
|
|
def element_encode(self, obj, xsd_element, level=0):
|
|
tag = xsd_element.qualified_name if level == 0 else xsd_element.name
|
|
|
|
if not isinstance(obj, (self.dict, dict)):
|
|
if obj == []:
|
|
obj = None
|
|
return ElementData(tag, obj, None, self.dict())
|
|
else:
|
|
unmap_qname = self.unmap_qname
|
|
unmap_attribute_qname = self._unmap_attribute_qname
|
|
attributes = self.dict()
|
|
try:
|
|
attributes.update([(unmap_attribute_qname(k), v) for k, v in obj['attributes'].items()])
|
|
except KeyError:
|
|
children = obj
|
|
else:
|
|
children = obj.get('children', [])
|
|
|
|
if isinstance(children, (self.dict, dict)):
|
|
children = [children]
|
|
elif children and not isinstance(children[0], (self.dict, dict)):
|
|
if len(children) > 1:
|
|
raise XMLSchemaValueError("Wrong format")
|
|
else:
|
|
return ElementData(tag, children[0], None, attributes)
|
|
|
|
content = []
|
|
for child in children:
|
|
for name, value in child.items():
|
|
if not isinstance(value, (self.list, list)) or not value:
|
|
content.append((unmap_qname(name), value))
|
|
elif isinstance(value[0], (self.dict, dict, self.list, list)):
|
|
ns_name = unmap_qname(name)
|
|
for item in value:
|
|
content.append((ns_name, item))
|
|
else:
|
|
ns_name = unmap_qname(name)
|
|
for xsd_child in xsd_element.type.content_type.iter_elements():
|
|
matched_element = xsd_child.match(ns_name, self.get(''))
|
|
if matched_element is not None:
|
|
if matched_element.type.is_list():
|
|
content.append((ns_name, value))
|
|
else:
|
|
for item in value:
|
|
content.append((ns_name, item))
|
|
break
|
|
else:
|
|
content.append((ns_name, value))
|
|
|
|
return ElementData(tag, None, content, attributes)
|
|
|
|
|
|
class JsonMLConverter(XMLSchemaConverter):
|
|
"""
|
|
XML Schema based converter class for JsonML (JSON Mark-up Language) convention.
|
|
|
|
ref: http://www.jsonml.org/
|
|
ref: https://www.ibm.com/developerworks/library/x-jsonml/
|
|
|
|
:param namespaces: Map from namespace prefixes to URI.
|
|
:param dict_class: Dictionary class to use for decoded data. Default is `dict` for \
|
|
Python 3.6+ or `OrderedDict` for previous versions.
|
|
:param list_class: List class to use for decoded data. Default is `list`.
|
|
"""
|
|
def __init__(self, namespaces=None, dict_class=None, list_class=None, **kwargs):
|
|
kwargs.update(attr_prefix='', text_key='', cdata_prefix='')
|
|
super(JsonMLConverter, self).__init__(
|
|
namespaces, dict_class or ordered_dict_class, list_class, **kwargs
|
|
)
|
|
|
|
def __setattr__(self, name, value):
|
|
if name in ('text_key', 'attr_prefix', 'cdata_prefix') and value != '':
|
|
raise XMLSchemaValueError('Wrong value %r for the attribute %r of a %r.' % (value, name, type(self)))
|
|
super(XMLSchemaConverter, self).__setattr__(name, value)
|
|
|
|
@property
|
|
def lossless(self):
|
|
return True
|
|
|
|
@property
|
|
def losslessly(self):
|
|
return True
|
|
|
|
def element_decode(self, data, xsd_element, level=0):
|
|
result_list = self.list([self.map_qname(data.tag)])
|
|
attributes = self.dict([(k, v) for k, v in self.map_attributes(data.attributes)])
|
|
|
|
if xsd_element.type.is_simple() or xsd_element.type.has_simple_content():
|
|
if data.text is not None and data.text != '':
|
|
result_list.append(data.text)
|
|
else:
|
|
result_list.extend([
|
|
value if value is not None else self.list([name])
|
|
for name, value, _ in self.map_content(data.content)
|
|
])
|
|
|
|
if level == 0 and xsd_element.is_global and self:
|
|
attributes.update([('xmlns:%s' % k if k else 'xmlns', v) for k, v in self.items()])
|
|
if attributes:
|
|
result_list.insert(1, attributes)
|
|
return result_list
|
|
|
|
def element_encode(self, obj, xsd_element, level=0):
|
|
unmap_qname = self.unmap_qname
|
|
attributes = self.dict()
|
|
if not isinstance(obj, (self.list, list)) or not obj:
|
|
raise XMLSchemaValueError("Wrong data format, a not empty list required: %r." % obj)
|
|
|
|
data_len = len(obj)
|
|
if data_len == 1:
|
|
if not xsd_element.is_matching(unmap_qname(obj[0]), self.get('')):
|
|
raise XMLSchemaValueError("Unmatched tag")
|
|
return ElementData(xsd_element.name, None, None, attributes)
|
|
|
|
unmap_attribute_qname = self._unmap_attribute_qname
|
|
try:
|
|
for k, v in obj[1].items():
|
|
if k == 'xmlns':
|
|
self[''] = v
|
|
elif k.startswith('xmlns:'):
|
|
self[k.split('xmlns:')[1]] = v
|
|
else:
|
|
attributes[unmap_attribute_qname(k)] = v
|
|
except AttributeError:
|
|
content_index = 1
|
|
else:
|
|
content_index = 2
|
|
|
|
if not xsd_element.is_matching(unmap_qname(obj[0]), self.get('')):
|
|
raise XMLSchemaValueError("Unmatched tag")
|
|
|
|
if data_len <= content_index:
|
|
return ElementData(xsd_element.name, None, [], attributes)
|
|
elif data_len == content_index + 1 and \
|
|
(xsd_element.type.is_simple() or xsd_element.type.has_simple_content()):
|
|
return ElementData(xsd_element.name, obj[content_index], [], attributes)
|
|
else:
|
|
cdata_num = iter(range(1, data_len))
|
|
list_types = list if self.list is list else (self.list, list)
|
|
content = [
|
|
(unmap_qname(e[0]), e) if isinstance(e, list_types) else (next(cdata_num), e)
|
|
for e in obj[content_index:]
|
|
]
|
|
return ElementData(xsd_element.name, None, content, attributes)
|