55 lines
2.0 KiB
Python
55 lines
2.0 KiB
Python
from lxml import etree
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from xmodule.editing_module import XMLEditingDescriptor
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from xmodule.xml_module import XmlDescriptor
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import logging
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import sys
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from xblock.core import String, Scope
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from exceptions import SerializationError
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log = logging.getLogger(__name__)
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class RawDescriptor(XmlDescriptor, XMLEditingDescriptor):
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"""
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Module that provides a raw editing view of its data and children. It
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requires that the definition xml is valid.
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"""
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data = String(help="XML data for the module", default="", scope=Scope.content)
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@classmethod
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def definition_from_xml(cls, xml_object, system):
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return {'data': etree.tostring(xml_object, pretty_print=True, encoding='unicode')}, []
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def definition_to_xml(self, resource_fs):
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try:
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return etree.fromstring(self.data)
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except etree.XMLSyntaxError as err:
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# Can't recover here, so just add some info and
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# re-raise
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lines = self.data.split('\n')
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line, offset = err.position
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msg = ("Unable to create xml for module {loc}. "
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"Context: '{context}'".format(
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context=lines[line - 1][offset - 40:offset + 40],
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loc=self.location))
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raise SerializationError(self.location, msg)
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class EmptyDataRawDescriptor(XmlDescriptor, XMLEditingDescriptor):
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"""
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Version of RawDescriptor for modules which may have no XML data,
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but use XMLEditingDescriptor for import/export handling.
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"""
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data = String(default='', scope=Scope.content)
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@classmethod
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def definition_from_xml(cls, xml_object, system):
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if len(xml_object) == 0 and len(xml_object.items()) == 0:
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return {'data': ''}, []
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return {'data': etree.tostring(xml_object, pretty_print=True, encoding='unicode')}, []
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def definition_to_xml(self, resource_fs):
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if self.data:
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return etree.fromstring(self.data)
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return etree.Element(self.category)
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