75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
from xmodule.x_module import XModule
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from xmodule.raw_module import RawDescriptor
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from lxml import etree
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from mako.template import Template
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from xmodule.modulestore.django import modulestore
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class CustomTagModule(XModule):
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"""
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This module supports tags of the form
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<customtag option="val" option2="val2" impl="tagname"/>
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In this case, $tagname should refer to a file in data/custom_tags, which contains
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a mako template that uses ${option} and ${option2} for the content.
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For instance:
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data/mycourse/custom_tags/book::
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More information given in <a href="/book/${page}">the text</a>
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course.xml::
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...
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<customtag page="234" impl="book"/>
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...
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Renders to::
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More information given in <a href="/book/234">the text</a>
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"""
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def get_html(self):
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return self.descriptor.rendered_html
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class CustomTagDescriptor(RawDescriptor):
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""" Descriptor for custom tags. Loads the template when created."""
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module_class = CustomTagModule
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template_dir_name = 'customtag'
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def render_template(self, system, xml_data):
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'''Render the template, given the definition xml_data'''
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xmltree = etree.fromstring(xml_data)
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if 'impl' in xmltree.attrib:
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template_name = xmltree.attrib['impl']
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else:
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# VS[compat] backwards compatibility with old nested customtag structure
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child_impl = xmltree.find('impl')
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if child_impl is not None:
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template_name = child_impl.text
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else:
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# TODO (vshnayder): better exception type
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raise Exception("Could not find impl attribute in customtag {0}"
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.format(self.location))
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params = dict(xmltree.items())
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# cdodge: look up the template as a module
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template_loc = self.location.replace(category='custom_tag_template', name=template_name)
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template_module = modulestore().get_instance(system.course_id, template_loc)
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template_module_data = template_module.data
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template = Template(template_module_data)
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return template.render(**params)
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@property
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def rendered_html(self):
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return self.render_template(self.system, self.data)
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def export_to_file(self):
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"""
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Custom tags are special: since they're already pointers, we don't want
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to export them in a file with yet another layer of indirection.
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"""
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return False
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