61 lines
2.3 KiB
Python
61 lines
2.3 KiB
Python
from django.conf import settings
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from xml.dom.minidom import parse, parseString
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import libxml2
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''' This file will eventually form an abstraction layer between the
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course XML file and the rest of the system.
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TODO: Shift everything from xml.dom.minidom to XPath (or XQuery)
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'''
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def module_xml(module, id_tag, module_id):
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''' Get XML for a module based on module and module_id. Assumes
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module occurs once in course.xml. '''
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doc = libxml2.parseFile(settings.DATA_DIR+'course.xml')
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# Sanitize input
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if not module.isalnum():
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raise Exception("Module is not alphanumeric")
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if not module_id.isalnum():
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raise Exception("Module ID is not alphanumeric")
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xpath_search='//*/{module}[@{id_tag} = "{id}"]'.format(module=module,
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id_tag=id_tag,
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id=module_id)
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result_set=doc.xpathEval(xpath_search)
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if len(result_set)>1:
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print "WARNING: Potentially malformed course file", module, module_id
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if len(result_set)==0:
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return None
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return result_set[0].serialize()
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def toc_from_xml(active_chapter,active_section):
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dom=parse(settings.DATA_DIR+'course.xml')
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course = dom.getElementsByTagName('course')[0]
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name=course.getAttribute("name")
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chapters = course.getElementsByTagName('chapter')
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ch=list()
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for c in chapters:
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sections=list()
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for s in c.getElementsByTagName('section'):
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sections.append({'name':s.getAttribute("name"),
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'time':s.getAttribute("time"),
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'format':s.getAttribute("format"),
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'due':s.getAttribute("due"),
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'active':(c.getAttribute("name")==active_chapter and \
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s.getAttribute("name")==active_section)})
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ch.append({'name':c.getAttribute("name"),
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'sections':sections,
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'active':(c.getAttribute("name")==active_chapter)})
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return ch
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def dom_select(dom, element_type, element_name):
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if dom==None:
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return None
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elements=dom.getElementsByTagName(element_type)
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for e in elements:
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if e.getAttribute("name")==element_name:
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return e
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return None
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