standards/xmp/__init__.py

   1 from os.path import join
   2 from Globals import package_home
   3 from _namespaces import namespaces
   4
   5 home = package_home(globals())
   6
   7 f = file(join(home, 'accessors.csv'))
   8 lines = f.readlines()
   9 f.close()
  10
  11 accessors = {}
  12 accessorIds = {}
  13 rdfKwnowTypes = {'Seq':True, 'prop':True, 'Alt':True, 'Bag':True}
  14
  15 prefix2Ns = dict([item[::-1] for item in namespaces.items()])
  16
  17 for l in [l for l in lines if not l.startswith('#')] :
  18         fields = [f.strip() for f in l.split(',')]
  19
  20         if not filter(None, fields) : continue
  21
  22         cat, caption, name, root, rdfType = fields
  23
  24         accessor = { 'id' : name.split(':')[1]
  25                            , 'root' : root
  26                            , 'rdfType' : rdfType
  27                            , 'namespace' : prefix2Ns.get(name.split(':')[0])
  28                                 }
  29
  30         assert not accessors.has_key(name), "Duplicate definition for %r" % name
  31         assert name.count(':') <=1, "Ambiguous name %r" % name
  32         assert not accessorIds.has_key(accessor['id']), "Ambiguous name: %r" % name
  33         assert rdfKwnowTypes.has_key(rdfType), "Unknown rdf type: %r" % rdfType
  34         if rdfType == 'prop' :
  35                 assert prefix2Ns.has_key(name.split(':')[0]), \
  36                         "Attribute name %r don't match a known namespace prefix" % name
  37
  38         accessors[name] = accessor
  39         accessorIds[accessor['id']] = True
  40
  41
  42 __all__ = ('namespaces', 'prefix2Ns', 'accessors')