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Use attribute objects for Pythonic access to all allowed (and only allowed) OPF 2.0 metadata attributes.

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This commit is contained in:
Marshall T. Vandegrift 2009-01-31 14:06:16 -05:00
parent daabc8bd5b
commit 047814a7a5
2 changed files with 45 additions and 19 deletions
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2
src/calibre/ebooks/mobi/writer.py
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@ -471,7 +471,7 @@ class MobiWriter(object):
if term == 'identifier':
if data.lower().startswith('urn:isbn:'):
data = data[9:]
elif item.get('scheme', '').lower() == 'isbn':
elif item.scheme.lower() == 'isbn':
pass
else:
continue

62
src/calibre/ebooks/oeb/base.py
View File

@ -220,12 +220,37 @@ class Metadata(object):
CALIBRE_TERMS = set(['series', 'series_index', 'rating'])
OPF_ATTRS = {'role': OPF('role'), 'file-as': OPF('file-as'),
'scheme': OPF('scheme'), 'event': OPF('event'),
'type': XSI('type'), 'id': 'id'}
'type': XSI('type'), 'lang': XML('lang'), 'id': 'id'}
OPF1_NSMAP = {'dc': DC11_NS, 'oebpackage': OPF1_NS}
OPF2_NSMAP = {'opf': OPF2_NS, 'dc': DC11_NS, 'dcterms': DCTERMS_NS,
'xsi': XSI_NS, 'calibre': CALIBRE_NS}
class Item(object):
class Attribute(object):
def __init__(self, attr, allowed=None):
if not callable(attr):
attr_, attr = attr, lambda term: attr_
self.attr = attr
self.allowed = allowed
def term_attr(self, obj):
term = obj.term
if namespace(term) != DC11_NS:
term = OPF('meta')
allowed = self.allowed
if allowed is not None and term not in allowed:
raise AttributeError(
'attribute %r not valid for metadata term %r' \
% (self.attr(term), barename(obj.term)))
return self.attr(term)
def __get__(self, obj, cls):
if obj is None: return None
return obj.attrib.get(self.term_attr(obj), '')
def __set__(self, obj, value):
obj.attrib[self.term_attr(obj)] = value
def __init__(self, term, value, attrib={}, nsmap={}, **kwargs):
self.attrib = attrib = dict(attrib)
self.nsmap = nsmap = dict(nsmap)
@ -246,26 +271,27 @@ class Metadata(object):
if isprefixname(value):
attrib[attr] = qname(value, nsmap)
nsattr = Metadata.OPF_ATTRS.get(attr, attr)
if nsattr == OPF('scheme') and namespace(term) != DC11_NS:
# The opf:meta element takes @scheme, not @opf:scheme
nsattr = 'scheme'
if attr != nsattr:
attrib[nsattr] = attrib.pop(attr)
self.__setattr__ = self._setattr
def __getattr__(self, name):
attr = name.replace('_', '-')
if attr in Metadata.OPF_ATTRS:
attr = Metadata.OPF_ATTRS[attr]
return self.attrib.get(attr, None)
raise AttributeError(
'%r object has no attribute %r' \
% (self.__class__.__name__, name))
def _setattr(self, name, value):
attr = name.replace('_', '-')
if attr in Metadata.OPF_ATTRS:
attr = Metadata.OPF_ATTRS[attr]
self.attrib[attr] = value
return
super(Item, self).__setattr__(self, name, value)
def scheme(term):
if term == OPF('meta'):
return 'scheme'
return OPF('scheme')
scheme = Attribute(scheme, [DC('identifier'), OPF('meta')])
file_as = Attribute(OPF('file-as'), [DC('creator'), DC('contributor')])
role = Attribute(OPF('role'), [DC('creator'), DC('contributor')])
event = Attribute(OPF('event'), [DC('date')])
id = Attribute('id')
type = Attribute(XSI('type'), [DC('date'), DC('format'), DC('type')])
lang = Attribute(XML('lang'), [DC('contributor'), DC('coverage'),
DC('creator'), DC('publisher'),
DC('relation'), DC('rights'),
DC('source'), DC('subject'),
OPF('meta')])
def __getitem__(self, key):
return self.attrib[key]