X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/b6ec0976a383cc1823f4a199bc3e6dc40880b049..b6b6be3f7ad18e33d80093d14096897aea1feb2c:/librarian/dcparser.py diff --git a/librarian/dcparser.py b/librarian/dcparser.py index 5492f7a..eddd8e5 100644 --- a/librarian/dcparser.py +++ b/librarian/dcparser.py @@ -79,87 +79,120 @@ def as_unicode(text): else: return text.decode('utf-8') +def as_wluri_strict(text): + return WLURI.strict(text) + class Field(object): - def __init__(self, uri, attr_name, type=as_unicode, multiple=False, salias=None, **kwargs): + def __init__(self, uri, attr_name, validator=as_unicode, strict=None, multiple=False, salias=None, **kwargs): self.uri = uri self.name = attr_name - self.validator = type + self.validator = validator + self.strict = strict self.multiple = multiple self.salias = salias self.required = kwargs.get('required', True) and not kwargs.has_key('default') self.default = kwargs.get('default', [] if multiple else [None]) - def validate_value(self, val): + def validate_value(self, val, strict=False): + if strict and self.strict is not None: + validator = self.strict + else: + validator = self.validator try: if self.multiple: - if self.validator is None: + if validator is None: return val - return [ self.validator(v) if v is not None else v for v in val ] + return [ validator(v) if v is not None else v for v in val ] elif len(val) > 1: raise ValidationError("Multiple values not allowed for field '%s'" % self.uri) elif len(val) == 0: raise ValidationError("Field %s has no value to assign. Check your defaults." % self.uri) else: - if self.validator is None or val[0] is None: + if validator is None or val[0] is None: return val[0] - return self.validator(val[0]) + return validator(val[0]) except ValueError, e: raise ValidationError("Field '%s' - invald value: %s" % (self.uri, e.message)) - def validate(self, fdict): + def validate(self, fdict, fallbacks=None, strict=False): + if fallbacks is None: + fallbacks = {} if not fdict.has_key(self.uri): if not self.required: - f = self.default + # Accept single value for single fields and saliases. + if self.name in fallbacks: + if self.multiple: + f = fallbacks[self.name] + else: + f = [fallbacks[self.name]] + elif self.salias and self.salias in fallbacks: + f = [fallbacks[self.salias]] + else: + f = self.default else: raise ValidationError("Required field %s not found" % self.uri) else: f = fdict[self.uri] - return self.validate_value(f) + return self.validate_value(f, strict=strict) + + def __eq__(self, other): + if isinstance(other, Field) and other.name == self.name: + return True + return False + +class DCInfo(type): + def __new__(meta, classname, bases, class_dict): + fields = list(class_dict['FIELDS']) + for base in bases[::-1]: + if hasattr(base, 'FIELDS'): + for field in base.FIELDS[::-1]: + try: + fields.index(field) + except ValueError: + fields.insert(0, field) + class_dict['FIELDS'] = tuple(fields) + return super(DCInfo, meta).__new__(meta, classname, bases, class_dict) + + +class WorkInfo(object): + __metaclass__ = DCInfo -class BookInfo(object): FIELDS = ( - Field( DCNS('creator'), 'author', as_person), + Field( DCNS('creator'), 'authors', as_person, salias='author', multiple=True), Field( DCNS('title'), 'title'), - Field( DCNS('subject.period'), 'epochs', salias='epoch', multiple=True), - Field( DCNS('subject.type'), 'kinds', salias='kind', multiple=True), - Field( DCNS('subject.genre'), 'genres', salias='genre', multiple=True), - Field( DCNS('audience'), 'audiences', salias='audience', multiple=True, - required=False), - Field( DCNS('date'), 'created_at', as_date), - Field( DCNS('date.pd'), 'released_to_public_domain_at', as_date, required=False), + Field( DCNS('type'), 'type', required=False, multiple=True), + Field( DCNS('contributor.editor'), 'editors', \ as_person, salias='editor', multiple=True, default=[]), - Field( DCNS('contributor.translator'), 'translators', \ - as_person, salias='translator', multiple=True, default=[]), Field( DCNS('contributor.technical_editor'), 'technical_editors', as_person, salias='technical_editor', multiple=True, default=[]), + + Field( DCNS('date'), 'created_at', as_date), + Field( DCNS('date.pd'), 'released_to_public_domain_at', as_date, required=False), Field( DCNS('publisher'), 'publisher'), + + Field( DCNS('language'), 'language'), + Field( DCNS('description'), 'description', required=False), + Field( DCNS('source'), 'source_name', required=False), Field( DCNS('source.URL'), 'source_url', required=False), - Field( DCNS('identifier.url'), 'url'), - Field( DCNS('relation.hasPart'), 'parts', multiple=True, required=False), + Field( DCNS('identifier.url'), 'url', WLURI, strict=as_wluri_strict), Field( DCNS('rights.license'), 'license', required=False), Field( DCNS('rights'), 'license_description'), - Field( DCNS('language'), 'language'), - Field( DCNS('description'), 'description', required=False), ) - @property - def slug(self): - return WLURI(self.url).slug - @classmethod - def from_string(cls, xml): + def from_string(cls, xml, *args, **kwargs): from StringIO import StringIO - return cls.from_file(StringIO(xml)) + return cls.from_file(StringIO(xml), *args, **kwargs) @classmethod - def from_file(cls, xmlfile): + def from_file(cls, xmlfile, *args, **kwargs): desc_tag = None try: iter = etree.iterparse(xmlfile, ['start', 'end']) @@ -180,17 +213,17 @@ class BookInfo(object): # if there is no end, Expat should yell at us with an ExpatError # extract data from the element and make the info - return cls.from_element(desc_tag) + return cls.from_element(desc_tag, *args, **kwargs) except XMLSyntaxError, e: raise ParseError(e) except ExpatError, e: raise ParseError(e) @classmethod - def from_element(cls, rdf_tag): + def from_element(cls, rdf_tag, *args, **kwargs): # the tree is already parsed, so we don't need to worry about Expat errors field_dict = {} - desc = rdf_tag.find(".//" + RDFNS('Description') ) + desc = rdf_tag.find(".//" + RDFNS('Description')) if desc is None: raise NoDublinCore("No DublinCore section found.") @@ -200,9 +233,9 @@ class BookInfo(object): fv.append(e.text) field_dict[e.tag] = fv - return cls( desc.attrib, field_dict ) + return cls(desc.attrib, field_dict, *args, **kwargs) - def __init__(self, rdf_attrs, dc_fields): + def __init__(self, rdf_attrs, dc_fields, fallbacks=None, strict=False): """rdf_attrs should be a dictionary-like object with any attributes of the RDF:Description. dc_fields - dictionary mapping DC fields (with namespace) to list of text values for the given field. """ @@ -211,7 +244,8 @@ class BookInfo(object): self.fmap = {} for field in self.FIELDS: - value = field.validate( dc_fields ) + value = field.validate(dc_fields, fallbacks=fallbacks, + strict=strict) setattr(self, 'prop_' + field.name, value) self.fmap[field.name] = field if field.salias: self.fmap[field.salias] = field @@ -226,7 +260,7 @@ class BookInfo(object): if not field.multiple: raise "OUCH!! for field %s" % name - return value[0] + return value[0] if value else None except (KeyError, AttributeError): return object.__getattribute__(self, name) @@ -282,7 +316,6 @@ class BookInfo(object): return root - def serialize(self): rdf = {} rdf['about'] = { 'uri': RDFNS('about'), 'value': self.about } @@ -320,5 +353,31 @@ class BookInfo(object): return result -def parse(file_name): - return BookInfo.from_file(file_name) + +class BookInfo(WorkInfo): + FIELDS = ( + Field( DCNS('audience'), 'audiences', salias='audience', multiple=True, + required=False), + + Field( DCNS('subject.period'), 'epochs', salias='epoch', multiple=True, + required=False), + Field( DCNS('subject.type'), 'kinds', salias='kind', multiple=True, + required=False), + Field( DCNS('subject.genre'), 'genres', salias='genre', multiple=True, + required=False), + + Field( DCNS('contributor.translator'), 'translators', \ + as_person, salias='translator', multiple=True, default=[]), + Field( DCNS('relation.hasPart'), 'parts', + WLURI, strict=as_wluri_strict, multiple=True, required=False), + Field( DCNS('relation.isVariantOf'), 'variant_of', + WLURI, strict=as_wluri_strict, required=False), + + Field( DCNS('relation.coverImage.url'), 'cover_url', required=False), + Field( DCNS('relation.coverImage.attribution'), 'cover_by', required=False), + Field( DCNS('relation.coverImage.source'), 'cover_source', required=False), + ) + + +def parse(file_name, cls=BookInfo): + return cls.from_file(file_name)