X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/6642c1c71c5c6ce6ef3401c8c9da84cf076b018b..f8e5f031c04122d65d1066077be3920ae95518ae:/librarian/dcparser.py diff --git a/librarian/dcparser.py b/librarian/dcparser.py index 830b089..80d6247 100644 --- a/librarian/dcparser.py +++ b/librarian/dcparser.py @@ -3,7 +3,7 @@ from xml.parsers.expat import ExpatError from datetime import date import time -from librarian import ValidationError, NoDublinCore +from librarian import ValidationError, NoDublinCore, ParseError, DCNS, RDFNS import lxml.etree as etree # ElementTree API using libxml2 from lxml.etree import XMLSyntaxError @@ -105,54 +105,31 @@ class Field(object): return self.validate_value(f) -# ========== -# = Parser = -# ========== -class XMLNamespace(object): - '''Represents XML namespace.''' - - def __init__(self, uri): - self.uri = uri - - def __call__(self, tag): - return '{%s}%s' % (self.uri, tag) - def __contains__(self, tag): - return tag.startswith(str(self)) - def __repr__(self): - return 'XMLNamespace(%r)' % self.uri - - def __str__(self): - return '%s' % self.uri - - -class BookInfo(object): - RDF = XMLNamespace('http://www.w3.org/1999/02/22-rdf-syntax-ns#') - DC = XMLNamespace('http://purl.org/dc/elements/1.1/') - +class BookInfo(object): FIELDS = ( - Field( DC('creator'), 'author', as_person), - Field( DC('title'), 'title'), - Field( DC('subject.period'), 'epoches', salias='epoch', multiple=True), - Field( DC('subject.type'), 'kinds', salias='kind', multiple=True), - Field( DC('subject.genre'), 'genres', salias='genre', multiple=True), - Field( DC('date'), 'created_at', as_date), - Field( DC('date.pd'), 'released_to_public_domain_at', as_date, required=False), - Field( DC('contributor.editor'), 'editors', \ + Field( DCNS('creator'), 'author', as_person), + 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('date'), 'created_at', as_date), + Field( DCNS('date.pd'), 'released_to_public_domain_at', as_date, required=False), + Field( DCNS('contributor.editor'), 'editors', \ as_person, salias='editor', multiple=True, default=[]), - Field( DC('contributor.translator'), 'translators', \ + Field( DCNS('contributor.translator'), 'translators', \ as_person, salias='translator', multiple=True, default=[]), - Field( DC('contributor.technical_editor'), 'technical_editors', + Field( DCNS('contributor.technical_editor'), 'technical_editors', as_person, salias='technical_editor', multiple=True, default=[]), - Field( DC('publisher'), 'publisher'), - Field( DC('source'), 'source_name', required=False), - Field( DC('source.URL'), 'source_url', required=False), - Field( DC('identifier.url'), 'url'), - Field( DC('relation.hasPart'), 'parts', multiple=True, required=False), - Field( DC('rights.license'), 'license', required=False), - Field( DC('rights'), 'license_description'), + Field( DCNS('publisher'), 'publisher'), + 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('rights.license'), 'license', required=False), + Field( DCNS('rights'), 'license_description'), ) @classmethod @@ -166,7 +143,7 @@ class BookInfo(object): try: iter = etree.iterparse(xmlfile, ['start', 'end']) for (event, element) in iter: - if element.tag == cls.RDF('RDF') and event == 'start': + if element.tag == RDFNS('RDF') and event == 'start': desc_tag = element break @@ -176,7 +153,7 @@ class BookInfo(object): # continue 'till the end of RDF section for (event, element) in iter: - if element.tag == cls.RDF('RDF') and event == 'end': + if element.tag == RDFNS('RDF') and event == 'end': break # if there is no end, Expat should yell at us with an ExpatError @@ -192,7 +169,7 @@ class BookInfo(object): def from_element(cls, rdf_tag): # the tree is already parsed, so we don't need to worry about Expat errors field_dict = {} - desc = rdf_tag.find(".//" + cls.RDF('Description') ) + desc = rdf_tag.find(".//" + RDFNS('Description') ) if desc is None: raise NoDublinCore("No DublinCore section found.") @@ -202,14 +179,14 @@ class BookInfo(object): fv.append(e.text) field_dict[e.tag] = fv - return cls( desc.attrib, field_dict ) + return cls( desc.attrib, field_dict ) def __init__(self, rdf_attrs, dc_fields): """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. """ - self.about = rdf_attrs.get(self.RDF('about')) + self.about = rdf_attrs.get(RDFNS('about')) self.fmap = {} for field in self.FIELDS: @@ -258,14 +235,14 @@ class BookInfo(object): #etree._namespace_map[str(self.DC)] = 'dc' if parent is None: - root = etree.Element(self.RDF('RDF')) + root = etree.Element(RDFNS('RDF')) else: - root = parent.makeelement(self.RDF('RDF')) + root = parent.makeelement(RDFNS('RDF')) - description = etree.SubElement(root, self.RDF('Description')) + description = etree.SubElement(root, RDFNS('Description')) if self.about: - description.set(self.RDF('about'), self.about) + description.set(RDFNS('about'), self.about) for field in self.FIELDS: v = getattr(self, field.name, None) @@ -283,6 +260,25 @@ class BookInfo(object): return root + + def serialize(self): + rdf = {} + rdf['about'] = { 'uri': RDFNS('about'), 'value': self.about } + + dc = {} + for field in self.FIELDS: + v = getattr(self, field.name, None) + if v is not None: + if field.multiple: + if len(v) == 0: continue + v = [ unicode(x) for x in v if v is not None ] + else: + v = unicode(v) + + dc[field.name] = {'uri': field.uri, 'value': v} + rdf['fields'] = dc + return rdf + def to_dict(self): result = {'about': self.about} for field in self.FIELDS: @@ -291,14 +287,14 @@ class BookInfo(object): if v is not None: if field.multiple: if len(v) == 0: continue - v = [ unicode(x) for x in v ] + v = [ unicode(x) for x in v if v is not None ] else: v = unicode(v) result[field.name] = v if field.salias: v = getattr(self, field.salias) - if v is not None: result[field.salias] = v + if v is not None: result[field.salias] = unicode(v) return result