X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/0718c9d23a5791aa51bc11bba6a011fe9a8a616d..fefdce4e24f9e397df5538fe6e7f54b5ece4d841:/librarian/dcparser.py?ds=inline diff --git a/librarian/dcparser.py b/librarian/dcparser.py deleted file mode 100644 index 534cd27..0000000 --- a/librarian/dcparser.py +++ /dev/null @@ -1,363 +0,0 @@ -# -*- coding: utf-8 -*- -# -# This file is part of Librarian, licensed under GNU Affero GPLv3 or later. -# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information. -# -from xml.parsers.expat import ExpatError -from datetime import date -import time - -from librarian import (ValidationError, NoDublinCore, ParseError, DCNS, RDFNS, - WLURI) - -import lxml.etree as etree # ElementTree API using libxml2 -from lxml.etree import XMLSyntaxError - - -# ============== -# = Converters = -# ============== -class Person(object): - """Single person with last name and a list of first names.""" - def __init__(self, last_name, *first_names): - self.last_name = last_name - self.first_names = first_names - - @classmethod - def from_text(cls, text): - parts = [ token.strip() for token in text.split(',') ] - if len(parts) == 1: - surname = parts[0] - names = [] - elif len(parts) != 2: - raise ValueError("Invalid person name. There should be at most one comma: \"%s\"." % text) - else: - surname = parts[0] - if len(parts[1]) == 0: - # there is no non-whitespace data after the comma - raise ValueError("Found a comma, but no names given: \"%s\" -> %r." % (text, parts)) - names = [ name for name in parts[1].split() if len(name) ] # all non-whitespace tokens - return cls(surname, *names) - - def readable(self): - return u" ".join(self.first_names + (self.last_name,)) - - def __eq__(self, right): - return self.last_name == right.last_name and self.first_names == right.first_names - - def __cmp__(self, other): - return cmp((self.last_name, self.first_names), (other.last_name, other.first_names)) - - def __hash__(self): - return hash((self.last_name, self.first_names)) - - def __unicode__(self): - if len(self.first_names) > 0: - return '%s, %s' % (self.last_name, ' '.join(self.first_names)) - else: - return self.last_name - - def __repr__(self): - return 'Person(last_name=%r, first_names=*%r)' % (self.last_name, self.first_names) - -def as_date(text): - try: - try: - t = time.strptime(text, '%Y-%m-%d') - except ValueError: - t = time.strptime(text, '%Y') - return date(t[0], t[1], t[2]) - except ValueError, e: - raise ValueError("Unrecognized date format. Try YYYY-MM-DD or YYYY.") - -def as_person(text): - return Person.from_text(text) - -def as_unicode(text): - if isinstance(text, unicode): - return text - else: - return text.decode('utf-8') - -class Field(object): - def __init__(self, uri, attr_name, type=as_unicode, multiple=False, salias=None, **kwargs): - self.uri = uri - self.name = attr_name - self.validator = type - 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): - try: - if self.multiple: - if self.validator is None: - return val - return [ self.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: - return val[0] - return self.validator(val[0]) - except ValueError, e: - raise ValidationError("Field '%s' - invald value: %s" % (self.uri, e.message)) - - def validate(self, fdict): - if not fdict.has_key(self.uri): - if not self.required: - f = self.default - else: - raise ValidationError("Required field %s not found" % self.uri) - else: - f = fdict[self.uri] - - return self.validate_value(f) - - 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 - - FIELDS = ( - Field( DCNS('creator'), 'authors', as_person, salias='author', multiple=True), - Field( DCNS('title'), 'title'), - Field( DCNS('type'), 'type', required=False, multiple=True), - - Field( DCNS('contributor.editor'), 'editors', \ - as_person, salias='editor', 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', WLURI), - Field( DCNS('rights.license'), 'license', required=False), - Field( DCNS('rights'), 'license_description'), - ) - - @classmethod - def from_string(cls, xml): - from StringIO import StringIO - return cls.from_file(StringIO(xml)) - - @classmethod - def from_file(cls, xmlfile): - desc_tag = None - try: - iter = etree.iterparse(xmlfile, ['start', 'end']) - for (event, element) in iter: - if element.tag == RDFNS('RDF') and event == 'start': - desc_tag = element - break - - if desc_tag is None: - raise NoDublinCore("DublinCore section not found. \ - Check if there are rdf:RDF and rdf:Description tags.") - - # continue 'till the end of RDF section - for (event, element) in iter: - if element.tag == RDFNS('RDF') and event == 'end': - break - - # 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) - except XMLSyntaxError, e: - raise ParseError(e) - except ExpatError, e: - raise ParseError(e) - - @classmethod - 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(".//" + RDFNS('Description')) - - if desc is None: - raise NoDublinCore("No DublinCore section found.") - - for e in desc.getchildren(): - fv = field_dict.get(e.tag, []) - fv.append(e.text) - field_dict[e.tag] = fv - - print 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(RDFNS('about')) - self.fmap = {} - - for field in self.FIELDS: - value = field.validate( dc_fields ) - setattr(self, 'prop_' + field.name, value) - self.fmap[field.name] = field - if field.salias: self.fmap[field.salias] = field - - self.validate() - - def validate(self): - self.url.validate_language(self.language) - - def __getattribute__(self, name): - try: - field = object.__getattribute__(self, 'fmap')[name] - value = object.__getattribute__(self, 'prop_'+field.name) - if field.name == name: - return value - else: # singular alias - if not field.multiple: - raise "OUCH!! for field %s" % name - - return value[0] - except (KeyError, AttributeError): - return object.__getattribute__(self, name) - - def __setattr__(self, name, newvalue): - try: - field = object.__getattribute__(self, 'fmap')[name] - if field.name == name: - object.__setattr__(self, 'prop_'+field.name, newvalue) - else: # singular alias - if not field.multiple: - raise "OUCH! while setting field %s" % name - - object.__setattr__(self, 'prop_'+field.name, [newvalue]) - except (KeyError, AttributeError): - return object.__setattr__(self, name, newvalue) - - def update(self, field_dict): - """Update using field_dict. Verify correctness, but don't check if all - required fields are present.""" - for field in self.FIELDS: - if field_dict.has_key(field.name): - setattr(self, field.name, field_dict[field.name]) - - def to_etree(self, parent = None): - """XML representation of this object.""" - #etree._namespace_map[str(self.RDF)] = 'rdf' - #etree._namespace_map[str(self.DC)] = 'dc' - - if parent is None: - root = etree.Element(RDFNS('RDF')) - else: - root = parent.makeelement(RDFNS('RDF')) - - description = etree.SubElement(root, RDFNS('Description')) - - if self.about: - description.set(RDFNS('about'), self.about) - - for field in self.FIELDS: - v = getattr(self, field.name, None) - if v is not None: - if field.multiple: - if len(v) == 0: continue - for x in v: - e = etree.Element(field.uri) - if x is not None: - e.text = unicode(x) - description.append(e) - else: - e = etree.Element(field.uri) - e.text = unicode(v) - description.append(e) - - 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 x 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: - 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 x 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] = unicode(v) - - return result - - -class BookInfo(WorkInfo): - FIELDS = ( - Field( DCNS('audience'), 'audiences', salias='audience', multiple=True, - required=False), - - 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('contributor.translator'), 'translators', \ - as_person, salias='translator', multiple=True, default=[]), - Field( DCNS('relation.hasPart'), 'parts', WLURI, multiple=True, required=False), - - Field( DCNS('relation.cover_image.url'), 'cover_url', required=False), - Field( DCNS('relation.cover_image.attribution'), 'cover_by', required=False), - Field( DCNS('relation.cover_image.source'), 'cover_source', required=False), - ) - - -def parse(file_name, cls=BookInfo): - return cls.from_file(file_name)