# -*- 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
+from librarian import (ValidationError, NoDublinCore, ParseError, DCNS, RDFNS,
+ WLURI)
import lxml.etree as etree # ElementTree API using libxml2
from lxml.etree import XMLSyntaxError
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(',') ]
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)
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("Mulitply values not allowed for field '%s'" % self.uri)
+ 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)
-# ==========
-# = Parser =
-# ==========
+ def __eq__(self, other):
+ if isinstance(other, Field) and other.name == self.name:
+ return True
+ return False
-class XMLNamespace(object):
- '''Represents XML namespace.'''
-
- def __init__(self, uri):
- self.uri = uri
- def __call__(self, tag):
- return '{%s}%s' % (self.uri, tag)
+class DCInfo(type):
+ def __new__(meta, classname, bases, class_dict):
+ fields = list(class_dict['FIELDS'])
- def __contains__(self, tag):
- return tag.startswith(str(self))
+ 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)
- def __repr__(self):
- return 'XMLNamespace(%r)' % self.uri
-
- def __str__(self):
- return '%s' % self.uri
+ class_dict['FIELDS'] = tuple(fields)
+ return super(DCInfo, meta).__new__(meta, classname, bases, class_dict)
-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 WorkInfo(object):
+ __metaclass__ = DCInfo
+
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'), 'authors', as_person, salias='author', multiple=True, required=False),
+ 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( DC('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('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, strict=as_wluri_strict, required=False),
+ Field( DCNS('rights.license'), 'license', required=False),
+ Field( DCNS('rights'), 'license_description'),
)
@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):
- desc_tag = None
+ def from_file(cls, xmlfile, *args, **kwargs):
+ desc_tag = None
try:
- iter = etree.iterparse(xmlfile, ['start', 'end'])
+ 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
# 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
-
+
# 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(".//" + cls.RDF('Description') )
-
+ desc = rdf_tag.find(".//" + RDFNS('Description'))
+
if desc is None:
raise NoDublinCore("No DublinCore section found.")
fv = field_dict.get(e.tag, [])
fv.append(e.text)
field_dict[e.tag] = fv
-
- return cls( desc.attrib, field_dict )
- def __init__(self, rdf_attrs, dc_fields):
+ return cls(desc.attrib, field_dict, *args, **kwargs)
+
+ 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
+ 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:
- 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
else: # singular alias
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)
return object.__setattr__(self, name, newvalue)
def update(self, field_dict):
- """Update using field_dict. Verify correctness, but don't check if all
+ """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):
"""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(self.RDF('RDF'))
+ root = etree.Element(RDFNS('RDF'))
else:
- root = parent.makeelement(self.RDF('RDF'))
+ root = parent.makeelement(RDFNS('RDF'))
+
+ description = etree.SubElement(root, RDFNS('Description'))
- description = etree.SubElement(root, self.RDF('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)
if v is not None:
if len(v) == 0: continue
for x in v:
e = etree.Element(field.uri)
- e.text = unicode(x)
+ 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:
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 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] = v
-
+ if v is not None: result[field.salias] = unicode(v)
+
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)
fnp / librarian.git / blobdiff