1 # -*- coding: utf-8 -*-
2 from __future__ import unicode_literals
4 from operator import and_
6 from .dcparser import Field, WorkInfo, DCNS
7 from librarian import (RDFNS, ValidationError, NoDublinCore, ParseError, WLURI)
8 from xml.parsers.expat import ExpatError
10 from lxml import etree
11 from lxml.etree import (XMLSyntaxError, XSLTApplyError, Element)
16 class WLPictureURI(WLURI):
17 _re_wl_uri = re.compile(
18 'http://wolnelektury.pl/katalog/obraz/(?P<slug>[-a-z0-9]+)/?$'
22 def from_slug(cls, slug):
23 uri = 'http://wolnelektury.pl/katalog/obraz/%s/' % slug
27 def as_wlpictureuri_strict(text):
28 return WLPictureURI.strict(text)
31 class PictureInfo(WorkInfo):
33 Dublin core metadata for a picture
36 Field(DCNS('language'), 'language', required=False),
37 Field(DCNS('subject.period'), 'epochs', salias='epoch', multiple=True),
38 Field(DCNS('subject.type'), 'kinds', salias='kind', multiple=True),
39 Field(DCNS('subject.genre'), 'genres', salias='genre', multiple=True,
41 Field(DCNS('subject.style'), 'styles', salias='style', multiple=True,
44 Field(DCNS('format.dimensions'), 'dimensions', required=False),
45 Field(DCNS('format.checksum.sha1'), 'sha1', required=True),
46 Field(DCNS('description.medium'), 'medium', required=False),
47 Field(DCNS('description.dimensions'), 'original_dimensions',
49 Field(DCNS('format'), 'mime_type', required=False),
50 Field(DCNS('identifier.url'), 'url', WLPictureURI,
51 strict=as_wlpictureuri_strict)
55 class ImageStore(object):
56 EXT = ['gif', 'jpeg', 'png', 'swf', 'psd', 'bmp'
57 'tiff', 'tiff', 'jpc', 'jp2', 'jpf', 'jb2', 'swc',
58 'aiff', 'wbmp', 'xbm']
59 MIME = ['image/gif', 'image/jpeg', 'image/png',
60 'application/x-shockwave-flash', 'image/psd', 'image/bmp',
61 'image/tiff', 'image/tiff', 'application/octet-stream',
62 'image/jp2', 'application/octet-stream',
63 'application/octet-stream', 'application/x-shockwave-flash',
64 'image/iff', 'image/vnd.wap.wbmp', 'image/xbm']
66 def __init__(self, dir_):
67 super(ImageStore, self).__init__()
70 def path(self, slug, mime_type):
72 Finds file by slug and mime type in our iamge store.
73 Returns a file objects (perhaps should return a filename?)
76 i = self.MIME.index(mime_type)
79 "Picture %s has unknown mime type: %s"
83 err.mime_type = mime_type
86 # add some common extensions tiff->tif, jpeg->jpg
87 return path.join(self.dir, slug + '.' + ext)
90 class WLPicture(object):
91 def __init__(self, edoc, parse_dublincore=True, image_store=None):
93 self.image_store = image_store
95 root_elem = edoc.getroot()
97 dc_path = './/' + RDFNS('RDF')
99 if root_elem.tag != 'picture':
100 raise ValidationError(
101 "Invalid root element. Found '%s', should be 'picture'"
106 self.rdf_elem = root_elem.find(dc_path)
108 if self.rdf_elem is None:
110 "Document has no DublinCore - which is required."
113 self.picture_info = PictureInfo.from_element(self.rdf_elem)
115 self.picture_info = None
119 def from_bytes(cls, xml, *args, **kwargs):
120 return cls.from_file(six.BytesIO(xml), *args, **kwargs)
123 def from_file(cls, xmlfile, parse_dublincore=True, image_store=None):
125 # first, prepare for parsing
126 if isinstance(xmlfile, six.text_type):
127 file = open(xmlfile, 'rb')
133 data = xmlfile.read()
135 if not isinstance(data, six.text_type):
136 data = data.decode('utf-8')
138 data = data.replace(u'\ufeff', '')
140 # assume images are in the same directory
141 if image_store is None and getattr(xmlfile, 'name', None):
142 image_store = ImageStore(path.dirname(xmlfile.name))
145 parser = etree.XMLParser(remove_blank_text=False)
146 tree = etree.parse(six.BytesIO(data.encode('utf-8')), parser)
148 me = cls(tree, parse_dublincore=parse_dublincore,
149 image_store=image_store)
152 except (ExpatError, XMLSyntaxError, XSLTApplyError) as e:
157 if self.picture_info is None:
159 "DC is not loaded, hence we don't know the image type."
161 return self.picture_info.mime_type
165 return self.picture_info.url.slug
168 def image_path(self):
169 if self.image_store is None:
170 raise ValueError("No image store associated with whis WLPicture.")
172 return self.image_store.path(self.slug, self.mime_type)
174 def image_file(self, *args, **kwargs):
175 return open(self.image_path, 'rb', *args, **kwargs)
177 def get_sem_coords(self, sem):
178 area = sem.find("div[@type='rect']")
180 area = sem.find("div[@type='whole']")
181 return [[0, 0], [-1, -1]]
183 def has_all_props(node, props):
184 return six.moves.reduce(
185 and_, map(lambda prop: prop in node.attrib, props)
188 if not has_all_props(area, ['x1', 'x2', 'y1', 'y2']):
191 def n(prop): return int(area.get(prop))
192 return [[n('x1'), n('y1')], [n('x2'), n('y2')]]
196 Iterates the parts of this picture and returns them
199 # omg no support for //sem[(@type='theme') or (@type='object')] ?
200 for part in list(self.edoc.iterfind("//sem[@type='theme']")) +\
201 list(self.edoc.iterfind("//sem[@type='object']")):
202 pd = {'type': part.get('type')}
204 coords = self.get_sem_coords(part)
207 pd['coords'] = coords
210 if not isinstance(x, six.text_type):
211 return x.decode('utf-8')
215 part.attrib['type'] == 'object'
216 and want_unicode(part.attrib.get('object', u''))
220 part.attrib['type'] == 'theme'
221 and [part.attrib.get('theme', u'')]
226 def load_frame_info(self):
227 k = self.edoc.find("//sem[@object='kadr']")
230 clip = self.get_sem_coords(k)
232 frm = Element("sem", {"type": "frame"})
233 frm.append(k.iter("div").next())
234 self.edoc.getroot().append(frm)
235 k.getparent().remove(k)
237 frm = self.edoc.find("//sem[@type='frame']")
239 self.frame = self.get_sem_coords(frm)