--- /dev/null
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from operator import and_
+
+from .dcparser import Field, WorkInfo, DCNS
+from librarian import (RDFNS, ValidationError, NoDublinCore, ParseError, WLURI)
+from xml.parsers.expat import ExpatError
+from os import path
+from lxml import etree
+from lxml.etree import (XMLSyntaxError, XSLTApplyError, Element)
+import re
+import six
+
+
+class WLPictureURI(WLURI):
+ _re_wl_uri = re.compile('http://wolnelektury.pl/katalog/obraz/(?P<slug>[-a-z0-9]+)/?$')
+
+ @classmethod
+ def from_slug(cls, slug):
+ uri = 'http://wolnelektury.pl/katalog/obraz/%s/' % slug
+ return cls(uri)
+
+
+def as_wlpictureuri_strict(text):
+ return WLPictureURI.strict(text)
+
+
+class PictureInfo(WorkInfo):
+ """
+ Dublin core metadata for a picture
+ """
+ FIELDS = (
+ Field(DCNS('language'), 'language', 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, required=False),
+ Field(DCNS('subject.style'), 'styles', salias='style', multiple=True, required=False),
+
+ Field(DCNS('format.dimensions'), 'dimensions', required=False),
+ Field(DCNS('format.checksum.sha1'), 'sha1', required=True),
+ Field(DCNS('description.medium'), 'medium', required=False),
+ Field(DCNS('description.dimensions'), 'original_dimensions', required=False),
+ Field(DCNS('format'), 'mime_type', required=False),
+ Field(DCNS('identifier.url'), 'url', WLPictureURI, strict=as_wlpictureuri_strict)
+ )
+
+
+class ImageStore(object):
+ EXT = ['gif', 'jpeg', 'png', 'swf', 'psd', 'bmp'
+ 'tiff', 'tiff', 'jpc', 'jp2', 'jpf', 'jb2', 'swc',
+ 'aiff', 'wbmp', 'xbm']
+ MIME = ['image/gif', 'image/jpeg', 'image/png',
+ 'application/x-shockwave-flash', 'image/psd', 'image/bmp',
+ 'image/tiff', 'image/tiff', 'application/octet-stream',
+ 'image/jp2', 'application/octet-stream', 'application/octet-stream',
+ 'application/x-shockwave-flash', 'image/iff', 'image/vnd.wap.wbmp', 'image/xbm']
+
+ def __init__(self, dir_):
+ super(ImageStore, self).__init__()
+ self.dir = dir_
+
+ def path(self, slug, mime_type):
+ """
+ Finds file by slug and mime type in our iamge store.
+ Returns a file objects (perhaps should return a filename?)
+ """
+ try:
+ i = self.MIME.index(mime_type)
+ except ValueError:
+ err = ValueError("Picture %s has unknown mime type: %s" % (slug, mime_type))
+ err.slug = slug
+ err.mime_type = mime_type
+ raise err
+ ext = self.EXT[i]
+ # add some common extensions tiff->tif, jpeg->jpg
+ return path.join(self.dir, slug + '.' + ext)
+
+
+class WLPicture(object):
+ def __init__(self, edoc, parse_dublincore=True, image_store=None):
+ self.edoc = edoc
+ self.image_store = image_store
+
+ root_elem = edoc.getroot()
+
+ dc_path = './/' + RDFNS('RDF')
+
+ if root_elem.tag != 'picture':
+ raise ValidationError("Invalid root element. Found '%s', should be 'picture'" % root_elem.tag)
+
+ if parse_dublincore:
+ self.rdf_elem = root_elem.find(dc_path)
+
+ if self.rdf_elem is None:
+ raise NoDublinCore('Document has no DublinCore - which is required.')
+
+ self.picture_info = PictureInfo.from_element(self.rdf_elem)
+ else:
+ self.picture_info = None
+ self.frame = None
+
+ @classmethod
+ def from_bytes(cls, xml, *args, **kwargs):
+ return cls.from_file(six.BytesIO(xml), *args, **kwargs)
+
+ @classmethod
+ def from_file(cls, xmlfile, parse_dublincore=True, image_store=None):
+
+ # first, prepare for parsing
+ if isinstance(xmlfile, six.text_type):
+ file = open(xmlfile, 'rb')
+ try:
+ data = file.read()
+ finally:
+ file.close()
+ else:
+ data = xmlfile.read()
+
+ if not isinstance(data, six.text_type):
+ data = data.decode('utf-8')
+
+ data = data.replace(u'\ufeff', '')
+
+ # assume images are in the same directory
+ if image_store is None and getattr(xmlfile, 'name', None):
+ image_store = ImageStore(path.dirname(xmlfile.name))
+
+ try:
+ parser = etree.XMLParser(remove_blank_text=False)
+ tree = etree.parse(six.BytesIO(data.encode('utf-8')), parser)
+
+ me = cls(tree, parse_dublincore=parse_dublincore, image_store=image_store)
+ me.load_frame_info()
+ return me
+ except (ExpatError, XMLSyntaxError, XSLTApplyError) as e:
+ raise ParseError(e)
+
+ @property
+ def mime_type(self):
+ if self.picture_info is None:
+ raise ValueError('DC is not loaded, hence we don\'t know the image type')
+ return self.picture_info.mime_type
+
+ @property
+ def slug(self):
+ return self.picture_info.url.slug
+
+ @property
+ def image_path(self):
+ if self.image_store is None:
+ raise ValueError("No image store associated with whis WLPicture.")
+
+ return self.image_store.path(self.slug, self.mime_type)
+
+ def image_file(self, *args, **kwargs):
+ return open(self.image_path, 'rb', *args, **kwargs)
+
+ def get_sem_coords(self, sem):
+ area = sem.find("div[@type='rect']")
+ if area is None:
+ area = sem.find("div[@type='whole']")
+ return [[0, 0], [-1, -1]]
+
+ def has_all_props(node, props):
+ return reduce(and_, map(lambda prop: prop in node.attrib, props))
+
+ if not has_all_props(area, ['x1', 'x2', 'y1', 'y2']):
+ return None
+
+ def n(prop): return int(area.get(prop))
+ return [[n('x1'), n('y1')], [n('x2'), n('y2')]]
+
+ def partiter(self):
+ """
+ Iterates the parts of this picture and returns them and their metadata
+ """
+ # omg no support for //sem[(@type='theme') or (@type='object')] ?
+ for part in list(self.edoc.iterfind("//sem[@type='theme']")) +\
+ list(self.edoc.iterfind("//sem[@type='object']")):
+ pd = {'type': part.get('type')}
+
+ coords = self.get_sem_coords(part)
+ if coords is None:
+ continue
+ pd['coords'] = coords
+
+ def want_unicode(x):
+ if not isinstance(x, six.text_type):
+ return x.decode('utf-8')
+ else:
+ return x
+ pd['object'] = part.attrib['type'] == 'object' and want_unicode(part.attrib.get('object', u'')) or None
+ pd['themes'] = part.attrib['type'] == 'theme' and [part.attrib.get('theme', u'')] or []
+ yield pd
+
+ def load_frame_info(self):
+ k = self.edoc.find("//sem[@object='kadr']")
+
+ if k is not None:
+ clip = self.get_sem_coords(k)
+ self.frame = clip
+ frm = Element("sem", {"type": "frame"})
+ frm.append(k.iter("div").next())
+ self.edoc.getroot().append(frm)
+ k.getparent().remove(k)
+ else:
+ frm = self.edoc.find("//sem[@type='frame']")
+ if frm:
+ self.frame = self.get_sem_coords(frm)
+ else:
+ self.frame = None
+ return self
fnp / librarian.git / blobdiff