X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/477d10c7febb6f2225eb9df94d0729bbf230cd15..fefdce4e24f9e397df5538fe6e7f54b5ece4d841:/librarian/picture.py diff --git a/librarian/picture.py b/librarian/picture.py deleted file mode 100644 index 6fc40b1..0000000 --- a/librarian/picture.py +++ /dev/null @@ -1,208 +0,0 @@ - -from dcparser import (as_person, as_date, Field, WorkInfo, DCNS) -from librarian import (RDFNS, ValidationError, NoDublinCore, ParseError, WLURI) -from xml.parsers.expat import ExpatError -from os import path -from StringIO import StringIO -from lxml import etree -from lxml.etree import (XMLSyntaxError, XSLTApplyError, Element) -import re -from functools import * -from operator import * - -class WLPictureURI(WLURI): - _re_wl_uri = re.compile('http://wolnelektury.pl/katalog/obraz/' - '(?P[-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_): - self.dir = dir_ - return super(ImageStore, self).__init__() - - 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 - - @classmethod - def from_string(cls, xml, *args, **kwargs): - return cls.from_file(StringIO(xml), *args, **kwargs) - - @classmethod - def from_file(cls, xmlfile, parse_dublincore=True, image_store=None): - - # first, prepare for parsing - if isinstance(xmlfile, basestring): - file = open(xmlfile, 'rb') - try: - data = file.read() - finally: - file.close() - else: - data = xmlfile.read() - - if not isinstance(data, unicode): - 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(StringIO(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), 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, *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 has_all_props(area, ['x1', 'x2', 'y1', 'y2']) == False: - 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 = {} - 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, unicode): 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