-# -*- 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, *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