Epub: only attach images referenced in the text.

[librarian.git] / librarian / picture.py

diff --git a/librarian/picture.py b/librarian/picture.py
index 6fc40b1..10d2ae7 100644 (file)
--- a/librarian/picture.py
+++ b/librarian/picture.py
@@ -1,24 +1,27 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
 
-from dcparser import (as_person, as_date, Field, WorkInfo, DCNS)
+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 StringIO import StringIO
 from lxml import etree
 from lxml.etree import (XMLSyntaxError, XSLTApplyError, Element)
 import re
-from functools import *
-from operator import *
+import six
+
 
 class WLPictureURI(WLURI):
-    _re_wl_uri = re.compile('http://wolnelektury.pl/katalog/obraz/'
-            '(?P<slug>[-a-z0-9]+)/?$')
+    _re_wl_uri = re.compile('http://wolnelektury.pl/katalog/obraz/(?P<slug>[-a-z0-9]+)/?$')
 
     @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)
 
@@ -39,15 +42,14 @@ class PictureInfo(WorkInfo):
         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),
-        )
+        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']
+           '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',
@@ -55,8 +57,8 @@ class ImageStore(object):
             'application/x-shockwave-flash', 'image/iff', 'image/vnd.wap.wbmp', 'image/xbm']
 
     def __init__(self, dir_):
+        super(ImageStore, self).__init__()
         self.dir = dir_
-        return super(ImageStore, self).__init__()
 
     def path(self, slug, mime_type):
         """
@@ -96,16 +98,17 @@ class WLPicture(object):
             self.picture_info = PictureInfo.from_element(self.rdf_elem)
         else:
             self.picture_info = None
+        self.frame = None
 
     @classmethod
-    def from_string(cls, xml, *args, **kwargs):
-        return cls.from_file(StringIO(xml), *args, **kwargs)
+    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, basestring):
+        if isinstance(xmlfile, six.text_type):
             file = open(xmlfile, 'rb')
             try:
                 data = file.read()
@@ -114,7 +117,7 @@ class WLPicture(object):
         else:
             data = xmlfile.read()
 
-        if not isinstance(data, unicode):
+        if not isinstance(data, six.text_type):
             data = data.decode('utf-8')
 
         data = data.replace(u'\ufeff', '')
@@ -125,12 +128,12 @@ class WLPicture(object):
 
         try:
             parser = etree.XMLParser(remove_blank_text=False)
-            tree = etree.parse(StringIO(data.encode('utf-8')), parser)
+            tree = etree.parse(six.BytesIO(data.encode('utf-8')), parser)
 
-            me =  cls(tree, parse_dublincore=parse_dublincore, image_store=image_store)
+            me = cls(tree, parse_dublincore=parse_dublincore, image_store=image_store)
             me.load_frame_info()
             return me
-        except (ExpatError, XMLSyntaxError, XSLTApplyError), e:
+        except (ExpatError, XMLSyntaxError, XSLTApplyError) as e:
             raise ParseError(e)
 
     @property
@@ -151,7 +154,7 @@ class WLPicture(object):
         return self.image_store.path(self.slug, self.mime_type)
 
     def image_file(self, *args, **kwargs):
-        return open(self.image_path, *args, **kwargs)
+        return open(self.image_path, 'rb', *args, **kwargs)
 
     def get_sem_coords(self, sem):
         area = sem.find("div[@type='rect']")
@@ -162,29 +165,31 @@ class WLPicture(object):
         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:
+        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 = {}
-            pd['type'] = part.get('type')
+        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
+            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
+                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