Support superscripts and subscripts. Fixes #157.

src/libprs500/ebooks/lrf/html/convert_from.py

@@ -35,7 +35,7 @@ from libprs500.ebooks.BeautifulSoup import BeautifulSoup, Comment, Tag, \
 from libprs500.ebooks.lrf.pylrs.pylrs import Paragraph, CR, Italic, ImageStream, \
                 TextBlock, ImageBlock, JumpButton, CharButton, \
                 Plot, Image, BlockSpace, RuledLine, BookSetting, Canvas, DropCaps, \
-                LrsError
+                LrsError, Sup, Sub
 from libprs500.ebooks.lrf.pylrs.pylrs import Span as _Span
 from libprs500.ebooks.lrf import Book
 from libprs500.ebooks.lrf import option_parser as lrf_option_parser
@@ -1182,6 +1182,11 @@ class HTMLConverter(object):
             self.current_para = Paragraph()
             self.current_block = self.book.create_text_block(textStyle=pb.textStyle,
                                                              blockStyle=pb.blockStyle)
+        elif tagname in ['sub', 'sup']:
+            text = self.get_text(tag)
+            elem = Sub if tagname == 'sub' else Sup 
+            self.current_para.append(elem(text))
+                    
         elif tagname in ['p', 'div', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
             if tag.has_key('id'):
                 target = self.book.create_text_block(textStyle=self.current_block.textStyle,

src/libprs500/ebooks/lrf/html/demo/demo.html

@@ -104,6 +104,7 @@
  <p>
  A simple <i>paragraph</i> of <b>formatted 
    <i>text</i></b>, with a ruled line following it. 
+   Super<sup>scripts</sup> and Sub<sub>scripts</sub>.
  </p>
  <hr/>
  <p>  A 
@@ -122,7 +123,8 @@
  <hr/>
  <p style='text-indent:30em'>A very indented paragraph</p>
  <p style='text-indent:0em'>An unindented paragraph</p>
- <p>A default indented paragrpah<br /></p>
+ <p>A default indented paragrpah</p>
+ <hr/>
  <p class='toc'>
  <hr />
  <a href='#toc'>Table of Contents</a>