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Old 02-19-2007, 12:44 AM   #1
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Create LRS and LRF files from Python with pylrs

I have just uploaded a Python package that I created called pylrs. It is available from the main page of http://www.falstaffshouse.com.

The package can create both lrs anf lrf files. The lrf files are created directly, without the use of a compiler. An example of creating an lrf file using the package is:

Code:
from pylrs.pylrs import *

b = Book()
b.Page().TextBlock().Paragraph("Hello, World!")
b.renderLrf("hello.lrf")
This will create an lrf file with a single page containing the line "Hello, World!"

There are several example programs included in the distribution that illustrate the various features. I created the package in order to format the plays of Shakespeare, which are also available from the same web page.

The source code is included in the distribution.

The package is optimistically versioned 1.0, but it's never been used by anyone but me, so assume it's an early alpha version at best.

The software has only been tested on Windows XP, Python 2.4 and 2.5, and the PRS-500.

Last edited by Falstaff; 02-19-2007 at 12:49 AM.
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Old 02-19-2007, 01:51 AM   #2
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Atlast! I am really, really happy you did this. Could I ask you to upload the python module to the python package index http://www.python.org/pypi

That will make it easy for other projects to depend on it. If that's too much trouble, I'd be willing to do it for you.

Also can you add some platform detection to set the default encoding. Something like
if 'linux' in sys.platform.lower() or 'darwin' in sys.platform.lower():
default_encoding = 'utf-8'

Thanks and great work.

EDIT: Browsing through the code it doesn't look like you have support for embedded images, or did I miss it?
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Old 02-19-2007, 09:23 AM   #3
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You can have embedded images in an ImageBlock, so they can be cover pages or illustrations. You can't use them by themselves in a Header or on a Canvas yet.

Yes, I forgot the default source encoding was set to the windows character set. Is "utf-8" or "latin-1" a better default for non-Windows 8 bit strings?

For any real projects, you should probably set the encoding explicitly with Book(sourceencoding="<codec>"). See the russanbook.py example program for an example of this.

The code can be uploaded anywhere -- there are no restictions on it's use. But I only plan to maintain the latest version on the web page.

Last edited by Falstaff; 02-19-2007 at 10:13 AM.
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Old 02-19-2007, 12:32 PM   #4
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On most modern Linux systems, utf-8 is a good choice for default encoding. Not so sure about OSX.
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Old 03-15-2007, 02:49 AM   #5
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Quote:
Originally Posted by kovidgoyal
On most modern Linux systems, utf-8 is a good choice for default encoding. Not so sure about OSX.
Firstly, the standard forum newbie "hi all".

Yeah, OSX has it's own ver of UTF 8 ( known as UTF 8 MAC) and can cause headaches ( i.e. samba for one ).

And thanks for the python scripts, my readers should hopefully be here tomorrow, as an OS X user it looks as if I'm in for a bit of fun.
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Old 03-23-2007, 10:59 AM   #6
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Jiha!

Hi Mike,

I've played arround with your scripts, and I am really, really happy about them.
The only problem is, that I dont know Python at all But hey - it cant be that difficult

Uwe, tryin' to build a HTML2LRF-script the very moment.
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Old 03-27-2007, 08:25 PM   #7
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Sorry, I was out of town and didn't see your message. I think it would be fairly hard to use these scripts without knowing python pretty well, but if you have any specific questions, let me know and I'll try to answer them.
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Old 03-31-2007, 07:42 PM   #8
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Falstaff: I made some changes in your code, in file pylrs.py:587
Code:
if not isinstance(textBlock, TextBlock) and not isinstance(textBlock, ImageBlock):
I needed support for referring to ImageBlocks from a TOC for my PDFRead project.

Thanks for the very wonderful library!
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Old 04-01-2007, 07:32 PM   #9
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Thanks for the fix -- I'll incorporate it in the next version. I'm glad the code is of use to people.
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Old 04-06-2007, 04:33 PM   #10
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Falstaff.

Would you mind providing the code for the conversion project you did?

The samples are handy, but a more complete example (one that opens files, for example) would be great for a Python newb like myself.

-Pie
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Old 04-19-2007, 01:21 AM   #11
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BUMP.

Still hoping for sample code that reads a file for conversion!

-Pie
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Old 04-19-2007, 08:35 AM   #12
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Quote:
Originally Posted by EatingPie
Still hoping for sample code that reads a file for conversion!-Pie
Don't know if it will help you, but you can look at the code for generating LRF files for PDFRead (look at the LrfOutput class, line 182).
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Old 04-22-2007, 01:48 AM   #13
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@Falstaff

It may be a good idea to change the default blockStyle for an ImageBlock to
BlockStyle(blockrule='block-fixed') that way the reader doesn't scale images off the page when going from S->M->L
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Old 04-23-2007, 02:48 PM   #14
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Quote:
Originally Posted by ashkulz
Don't know if it will help you, but you can look at the code for generating LRF files for PDFRead (look at the LrfOutput class, line 182).
Thanks for the pointers, I'll give it a go.

Now another questions...

I have code to generate UTF-16 smart quotes, which I would want to embed into pylrs. I noted that just pre-pending a "u" to a string flags it as UTF-16, from the (super ultra crappy) Python reference I used. Problem is, this foregoes any algorithmic conversion. EG...

text = u"This is text";

But I need to scan the text and look for preceding and following characters to decide which curly-quote to apply (open or close). Once a string has the "u" prepended, I have no idea what I'm dealing with.

My lack of python knowledge really shows here. So let me break this down into two basic questions.

(1) Where would I parse text and convert it to UTF-16?

(2) Is there a GOOD Python reference on the Internet? The one I used was the Python Library Reference, is literally the worse documentation I've seen, ever! (http://docs.python.org/lib/lib.html).

I really prefer makelrf3, but I have several bugs (and lack of features) that makes pylrs look far more viable... if I can just figure out how to parse a string to apply my curly-quotes algorithm.

-Pie
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Old 04-23-2007, 04:23 PM   #15
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pydoc codecs.decode
pydoc codecs.encode

and u'my string' is a python unicode object not a utf-16 encoded string.
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