svg mathematical equation

Ok, it's done: mathematical equations generated dynamically and displayed as svg graphics. Only using the standard Python library ... and one "tiny" additional download: matplotlib. Here's the first result (saved as a "hard-copy"; you may have to download the page and reopen it locally using Firefox.)

Note: do not bother looking for the files in the "py-fun" repository where I had the first release of docpicture. I will clean up things a bit and do a new release from a different place.

As usual, comments & suggestions are welcome.

docpicture and uml sequence diagrams

In a previous post about docpicture, I gave an example of a graphics generated from this site as something that would be desirable to do. (You can find more examples here.) Well, it turned out to be easy to do ... at the cost of a server connection. I used the example given to embed a graphics inside a page and ... voilà, it is done. As long as one has a live internet connection (and assuming the websequencediagram server is not down), a graphics is generated as requested.

Eventually, I still would like to implement my own parser to create svg code for uml sequence diagrams rather than relying on an external service.

docpicture: initial release

The subject line says it all. It's a small download: less than 22 kB, available from here. Feedback and suggestions are definitely welcome.

docpicture: working ... and a query.

docpicture (see previous posts) is now working as a full prototype. By this, I mean that instead of doing

>>> help(some_object)

at the Python prompt, one can do

>>> from docpicture import view
>>> view(some_object)

and some_object's docstring will be displayed in your webbrowser, with any docpicture directive being translated so as to embed a nice picture. Well, by "any", I mean any turtle directive conforming to the limited syntax I have included.

When I compare the output of help() with that of docpicture.view(), I am struck at how much more information than simply the object's docstring is included. I have tried (briefly) to play with the pydoc module to see if I could redirect the output of help() to a string that I could process with docpicture.view() ... but to no avail.

If anyone knows how I could do this simply, I would be very grateful.

docpicture is going to be released (version 0.1) as soon as I complete a decent "readme" file.

--UPDATE-- Ok, after playing some more with pydoc, I found out how to do this.

In my module, I do the following:

import pydoc
from StringIO import StringIO
my_stdin = StringIO()
def my_pager(text):
   my_stdin.write(pydoc.plain(text))
   return
pydoc.pager = my_pager

pydoc.help(obj)
retrieved = my_stdin.getvalue()
my_stdin.close()

and use the retrieved text as I wish.

docpicture: getting closer

This is just a progress report for the curious among you: the previous two images were generated automatically from the docpicture code written above them. If everything goes well, by the end of the weekend I'll be ready to give a sneak preview of the code to anyone interested. Feel free to contact me.

docpicture + svg generation: first prototype working

As outlined in a previous post, I have decided to use svg to embed pictures in html pages generated from docstrings. Of course, this could be generalized to other cases than docstrings; for example, this could be implemented as a reStructuredText directive. In the course of playing with generating such pages with inline svg code, I observed the following:

1. If a file is saved locally and loaded within Firefox, it should be saved with a ".xml" (or possibly ".xhtml") extension.
2. If a file is served dynamically from a server, all that is needed is that its content be identified as "application/xhtml+xml" [as I had mentioned previously].
3. If the file is put on a "generic webserver" that can't be configured by the user, Firefox will ignore the svg code if the extension of the file is ".xml" or ".html". However, I did find a workaround: use a ".xhtml" extension and, when prompted by Firefox as to what application to use to open such file, select Firefox itself. The file will be downloaded locally and displayed correctly. At least, this is what happens on a Mac with Firefox 3.

There might be another way to do this; if so, I would be interested in knowing how. In the meantime, for those interested, here is the output of a first working test case.

Update: The test case has been improved with styling.

Update 2: A new picture perhaps gives a better idea of a more realistic use case.

Seeking advice on parsing

Dear Lazyweb,

As a follow-up to my previous post, I have a question...

Suppose you wanted to design an application that used parsing as a core element and you wanted this application to be easily extended by users. Furthermore, you were hoping that the users would contribute back some parsers that could be included in future versions. Would you:

1a) Use pyparsing and require all potential users of your application to download it separately.
1b) Use pyparsing but include it bundled with your application.
2) Use regular expressions (re module in standard library) and expect everyone to do the same.
3) Use some other module in the standard library.
4) Use some other 3rd party parsing package.