Re: simplified Python parsing question

On Sun, 29 Jul 2012 19:21:49 -0400, Eric S. Johansson wrote:

> When you are sitting on or in a name, you look to the left or look to
> the right what would you see that would tell you that you have gone past
> the end of that name. For example

Have you read the docs? It gives full details of the Python syntax.

http://docs.python.org/reference/index.html

For example:

http://docs.python.org/reference/sim...ent-statements

See also:

http://docs.python.org/library/language.html
http://effbot.org/zone/simple-top-down-parsing.htm
http://nedbatchelder.com/text/python-parsers.html


Here's a Python parser using the pyparsing library. It's a bit old
(written for Python 2.4) but it shouldn't be hard to update it to new
syntax:

http://pyparsing.wikispaces.com/file...ammarParser.py



--
Steven

On 7/29/2012 11:33 PM, Steven D'Aprano wrote:
> On Sun, 29 Jul 2012 19:21:49 -0400, Eric S. Johansson wrote:
>
>> When you are sitting on or in a name, you look to the left or look to
>> the right what would you see that would tell you that you have gone past
>> the end of that name. For example
> Have you read the docs? It gives full details of the Python syntax.

Yes I have. I was hoping for a different perspective because what I'm trying to
do is middle out parsing. Top-down when the scanner focus moves from left to
right and bottom up when the scanner focus moves from right to left.

sounds kind of odd when I describe it that way but both the cursor is on the
middle of a name string and I need to look to either end of that name string
before can do a conversion to a symbol string, I have to look at both ends in
different ways. If you've read the documentation I've provided, would it be a
better example to use for describing some of the issues. Here's a very rough
draft of a storyboard

https://docs.google.com/presentation...vm40wzCo8/edit

the first 13-14 slides are the working content for the storyboard. the rest is
mostly "memory" of things I was thinking about so if it doesn't make sense or
seems wrong, don't give me grief. :-)

> Here's a Python parser using the pyparsing library. It's a bit old
> (written for Python 2.4) but it shouldn't be hard to update it to new
> syntax:
>
> http://pyparsing.wikispaces.com/file...ammarParser.py
>

thanks for the reference. I'll take a look at it as well.