On Aug 6, 9:38 am, Bill <[EMAIL PROTECTED]> wrote:
> Is there anyway I can extend python to accept a command
> which looks more like shell syntax than a function call.
>
> I want to be able to do this:
>
> if blah :
> MyCommand Arg1 Arg2
>
> as opposed to this:
>
> if blah :
> MyCommand(Arg1,Arg2)
>
> or this:
>
> if blah :
> x("MyCommand Arg1 Arg2")
>
> Of source, I would like to do this by writing a module (or through
> some other run-time hook) as opposed to editing the Python source
> code.
>
> Thanks in advance
> (unless you are just a Python nut who is flaming to tell me that I
> should not want this. :-) )
>
> Bill
Bill,
You'll need to decide on a grammar you want to use beforehand. What
do you do with:
>>> if f 0 and g
?
Does it translate to:
if f( 0 ) and g( )
or
if f( 0 and g )
? If every line starts with its one and only function, and the
parameters exhaust the rest of the line, and you don't allow nested
expressions, you can run a preprocessor, then call Python. (Those
three conditions are limiting.) Here's the steps for each line.
1. strip leading tabs
2. compile( line, '<none>', 'exec' ) to check for SyntaxError
3. if found:
3a. replace first space with '('
3b. replace remaining space with ','
3c. add trailing ')'
3d. replace leading tabs
Then just run:
python preprocessor.py -filename-
python -filename-.pppy
Have a look at code.py and codeop.py as well and the
InteractiveInterpreter class.
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