[Tutor] shlex parsing

[Steven D'Aprano]

Karim wrote:
> 
> Hello All,
> 
> I would like to parse this TCL command line with shlex:
> 
> '-option1 [get_rule A1 B2] -option2 $VAR -option3 TAG'
> 
> And I want to get the splitted list:
> 
> ['-option1', '[get_rule A1 B2]', '-option2',  '$VAR', '-option3',  'TAG']
> 
> Then I will gather in tuple 2 by 2 the arguments.
> 
> I tried to the shlec properties attributes 'quotes', 'whitespace', etc...

I don't understand what you are doing here. Please show the code you use.

The shlex module doesn't support bracketed expressions. I recommend you 
write a post-processor. Start with doing this:

 >>> import shlex
 >>> text = '-option1 [get_rule A1 B2] -option2 $VAR -option3 TAG'
 >>> shlex.split(text)
['-option1', '[get_rule', 'A1', 'B2]', '-option2', '$VAR', '-option3', 
'TAG']

then take that list and reassemble the pieces starting with '[' until 
']' Something like this, untested:


def reassemble(items):
     result = []
     bracketed = False
     current = ''
     for item in items:
         if item.startswith('['):
             bracketed = True
         if bracketed:
             current += item
             if item.endswith(']'):
                 bracketed = False
                 result.append(current)
                 current = ''
         else:
              result.append(item)
     return result



> But I make 'choux blanc'.

I don't know what that means.




-- 
Steven