How to write regexp for getting one specific function parameters

Question

I'm trying to write an python script to collect one specific function's parameters. Parameters can be in multiple lines like this:

str = "getParameters(['ABCD_1','ABCD_2',\
                       'ABCD_3','ABCD_4'])\

This works already: (it can catch every words between ' and '):

parameters = re.findall(r'\'[\w-]+\'', str)
for parameter in parameters:
   print parameter

But I want that only in case of getParameters function the parameters to be collect, and this does not work:

getparameters = re.findall(r'getParameters\(\[[\w-]+', str, re.X|re.DOTALL)
for line in getparameters:
    print line

Please suggest!

Just to be completely clear: this is the function parameters of code written in Python using Python? — Richard
– Richard, Commented Jan 15, 2013 at 10:18
Yes, actually I want to process python code with python regexp. — Balee13
– Balee13, Commented Jan 15, 2013 at 10:31

Lennart Regebro · Accepted Answer · 2013-01-15 10:41:43Z

2

Here is an example using ast, just for fun.

import ast

module = ast.parse(
    """getParameters(['ABCD_1','ABCD_2',
                      'ABCD_3','ABCD_4'])""")

for item in module.body:
    if isinstance(item.value, ast.Call) and item.value.func.id == 'getParameters':
        parameters = [each.s for each in item.value.args[0].elts]

print parameters

answered Jan 15, 2013 at 10:41

Lennart Regebro

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3 Comments

Balee13 Over a year ago

Hi, thanks I would like to try but: NameError: name 'ast' is not defined

Balee13 Over a year ago

Hi,Could you please help me in using this AST?

Lennart Regebro Over a year ago

@Balee13: You forgot the first line.

woemler · Accepted Answer · 2013-01-15 14:59:27Z

0

If you're fixed on using RegEx and if your function occurs exactly once, you can try:

re.findall('\'(\w+)\',?', re.search('(getParameters\(.+?\))', x, re.X|re.S).group(1), re.X|re.S)

It's not ideal, but it works. I am sure there is a better way to do this.

answered Jan 15, 2013 at 14:59

woemler

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