chatops_parser.py

import re


def parse(template, string):

    result = {}

    # getting a full list of params with their default values if present
    params_list = re.findall(r'{{\s*(.+?)\s*(?:=(.+?))?\s*}}', template)

    # compiling a regexp: it's almost fully copied from hubot-stackstorm,
    # but note the named grouping
    reg = re.sub(r'\s+{{\s*(\w+)\s*=.+?\s*}}', r'(?:\s+(?P<\1>.+?))?', template)
    reg = re.sub(r'{{\s*(.+?)\s*}}', r'(?P<\1>.+?)', reg)
    reg = reg + r'(\s+)?(\s?(\w+)=(\w+)){0,}$'

    print reg

    match = re.match(reg, string)
    if match:

        values_dict = match.groupdict()
        # iterating through a list of params and substituting with default
        # values if something's not present
        for param in params_list:
            result[param[0]] = values_dict[param[0]] or param[1]

    return result

print parse("chatopsaction {{ string }}", "chatopsaction word1")
# {'string': 'word1'}

print parse("chatopsaction {{ string }}", "chatopsaction word1 word2")
# {'string': 'word1 word2'}

print parse("chatopsaction {{ string }} {{ string2=default }}", "chatopsaction word1 word2")
# {'string2': 'word2', 'string': 'word1'}

print parse("chatopsaction {{ string }} {{ string2=default }}", "chatopsaction word1")
# {'string2': 'default', 'string': 'word1'}

print parse("chatopsaction {{ string }} {{ string2=default }} {{ string3=default }}", "chatopsaction word1")
# {'string2': 'default', 'string': 'word1', 'string3': 'default'}

print parse("chatopsaction {{ string }} {{ string2 }} {{ string3=default }}", "chatopsaction word1 word2 word3")
# {'string2': 'word2', 'string': 'word1', 'string3': 'word3'}

print parse("chatopsaction {{ string }} {{ string2 }}", "chatopsaction word1 word2 word3")
# {'string2': 'word2 word3', 'string': 'word1'}