import re
import pprint

class Matcher(object):
    def __init__(self):
        self.s = ""

    def match(self, pattern):
        s = self.s.lower()

        alts = lambda seq: "(%s)" % "|".join(seq)
        def alts2(groupName, seq):
            return "(?P<%s>%s)" % (groupName, "|".join(seq))

        LIST_OF_NAMES = [
            "john",
            "alice",
            "bob",
            ]
        LIST_OF_OBJECTS = [ "light", "tv", "oven"]
        ON_VERBS = ["turn on", "activate"]
        OFF_VERBS = ["turn off", "deactivate"]
        ROOMS = ["living room", "bed room"]

        pattern = pattern.replace("$object", alts2("object", LIST_OF_OBJECTS))
        pattern = pattern.replace("$activate", alts2("activate", ON_VERBS))
        pattern = pattern.replace("$deactivate", alts2("deactivate", OFF_VERBS))

        self._match_context = None

        def f(m):
            self._match_context = m.group(1)
            #print "got m, m.group: '%s'" % m.group()
            #print "got m, m.group(0): '%s'" % m.group(0)
            #print "got m, m.group(1): '%s'" % m.group(1)
            #print "got m, m.group(2): '%s'" % m.group(2)
            return "$" + m.group(2)

        #print "pattern befor:", pattern
        pattern = re.sub("\$(\w+):(\w*)", f, pattern)
        #print "pattern after:", pattern

        pattern = pattern.replace("$location", alts2("location", ROOMS))
        pattern = pattern.replace("$name", alts2("name", LIST_OF_NAMES))

        print "pattern: %s, s: %s" % (pattern, s)
        self.m = re.match(pattern, s)
        if self.m:
            print "%s ->" % s
            gd = self.m.groupdict()
            if self._match_context:
                gd["context"] = self._match_context
            pprint.pprint(gd)
            print
            return gd
        else:
            return False

    def parse(self, s):
        self.s = s.lower()
        #self.match("call $name")
        self.match("call $call:name")
        self.match("$activate $object")
        #self.match("$deactivate $object")
        self.match("$activate $object in $near:location")

def main():
    m = Matcher()
    m.parse("Call John")
    print "-"*20
    m.parse("turn on tv")
    #print "-"*20
    #m.parse("turn off tv")
    print "-"*20
    m.parse("turn on tv in living room")
    #print "-"*20

if __name__ == "__main__":
    main()