CocoMUD client

# Copyright (c) 2016, LE GOFF Vincent

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"""Class containing the Trigger class."""

import re

class Trigger:

    """A trigger object.

    In a MUD client terminology, a trigger can "watch" the information

    received by the client, and do something in return, like sending

    an information to the server, playing a sound, calling a script

    and so on.

    """

    def __init__(self, sharp, reaction, action):

        self.sharp_engine = sharp

        self.reaction = reaction

        self.re_reaction = self.find_regex(reaction)

        self.action = action

    def __repr__(self):

        return "<Trigger for {}>".format(repr(self.reaction))

    def find_regex(self, reaction):

        """Find and compile the reaction given as argument.

        If the reaction begins with '^', the reaction is already a

        regular expression that just needs to be compiled.  Otherwise,

        some automatic actions will be performed on it.

        """

        if reaction.startswith("^"):

            return re.compile(reaction)

        reaction = re.escape(reaction)

        # The '*' sign will be replaced by a group

        reaction = reaction.replace("\\*", "(.*?)")

        reaction = "^" + reaction + "$"

        print "test", reaction

        return re.compile(reaction, re.IGNORECASE)

    def feed(self, line):

        """Should the trigger be triggered by the text?"""

        if self.re_reaction.search(line):

            self.execute()

    def execute(self):

        """Execute the trigger."""

        print "execute the trigger", self

        self.sharp_engine.execute(self.action)