# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
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from slicc.ast.DeclAST import DeclAST
from slicc.symbols import Transition

class TransitionDeclAST(DeclAST):
    def __init__(self, slicc, request_types, states, events, next_state,
                 actions):
        super().__init__(slicc)

        self.request_types = request_types
        self.states = states
        self.events = events
        self.next_state = next_state
        self.actions = actions

    def __repr__(self):
        return "[TransitionDecl: ]"

    def generate(self):
        machine = self.symtab.state_machine

        if machine is None:
            self.error("Transition declaration not part of a machine.")

        for action in self.actions:
            if action not in machine.actions:
                self.error("Invalid action: %s is not part of machine: %s" % \
                           (action, machine))

        for request_type in self.request_types:
            if request_type not in machine.request_types:
                self.error("Invalid protocol access type: " \
                           "%s is not part of machine: %s" % \
                           (request_type, machine))

        for state in self.states:
            if state not in machine.states:
                self.error("Invalid state: %s is not part of machine: %s" % \
                           (state, machine))
            next_state = self.next_state or state
            for event in self.events:
                if event not in machine.events:
                    self.error("Invalid event: %s is not part of machine: %s" % \
                               (event, machine))
                t = Transition(self.symtab, machine, state, event, next_state,
                               self.actions, self.request_types, self.location)
                machine.addTransition(t)