1# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
2# Copyright (c) 2009 The Hewlett-Packard Development Company
3# All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions are
7# met: redistributions of source code must retain the above copyright
8# notice, this list of conditions and the following disclaimer;
9# redistributions in binary form must reproduce the above copyright
10# notice, this list of conditions and the following disclaimer in the
11# documentation and/or other materials provided with the distribution;
12# neither the name of the copyright holders nor the names of its
13# contributors may be used to endorse or promote products derived from
14# this software without specific prior written permission.
15#
16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28from slicc.symbols.Symbol import Symbol
29from slicc.symbols.State import WildcardState
30
31class Transition(Symbol):
32    def __init__(self, table, machine, state, event, nextState, actions,
33                 request_types, location):
34        ident = "%s|%s" % (state, event)
35        super(Transition, self).__init__(table, ident, location)
36
37        self.state = machine.states[state]
38        self.event = machine.events[event]
39        if nextState == '*':
40            # check to make sure there is a getNextState function declared
41            found = False
42            for func in machine.functions:
43                if func.c_ident == 'getNextState_Addr':
44                    found = True
45                    break
46            if not found:
47                fatal("Machine uses a wildcard transition without getNextState defined")
48            self.nextState = WildcardState(machine.symtab,
49                                           '*', location)
50        else:
51            self.nextState = machine.states[nextState]
52        self.actions = [ machine.actions[a] for a in actions ]
53        self.request_types = [ machine.request_types[s] for s in request_types ]
54        self.resources = {}
55
56        for action in self.actions:
57            for var,value in action.resources.iteritems():
58                num = int(value)
59                if var in self.resources:
60                    num += int(value)
61                self.resources[var] = str(num)
62
63    def __repr__(self):
64      return "[Transition: (%r, %r) -> %r, %r]" % \
65             (self.state, self.event, self.nextState, self.actions)
66
67    def getActionShorthands(self):
68        assert self.actions
69
70        return ''.join(a.short for a in self.actions)
71
72__all__ = [ "Transition" ]
73