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path: root/tools/dfagen/dfagen/automaton.py
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class Event:
    """Event definition."""

    def __init__ (self, name, comments = ''):
        self.name = name
        self.comments = comments
        pass

    def __str__ (self):
        s = ' ' + self.name + '\n'
        if self.comments:
            s += '  ' + self.comments.replace ('\n', '\n  ') + '\n'
        return s

class State:
    """State definition."""

    def __init__ (self, name, comments = ''):
        self.name = name
        self.comments = comments
        self.transitions = { }

    def __str__ (self):
        s = ' ' + self.name + '\n'
        if self.comments:
            s += '  ' + self.comments.replace ('\n', '\n  ') + '\n'
        return s

    def add_branch (self, branch):
        if branch.event not in self.transitions:
            self.transitions[branch.event] = Transition (branch.event)
        self.transitions[branch.event].add_branch (branch)

class Transition:
    """Transition definition."""

    def __init__ (self, event):
        self.event = event
        self.branches = { }

    def add_branch (self, branch):
        assert self.event is branch.event
        if branch.name == None and self.branches:
            raise KeyError (branch.name)
        if branch.name != None and None in self.branches:
            raise KeyError (branch.name)
        if branch.name in self.branches:
            raise KeyError (branch.name)
        self.branches[branch.name] = branch

    def __str__ (self):
        s = ''
        for br in self.branches.values ():
            s += str (br);
        return s

class TransitionBranch:

    def __init__ (self, event, name = None, to = None, comments = ''):
        self.event = event
        self.name = name
        self.to = to
        self.comments = comments

    def __str__ (self):
        s = ' ' + self.event.name
        if self.name:
            s += ': ' + self.name
        s += ' -> ' + (self.to and self.to.name or '.') + '\n'
        if self.comments:
            s += '  ' + self.comments.replace ('\n', '\n  ') + '\n'
        return s

class Automaton:
    
    def __init__ (self, name):
        self.name = name
        self.comments = ''
        self.initial = None
        self.states = { }
        self.events = { }

    def add_state (self, state):
        if state.name in self.states:
            raise KeyError (state.name)
        if not self.states:
            self.initial = state
        self.states[state.name] = state

    def add_event (self, event):
        if event.name in self.events:
            raise KeyError (event.name)
        self.events[event.name] = event

    def __str__ (self):
        s = self.name
        if self.comments:
            s += '  ' + self.comments.replace ('\n', '\n  ') + '\n'
        s += '\nStates:\n'
        for state in self.states.values ():
            s += str (state)
        s += '\nEvents:\n'
        for event in self.events.values ():
            s += str (event)
        s += '\n'
        for state in self.states.values ():
            s += state.name + ':\n'
            for tr in state.transitions.values ():
                s += str (tr)
            s += '\n'
        return s