def _init(self):
f = FSM(0)
f.arg = ""
f.add_default_transition(self._error, 0)
# normally add text to args
f.add_transition(ANY, 0, self._addtext, 0)
f.add_transition_list(" \t", 0, self._wordbreak, 0)
f.add_transition_list(";\n", 0, self._doit, 0)
# slashes
f.add_transition("\\", 0, None, 1)
f.add_transition("\\", 3, None, 6)
f.add_transition(ANY, 1, self._slashescape, 0)
f.add_transition(ANY, 6, self._slashescape, 3)
# vars
f.add_transition("$", 0, self._startvar, 7)
f.add_transition("{", 7, self._vartext, 9)
f.add_transition_list(self.VARNAME, 7, self._vartext, 7)
f.add_transition(ANY, 7, self._endvar, 0)
f.add_transition("}", 9, self._endvar, 0)
f.add_transition(ANY, 9, self._vartext, 9)
# vars in singlequote
f.add_transition("$", 3, self._startvar, 8)
f.add_transition("{", 8, self._vartext, 10)
f.add_transition_list(self.VARNAME, 8, self._vartext, 8)
f.add_transition(ANY, 8, self._endvar, 3)
f.add_transition("}", 10, self._endvar, 3)
f.add_transition(ANY, 10, self._vartext, 10)
# single quotes quote all
f.add_transition("'", 0, None, 2)
f.add_transition("'", 2, self._singlequote, 0)
f.add_transition(ANY, 2, self._addtext, 2)
# double quotes allow embedding word breaks and such
f.add_transition('"', 0, None, 3)
f.add_transition('"', 3, self._doublequote, 0)
f.add_transition(ANY, 3, self._addtext, 3)
# single-quotes withing double quotes
f.add_transition("'", 3, None, 5)
f.add_transition("'", 5, self._singlequote, 3)
f.add_transition(ANY, 5, self._addtext, 5)
self._fsm = f
