public StateMachine CreateMachine()
{
Log(LogEventLevel.Information, "Configuring the state machine");
var machine = new StateMachine(LexerState.Initial);
machine.OnUnhandledTrigger((state, symbol) => ReturnToken(CurrentToken, symbol));
machine.OnTransition(transition =>
{
Log(LogEventLevel.Information, "Transition: {0} -> ({1}) -> {2}", true, transition.Source,
Regex.Escape(transition.Trigger.ToString()), transition.Destination);
CurrentToken.Append((char)transition.Trigger.Value);
});
machine.Configure(LexerState.Initial)
.Permit(Symbol.Letter, LexerState.String)
.Permit(Symbol.Digit, LexerState.Number)
.Permit(Symbol.Operator, LexerState.Operator)
.Permit(Symbol.Point, LexerState.Point)
.Permit(Symbol.Less, LexerState.LessOperator)
.Permit(Symbol.Greater, LexerState.GreaterOperator)
.Permit(Symbol.Equal, LexerState.AssignmentOperator)
.Permit(Symbol.Exclamation, LexerState.Not)
.Permit(Symbol.Splitter, LexerState.Splitter)
.Permit(Symbol.Comma, LexerState.Comma)
.Permit(Symbol.Hypen, LexerState.Hypen)
.Permit(Symbol.Colon, LexerState.Colon)
.Ignore(Symbol.Space)
.OnUnhandled(Error);
machine.Configure(LexerState.String)
.PermitReentry(Symbol.Letter)
.PermitReentry(Symbol.Digit)
.OnUnhandled(ReturnIdOrTokenOrLabel);
machine.Configure(LexerState.Number)
.PermitReentry(Symbol.Digit)
.Permit(Symbol.Point, LexerState.NumberWithPoint)
.OnUnhandled(ReturnConst);
machine.Configure(LexerState.NumberWithPoint)
.PermitReentry(Symbol.Digit)
.OnUnhandled(ReturnConst);
machine.Configure(LexerState.Point)
.Permit(Symbol.Digit, LexerState.NumberWithPoint)
.OnUnhandled(Error);
machine.Configure(LexerState.LessOperator)
.Permit(Symbol.Equal, LexerState.LessEqual);
machine.Configure(LexerState.GreaterOperator)
.Permit(Symbol.Equal, LexerState.GreaterEqual);
machine.Configure(LexerState.AssignmentOperator)
.Permit(Symbol.Equal, LexerState.EqualOperator);
machine.Configure(LexerState.Not)
.Permit(Symbol.Equal, LexerState.NotEqual);
machine.Configure(LexerState.Splitter)
.PermitReentry(Symbol.Splitter);
return(machine);
}
