public static InterpreterState StartFromInitialState(ILexemesStack stack)
{
var openingBracket = new OpeningBracket(SymbolFactory.CreateSymbol('(', -1));
stack.Push(openingBracket);
return(new OpeningBracketOperatorState());
}
public double?Execute(string expression)
{
var state = InterpreterState.StartFromInitialState(_stack);
for (var index = 0; index < expression.Length; index++)
{
var symbol = SymbolFactory.CreateSymbol(expression, index);
state = state.MoveToNextState(symbol, _stack, _context);
state.Execute(_stack, _context);
}
state = state.MoveToFinalState(expression.Length, _stack, _context);
state.Execute(_stack, _context);
return(_stack.GetResult(_context));
}
public InterpreterState MoveToFinalState(int lastSymbolIndex, ILexemesStack stack, ExecutorContext context)
{
var lastSymbol = SymbolFactory.CreateSymbol(')', lastSymbolIndex);
return(MoveToNextState(lastSymbol, stack, context));
}
