private void Hold(SymbolToken val)
{
_heldInput.Add(val);
if (val.Type == SymbolType.OpenBracket)
{
_parentheses++;
}
if (val.Type == SymbolType.CloseBracket)
{
_parentheses--;
}
if (_parentheses == 0)
{
// remove parentheses
var tv = new TokenValidater(_heldInput.GetRange(1, _heldInput.Count - 2));
// add back in original parentheses
Output(_heldInput[0]);
Output(tv.PumpAll());
Output(_heldInput[_heldInput.Count - 1]);
_heldInput = new List <SymbolToken>();
_holdInput = false;
}
}
public static List <SymbolToken> Parse(string expression, VariableContext context)
{
var pipe1 = new StringToPrimitiveTokenPipe(expression, context);
var pipe2 = new MatchAllParenthesesProcessor(pipe1);
var pipe3 = new NegationProcessor(pipe2);
var pipe4 = new RedundantParenthesesProcessor(pipe3);
var pipe5 = new TokenValidater(pipe4);
return(pipe5.PumpAll());
}