/// <summary>
/// Builds a sum or suntract command and adds it to current scope.
/// Type and operands are gotten from symbol stack.
/// Result is pushed to the symbol stack.
/// </summary>
private void DoPendingSum()
{
var op2 = _symbolStack.Pop();
var op1 = _symbolStack.Pop();
var oper = _operatorStack.Pop();
Type type;
if (CheckTypeMismatch(op1, op2, oper, out type))
{
// Add new symbol to scope
var result = _varBuilder.NewVariable(type);
_currentScope.Add(result);
Command cmd = null;
switch (oper)
{
case Operator.Sum:
cmd = new Sum {
Op1 = op1, Op2 = op2, Result = result
};
break;
case Operator.Minus:
cmd = new Subtract {
Op1 = op1, Op2 = op2, Result = result
};
break;
}
// Add to symbol stack and add command to scope's commands.
_symbolStack.Push(result);
_currentScope.CommandList.Commands.Add(cmd);
}
}
/// <summary>
/// Creates necessary commands to make a value negative.
/// </summary>
private void DoNegative()
{
var value = _symbolStack.Pop();
if (value.Type != Type.Entero && value.Type != Type.Decimal)
{
SemErr("Esta variable no puede ser negativa.");
}
var zero = _constBuilder.IntConstant("0");
var result = _varBuilder.NewVariable(value.Type);
var cmd = new Subtract
{
Op1 = zero,
Op2 = value,
Result = result
};
_currentScope.CommandList.Commands.Add(cmd);
_symbolStack.Push(result);
}
