/// <summary>
/// Implements the operators.
/// </summary>
private void ImplementOperators()
{
while (true)
{
int bestPriority = int.MinValue;
int bestIndex = -1;
StatementOperator best = null;
for (int i = 0; i < this.Statements.Count; i++)
{
var s = this.Statements[i];
if (!(s is StatementOperator))
{
continue;
}
var ops = (StatementOperator)s;
int p = ops.Priority;
if (p > bestPriority)
{
bestPriority = p;
bestIndex = i;
best = ops;
}
}
if (best == null)
{
break;
}
if (bestIndex == 0 || bestIndex == this.Statements.Count - 1)
{
throw new FormatException("Found operator without an operand!");
}
Statement operand1 = this.Statements[bestIndex - 1];
Statement operand2 = this.Statements[bestIndex + 1];
this.Statements.RemoveRange(bestIndex - 1, 3);
var impl = new StatementOperatorImpl()
{
Operand1 = operand1,
Operand2 = operand2,
Operator = best
};
this.Statements.Insert(bestIndex - 1, impl);
}
}
/// <summary>
/// Parses the input for specified parent.
/// </summary>
/// <param name="parent">The parent.</param>
/// <param name="input">The input.</param>
/// <returns></returns>
/// <exception cref="System.FormatException">
/// Unexpected ']'!
/// or
/// Unexpected ')'!
/// or
/// Unexpected input: + input + !
/// </exception>
private bool Parse(ref StatementBlock parent, ref string input)
{
if (string.IsNullOrEmpty(input))
{
return(false);
}
if (input[0] == '[')
{
var sb = new StatementRead();
sb.Parent = parent;
parent.Statements.Add(sb);
parent = sb;
input = input.Substring(1);
return(true);
}
if (input[0] == ']')
{
if (parent == this.Root || !(parent is StatementRead))
{
throw new FormatException("Unexpected ']'!");
}
var sb = parent;
parent = parent.Parent;
sb.Finish();
input = input.Substring(1);
return(true);
}
if (input[0] == '(')
{
var sb = new StatementGroup();
sb.Parent = parent;
parent.Statements.Add(sb);
parent = sb;
input = input.Substring(1);
return(true);
}
if (input[0] == ')')
{
if (parent == this.Root || !(parent is StatementGroup))
{
throw new FormatException("Unexpected ')'!");
}
var sb = parent;
parent = parent.Parent;
sb.Finish();
input = input.Substring(1);
return(true);
}
int len = 0;
Statement created = StatementOperator.Create(input, ref len);
if (created != null)
{
input = input.Substring(len);
parent.Statements.Add(created);
return(true);
}
created = StatementRegister.Create(input, ref len);
if (created != null)
{
input = input.Substring(len);
parent.Statements.Add(created);
return(true);
}
created = StatementModule.Create(this.Modules, input, ref len);
if (created != null)
{
input = input.Substring(len);
parent.Statements.Add(created);
return(true);
}
created = StatementConstant.Create(input, ref len);
if (created != null)
{
input = input.Substring(len);
parent.Statements.Add(created);
return(true);
}
throw new FormatException("Unexpected input: " + input + "!");
}
