public static OperationCondition Parse(List <Argument> arguments)
{
if (arguments.Count < 2)
{
return(null); // Not enough arguments
}
var condition = new OperationCondition();
int offset = condition.ParseNot(arguments);
condition.LeftVariable = Variable.Parse(arguments[offset].GetAsText());
if (condition.LeftVariable == null)
{
return(null);
}
condition.Operation = arguments[offset + 1].GetAsText();
if (!Operators.Contains(condition.Operation))
{
return(null); // Invalid operation
}
condition.RightVariable = Variable.Parse(arguments[offset + 2].GetAsText());
if (condition.RightVariable == null)
{
return(null);
}
condition.LastIndex = offset + 2;
return(condition);
}
public Command.Command Filter(Command.Command command)
{
if (command.GetCommandName() != "if")
{
return(command);
}
// Remove the command name to make working with the arguments easier
command.Arguments.RemoveAt(0);
// Split if statement into individual conditions by seperating them at "&&"
List <List <Argument> > ifConditionArguments = new List <List <Argument> > {
new List <Argument>()
};
int pieceIndex = 0;
foreach (Argument argument in command.Arguments)
{
string argText = argument.GetAsText();
if (argText == "&&")
{
ifConditionArguments.Add(new List <Argument>());
pieceIndex++;
}
else
{
ifConditionArguments[pieceIndex].Add(new Argument(argText));
}
}
List <Condition> conditions = new List <Condition>();
foreach (var arguments in ifConditionArguments)
{
// Matches condition
Condition condition = MatchesCondition.Parse(arguments);
// Operation condition
if (condition == null)
{
condition = OperationCondition.Parse(arguments);
}
if (condition == null)
{
throw new Exception("Invalid if statement condition");
}
else
{
conditions.Add(condition);
}
}
// Get all the left over arguments; these will make up the command that will be ran if the conditions are met
int startIndex = conditions.Last().LastIndex + 1;
List <Argument> leftOver = new List <Argument>(command.Arguments.GetRange(startIndex, command.Arguments.Count - startIndex));
Command.Command successCommand = new Command.Command(leftOver);
// Replace existing command with an if token
command.Arguments.Clear();
command.Arguments.Add(new Argument(new IfToken(conditions)));
command.Arguments.AddRange(successCommand.Arguments);
return(command);
}