void ParseVarset(ScopeGroup getter, ScopeGroup scope, VarSetNode varSetNode)
{
var varSetData = new ParseExpressionTree(this, getter, scope, varSetNode.Variable);
if (!(varSetData.ResultingVariable is IndexedVar))
{
throw SyntaxErrorException.VariableIsReadonly(varSetData.ResultingVariable.Name, varSetNode.Location);
}
IndexedVar variable = (IndexedVar)varSetData.ResultingVariable;
Element[] index = varSetData.VariableIndex;
Element value = null;
if (varSetNode.Value != null)
{
value = ParseExpression(getter, scope, varSetNode.Value);
}
Element initialVar = variable.GetVariable(varSetData.Target);
Operation?operation = null;
switch (varSetNode.Operation)
{
case "+=":
operation = Operation.Add;
break;
case "-=":
operation = Operation.Subtract;
break;
case "*=":
operation = Operation.Multiply;
break;
case "/=":
operation = Operation.Divide;
break;
case "^=":
operation = Operation.RaiseToPower;
break;
case "%=":
operation = Operation.Modulo;
break;
case "++":
operation = Operation.Add;
value = 1;
break;
case "--":
operation = Operation.Subtract;
value = 1;
break;
}
if (operation == null)
{
Actions.AddRange(variable.SetVariable(value, varSetData.Target, index));
}
else
{
Actions.AddRange(variable.ModifyVariable((Operation)operation, value, varSetData.Target, index));
}
}