/// <summary>
/// Assign a value to an already defined variable.
/// </summary>
/// <param name="varName"></param>
/// <param name="value"></param>
public void Assign(String varName, Value value)
{
if (variables.ContainsKey(varName))
{
variables[varName] = value;
}
else if (HasParent())
{
// The variable was not declared in this scope, so let
// the parent scope re-assign it
parent.Assign(varName, value);
}
else
{
// The variable was not declared at all
throw new CompilerException(-1, 218, varName);
}
}
public override Value Invoke(List<Value> parameters)
{
if (parameters.Count == parameterNames.Count)
{
// create new scope for the method call
var methodScope = new Scope();
for (int i = 0; i < parameterNames.Count; i++)
{
methodScope.Define(parameterNames[i]);
methodScope.Assign(parameterNames[i], parameters[i]);
}
var nodeStream = new CommonTreeNodeStream(functionBody);
// Create a tree walker to evaluate this method's code block
var walker = new SGLTreeWalker(nodeStream, methodScope);
// Ok, executing the function then
Value returnValue = walker.main().Evaluate();
if (returnValue.Type == ValType.Return)
{
return returnValue.ReturnValue;
}
else
{
return returnValue;
}
// we shouldn't check the return type
/*if (!returnValue.GetVarType().Equals(this.returnType))
{
throw new Exception("The method doesn't return the expected return type (" + returnValue.ToString() + " is not from type " + this.returnType + ")");
}*/
}
throw new CompilerException(definedLine, 318, name, parameterNames.Count.ToString(), parameters.Count.ToString());
}
public Value Invoke(Value objectVar, List<Value> parameters)
{
if (parameters.Count == parameterNames.Count)
{
// create new scope for the method call
var methodScope = new Scope();
methodScope.Define("this");
methodScope.Assign("this", objectVar);
for (int i = 0; i < parameterNames.Count; i++)
{
methodScope.Define(parameterNames[i]);
methodScope.Assign(parameterNames[i], parameters[i]);
}
var nodeStream = new CommonTreeNodeStream(functionBody);
// Create a tree walker to evaluate this method's code block
var walker = new SGLTreeWalker(nodeStream, methodScope);
Value returnValue = null;
// Ok, executing the function then
returnValue = walker.main().Evaluate();
// we shouldn't check the return type
/*if (!returnValue.GetVarType().Equals(this.returnType))
{
throw new Exception("The method doesn't return the expected return type (" + returnValue.ToString() + " is not from type " + this.returnType + ")");
}*/
return returnValue;
}
// TODO: Exception
throw new Exception();
}
