protected override TargetObject DoEvaluateObject(ScriptingContext context)
{
Thread target = context.CurrentThread;
TargetObject obj = expr.EvaluateObject (context);
// array[int]
TargetArrayObject aobj = obj as TargetArrayObject;
if (aobj != null) {
int[] int_indices = GetIntIndices (target, context);
try {
return aobj.GetElement (target, int_indices);
} catch (ArgumentException) {
throw new ScriptingException (
"Index of array expression `{0}' out of bounds.",
expr.Name);
}
}
// pointer[int]
TargetPointerObject pobj = obj as TargetPointerObject;
if (pobj != null) {
// single dimensional array only at present
int[] int_indices = GetIntIndices (target, context);
if (int_indices.Length != 1)
throw new ScriptingException (
"Multi-dimensial arrays of type {0} are not yet supported",
expr.Name);
if (pobj.Type.IsArray)
return pobj.GetArrayElement (target, int_indices [0]);
throw new ScriptingException (
"Variable {0} is not an array type.", expr.Name);
}
// indexers
TargetClassObject sobj = Convert.ToClassObject (target, obj);
if (sobj != null) {
ArrayList props = new ArrayList ();
foreach (TargetPropertyInfo prop in sobj.Type.Properties) {
if (!prop.CanRead)
continue;
props.Add (prop.Getter);
}
if (props.Count == 0)
throw new ScriptingException (
"Indexer `{0}' doesn't have a getter.", expr.Name);
TargetFunctionType[] funcs = new TargetFunctionType [props.Count];
props.CopyTo (funcs, 0);
MethodGroupExpression mg = new MethodGroupExpression (
sobj.Type, sobj, expr.Name + ".this", funcs, true, false);
InvocationExpression invocation = new InvocationExpression (
mg, indices);
invocation.Resolve (context);
return invocation.EvaluateObject (context);
}
throw new ScriptingException (
"{0} is neither an array/pointer type, nor is it " +
"an object with a valid indexer.", expr);
}
protected override bool DoAssign(ScriptingContext context, TargetObject right)
{
Thread target = context.CurrentThread;
TargetObject obj = expr.EvaluateObject (context);
// array[int]
TargetArrayObject aobj = obj as TargetArrayObject;
if (aobj != null) {
int[] int_indices = GetIntIndices (target, context);
try {
aobj.SetElement (target, int_indices, right);
} catch (ArgumentException) {
throw new ScriptingException (
"Index of array expression `{0}' out of bounds.",
expr.Name);
}
return true;
}
// indexers
TargetClassObject sobj = Convert.ToClassObject (target, obj);
if (sobj != null) {
ArrayList props = new ArrayList ();
foreach (TargetPropertyInfo prop in sobj.Type.Properties) {
if (!prop.CanWrite)
continue;
props.Add (prop.Setter);
}
if (props.Count == 0)
throw new ScriptingException (
"Indexer `{0}' doesn't have a setter.", expr.Name);
TargetFunctionType[] funcs = new TargetFunctionType [props.Count];
props.CopyTo (funcs, 0);
MethodGroupExpression mg = new MethodGroupExpression (
sobj.Type, sobj, expr.Name + "[]", funcs, true, false);
Expression[] indexargs = new Expression [indices.Length + 1];
indices.CopyTo (indexargs, 0);
indexargs [indices.Length] = new ArgumentExpression (right);
InvocationExpression invocation = new InvocationExpression (
mg, indexargs);
invocation.Resolve (context);
invocation.Invoke (context, false);
return true;
}
throw new ScriptingException (
"{0} is neither an array/pointer type, nor is it " +
"an object with a valid indexer.", expr);
}
public TargetObject Invoke(ScriptingContext context)
{
TargetClassType stype = Convert.ToClassType (
type_expr.EvaluateType (context));
TargetMethodInfo[] ctors = stype.Constructors;
TargetFunctionType[] funcs = new TargetFunctionType [ctors.Length];
for (int i = 0; i < ctors.Length; i++)
funcs [i] = ctors [i].Type;
MethodGroupExpression mg = new MethodGroupExpression (
stype, null, ".ctor", funcs, false, true);
InvocationExpression invocation = new InvocationExpression (mg, arguments);
invocation.Resolve (context);
return invocation.EvaluateObject (context);
}
protected override bool DoResolve(ScriptingContext context)
{
Expression expr = ParseExpression (context);
if (expr == null)
return false;
expr = expr.Resolve (context);
if (expr == null)
return false;
invocation = expr as InvocationExpression;
if (invocation == null)
throw new ScriptingException (
"Expression `{0}' is not a method.", expr.Name);
return true;
}