protected override Expression DoResolve(ScriptingContext context)
{
expr = expr.Resolve (context);
if (expr == null)
return null;
resolved = true;
return this;
}
public TargetFunctionType EvaluateMethod(ScriptingContext context,
LocationType type, Expression [] types)
{
if (!resolved)
throw new InvalidOperationException (
String.Format (
"Some clown tried to evaluate the " +
"unresolved expression `{0}'", Name));
try {
TargetFunctionType func = DoEvaluateMethod (context, type, types);
if (func == null)
throw new ScriptingException (
"Expression `{0}' is not a method", Name);
return func;
} catch (LocationInvalidException ex) {
throw new ScriptingException (
"Location of variable `{0}' is invalid: {1}",
Name, ex.Message);
}
}
public ConditionalExpression(Expression test, Expression true_expr, Expression false_expr)
{
this.test = test;
this.true_expr = true_expr;
this.false_expr = false_expr;
}
public BinaryOperator(Kind kind, Expression left, Expression right)
{
this.kind = kind;
this.left = left;
this.right = right;
}
private long GetValue(ScriptingContext context, Expression expr)
{
object val = expr.Evaluate (context);
again:
if (val is int)
return (long) (int) val;
else if (val is uint)
return (long) (uint) val;
else if (val is ulong)
return (long) (ulong) val;
else if (val is long)
return (long) val;
else if (val is TargetPointerObject) {
TargetPointerObject pobj = (TargetPointerObject) val;
return pobj.GetAddress (context.CurrentThread).Address;
} else if (val is TargetFundamentalObject) {
TargetFundamentalObject fobj = (TargetFundamentalObject) val;
val = fobj.GetObject (context.CurrentThread);
if (!(val is TargetFundamentalObject))
goto again;
}
throw new ScriptingException ("Cannot evaluate expression `{0}'", expr.Name);
}
protected override TargetFunctionType DoEvaluateMethod(ScriptingContext context,
LocationType type,
Expression[] types)
{
switch (type) {
case LocationType.PropertyGetter:
case LocationType.PropertySetter:
TargetPropertyInfo property = Member as TargetPropertyInfo;
if (property == null)
return null;
if (type == LocationType.PropertyGetter) {
if (!property.CanRead)
throw new ScriptingException (
"Property {0} doesn't have a getter.", Name);
return property.Getter;
} else {
if (!property.CanWrite)
throw new ScriptingException (
"Property {0} doesn't have a setter.", Name);
return property.Setter;
}
case LocationType.EventAdd:
case LocationType.EventRemove:
TargetEventInfo ev = Member as TargetEventInfo;
if (ev == null)
return null;
if (type == LocationType.EventAdd)
return ev.Add;
else
return ev.Remove;
case LocationType.Method:
case LocationType.DelegateInvoke:
MethodGroupExpression mg = InvocationExpression.ResolveDelegate (
context, this);
if (mg == null)
return null;
return mg.EvaluateMethod (context, LocationType.Method, types);
default:
return null;
}
}
public TypeOfExpression(Expression expr)
{
this.expr = expr;
}
protected override SourceLocation DoEvaluateSource(ScriptingContext context)
{
Expression[] types = new Expression [arguments.Length];
TargetType[] argtypes = new TargetType [types.Length];
for (int i = 0; i < arguments.Length; i++) {
types [i] = arguments [i].ResolveType (context);
argtypes [i] = types [i].EvaluateType (context);
}
TargetFunctionType func = method_expr.OverloadResolve (context, argtypes);
if (func != null)
return new SourceLocation (func);
return null;
}
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 static MethodGroupExpression ResolveDelegate(ScriptingContext context,
Expression expr)
{
TargetClassType ctype = Convert.ToClassType (expr.EvaluateType (context));
if (ctype == null)
return null;
TargetClassObject cobj;
try {
cobj = Convert.ToClassObject (
context.CurrentThread, expr.EvaluateObject (context));
} catch {
cobj = null;
}
TargetClassType delegate_type = ctype.Language.DelegateType;
if (!CastExpression.TryCast (context, ctype, delegate_type))
return null;
TargetFunctionType invoke = null;
foreach (TargetMethodInfo method in ctype.Methods) {
if (method.Name == "Invoke") {
invoke = method.Type;
break;
}
}
if (invoke == null)
return null;
TargetFunctionType[] methods = new TargetFunctionType[] { invoke };
MethodGroupExpression mg = new MethodGroupExpression (
ctype, cobj, "Invoke", methods, true, false);
return mg;
}
protected override TargetFunctionType DoEvaluateMethod(ScriptingContext context,
LocationType type,
Expression[] types)
{
return method_expr.EvaluateMethod (context, type, types);
}
public InvocationExpression(Expression expr, Expression[] arguments)
{
this.expr = expr;
this.arguments = arguments;
name = String.Format ("{0} ()", expr.Name);
}
protected virtual TargetFunctionType DoEvaluateMethod(ScriptingContext context,
LocationType type,
Expression[] types)
{
return null;
}
public ArrayAccessExpression(Expression expr, Expression[] indices)
{
this.expr = expr;
this.indices = indices;
StringBuilder sb = new StringBuilder("");
bool comma = false;
foreach (Expression index in indices) {
if (comma) sb.Append(",");
sb.Append (index.ToString());
comma = true;
}
name = String.Format ("{0}[{1}]", expr.Name, sb.ToString());
}
public PointerTypeExpression(Expression expr)
{
this.expr = expr;
}
public MemberAccessExpression(Expression left, string name)
{
this.left = left;
this.name = name;
}
protected override Expression DoResolve(ScriptingContext context)
{
int i;
expr = expr.Resolve (context);
if (expr == null)
return null;
for (i = 0; i < indices.Length; i ++) {
indices[i] = indices[i].Resolve (context);
if (indices[i] == null)
return null;
}
resolved = true;
return this;
}
protected override TargetFunctionType DoEvaluateMethod(ScriptingContext context,
LocationType type,
Expression[] types)
{
if (type != LocationType.Method)
return null;
if (types == null) {
if (methods.Length == 1)
return (TargetFunctionType) methods [0];
throw new ScriptingException (
"Ambiguous method `{0}'; need to use full name", Name);
}
TargetType[] argtypes = new TargetType [types.Length];
for (int i = 0; i < types.Length; i++)
argtypes [i] = types [i].EvaluateType (context);
TargetFunctionType func = OverloadResolve (context, argtypes);
if (func != null)
return func;
return context.Interpreter.QueryMethod (methods);
}
int GetIntIndex(Thread target, Expression index, ScriptingContext context)
{
try {
object idx = index.Evaluate (context);
if (idx is int)
return (int) idx;
else if (idx is long)
return (int) (long) idx;
TargetFundamentalObject obj = (TargetFundamentalObject) idx;
return (int) obj.GetObject (target);
} catch (Exception e) {
throw new ScriptingException (
"Cannot convert {0} to an integer for indexing: {1}",
index, e);
}
}
public NewExpression(Expression type_expr, Expression[] arguments)
{
this.type_expr = type_expr;
this.arguments = arguments;
name = String.Format ("new {0} ()", type_expr.Name);
}
public AssignmentExpression(Expression left, Expression right)
{
this.left = left;
this.right = right;
name = left.Name + "=" + right.Name;
}
protected override Expression DoResolve(ScriptingContext context)
{
type_expr = type_expr.ResolveType (context);
if (type_expr == null)
return null;
for (int i = 0; i < arguments.Length; i++) {
arguments [i] = arguments [i].Resolve (context);
if (arguments [i] == null)
return null;
}
resolved = true;
return this;
}
protected override Expression DoResolve(ScriptingContext context)
{
left = left.Resolve (context);
if (left == null)
return null;
right = right.Resolve (context);
if (right == null)
return null;
resolved = true;
return this;
}
public ParentExpression(Expression expr, int level)
{
this.expr = expr;
this.level = level;
if (level > 0)
name = String.Format ("$parent+{0} ({1})", level, expr.Name);
else
name = String.Format ("$parent ({0})", expr.Name);
}
public CastExpression(Expression target, Expression expr)
{
this.target = target;
this.expr = expr;
this.name = String.Format ("(({0}) {1})", target.Name, expr.Name);
}
public PointerDereferenceExpression(Expression expr, bool current_ok)
{
this.expr = expr;
this.current_ok = current_ok;
name = '*' + expr.Name;
}
TargetObject DoCast(ScriptingContext context, Expression expr,
TargetType target_type)
{
TargetObject source = expr.EvaluateObject (context);
if (source == null)
return null;
if (target_type is TargetObjectType) {
if (((source is TargetClassObject) && !source.Type.IsByRef) ||
(source is TargetFundamentalObject))
return target_type.Language.CreateBoxedObject (context.CurrentThread, source);
if (source is TargetObjectObject)
return source;
throw new ScriptingException (
"Cannot box object `{0}': not a value-type", expr.Name);
}
if (target_type is TargetPointerType) {
TargetAddress address;
PointerExpression pexpr = expr as PointerExpression;
if (pexpr != null)
address = pexpr.EvaluateAddress (context);
else {
TargetPointerType ptype = expr.EvaluateType (context)
as TargetPointerType;
if ((ptype == null) || ptype.IsTypesafe)
return null;
pexpr = new AddressOfExpression (expr);
pexpr.Resolve (context);
address = pexpr.EvaluateAddress (context);
}
return ((TargetPointerType) target_type).GetObject (address);
}
if (target_type is TargetFundamentalType) {
TargetFundamentalObject fobj = expr.EvaluateObject (context)
as TargetFundamentalObject;
if (fobj == null)
return null;
TargetFundamentalType ftype = target_type as TargetFundamentalType;
return Convert.ExplicitFundamentalConversion (context, fobj, ftype);
}
TargetClassType ctype = Convert.ToClassType (target_type);
TargetClassObject source_cobj = Convert.ToClassObject (context.CurrentThread, source);
if (source_cobj == null)
throw new ScriptingException (
"Variable {0} is not a class type.", expr.Name);
return TryCast (context, source_cobj, ctype);
}
public AddressOfExpression(Expression expr)
{
this.expr = expr;
name = '&' + expr.Name;
}
protected override Expression DoResolve(ScriptingContext context)
{
this.test = this.test.Resolve (context);
if (this.test == null)
return null;
this.true_expr = this.true_expr.Resolve (context);
if (this.true_expr == null)
return null;
this.false_expr = this.false_expr.Resolve (context);
if (this.false_expr == null)
return null;
resolved = true;
return this;
}
protected override bool DoResolve(ScriptingContext context)
{
if (Repeating)
return true;
expression = ParseExpression (context);
if (expression == null)
return false;
expression = expression.Resolve (context);
return expression != null;
}