public override JsInstance this[string index] {
get {
if (index == THIS && thisDescriptor != null)
{
return(thisDescriptor.Get(this));
}
if (index == ARGUMENTS && argumentsDescriptor != null)
{
return(argumentsDescriptor.Get(this));
}
return(base[index]); // will use overriden GetDescriptor
}
set {
if (index == THIS)
{
if (thisDescriptor != null)
{
thisDescriptor.Set(this, value);
}
else
{
DefineOwnProperty(thisDescriptor = new ValueDescriptor(this, index, value));
}
}
else if (index == ARGUMENTS)
{
if (argumentsDescriptor != null)
{
argumentsDescriptor.Set(this, value);
}
else
{
DefineOwnProperty(argumentsDescriptor = new ValueDescriptor(this, index, value));
}
}
else
{
Descriptor d = GetDescriptor(index);
if (d != null)
{
d.Set(this, value);
}
else if (globalScope != null)
{
// TODO: move to Execution visitor
// define missing property in the global scope
globalScope.DefineOwnProperty(index, value);
}
else
{
// this scope is a global scope
DefineOwnProperty(index, value);
}
}
}
}
public override JsInstance this[string index] {
get {
if (index == THIS && thisDescriptor != null)
{
return(thisDescriptor.Get(this));
}
if (index == ARGUMENTS && argumentsDescriptor != null)
{
return(argumentsDescriptor.Get(this));
}
return(base[index]); // will use overriden GetDescriptor
}
set {
if (index == THIS)
{
if (thisDescriptor != null)
{
thisDescriptor.Set(this, value);
}
else
{
DefineOwnProperty(index, thisDescriptor = new ValueDescriptor(this, index, value));
}
}
else if (index == ARGUMENTS)
{
if (argumentsDescriptor != null)
{
argumentsDescriptor.Set(this, value);
}
else
{
DefineOwnProperty(index, argumentsDescriptor = new ValueDescriptor(this, index, value));
}
}
else
{
Descriptor d = GetDescriptor(index);
if (d != null)
{
// we have a property in the scopes hierarchy or in the bag
if (d.Owner == bag || d.Owner == this || d.Owner.IsPrototypeOf(this))
{
// if this is an own property of the bag or in scopes
d.Set(d.Owner, value);
}
else
{
// this property should be from one of prototypes of the bag
if (bag != null)
{
bag[index] = value;
}
}
}
else if (globalScope != null)
{
// define missing property in the global scope
globalScope.DefineOwnProperty(index, value);
}
else
{
// this scope is a global scope
DefineOwnProperty(index, value);
}
}
}
}
public void Visit(JsonExpression json)
{
JsObject instance = Global.ObjectClass.New();
JsScope scope = new JsScope() { Prototype = CurrentScope };
scope.DefineOwnProperty(JsInstance.THIS, instance);
EnterScope(scope);
try
{
foreach (var item in json.Values)
{
item.Value.Accept(this);
instance.DefineOwnProperty(item.Key, Result);
}
}
finally
{
ExitScope();
}
Result = instance;
}
public void ExecuteFunction(JsFunction function, JsDictionaryObject that, JsInstance[] parameters, Type[] genericParameters)
{
if (function == null) {
return;
}
if (recursionLevel++ > MaxRecursions) {
throw new JsException(Global.ErrorClass.New("Too many recursions in the script."));
}
// ecma chapter 10.
// TODO: move creation of the activation object to the JsFunction
// create new argument object and instantinate arguments into it
JsArguments args = new JsArguments(Global, function, parameters);
// create new activation object and copy instantinated arguments to it
// Activation should be before the function.Scope hierarchy
JsScope functionScope = new JsScope(function.Scope ?? GlobalScope);
for (int i = 0; i < function.Arguments.Count; i++)
if (i < parameters.Length)
functionScope.DefineOwnProperty(
new LinkedDescriptor(
functionScope,
function.Arguments[i],
args.GetDescriptor(i.ToString()),
args
)
);
else
functionScope.DefineOwnProperty(
new ValueDescriptor(
functionScope,
function.Arguments[i],
JsUndefined.Instance
)
);
// define arguments variable
if (HasOption(Options.Strict))
functionScope.DefineOwnProperty(JsScope.ARGUMENTS, args);
else
args.DefineOwnProperty(JsScope.ARGUMENTS, args);
// set this variable
if (that != null)
functionScope.DefineOwnProperty(JsScope.THIS, that);
else
functionScope.DefineOwnProperty(JsScope.THIS, that = Global as JsObject);
// enter activation object
EnterScope(functionScope);
try {
PermissionSet.PermitOnly();
if (genericParameters != null && genericParameters.Length > 0)
Result = function.Execute(this, that, parameters, genericParameters);
else
Result = function.Execute(this, that, parameters);
// Resets the return flag
if (exit) {
exit = false;
}
}
finally {
// return to previous execution state
ExitScope();
CodeAccessPermission.RevertPermitOnly();
recursionLevel--;
}
}
public void ExecuteFunction(JsFunction function, JsDictionaryObject that, JsInstance[] parameters)
{
if (function == null)
{
return;
}
JsScope functionScope = new JsScope();
JsArguments args = new JsArguments(Global, function, parameters);
functionScope.Prototype = args;
if (HasOption(Options.Strict))
functionScope.DefineOwnProperty(JsInstance.ARGUMENTS, args);
else
functionScope.Prototype.DefineOwnProperty(JsInstance.ARGUMENTS, args);
if (that != null)
functionScope.DefineOwnProperty(JsInstance.THIS, that);
functionScope.Extensible = false;
//for (int i = function.DeclaringScopes.Count - 1; i >= 0; i--)
//{
// EnterScope(function.DeclaringScopes[i]);
//}
EnterScope(function);
EnterScope(functionScope);
try
{
PermissionSet.PermitOnly();
Result = function.Execute(this, that, parameters);
// Resets the return flag
if (exit)
{
exit = false;
}
}
finally
{
ExitScope();
ExitScope();
CodeAccessPermission.RevertPermitOnly();
}
}
