private JsValue LastIndexOf(JsValue thisObj, JsValue[] arguments)
{
var o = ArrayOperations.For(Engine, thisObj);
var len = o.GetLongLength();
if (len == 0)
{
return(-1);
}
var n = arguments.Length > 1
? TypeConverter.ToInteger(arguments[1])
: len - 1;
double k;
if (n >= 0)
{
k = System.Math.Min(n, len - 1); // min
}
else
{
k = len - System.Math.Abs(n);
}
if (k < 0 || k > uint.MaxValue)
{
return(-1);
}
var searchElement = arguments.At(0);
var i = (uint)k;
for (;; i--)
{
var kPresent = o.HasProperty(i);
if (kPresent)
{
var elementK = o.Get(i);
var same = JintBinaryExpression.StrictlyEqual(elementK, searchElement);
if (same)
{
return(i);
}
}
if (i == 0)
{
break;
}
}
return(-1);
}
public Completion Execute(JsValue input)
{
if (!_initialized)
{
Initialize();
_initialized = true;
}
JsValue v = Undefined.Instance;
Location l = _engine._lastSyntaxNode.Location;
JintSwitchCase defaultCase = null;
bool hit = false;
for (var i = 0; i < (uint)_jintSwitchBlock.Length; i++)
{
var clause = _jintSwitchBlock[i];
LexicalEnvironment oldEnv = null;
if (clause.LexicalDeclarations != null)
{
oldEnv = _engine.ExecutionContext.LexicalEnvironment;
var blockEnv = LexicalEnvironment.NewDeclarativeEnvironment(_engine, oldEnv);
JintStatementList.BlockDeclarationInstantiation(blockEnv, clause.LexicalDeclarations);
_engine.UpdateLexicalEnvironment(blockEnv);
}
if (clause.Test == null)
{
defaultCase = clause;
}
else
{
var clauseSelector = clause.Test.GetValue();
if (JintBinaryExpression.StrictlyEqual(clauseSelector, input))
{
hit = true;
}
}
if (hit && clause.Consequent != null)
{
var r = clause.Consequent.Execute();
if (oldEnv != null)
{
_engine.UpdateLexicalEnvironment(oldEnv);
}
if (r.Type != CompletionType.Normal)
{
return(r);
}
l = r.Location;
v = r.Value ?? Undefined.Instance;
}
}
// do we need to execute the default case ?
if (hit == false && defaultCase != null)
{
LexicalEnvironment oldEnv = null;
if (defaultCase.LexicalDeclarations != null)
{
oldEnv = _engine.ExecutionContext.LexicalEnvironment;
var blockEnv = LexicalEnvironment.NewDeclarativeEnvironment(_engine, oldEnv);
JintStatementList.BlockDeclarationInstantiation(blockEnv, defaultCase.LexicalDeclarations);
_engine.UpdateLexicalEnvironment(blockEnv);
}
var r = defaultCase.Consequent.Execute();
if (oldEnv != null)
{
_engine.UpdateLexicalEnvironment(oldEnv);
}
if (r.Type != CompletionType.Normal)
{
return(r);
}
l = r.Location;
v = r.Value ?? Undefined.Instance;
}
return(new Completion(CompletionType.Normal, v, null, l));
}
private JsValue IndexOf(JsValue thisObj, JsValue[] arguments)
{
var o = ArrayOperations.For(Engine, thisObj);
var len = o.GetLongLength();
if (len == 0)
{
return(-1);
}
var startIndex = arguments.Length > 1
? TypeConverter.ToNumber(arguments[1])
: 0;
if (startIndex > uint.MaxValue)
{
return(-1);
}
ulong k;
if (startIndex < 0)
{
var abs = System.Math.Abs(startIndex);
ulong temp = len - (uint)abs;
if (abs > len || temp < 0)
{
temp = 0;
}
k = temp;
}
else
{
k = (ulong)startIndex;
}
if (k >= len)
{
return(-1);
}
ulong smallestIndex = o.GetSmallestIndex(len);
if (smallestIndex > k)
{
k = smallestIndex;
}
var searchElement = arguments.At(0);
for (; k < len; k++)
{
var kPresent = o.HasProperty(k);
if (kPresent)
{
var elementK = o.Get(k);
var same = JintBinaryExpression.StrictlyEqual(elementK, searchElement);
if (same)
{
return(k);
}
}
}
return(-1);
}