/// <summary>
/// Converts any JavaScript value to a primitive value.
/// </summary>
/// <param name="value"> The value to convert. </param>
/// <param name="preferredType"> Specifies whether toString() or valueOf() should be
/// preferred when converting to a primitive. </param>
/// <returns> A primitive (non-object) value. </returns>
public static object ToPrimitive(object value, PrimitiveTypeHint preferredType)
{
if (value is ObjectInstance)
{
return(((ObjectInstance)value).GetPrimitiveValue(preferredType));
}
return(value);
}
/// <summary>
/// Pops the value on the stack, converts it to a primitive value, then pushes the result
/// onto the stack.
/// </summary>
/// <param name="generator"> The IL generator. </param>
/// <param name="fromType"> The type to convert from. </param>
/// <param name="preferredType"> Specifies whether toString() or valueOf() should be
/// preferred when converting to a primitive. </param>
public static void ToPrimitive(ILGenerator generator, Type fromType, PrimitiveTypeHint preferredType)
{
if (fromType == typeof(Nitrassic.Undefined) || fromType == typeof(Nitrassic.Null) ||
fromType == typeof(bool) || fromType == typeof(string) || fromType == typeof(ConcatenatedString) ||
fromType == typeof(int) || fromType == typeof(uint) || fromType == typeof(double))
{
return;
}
else if (fromType == typeof(object) || fromType == typeof(Library.ObjectInstance))
{
// Otherwise, fall back to calling TypeConverter.ToPrimitive()
if (PrimitiveTypeUtilities.IsValueType(fromType))
{
generator.Box(fromType);
}
generator.LoadInt32((int)preferredType);
generator.Call(ReflectionHelpers.TypeConverter_ToPrimitive);
}
else
{
throw new NotImplementedException("Unsupported primitive type: " + fromType);
}
}
// JAVASCRIPT INTERNAL FUNCTIONS
//_________________________________________________________________________________________
/// <summary>
/// Returns a primitive value that represents the current object. Used by the addition and
/// equality operators.
/// </summary>
/// <param name="hint"> Indicates the preferred type of the result. </param>
/// <returns> A primitive value that represents the current object. </returns>
protected internal override object GetPrimitiveValue(PrimitiveTypeHint typeHint)
{
if (typeHint == PrimitiveTypeHint.None)
return base.GetPrimitiveValue(PrimitiveTypeHint.String);
return base.GetPrimitiveValue(typeHint);
}
/// <summary>
/// Pops the value on the stack, converts it to a primitive value, then pushes the result
/// onto the stack.
/// </summary>
/// <param name="generator"> The IL generator. </param>
/// <param name="fromType"> The type to convert from. </param>
/// <param name="preferredType"> Specifies whether toString() or valueOf() should be
/// preferred when converting to a primitive. </param>
public static void ToPrimitive(ILGenerator generator, PrimitiveType fromType, PrimitiveTypeHint preferredType)
{
switch (fromType)
{
case PrimitiveType.Undefined:
case PrimitiveType.Null:
case PrimitiveType.Bool:
case PrimitiveType.String:
case PrimitiveType.ConcatenatedString:
case PrimitiveType.Int32:
case PrimitiveType.UInt32:
case PrimitiveType.Number:
// These are primitives already.
break;
case PrimitiveType.Any:
case PrimitiveType.Object:
// Otherwise, fall back to calling TypeConverter.ToPrimitive()
generator.LoadEnumValue(preferredType);
generator.Call(ReflectionHelpers.TypeConverter_ToPrimitive);
break;
default:
throw new NotImplementedException(string.Format("Unsupported primitive type: {0}", fromType));
}
}
// OTHERS
//_________________________________________________________________________________________
/// <summary>
/// Returns a primitive value that represents the current object. Used by the addition and
/// equality operators.
/// </summary>
/// <param name="hint"> Indicates the preferred type of the result. </param>
/// <returns> A primitive value that represents the current object. </returns>
protected internal virtual object GetPrimitiveValue(PrimitiveTypeHint typeHint)
{
if (typeHint == PrimitiveTypeHint.None || typeHint == PrimitiveTypeHint.Number)
{
// Try calling valueOf().
object valueOfResult;
if (TryCallMemberFunction(out valueOfResult, "valueOf") == true)
{
// Return value must be primitive.
if (valueOfResult is double || TypeUtilities.IsPrimitive(valueOfResult) == true)
return valueOfResult;
}
// Try calling toString().
object toStringResult;
if (TryCallMemberFunction(out toStringResult, "toString") == true)
{
// Return value must be primitive.
if (toStringResult is string || TypeUtilities.IsPrimitive(toStringResult) == true)
return toStringResult;
}
}
else
{
// Try calling toString().
object toStringResult;
if (TryCallMemberFunction(out toStringResult, "toString") == true)
{
// Return value must be primitive.
if (toStringResult is string || TypeUtilities.IsPrimitive(toStringResult) == true)
return toStringResult;
}
// Try calling valueOf().
object valueOfResult;
if (TryCallMemberFunction(out valueOfResult, "valueOf") == true)
{
// Return value must be primitive.
if (valueOfResult is double || TypeUtilities.IsPrimitive(valueOfResult) == true)
return valueOfResult;
}
}
throw new JavaScriptException(this.Engine, "TypeError", "Attempted conversion of the object to a primitive value failed. Check the toString() and valueOf() functions.");
}
/// <summary>
/// Pops the value on the stack, converts it to a primitive value, then pushes the result
/// onto the stack.
/// </summary>
/// <param name="generator"> The IL generator. </param>
/// <param name="fromType"> The type to convert from. </param>
/// <param name="preferredType"> Specifies whether toString() or valueOf() should be
/// preferred when converting to a primitive. </param>
public static void ToPrimitive(ILGenerator generator, PrimitiveType fromType, PrimitiveTypeHint preferredType)
{
switch (fromType)
{
case PrimitiveType.Undefined:
case PrimitiveType.Null:
case PrimitiveType.Bool:
case PrimitiveType.String:
case PrimitiveType.ConcatenatedString:
case PrimitiveType.Int32:
case PrimitiveType.UInt32:
case PrimitiveType.Number:
// These are primitives already.
break;
case PrimitiveType.Any:
case PrimitiveType.Object:
// Otherwise, fall back to calling TypeConverter.ToPrimitive()
generator.LoadInt32((int)preferredType);
generator.Call(ReflectionHelpers.TypeConverter_ToPrimitive);
break;
default:
throw new NotImplementedException(string.Format("Unsupported primitive type: {0}", fromType));
}
}
// OTHERS
//_________________________________________________________________________________________
/// <summary>
/// Returns a primitive value that represents the current object. Used by the addition and
/// equality operators.
/// </summary>
/// <param name="typeHint"> Indicates the preferred type of the result. </param>
/// <returns> A primitive value that represents the current object. </returns>
internal object GetPrimitiveValue(PrimitiveTypeHint typeHint)
{
// The first step is to try calling the @@toPrimitive symbol.
string hintStr;
switch (typeHint)
{
case PrimitiveTypeHint.None:
hintStr = "default";
break;
case PrimitiveTypeHint.Number:
hintStr = "number";
break;
case PrimitiveTypeHint.String:
hintStr = "string";
break;
default:
throw new InvalidOperationException($"Unsupported PrimitiveTypeHint value '{typeHint}'.");
}
object toPrimitiveResult;
if (TryCallMemberFunction(out toPrimitiveResult, Engine.Symbol.ToPrimitive, hintStr) == true)
{
// Return value must be primitive.
if (TypeUtilities.IsPrimitive(toPrimitiveResult) == false)
throw new JavaScriptException(Engine, ErrorType.TypeError, "Cannot convert object to primitive value.");
return toPrimitiveResult;
}
// If that didn't work.
return GetPrimitiveValuePreES6(typeHint);
}
