| private CallFromNative ( string function, object thisObject ) : object | ||
| function | string | The name of the caller function. |
| thisObject | object | The value of the "this" keyword within the function. |
| return | object | |
public TypedArrayInstance From(object source, FunctionInstance mapFn = null, object thisArg = null)
{
var items = TypeConverter.ToObject(Engine, source);
var iterator = TypeUtilities.GetIterator(Engine, items);
if (iterator != null)
{
// Loop.
var values = new List <object>();
foreach (var value in TypeUtilities.Iterate(Engine, iterator))
{
// Collect the values.
values.Add(value);
}
// Convert the values into a typed array instance.
var result = new TypedArrayInstance(this.InstancePrototype, this.type,
Engine.ArrayBuffer.Construct(values.Count * BytesPerElement), 0, values.Count);
for (int i = 0; i < values.Count; i++)
{
if (mapFn != null)
{
result[i] = mapFn.CallFromNative("from", thisArg, values[i], i);
}
else
{
result[i] = values[i];
}
}
return(result);
}
else
{
// There was no iterator symbol value, so fall back on the alternate method.
int length = TypeConverter.ToInt32(items["length"]);
var result = new TypedArrayInstance(this.InstancePrototype, this.type, Engine.ArrayBuffer.Construct(length * BytesPerElement), 0, length);
for (int i = 0; i < length; i++)
{
if (mapFn != null)
{
result[i] = mapFn.CallFromNative("from", thisArg, items[i], i);
}
else
{
result[i] = items[i];
}
}
return(result);
}
}
/// <summary>
/// Creates a new array with the elements from this array that pass the test implemented by
/// the given function.
/// </summary>
/// <param name="callbackFunction"> A user-defined function that is called for each element in the
/// array. This function is called with three arguments: the value of the element, the
/// index of the element, and the array that is being operated on. The function should
/// return <c>true</c> or <c>false</c>. </param>
/// <param name="context"> The value of <c>this</c> in the context of the callback function. </param>
/// <returns> A copy of this array but with only those elements which produce <c>true</c>
/// when passed to the provided function. </returns>
public ObjectInstance Filter(FunctionInstance callbackFunction, ObjectInstance context)
{
// Create a new array to hold the new values.
var result = new List <T>(Length / 2);
for (int i = 0; i < Length; i++)
{
// Get the value of the array element.
T elementValue = this[i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
bool includeInArray = TypeConverter.ToBoolean(callbackFunction.CallFromNative("filter", context, elementValue, i, WrappedInstance));
// Store the result if the callback function returned true.
if (includeInArray == true)
{
result.Add(elementValue);
}
}
}
return(ConstructArray(result.ToArray()));
}
public TypedArrayInstance Sort(FunctionInstance comparisonFunction = null)
{
Comparison <object> comparer;
if (comparisonFunction == null)
{
// Default comparer.
comparer = (a, b) =>
{
double x = TypeConverter.ToNumber(a);
double y = TypeConverter.ToNumber(b);
if (x < y)
{
return(-1);
}
if (x > y)
{
return(1);
}
if (double.IsNaN(x) && double.IsNaN(y))
{
return(0);
}
if (double.IsNaN(x))
{
return(1);
}
if (double.IsNaN(y))
{
return(-1);
}
if (TypeUtilities.IsNegativeZero(x) && TypeUtilities.IsPositiveZero(y))
{
return(-1);
}
if (TypeUtilities.IsPositiveZero(x) && TypeUtilities.IsNegativeZero(y))
{
return(1);
}
return(0);
};
}
else
{
// Custom comparer.
comparer = (a, b) =>
{
var v = TypeConverter.ToNumber(comparisonFunction.CallFromNative("sort", null, a, b));
if (double.IsNaN(v))
{
return(0);
}
return(Math.Sign(v));
};
}
return((TypedArrayInstance) new TypedArrayAdapter(this).Sort(comparer));
}
/// <summary>
/// Calls the given user-defined function once per element in the array.
/// </summary>
/// <param name="callbackFunction"> A user-defined function that is called for each element in the
/// array. This function is called with three arguments: the value of the element, the
/// index of the element, and the array that is being operated on. </param>
/// <param name="context"> The value of <c>this</c> in the context of the callback function. </param>
public void ForEach(FunctionInstance callbackFunction, ObjectInstance context)
{
for (int i = 0; i < Length; i++)
{
// Get the value of the array element.
object elementValue = this[i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
callbackFunction.CallFromNative("forEach", context, elementValue, i, WrappedInstance);
}
}
}
/// <summary>
/// Determines if at least one element of the array matches criteria defined by the given
/// user-defined function.
/// </summary>
/// <param name="callbackFunction"> A user-defined function that is called for each element in the
/// array. This function is called with three arguments: the value of the element, the
/// index of the element, and the array that is being operated on. The function should
/// return <c>true</c> or <c>false</c>. </param>
/// <param name="context"> The value of <c>this</c> in the context of the callback function. </param>
/// <returns> <c>true</c> if at least one element of the array matches criteria defined by
/// the given user-defined function; <c>false</c> otherwise. </returns>
public bool Some(FunctionInstance callbackFunction, ObjectInstance context)
{
for (int i = 0; i < Length; i++)
{
// Get the value of the array element.
object elementValue = this[i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
if (TypeConverter.ToBoolean(callbackFunction.CallFromNative("some", context, elementValue, i, WrappedInstance)) == true)
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Accumulates a single value by calling a user-defined function for each element
/// (starting with the last element in the array).
/// </summary>
/// <param name="callbackFunction"> A user-defined function that is called for each element
/// in the array. This function is called with four arguments: the current accumulated
/// value, the value of the element, the index of the element, and the array that is being
/// operated on. The return value for this function is the new accumulated value and is
/// passed to the next invocation of the function. </param>
/// <param name="initialValue"> The initial accumulated value. </param>
/// <returns> The accumulated value returned from the last invocation of the callback
/// function. </returns>
public object ReduceRight(FunctionInstance callbackFunction, object initialValue)
{
// If an initial value is not provided, the initial value is the last (defined) element.
int i = Length - 1;
object accumulatedValue = initialValue;
if (accumulatedValue == null)
{
// Scan for a defined element.
for (; i >= 0; i--)
{
if (this[i] != null)
{
accumulatedValue = this[i--];
break;
}
}
if (accumulatedValue == null)
{
throw new JavaScriptException(ErrorType.TypeError, "Reduce of empty array with no initial value");
}
}
// Scan from high to to low.
for (; i >= 0; i--)
{
// Get the value of the array element.
object elementValue = this[i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
accumulatedValue = callbackFunction.CallFromNative("reduceRight", Undefined.Value, accumulatedValue, elementValue, i, WrappedInstance);
}
}
return(accumulatedValue);
}
/// <summary>
/// Returns a copy of this string with text replaced using a replacement function.
/// </summary>
/// <param name="thisObject"> The string that is being operated on. </param>
/// <param name="substr"> The text to search for. </param>
/// <param name="replaceFunction"> A function that is called to produce the text to replace
/// for every successful match. </param>
/// <returns> A copy of this string with text replaced. </returns>
public static string Replace(string thisObject, string substr, FunctionInstance replaceFunction)
{
// Find the first occurrance of substr.
int start = thisObject.IndexOf(substr, StringComparison.Ordinal);
if (start == -1)
{
return(thisObject);
}
int end = start + substr.Length;
// Get the replacement text from the provided function.
var replaceText = TypeConverter.ToString(replaceFunction.CallFromNative("replace", null, substr, start, thisObject));
// Replace only the first match.
var result = new System.Text.StringBuilder(thisObject.Length + (replaceText.Length - substr.Length));
result.Append(thisObject, 0, start);
result.Append(replaceText);
result.Append(thisObject, end, thisObject.Length - end);
return(result.ToString());
}
/// <summary>
/// Returns an index in the typed array, if an element in the typed array satisfies the
/// provided testing function. Otherwise -1 is returned.
/// </summary>
/// <param name="callbackFunction"> A user-defined function that is called for each element in the
/// array. This function is called with three arguments: the value of the element, the
/// index of the element, and the array that is being operated on. The function should
/// return <c>true</c> or <c>false</c>. </param>
/// <param name="context"> The value of <c>this</c> in the context of the callback function. </param>
/// <returns> The first element that results in the callback returning <c>true</c>. </returns>
public int FindIndex(FunctionInstance callbackFunction, ObjectInstance context)
{
for (int i = 0; i < Length; i++)
{
// Get the value of the array element.
object elementValue = this[i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
bool result = TypeConverter.ToBoolean(callbackFunction.CallFromNative("findIndex", context, elementValue, i, WrappedInstance));
// Return if the result was true.
if (result == true)
{
return(i);
}
}
}
// No matches, return undefined.
return(-1);
}
/// <summary>
/// Creates a new array with the results of calling the given function on every element in
/// this array.
/// </summary>
/// <param name="callbackFunction"> A user-defined function that is called for each element
/// in the array. This function is called with three arguments: the value of the element,
/// the index of the element, and the array that is being operated on. The value that is
/// returned from this function is stored in the resulting array. </param>
/// <param name="context"> The value of <c>this</c> in the context of the callback function. </param>
/// <returns> A new array with the results of calling the given function on every element
/// in the array. </returns>
public ObjectInstance Map(FunctionInstance callbackFunction, ObjectInstance context)
{
// Create a new array to hold the new values.
// The length of the output array is always equal to the length of the input array.
var resultArray = new T[Length];
for (int i = 0; i < Length; i++)
{
// Get the value of the array element.
object elementValue = this[i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
object result = callbackFunction.CallFromNative("map", context, elementValue, i, WrappedInstance);
// Store the result.
resultArray[i] = ConvertValue(result);
}
}
return(ConstructArray(resultArray));
}
/// <summary>
/// Returns a copy of the given string with text replaced using a regular expression.
/// </summary>
/// <param name="input"> The string on which to perform the search. </param>
/// <param name="replaceFunction"> A function that is called to produce the text to replace
/// for every successful match. </param>
/// <returns> A copy of the given string with text replaced using a regular expression. </returns>
public string Replace(string input, FunctionInstance replaceFunction)
{
return(this.value.Replace(input, match =>
{
// Set the deprecated RegExp properties.
this.Engine.RegExp.SetDeprecatedProperties(input, match);
object[] parameters = new object[match.Groups.Count + 2];
for (int i = 0; i < match.Groups.Count; i++)
{
if (match.Groups[i].Success == false)
{
parameters[i] = Undefined.Value;
}
else
{
parameters[i] = match.Groups[i].Value;
}
}
parameters[match.Groups.Count] = match.Index;
parameters[match.Groups.Count + 1] = input;
return TypeConverter.ToString(replaceFunction.CallFromNative("replace", null, parameters));
}, this.Global == true ? int.MaxValue : 1));
}
/// <summary>
/// Returns a copy of this string with text replaced using a replacement function.
/// </summary>
/// <param name="substr"> The text to search for. </param>
/// <param name="replaceFunction"> A function that is called to produce the text to replace
/// for every successful match. </param>
/// <returns> A copy of this string with text replaced. </returns>
public static string Replace(string thisObject, string substr, FunctionInstance replaceFunction)
{
// Find the first occurrance of substr.
int start = thisObject.IndexOf(substr, StringComparison.Ordinal);
if (start == -1)
return thisObject;
int end = start + substr.Length;
// Get the replacement text from the provided function.
var replaceText = TypeConverter.ToString(replaceFunction.CallFromNative("replace", null, substr, start, thisObject));
// Replace only the first match.
var result = new System.Text.StringBuilder(thisObject.Length + (replaceText.Length - substr.Length));
result.Append(thisObject, 0, start);
result.Append(replaceText);
result.Append(thisObject, end, thisObject.Length - end);
return result.ToString();
}
public static object ReduceRight(ObjectInstance thisObj, FunctionInstance callbackFunction, [DefaultParameterValue(null)] object initialValue = null)
{
// callbackFunction must be a valid function.
if (callbackFunction == null)
throw new JavaScriptException(thisObj.Engine, "TypeError", "Invalid callback function");
// Get the length of the array.
uint arrayLength = GetLength(thisObj);
// This method only supports arrays of length up to 2^31-1.
if (arrayLength > int.MaxValue)
throw new JavaScriptException(thisObj.Engine, "RangeError", "The array is too long");
// If an initial value is not provided, the initial value is the last (defined) element.
int i = (int)arrayLength - 1;
object accumulatedValue = initialValue;
if (accumulatedValue == null)
{
// Scan for a defined element.
for (; i >= 0; i--)
{
if (thisObj[(uint)i] != null)
{
accumulatedValue = thisObj[(uint)(i--)];
break;
}
}
if (accumulatedValue == null)
throw new JavaScriptException(thisObj.Engine, "TypeError", "Reduce of empty array with no initial value");
}
// Scan from high to to low.
for (; i >= 0; i--)
{
// Get the value of the array element.
object elementValue = thisObj[(uint)i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
accumulatedValue = callbackFunction.CallFromNative("reduceRight", Undefined.Value, accumulatedValue, elementValue, i, thisObj);
}
}
return accumulatedValue;
}
public static ArrayInstance Filter(ObjectInstance thisObj, FunctionInstance callbackFunction, [DefaultParameterValue(null)] ObjectInstance context = null)
{
// callbackFunction must be a valid function.
if (callbackFunction == null)
throw new JavaScriptException(thisObj.Engine, "TypeError", "Invalid callback function");
// Get the length of the array.
uint arrayLength = GetLength(thisObj);
// This method only supports arrays of length up to 2^31-1.
if (arrayLength > int.MaxValue)
throw new JavaScriptException(thisObj.Engine, "RangeError", "The array is too long");
// Create a new array to hold the new values.
var result = thisObj.Engine.Array.New();
for (int i = 0; i < arrayLength; i++)
{
// Get the value of the array element.
object elementValue = thisObj[(uint)i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
bool includeInArray = TypeConverter.ToBoolean(callbackFunction.CallFromNative("filter", context, elementValue, i, thisObj));
// Store the result if the callback function returned true.
if (includeInArray == true)
result.Push(elementValue);
}
}
return result;
}
public static ArrayInstance Map(ObjectInstance thisObj, FunctionInstance callbackFunction, [DefaultParameterValue(null)] ObjectInstance context = null)
{
// callbackFunction must be a valid function.
if (callbackFunction == null)
throw new JavaScriptException(thisObj.Engine, "TypeError", "Invalid callback function");
// Get the length of the array.
uint arrayLength = GetLength(thisObj);
// This method only supports arrays of length up to 2^31-1.
if (arrayLength > int.MaxValue)
throw new JavaScriptException(thisObj.Engine, "RangeError", "The array is too long");
// Create a new array to hold the new values.
// The length of the output array is always equal to the length of the input array.
var resultArray = new ArrayInstance(thisObj.Engine.Array.InstancePrototype, arrayLength, arrayLength);
for (int i = 0; i < arrayLength; i++)
{
// Get the value of the array element.
object elementValue = thisObj[(uint)i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
object result = callbackFunction.CallFromNative("map", context, elementValue, i, thisObj);
// Store the result.
resultArray[(uint)i] = result;
}
}
return resultArray;
}
public static void ForEach(ObjectInstance thisObj, FunctionInstance callbackFunction, [DefaultParameterValue(null)] ObjectInstance context = null)
{
// callbackFunction must be a valid function.
if (callbackFunction == null)
throw new JavaScriptException(thisObj.Engine, "TypeError", "Invalid callback function");
// Get the length of the array.
uint arrayLength = GetLength(thisObj);
// This method only supports arrays of length up to 2^31-1.
if (arrayLength > int.MaxValue)
throw new JavaScriptException(thisObj.Engine, "RangeError", "The array is too long");
for (int i = 0; i < arrayLength; i++)
{
// Get the value of the array element.
object elementValue = thisObj[(uint)i];
// Only call the callback function for array elements that exist in the array.
if (elementValue != null)
{
// Call the callback function.
callbackFunction.CallFromNative("forEach", context, elementValue, i, thisObj);
}
}
}
/// <summary>
/// Returns a copy of the given string with text replaced using a regular expression.
/// </summary>
/// <param name="input"> The string on which to perform the search. </param>
/// <param name="replaceFunction"> A function that is called to produce the text to replace
/// for every successful match. </param>
/// <returns> A copy of the given string with text replaced using a regular expression. </returns>
public string Replace(string input, FunctionInstance replaceFunction)
{
return this.value.Replace(input, match =>
{
// Set the deprecated RegExp properties.
this.Engine.RegExp.SetDeprecatedProperties(input, match);
object[] parameters = new object[match.Groups.Count + 2];
for (int i = 0; i < match.Groups.Count; i++)
{
if (match.Groups[i].Success == false)
parameters[i] = Undefined.Value;
else
parameters[i] = match.Groups[i].Value;
}
parameters[match.Groups.Count] = match.Index;
parameters[match.Groups.Count + 1] = input;
return TypeConverter.ToString(replaceFunction.CallFromNative("replace", null, parameters));
}, this.Global == true ? int.MaxValue : 1);
}
