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/*
* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.nashorn.internal.objects;
import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
import java.util.List;
import jdk.nashorn.internal.objects.annotations.Attribute;
import jdk.nashorn.internal.objects.annotations.Constructor;
import jdk.nashorn.internal.objects.annotations.Function;
import jdk.nashorn.internal.objects.annotations.ScriptClass;
import jdk.nashorn.internal.runtime.JSType;
import jdk.nashorn.internal.runtime.ScriptFunction;
import jdk.nashorn.internal.runtime.ScriptObject;
import jdk.nashorn.internal.runtime.ScriptRuntime;
/**
* ECMA 15.3 Function Objects
*
* Note: instances of this class are never created. This class is not even a
* subclass of ScriptObject. But, we use this class to generate prototype and
* constructor for "Function".
*/
@ScriptClass("Function")
public final class NativeFunction {
// do *not* create me!
private NativeFunction() {
}
/**
* ECMA 15.3.4.2 Function.prototype.toString ( )
*
* @param self self reference
* @return string representation of Function
*/
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static Object toString(final Object self) {
if (!(self instanceof ScriptFunction)) {
throw typeError("not.a.function", ScriptRuntime.safeToString(self));
}
return ((ScriptFunction)self).toSource();
}
/**
* ECMA 15.3.4.3 Function.prototype.apply (thisArg, argArray)
*
* @param self self reference
* @param thiz {@code this} arg for apply
* @param array array of argument for apply
* @return result of apply
*/
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static Object apply(final Object self, final Object thiz, final Object array) {
if (!(self instanceof ScriptFunction)) {
throw typeError("not.a.function", ScriptRuntime.safeToString(self));
}
Object[] args = null;
if (array instanceof ScriptObject) {
// look for array-like object
final ScriptObject sobj = (ScriptObject)array;
final Object len = sobj.getLength();
final int n = (int)JSType.toUint32(len);
args = new Object[n];
for (int i = 0; i < args.length; i++) {
args[i] = sobj.get(i);
}
} else if (array instanceof Object[]) {
args = (Object[])array;
} else if (array instanceof List) {
final List<?> list = (List<?>)array;
list.toArray(args = new Object[list.size()]);
} else if (array == null || array == UNDEFINED) {
args = ScriptRuntime.EMPTY_ARRAY;
} else {
throw typeError("function.apply.expects.array");
}
return ScriptRuntime.apply((ScriptFunction)self, thiz, args);
}
/**
* ECMA 15.3.4.4 Function.prototype.call (thisArg [ , arg1 [ , arg2, ... ] ] )
*
* @param self self reference
* @param args arguments for call
* @return result of call
*/
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static Object call(final Object self, final Object... args) {
if (!(self instanceof ScriptFunction)) {
throw typeError("not.a.function", ScriptRuntime.safeToString(self));
}
Object thiz = (args.length == 0) ? UNDEFINED : args[0];
Object[] arguments;
if (args.length > 1) {
arguments = new Object[args.length - 1];
System.arraycopy(args, 1, arguments, 0, arguments.length);
} else {
arguments = ScriptRuntime.EMPTY_ARRAY;
}
return ScriptRuntime.apply((ScriptFunction)self, thiz, arguments);
}
/**
* ECMA 15.3.4.5 Function.prototype.bind (thisArg [, arg1 [, arg2, ...]])
*
* @param self self reference
* @param args arguments for bind
* @return function with bound arguments
*/
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static Object bind(final Object self, final Object... args) {
if (!(self instanceof ScriptFunction)) {
throw typeError("not.a.function", ScriptRuntime.safeToString(self));
}
final Object thiz = (args.length == 0) ? UNDEFINED : args[0];
Object[] arguments;
if (args.length > 1) {
arguments = new Object[args.length - 1];
System.arraycopy(args, 1, arguments, 0, arguments.length);
} else {
arguments = ScriptRuntime.EMPTY_ARRAY;
}
return ((ScriptFunctionImpl)self).makeBoundFunction(thiz, arguments);
}
/**
* Nashorn extension: Function.prototype.toSource
*
* @param self self reference
* @return source for function
*/
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static Object toSource(final Object self) {
if (!(self instanceof ScriptFunction)) {
throw typeError("not.a.function", ScriptRuntime.safeToString(self));
}
return ((ScriptFunction)self).toSource();
}
/**
* ECMA 15.3.2.1 new Function (p1, p2, ... , pn, body)
*
* Constructor
*
* @param newObj is the new operator used for constructing this function
* @param self self reference
* @param args arguments
* @return new NativeFunction
*/
@Constructor(arity = 1)
public static Object function(final boolean newObj, final Object self, final Object... args) {
final StringBuilder sb = new StringBuilder();
sb.append("(function (");
if (args.length > 0) {
for (int i = 0; i < args.length - 1; i++) {
sb.append(JSType.toString(args[i]));
if (i < args.length - 2) {
sb.append(",");
}
}
}
sb.append(") {\n");
if (args.length > 0) {
sb.append(JSType.toString(args[args.length - 1]));
sb.append('\n');
}
sb.append("})");
final Global global = Global.instance();
return Global.directEval(global, sb.toString(), global, "<function>", Global.isStrict());
}
}
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