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-/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- *
- * ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * Contributor(s):
- * Norris Boyd
- *
- * Alternatively, the contents of this file may be used under the terms of
- * the GNU General Public License Version 2 or later (the "GPL"), in which
- * case the provisions of the GPL are applicable instead of those above. If
- * you wish to allow use of your version of this file only under the terms of
- * the GPL and not to allow others to use your version of this file under the
- * MPL, indicate your decision by deleting the provisions above and replacing
- * them with the notice and other provisions required by the GPL. If you do
- * not delete the provisions above, a recipient may use your version of this
- * file under either the MPL or the GPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-package org.mozilla.javascript;
-
-import java.util.Iterator;
-
-/**
- * This class implements iterator objects. See
- * http://developer.mozilla.org/en/docs/New_in_JavaScript_1.7#Iterators
- *
- * @author Norris Boyd
- */
-public final class NativeIterator extends IdScriptableObject {
- private static final Object ITERATOR_TAG = new Object();
-
- static void init(ScriptableObject scope, boolean sealed) {
- // Iterator
- NativeIterator iterator = new NativeIterator();
- iterator.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
-
- // Generator
- NativeGenerator.init(scope, sealed);
-
- // StopIteration
- NativeObject obj = new StopIteration();
- obj.setPrototype(getObjectPrototype(scope));
- obj.setParentScope(scope);
- if (sealed) { obj.sealObject(); }
- ScriptableObject.defineProperty(scope, STOP_ITERATION, obj,
- ScriptableObject.DONTENUM);
- // Use "associateValue" so that generators can continue to
- // throw StopIteration even if the property of the global
- // scope is replaced or deleted.
- scope.associateValue(ITERATOR_TAG, obj);
- }
-
- /**
- * Only for constructing the prototype object.
- */
- private NativeIterator() {
- }
-
- private NativeIterator(Object objectIterator) {
- this.objectIterator = objectIterator;
- }
-
- /**
- * Get the value of the "StopIteration" object. Note that this value
- * is stored in the top-level scope using "associateValue" so the
- * value can still be found even if a script overwrites or deletes
- * the global "StopIteration" property.
- * @param scope a scope whose parent chain reaches a top-level scope
- * @return the StopIteration object
- */
- public static Object getStopIterationObject(Scriptable scope) {
- Scriptable top = ScriptableObject.getTopLevelScope(scope);
- return ScriptableObject.getTopScopeValue(top, ITERATOR_TAG);
- }
-
- private static final String STOP_ITERATION = "StopIteration";
- public static final String ITERATOR_PROPERTY_NAME = "__iterator__";
-
- static class StopIteration extends NativeObject {
- public String getClassName() {
- return STOP_ITERATION;
- }
-
- /* StopIteration has custom instanceof behavior since it
- * doesn't have a constructor.
- */
- public boolean hasInstance(Scriptable instance) {
- return instance instanceof StopIteration;
- }
- }
-
- public String getClassName() {
- return "Iterator";
- }
-
- protected void initPrototypeId(int id) {
- String s;
- int arity;
- switch (id) {
- case Id_constructor: arity=2; s="constructor"; break;
- case Id_next: arity=0; s="next"; break;
- case Id___iterator__: arity=1; s=ITERATOR_PROPERTY_NAME; break;
- default: throw new IllegalArgumentException(String.valueOf(id));
- }
- initPrototypeMethod(ITERATOR_TAG, id, s, arity);
- }
-
- public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
- Scriptable thisObj, Object[] args)
- {
- if (!f.hasTag(ITERATOR_TAG)) {
- return super.execIdCall(f, cx, scope, thisObj, args);
- }
- int id = f.methodId();
-
- if (id == Id_constructor) {
- return jsConstructor(cx, scope, thisObj, args);
- }
-
- if (!(thisObj instanceof NativeIterator))
- throw incompatibleCallError(f);
-
- NativeIterator iterator = (NativeIterator) thisObj;
-
- switch (id) {
-
- case Id_next:
- return iterator.next(cx, scope);
-
- case Id___iterator__:
- /// XXX: what about argument? SpiderMonkey apparently ignores it
- return thisObj;
-
- default:
- throw new IllegalArgumentException(String.valueOf(id));
- }
- }
-
- /* the javascript constructor */
- private static Object jsConstructor(Context cx, Scriptable scope,
- Scriptable thisObj, Object[] args)
- {
- if (args.length == 0 || args[0] == null ||
- args[0] == Undefined.instance)
- {
- throw ScriptRuntime.typeError1("msg.no.properties",
- ScriptRuntime.toString(args[0]));
- }
- Scriptable obj = ScriptRuntime.toObject(scope, args[0]);
- boolean keyOnly = args.length > 1 && ScriptRuntime.toBoolean(args[1]);
- if (thisObj != null) {
- // Called as a function. Convert to iterator if possible.
-
- // For objects that implement java.lang.Iterable or
- // java.util.Iterator, have JavaScript Iterator call the underlying
- // iteration methods
- Iterator iterator =
- VMBridge.instance.getJavaIterator(cx, scope, obj);
- if (iterator != null) {
- scope = ScriptableObject.getTopLevelScope(scope);
- return cx.getWrapFactory().wrap(cx, scope,
- new WrappedJavaIterator(iterator, scope),
- WrappedJavaIterator.class);
- }
-
- // Otherwise, just call the runtime routine
- Scriptable jsIterator = ScriptRuntime.toIterator(cx, scope, obj,
- keyOnly);
- if (jsIterator != null) {
- return jsIterator;
- }
- }
-
- // Otherwise, just set up to iterate over the properties of the object.
- // Do not call __iterator__ method.
- Object objectIterator = ScriptRuntime.enumInit(obj, cx,
- keyOnly ? ScriptRuntime.ENUMERATE_KEYS_NO_ITERATOR
- : ScriptRuntime.ENUMERATE_ARRAY_NO_ITERATOR);
- ScriptRuntime.setEnumNumbers(objectIterator, true);
- NativeIterator result = new NativeIterator(objectIterator);
- result.setPrototype(NativeIterator.getClassPrototype(scope,
- result.getClassName()));
- result.setParentScope(scope);
- return result;
- }
-
- private Object next(Context cx, Scriptable scope) {
- Boolean b = ScriptRuntime.enumNext(this.objectIterator);
- if (!b.booleanValue()) {
- // Out of values. Throw StopIteration.
- throw new JavaScriptException(
- NativeIterator.getStopIterationObject(scope), null, 0);
- }
- return ScriptRuntime.enumId(this.objectIterator, cx);
- }
-
- static public class WrappedJavaIterator
- {
- WrappedJavaIterator(Iterator iterator, Scriptable scope) {
- this.iterator = iterator;
- this.scope = scope;
- }
-
- public Object next() {
- if (!iterator.hasNext()) {
- // Out of values. Throw StopIteration.
- throw new JavaScriptException(
- NativeIterator.getStopIterationObject(scope), null, 0);
- }
- return iterator.next();
- }
-
- public Object __iterator__(boolean b) {
- return this;
- }
-
- private Iterator iterator;
- private Scriptable scope;
- }
-
-// #string_id_map#
-
- protected int findPrototypeId(String s) {
- int id;
-// #generated# Last update: 2007-06-11 09:43:19 EDT
- L0: { id = 0; String X = null;
- int s_length = s.length();
- if (s_length==4) { X="next";id=Id_next; }
- else if (s_length==11) { X="constructor";id=Id_constructor; }
- else if (s_length==12) { X="__iterator__";id=Id___iterator__; }
- if (X!=null && X!=s && !X.equals(s)) id = 0;
- break L0;
- }
-// #/generated#
- return id;
- }
-
- private static final int
- Id_constructor = 1,
- Id_next = 2,
- Id___iterator__ = 3,
- MAX_PROTOTYPE_ID = 3;
-
-// #/string_id_map#
-
- private Object objectIterator;
-}
-
generated by cgit v1.2.3-1-g7c22 (git 2.25.1) at 2024-06-27 21:25:53 +0000