| /* |
| * Copyright (c) 2016, 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 jdk.nashorn.internal.objects.annotations.Function; |
| import jdk.nashorn.internal.objects.annotations.ScriptClass; |
| import jdk.nashorn.internal.runtime.PropertyMap; |
| import jdk.nashorn.internal.runtime.ScriptRuntime; |
| import jdk.nashorn.internal.runtime.Undefined; |
| |
| import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; |
| |
| /** |
| * ECMA6 21.1.5 String Iterator Objects |
| */ |
| @ScriptClass("StringIterator") |
| public class StringIterator extends AbstractIterator { |
| |
| // initialized by nasgen |
| private static PropertyMap $nasgenmap$; |
| |
| private String iteratedString; |
| private int nextIndex = 0; |
| private final Global global; |
| |
| StringIterator(final String iteratedString, final Global global) { |
| super(global.getStringIteratorPrototype(), $nasgenmap$); |
| this.iteratedString = iteratedString; |
| this.global = global; |
| } |
| |
| /** |
| * ES6 21.1.5.2.1 %StringIteratorPrototype%.next() |
| * |
| * @param self the self reference |
| * @param arg the argument |
| * @return the next result |
| */ |
| @Function |
| public static Object next(final Object self, final Object arg) { |
| if (!(self instanceof StringIterator)) { |
| throw typeError("not.a.string.iterator", ScriptRuntime.safeToString(self)); |
| } |
| return ((StringIterator)self).next(arg); |
| } |
| |
| @Override |
| public String getClassName() { |
| return "String Iterator"; |
| } |
| |
| @Override |
| protected IteratorResult next(final Object arg) { |
| final int index = nextIndex; |
| final String string = iteratedString; |
| |
| if (string == null || index >= string.length()) { |
| // ES6 21.1.5.2.1 step 8 |
| iteratedString = null; |
| return makeResult(Undefined.getUndefined(), Boolean.TRUE, global); |
| } |
| |
| final char first = string.charAt(index); |
| if (first >= 0xd800 && first <= 0xdbff && index < string.length() - 1) { |
| final char second = string.charAt(index + 1); |
| if (second >= 0xdc00 && second <= 0xdfff) { |
| nextIndex += 2; |
| return makeResult(String.valueOf(new char[] {first, second}), Boolean.FALSE, global); |
| } |
| } |
| |
| nextIndex++; |
| return makeResult(String.valueOf(first), Boolean.FALSE, global); |
| } |
| } |