projects / apple / javascriptcore.git / blame
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| b37bf2e1 A |
1 | // -*- mode: c++; c-basic-offset: 4 -*- |
| 2 | /* | |
| 3 | * Copyright (C) 1999-2001 Harri Porten (porten@kde.org) | |
| 4 | * Copyright (C) 2001 Peter Kelly (pmk@post.com) | |
| 5 | * Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. | |
| 6 | * | |
| 7 | * This library is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU Library General Public | |
| 9 | * License as published by the Free Software Foundation; either | |
| 10 | * version 2 of the License, or (at your option) any later version. | |
| 11 | * | |
| 12 | * This library is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | * Library General Public License for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU Library General Public License | |
| 18 | * along with this library; see the file COPYING.LIB. If not, write to | |
| 19 | * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
| 20 | * Boston, MA 02110-1301, USA. | |
| 21 | * | |
| 22 | */ | |
| 23 | ||
| 24 | #ifndef KJS_LABEL_STACK_H | |
| 25 | #define KJS_LABEL_STACK_H | |
| 26 | ||
| 27 | #include "identifier.h" | |
| 28 | #include <wtf/Noncopyable.h> | |
| 29 | ||
| 30 | namespace KJS { | |
| 31 | /** | |
| 32 | * @short The "label set" in Ecma-262 spec | |
| 33 | */ | |
| 34 | class LabelStack : Noncopyable { | |
| 35 | public: | |
| 36 | LabelStack() | |
| 37 | : tos(0) | |
| 38 | { | |
| 39 | } | |
| 40 | ~LabelStack(); | |
| 41 | ||
| 42 | /** | |
| 43 | * If id is not empty and is not in the stack already, puts it on top of | |
| 44 | * the stack and returns true, otherwise returns false | |
| 45 | */ | |
| 46 | bool push(const Identifier &id); | |
| 47 | /** | |
| 48 | * Is the id in the stack? | |
| 49 | */ | |
| 50 | bool contains(const Identifier &id) const; | |
| 51 | /** | |
| 52 | * Removes from the stack the last pushed id (what else?) | |
| 53 | */ | |
| 54 | void pop(); | |
| 55 | ||
| 56 | private: | |
| 57 | struct StackElem { | |
| 58 | Identifier id; | |
| 59 | StackElem *prev; | |
| 60 | }; | |
| 61 | ||
| 62 | StackElem *tos; | |
| 63 | }; | |
| 64 | ||
| 65 | inline LabelStack::~LabelStack() | |
| 66 | { | |
| 67 | StackElem *prev; | |
| 68 | for (StackElem *e = tos; e; e = prev) { | |
| 69 | prev = e->prev; | |
| 70 | delete e; | |
| 71 | } | |
| 72 | } | |
| 73 | ||
| 74 | inline void LabelStack::pop() | |
| 75 | { | |
| 76 | if (StackElem *e = tos) { | |
| 77 | tos = e->prev; | |
| 78 | delete e; | |
| 79 | } | |
| 80 | } | |
| 81 | ||
| 82 | } | |
| 83 | ||
| 84 | #endif // KJS_LABEL_STACK_H |