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Diffstat (limited to 'util/qlalr/examples/qparser/qparser.h')
| -rw-r--r-- | util/qlalr/examples/qparser/qparser.h | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/util/qlalr/examples/qparser/qparser.h b/util/qlalr/examples/qparser/qparser.h deleted file mode 100644 index a5678d0c33..0000000000 --- a/util/qlalr/examples/qparser/qparser.h +++ /dev/null @@ -1,152 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). -** Contact: http://www.qt-project.org/legal -** -** This file is part of the QLALR module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and Digia. For licensing terms and -** conditions see http://qt.digia.com/licensing. For further information -** use the contact form at http://qt.digia.com/contact-us. -** -** GNU Lesser General Public License Usage -** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 2.1 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 2.1 requirements -** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. -** -** In addition, as a special exception, Digia gives you certain additional -** rights. These rights are described in the Digia Qt LGPL Exception -** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 3.0 as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL included in the -** packaging of this file. Please review the following information to -** ensure the GNU General Public License version 3.0 requirements will be -** met: http://www.gnu.org/copyleft/gpl.html. -** -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#ifndef QPARSER_H -#define QPARSER_H - -#include <QtCore/QSharedDataPointer> -#include <QtCore/QVarLengthArray> - -template <typename _Parser, typename _Table, typename _Value = int> -class QParser: protected _Table -{ -public: - QParser(); - ~QParser(); - - bool parse(); - - inline _Value &sym(int index); - -private: - inline int nextToken() - { - return static_cast<_Parser*> (this)->nextToken(); - } - - inline void consumeRule(int rule) - { - static_cast<_Parser*> (this)->consumeRule(rule); - } - - enum { DefaultStackSize = 128 }; - - struct Data: public QSharedData - { - Data(): stackSize (DefaultStackSize), tos (0) {} - - QVarLengthArray<int, DefaultStackSize> stateStack; - QVarLengthArray<_Value, DefaultStackSize> parseStack; - int stackSize; - int tos; - - void reallocateStack() { - stackSize <<= 1; - stateStack.resize(stackSize); - parseStack.resize(stackSize); - } - }; - - QSharedDataPointer<Data> d; -}; - -template <typename _Parser, typename _Table, typename _Value> -inline _Value &QParser<_Parser, _Table, _Value>::sym(int n) -{ - return d->parseStack [d->tos + n - 1]; -} - -template <typename _Parser, typename _Table, typename _Value> -QParser<_Parser, _Table, _Value>::QParser(): - d(new Data()) -{ -} - -template <typename _Parser, typename _Table, typename _Value> -QParser<_Parser, _Table, _Value>::~QParser() -{ -} - -template <typename _Parser, typename _Table, typename _Value> -bool QParser<_Parser, _Table, _Value>::parse() -{ - const int INITIAL_STATE = 0; - - d->tos = 0; - d->reallocateStack(); - - int act = d->stateStack[++d->tos] = INITIAL_STATE; - int token = -1; - - forever { - if (token == -1 && - _Table::TERMINAL_COUNT != _Table::action_index[act]) - token = nextToken(); - - act = _Table::t_action(act, token); - - if (d->stateStack[d->tos] == _Table::ACCEPT_STATE) - return true; - - else if (act > 0) { - if (++d->tos == d->stackSize) - d->reallocateStack(); - - d->parseStack[d->tos] = d->parseStack[d->tos - 1]; - d->stateStack[d->tos] = act; - token = -1; - } - - else if (act < 0) { - int r = - act - 1; - d->tos -= _Table::rhs[r]; - act = d->stateStack[d->tos++]; - consumeRule(r); - act = d->stateStack[d->tos] = _Table::nt_action(act, _Table::lhs[r] - _Table::TERMINAL_COUNT); - } - - else break; - } - - return false; -} - - -#endif // QPARSER_H |