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+/****************************************************************************
+**
+** 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "lambda.h"
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include "parser_table_p.h"
+
+class Parser: protected parser_table
+{
+public:
+ union Value {
+ int ival;
+ // ### more...
+ };
+
+public:
+ Parser();
+ ~Parser();
+
+ bool parse();
+
+protected:
+ inline void reallocateStack();
+
+ inline Value &sym(int index)
+ { return sym_stack [tos + index - 1]; }
+
+ int nextToken();
+ void consumeRule(int ruleno);
+
+protected:
+ int tos;
+ int stack_size;
+ Value *sym_stack;
+ int *state_stack;
+ int current_char;
+ unsigned in_tag: 1;
+};
+
+inline void Parser::reallocateStack()
+{
+ if (! stack_size)
+ stack_size = 128;
+ else
+ stack_size <<= 1;
+
+ sym_stack = reinterpret_cast<Value*> (::realloc(sym_stack, stack_size * sizeof(Value)));
+ state_stack = reinterpret_cast<int*> (::realloc(state_stack, stack_size * sizeof(int)));
+}
+
+Parser::Parser():
+ tos(0),
+ stack_size(0),
+ sym_stack(0),
+ state_stack(0)
+{
+}
+
+Parser::~Parser()
+{
+ if (stack_size) {
+ ::free(sym_stack);
+ ::free(state_stack);
+ }
+}
+
+bool Parser::parse()
+{
+ const int INITIAL_STATE = 0;
+
+ current_char = 0;
+ in_tag = 0;
+
+ int yytoken = -1;
+ reallocateStack();
+
+ tos = 0;
+ state_stack[++tos] = INITIAL_STATE;
+
+ while (true)
+ {
+ if (yytoken == -1 && - TERMINAL_COUNT != action_index [state_stack [tos]])
+ yytoken = nextToken();
+
+ int act = t_action (state_stack [tos], yytoken);
+
+ if (act == ACCEPT_STATE) {
+ return true;
+ }
+
+ else if (act > 0)
+ {
+ if (++tos == stack_size)
+ reallocateStack();
+
+ sym_stack [tos].ival = current_char; // ### save the token value here
+ state_stack [tos] = act;
+ yytoken = -1;
+ }
+
+ else if (act < 0)
+ {
+ int r = - act - 1;
+
+ tos -= rhs [r];
+ act = state_stack [tos++];
+ consumeRule (r);
+ state_stack [tos] = nt_action (act, lhs [r] - TERMINAL_COUNT);
+ }
+
+ else
+ break;
+ }
+
+ return false;
+}
+
+
+int Parser::nextToken()
+{
+ static int tokens[] = { ID, ID, ID, EOF_SYMBOL };
+ static int *tk = tokens;
+
+ return *tk++;
+}
+
+void Parser::consumeRule(int ruleno)
+{
+ switch (ruleno) {
+ case Symbol:
+ printf("symbol\n");
+ break;
+ case SubExpression:
+ printf("sub-expr\n");
+ break;
+ case Appl:
+ printf("appl\n");
+ break;
+ case Abstr:
+ printf("abstr\n");
+ break;
+ }
+}
+
+/////////////////////////////
+// entry point
+/////////////////////////////
+int main()
+{
+ Parser parser;
+
+ if (parser.parse())
+ printf ("OK\n");
+ else
+ printf ("KO\n");
+}
+
+