1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QLALR project on Qt Labs.
7**
8** $QT_BEGIN_LICENSE:GPL-EXCEPT$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU
19** General Public License version 3 as published by the Free Software
20** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
21** included in the packaging of this file. Please review the following
22** information to ensure the GNU General Public License requirements will
23** be met: https://www.gnu.org/licenses/gpl-3.0.html.
24**
25** $QT_END_LICENSE$
26**
27****************************************************************************/
28
29#include "grammar_p.h"
30
31#include "lalr.h"
32
33#include <QtCore/qdebug.h>
34#include <QtCore/qstring.h>
35#include <QtCore/qfile.h>
36#include <QtCore/qtextstream.h>
37
38#include <cstdlib>
39
40class Recognizer: protected grammar
41{
42public:
43 Recognizer (Grammar *grammar, bool no_lines);
44 ~Recognizer();
45
46 bool parse (const QString &input_file = QString ());
47
48 inline QString decls () const { return _M_decls; }
49 inline QString impls () const { return _M_impls; }
50
51protected:
52 inline void reallocateStack ();
53
54 inline QString &sym (int index)
55 { return sym_stack [tos + index - 1]; }
56
57protected: // scanner
58 int nextToken();
59
60 inline void inp ()
61 {
62 if (_M_currentChar != _M_lastChar)
63 {
64 ch = *_M_currentChar++;
65
66 if (ch == QLatin1Char('\n'))
67 ++_M_line;
68 }
69 else
70 ch = QChar();
71 }
72
73 QString expand (const QString &text) const;
74
75protected:
76 // recognizer
77 int tos;
78 int stack_size;
79 QVector<QString> sym_stack;
80 int *state_stack;
81
82 QString _M_contents;
83 QString::const_iterator _M_firstChar;
84 QString::const_iterator _M_lastChar;
85 QString::const_iterator _M_currentChar;
86
87 // scanner
88 QChar ch;
89 int _M_line;
90 int _M_action_line;
91 Grammar *_M_grammar;
92 RulePointer _M_current_rule;
93 QString _M_input_file;
94
95 QString _M_decls;
96 QString _M_impls;
97 QString _M_current_value;
98 bool _M_no_lines;
99};
100

source code of qtbase/src/tools/qlalr/recognizer.h