summaryrefslogtreecommitdiffstats
path: root/util/qlalr/examples/dummy-xml/ll/dummy-xml-ll.cpp
blob: 56f0e4f1e164de9eb63a46894718c405334169e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QLALR module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include <cstdlib>
#include <cstdio>

enum Token {
    EOF_SYMBOL,
    LEFT_ANGLE,
    RIGHT_ANGLE,
    ANY,
};

static int current_char;
static int yytoken;
static bool in_tag = false;

bool parseXmlStream();
bool parseTagOrWord();
bool parseTagName();

inline int nextToken()
{
    current_char = fgetc(stdin);
    if (current_char == EOF) {
        return (yytoken = EOF_SYMBOL);
    } else if (current_char == '<') {
        in_tag = true;
        return (yytoken = LEFT_ANGLE);
    } else if (in_tag && current_char == '>') {
        in_tag = false;
        return (yytoken = RIGHT_ANGLE);
    }
    return (yytoken = ANY);
}

bool parse()
{
    nextToken();
    return parseXmlStream();
}

bool parseXmlStream()
{
    while (parseTagOrWord())
        ;

    return true;
}

bool parseTagOrWord()
{
    if (yytoken == LEFT_ANGLE) {
        nextToken();
        if (! parseTagName())
            return false;
        if (yytoken != RIGHT_ANGLE)
            return false;
        nextToken();

        fprintf (stderr, "*** found a tag\n");

    } else if (yytoken == ANY) {
        nextToken();
    } else {
        return false;
    }
    return true;
}

bool parseTagName()
{
    while (yytoken == ANY)
        nextToken();

    return true;
}

int main()
{
    if (parse())
        printf("OK\n");
    else
        printf("KO\n");
}