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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the QLALR module of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

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    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

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    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include <cstdlib>

    43 #include <cstdio>

    44 

    45 enum Token {

    46     EOF_SYMBOL,

    47     LEFT_ANGLE,

    48     RIGHT_ANGLE,

    49     ANY,

    50 };

    51 

    52 static int current_char;

    53 static int yytoken;

    54 static bool in_tag = false;

    55 

    56 bool parseXmlStream();

    57 bool parseTagOrWord();

    58 bool parseTagName();

    59 

    60 inline int nextToken()

    61 {

    62     current_char = fgetc(stdin);

    63     if (current_char == EOF) {

    64         return (yytoken = EOF_SYMBOL);

    65     } else if (current_char == '<') {

    66         in_tag = true;

    67         return (yytoken = LEFT_ANGLE);

    68     } else if (in_tag && current_char == '>') {

    69         in_tag = false;

    70         return (yytoken = RIGHT_ANGLE);

    71     }

    72     return (yytoken = ANY);

    73 }

    74 

    75 bool parse()

    76 {

    77     nextToken();

    78     return parseXmlStream();

    79 }

    80 

    81 bool parseXmlStream()

    82 {

    83     while (parseTagOrWord())

    84         ;

    85 

    86     return true;

    87 }

    88 

    89 bool parseTagOrWord()

    90 {

    91     if (yytoken == LEFT_ANGLE) {

    92         nextToken();

    93         if (! parseTagName())

    94             return false;

    95         if (yytoken != RIGHT_ANGLE)

    96             return false;

    97         nextToken();

    98 

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

   100 

   101     } else if (yytoken == ANY) {

   102         nextToken();

   103     } else {

   104         return false;

   105     }

   106     return true;

   107 }

   108 

   109 bool parseTagName()

   110 {

   111     while (yytoken == ANY)

   112         nextToken();

   113 

   114     return true;

   115 }

   116 

   117 int main()

   118 {

   119     if (parse())

   120         printf("OK\n");

   121     else

   122         printf("KO\n");

   123 }