1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2010 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 QtScript module of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL-ONLY$

    10 ** GNU Lesser General Public License Usage

    11 ** This file may be used under the terms of the GNU Lesser

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

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

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

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

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

    17 **

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

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

    20 ** $QT_END_LICENSE$

    21 **

    22 ****************************************************************************/

    23 

    24 #ifndef QSCRIPTSYNTAXCHECKER_H

    25 #define QSCRIPTSYNTAXCHECKER_H

    26 

    27 //

    28 //  W A R N I N G

    29 //  -------------

    30 //

    31 // This file is not part of the Qt API.  It exists purely as an

    32 // implementation detail.  This header file may change from version to

    33 // version without notice, or even be removed.

    34 //

    35 // We mean it.

    36 //

    37 

    38 #include <QtCore/qstring.h>

    39 

    40 #include "qscriptgrammar_p.h"

    41 

    42 QT_BEGIN_NAMESPACE

    43 

    44 namespace QScript {

    45 

    46 class Lexer;

    47 

    48 class SyntaxChecker: protected QScriptGrammar

    49 {

    50 public:

    51     enum State {

    52         Error,

    53         Intermediate,

    54         Valid,

    55     };

    56 

    57     struct Result {

    58         Result(State s, int ln, int col, const QString &msg)

    59             : state(s), errorLineNumber(ln), errorColumnNumber(col),

    60               errorMessage(msg) {}

    61         State state;

    62         int errorLineNumber;

    63         int errorColumnNumber;

    64         QString errorMessage;

    65     };

    66 

    67     SyntaxChecker();

    68     ~SyntaxChecker();

    69 

    70     Result checkSyntax(const QString &code);

    71 

    72 protected:

    73     bool automatic(QScript::Lexer *lexer, int token) const;

    74     inline void reallocateStack();

    75 

    76 protected:

    77     int tos;

    78     int stack_size;

    79     int *state_stack;

    80 };

    81 

    82 inline void SyntaxChecker::reallocateStack()

    83 {

    84     if (! stack_size)

    85         stack_size = 128;

    86     else

    87         stack_size <<= 1;

    88 

    89     state_stack = reinterpret_cast<int*> (qRealloc(state_stack, stack_size * sizeof(int)));

    90 }

    91 

    92 } // namespace QScript

    93 

    94 QT_END_NAMESPACE

    95 

    96 #endif