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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 QtXmlPatterns 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 **

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    38 ** $QT_END_LICENSE$

    39 **

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

    41 

    42 #include <QStringList>

    43 

    44 #include "qboolean_p.h"

    45 #include "qcommonvalues_p.h"

    46 #include "qitemmappingiterator_p.h"

    47 #include "qpatternistlocale_p.h"

    48 #include "qatomicstring_p.h"

    49 

    50 #include "qpatternmatchingfns_p.h"

    51 

    52 QT_BEGIN_NAMESPACE

    53 

    54 using namespace QPatternist;

    55 

    56 MatchesFN::MatchesFN() : PatternPlatform(2)

    57 {

    58 }

    59 

    60 Item MatchesFN::evaluateSingleton(const DynamicContext::Ptr &context) const

    61 {

    62     const QRegExp regexp(pattern(context));

    63     QString input;

    64 

    65     const Item arg(m_operands.first()->evaluateSingleton(context));

    66     if(arg)

    67         input = arg.stringValue();

    68 

    69     return Boolean::fromValue(input.contains(regexp));

    70 }

    71 

    72 ReplaceFN::ReplaceFN() : PatternPlatform(3)

    73 {

    74 }

    75 

    76 Item ReplaceFN::evaluateSingleton(const DynamicContext::Ptr &context) const

    77 {

    78     const QRegExp regexp(pattern(context));

    79     QString input;

    80 

    81     const Item arg(m_operands.first()->evaluateSingleton(context));

    82     if(arg)

    83         input = arg.stringValue();

    84 

    85     const QString replacement(m_replacementString.isNull() ? parseReplacement(regexp.numCaptures(), context)

    86                                                            : m_replacementString);

    87 

    88 

    89     return AtomicString::fromValue(input.replace(regexp, replacement));

    90 }

    91 

    92 QString ReplaceFN::errorAtEnd(const char ch)

    93 {

    94     return QtXmlPatterns::tr("%1 must be followed by %2 or %3, not at "

    95                              "the end of the replacement string.")

    96                              .arg(formatKeyword(QLatin1Char(ch)))

    97                              .arg(formatKeyword(QLatin1Char('\\')))

    98                              .arg(formatKeyword(QLatin1Char('$')));

    99 }

   100 

   101 QString ReplaceFN::parseReplacement(const int,

   102                                     const DynamicContext::Ptr &context) const

   103 {

   104     // TODO what if there is no groups, can one rewrite to the replacement then?

   105     const QString input(m_operands.at(2)->evaluateSingleton(context).stringValue());

   106 

   107     QString retval;

   108     retval.reserve(input.size());

   109     const int len = input.length();

   110 

   111     for(int i = 0; i < len; ++i)

   112     {

   113         const QChar ch(input.at(i));

   114         switch(ch.toAscii())

   115         {

   116             case '$':

   117             {

   118                 /* QRegExp uses '\' as opposed to '$' for marking sub groups. */

   119                 retval.append(QLatin1Char('\\'));

   120 

   121                 ++i;

   122                 if(i == len)

   123                 {

   124                     context->error(errorAtEnd('$'), ReportContext::FORX0004, this);

   125                     return QString();

   126                 }

   127 

   128                 const QChar nextCh(input.at(i));

   129                 if(nextCh.isDigit())

   130                     retval.append(nextCh);

   131                 else

   132                 {

   133                     context->error(QtXmlPatterns::tr("In the replacement string, %1 must be "

   134                                                      "followed by at least one digit when not escaped.")

   135                                                      .arg(formatKeyword(QLatin1Char('$'))),

   136                                                 ReportContext::FORX0004, this);

   137                     return QString();

   138                 }

   139 

   140                 break;

   141             }

   142             case '\\':

   143             {

   144                 ++i;

   145                 if(i == len)

   146                 {

   147                     /* error, we've reached the end. */;

   148                     context->error(errorAtEnd('\\'), ReportContext::FORX0004, this);

   149                 }

   150 

   151                 const QChar nextCh(input.at(i));

   152                 if(nextCh == QLatin1Char('\\') || nextCh == QLatin1Char('$'))

   153                 {

   154                     retval.append(ch);

   155                     break;

   156                 }

   157                 else

   158                 {

   159                     context->error(QtXmlPatterns::tr("In the replacement string, %1 can only be used to "

   160                                                      "escape itself or %2, not %3")

   161                                                      .arg(formatKeyword(QLatin1Char('\\')))

   162                                                      .arg(formatKeyword(QLatin1Char('$')))

   163                                                      .arg(formatKeyword(nextCh)),

   164                                                ReportContext::FORX0004, this);

   165                     return QString();

   166                 }

   167             }

   168             default:

   169                 retval.append(ch);

   170         }

   171     }

   172 

   173     return retval;

   174 }

   175 

   176 Expression::Ptr ReplaceFN::compress(const StaticContext::Ptr &context)

   177 {

   178     const Expression::Ptr me(PatternPlatform::compress(context));

   179 

   180     if(me != this)

   181         return me;

   182 

   183     if(m_operands.at(2)->is(IDStringValue))

   184     {

   185         const int capt = captureCount();

   186         if(capt == -1)

   187             return me;

   188         else

   189             m_replacementString = parseReplacement(captureCount(), context->dynamicContext());

   190     }

   191 

   192     return me;

   193 }

   194 

   195 TokenizeFN::TokenizeFN() : PatternPlatform(2)

   196 {

   197 }

   198 

   199 /**

   200  * Used by QAbstractXmlForwardIterator.

   201  */

   202 static inline bool qIsForwardIteratorEnd(const QString &item)

   203 {

   204     return item.isNull();

   205 }

   206 

   207 Item TokenizeFN::mapToItem(const QString &subject, const DynamicContext::Ptr &) const

   208 {

   209     return AtomicString::fromValue(subject);

   210 }

   211 

   212 Item::Iterator::Ptr TokenizeFN::evaluateSequence(const DynamicContext::Ptr &context) const

   213 {

   214     const Item arg(m_operands.first()->evaluateSingleton(context));

   215     if(!arg)

   216         return CommonValues::emptyIterator;

   217 

   218     const QString input(arg.stringValue());

   219     if(input.isEmpty())

   220         return CommonValues::emptyIterator;

   221 

   222     const QRegExp regExp(pattern(context));

   223     const QStringList result(input.split(regExp, QString::KeepEmptyParts));

   224 

   225     return makeItemMappingIterator<Item>(ConstPtr(this),

   226                                          makeListIterator(result),

   227                                          DynamicContext::Ptr());

   228 }

   229 

   230 QT_END_NAMESPACE