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Diffstat (limited to 'libkdepim/kregexp3.cpp')
| -rw-r--r-- | libkdepim/kregexp3.cpp | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/libkdepim/kregexp3.cpp b/libkdepim/kregexp3.cpp new file mode 100644 index 000000000..a14b446f6 --- /dev/null +++ b/libkdepim/kregexp3.cpp @@ -0,0 +1,183 @@ +/* -*- c++ -*- + kregexp3.cpp + + This file is part of libkdenetwork. + Copyright (c) 2001 Marc Mutz <mutz@kde.org> + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License, + version 2, as published by the Free Software Foundation. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + + In addition, as a special exception, the copyright holders give + permission to link the code of this library with any edition of + the Qt library by Trolltech AS, Norway (or with modified versions + of Qt that use the same license as Qt), and distribute linked + combinations including the two. You must obey the GNU General + Public License in all respects for all of the code used other than + Qt. If you modify this file, you may extend this exception to + your version of the file, but you are not obligated to do so. If + you do not wish to do so, delete this exception statement from + your version. +*/ + +#include "kregexp3.h" + +// #define DEBUG_KREGEXP3 + +#ifdef DEBUG_KREGEXP3 +#include <kdebug.h> +#endif + +QString KRegExp3::replace( const QString & str, + const QString & replacementStr, + int start, bool global ) +{ + int oldpos, pos; + + //-------- parsing the replacementStr into + //-------- literal parts and backreferences: + QStringList literalStrs; + QValueList<int> backRefs; + + // Due to LTS: The regexp in unquoted form and with spaces: + // \\ (\d) | \$ (\d) | \$ \{ (\d+) \} + QRegExp rx( "\\\\(\\d)|\\$(\\d)|\\$\\{(\\d+)\\}" ); + QRegExp bbrx("\\\\"); + QRegExp brx("\\"); + +#ifdef DEBUG_KREGEXP3 + kdDebug() << "Analyzing replacementStr: \"" + replacementStr + "\"" << endl; +#endif + + oldpos = 0; + pos = 0; + while ( true ) { + pos = rx.search( replacementStr, pos ); + +#ifdef DEBUG_KREGEXP3 + kdDebug() << QString(" Found match at pos %1").arg(pos) << endl; +#endif + + if ( pos < 0 ) { + literalStrs << replacementStr.mid( oldpos ) + .replace( bbrx, "\\" ) + .replace( brx, "" ); +#ifdef DEBUG_KREGEXP3 + kdDebug() << " No more matches. Last literal is \"" + literalStrs.last() + "\"" << endl; +#endif + break; + } else { + literalStrs << replacementStr.mid( oldpos, pos-oldpos ) + .replace( bbrx, "\\" ) + .replace( brx, "" ); +#ifdef DEBUG_KREGEXP3 + kdDebug() << QString(" Inserting \"") + literalStrs.last() + "\" as literal." << endl; + kdDebug() << " Searching for corresponding digit(s):" << endl; +#endif + for ( int i = 1 ; i < 4 ; i++ ) + if ( !rx.cap(i).isEmpty() ) { + backRefs << rx.cap(i).toInt(); +#ifdef DEBUG_KREGEXP3 + kdDebug() << QString(" Found %1 at position %2 in the capturedTexts.") + .arg(backRefs.last()).arg(i) << endl; +#endif + break; + } + pos += rx.matchedLength(); +#ifdef DEBUG_KREGEXP3 + kdDebug() << QString(" Setting new pos to %1.").arg(pos) << endl; +#endif + oldpos = pos; + } + } + +#ifdef DEBUG_KREGEXP3 + kdDebug() << "Finished the analysis of replacementStr!" << endl; +#endif + Q_ASSERT( literalStrs.count() == backRefs.count() + 1 ); + + //-------- actual construction of the + //-------- resulting QString + QString result = ""; + oldpos = 0; + pos = start; + + QStringList::Iterator sIt; + QValueList<int>::Iterator iIt; + + if ( start < 0 ) + start += str.length(); + +#ifdef DEBUG_KREGEXP3 + kdDebug() << "Constructing the resultant string starts now:" << endl; +#endif + + while ( pos < (int)str.length() ) { + pos = search( str, pos ); + +#ifdef DEBUG_KREGEXP3 + kdDebug() << QString(" Found match at pos %1").arg(pos) << endl; +#endif + + if ( pos < 0 ) { + result += str.mid( oldpos ); +#ifdef DEBUG_KREGEXP3 + kdDebug() << " No more matches. Adding trailing part from str:" << endl; + kdDebug() << " result == \"" + result + "\"" << endl; +#endif + break; + } else { + result += str.mid( oldpos, pos-oldpos ); +#ifdef DEBUG_KREGEXP3 + kdDebug() << " Adding unchanged part from str:" << endl; + kdDebug() << " result == \"" + result + "\"" << endl; +#endif + for ( sIt = literalStrs.begin(), iIt = backRefs.begin() ; + iIt != backRefs.end() ; ++sIt, ++iIt ) { + result += (*sIt); +#ifdef DEBUG_KREGEXP3 + kdDebug() << " Adding literal replacement part:" << endl; + kdDebug() << " result == \"" + result + "\"" << endl; +#endif + result += cap( (*iIt) ); +#ifdef DEBUG_KREGEXP3 + kdDebug() << " Adding captured string:" << endl; + kdDebug() << " result == \"" + result + "\"" << endl; +#endif + } + result += (*sIt); +#ifdef DEBUG_KREGEXP3 + kdDebug() << " Adding literal replacement part:" << endl; + kdDebug() << " result == \"" + result + "\"" << endl; +#endif + } + if (matchedLength() == 0 && pos == 0) { + // if we matched the begin of the string, then better avoid endless + // recursion + result += str.mid( oldpos ); + break; + } + pos += matchedLength(); +#ifdef DEBUG_KREGEXP3 + kdDebug() << QString(" Setting new pos to %1.").arg(pos) << endl; +#endif + oldpos = pos; + + if ( !global ) { + // only replace the first occurrence, so stop here: + result += str.mid( oldpos ); + break; + } + } + + return result; +} |