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parsinghelpers.h

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00001 /* This file is part of the KDE libraries
00002     Copyright (C) 2008 Andreas Hartmetz <ahartmetz@gmail.com>
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to
00016     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017     Boston, MA 02110-1301, USA.
00018 */
00019 
00020 #ifndef PARSINGHELPERS_H
00021 #define PARSINGHELPERS_H
00022 
00023 #include <QtCore/QList>
00024 #include <QtCore/QPair>
00025 
00026 struct HeaderField {
00027     HeaderField(bool multiValued)
00028         { isMultiValued = multiValued; }
00029     // QHash requires a default constructor
00030     HeaderField()
00031         { isMultiValued = false; }
00032 
00033     bool isMultiValued;
00034     QList<QPair<int, int> > beginEnd;
00035 };
00036 
00037 class HeaderTokenizer;
00038 class TokenIterator
00039 {
00040 public:
00041     inline bool hasNext() const
00042     {
00043         return m_currentToken < m_tokens.count();
00044     }
00045 
00046     QByteArray next();
00047 
00048     QByteArray current() const;
00049 
00050     QList<QByteArray> all() const;
00051 
00052 private:
00053     friend class HeaderTokenizer;
00054     QList<QPair<int, int> > m_tokens;
00055     int m_currentToken;
00056     const char *m_buffer;
00057     TokenIterator(const QList<QPair<int, int> > &tokens, const char *buffer)
00058      : m_tokens(tokens),
00059        m_currentToken(0),
00060        m_buffer(buffer) {}
00061 };
00062 
00063 class HeaderTokenizer : public QHash<QByteArray, HeaderField>
00064 {
00065 public:
00066     HeaderTokenizer(char *buffer);
00067     // note that buffer is not const - in the parsed area CR/LF will be overwritten
00068     // with spaces if there is a line continuation.
00070     int tokenize(int begin, int end);
00071 
00072     // after tokenize() has been called use the QHash part of this class to
00073     // ask for a list of begin-end indexes in buffer for header values.
00074 
00075     TokenIterator iterator(const char *key);
00076 private:
00077     char *m_buffer;
00078     struct HeaderFieldTemplate {
00079         const char *name;
00080         bool isMultiValued;
00081     };
00082     QList<QPair<int, int> > m_nullTokens;   //long-lived, allows us to pass out references.
00083 };
00084 
00085 #endif //PARSINGHELPERS_H

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