csvview.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtGui>
 #include <QtNetwork>
 #include "csvview.h"

 CSVView::CSVView(const QString &mimeType, QWidget *parent)
     : QTableView(parent)
 {
     this->mimeType = mimeType;
 }

 void CSVView::updateModel()
 {
     QNetworkReply *reply = static_cast<QNetworkReply *>(sender());

     if (reply->error() != QNetworkReply::NoError)
         return;

     bool hasHeader = false;
     QString charset = "latin1";

     foreach (QString piece, mimeType.split(";")) {
         piece = piece.trimmed();
         if (piece.contains("=")) {
             int index = piece.indexOf("=");
             QString left = piece.left(index).trimmed();
             QString right = piece.mid(index + 1).trimmed();
             if (left == "header")
                 hasHeader = (right == "present");
             else if (left == "charset")
                 charset = right;
         }
     }

     QTextStream stream(reply);
     stream.setCodec(QTextCodec::codecForName(charset.toLatin1()));

     QStandardItemModel *model = new QStandardItemModel(this);
     QList<QStandardItem *> items;
     bool firstLine = hasHeader;
     bool wasQuote = false;
     bool wasCR = false;
     bool quoted = false;
     QString text;

     while (!stream.atEnd()) {

         QString ch = stream.read(1);

         if (wasQuote) {
             if (ch == "\"") {
                 if (quoted) {
                     text += ch;         // quoted "" are inserted as "
                     wasQuote = false;   // no quotes are pending
                 } else {
                     quoted = true;      // unquoted "" starts quoting
                     wasQuote = true;    // with a pending quote
                 }
                 continue;               // process the next character

             } else {
                 quoted = !quoted;       // process the pending quote
                 wasQuote = false;       // no quotes are pending
             }                           // process the current character

         } else if (wasCR) {
             wasCR = false;

             if (ch == "\n") {           // CR LF represents the end of a row
                 if (!text.isEmpty())
                     items.append(new QStandardItem(QString(text)));

                 addRow(firstLine, model, items);
                 items.clear();
                 text = "";
                 firstLine = false;
                 continue;               // process the next character
             } else
                 text += "\r";           // CR on its own is inserted
         }                               // process the current character

         // wasQuote is never true here.
         // wasCR is never true here.

         if (ch == "\"")
             wasQuote = true;            // handle the pending quote later

         else if (ch == ",") {
             if (quoted)
                 text += ch;
             else {
                 items.append(new QStandardItem(QString(text)));
                 text = "";
             }
         }

         else if (ch == "\r") {
             if (!quoted)
                 wasCR = true;
             else
                 text += ch;
         }

         else if (ch == "\n")
             text += ch;
         else
             text += ch;

     }

     if (items.count() > 0)
         addRow(firstLine, model, items);

     reply->close();

     setModel(model);
     resizeColumnsToContents();
     horizontalHeader()->setStretchLastSection(true);
 }

 void CSVView::addRow(bool firstLine, QStandardItemModel *model,
                      const QList<QStandardItem *> &items)
 {
     if (firstLine) {
         for (int j = 0; j < items.count(); ++j)
             model->setHorizontalHeaderItem(j, items[j]);
     } else
         model->appendRow(items);
 }