CsvUtil.C

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/*
 * Copyright (C) 2008 Emweb bv, Herent, Belgium.
 *
 * See the LICENSE file for terms of use.
 */

#include <stdlib.h>
#include <boost/tokenizer.hpp>

#include <Wt/WAbstractItemModel>
#include <Wt/WString>

#include "CsvUtil.h"

void readFromCsv(std::istream& f, Wt::WAbstractItemModel *model,
                 int numRows, bool firstLineIsHeaders)
{
  int csvRow = 0;

  while (f) {
    std::string line;
    getline(f, line);

    if (f) {
      typedef boost::tokenizer<boost::escaped_list_separator<char> >
        CsvTokenizer;
      CsvTokenizer tok(line);

      int col = 0;
      for (CsvTokenizer::iterator i = tok.begin();
           i != tok.end(); ++i, ++col) {

        if (col >= model->columnCount())
          model->insertColumns(model->columnCount(),
                               col + 1 - model->columnCount());

        if (firstLineIsHeaders && csvRow == 0)
          model->setHeaderData(col, boost::any(Wt::WString::fromUTF8(*i)));
        else {
          int dataRow = firstLineIsHeaders ? csvRow - 1 : csvRow;

          if (numRows != -1 && dataRow >= numRows)
            return;

          if (dataRow >= model->rowCount())
            model->insertRows(model->rowCount(),
                              dataRow + 1 - model->rowCount());

          boost::any data;
          std::string s = *i;

          char *endptr;

          if (s.empty())
            data = boost::any();
          else {
            double d = strtod(s.c_str(), &endptr);
            if (*endptr == 0)
              data = boost::any(d);
            else
              data = boost::any(Wt::WString::fromUTF8(s));
          }

          model->setData(dataRow, col, data);
        }
      }
    }

    ++csvRow;
  }
}