FormatDateTime.h

/******************************************************************************************************
 * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released      *
 * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
 * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission.     *
 ******************************************************************************************************/
 
#ifndef FORMAT_DATE_TIME_H
#define FORMAT_DATE_TIME_H
 
#include "CoordUnitsDate.h"
#include "CoordUnitsTime.h"
#include <QDateTime>
#include <QHash>
#include <QString>
#include <QStringList>
#include <QValidator>
 
typedef QHash<CoordUnitsDate, QString> FormatDate;
typedef QHash<CoordUnitsTime, QString> FormatTime;
 
typedef QHash<CoordUnitsDate, QStringList> FormatsDate;
typedef QHash<CoordUnitsTime, QStringList> FormatsTime;
 
class FormatDateTime {
 public:
  FormatDateTime();
 
  QString formatOutput (CoordUnitsDate coordUnitsDate,
                        CoordUnitsTime coordUnitsTime,
                        double value) const;
  
  QValidator::State parseInput (CoordUnitsDate coordUnitsDate,
                                CoordUnitsTime coordUnitsTime,
                                const QString &stringUntrimmed,
                                double &value) const;
  
 private:
 
  bool ambiguityBetweenDateAndTime (CoordUnitsDate coordUnitsDate,
                                    CoordUnitsTime coordUnitsTime,
                                    const QString &string) const;
  void dateTimeLookup (const FormatsDate &formatsDate,
                       const FormatsTime &formatsTime,
                       CoordUnitsDate coordUnitsDate,
                       CoordUnitsTime coordUnitsTime,
                       const QString &string,
                       bool useQDateTimeElseQRegExp,
                       double &value, // Set only if useQDateTimeElseQRegExp=success=true
                       bool &success) const;
  void loadFormatsFormat();
  void loadFormatsParseAcceptable();
  void loadFormatsParseIncomplete();
 
  // For formatting output
  FormatDate m_formatsDateFormat;
  FormatTime m_formatsTimeFormat;
 
  // For parsing input, using built in Qt date/time parsing according to QDateTime
  FormatsDate m_formatsDateParseAcceptable;
  FormatsTime m_formatsTimeParseAcceptable;
 
  // For parsing input, after input has been found to not be Acceptable. Regular expressions are used since Qt date/time
  // parsing of Intermediate strings does not work. Example, 'J' and 'Ja' would be rejected although they are typed
  // in the process of entering 'Jan' for the month
  FormatsDate m_formatsDateParseIncomplete;
  FormatsTime m_formatsTimeParseIncomplete;
};
 
#endif // FORMAT_DATE_TIME_H