WSJT-X/decodedtext.cpp

#include "decodedtext.h"

#include <QStringList>
#include <QRegularExpression>

extern "C" {
  bool stdmsg_(const char* msg, int len);
}

QString DecodedText::CQersCall()
{
  QRegularExpression callsign_re {R"(\s(CQ|DE|QRZ)(\s?DX|\s([A-Z]{2}|\d{3}))?\s(?<callsign>[A-Z0-9/]{2,})(\s[A-R]{2}[0-9]{2})?)"};
  return callsign_re.match (_string).captured ("callsign");
}


bool DecodedText::isJT65()
{
    return _string.indexOf("#") == column_mode + padding_;
}

bool DecodedText::isJT9()
{
    return _string.indexOf("@") == column_mode + padding_;
}

bool DecodedText::isTX()
{
    int i = _string.indexOf("Tx");
    return (i >= 0 && i < 15); // TODO guessing those numbers. Does Tx ever move?
}

bool DecodedText::isLowConfidence ()
{
  return QChar {'?'} == _string.mid (padding_ + column_qsoText + 21, 1);
}

int DecodedText::frequencyOffset()
{
    return _string.mid(column_freq + padding_,4).toInt();
}

int DecodedText::snr()
{
  int i1=_string.indexOf(" ")+1;
  return _string.mid(i1,3).toInt();
}

float DecodedText::dt()
{
  return _string.mid(column_dt + padding_,5).toFloat();
}

/*
2343 -11  0.8 1259 # YV6BFE F6GUU R-08
2343 -19  0.3  718 # VE6WQ SQ2NIJ -14
2343  -7  0.3  815 # KK4DSD W7VP -16
2343 -13  0.1 3627 @ CT1FBK IK5YZT R+02

0605  Tx      1259 # CQ VK3ACF QF22
*/

// find and extract any report. Returns true if this is a standard message
bool DecodedText::report(QString const& myBaseCall, QString const& dxBaseCall, /*mod*/QString& report)
{
    QString msg=_string.mid(column_qsoText + padding_).trimmed();
    if(msg.length() < 1) return false;
    msg = msg.left (22).remove (QRegularExpression {"[<>]"});
    int i1=msg.indexOf('\r');
    if (i1>0)
      msg=msg.left (i1-1);
    bool b = stdmsg_ ((msg + "                      ").toLatin1().constData(),22);  // stdmsg is a fortran routine that packs the text, unpacks it and compares the result

    QStringList w=msg.split(" ",QString::SkipEmptyParts);
    if(w.size ()
       && b && (w[0] == myBaseCall
             || w[0].endsWith ("/" + myBaseCall)
             || w[0].startsWith (myBaseCall + "/")
             || (w.size () > 1 && !dxBaseCall.isEmpty ()
                 && (w[1] == dxBaseCall
                     || w[1].endsWith ("/" + dxBaseCall)
                     || w[1].startsWith (dxBaseCall + "/")))))
    {
        QString tt="";
        if(w.size() > 2) tt=w[2];
        bool ok;
        i1=tt.toInt(&ok);
        if (ok and i1>=-50 and i1<50)
        {
            report = tt;
        }
        else
        {
            if (tt.mid(0,1)=="R")
            {
                i1=tt.mid(1).toInt(&ok);
                if(ok and i1>=-50 and i1<50)
                {
                    report = tt.mid(1);
                }
            }
        }
    }
    return b;
}

// get the first text word, usually the call
QString DecodedText::call()
{
  auto call = _string;
  call = call.replace (QRegularExpression {" CQ ([A-Z]{2,2}|[0-9]{3,3}) "}, " CQ_\\1 ").mid (column_qsoText + padding_);
  int i = call.indexOf(" ");
  return call.mid(0,i);
}

// get the second word, most likely the de call and the third word, most likely grid
void DecodedText::deCallAndGrid(/*out*/QString& call, QString& grid)
{
  auto msg = _string;
  if(msg.mid(4,1)!=" ") msg=msg.mid(0,4)+msg.mid(6,-1);  //Remove seconds from UTC
  msg = msg.replace (QRegularExpression {" CQ ([A-Z]{2,2}|[0-9]{3,3}) "}, " CQ_\\1 ").mid (column_qsoText + padding_);
  int i1 = msg.indexOf (" ");
  call = msg.mid (i1 + 1);
  int i2 = call.indexOf (" ");
  if (" R " == call.mid (i2, 3)) // MSK144 contest mode report
    {
      grid = call.mid (i2 + 3, 4);
    }
  else
    {
      grid = call.mid (i2 + 1, 4);
    }
  call = call.left (i2).replace (">", "");
}

int DecodedText::timeInSeconds()
{
    return 60*_string.mid(column_time,2).toInt() + _string.mid(2,2).toInt();
}

/*
2343 -11  0.8 1259 # YV6BFE F6GUU R-08
2343 -19  0.3  718 # VE6WQ SQ2NIJ -14
2343  -7  0.3  815 # KK4DSD W7VP -16
2343 -13  0.1 3627 @ CT1FBK IK5YZT R+02

0605  Tx      1259 # CQ VK3ACF QF22
*/

QString DecodedText::report()  // returns a string of the SNR field with a leading + or - followed by two digits
{
    int sr = snr();
    if (sr<-50)
        sr = -50;
    else
        if (sr > 49)
            sr = 49;

    QString rpt;
    rpt.sprintf("%d",abs(sr));
    if (sr > 9)
        rpt = "+" + rpt;
    else
        if (sr >= 0)
            rpt = "+0" + rpt;
        else
            if (sr >= -9)
                rpt = "-0" + rpt;
            else
                rpt = "-" + rpt;
    return rpt;
}