2022-05-24 Fred Gleason <fredg@paravelsystems.com>

* Added an 'RDRange' class.
	* Added support for range specifications to the 'line' parameter
	of the 'GPI Enable' ['GE'] RML.

Signed-off-by: Fred Gleason <fredg@paravelsystems.com>

lib/rdrange.cpp

@@ -0,0 +1,88 @@
+// rdrange.cpp
+//
+// Implement Rivendell range specifications
+//
+//   (C) Copyright 2022 Fred Gleason <fredg@paravelsystems.com>
+//
+//   This program is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU General Public License version 2 as
+//   published by the Free Software Foundation.
+//
+//   This program is distributed in the hope that it will be useful,
+//   but WITHOUT ANY WARRANTY; without even the implied warranty of
+//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//   GNU General Public License for more details.
+//
+//   You should have received a copy of the GNU General Public
+//   License along with this program; if not, write to the Free Software
+//   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#include <QStringList>
+
+#include "rdrange.h"
+
+RDRange::RDRange(int max_end)
+{
+  d_max_end=max_end;
+  d_start=0;
+  d_end=0;
+}
+
+
+int RDRange::start() const
+{
+  return d_start;
+}
+
+
+int RDRange::end() const
+{
+  return d_end;
+}
+
+
+bool RDRange::parse(const QString &str)
+{
+  QStringList f0=str.split(":",QString::KeepEmptyParts);
+  bool ok1=false;
+  bool ok2=false;
+
+  switch(f0.size()) {
+  case 1:
+    d_start=f0.at(0).toInt(&ok1);
+    d_end=f0.at(0).toInt(&ok2);
+    if((!ok1)||(!ok2)||(d_start<=0)||(d_start>d_max_end)) {
+      d_start=0;
+      d_end=0;
+      return false;
+    }
+    return true;
+
+  case 2:
+    if(f0.at(0).isEmpty()) {
+      d_start=1;
+      ok1=true;
+    }
+    else {
+      d_start=f0.at(0).toInt(&ok1);
+    }
+    if(f0.at(1).isEmpty()) {
+      d_end=d_max_end;
+      ok2=true;
+    }
+    else {
+      d_end=f0.at(1).toInt(&ok2);
+    }
+    if((!ok1)||(!ok2)||(d_start<=0)||(d_end>d_max_end)||(d_start>d_end)) {
+      d_start=0;
+      d_end=0;
+      return false;
+    }
+    return true;
+  }
+
+  d_start=0;
+  d_end=0;
+  return false;
+}