cabana: refactor new msg/signal name generation (#27931)

tools/cabana/dbc/dbcfile.cc

@@ -149,6 +149,24 @@ void DBCFile::removeMsg(const MessageId &id) {
   msgs.erase(id.address);
 }
 
+QString DBCFile::newMsgName(const MessageId &id) {
+  return QString("NEW_MSG_") + QString::number(id.address, 16).toUpper();
+}
+
+QString DBCFile::newSignalName(const MessageId &id) {
+  auto m = msg(id);
+  assert(m != nullptr);
+
+  QString name;
+
+  for (int i = 1; /**/; ++i) {
+    name = QString("NEW_SIGNAL_%1").arg(i);
+    if (m->sig(name) == nullptr) break;
+  }
+
+  return name;
+}
+
 std::map<uint32_t, cabana::Msg> DBCFile::getMessages() {
   return msgs;
 }

tools/cabana/dbc/dbcfile.h

@@ -38,6 +38,9 @@ public:
   void updateMsg(const MessageId &id, const QString &name, uint32_t size);
   void removeMsg(const MessageId &id);
 
+  QString newMsgName(const MessageId &id);
+  QString newSignalName(const MessageId &id);
+
   std::map<uint32_t, cabana::Msg> getMessages();
   const cabana::Msg *msg(const MessageId &id) const;
   const cabana::Msg *msg(uint32_t address) const;

tools/cabana/dbc/dbcmanager.cc

@@ -133,6 +133,20 @@ void DBCManager::removeMsg(const MessageId &id) {
   }
 }
 
+QString DBCManager::newMsgName(const MessageId &id) {
+  auto sources_dbc_file = findDBCFile(id);
+  assert(sources_dbc_file); // This should be impossible
+  auto [_, dbc_file] = *sources_dbc_file;
+  return dbc_file->newMsgName(id);
+}
+
+QString DBCManager::newSignalName(const MessageId &id) {
+  auto sources_dbc_file = findDBCFile(id);
+  assert(sources_dbc_file); // This should be impossible
+  auto [_, dbc_file] = *sources_dbc_file;
+  return dbc_file->newSignalName(id);
+}
+
 std::map<MessageId, cabana::Msg> DBCManager::getMessages(uint8_t source) {
   std::map<MessageId, cabana::Msg> ret;
 

tools/cabana/dbc/dbcmanager.h

@@ -33,6 +33,9 @@ public:
   void updateMsg(const MessageId &id, const QString &name, uint32_t size);
   void removeMsg(const MessageId &id);
 
+  QString newMsgName(const MessageId &id);
+  QString newSignalName(const MessageId &id);
+
   std::map<MessageId, cabana::Msg> getMessages(uint8_t source);
   const cabana::Msg *msg(const MessageId &id) const;
   const cabana::Msg* msg(uint8_t source, const QString &name);

tools/cabana/signalview.cc

@@ -8,6 +8,7 @@
 #include <QHelpEvent>
 #include <QMessageBox>
 #include <QPainter>
+#include <QPainterPath>
 #include <QPushButton>
 #include <QScrollBar>
 #include <QtConcurrent>
@@ -223,19 +224,13 @@ bool SignalModel::saveSignal(const cabana::Signal *origin_s, cabana::Signal &s)
 
 void SignalModel::addSignal(int start_bit, int size, bool little_endian) {
   auto msg = dbc()->msg(msg_id);
-  for (int i = 0; !msg; ++i) {
-    QString name = QString("NEW_MSG_") + QString::number(msg_id.address, 16).toUpper();
-    if (!dbc()->msg(msg_id.source, name)) {
-      UndoStack::push(new EditMsgCommand(msg_id, name, can->lastMessage(msg_id).dat.size()));
-      msg = dbc()->msg(msg_id);
-    }
+  if (!msg) {
+    QString name = dbc()->newMsgName(msg_id);
+    UndoStack::push(new EditMsgCommand(msg_id, name, can->lastMessage(msg_id).dat.size()));
+    msg = dbc()->msg(msg_id);
   }
 
-  cabana::Signal sig = {.is_little_endian = little_endian, .factor = 1, .min = "0", .max = QString::number(std::pow(2, size) - 1)};
-  for (int i = 1; /**/; ++i) {
-    sig.name = QString("NEW_SIGNAL_%1").arg(i);
-    if (msg->sig(sig.name) == nullptr) break;
-  }
+  cabana::Signal sig = {.name = dbc()->newSignalName(msg_id), .is_little_endian = little_endian, .factor = 1, .min = "0", .max = QString::number(std::pow(2, size) - 1)};
   updateSigSizeParamsFromRange(sig, start_bit, size);
   UndoStack::push(new AddSigCommand(msg_id, sig));
 }