Qt: Implement advanced mapping I/O windows

Source/Core/DolphinQt2/Config/Mapping/MappingCommon.cpp

@@ -0,0 +1,50 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt2/Config/Mapping/MappingCommon.h"
+
+#include <QRegExp>
+#include <QString>
+
+#include "InputCommon/ControlReference/ControlReference.h"
+#include "InputCommon/ControllerInterface/Device.h"
+
+namespace MappingCommon
+{
+QString GetExpressionForControl(const QString& control_name,
+                                const ciface::Core::DeviceQualifier& control_device,
+                                const ciface::Core::DeviceQualifier& default_device)
+{
+  QString expr;
+
+  // non-default device
+  if (control_device != default_device)
+  {
+    expr += QString::fromStdString(control_device.ToString());
+    expr += QStringLiteral(":");
+  }
+
+  // append the control name
+  expr += control_name;
+
+  QRegExp reg(QStringLiteral("[a-zA-Z]+"));
+  if (!reg.exactMatch(expr))
+    expr = QStringLiteral("`%1`").arg(expr);
+  return expr;
+}
+
+QString DetectExpression(ControlReference* reference, ciface::Core::Device* device,
+                         const ciface::Core::DeviceQualifier& m_devq,
+                         const ciface::Core::DeviceQualifier& default_device)
+{
+  ciface::Core::Device::Control* const ctrl = reference->Detect(5000, device);
+
+  if (ctrl)
+  {
+    return MappingCommon::GetExpressionForControl(QString::fromStdString(ctrl->GetName()), m_devq,
+                                                  default_device);
+  }
+  return QStringLiteral("");
+}
+}