4 files changed, 60 insertions, 0 deletions
diff --git a/src/common/Exception.cpp b/src/common/Exception.cpp
index b0053bac..e1e3e128 100644
--- a/src/common/Exception.cpp
+++ b/src/common/Exception.cpp
@@ -19,6 +19,15 @@ const char* Exception::what() const noexcept {
   return utf8_message_.c_str();
 }
 
+void Exception::AppendMessage(StringView additional_message) {
+  message_ += u" ";
+  message_ += additional_message;
+}
+
+void Exception::AppendMessage(std::optional<StringView> additional_message) {
+  if (additional_message) AppendMessage(*additional_message);
+}
+
 ErrnoException::ErrnoException(const String& message)
     : ErrnoException(message, errno) {}
 
diff --git a/src/platform/CMakeLists.txt b/src/platform/CMakeLists.txt
index 3f85adbc..4779bb57 100644
--- a/src/platform/CMakeLists.txt
+++ b/src/platform/CMakeLists.txt
@@ -1,6 +1,7 @@
 add_library(CruPlatformBase
 	ForDllExport.cpp
 	Color.cpp
+	Exception.cpp
 	GraphicsBase.cpp
 )
 target_link_libraries(CruPlatformBase PUBLIC CruBase)
diff --git a/src/platform/Exception.cpp b/src/platform/Exception.cpp
new file mode 100644
index 00000000..7aef3b7f
--- /dev/null
+++ b/src/platform/Exception.cpp
@@ -0,0 +1,44 @@
+#include "cru/platform/Exception.h"
+#include "cru/common/Format.h"
+
+#include <optional>
+
+namespace cru::platform {
+PlatformNotMatchException::PlatformNotMatchException(
+    String resource_platform, String target_platform,
+    std::optional<StringView> additional_message)
+    : resource_platform_(std::move(resource_platform)),
+      target_platform_(std::move(target_platform)) {
+  SetMessage(
+      Format(u"Resource platform '{}' does not match target platform '{}'.",
+             resource_platform_, target_platform_));
+
+  AppendMessage(additional_message);
+}
+
+PlatformNotMatchException::~PlatformNotMatchException() {}
+
+String PlatformNotMatchException::GetResourcePlatform() const {
+  return resource_platform_;
+}
+
+String PlatformNotMatchException::GetTargetPlatform() const {
+  return target_platform_;
+}
+
+PlatformUnsupportedException::PlatformUnsupportedException(
+    String platform, String operation,
+    std::optional<StringView> additional_message)
+    : platform_(std::move(platform)), operation_(std::move(operation)) {
+  SetMessage(Format(u"Operation '{}' is not supported on platform '{}'.",
+                    operation_, platform_));
+  AppendMessage(additional_message);
+}
+
+PlatformUnsupportedException::~PlatformUnsupportedException() {}
+
+String PlatformUnsupportedException::GetPlatform() const { return platform_; }
+
+String PlatformUnsupportedException::GetOperation() const { return operation_; }
+
+}  // namespace cru::platform
diff --git a/src/platform/graphics/SvgGeometry.cpp b/src/platform/graphics/SvgGeometry.cpp
index 149c4bb6..b757c520 100644
--- a/src/platform/graphics/SvgGeometry.cpp
+++ b/src/platform/graphics/SvgGeometry.cpp
@@ -1 +1,7 @@
 #include "cru/platform/graphics/SvgGeometry.h"
+
+namespace cru::platform::graphics {
+SvgGeometryBuilder::SvgGeometryBuilder() {}
+
+SvgGeometryBuilder::~SvgGeometryBuilder() {}
+}  // namespace cru::platform::graphics