1 files changed, 36 insertions, 0 deletions
diff --git a/ink_stroke_modeler/types.cc b/ink_stroke_modeler/types.cc
new file mode 100644
index 0000000..9864ea3
--- /dev/null
+++ b/ink_stroke_modeler/types.cc
@@ -0,0 +1,36 @@
+#include "ink_stroke_modeler/types.h"
+
+#include "absl/status/status.h"
+#include "ink_stroke_modeler/internal/validation.h"
+
+// This convenience macro evaluates the given expression, and if it does not
+// return an OK status, returns and propagates the status.
+#define RETURN_IF_ERROR(expr)                              \
+  do {                                                     \
+    if (auto status = (expr); !status.ok()) return status; \
+  } while (false)
+
+namespace ink {
+namespace stroke_model {
+
+absl::Status ValidateInput(const Input& input) {
+  switch (input.event_type) {
+    case Input::EventType::kUp:
+    case Input::EventType::kMove:
+    case Input::EventType::kDown:
+      break;
+    default:
+      return absl::InvalidArgumentError("Unknown Input.event_type.");
+  }
+  RETURN_IF_ERROR(ValidateIsFiniteNumber(input.position.x, "Input.position.x"));
+  RETURN_IF_ERROR(ValidateIsFiniteNumber(input.position.y, "Input.position.y"));
+  RETURN_IF_ERROR(ValidateIsFiniteNumber(input.time.Value(), "Input.time"));
+  RETURN_IF_ERROR(ValidateIsFiniteNumber(input.pressure, "Input.pressure"));
+  RETURN_IF_ERROR(ValidateIsFiniteNumber(input.tilt, "Input.tilt"));
+  RETURN_IF_ERROR(
+      ValidateIsFiniteNumber(input.orientation, "Input.orientation"));
+  return absl::OkStatus();
+}
+
+}  // namespace stroke_model
+}  // namespace ink