1 files changed, 48 insertions, 0 deletions
diff --git a/ink_stroke_modeler/internal/validation.h b/ink_stroke_modeler/internal/validation.h
new file mode 100644
index 0000000..e01aa1a
--- /dev/null
+++ b/ink_stroke_modeler/internal/validation.h
@@ -0,0 +1,48 @@
+#ifndef INK_STROKE_MODELER_INTERNAL_VALIDATION_H_
+#define INK_STROKE_MODELER_INTERNAL_VALIDATION_H_
+
+#include "absl/status/status.h"
+#include "absl/strings/string_view.h"
+#include "absl/strings/substitute.h"
+
+template <typename T>
+absl::Status ValidateIsFiniteNumber(T value, absl::string_view label) {
+  if (std::isnan(value)) {
+    return absl::InvalidArgumentError(absl::Substitute("$0 is NaN", label));
+  }
+  if (std::isinf(value)) {
+    return absl::InvalidArgumentError(
+        absl::Substitute("$0 is infinite", label));
+  }
+  return absl::OkStatus();
+}
+
+template <typename T>
+absl::Status ValidateGreaterThanZero(T value, absl::string_view label) {
+  if (absl::Status status = ValidateIsFiniteNumber(value, label);
+      !status.ok()) {
+    return status;
+  }
+  if (value <= 0) {
+    return absl::InvalidArgumentError(absl::Substitute(
+        "$0 must be greater than zero. Actual value: $1", label, value));
+  }
+  return absl::OkStatus();
+}
+
+template <typename T>
+absl::Status ValidateGreaterThanOrEqualToZero(T value,
+                                              absl::string_view label) {
+  if (absl::Status status = ValidateIsFiniteNumber(value, label);
+      !status.ok()) {
+    return status;
+  }
+  if (value < 0) {
+    return absl::InvalidArgumentError(absl::Substitute(
+        "$0 must be greater than or equal to zero. Actual value: $1", label,
+        value));
+  }
+  return absl::OkStatus();
+}
+
+#endif  // INK_STROKE_MODELER_INTERNAL_VALIDATION_H_