Closes #13

core/dbc_diagnostic.h

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: MIT
+#ifndef DBC_DIAGNOSTIC_H
+#define DBC_DIAGNOSTIC_H
+
+#include "dbc_database.h"
+#include <cstddef>
+#include <string>
+#include <vector>
+
+enum class DbcDiagnosticSeverity {
+    Warning,
+    Error
+};
+
+/** Stable categories; messages provide the details. */
+enum class DbcDiagnosticCode {
+    FileOpenError,
+    FileReadError,
+    InvalidStatement,
+    InvalidValueDescription,
+    InvalidMultiplexing,
+    UnsupportedStatement
+};
+
+struct DbcDiagnostic {
+    DbcDiagnosticSeverity severity;
+    DbcDiagnosticCode code;
+    std::string filePath;
+    std::size_t lineNumber; // One-based physical line; zero for file-level errors.
+    std::string message;
+};
+
+struct DbcParseResult {
+    DbcDatabase database;
+    std::vector<DbcDiagnostic> diagnostics;
+
+    bool HasErrors() const {
+        for (const DbcDiagnostic &diagnostic : diagnostics) {
+            if (diagnostic.severity == DbcDiagnosticSeverity::Error)
+                return true;
+        }
+        return false;
+    }
+};
+
+#endif /* DBC_DIAGNOSTIC_H */