Closes #25

core/attributes.h

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: MIT
+#ifndef DBC_ATTRIBUTES_H
+#define DBC_ATTRIBUTES_H
+
+#include <cstdint>
+#include <map>
+#include <optional>
+#include <string>
+#include <variant>
+#include <vector>
+
+enum class AttributeScope {
+    Database,
+    Node,
+    Frame,
+    Signal,
+    Environment
+};
+
+enum class AttributeType {
+    Integer,
+    Hex,
+    Float,
+    String,
+    Enum
+};
+
+using AttributeValue = std::variant<std::int64_t, double, std::string>;
+using AttributeMap = std::map<std::string, AttributeValue>;
+
+struct AttributeDefinition {
+    AttributeScope scope = AttributeScope::Database;
+    AttributeType type = AttributeType::String;
+    std::int64_t integerMinimum = 0;
+    std::int64_t integerMaximum = 0;
+    double minimum = 0.0;
+    double maximum = 0.0;
+    std::vector<std::string> enumValues;
+    std::optional<AttributeValue> defaultValue;
+};
+
+/** Explicit assignment; defaults remain on definitions. Named nodes/environment
+ * variables are retained without validating declarations, which are not parsed. */
+struct AttributeAssignment {
+    std::string name;
+    AttributeScope scope = AttributeScope::Database;
+    std::uint32_t canId = 0U;
+    bool isExtended = false;
+    std::string targetName;
+    AttributeValue value;
+};
+
+#endif