feat: finish option and variable in clap

src/yycc/carton/clap/variable.hpp

@@ -0,0 +1,65 @@
+#pragma once
+#include "types.hpp"
+#include "../../macro/class_copy_move.hpp"
+#include <optional>
+#include <string>
+#include <vector>
+#include <map>
+
+#define NS_YYCC_CLAP_TYPES ::yycc::carton::clap::types
+
+namespace yycc::carton::clap::variable {
+
+    class Variable {
+    public:
+        Variable(const std::u8string_view& name, const std::u8string_view& description);
+        ~Variable();
+        YYCC_DEFAULT_COPY_MOVE(Variable)
+
+    public:
+        std::u8string_view get_name() const;
+        std::u8string_view get_description() const;
+
+    private:
+        std::u8string name;
+        std::u8string description;
+    };
+
+    class RegisteredVariable {
+    public:
+        RegisteredVariable(NS_YYCC_CLAP_TYPES::Token token, Variable&& variable);
+        ~RegisteredVariable();
+        YYCC_DEFAULT_COPY_MOVE(RegisteredVariable)
+
+    public:
+        NS_YYCC_CLAP_TYPES::Token get_token() const;
+        const Variable& get_variable() const;
+
+    private:
+        NS_YYCC_CLAP_TYPES::Token token;
+        Variable variable;
+    };
+
+    class VariableCollection {
+    public:
+        VariableCollection();
+        ~VariableCollection();
+        YYCC_DEFAULT_COPY_MOVE(VariableCollection)
+
+    public:
+        NS_YYCC_CLAP_TYPES::Token add_variable(Variable&& var);
+        std::optional<NS_YYCC_CLAP_TYPES::Token> find_name(const std::u8string_view& name) const;
+        bool has_variable(NS_YYCC_CLAP_TYPES::Token token) const;
+        const Variable& get_variable(NS_YYCC_CLAP_TYPES::Token token) const;
+        const std::vector<RegisteredVariable>& all_variables() const;
+        size_t length() const;
+        bool empty() const;
+
+    private:
+        std::map<std::u8string, NS_YYCC_CLAP_TYPES::Token> names;
+        std::vector<RegisteredVariable> variables;
+    };
+
+} // namespace yycc::carton::clap::variable
+
+#undef NS_YYCC_CLAP_TYPES