From a1d19cf09c917d8e1e51b84b25c05198cb97dad3 Mon Sep 17 00:00:00 2001
From: yyc12345 <yyc12321@outlook.com>
Date: Tue, 9 Dec 2025 22:55:21 +0800
Subject: [PATCH] feat: finish clap parser and resolver

---
 src/yycc/carton/clap/parser.cpp   | 18 ++++++++---
 src/yycc/carton/clap/resolver.cpp | 52 ++++++++++++++++++++++++++++++-
 2 files changed, 64 insertions(+), 6 deletions(-)

diff --git a/src/yycc/carton/clap/parser.cpp b/src/yycc/carton/clap/parser.cpp
index 5ecaf41..b7ae9ee 100644
--- a/src/yycc/carton/clap/parser.cpp
+++ b/src/yycc/carton/clap/parser.cpp
@@ -48,7 +48,8 @@ namespace yycc::carton::clap::parser {
     /// @brief The state machine context prepared for parser.
     struct ParserContext {
         ParserContext(const APPLICATION::Application& app) : state(ParserState::Normal), opt_waiting(std::nullopt), app(app), values() {}
-        YYCC_DEFAULT_COPY_MOVE(ParserContext)
+        // We have a "const" reference member so we delete these.
+        YYCC_DELETE_COPY_MOVE(ParserContext)
 
         ParserState state;                                           ///< Current state.
         std::optional<TYPES::Token> opt_waiting;                     ///< The token to the option waiting for associated value.
@@ -61,14 +62,15 @@ namespace yycc::carton::clap::parser {
 #pragma region Core
 
     /// @brief Core capture function.
-    static TYPES::ClapResult<std::map<TYPES::Token, std::optional<std::u8string>>> capture(const APPLICATION::Application& app) {
+    template<std::ranges::viewable_range V>
+    static TYPES::ClapResult<std::map<TYPES::Token, std::optional<std::u8string>>> capture(const APPLICATION::Application& app, V args) {
         // Create context.
         ParserContext ctx(app);
 
         // Fetch commandline arguments
         // And skip the first argument because it is the path to executable.
         // Then start to execute until all arguments are consumed.
-        for (const auto& arg : ENV::get_args() | std::views::drop(1)) {
+        for (const auto& arg : args | std::views::drop(1)) {
             // Fetch argument kind
             ClassifiedArgument classified_arg(arg);
 
@@ -170,11 +172,17 @@ namespace yycc::carton::clap::parser {
 #pragma region Parser Class
 
     TYPES::ClapResult<Parser> Parser::from_user(const APPLICATION::Application& app, const std::vector<std::u8string_view>& args) {
-        return TYPES::ClapResult<Parser>();
+        auto rv = capture(app, args);
+        if (rv.has_value()) return Parser(std::move(rv.value()));
+        else return std::unexpected(rv.error());
     }
 
     TYPES::ClapResult<Parser> Parser::from_system(const APPLICATION::Application& app) {
-        return TYPES::ClapResult<Parser>();
+        auto rv = capture(app, ENV::get_args() | std::views::transform([](auto s) {
+                                   return std::u8string_view(s);
+                               }));
+        if (rv.has_value()) return Parser(std::move(rv.value()));
+        else return std::unexpected(rv.error());
     }
 
     Parser::Parser(decltype(Parser::values)&& value) : values(std::move(values)) {}
diff --git a/src/yycc/carton/clap/resolver.cpp b/src/yycc/carton/clap/resolver.cpp
index 32ec900..f40781e 100644
--- a/src/yycc/carton/clap/resolver.cpp
+++ b/src/yycc/carton/clap/resolver.cpp
@@ -1,16 +1,66 @@
 #include "resolver.hpp"
 #include "types.hpp"
+#include "../../env.hpp"
+#include <stdexcept>
+#include <ranges>
 
 #define TYPES ::yycc::carton::clap::types
-
+#define APPLICATION ::yycc::carton::clap::application
+#define ENV ::yycc::env
 namespace yycc::carton::clap::resolver {
 
 #pragma region Core
 
+    /// @brief Core capture function
+    template<std::ranges::viewable_range V>
+    static TYPES::ClapResult<std::map<TYPES::Token, std::optional<std::u8string>>> capture(const APPLICATION::Application& app, V vars) {
+        std::map<TYPES::Token, std::optional<std::u8string>> values;
+        const auto& variables = app.get_variables();
+
+        // Iterate variable list and process them one by one.
+        for (const auto& [name, value] : vars) {
+            // Check whether capture this variable.
+            auto opt_token = variables.find_name(name);
+            if (!opt_token.has_value()) continue;
+            auto token = opt_token.value();
+
+            // Check whether it is captured.
+            // If it is already captured, report error,
+            // because environment variable can not be duplicated.
+            if (values.contains(token)) {
+                throw std::runtime_error("impossible duplicated environment variable name.");
+            }
+
+            // Finally check whether it care value, and insert data.
+            if (variables.get_variable(token).is_care_value()) {
+                values.emplace(token, value);
+            } else {
+                values.emplace(token, std::nullopt);
+            }
+        }
+
+        return values;
+    }
+
 #pragma endregion
 
 #pragma region Resolver Class
 
+    TYPES::ClapResult<Resolver> Resolver::from_user(const APPLICATION::Application& app,
+                                                    const std::vector<std::pair<std::u8string_view, std::u8string_view>>& vars) {
+        auto rv = capture(app, vars);
+        if (rv.has_value()) return Resolver(std::move(rv.value()));
+        else return std::unexpected(rv.error());
+    }
+
+    TYPES::ClapResult<Resolver> Resolver::from_system(const APPLICATION::Application& app) {
+        auto rv = capture(app, ENV::get_vars() | std::views::transform([](auto p) {
+                                   return std::make_pair<std::u8string_view, std::u8string_view>(p.first, p.second);
+                               }));
+        if (rv.has_value()) return Resolver(std::move(rv.value()));
+        else return std::unexpected(rv.error());
+    }
+
     Resolver::Resolver(decltype(Resolver::values)&& values) : values(std::move(values)) {}
 
     Resolver::~Resolver() {}