diff --git a/include/Feature/SemanticTokens.h b/include/Feature/SemanticTokens.h
index 6484e19e..e4be73a4 100644
--- a/include/Feature/SemanticTokens.h
+++ b/include/Feature/SemanticTokens.h
@@ -1,3 +1,12 @@
 #pragma once
 
-namespace clice::feature {}
+#include <Protocol/SemanticTokens.h>
+
+namespace clice {
+struct ParsedAST;
+}
+
+namespace clice::feature {
+protocol::SemanticTokens semanticTokens(const ParsedAST& AST, llvm::StringRef filename);
+}  // namespace clice::feature
+
diff --git a/include/Protocol/SemanticTokens.h b/include/Protocol/SemanticTokens.h
index 66fcb4f6..4539c416 100644
--- a/include/Protocol/SemanticTokens.h
+++ b/include/Protocol/SemanticTokens.h
@@ -50,4 +50,9 @@ struct SemanticTokensParams {
     TextDocumentIdentifier textDocument;
 };
 
+struct SemanticTokens {
+    /// The actual tokens.
+    std::vector<uinteger> data;
+};
+
 }  // namespace clice::protocol
diff --git a/include/Server/Option.h b/include/Server/Option.h
index 85286566..d5b7d2b8 100644
--- a/include/Server/Option.h
+++ b/include/Server/Option.h
@@ -13,6 +13,8 @@ struct Option {
         std::string binary;
         /// workplace dictionary.
         std::string workplace;
+        /// clang version.
+        std::string clang_version = "20";
     };
 
     std::string resource_dictionary;
diff --git a/src/Feature/SemanticTokens.cpp b/src/Feature/SemanticTokens.cpp
index e36eaf17..b233e0fd 100644
--- a/src/Feature/SemanticTokens.cpp
+++ b/src/Feature/SemanticTokens.cpp
@@ -12,6 +12,14 @@ namespace {
 
 class SemanticToken {};
 
+protocol::SemanticTokens semanticTokens(const ParsedAST& AST, llvm::StringRef filename) {
+    auto entry = AST.fileManager.getFileRef(filename);
+    auto fileID = AST.sourceManager.translateFile(entry.get());
+    auto tokens = AST.tokenBuffer.spelledTokens(fileID);
+
+    
+};
+
 class Highlighter : public clang::RecursiveASTVisitor<Highlighter> {
 public:
     Highlighter(ParsedAST& ast) :
diff --git a/src/Server/Option.cpp b/src/Server/Option.cpp
index bfa29552..f34d33d1 100644
--- a/src/Server/Option.cpp
+++ b/src/Server/Option.cpp
@@ -7,6 +7,20 @@ namespace clice {
 // TODO: replace builtin variable in Setting
 // e.g `{execute}` -> `execpath`
 
-void Option::parse(std::string_view workplace) {}
-    
+void Option::parse(std::string_view workplace) {
+    llvm::SmallString<128> buffer;
+    this->workplace = workplace;
+    if(auto error = fs::real_path(argv[0], buffer)) {
+        // FIXME: handle error
+    }
+    binary = path::parent_path(buffer);
+    buffer.clear();
+    path::append(buffer, path::parent_path(binary), "lib", "clang", clang_version);
+    resource_dictionary = buffer.str();
+
+    buffer.clear();
+    path::append(buffer, workplace, "build");
+    compile_commands_directory = buffer.str();
+}
+
 }  // namespace clice
diff --git a/src/Server/Scheduler.cpp b/src/Server/Scheduler.cpp
index c903edda..c41cca7e 100644
--- a/src/Server/Scheduler.cpp
+++ b/src/Server/Scheduler.cpp
@@ -7,10 +7,20 @@ namespace clice {
 void Scheduler::dispatch(std::string_view method, json::Value value) {
     if(method == "textDocument/didOpen") {
         auto params = json::deserialize<protocol::DidOpenTextDocumentParams>(value);
+        std::vector<const char*> compileArgs = {
+            "clang++",
+            "-std=c++20",
+            "main.cpp",
+            "-resource-dir=/home/ykiko/C++/clice2/build/lib/clang/20",
+        };
+        auto AST = ParsedAST::build("main.cpp", params.textDocument.text, compileArgs);
+        files[params.textDocument.uri].ast = std::move(AST);
     } else if(method == "textDocument/didChange") {
         auto params = json::deserialize<protocol::DidChangeTextDocumentParams>(value);
     } else if(method == "textDocument/semanticTokens/full") {
         auto params = json::deserialize<protocol::SemanticTokensParams>(value);
+        auto AST = files[params.textDocument.uri].ast.get();
+        
     } else {
         spdlog::error("unknown method: {}", method);
     }
diff --git a/src/Server/Server.cpp b/src/Server/Server.cpp
index 1c94f91b..0962a575 100644
--- a/src/Server/Server.cpp
+++ b/src/Server/Server.cpp
@@ -79,7 +79,7 @@ Server::Server() {
 
 auto Server::initialize(protocol::InitializeParams params) -> protocol::InitializeResult {
 
-    // instance.option.parse()
+    instance.option.parse("/home/ykiko/C++/test");
 
     return protocol::InitializeResult();
 }