v1.1 semantic highlight feature, introduced in specification 3.16.0

CMakeLists.txt

@@ -235,6 +235,7 @@ target_sources(ccls PRIVATE
   src/messages/textDocument_hover.cc
   src/messages/textDocument_references.cc
   src/messages/textDocument_rename.cc
+  src/messages/textDocument_semanticToken.cc
   src/messages/textDocument_signatureHelp.cc
   src/messages/workspace.cc
 )

src/message_handler.cc

@@ -188,6 +188,8 @@ MessageHandler::MessageHandler() {
   bind("textDocument/rename", &MessageHandler::textDocument_rename);
   bind("textDocument/signatureHelp", &MessageHandler::textDocument_signatureHelp);
   bind("textDocument/typeDefinition", &MessageHandler::textDocument_typeDefinition);
+  bind("textDocument/semanticTokens/full", &MessageHandler::textDocument_semanticTokensFull);
+  bind("textDocument/semanticTokens/range", &MessageHandler::textDocument_semanticTokensRange);
   bind("workspace/didChangeConfiguration", &MessageHandler::workspace_didChangeConfiguration);
   bind("workspace/didChangeWatchedFiles", &MessageHandler::workspace_didChangeWatchedFiles);
   bind("workspace/didChangeWorkspaceFolders", &MessageHandler::workspace_didChangeWorkspaceFolders);

src/message_handler.hh

@@ -48,6 +48,15 @@ struct TextDocumentPositionParam {
   TextDocumentIdentifier textDocument;
   Position position;
 };
+struct SemanticTokensParams {
+  TextDocumentIdentifier textDocument;
+};
+REFLECT_STRUCT(SemanticTokensParams, textDocument);
+struct SemanticTokensRangeParams {
+  TextDocumentIdentifier textDocument;
+  lsRange range;
+};
+REFLECT_STRUCT(SemanticTokensRangeParams, textDocument, range);
 struct TextDocumentEdit {
   VersionedTextDocumentIdentifier textDocument;
   std::vector<TextEdit> edits;
@@ -287,6 +296,8 @@ private:
   void textDocument_rename(RenameParam &, ReplyOnce &);
   void textDocument_signatureHelp(TextDocumentPositionParam &, ReplyOnce &);
   void textDocument_typeDefinition(TextDocumentPositionParam &, ReplyOnce &);
+  void textDocument_semanticTokensFull(SemanticTokensParams &, ReplyOnce &);
+  void textDocument_semanticTokensRange(SemanticTokensRangeParams &, ReplyOnce &);
   void workspace_didChangeConfiguration(EmptyParam &);
   void workspace_didChangeWatchedFiles(DidChangeWatchedFilesParam &);
   void workspace_didChangeWorkspaceFolders(DidChangeWorkspaceFoldersParam &);

src/messages/initialize.cc

@@ -25,6 +25,47 @@
 namespace ccls {
 using namespace llvm;
 
+std::vector<const char *> SEMANTIC_TOKENS = {
+  "unknown",
+
+  "file",
+  "module",
+  "namespace",
+  "package",
+  "class",
+  "method",
+  "property",
+  "field",
+  "constructor",
+  "enum",
+  "interface",
+  "function",
+  "variable",
+  "constant",
+  "string",
+  "number",
+  "boolean",
+  "array",
+  "object",
+  "key",
+  "null",
+  "enumMember",
+  "struct",
+  "event",
+  "operator",
+  "typeParameter",
+  "typeAlias", //252 => 27
+  "parameter",
+  "staticMethod",
+  "macro"
+};
+
+std::vector<const char *> SEMANTIC_MODIFIERS = {
+    "declaration", //1
+    "definition",  //2
+    "static"       //4
+};
+
 extern std::vector<std::string> g_init_options;
 
 namespace {
@@ -89,6 +130,14 @@ struct ServerCap {
     std::vector<const char *> commands = {ccls_xref};
   } executeCommandProvider;
   Config::ServerCap::Workspace workspace;
+  struct SemanticTokenProvider {
+      struct SemanticTokensLegend {
+          std::vector<const char *> tokenTypes = SEMANTIC_TOKENS;
+          std::vector<const char *> tokenModifiers = SEMANTIC_MODIFIERS;
+      } legend;
+      bool range = true;
+      bool full = true;
+  } semanticTokensProvider;
 };
 REFLECT_STRUCT(ServerCap::CodeActionOptions, codeActionKinds);
 REFLECT_STRUCT(ServerCap::CodeLensOptions, resolveProvider);
@@ -109,7 +158,9 @@ REFLECT_STRUCT(ServerCap, textDocumentSync, hoverProvider, completionProvider,
                documentRangeFormattingProvider,
                documentOnTypeFormattingProvider, renameProvider,
                documentLinkProvider, foldingRangeProvider,
-               executeCommandProvider, workspace);
+               executeCommandProvider, workspace, semanticTokensProvider);
+REFLECT_STRUCT(ServerCap::SemanticTokenProvider, legend, range, full);
+REFLECT_STRUCT(ServerCap::SemanticTokenProvider::SemanticTokensLegend, tokenTypes, tokenModifiers);
 
 struct DynamicReg {
   bool dynamicRegistration = false;