[clangd] Add a callback mechanism for handling responses from client.

Summary:
The callback will be invoked in clangd when we receive a reply from the client.

This is a prerequisite of implementing a generic mechanism for chainable
refactorings (e.g. extract variable and rename), this would allow server to
trigger a new request to the LSP client after receiving a reply from the client.

Reviewers: sammccall

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D65387

llvm-svn: 367845

1 files changed, 9 insertions, 0 deletions

diff --git a/clang-tools-extra/clangd/Protocol.cpp b/clang-tools-extra/clangd/Protocol.cpp
index 0c44928d224..fb1481da5b5 100644
--- a/clang-tools-extra/clangd/Protocol.cpp
+++ b/clang-tools-extra/clangd/Protocol.cpp
@@ -670,6 +670,15 @@ llvm::json::Value toJSON(const ApplyWorkspaceEditParams &Params) {
   return llvm::json::Object{{"edit", Params.edit}};
 }
 
+bool fromJSON(const llvm::json::Value &Response,
+              ApplyWorkspaceEditResponse &R) {
+  llvm::json::ObjectMapper O(Response);
+  if (!O || !O.map("applied", R.applied))
+    return false;
+  O.map("failureReason", R.failureReason);
+  return true;
+}
+
 bool fromJSON(const llvm::json::Value &Params, TextDocumentPositionParams &R) {
   llvm::json::ObjectMapper O(Params);
   return O && O.map("textDocument", R.textDocument) &&