[clangd] Implementation of textDocument/documentSymbol

Summary:
An AST-based approach is used to retrieve the document symbols rather than an
in-memory index query. The index is not an ideal fit to achieve this because of
the file-centric query being done here whereas the index is suited for
project-wide queries. Document symbols also includes more symbols and need to
keep the order as seen in the file.

Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>

Subscribers: tomgr, ilya-biryukov, ioeric, MaskRay, jkorous, cfe-commits

Differential Revision: https://reviews.llvm.org/D47846

llvm-svn: 336386

1 files changed, 7 insertions, 0 deletions

diff --git a/clang-tools-extra/unittests/clangd/SyncAPI.cpp b/clang-tools-extra/unittests/clangd/SyncAPI.cpp
index fa4f3763c56..ae9ece59069 100644
--- a/clang-tools-extra/unittests/clangd/SyncAPI.cpp
+++ b/clang-tools-extra/unittests/clangd/SyncAPI.cpp
@@ -117,5 +117,12 @@ runWorkspaceSymbols(ClangdServer &Server, StringRef Query, int Limit) {
   return std::move(*Result);
 }
 
+llvm::Expected<std::vector<SymbolInformation>>
+runDocumentSymbols(ClangdServer &Server, PathRef File) {
+  llvm::Optional<llvm::Expected<std::vector<SymbolInformation>>> Result;
+  Server.documentSymbols(File, capture(Result));
+  return std::move(*Result);
+}
+
 } // namespace clangd
 } // namespace clang