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diff --git a/clang-tools-extra/clangd/Protocol.h b/clang-tools-extra/clangd/Protocol.h
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+//===--- Protocol.h - Language Server Protocol Implementation ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains structs based on the LSP specification at
+// https://github.com/Microsoft/language-server-protocol/blob/master/protocol.md
+//
+// This is not meant to be a complete implementation, new interfaces are added
+// when they're needed.
+//
+// Each struct has a parse and unparse function, that converts back and forth
+// between the struct and a JSON representation.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_PROTOCOL_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_PROTOCOL_H
+
+#include "llvm/ADT/Optional.h"
+#include "llvm/Support/YAMLParser.h"
+#include <string>
+
+namespace clang {
+namespace clangd {
+
+struct TextDocumentIdentifier {
+  /// The text document's URI.
+  std::string uri;
+
+  static llvm::Optional<TextDocumentIdentifier>
+  parse(llvm::yaml::MappingNode *Params);
+};
+
+struct Position {
+  /// Line position in a document (zero-based).
+  int line;
+
+  /// Character offset on a line in a document (zero-based).
+  int character;
+
+  static llvm::Optional<Position> parse(llvm::yaml::MappingNode *Params);
+  static std::string unparse(const Position &P);
+};
+
+struct Range {
+  /// The range's start position.
+  Position start;
+
+  /// The range's end position.
+  Position end;
+
+  static llvm::Optional<Range> parse(llvm::yaml::MappingNode *Params);
+  static std::string unparse(const Range &P);
+};
+
+struct TextEdit {
+  /// The range of the text document to be manipulated. To insert
+  /// text into a document create a range where start === end.
+  Range range;
+
+  /// The string to be inserted. For delete operations use an
+  /// empty string.
+  std::string newText;
+
+  static llvm::Optional<TextEdit> parse(llvm::yaml::MappingNode *Params);
+  static std::string unparse(const TextEdit &P);
+};
+
+struct TextDocumentItem {
+  /// The text document's URI.
+  std::string uri;
+
+  /// The text document's language identifier.
+  std::string languageId;
+
+  /// The version number of this document (it will strictly increase after each
+  int version;
+
+  /// The content of the opened text document.
+  std::string text;
+
+  static llvm::Optional<TextDocumentItem>
+  parse(llvm::yaml::MappingNode *Params);
+};
+
+struct DidOpenTextDocumentParams {
+  /// The document that was opened.
+  TextDocumentItem textDocument;
+
+  static llvm::Optional<DidOpenTextDocumentParams>
+  parse(llvm::yaml::MappingNode *Params);
+};
+
+struct TextDocumentContentChangeEvent {
+  /// The new text of the document.
+  std::string text;
+
+  static llvm::Optional<TextDocumentContentChangeEvent>
+  parse(llvm::yaml::MappingNode *Params);
+};
+
+struct DidChangeTextDocumentParams {
+  /// The document that did change. The version number points
+  /// to the version after all provided content changes have
+  /// been applied.
+  TextDocumentIdentifier textDocument;
+
+  /// The actual content changes.
+  std::vector<TextDocumentContentChangeEvent> contentChanges;
+
+  static llvm::Optional<DidChangeTextDocumentParams>
+  parse(llvm::yaml::MappingNode *Params);
+};
+
+struct FormattingOptions {
+  /// Size of a tab in spaces.
+  int tabSize;
+
+  /// Prefer spaces over tabs.
+  bool insertSpaces;
+
+  static llvm::Optional<FormattingOptions>
+  parse(llvm::yaml::MappingNode *Params);
+  static std::string unparse(const FormattingOptions &P);
+};
+
+struct DocumentRangeFormattingParams {
+  /// The document to format.
+  TextDocumentIdentifier textDocument;
+
+  /// The range to format
+  Range range;
+
+  /// The format options
+  FormattingOptions options;
+
+  static llvm::Optional<DocumentRangeFormattingParams>
+  parse(llvm::yaml::MappingNode *Params);
+};
+
+struct DocumentFormattingParams {
+  /// The document to format.
+  TextDocumentIdentifier textDocument;
+
+  /// The format options
+  FormattingOptions options;
+
+  static llvm::Optional<DocumentFormattingParams>
+  parse(llvm::yaml::MappingNode *Params);
+};
+
+} // namespace clangd
+} // namespace clang
+
+#endif