1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
//===--- JSONRPCDispatcher.h - Main JSON parser entry point -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_JSONRPCDISPATCHER_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_JSONRPCDISPATCHER_H
#include "Context.h"
#include "JSONExpr.h"
#include "Logger.h"
#include "Protocol.h"
#include "Trace.h"
#include "clang/Basic/LLVM.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringMap.h"
#include <iosfwd>
#include <mutex>
namespace clang {
namespace clangd {
/// Encapsulates output and logs streams and provides thread-safe access to
/// them.
class JSONOutput : public Logger {
// FIXME(ibiryukov): figure out if we can shrink the public interface of
// JSONOutput now that we pass Context everywhere.
public:
JSONOutput(llvm::raw_ostream &Outs, llvm::raw_ostream &Logs,
llvm::raw_ostream *InputMirror = nullptr, bool Pretty = false)
: Pretty(Pretty), Outs(Outs), Logs(Logs), InputMirror(InputMirror) {}
/// Emit a JSONRPC message.
void writeMessage(const json::Expr &Result);
/// Write a line to the logging stream.
void log(const Context &Ctx, const Twine &Message) override;
/// Mirror \p Message into InputMirror stream. Does nothing if InputMirror is
/// null.
/// Unlike other methods of JSONOutput, mirrorInput is not thread-safe.
void mirrorInput(const Twine &Message);
// Whether output should be pretty-printed.
const bool Pretty;
private:
llvm::raw_ostream &Outs;
llvm::raw_ostream &Logs;
llvm::raw_ostream *InputMirror;
std::mutex StreamMutex;
};
/// Sends a successful reply. \p Ctx must either be the Context accepted by
/// JSONRPCDispatcher::Handler or be derived from it.
void reply(const Context &Ctx, json::Expr &&Result);
/// Sends an error response to the client, and logs it. \p Ctx must either be
/// the Context accepted by JSONRPCDispatcher::Handler or be derived from it.
void replyError(const Context &Ctx, ErrorCode code,
const llvm::StringRef &Message);
/// Sends a request to the client. \p Ctx must either be the Context accepted by
/// JSONRPCDispatcher::Handler or be derived from it.
void call(const Context &Ctx, llvm::StringRef Method, json::Expr &&Params);
/// Main JSONRPC entry point. This parses the JSONRPC "header" and calls the
/// registered Handler for the method received.
class JSONRPCDispatcher {
public:
// A handler responds to requests for a particular method name.
using Handler = std::function<void(Context, const json::Expr &)>;
/// Create a new JSONRPCDispatcher. UnknownHandler is called when an unknown
/// method is received.
JSONRPCDispatcher(Handler UnknownHandler)
: UnknownHandler(std::move(UnknownHandler)) {}
/// Registers a Handler for the specified Method.
void registerHandler(StringRef Method, Handler H);
/// Parses a JSONRPC message and calls the Handler for it.
bool call(const json::Expr &Message, JSONOutput &Out) const;
private:
llvm::StringMap<Handler> Handlers;
Handler UnknownHandler;
};
/// Parses input queries from LSP client (coming from \p In) and runs call
/// method of \p Dispatcher for each query.
/// After handling each query checks if \p IsDone is set true and exits the loop
/// if it is.
/// Input stream(\p In) must be opened in binary mode to avoid preliminary
/// replacements of \r\n with \n.
void runLanguageServerLoop(std::istream &In, JSONOutput &Out,
JSONRPCDispatcher &Dispatcher, bool &IsDone);
} // namespace clangd
} // namespace clang
#endif
|
