Make Reader/Writer abstract classes instead of type aliases of rapidjson classes

Added src/serializers/json.h (which includes rapidjson)

src/language_server_api.cc

@@ -1,5 +1,7 @@
 #include "language_server_api.h"
 
+#include "serializers/json.h"
+
 #include <doctest/doctest.h>
 #include <loguru.hpp>
 
@@ -155,12 +157,13 @@ std::unique_ptr<BaseIpcMessage> MessageRegistry::ReadMessageFromStdin(
   document.Parse(content->c_str(), content->length());
   assert(!document.HasParseError());
 
-  return Parse(document);
+  JsonReader json_reader{&document};
+  return Parse(json_reader);
 }
 
 std::unique_ptr<BaseIpcMessage> MessageRegistry::Parse(Reader& visitor) {
   if (!visitor.HasMember("jsonrpc") ||
-      std::string(visitor["jsonrpc"].GetString()) != "2.0") {
+      std::string(visitor["jsonrpc"]->GetString()) != "2.0") {
     LOG_S(FATAL) << "Bad or missing jsonrpc version";
     exit(1);
   }

src/language_server_api.h

@@ -3,6 +3,7 @@
 #include "config.h"
 #include "ipc.h"
 #include "serializer.h"
+#include "serializers/json.h"
 #include "utils.h"
 
 #include <optional.h>
@@ -79,9 +80,10 @@ struct lsOutMessage : lsBaseOutMessage {
   // Send the message to the language client by writing it to stdout.
   void Write(std::ostream& out) override {
     rapidjson::StringBuffer output;
-    Writer writer(output);
+    rapidjson::Writer<rapidjson::StringBuffer> writer(output);
+    JsonWriter json_writer(&writer);
     auto that = static_cast<TDerived*>(this);
-    Reflect(writer, *that);
+    Reflect(json_writer, *that);
 
     out << "Content-Length: " << output.GetSize();
     out << (char)13 << char(10) << char(13) << char(10);  // CRLFCRLF

src/messages/initialize.cc

@@ -4,6 +4,7 @@
 #include "platform.h"
 #include "project.h"
 #include "queue_manager.h"
+#include "serializers/json.h"
 #include "timer.h"
 #include "working_files.h"
 
@@ -42,8 +43,9 @@ struct InitializeHandler : BaseMessageHandler<Ipc_InitializeRequest> {
   void Run(Ipc_InitializeRequest* request) override {
     // Log initialization parameters.
     rapidjson::StringBuffer output;
-    Writer writer(output);
-    Reflect(writer, request->params.initializationOptions);
+    rapidjson::Writer<rapidjson::StringBuffer> writer(output);
+    JsonWriter json_writer(&writer);
+    Reflect(json_writer, request->params.initializationOptions);
     LOG_S(INFO) << "Init parameters: " << output.GetString();
 
     if (request->params.rootUri) {

src/position.cc

@@ -153,7 +153,7 @@ void Reflect(Reader& visitor, Position& value) {
 }
 void Reflect(Writer& visitor, Position& value) {
   std::string output = value.ToString();
-  visitor.String(output.c_str(), (rapidjson::SizeType)output.size());
+  visitor.String(output.c_str(), output.size());
 }
 
 // Range
@@ -165,5 +165,5 @@ void Reflect(Reader& visitor, Range& value) {
 }
 void Reflect(Writer& visitor, Range& value) {
   std::string output = value.ToString();
-  visitor.String(output.c_str(), (rapidjson::SizeType)output.size());
-}
+  visitor.String(output.c_str(), output.size());
+}

src/query.cc

@@ -1,6 +1,7 @@
 #include "query.h"
 
 #include "indexer.h"
+#include "serializers/json.h"
 
 #include <doctest/doctest.h>
 #include <optional.h>
@@ -674,9 +675,10 @@ void IndexUpdate::Merge(const IndexUpdate& update) {
 
 std::string IndexUpdate::ToString() {
   rapidjson::StringBuffer output;
-  Writer writer(output);
+  rapidjson::Writer<rapidjson::StringBuffer> writer;
+  JsonWriter json_writer(&writer);
   IndexUpdate& update = *this;
-  Reflect(writer, update);
+  Reflect(json_writer, update);
   return output.GetString();
 }
 

src/serializer.cc

@@ -1,5 +1,8 @@
 #include "serializer.h"
 
+// TODO Move Json* to serializers/json.cc
+#include "serializers/json.h"
+
 #include "indexer.h"
 
 #include <doctest/doctest.h>
@@ -195,12 +198,12 @@ void Reflect(TVisitor& visitor, IndexFile& value) {
 std::string Serialize(IndexFile& file) {
   rapidjson::StringBuffer output;
   rapidjson::PrettyWriter<rapidjson::StringBuffer> writer(output);
-  // Writer writer(output);
   writer.SetFormatOptions(
       rapidjson::PrettyFormatOptions::kFormatSingleLineArray);
   writer.SetIndent(' ', 2);
 
-  Reflect(writer, file);
+  JsonWriter json_writer(&writer);
+  Reflect(json_writer, file);
 
   return output.GetString();
 }
@@ -224,7 +227,8 @@ std::unique_ptr<IndexFile> Deserialize(std::string path,
   }
 
   auto file = MakeUnique<IndexFile>(path);
-  Reflect(reader, *file);
+  JsonReader json_reader{&reader};
+  Reflect(json_reader, *file);
 
   // Restore non-serialized state.
   file->path = path;

src/serializer.h

@@ -3,15 +3,54 @@
 #include <macro_map.h>
 #include <optional.h>
 #include <variant.h>
-#include <rapidjson/document.h>
-#include <rapidjson/prettywriter.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
-using Reader = rapidjson::GenericValue<rapidjson::UTF8<>>;
-using Writer = rapidjson::Writer<rapidjson::StringBuffer>;
+class Reader {
+ public:
+  virtual ~Reader() {}
+
+  virtual bool IsBool() = 0;
+  virtual bool IsNull() = 0;
+  virtual bool IsArray() = 0;
+  virtual bool IsInt() = 0;
+  virtual bool IsInt64() = 0;
+  virtual bool IsUint64() = 0;
+  virtual bool IsString() = 0;
+
+  virtual bool GetBool() = 0;
+  virtual int GetInt() = 0;
+  virtual int64_t GetInt64() = 0;
+  virtual uint64_t GetUint64() = 0;
+  virtual const char* GetString() = 0;
+
+  virtual bool HasMember(const char* x) = 0;
+  virtual std::unique_ptr<Reader> operator[](const char* x) = 0;
+
+  virtual void IterArray(std::function<void(Reader&)> fn) = 0;
+  virtual void DoMember(const char* name, std::function<void(Reader&)> fn) = 0;
+};
+
+class Writer {
+ public:
+  virtual ~Writer() {}
+
+  virtual void Null() = 0;
+  virtual void Bool(bool x) = 0;
+  virtual void Int(uint64_t x) = 0;
+  virtual void Int64(uint64_t x) = 0;
+  virtual void Uint64(uint64_t x) = 0;
+  virtual void String(const char* x) = 0;
+  virtual void String(const char* x, size_t len) = 0;
+  virtual void StartArray() = 0;
+  virtual void EndArray() = 0;
+  virtual void StartObject() = 0;
+  virtual void EndObject() = 0;
+  virtual void Key(const char* name) = 0;
+};
+
 struct IndexFile;
 
 #define REFLECT_MEMBER_START()             \
@@ -131,11 +170,11 @@ template <typename T>
 void Reflect(Reader& visitor, std::vector<T>& values) {
   if (!visitor.IsArray())
     return;
-  for (auto& entry : visitor.GetArray()) {
+  visitor.IterArray([&](Reader& entry) {
     T entry_value;
     Reflect(entry, entry_value);
     values.push_back(entry_value);
-  }
+  });
 }
 template <typename T>
 void Reflect(Writer& visitor, std::vector<T>& values) {
@@ -193,11 +232,7 @@ template <typename T>
 void ReflectMemberEnd(Reader& visitor, T& value) {}
 template <typename T>
 void ReflectMember(Reader& visitor, const char* name, T& value) {
-  auto it = visitor.FindMember(name);
-  if (it != visitor.MemberEnd()) {
-    Reader& child_visitor = it->value;
-    Reflect(child_visitor, value);
-  }
+  visitor.DoMember(name, [&](Reader& child) { Reflect(child, value); });
 }
 
 std::string Serialize(IndexFile& file);