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Revert "Switch from json11 to nlohmann/json (#31093)" 

This reverts commit 8fa1e8aa53defca264272a66531d639b3d569418.

old-commit-hash: 88757c12b3
This commit is contained in:
Adeeb Shihadeh 2024-01-22 22:41:59 -08:00
parent cb3a834067
commit 12d2d861f2
17 changed files with 1098 additions and 76 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
.gitattributes vendored
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@ -21,7 +21,6 @@ third_party/acados/*/t_renderer filter=lfs diff=lfs merge=lfs -text
third_party/qt5/larch64/bin/lrelease filter=lfs diff=lfs merge=lfs -text
third_party/qt5/larch64/bin/lupdate filter=lfs diff=lfs merge=lfs -text
third_party/catch2/include/catch2/catch.hpp filter=lfs diff=lfs merge=lfs -text
third_party/nlohmann/json.hpp filter=lfs diff=lfs merge=lfs -text
*.ico filter=lfs diff=lfs merge=lfs -text
*.apk filter=lfs diff=lfs merge=lfs -text
*.apkpatch filter=lfs diff=lfs merge=lfs -text

4
SConstruct
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@ -205,7 +205,7 @@ env = Environment(
"#third_party/acados/include/hpipm/include",
"#third_party/catch2/include",
"#third_party/libyuv/include",
"#third_party/nlohmann",
"#third_party/json11",
"#third_party/linux/include",
"#third_party/snpe/include",
"#third_party/mapbox-gl-native-qt/include",
@ -351,7 +351,7 @@ Export('env', 'qt_env', 'arch', 'real_arch')
SConscript(['common/SConscript'])
Import('_common', '_gpucommon')
common = [_common]
common = [_common, 'json11']
gpucommon = [_gpucommon]
Export('common', 'gpucommon')

6
common/SConscript
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@ -12,7 +12,7 @@ common_libs = [
if arch != "Darwin":
common_libs.append('gpio.cc')
_common = env.Library('common', common_libs)
_common = env.Library('common', common_libs, LIBS="json11")
files = [
'clutil.cc',
@ -24,10 +24,10 @@ Export('_common', '_gpucommon')
if GetOption('extras'):
env.Program('tests/test_common',
['tests/test_runner.cc', 'tests/test_params.cc', 'tests/test_util.cc', 'tests/test_swaglog.cc'],
LIBS=[_common, 'zmq', 'pthread'])
LIBS=[_common, 'json11', 'zmq', 'pthread'])
# Cython bindings
params_python = envCython.Program('params_pyx.so', 'params_pyx.pyx', LIBS=envCython['LIBS'] + [_common, 'zmq'])
params_python = envCython.Program('params_pyx.so', 'params_pyx.pyx', LIBS=envCython['LIBS'] + [_common, 'zmq', 'json11'])
SConscript([
'transformations/SConscript',

16
common/swaglog.cc
View File

@ -11,7 +11,7 @@
#include <zmq.h>
#include <stdarg.h>
#include "nlohmann/json.hpp"
#include "third_party/json11/json11.hpp"
#include "common/version.h"
#include "system/hardware/hw.h"
@ -37,7 +37,7 @@ public:
}
}
ctx_j = nlohmann::json();
ctx_j = json11::Json::object{};
if (char* dongle_id = getenv("DONGLE_ID")) {
ctx_j["dongle_id"] = dongle_id;
}
@ -66,17 +66,17 @@ public:
void* zctx = nullptr;
void* sock = nullptr;
int print_level;
nlohmann::json ctx_j;
json11::Json::object ctx_j;
};
bool LOG_TIMESTAMPS = getenv("LOG_TIMESTAMPS");
uint32_t NO_FRAME_ID = std::numeric_limits<uint32_t>::max();
static void cloudlog_common(int levelnum, const char* filename, int lineno, const char* func,
char* msg_buf, const nlohmann::json &msg_j={}) {
char* msg_buf, const json11::Json::object &msg_j={}) {
static SwaglogState s;
nlohmann::json log_j = nlohmann::json {
json11::Json::object log_j = json11::Json::object {
{"ctx", s.ctx_j},
{"levelnum", levelnum},
{"filename", filename},
@ -92,7 +92,7 @@ static void cloudlog_common(int levelnum, const char* filename, int lineno, cons
std::string log_s;
log_s += (char)levelnum;
log_s += log_j.dump();
((json11::Json)log_j).dump(log_s);
s.log(levelnum, filename, lineno, func, msg_buf, log_s);
free(msg_buf);
@ -115,14 +115,14 @@ void cloudlog_t_common(int levelnum, const char* filename, int lineno, const cha
char* msg_buf = nullptr;
int ret = vasprintf(&msg_buf, fmt, args);
if (ret <= 0 || !msg_buf) return;
nlohmann::json tspt_j = nlohmann::json{
json11::Json::object tspt_j = json11::Json::object{
{"event", msg_buf},
{"time", std::to_string(nanos_since_boot())}
};
if (frame_id < NO_FRAME_ID) {
tspt_j["frame_id"] = std::to_string(frame_id);
}
tspt_j = nlohmann::json{{"timestamp", tspt_j}};
tspt_j = json11::Json::object{{"timestamp", tspt_j}};
cloudlog_common(levelnum, filename, lineno, func, msg_buf, tspt_j);
}

25
common/tests/test_swaglog.cc
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@ -7,7 +7,7 @@
#include "common/util.h"
#include "common/version.h"
#include "system/hardware/hw.h"
#include "nlohmann/json.hpp"
#include "third_party/json11/json11.hpp"
std::string daemon_name = "testy";
std::string dongle_id = "test_dongle_id";
@ -39,25 +39,26 @@ void recv_log(int thread_cnt, int thread_msg_cnt) {
REQUIRE(buf[0] == CLOUDLOG_DEBUG);
std::string err;
nlohmann::json msg = nlohmann::json::parse(buf + 1);
auto msg = json11::Json::parse(buf + 1, err);
REQUIRE(!msg.is_null());
REQUIRE(msg["levelnum"].template get<int>() == CLOUDLOG_DEBUG);
REQUIRE_THAT(msg["filename"].template get<std::string>(), Catch::Contains("test_swaglog.cc"));
REQUIRE(msg["funcname"].template get<std::string>() == "log_thread");
REQUIRE(msg["lineno"].template get<int>() == LINE_NO);
REQUIRE(msg["levelnum"].int_value() == CLOUDLOG_DEBUG);
REQUIRE_THAT(msg["filename"].string_value(), Catch::Contains("test_swaglog.cc"));
REQUIRE(msg["funcname"].string_value() == "log_thread");
REQUIRE(msg["lineno"].int_value() == LINE_NO);
auto ctx = msg["ctx"];
REQUIRE(ctx["daemon"].template get<std::string>() == daemon_name);
REQUIRE(ctx["dongle_id"].template get<std::string>() == dongle_id);
REQUIRE(ctx["dirty"].template get<bool>() == true);
REQUIRE(ctx["daemon"].string_value() == daemon_name);
REQUIRE(ctx["dongle_id"].string_value() == dongle_id);
REQUIRE(ctx["dirty"].bool_value() == true);
REQUIRE(ctx["version"].template get<std::string>() == COMMA_VERSION);
REQUIRE(ctx["version"].string_value() == COMMA_VERSION);
std::string device = Hardware::get_name();
REQUIRE(ctx["device"].template get<std::string>() == device);
REQUIRE(ctx["device"].string_value() == device);
int thread_id = atoi(msg["msg"].template get<std::string>().c_str());
int thread_id = atoi(msg["msg"].string_value().c_str());
REQUIRE((thread_id >= 0 && thread_id < thread_cnt));
thread_msgs[thread_id]++;
total_count++;

3
release/files_common
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@ -374,7 +374,8 @@ third_party/SConscript
third_party/linux/**
third_party/opencl/**
third_party/nlohmann/json.hpp
third_party/json11/json11.cpp
third_party/json11/json11.hpp
third_party/qrcode/*.cc
third_party/qrcode/*.hpp

79
selfdrive/modeld/thneed/serialize.cc
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@ -1,11 +1,11 @@
#include <cassert>
#include <set>
#include "nlohmann/json.hpp"
#include "third_party/json11/json11.hpp"
#include "common/util.h"
#include "common/clutil.h"
#include "selfdrive/modeld/thneed/thneed.h"
using namespace nlohmann;
using namespace json11;
extern map<cl_program, string> g_program_source;
@ -14,24 +14,25 @@ void Thneed::load(const char *filename) {
string buf = util::read_file(filename);
int jsz = *(int *)buf.data();
string jsonerr;
string jj(buf.data() + sizeof(int), jsz);
json jdat = json::parse(jj);
Json jdat = Json::parse(jj, jsonerr);
map<cl_mem, cl_mem> real_mem;
real_mem[NULL] = NULL;
int ptr = sizeof(int)+jsz;
for (auto &obj : jdat["objects"]) {
auto mobj = obj;
int sz = mobj["size"].template get<int>();
for (auto &obj : jdat["objects"].array_items()) {
auto mobj = obj.object_items();
int sz = mobj["size"].int_value();
cl_mem clbuf = NULL;
if (mobj["buffer_id"].template get<std::string>().size() > 0) {
if (mobj["buffer_id"].string_value().size() > 0) {
// image buffer must already be allocated
clbuf = real_mem[*(cl_mem*)(mobj["buffer_id"].template get<std::string>().data())];
assert(mobj["needs_load"].template get<bool>() == false);
clbuf = real_mem[*(cl_mem*)(mobj["buffer_id"].string_value().data())];
assert(mobj["needs_load"].bool_value() == false);
} else {
if (mobj["needs_load"].template get<bool>()) {
if (mobj["needs_load"].bool_value()) {
clbuf = clCreateBuffer(context, CL_MEM_COPY_HOST_PTR | CL_MEM_READ_WRITE, sz, &buf[ptr], NULL);
if (debug >= 1) printf("loading %p %d @ 0x%X\n", clbuf, sz, ptr);
ptr += sz;
@ -47,9 +48,9 @@ void Thneed::load(const char *filename) {
if (mobj["arg_type"] == "image2d_t" || mobj["arg_type"] == "image1d_t") {
cl_image_desc desc = {0};
desc.image_type = (mobj["arg_type"] == "image2d_t") ? CL_MEM_OBJECT_IMAGE2D : CL_MEM_OBJECT_IMAGE1D_BUFFER;
desc.image_width = mobj["width"].template get<int>();
desc.image_height = mobj["height"].template get<int>();
desc.image_row_pitch = mobj["row_pitch"].template get<int>();
desc.image_width = mobj["width"].int_value();
desc.image_height = mobj["height"].int_value();
desc.image_row_pitch = mobj["row_pitch"].int_value();
assert(sz == desc.image_height*desc.image_row_pitch);
#ifdef QCOM2
desc.buffer = clbuf;
@ -59,12 +60,12 @@ void Thneed::load(const char *filename) {
#endif
cl_image_format format = {0};
format.image_channel_order = CL_RGBA;
format.image_channel_data_type = mobj["float32"].template get<bool>() ? CL_FLOAT : CL_HALF_FLOAT;
format.image_channel_data_type = mobj["float32"].bool_value() ? CL_FLOAT : CL_HALF_FLOAT;
cl_int errcode;
#ifndef QCOM2
if (mobj["needs_load"].template get<bool>()) {
if (mobj["needs_load"].bool_value()) {
clbuf = clCreateImage(context, CL_MEM_COPY_HOST_PTR | CL_MEM_READ_WRITE, &format, &desc, &buf[ptr-sz], &errcode);
} else {
clbuf = clCreateImage(context, CL_MEM_READ_WRITE, &format, &desc, NULL, &errcode);
@ -79,22 +80,22 @@ void Thneed::load(const char *filename) {
assert(clbuf != NULL);
}
real_mem[*(cl_mem*)(mobj["id"].template get<std::string>().data())] = clbuf;
real_mem[*(cl_mem*)(mobj["id"].string_value().data())] = clbuf;
}
map<string, cl_program> g_programs;
for (const auto &[name, source] : jdat["programs"].items()) {
if (debug >= 1) printf("building %s with size %zu\n", name.c_str(), source.template get<std::string>().size());
g_programs[name] = cl_program_from_source(context, device_id, source.template get<std::string>());
for (const auto &[name, source] : jdat["programs"].object_items()) {
if (debug >= 1) printf("building %s with size %zu\n", name.c_str(), source.string_value().size());
g_programs[name] = cl_program_from_source(context, device_id, source.string_value());
}
for (auto &obj : jdat["inputs"]) {
auto mobj = obj;
int sz = mobj["size"].template get<int>();
cl_mem aa = real_mem[*(cl_mem*)(mobj["buffer_id"].template get<std::string>().data())];
for (auto &obj : jdat["inputs"].array_items()) {
auto mobj = obj.object_items();
int sz = mobj["size"].int_value();
cl_mem aa = real_mem[*(cl_mem*)(mobj["buffer_id"].string_value().data())];
input_clmem.push_back(aa);
input_sizes.push_back(sz);
printf("Thneed::load: adding input %s with size %d\n", mobj["name"].template get<std::string>().data(), sz);
printf("Thneed::load: adding input %s with size %d\n", mobj["name"].string_value().data(), sz);
cl_int cl_err;
void *ret = clEnqueueMapBuffer(command_queue, aa, CL_TRUE, CL_MAP_WRITE, 0, sz, 0, NULL, NULL, &cl_err);
@ -103,39 +104,39 @@ void Thneed::load(const char *filename) {
inputs.push_back(ret);
}
for (auto &obj : jdat["outputs"]) {
auto mobj = obj;
int sz = mobj["size"].template get<int>();
for (auto &obj : jdat["outputs"].array_items()) {
auto mobj = obj.object_items();
int sz = mobj["size"].int_value();
printf("Thneed::save: adding output with size %d\n", sz);
// TODO: support multiple outputs
output = real_mem[*(cl_mem*)(mobj["buffer_id"].template get<std::string>().data())];
output = real_mem[*(cl_mem*)(mobj["buffer_id"].string_value().data())];
assert(output != NULL);
}
for (auto &obj : jdat["binaries"]) {
string name = obj["name"].template get<std::string>();
size_t length = obj["length"].template get<int>();
for (auto &obj : jdat["binaries"].array_items()) {
string name = obj["name"].string_value();
size_t length = obj["length"].int_value();
if (debug >= 1) printf("binary %s with size %zu\n", name.c_str(), length);
g_programs[name] = cl_program_from_binary(context, device_id, (const uint8_t*)&buf[ptr], length);
ptr += length;
}
for (auto &obj : jdat["kernels"]) {
for (auto &obj : jdat["kernels"].array_items()) {
auto gws = obj["global_work_size"];
auto lws = obj["local_work_size"];
auto kk = shared_ptr<CLQueuedKernel>(new CLQueuedKernel(this));
kk->name = obj["name"].template get<std::string>();
kk->name = obj["name"].string_value();
kk->program = g_programs[kk->name];
kk->work_dim = obj["work_dim"].template get<int>();
kk->work_dim = obj["work_dim"].int_value();
for (int i = 0; i < kk->work_dim; i++) {
kk->global_work_size[i] = gws[i].template get<int>();
kk->local_work_size[i] = lws[i].template get<int>();
kk->global_work_size[i] = gws[i].int_value();
kk->local_work_size[i] = lws[i].int_value();
}
kk->num_args = obj["num_args"].template get<int>();
kk->num_args = obj["num_args"].int_value();
for (int i = 0; i < kk->num_args; i++) {
string arg = obj["args"][i].template get<std::string>();
int arg_size = obj["args_size"][i].template get<int>();
string arg = obj["args"].array_items()[i].string_value();
int arg_size = obj["args_size"].array_items()[i].int_value();
kk->args_size.push_back(arg_size);
if (arg_size == 8) {
cl_mem val = *(cl_mem*)(arg.data());

4
selfdrive/modeld/thneed/thneed.h
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@ -18,6 +18,9 @@ using namespace std;
cl_int thneed_clSetKernelArg(cl_kernel kernel, cl_uint arg_index, size_t arg_size, const void *arg_value);
namespace json11 {
class Json;
}
class Thneed;
class GPUMalloc {
@ -49,6 +52,7 @@ class CLQueuedKernel {
vector<string> args;
vector<int> args_size;
cl_kernel kernel = NULL;
json11::Json to_json() const;
cl_uint work_dim;
size_t global_work_size[3] = {0};

2
selfdrive/navd/SConscript
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@ -2,7 +2,7 @@ Import('qt_env', 'arch', 'common', 'messaging', 'visionipc', 'cereal', 'transfor
map_env = qt_env.Clone()
libs = ['qt_widgets', 'qt_util', 'qmapboxgl', common, messaging, cereal, visionipc, transformations,
'zmq', 'capnp', 'kj', 'm', 'OpenCL', 'ssl', 'crypto', 'pthread'] + map_env["LIBS"]
'zmq', 'capnp', 'kj', 'm', 'OpenCL', 'ssl', 'crypto', 'pthread', 'json11'] + map_env["LIBS"]
if arch == 'larch64':
libs.append(':libEGL_mesa.so.0')

4
selfdrive/ui/SConscript
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@ -91,7 +91,7 @@ if GetOption('extras') and arch != "Darwin":
# setup and factory resetter
qt_env.Program("qt/setup/reset", ["qt/setup/reset.cc"], LIBS=qt_libs)
qt_env.Program("qt/setup/setup", ["qt/setup/setup.cc", asset_obj],
LIBS=qt_libs + ['curl', 'common'])
LIBS=qt_libs + ['curl', 'common', 'json11'])
# build updater UI
qt_env.Program("qt/setup/updater", ["qt/setup/updater.cc", asset_obj], LIBS=qt_libs)
@ -126,4 +126,4 @@ if GetOption('extras') and arch != "Darwin":
# build watch3
if arch in ['x86_64', 'aarch64', 'Darwin'] or GetOption('extras'):
qt_env.Program("watch3", ["watch3.cc"], LIBS=qt_libs + ['common', 'zmq', 'visionipc', 'messaging'])
qt_env.Program("watch3", ["watch3.cc"], LIBS=qt_libs + ['common', 'json11', 'zmq', 'visionipc', 'messaging'])

2
system/logcatd/SConscript
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@ -1,3 +1,3 @@
Import('env', 'cereal', 'messaging', 'common')
env.Program('logcatd', 'logcatd_systemd.cc', LIBS=[cereal, messaging, common, 'zmq', 'capnp', 'kj', 'systemd'])
env.Program('logcatd', 'logcatd_systemd.cc', LIBS=[cereal, messaging, common, 'zmq', 'capnp', 'kj', 'systemd', 'json11'])

4
system/logcatd/logcatd_systemd.cc
View File

@ -5,7 +5,7 @@
#include <map>
#include <string>
#include "nlohmann/json.hpp"
#include "third_party/json11/json11.hpp"
#include "cereal/messaging/messaging.h"
#include "common/timing.h"
@ -62,7 +62,7 @@ int main(int argc, char *argv[]) {
// Build message
auto androidEntry = msg.initEvent().initAndroidLog();
androidEntry.setTs(timestamp);
androidEntry.setMessage(nlohmann::json(kv).dump());
androidEntry.setMessage(json11::Json(kv).dump());
if (kv.count("_PID")) androidEntry.setPid(std::atoi(kv["_PID"].c_str()));
if (kv.count("PRIORITY")) androidEntry.setPriority(std::atoi(kv["PRIORITY"].c_str()));
if (kv.count("SYSLOG_IDENTIFIER")) androidEntry.setTag(kv["SYSLOG_IDENTIFIER"]);

2
system/proclogd/SConscript
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@ -1,5 +1,5 @@
Import('env', 'cereal', 'messaging', 'common')
libs = [cereal, messaging, 'pthread', 'zmq', 'capnp', 'kj', 'common', 'zmq']
libs = [cereal, messaging, 'pthread', 'zmq', 'capnp', 'kj', 'common', 'zmq', 'json11']
env.Program('proclogd', ['main.cc', 'proclog.cc'], LIBS=libs)
if GetOption('extras'):

3
third_party/SConscript vendored
View File

@ -1,3 +1,6 @@
Import('env')
env.Library('json11', ['json11/json11.cpp'], CCFLAGS=env['CCFLAGS'] + ['-Wno-unqualified-std-cast-call'])
env.Append(CPPPATH=[Dir('json11')])
env.Library('kaitai', ['kaitai/kaitaistream.cpp'], CPPDEFINES=['KS_STR_ENCODING_NONE'])

784
third_party/json11/json11.cpp vendored Normal file
View File

@ -0,0 +1,784 @@
/* Copyright (c) 2013 Dropbox, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "json11.hpp"
#include <cassert>
#include <cmath>
#include <cstdlib>
#include <cstdio>
#include <limits>
namespace json11 {
static const int max_depth = 200;
using std::string;
using std::vector;
using std::map;
using std::make_shared;
using std::initializer_list;
using std::move;
/* Helper for representing null - just a do-nothing struct, plus comparison
* operators so the helpers in JsonValue work. We can't use nullptr_t because
* it may not be orderable.
*/
struct NullStruct {
bool operator==(NullStruct) const { return true; }
bool operator<(NullStruct) const { return false; }
};
/* * * * * * * * * * * * * * * * * * * *
* Serialization
*/
static void dump(NullStruct, string &out) {
out += "null";
}
static void dump(double value, string &out) {
if (std::isfinite(value)) {
char buf[32];
snprintf(buf, sizeof buf, "%.17g", value);
out += buf;
} else {
out += "null";
}
}
static void dump(int value, string &out) {
char buf[32];
snprintf(buf, sizeof buf, "%d", value);
out += buf;
}
static void dump(bool value, string &out) {
out += value ? "true" : "false";
}
static void dump(const string &value, string &out) {
out += '"';
for (size_t i = 0; i < value.length(); i++) {
const char ch = value[i];
if (ch == '\\') {
out += "\\\\";
} else if (ch == '"') {
out += "\\\"";
} else if (ch == '\b') {
out += "\\b";
} else if (ch == '\f') {
out += "\\f";
} else if (ch == '\n') {
out += "\\n";
} else if (ch == '\r') {
out += "\\r";
} else if (ch == '\t') {
out += "\\t";
} else if (static_cast<uint8_t>(ch) <= 0x1f) {
char buf[8];
snprintf(buf, sizeof buf, "\\u%04x", ch);
out += buf;
} else if (static_cast<uint8_t>(ch) == 0xe2 && static_cast<uint8_t>(value[i+1]) == 0x80
&& static_cast<uint8_t>(value[i+2]) == 0xa8) {
out += "\\u2028";
i += 2;
} else if (static_cast<uint8_t>(ch) == 0xe2 && static_cast<uint8_t>(value[i+1]) == 0x80
&& static_cast<uint8_t>(value[i+2]) == 0xa9) {
out += "\\u2029";
i += 2;
} else {
out += ch;
}
}
out += '"';
}
static void dump(const Json::array &values, string &out) {
bool first = true;
out += "[";
for (const auto &value : values) {
if (!first)
out += ", ";
value.dump(out);
first = false;
}
out += "]";
}
static void dump(const Json::object &values, string &out) {
bool first = true;
out += "{";
for (const auto &kv : values) {
if (!first)
out += ", ";
dump(kv.first, out);
out += ": ";
kv.second.dump(out);
first = false;
}
out += "}";
}
void Json::dump(string &out) const {
m_ptr->dump(out);
}
/* * * * * * * * * * * * * * * * * * * *
* Value wrappers
*/
template <Json::Type tag, typename T>
class Value : public JsonValue {
protected:
// Constructors
explicit Value(const T &value) : m_value(value) {}
explicit Value(T &&value) : m_value(move(value)) {}
// Get type tag
Json::Type type() const override {
return tag;
}
// Comparisons
bool equals(const JsonValue * other) const override {
return m_value == static_cast<const Value<tag, T> *>(other)->m_value;
}
bool less(const JsonValue * other) const override {
return m_value < static_cast<const Value<tag, T> *>(other)->m_value;
}
const T m_value;
void dump(string &out) const override { json11::dump(m_value, out); }
};
class JsonDouble final : public Value<Json::NUMBER, double> {
double number_value() const override { return m_value; }
int int_value() const override { return static_cast<int>(m_value); }
bool equals(const JsonValue * other) const override { return m_value == other->number_value(); }
bool less(const JsonValue * other) const override { return m_value < other->number_value(); }
public:
explicit JsonDouble(double value) : Value(value) {}
};
class JsonInt final : public Value<Json::NUMBER, int> {
double number_value() const override { return m_value; }
int int_value() const override { return m_value; }
bool equals(const JsonValue * other) const override { return m_value == other->number_value(); }
bool less(const JsonValue * other) const override { return m_value < other->number_value(); }
public:
explicit JsonInt(int value) : Value(value) {}
};
class JsonBoolean final : public Value<Json::BOOL, bool> {
bool bool_value() const override { return m_value; }
public:
explicit JsonBoolean(bool value) : Value(value) {}
};
class JsonString final : public Value<Json::STRING, string> {
const string &string_value() const override { return m_value; }
public:
explicit JsonString(const string &value) : Value(value) {}
explicit JsonString(string &&value) : Value(move(value)) {}
};
class JsonArray final : public Value<Json::ARRAY, Json::array> {
const Json::array &array_items() const override { return m_value; }
const Json & operator[](size_t i) const override;
public:
explicit JsonArray(const Json::array &value) : Value(value) {}
explicit JsonArray(Json::array &&value) : Value(move(value)) {}
};
class JsonObject final : public Value<Json::OBJECT, Json::object> {
const Json::object &object_items() const override { return m_value; }
const Json & operator[](const string &key) const override;
public:
explicit JsonObject(const Json::object &value) : Value(value) {}
explicit JsonObject(Json::object &&value) : Value(move(value)) {}
};
class JsonNull final : public Value<Json::NUL, NullStruct> {
public:
JsonNull() : Value({}) {}
};
/* * * * * * * * * * * * * * * * * * * *
* Static globals - static-init-safe
*/
struct Statics {
const std::shared_ptr<JsonValue> null = make_shared<JsonNull>();
const std::shared_ptr<JsonValue> t = make_shared<JsonBoolean>(true);
const std::shared_ptr<JsonValue> f = make_shared<JsonBoolean>(false);
const string empty_string;
const vector<Json> empty_vector;
const map<string, Json> empty_map;
Statics() {}
};
static const Statics & statics() {
static const Statics s {};
return s;
}
static const Json & static_null() {
// This has to be separate, not in Statics, because Json() accesses statics().null.
static const Json json_null;
return json_null;
}
/* * * * * * * * * * * * * * * * * * * *
* Constructors
*/
Json::Json() noexcept : m_ptr(statics().null) {}
Json::Json(std::nullptr_t) noexcept : m_ptr(statics().null) {}
Json::Json(double value) : m_ptr(make_shared<JsonDouble>(value)) {}
Json::Json(int value) : m_ptr(make_shared<JsonInt>(value)) {}
Json::Json(bool value) : m_ptr(value ? statics().t : statics().f) {}
Json::Json(const string &value) : m_ptr(make_shared<JsonString>(value)) {}
Json::Json(string &&value) : m_ptr(make_shared<JsonString>(move(value))) {}
Json::Json(const char * value) : m_ptr(make_shared<JsonString>(value)) {}
Json::Json(const Json::array &values) : m_ptr(make_shared<JsonArray>(values)) {}
Json::Json(Json::array &&values) : m_ptr(make_shared<JsonArray>(move(values))) {}
Json::Json(const Json::object &values) : m_ptr(make_shared<JsonObject>(values)) {}
Json::Json(Json::object &&values) : m_ptr(make_shared<JsonObject>(move(values))) {}
/* * * * * * * * * * * * * * * * * * * *
* Accessors
*/
Json::Type Json::type() const { return m_ptr->type(); }
double Json::number_value() const { return m_ptr->number_value(); }
int Json::int_value() const { return m_ptr->int_value(); }
bool Json::bool_value() const { return m_ptr->bool_value(); }
const string & Json::string_value() const { return m_ptr->string_value(); }
const vector<Json> & Json::array_items() const { return m_ptr->array_items(); }
const map<string, Json> & Json::object_items() const { return m_ptr->object_items(); }
const Json & Json::operator[] (size_t i) const { return (*m_ptr)[i]; }
const Json & Json::operator[] (const string &key) const { return (*m_ptr)[key]; }
double JsonValue::number_value() const { return 0; }
int JsonValue::int_value() const { return 0; }
bool JsonValue::bool_value() const { return false; }
const string & JsonValue::string_value() const { return statics().empty_string; }
const vector<Json> & JsonValue::array_items() const { return statics().empty_vector; }
const map<string, Json> & JsonValue::object_items() const { return statics().empty_map; }
const Json & JsonValue::operator[] (size_t) const { return static_null(); }
const Json & JsonValue::operator[] (const string &) const { return static_null(); }
const Json & JsonObject::operator[] (const string &key) const {
auto iter = m_value.find(key);
return (iter == m_value.end()) ? static_null() : iter->second;
}
const Json & JsonArray::operator[] (size_t i) const {
if (i >= m_value.size()) return static_null();
else return m_value[i];
}
/* * * * * * * * * * * * * * * * * * * *
* Comparison
*/
bool Json::operator== (const Json &other) const {
if (m_ptr->type() != other.m_ptr->type())
return false;
return m_ptr->equals(other.m_ptr.get());
}
bool Json::operator< (const Json &other) const {
if (m_ptr->type() != other.m_ptr->type())
return m_ptr->type() < other.m_ptr->type();
return m_ptr->less(other.m_ptr.get());
}
/* * * * * * * * * * * * * * * * * * * *
* Parsing
*/
/* esc(c)
*
* Format char c suitable for printing in an error message.
*/
static inline string esc(char c) {
char buf[12];
if (static_cast<uint8_t>(c) >= 0x20 && static_cast<uint8_t>(c) <= 0x7f) {
snprintf(buf, sizeof buf, "'%c' (%d)", c, c);
} else {
snprintf(buf, sizeof buf, "(%d)", c);
}
return string(buf);
}
static inline bool in_range(long x, long lower, long upper) {
return (x >= lower && x <= upper);
}
namespace {
/* JsonParser
*
* Object that tracks all state of an in-progress parse.
*/
struct JsonParser final {
/* State
*/
const string &str;
size_t i;
string &err;
bool failed;
const JsonParse strategy;
/* fail(msg, err_ret = Json())
*
* Mark this parse as failed.
*/
Json fail(string &&msg) {
return fail(move(msg), Json());
}
template <typename T>
T fail(string &&msg, const T err_ret) {
if (!failed)
err = std::move(msg);
failed = true;
return err_ret;
}
/* consume_whitespace()
*
* Advance until the current character is non-whitespace.
*/
void consume_whitespace() {
while (str[i] == ' ' || str[i] == '\r' || str[i] == '\n' || str[i] == '\t')
i++;
}
/* consume_comment()
*
* Advance comments (c-style inline and multiline).
*/
bool consume_comment() {
bool comment_found = false;
if (str[i] == '/') {
i++;
if (i == str.size())
return fail("unexpected end of input after start of comment", false);
if (str[i] == '/') { // inline comment
i++;
// advance until next line, or end of input
while (i < str.size() && str[i] != '\n') {
i++;
}
comment_found = true;
}
else if (str[i] == '*') { // multiline comment
i++;
if (i > str.size()-2)
return fail("unexpected end of input inside multi-line comment", false);
// advance until closing tokens
while (!(str[i] == '*' && str[i+1] == '/')) {
i++;
if (i > str.size()-2)
return fail(
"unexpected end of input inside multi-line comment", false);
}
i += 2;
comment_found = true;
}
else
return fail("malformed comment", false);
}
return comment_found;
}
/* consume_garbage()
*
* Advance until the current character is non-whitespace and non-comment.
*/
void consume_garbage() {
consume_whitespace();
if(strategy == JsonParse::COMMENTS) {
bool comment_found = false;
do {
comment_found = consume_comment();
if (failed) return;
consume_whitespace();
}
while(comment_found);
}
}
/* get_next_token()
*
* Return the next non-whitespace character. If the end of the input is reached,
* flag an error and return 0.
*/
char get_next_token() {
consume_garbage();
if (failed) return (char)0;
if (i == str.size())
return fail("unexpected end of input", (char)0);
return str[i++];
}
/* encode_utf8(pt, out)
*
* Encode pt as UTF-8 and add it to out.
*/
void encode_utf8(long pt, string & out) {
if (pt < 0)
return;
if (pt < 0x80) {
out += static_cast<char>(pt);
} else if (pt < 0x800) {
out += static_cast<char>((pt >> 6) | 0xC0);
out += static_cast<char>((pt & 0x3F) | 0x80);
} else if (pt < 0x10000) {
out += static_cast<char>((pt >> 12) | 0xE0);
out += static_cast<char>(((pt >> 6) & 0x3F) | 0x80);
out += static_cast<char>((pt & 0x3F) | 0x80);
} else {
out += static_cast<char>((pt >> 18) | 0xF0);
out += static_cast<char>(((pt >> 12) & 0x3F) | 0x80);
out += static_cast<char>(((pt >> 6) & 0x3F) | 0x80);
out += static_cast<char>((pt & 0x3F) | 0x80);
}
}
/* parse_string()
*
* Parse a string, starting at the current position.
*/
string parse_string() {
string out;
long last_escaped_codepoint = -1;
while (true) {
if (i == str.size())
return fail("unexpected end of input in string", "");
char ch = str[i++];
if (ch == '"') {
encode_utf8(last_escaped_codepoint, out);
return out;
}
if (in_range(ch, 0, 0x1f))
return fail("unescaped " + esc(ch) + " in string", "");
// The usual case: non-escaped characters
if (ch != '\\') {
encode_utf8(last_escaped_codepoint, out);
last_escaped_codepoint = -1;
out += ch;
continue;
}
// Handle escapes
if (i == str.size())
return fail("unexpected end of input in string", "");
ch = str[i++];
if (ch == 'u') {
// Extract 4-byte escape sequence
string esc = str.substr(i, 4);
// Explicitly check length of the substring. The following loop
// relies on std::string returning the terminating NUL when
// accessing str[length]. Checking here reduces brittleness.
if (esc.length() < 4) {
return fail("bad \\u escape: " + esc, "");
}
for (size_t j = 0; j < 4; j++) {
if (!in_range(esc[j], 'a', 'f') && !in_range(esc[j], 'A', 'F')
&& !in_range(esc[j], '0', '9'))
return fail("bad \\u escape: " + esc, "");
}
long codepoint = strtol(esc.data(), nullptr, 16);
// JSON specifies that characters outside the BMP shall be encoded as a pair
// of 4-hex-digit \u escapes encoding their surrogate pair components. Check
// whether we're in the middle of such a beast: the previous codepoint was an
// escaped lead (high) surrogate, and this is a trail (low) surrogate.
if (in_range(last_escaped_codepoint, 0xD800, 0xDBFF)
&& in_range(codepoint, 0xDC00, 0xDFFF)) {
// Reassemble the two surrogate pairs into one astral-plane character, per
// the UTF-16 algorithm.
encode_utf8((((last_escaped_codepoint - 0xD800) << 10)
| (codepoint - 0xDC00)) + 0x10000, out);
last_escaped_codepoint = -1;
} else {
encode_utf8(last_escaped_codepoint, out);
last_escaped_codepoint = codepoint;
}
i += 4;
continue;
}
encode_utf8(last_escaped_codepoint, out);
last_escaped_codepoint = -1;
if (ch == 'b') {
out += '\b';
} else if (ch == 'f') {
out += '\f';
} else if (ch == 'n') {
out += '\n';
} else if (ch == 'r') {
out += '\r';
} else if (ch == 't') {
out += '\t';
} else if (ch == '"' || ch == '\\' || ch == '/') {
out += ch;
} else {
return fail("invalid escape character " + esc(ch), "");
}
}
}
/* parse_number()
*
* Parse a double.
*/
Json parse_number() {
size_t start_pos = i;
if (str[i] == '-')
i++;
// Integer part
if (str[i] == '0') {
i++;
if (in_range(str[i], '0', '9'))
return fail("leading 0s not permitted in numbers");
} else if (in_range(str[i], '1', '9')) {
i++;
while (in_range(str[i], '0', '9'))
i++;
} else {
return fail("invalid " + esc(str[i]) + " in number");
}
if (str[i] != '.' && str[i] != 'e' && str[i] != 'E'
&& (i - start_pos) <= static_cast<size_t>(std::numeric_limits<int>::digits10)) {
return std::atoi(str.c_str() + start_pos);
}
// Decimal part
if (str[i] == '.') {
i++;
if (!in_range(str[i], '0', '9'))
return fail("at least one digit required in fractional part");
while (in_range(str[i], '0', '9'))
i++;
}
// Exponent part
if (str[i] == 'e' || str[i] == 'E') {
i++;
if (str[i] == '+' || str[i] == '-')
i++;
if (!in_range(str[i], '0', '9'))
return fail("at least one digit required in exponent");
while (in_range(str[i], '0', '9'))
i++;
}
return std::strtod(str.c_str() + start_pos, nullptr);
}
/* expect(str, res)
*
* Expect that 'str' starts at the character that was just read. If it does, advance
* the input and return res. If not, flag an error.
*/
Json expect(const string &expected, Json res) {
assert(i != 0);
i--;
if (str.compare(i, expected.length(), expected) == 0) {
i += expected.length();
return res;
} else {
return fail("parse error: expected " + expected + ", got " + str.substr(i, expected.length()));
}
}
/* parse_json()
*
* Parse a JSON object.
*/
Json parse_json(int depth) {
if (depth > max_depth) {
return fail("exceeded maximum nesting depth");
}
char ch = get_next_token();
if (failed)
return Json();
if (ch == '-' || (ch >= '0' && ch <= '9')) {
i--;
return parse_number();
}
if (ch == 't')
return expect("true", true);
if (ch == 'f')
return expect("false", false);
if (ch == 'n')
return expect("null", Json());
if (ch == '"')
return parse_string();
if (ch == '{') {
map<string, Json> data;
ch = get_next_token();
if (ch == '}')
return data;
while (1) {
if (ch != '"')
return fail("expected '\"' in object, got " + esc(ch));
string key = parse_string();
if (failed)
return Json();
ch = get_next_token();
if (ch != ':')
return fail("expected ':' in object, got " + esc(ch));
data[std::move(key)] = parse_json(depth + 1);
if (failed)
return Json();
ch = get_next_token();
if (ch == '}')
break;
if (ch != ',')
return fail("expected ',' in object, got " + esc(ch));
ch = get_next_token();
}
return data;
}
if (ch == '[') {
vector<Json> data;
ch = get_next_token();
if (ch == ']')
return data;
while (1) {
i--;
data.push_back(parse_json(depth + 1));
if (failed)
return Json();
ch = get_next_token();
if (ch == ']')
break;
if (ch != ',')
return fail("expected ',' in list, got " + esc(ch));
ch = get_next_token();
(void)ch;
}
return data;
}
return fail("expected value, got " + esc(ch));
}
};
}//namespace {
Json Json::parse(const string &in, string &err, JsonParse strategy) {
JsonParser parser { in, 0, err, false, strategy };
Json result = parser.parse_json(0);
// Check for any trailing garbage
parser.consume_garbage();
if (parser.failed)
return Json();
if (parser.i != in.size())
return parser.fail("unexpected trailing " + esc(in[parser.i]));
return result;
}
// Documented in json11.hpp
vector<Json> Json::parse_multi(const string &in,
std::string::size_type &parser_stop_pos,
string &err,
JsonParse strategy) {
JsonParser parser { in, 0, err, false, strategy };
parser_stop_pos = 0;
vector<Json> json_vec;
while (parser.i != in.size() && !parser.failed) {
json_vec.push_back(parser.parse_json(0));
if (parser.failed)
break;
// Check for another object
parser.consume_garbage();
if (parser.failed)
break;
parser_stop_pos = parser.i;
}
return json_vec;
}
/* * * * * * * * * * * * * * * * * * * *
* Shape-checking
*/
bool Json::has_shape(const shape & types, string & err) const {
if (!is_object()) {
err = "expected JSON object, got " + dump();
return false;
}
for (auto & item : types) {
if ((*this)[item.first].type() != item.second) {
err = "bad type for " + item.first + " in " + dump();
return false;
}
}
return true;
}
} // namespace json11

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@ -0,0 +1,232 @@
/* json11
*
* json11 is a tiny JSON library for C++11, providing JSON parsing and serialization.
*
* The core object provided by the library is json11::Json. A Json object represents any JSON
* value: null, bool, number (int or double), string (std::string), array (std::vector), or
* object (std::map).
*
* Json objects act like values: they can be assigned, copied, moved, compared for equality or
* order, etc. There are also helper methods Json::dump, to serialize a Json to a string, and
* Json::parse (static) to parse a std::string as a Json object.
*
* Internally, the various types of Json object are represented by the JsonValue class
* hierarchy.
*
* A note on numbers - JSON specifies the syntax of number formatting but not its semantics,
* so some JSON implementations distinguish between integers and floating-point numbers, while
* some don't. In json11, we choose the latter. Because some JSON implementations (namely
* Javascript itself) treat all numbers as the same type, distinguishing the two leads
* to JSON that will be *silently* changed by a round-trip through those implementations.
* Dangerous! To avoid that risk, json11 stores all numbers as double internally, but also
* provides integer helpers.
*
* Fortunately, double-precision IEEE754 ('double') can precisely store any integer in the
* range +/-2^53, which includes every 'int' on most systems. (Timestamps often use int64
* or long long to avoid the Y2038K problem; a double storing microseconds since some epoch
* will be exact for +/- 275 years.)
*/
/* Copyright (c) 2013 Dropbox, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#pragma once
#include <string>
#include <vector>
#include <map>
#include <memory>
#include <initializer_list>
#ifdef _MSC_VER
#if _MSC_VER <= 1800 // VS 2013
#ifndef noexcept
#define noexcept throw()
#endif
#ifndef snprintf
#define snprintf _snprintf_s
#endif
#endif
#endif
namespace json11 {
enum JsonParse {
STANDARD, COMMENTS
};
class JsonValue;
class Json final {
public:
// Types
enum Type {
NUL, NUMBER, BOOL, STRING, ARRAY, OBJECT
};
// Array and object typedefs
typedef std::vector<Json> array;
typedef std::map<std::string, Json> object;
// Constructors for the various types of JSON value.
Json() noexcept; // NUL
Json(std::nullptr_t) noexcept; // NUL
Json(double value); // NUMBER
Json(int value); // NUMBER
Json(bool value); // BOOL
Json(const std::string &value); // STRING
Json(std::string &&value); // STRING
Json(const char * value); // STRING
Json(const array &values); // ARRAY
Json(array &&values); // ARRAY
Json(const object &values); // OBJECT
Json(object &&values); // OBJECT
// Implicit constructor: anything with a to_json() function.
template <class T, class = decltype(&T::to_json)>
Json(const T & t) : Json(t.to_json()) {}
// Implicit constructor: map-like objects (std::map, std::unordered_map, etc)
template <class M, typename std::enable_if<
std::is_constructible<std::string, typename M::key_type>::value
&& std::is_constructible<Json, typename M::mapped_type>::value,
int>::type = 0>
Json(const M & m) : Json(object(m.begin(), m.end())) {}
// Implicit constructor: vector-like objects (std::list, std::vector, std::set, etc)
template <class V, typename std::enable_if<
std::is_constructible<Json, typename V::value_type>::value,
int>::type = 0>
Json(const V & v) : Json(array(v.begin(), v.end())) {}
// This prevents Json(some_pointer) from accidentally producing a bool. Use
// Json(bool(some_pointer)) if that behavior is desired.
Json(void *) = delete;
// Accessors
Type type() const;
bool is_null() const { return type() == NUL; }
bool is_number() const { return type() == NUMBER; }
bool is_bool() const { return type() == BOOL; }
bool is_string() const { return type() == STRING; }
bool is_array() const { return type() == ARRAY; }
bool is_object() const { return type() == OBJECT; }
// Return the enclosed value if this is a number, 0 otherwise. Note that json11 does not
// distinguish between integer and non-integer numbers - number_value() and int_value()
// can both be applied to a NUMBER-typed object.
double number_value() const;
int int_value() const;
// Return the enclosed value if this is a boolean, false otherwise.
bool bool_value() const;
// Return the enclosed string if this is a string, "" otherwise.
const std::string &string_value() const;
// Return the enclosed std::vector if this is an array, or an empty vector otherwise.
const array &array_items() const;
// Return the enclosed std::map if this is an object, or an empty map otherwise.
const object &object_items() const;
// Return a reference to arr[i] if this is an array, Json() otherwise.
const Json & operator[](size_t i) const;
// Return a reference to obj[key] if this is an object, Json() otherwise.
const Json & operator[](const std::string &key) const;
// Serialize.
void dump(std::string &out) const;
std::string dump() const {
std::string out;
dump(out);
return out;
}
// Parse. If parse fails, return Json() and assign an error message to err.
static Json parse(const std::string & in,
std::string & err,
JsonParse strategy = JsonParse::STANDARD);
static Json parse(const char * in,
std::string & err,
JsonParse strategy = JsonParse::STANDARD) {
if (in) {
return parse(std::string(in), err, strategy);
} else {
err = "null input";
return nullptr;
}
}
// Parse multiple objects, concatenated or separated by whitespace
static std::vector<Json> parse_multi(
const std::string & in,
std::string::size_type & parser_stop_pos,
std::string & err,
JsonParse strategy = JsonParse::STANDARD);
static inline std::vector<Json> parse_multi(
const std::string & in,
std::string & err,
JsonParse strategy = JsonParse::STANDARD) {
std::string::size_type parser_stop_pos;
return parse_multi(in, parser_stop_pos, err, strategy);
}
bool operator== (const Json &rhs) const;
bool operator< (const Json &rhs) const;
bool operator!= (const Json &rhs) const { return !(*this == rhs); }
bool operator<= (const Json &rhs) const { return !(rhs < *this); }
bool operator> (const Json &rhs) const { return (rhs < *this); }
bool operator>= (const Json &rhs) const { return !(*this < rhs); }
/* has_shape(types, err)
*
* Return true if this is a JSON object and, for each item in types, has a field of
* the given type. If not, return false and set err to a descriptive message.
*/
typedef std::initializer_list<std::pair<std::string, Type>> shape;
bool has_shape(const shape & types, std::string & err) const;
private:
std::shared_ptr<JsonValue> m_ptr;
};
// Internal class hierarchy - JsonValue objects are not exposed to users of this API.
class JsonValue {
protected:
friend class Json;
friend class JsonInt;
friend class JsonDouble;
virtual Json::Type type() const = 0;
virtual bool equals(const JsonValue * other) const = 0;
virtual bool less(const JsonValue * other) const = 0;
virtual void dump(std::string &out) const = 0;
virtual double number_value() const;
virtual int int_value() const;
virtual bool bool_value() const;
virtual const std::string &string_value() const;
virtual const Json::array &array_items() const;
virtual const Json &operator[](size_t i) const;
virtual const Json::object &object_items() const;
virtual const Json &operator[](const std::string &key) const;
virtual ~JsonValue() {}
};
} // namespace json11

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third_party/nlohmann/json.hpp vendored
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