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Copy pathjson.cpp
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418 lines (372 loc) · 11.7 KB
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#include "engine/framework/io/json.h"
#include "engine/framework/io/filesystem.h"
#include <cctype>
#include <cmath>
#include <string_view>
#include <stdexcept>
#include "cJSON.h"
namespace engine::io::json {
namespace {
cJSON * make_cjson(const Value & value) {
switch (value.kind()) {
case Value::Kind::Null:
return cJSON_CreateNull();
case Value::Kind::Bool:
return cJSON_CreateBool(value.as_bool());
case Value::Kind::Number:
return cJSON_CreateNumber(value.as_number());
case Value::Kind::String:
return cJSON_CreateString(value.as_string().c_str());
case Value::Kind::Array: {
cJSON * array_json = cJSON_CreateArray();
if (array_json == nullptr) {
throw std::runtime_error("failed to create json array");
}
const auto & array_values = value.as_array();
for (const auto & child_value : array_values) {
cJSON * child = make_cjson(child_value);
if (child == nullptr) {
cJSON_Delete(array_json);
throw std::runtime_error("failed to create json array element");
}
cJSON_AddItemToArray(array_json, child);
}
return array_json;
}
case Value::Kind::Object: {
cJSON * object = cJSON_CreateObject();
if (object == nullptr) {
throw std::runtime_error("failed to create json object");
}
for (const auto & [key, child] : value.as_object()) {
cJSON * child_json = make_cjson(child);
if (child_json == nullptr) {
cJSON_Delete(object);
throw std::runtime_error("failed to create json object field");
}
if (!cJSON_AddItemToObject(object, key.c_str(), child_json)) {
cJSON_Delete(child_json);
cJSON_Delete(object);
throw std::runtime_error("failed to add json object field");
}
}
return object;
}
}
throw std::runtime_error("unsupported json value kind");
}
std::string print_cjson(cJSON * root) {
if (root == nullptr) {
throw std::runtime_error("cannot print null cJSON root");
}
char * text = cJSON_PrintUnformatted(root);
if (text == nullptr) {
throw std::runtime_error("failed to serialize json");
}
std::string out(text);
cJSON_free(text);
return out;
}
std::string strip_jsonc_comments(std::string_view text) {
std::string out;
out.reserve(text.size());
bool in_string = false;
bool escaped = false;
for (size_t index = 0; index < text.size(); ++index) {
const char ch = text[index];
if (in_string) {
out.push_back(ch);
if (escaped) {
escaped = false;
} else if (ch == '\\') {
escaped = true;
} else if (ch == '"') {
in_string = false;
}
continue;
}
if (ch == '"') {
in_string = true;
out.push_back(ch);
continue;
}
if (ch == '/' && index + 1 < text.size() && text[index + 1] == '/') {
while (index < text.size() && text[index] != '\n') {
++index;
}
if (index < text.size()) {
out.push_back('\n');
}
continue;
}
out.push_back(ch);
}
return out;
}
std::string strip_jsonc_trailing_commas(std::string_view text) {
std::string out;
out.reserve(text.size());
bool in_string = false;
bool escaped = false;
for (size_t index = 0; index < text.size(); ++index) {
const char ch = text[index];
if (in_string) {
out.push_back(ch);
if (escaped) {
escaped = false;
} else if (ch == '\\') {
escaped = true;
} else if (ch == '"') {
in_string = false;
}
continue;
}
if (ch == '"') {
in_string = true;
out.push_back(ch);
continue;
}
if (ch == ',') {
size_t lookahead = index + 1;
while (lookahead < text.size() && std::isspace(static_cast<unsigned char>(text[lookahead])) != 0) {
++lookahead;
}
if (lookahead < text.size() && (text[lookahead] == '}' || text[lookahead] == ']')) {
continue;
}
}
out.push_back(ch);
}
return out;
}
Value convert_cjson(const cJSON * node) {
if (node == nullptr) {
throw std::runtime_error("json conversion received null node");
}
if (cJSON_IsNull(node) != 0) {
return Value::make_null();
}
if (cJSON_IsBool(node) != 0) {
return Value::make_bool(cJSON_IsTrue(node) != 0);
}
if (cJSON_IsNumber(node) != 0) {
return Value::make_number(node->valuedouble);
}
if (cJSON_IsString(node) != 0) {
return Value::make_string(node->valuestring != nullptr ? node->valuestring : "");
}
if (cJSON_IsArray(node) != 0) {
Value::Array out;
const int size = cJSON_GetArraySize(node);
if (size > 0) {
out.reserve(static_cast<size_t>(size));
}
for (const cJSON * child = node->child; child != nullptr; child = child->next) {
out.push_back(convert_cjson(child));
}
return Value::make_array(std::move(out));
}
if (cJSON_IsObject(node) != 0) {
Value::Object out;
for (const cJSON * child = node->child; child != nullptr; child = child->next) {
if (child->string == nullptr) {
throw std::runtime_error("json object key is missing");
}
if (out.find(child->string) != out.end()) {
throw std::runtime_error("duplicate json object key: " + std::string(child->string));
}
out.emplace(child->string, convert_cjson(child));
}
return Value::make_object(std::move(out));
}
throw std::runtime_error("unsupported json node type");
}
} // namespace
Value Value::make_null() {
return {};
}
Value::Value(const Value & other)
: kind_(other.kind_),
bool_value_(other.bool_value_),
number_value_(other.number_value_),
string_value_(other.string_value_) {
if (other.array_value_) {
array_value_ = std::make_unique<Array>(*other.array_value_);
}
if (other.object_value_) {
object_value_ = std::make_unique<Object>(*other.object_value_);
}
}
Value & Value::operator=(const Value & other) {
if (this == &other) {
return *this;
}
kind_ = other.kind_;
bool_value_ = other.bool_value_;
number_value_ = other.number_value_;
string_value_ = other.string_value_;
array_value_ = other.array_value_ ? std::make_unique<Array>(*other.array_value_) : nullptr;
object_value_ = other.object_value_ ? std::make_unique<Object>(*other.object_value_) : nullptr;
return *this;
}
Value::Value(Value && other) noexcept = default;
Value & Value::operator=(Value && other) noexcept = default;
Value::~Value() = default;
Value Value::make_bool(bool value) {
Value out;
out.kind_ = Kind::Bool;
out.bool_value_ = value;
return out;
}
Value Value::make_number(double value) {
Value out;
out.kind_ = Kind::Number;
out.number_value_ = value;
return out;
}
Value Value::make_string(std::string value) {
Value out;
out.kind_ = Kind::String;
out.string_value_ = std::move(value);
return out;
}
Value Value::make_array(Array value) {
Value out;
out.kind_ = Kind::Array;
out.array_value_ = std::make_unique<Array>(std::move(value));
return out;
}
Value Value::make_object(Object value) {
Value out;
out.kind_ = Kind::Object;
out.object_value_ = std::make_unique<Object>(std::move(value));
return out;
}
Value::Kind Value::kind() const noexcept {
return kind_;
}
bool Value::is_null() const noexcept {
return kind_ == Kind::Null;
}
bool Value::is_bool() const noexcept {
return kind_ == Kind::Bool;
}
bool Value::is_number() const noexcept {
return kind_ == Kind::Number;
}
bool Value::is_string() const noexcept {
return kind_ == Kind::String;
}
bool Value::is_array() const noexcept {
return kind_ == Kind::Array;
}
bool Value::is_object() const noexcept {
return kind_ == Kind::Object;
}
bool Value::as_bool() const {
if (!is_bool()) {
throw std::runtime_error("json value is not a bool");
}
return bool_value_;
}
double Value::as_number() const {
if (!is_number()) {
throw std::runtime_error("json value is not a number");
}
return number_value_;
}
int64_t Value::as_i64() const {
const double value = as_number();
if (!std::isfinite(value) || std::floor(value) != value) {
throw std::runtime_error("json number is not an integer");
}
return static_cast<int64_t>(value);
}
float Value::as_f32() const {
return static_cast<float>(as_number());
}
const std::string & Value::as_string() const {
if (!is_string()) {
throw std::runtime_error("json value is not a string");
}
return string_value_;
}
const Value::Array & Value::as_array() const {
if (!is_array()) {
throw std::runtime_error("json value is not an array");
}
return *array_value_;
}
const Value::Object & Value::as_object() const {
if (!is_object()) {
throw std::runtime_error("json value is not an object");
}
return *object_value_;
}
const Value & Value::require(const std::string & key) const {
const Value * value = find(key);
if (value == nullptr) {
throw std::runtime_error("missing required json key: " + key);
}
return *value;
}
const Value * Value::find(const std::string & key) const noexcept {
if (!is_object()) {
return nullptr;
}
const auto it = object_value_->find(key);
return it == object_value_->end() ? nullptr : &it->second;
}
Value parse(std::string_view text) {
const char * parse_end = nullptr;
cJSON * root = cJSON_ParseWithLengthOpts(text.data(), text.size(), &parse_end, 0);
if (root == nullptr) {
const ptrdiff_t error_offset = parse_end == nullptr ? -1 : parse_end - text.data();
throw std::runtime_error("failed to parse json at byte " + std::to_string(error_offset));
}
try {
if (parse_end != nullptr) {
for (const char * cursor = parse_end; cursor < text.data() + text.size(); ++cursor) {
if (std::isspace(static_cast<unsigned char>(*cursor)) == 0) {
throw std::runtime_error("unexpected trailing json content");
}
}
}
Value out = convert_cjson(root);
cJSON_Delete(root);
return out;
} catch (...) {
cJSON_Delete(root);
throw;
}
}
Value parse_jsonc(std::string_view text) {
return parse(strip_jsonc_trailing_commas(strip_jsonc_comments(text)));
}
Value parse_file(const std::filesystem::path & path) {
return parse(engine::io::read_text_file(path));
}
Value parse_jsonc_file(const std::filesystem::path & path) {
return parse_jsonc(engine::io::read_text_file(path));
}
std::string stringify(const Value & value) {
cJSON * root = make_cjson(value);
if (root == nullptr) {
throw std::runtime_error("failed to convert value to json");
}
try {
std::string out = print_cjson(root);
cJSON_Delete(root);
return out;
} catch (...) {
cJSON_Delete(root);
throw;
}
}
std::string stringify_number(double value) {
return stringify(Value::make_number(value));
}
std::string stringify_string(std::string_view value) {
return stringify(Value::make_string(std::string(value)));
}
} // namespace engine::io::json