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godot/core/io/json.cpp

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/**************************************************************************/
/* json.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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 "json.h"
#include "core/config/engine.h"
#include "core/string/print_string.h"
const char *JSON::tk_name[TK_MAX] = {
"'{'",
"'}'",
"'['",
"']'",
"identifier",
"string",
"number",
"':'",
"','",
"EOF",
};
String JSON::_make_indent(const String &p_indent, int p_size) {
return p_indent.repeat(p_size);
}
String JSON::_stringify(const Variant &p_var, const String &p_indent, int p_cur_indent, bool p_sort_keys, HashSet<const void *> &p_markers, bool p_full_precision) {
ERR_FAIL_COND_V_MSG(p_cur_indent > Variant::MAX_RECURSION_DEPTH, "...", "JSON structure is too deep. Bailing.");
String colon = ":";
String end_statement = "";
if (!p_indent.is_empty()) {
colon += " ";
end_statement += "\n";
}
switch (p_var.get_type()) {
case Variant::NIL:
return "null";
case Variant::BOOL:
return p_var.operator bool() ? "true" : "false";
case Variant::INT:
return itos(p_var);
case Variant::FLOAT: {
double num = p_var;
if (p_full_precision) {
// Store unreliable digits (17) instead of just reliable
// digits (14) so that the value can be decoded exactly.
return String::num(num, 17 - (int)floor(log10(num)));
} else {
// Store only reliable digits (14) by default.
return String::num(num, 14 - (int)floor(log10(num)));
}
}
case Variant::PACKED_INT32_ARRAY:
case Variant::PACKED_INT64_ARRAY:
case Variant::PACKED_FLOAT32_ARRAY:
case Variant::PACKED_FLOAT64_ARRAY:
case Variant::PACKED_STRING_ARRAY:
case Variant::ARRAY: {
Array a = p_var;
if (a.size() == 0) {
return "[]";
}
String s = "[";
s += end_statement;
ERR_FAIL_COND_V_MSG(p_markers.has(a.id()), "\"[...]\"", "Converting circular structure to JSON.");
p_markers.insert(a.id());
for (int i = 0; i < a.size(); i++) {
if (i > 0) {
s += ",";
s += end_statement;
}
s += _make_indent(p_indent, p_cur_indent + 1) + _stringify(a[i], p_indent, p_cur_indent + 1, p_sort_keys, p_markers);
}
s += end_statement + _make_indent(p_indent, p_cur_indent) + "]";
p_markers.erase(a.id());
return s;
}
case Variant::DICTIONARY: {
String s = "{";
s += end_statement;
Dictionary d = p_var;
ERR_FAIL_COND_V_MSG(p_markers.has(d.id()), "\"{...}\"", "Converting circular structure to JSON.");
p_markers.insert(d.id());
List<Variant> keys;
d.get_key_list(&keys);
if (p_sort_keys) {
keys.sort();
}
bool first_key = true;
for (const Variant &E : keys) {
if (first_key) {
first_key = false;
} else {
s += ",";
s += end_statement;
}
s += _make_indent(p_indent, p_cur_indent + 1) + _stringify(String(E), p_indent, p_cur_indent + 1, p_sort_keys, p_markers);
s += colon;
s += _stringify(d[E], p_indent, p_cur_indent + 1, p_sort_keys, p_markers);
}
s += end_statement + _make_indent(p_indent, p_cur_indent) + "}";
p_markers.erase(d.id());
return s;
}
default:
return "\"" + String(p_var).json_escape() + "\"";
}
}
Error JSON::_get_token(const char32_t *p_str, int &index, int p_len, Token &r_token, int &line, String &r_err_str) {
while (p_len > 0) {
switch (p_str[index]) {
case '\n': {
line++;
index++;
break;
}
case 0: {
r_token.type = TK_EOF;
return OK;
} break;
case '{': {
r_token.type = TK_CURLY_BRACKET_OPEN;
index++;
return OK;
}
case '}': {
r_token.type = TK_CURLY_BRACKET_CLOSE;
index++;
return OK;
}
case '[': {
r_token.type = TK_BRACKET_OPEN;
index++;
return OK;
}
case ']': {
r_token.type = TK_BRACKET_CLOSE;
index++;
return OK;
}
case ':': {
r_token.type = TK_COLON;
index++;
return OK;
}
case ',': {
r_token.type = TK_COMMA;
index++;
return OK;
}
case '"': {
index++;
String str;
while (true) {
if (p_str[index] == 0) {
r_err_str = "Unterminated String";
return ERR_PARSE_ERROR;
} else if (p_str[index] == '"') {
index++;
break;
} else if (p_str[index] == '\\') {
//escaped characters...
index++;
char32_t next = p_str[index];
if (next == 0) {
r_err_str = "Unterminated String";
return ERR_PARSE_ERROR;
}
char32_t res = 0;
switch (next) {
case 'b':
res = 8;
break;
case 't':
res = 9;
break;
case 'n':
res = 10;
break;
case 'f':
res = 12;
break;
case 'r':
res = 13;
break;
case 'u': {
// hex number
for (int j = 0; j < 4; j++) {
char32_t c = p_str[index + j + 1];
if (c == 0) {
r_err_str = "Unterminated String";
return ERR_PARSE_ERROR;
}
if (!is_hex_digit(c)) {
r_err_str = "Malformed hex constant in string";
return ERR_PARSE_ERROR;
}
char32_t v;
if (is_digit(c)) {
v = c - '0';
} else if (c >= 'a' && c <= 'f') {
v = c - 'a';
v += 10;
} else if (c >= 'A' && c <= 'F') {
v = c - 'A';
v += 10;
} else {
ERR_PRINT("Bug parsing hex constant.");
v = 0;
}
res <<= 4;
res |= v;
}
index += 4; //will add at the end anyway
if ((res & 0xfffffc00) == 0xd800) {
if (p_str[index + 1] != '\\' || p_str[index + 2] != 'u') {
r_err_str = "Invalid UTF-16 sequence in string, unpaired lead surrogate";
return ERR_PARSE_ERROR;
}
index += 2;
char32_t trail = 0;
for (int j = 0; j < 4; j++) {
char32_t c = p_str[index + j + 1];
if (c == 0) {
r_err_str = "Unterminated String";
return ERR_PARSE_ERROR;
}
if (!is_hex_digit(c)) {
r_err_str = "Malformed hex constant in string";
return ERR_PARSE_ERROR;
}
char32_t v;
if (is_digit(c)) {
v = c - '0';
} else if (c >= 'a' && c <= 'f') {
v = c - 'a';
v += 10;
} else if (c >= 'A' && c <= 'F') {
v = c - 'A';
v += 10;
} else {
ERR_PRINT("Bug parsing hex constant.");
v = 0;
}
trail <<= 4;
trail |= v;
}
if ((trail & 0xfffffc00) == 0xdc00) {
res = (res << 10UL) + trail - ((0xd800 << 10UL) + 0xdc00 - 0x10000);
index += 4; //will add at the end anyway
} else {
r_err_str = "Invalid UTF-16 sequence in string, unpaired lead surrogate";
return ERR_PARSE_ERROR;
}
} else if ((res & 0xfffffc00) == 0xdc00) {
r_err_str = "Invalid UTF-16 sequence in string, unpaired trail surrogate";
return ERR_PARSE_ERROR;
}
} break;
case '"':
case '\\':
case '/': {
res = next;
} break;
default: {
r_err_str = "Invalid escape sequence.";
return ERR_PARSE_ERROR;
}
}
str += res;
} else {
if (p_str[index] == '\n') {
line++;
}
str += p_str[index];
}
index++;
}
r_token.type = TK_STRING;
r_token.value = str;
return OK;
} break;
default: {
if (p_str[index] <= 32) {
index++;
break;
}
if (p_str[index] == '-' || is_digit(p_str[index])) {
//a number
const char32_t *rptr;
double number = String::to_float(&p_str[index], &rptr);
index += (rptr - &p_str[index]);
r_token.type = TK_NUMBER;
r_token.value = number;
return OK;
} else if (is_ascii_char(p_str[index])) {
String id;
while (is_ascii_char(p_str[index])) {
id += p_str[index];
index++;
}
r_token.type = TK_IDENTIFIER;
r_token.value = id;
return OK;
} else {
r_err_str = "Unexpected character.";
return ERR_PARSE_ERROR;
}
}
}
}
return ERR_PARSE_ERROR;
}
Error JSON::_parse_value(Variant &value, Token &token, const char32_t *p_str, int &index, int p_len, int &line, int p_depth, String &r_err_str) {
if (p_depth > Variant::MAX_RECURSION_DEPTH) {
r_err_str = "JSON structure is too deep. Bailing.";
return ERR_OUT_OF_MEMORY;
}
if (token.type == TK_CURLY_BRACKET_OPEN) {
Dictionary d;
Error err = _parse_object(d, p_str, index, p_len, line, p_depth + 1, r_err_str);
if (err) {
return err;
}
value = d;
} else if (token.type == TK_BRACKET_OPEN) {
Array a;
Error err = _parse_array(a, p_str, index, p_len, line, p_depth + 1, r_err_str);
if (err) {
return err;
}
value = a;
} else if (token.type == TK_IDENTIFIER) {
String id = token.value;
if (id == "true") {
value = true;
} else if (id == "false") {
value = false;
} else if (id == "null") {
value = Variant();
} else {
r_err_str = "Expected 'true','false' or 'null', got '" + id + "'.";
return ERR_PARSE_ERROR;
}
} else if (token.type == TK_NUMBER) {
value = token.value;
} else if (token.type == TK_STRING) {
value = token.value;
} else {
r_err_str = "Expected value, got " + String(tk_name[token.type]) + ".";
return ERR_PARSE_ERROR;
}
return OK;
}
Error JSON::_parse_array(Array &array, const char32_t *p_str, int &index, int p_len, int &line, int p_depth, String &r_err_str) {
Token token;
bool need_comma = false;
while (index < p_len) {
Error err = _get_token(p_str, index, p_len, token, line, r_err_str);
if (err != OK) {
return err;
}
if (token.type == TK_BRACKET_CLOSE) {
return OK;
}
if (need_comma) {
if (token.type != TK_COMMA) {
r_err_str = "Expected ','";
return ERR_PARSE_ERROR;
} else {
need_comma = false;
continue;
}
}
Variant v;
err = _parse_value(v, token, p_str, index, p_len, line, p_depth, r_err_str);
if (err) {
return err;
}
array.push_back(v);
need_comma = true;
}
r_err_str = "Expected ']'";
return ERR_PARSE_ERROR;
}
Error JSON::_parse_object(Dictionary &object, const char32_t *p_str, int &index, int p_len, int &line, int p_depth, String &r_err_str) {
bool at_key = true;
String key;
Token token;
bool need_comma = false;
while (index < p_len) {
if (at_key) {
Error err = _get_token(p_str, index, p_len, token, line, r_err_str);
if (err != OK) {
return err;
}
if (token.type == TK_CURLY_BRACKET_CLOSE) {
return OK;
}
if (need_comma) {
if (token.type != TK_COMMA) {
r_err_str = "Expected '}' or ','";
return ERR_PARSE_ERROR;
} else {
need_comma = false;
continue;
}
}
if (token.type != TK_STRING) {
r_err_str = "Expected key";
return ERR_PARSE_ERROR;
}
key = token.value;
err = _get_token(p_str, index, p_len, token, line, r_err_str);
if (err != OK) {
return err;
}
if (token.type != TK_COLON) {
r_err_str = "Expected ':'";
return ERR_PARSE_ERROR;
}
at_key = false;
} else {
Error err = _get_token(p_str, index, p_len, token, line, r_err_str);
if (err != OK) {
return err;
}
Variant v;
err = _parse_value(v, token, p_str, index, p_len, line, p_depth, r_err_str);
if (err) {
return err;
}
object[key] = v;
need_comma = true;
at_key = true;
}
}
r_err_str = "Expected '}'";
return ERR_PARSE_ERROR;
}
void JSON::set_data(const Variant &p_data) {
data = p_data;
text.clear();
}
Error JSON::_parse_string(const String &p_json, Variant &r_ret, String &r_err_str, int &r_err_line) {
const char32_t *str = p_json.ptr();
int idx = 0;
int len = p_json.length();
Token token;
r_err_line = 0;
String aux_key;
Error err = _get_token(str, idx, len, token, r_err_line, r_err_str);
if (err) {
return err;
}
err = _parse_value(r_ret, token, str, idx, len, r_err_line, 0, r_err_str);
// Check if EOF is reached
// or it's a type of the next token.
if (err == OK && idx < len) {
err = _get_token(str, idx, len, token, r_err_line, r_err_str);
if (err || token.type != TK_EOF) {
r_err_str = "Expected 'EOF'";
// Reset return value to empty `Variant`
r_ret = Variant();
return ERR_PARSE_ERROR;
}
}
return err;
}
Error JSON::parse(const String &p_json_string, bool p_keep_text) {
Error err = _parse_string(p_json_string, data, err_str, err_line);
if (err == Error::OK) {
err_line = 0;
}
if (p_keep_text) {
text = p_json_string;
}
return err;
}
String JSON::get_parsed_text() const {
return text;
}
String JSON::stringify(const Variant &p_var, const String &p_indent, bool p_sort_keys, bool p_full_precision) {
Ref<JSON> jason;
jason.instantiate();
HashSet<const void *> markers;
return jason->_stringify(p_var, p_indent, 0, p_sort_keys, markers, p_full_precision);
}
Variant JSON::parse_string(const String &p_json_string) {
Ref<JSON> jason;
jason.instantiate();
Error error = jason->parse(p_json_string);
ERR_FAIL_COND_V_MSG(error != Error::OK, Variant(), vformat("Parse JSON failed. Error at line %d: %s", jason->get_error_line(), jason->get_error_message()));
return jason->get_data();
}
void JSON::_bind_methods() {
ClassDB::bind_static_method("JSON", D_METHOD("stringify", "data", "indent", "sort_keys", "full_precision"), &JSON::stringify, DEFVAL(""), DEFVAL(true), DEFVAL(false));
ClassDB::bind_static_method("JSON", D_METHOD("parse_string", "json_string"), &JSON::parse_string);
ClassDB::bind_method(D_METHOD("parse", "json_text", "keep_text"), &JSON::parse, DEFVAL(false));
ClassDB::bind_method(D_METHOD("get_data"), &JSON::get_data);
ClassDB::bind_method(D_METHOD("set_data", "data"), &JSON::set_data);
ClassDB::bind_method(D_METHOD("get_parsed_text"), &JSON::get_parsed_text);
ClassDB::bind_method(D_METHOD("get_error_line"), &JSON::get_error_line);
ClassDB::bind_method(D_METHOD("get_error_message"), &JSON::get_error_message);
ADD_PROPERTY(PropertyInfo(Variant::NIL, "data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_NIL_IS_VARIANT), "set_data", "get_data"); // Ensures that it can be serialized as binary.
}
////
////////////
Ref<Resource> ResourceFormatLoaderJSON::load(const String &p_path, const String &p_original_path, Error *r_error, bool p_use_sub_threads, float *r_progress, CacheMode p_cache_mode) {
if (r_error) {
*r_error = ERR_FILE_CANT_OPEN;
}
if (!FileAccess::exists(p_path)) {
*r_error = ERR_FILE_NOT_FOUND;
return Ref<Resource>();
}
Ref<JSON> json;
json.instantiate();
Error err = json->parse(FileAccess::get_file_as_string(p_path), Engine::get_singleton()->is_editor_hint());
if (err != OK) {
String err_text = "Error parsing JSON file at '" + p_path + "', on line " + itos(json->get_error_line()) + ": " + json->get_error_message();
if (Engine::get_singleton()->is_editor_hint()) {
// If running on editor, still allow opening the JSON so the code editor can edit it.
WARN_PRINT(err_text);
} else {
if (r_error) {
*r_error = err;
}
ERR_PRINT(err_text);
return Ref<Resource>();
}
}
if (r_error) {
*r_error = OK;
}
return json;
}
void ResourceFormatLoaderJSON::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("json");
}
bool ResourceFormatLoaderJSON::handles_type(const String &p_type) const {
return (p_type == "JSON");
}
String ResourceFormatLoaderJSON::get_resource_type(const String &p_path) const {
String el = p_path.get_extension().to_lower();
if (el == "json") {
return "JSON";
}
return "";
}
Error ResourceFormatSaverJSON::save(const Ref<Resource> &p_resource, const String &p_path, uint32_t p_flags) {
Ref<JSON> json = p_resource;
ERR_FAIL_COND_V(json.is_null(), ERR_INVALID_PARAMETER);
String source = json->get_parsed_text().is_empty() ? JSON::stringify(json->get_data(), "\t", false, true) : json->get_parsed_text();
Error err;
Ref<FileAccess> file = FileAccess::open(p_path, FileAccess::WRITE, &err);
ERR_FAIL_COND_V_MSG(err, err, "Cannot save json '" + p_path + "'.");
file->store_string(source);
if (file->get_error() != OK && file->get_error() != ERR_FILE_EOF) {
return ERR_CANT_CREATE;
}
return OK;
}
void ResourceFormatSaverJSON::get_recognized_extensions(const Ref<Resource> &p_resource, List<String> *p_extensions) const {
Ref<JSON> json = p_resource;
if (json.is_valid()) {
p_extensions->push_back("json");
}
}
bool ResourceFormatSaverJSON::recognize(const Ref<Resource> &p_resource) const {
return p_resource->get_class_name() == "JSON"; //only json, not inherited
}
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