655 lines
18 KiB
C++
655 lines
18 KiB
C++
/*************************************************************************/
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/* json.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "json.h"
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#include "core/string/print_string.h"
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const char *JSON::tk_name[TK_MAX] = {
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"'{'",
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"'}'",
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"'['",
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"']'",
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"identifier",
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"string",
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"number",
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"':'",
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"','",
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"EOF",
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};
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String JSON::_make_indent(const String &p_indent, int p_size) {
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String indent_text = "";
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if (!p_indent.is_empty()) {
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for (int i = 0; i < p_size; i++) {
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indent_text += p_indent;
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}
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}
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return indent_text;
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}
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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) {
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ERR_FAIL_COND_V_MSG(p_cur_indent > Variant::MAX_RECURSION_DEPTH, "...", "JSON structure is too deep. Bailing.");
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String colon = ":";
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String end_statement = "";
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if (!p_indent.is_empty()) {
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colon += " ";
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end_statement += "\n";
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}
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switch (p_var.get_type()) {
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case Variant::NIL:
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return "null";
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case Variant::BOOL:
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return p_var.operator bool() ? "true" : "false";
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case Variant::INT:
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return itos(p_var);
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case Variant::FLOAT: {
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double num = p_var;
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if (p_full_precision) {
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// Store unreliable digits (17) instead of just reliable
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// digits (14) so that the value can be decoded exactly.
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return String::num(num, 17 - (int)floor(log10(num)));
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} else {
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// Store only reliable digits (14) by default.
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return String::num(num, 14 - (int)floor(log10(num)));
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}
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}
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case Variant::PACKED_INT32_ARRAY:
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case Variant::PACKED_INT64_ARRAY:
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case Variant::PACKED_FLOAT32_ARRAY:
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case Variant::PACKED_FLOAT64_ARRAY:
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case Variant::PACKED_STRING_ARRAY:
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case Variant::ARRAY: {
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String s = "[";
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s += end_statement;
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Array a = p_var;
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ERR_FAIL_COND_V_MSG(p_markers.has(a.id()), "\"[...]\"", "Converting circular structure to JSON.");
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p_markers.insert(a.id());
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for (int i = 0; i < a.size(); i++) {
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if (i > 0) {
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s += ",";
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s += end_statement;
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}
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s += _make_indent(p_indent, p_cur_indent + 1) + _stringify(a[i], p_indent, p_cur_indent + 1, p_sort_keys, p_markers);
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}
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s += end_statement + _make_indent(p_indent, p_cur_indent) + "]";
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p_markers.erase(a.id());
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return s;
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}
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case Variant::DICTIONARY: {
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String s = "{";
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s += end_statement;
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Dictionary d = p_var;
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ERR_FAIL_COND_V_MSG(p_markers.has(d.id()), "\"{...}\"", "Converting circular structure to JSON.");
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p_markers.insert(d.id());
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List<Variant> keys;
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d.get_key_list(&keys);
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if (p_sort_keys) {
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keys.sort();
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}
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bool first_key = true;
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for (const Variant &E : keys) {
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if (first_key) {
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first_key = false;
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} else {
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s += ",";
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s += end_statement;
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}
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s += _make_indent(p_indent, p_cur_indent + 1) + _stringify(String(E), p_indent, p_cur_indent + 1, p_sort_keys, p_markers);
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s += colon;
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s += _stringify(d[E], p_indent, p_cur_indent + 1, p_sort_keys, p_markers);
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}
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s += end_statement + _make_indent(p_indent, p_cur_indent) + "}";
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p_markers.erase(d.id());
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return s;
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}
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default:
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return "\"" + String(p_var).json_escape() + "\"";
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}
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}
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Error JSON::_get_token(const char32_t *p_str, int &index, int p_len, Token &r_token, int &line, String &r_err_str) {
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while (p_len > 0) {
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switch (p_str[index]) {
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case '\n': {
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line++;
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index++;
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break;
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}
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case 0: {
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r_token.type = TK_EOF;
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return OK;
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} break;
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case '{': {
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r_token.type = TK_CURLY_BRACKET_OPEN;
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index++;
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return OK;
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}
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case '}': {
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r_token.type = TK_CURLY_BRACKET_CLOSE;
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index++;
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return OK;
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}
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case '[': {
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r_token.type = TK_BRACKET_OPEN;
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index++;
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return OK;
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}
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case ']': {
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r_token.type = TK_BRACKET_CLOSE;
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index++;
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return OK;
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}
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case ':': {
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r_token.type = TK_COLON;
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index++;
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return OK;
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}
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case ',': {
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r_token.type = TK_COMMA;
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index++;
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return OK;
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}
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case '"': {
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index++;
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String str;
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while (true) {
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if (p_str[index] == 0) {
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r_err_str = "Unterminated String";
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return ERR_PARSE_ERROR;
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} else if (p_str[index] == '"') {
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index++;
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break;
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} else if (p_str[index] == '\\') {
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//escaped characters...
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index++;
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char32_t next = p_str[index];
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if (next == 0) {
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r_err_str = "Unterminated String";
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return ERR_PARSE_ERROR;
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}
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char32_t res = 0;
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switch (next) {
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case 'b':
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res = 8;
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break;
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case 't':
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res = 9;
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break;
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case 'n':
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res = 10;
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break;
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case 'f':
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res = 12;
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break;
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case 'r':
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res = 13;
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break;
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case 'u': {
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// hex number
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for (int j = 0; j < 4; j++) {
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char32_t c = p_str[index + j + 1];
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if (c == 0) {
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r_err_str = "Unterminated String";
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return ERR_PARSE_ERROR;
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}
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if (!is_hex_digit(c)) {
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r_err_str = "Malformed hex constant in string";
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return ERR_PARSE_ERROR;
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}
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char32_t v;
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if (is_digit(c)) {
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v = c - '0';
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} else if (c >= 'a' && c <= 'f') {
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v = c - 'a';
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v += 10;
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} else if (c >= 'A' && c <= 'F') {
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v = c - 'A';
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v += 10;
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} else {
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ERR_PRINT("Bug parsing hex constant.");
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v = 0;
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}
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res <<= 4;
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res |= v;
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}
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index += 4; //will add at the end anyway
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if ((res & 0xfffffc00) == 0xd800) {
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if (p_str[index + 1] != '\\' || p_str[index + 2] != 'u') {
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r_err_str = "Invalid UTF-16 sequence in string, unpaired lead surrogate";
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return ERR_PARSE_ERROR;
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}
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index += 2;
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char32_t trail = 0;
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for (int j = 0; j < 4; j++) {
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char32_t c = p_str[index + j + 1];
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if (c == 0) {
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r_err_str = "Unterminated String";
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return ERR_PARSE_ERROR;
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}
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if (!is_hex_digit(c)) {
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r_err_str = "Malformed hex constant in string";
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return ERR_PARSE_ERROR;
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}
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char32_t v;
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if (is_digit(c)) {
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v = c - '0';
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} else if (c >= 'a' && c <= 'f') {
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v = c - 'a';
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v += 10;
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} else if (c >= 'A' && c <= 'F') {
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v = c - 'A';
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v += 10;
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} else {
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ERR_PRINT("Bug parsing hex constant.");
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v = 0;
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}
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trail <<= 4;
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trail |= v;
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}
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if ((trail & 0xfffffc00) == 0xdc00) {
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res = (res << 10UL) + trail - ((0xd800 << 10UL) + 0xdc00 - 0x10000);
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index += 4; //will add at the end anyway
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} else {
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r_err_str = "Invalid UTF-16 sequence in string, unpaired lead surrogate";
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return ERR_PARSE_ERROR;
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}
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} else if ((res & 0xfffffc00) == 0xdc00) {
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r_err_str = "Invalid UTF-16 sequence in string, unpaired trail surrogate";
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return ERR_PARSE_ERROR;
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}
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} break;
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default: {
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res = next;
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} break;
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}
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str += res;
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} else {
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if (p_str[index] == '\n') {
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line++;
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}
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str += p_str[index];
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}
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index++;
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}
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r_token.type = TK_STRING;
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r_token.value = str;
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return OK;
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} break;
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default: {
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if (p_str[index] <= 32) {
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index++;
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break;
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}
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if (p_str[index] == '-' || is_digit(p_str[index])) {
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//a number
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const char32_t *rptr;
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double number = String::to_float(&p_str[index], &rptr);
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index += (rptr - &p_str[index]);
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r_token.type = TK_NUMBER;
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r_token.value = number;
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return OK;
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} else if (is_ascii_char(p_str[index])) {
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String id;
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while (is_ascii_char(p_str[index])) {
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id += p_str[index];
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index++;
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}
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r_token.type = TK_IDENTIFIER;
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r_token.value = id;
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return OK;
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} else {
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r_err_str = "Unexpected character.";
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return ERR_PARSE_ERROR;
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}
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}
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}
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}
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return ERR_PARSE_ERROR;
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}
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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) {
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if (p_depth > Variant::MAX_RECURSION_DEPTH) {
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r_err_str = "JSON structure is too deep. Bailing.";
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return ERR_OUT_OF_MEMORY;
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}
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if (token.type == TK_CURLY_BRACKET_OPEN) {
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Dictionary d;
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Error err = _parse_object(d, p_str, index, p_len, line, p_depth + 1, r_err_str);
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if (err) {
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return err;
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}
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value = d;
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} else if (token.type == TK_BRACKET_OPEN) {
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Array a;
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Error err = _parse_array(a, p_str, index, p_len, line, p_depth + 1, r_err_str);
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if (err) {
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return err;
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}
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value = a;
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} else if (token.type == TK_IDENTIFIER) {
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String id = token.value;
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if (id == "true") {
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value = true;
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} else if (id == "false") {
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value = false;
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} else if (id == "null") {
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value = Variant();
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} else {
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r_err_str = "Expected 'true','false' or 'null', got '" + id + "'.";
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return ERR_PARSE_ERROR;
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}
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} else if (token.type == TK_NUMBER) {
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value = token.value;
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} else if (token.type == TK_STRING) {
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value = token.value;
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} else {
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r_err_str = "Expected value, got " + String(tk_name[token.type]) + ".";
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return ERR_PARSE_ERROR;
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}
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return OK;
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}
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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) {
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Token token;
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bool need_comma = false;
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while (index < p_len) {
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Error err = _get_token(p_str, index, p_len, token, line, r_err_str);
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if (err != OK) {
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return err;
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}
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if (token.type == TK_BRACKET_CLOSE) {
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return OK;
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}
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if (need_comma) {
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if (token.type != TK_COMMA) {
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r_err_str = "Expected ','";
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return ERR_PARSE_ERROR;
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} else {
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need_comma = false;
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continue;
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}
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}
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Variant v;
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err = _parse_value(v, token, p_str, index, p_len, line, p_depth, r_err_str);
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if (err) {
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return err;
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}
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array.push_back(v);
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need_comma = true;
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}
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r_err_str = "Expected ']'";
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return ERR_PARSE_ERROR;
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}
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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) {
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bool at_key = true;
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String key;
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Token token;
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bool need_comma = false;
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while (index < p_len) {
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if (at_key) {
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Error err = _get_token(p_str, index, p_len, token, line, r_err_str);
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if (err != OK) {
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return err;
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}
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if (token.type == TK_CURLY_BRACKET_CLOSE) {
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return OK;
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}
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if (need_comma) {
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if (token.type != TK_COMMA) {
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r_err_str = "Expected '}' or ','";
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return ERR_PARSE_ERROR;
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} else {
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need_comma = false;
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continue;
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}
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}
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if (token.type != TK_STRING) {
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r_err_str = "Expected key";
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return ERR_PARSE_ERROR;
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}
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key = token.value;
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err = _get_token(p_str, index, p_len, token, line, r_err_str);
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if (err != OK) {
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return err;
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}
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if (token.type != TK_COLON) {
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r_err_str = "Expected ':'";
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return ERR_PARSE_ERROR;
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}
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at_key = false;
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} else {
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Error err = _get_token(p_str, index, p_len, token, line, r_err_str);
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if (err != OK) {
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return err;
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}
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Variant v;
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err = _parse_value(v, token, p_str, index, p_len, line, p_depth, r_err_str);
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if (err) {
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return err;
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}
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object[key] = v;
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need_comma = true;
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at_key = true;
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}
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}
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r_err_str = "Expected '}'";
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return ERR_PARSE_ERROR;
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}
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void JSON::set_data(const Variant &p_data) {
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data = p_data;
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}
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Error JSON::_parse_string(const String &p_json, Variant &r_ret, String &r_err_str, int &r_err_line) {
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const char32_t *str = p_json.ptr();
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int idx = 0;
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int len = p_json.length();
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Token token;
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r_err_line = 0;
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String aux_key;
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Error err = _get_token(str, idx, len, token, r_err_line, r_err_str);
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if (err) {
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return err;
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}
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err = _parse_value(r_ret, token, str, idx, len, r_err_line, 0, r_err_str);
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// Check if EOF is reached
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// or it's a type of the next token.
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if (err == OK && idx < len) {
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err = _get_token(str, idx, len, token, r_err_line, r_err_str);
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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) {
|
|
Error err = _parse_string(p_json_string, data, err_str, err_line);
|
|
if (err == Error::OK) {
|
|
err_line = 0;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
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_string"), &JSON::parse);
|
|
|
|
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_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));
|
|
if (err != OK) {
|
|
if (r_error) {
|
|
*r_error = err;
|
|
}
|
|
ERR_PRINT("Error parsing JSON file at '" + p_path + "', on line " + itos(json->get_error_line()) + ": " + json->get_error_message());
|
|
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::stringify(json->get_data(), "\t", false, true);
|
|
|
|
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
|
|
}
|