d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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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|
}
|
|
|
|
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) {
|
|
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
|
|
}
|