470 lines
11 KiB
C++
470 lines
11 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) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 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/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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static String _make_indent(const String &p_indent, int p_size) {
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String indent_text = "";
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if (!p_indent.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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return indent_text;
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}
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String JSON::_print_var(const Variant &p_var, const String &p_indent, int p_cur_indent, bool p_sort_keys) {
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String colon = ":";
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String end_statement = "";
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if (!p_indent.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: return "null";
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case Variant::BOOL: return p_var.operator bool() ? "true" : "false";
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case Variant::INT: return itos(p_var);
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case Variant::REAL: return rtos(p_var);
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case Variant::PACKED_INT_ARRAY:
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case Variant::PACKED_REAL_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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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) + _print_var(a[i], p_indent, p_cur_indent + 1, p_sort_keys);
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}
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s += end_statement + _make_indent(p_indent, p_cur_indent) + "]";
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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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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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for (List<Variant>::Element *E = keys.front(); E; E = E->next()) {
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if (E != keys.front()) {
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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) + _print_var(String(E->get()), p_indent, p_cur_indent + 1, p_sort_keys);
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s += colon;
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s += _print_var(d[E->get()], p_indent, p_cur_indent + 1, p_sort_keys);
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}
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s += end_statement + _make_indent(p_indent, p_cur_indent) + "}";
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return s;
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};
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default: return "\"" + String(p_var).json_escape() + "\"";
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}
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}
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String JSON::print(const Variant &p_var, const String &p_indent, bool p_sort_keys) {
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return _print_var(p_var, p_indent, 0, p_sort_keys);
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}
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Error JSON::_get_token(const CharType *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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CharType 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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CharType res = 0;
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switch (next) {
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case 'b': res = 8; break;
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case 't': res = 9; break;
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case 'n': res = 10; break;
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case 'f': res = 12; break;
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case 'r': res = 13; 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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CharType 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 (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'))) {
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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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CharType v;
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if (c >= '0' && c <= '9') {
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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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} 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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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] == '-' || (p_str[index] >= '0' && p_str[index] <= '9')) {
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//a number
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const CharType *rptr;
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double number = String::to_double(&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 ((p_str[index] >= 'A' && p_str[index] <= 'Z') || (p_str[index] >= 'a' && p_str[index] <= 'z')) {
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String id;
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while ((p_str[index] >= 'A' && p_str[index] <= 'Z') || (p_str[index] >= 'a' && p_str[index] <= 'z')) {
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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 CharType *p_str, int &index, int p_len, int &line, String &r_err_str) {
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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, r_err_str);
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if (err)
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return err;
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value = d;
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return OK;
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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, r_err_str);
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if (err)
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return err;
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value = a;
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return OK;
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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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return OK;
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} else if (token.type == TK_NUMBER) {
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value = token.value;
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return OK;
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} else if (token.type == TK_STRING) {
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value = token.value;
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return OK;
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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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}
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Error JSON::_parse_array(Array &array, const CharType *p_str, int &index, int p_len, int &line, 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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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, r_err_str);
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if (err)
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return err;
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array.push_back(v);
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need_comma = true;
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}
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return ERR_PARSE_ERROR;
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}
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Error JSON::_parse_object(Dictionary &object, const CharType *p_str, int &index, int p_len, int &line, 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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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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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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Variant v;
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err = _parse_value(v, token, p_str, index, p_len, line, r_err_str);
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if (err)
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return err;
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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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return ERR_PARSE_ERROR;
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}
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Error JSON::parse(const String &p_json, Variant &r_ret, String &r_err_str, int &r_err_line) {
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const CharType *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, r_err_str);
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return err;
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}
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