d8223ffa75
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!
(cherry picked from commit c7bc44d5ad)
478 lines
10 KiB
C++
478 lines
10 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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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 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 "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::_print_var(const Variant& p_var) {
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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::INT_ARRAY:
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case Variant::REAL_ARRAY:
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case Variant::STRING_ARRAY:
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case Variant::ARRAY: {
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String s = "[";
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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+=_print_var(a[i]);
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}
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s+="]";
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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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Dictionary d = p_var;
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List<Variant> keys;
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d.get_key_list(&keys);
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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+=_print_var(String(E->get()));
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s+=":";
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s+=_print_var(d[E->get()]);
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}
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s+="}";
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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 Dictionary& p_dict) {
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return _print_var(p_dict);
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}
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Error JSON::_get_token(const CharType *p_str, int &idx, int p_len, Token& r_token,int &line,String &r_err_str) {
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while (true) {
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switch(p_str[idx]) {
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case '\n': {
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line++;
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idx++;
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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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idx++;
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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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idx++;
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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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idx++;
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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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idx++;
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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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idx++;
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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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idx++;
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return OK;
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};
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case '"': {
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idx++;
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String str;
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while(true) {
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if (p_str[idx]==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[idx]=='"') {
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idx++;
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break;
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} else if (p_str[idx]=='\\') {
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//escaped characters...
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idx++;
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CharType next = p_str[idx];
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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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//hexnumbarh - oct is deprecated
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for(int j=0;j<4;j++) {
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CharType c = p_str[idx+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");
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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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idx+=4; //will add at the end anyway
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} break;
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//case '\"': res='\"'; break;
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//case '\\': res='\\'; break;
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//case '/': res='/'; break;
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default: {
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res = next;
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//r_err_str="Invalid escape sequence";
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//return ERR_PARSE_ERROR;
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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[idx]=='\n')
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line++;
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str+=p_str[idx];
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}
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idx++;
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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[idx]<=32) {
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idx++;
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break;
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}
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if (p_str[idx]=='-' || (p_str[idx]>='0' && p_str[idx]<='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[idx],&rptr);
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idx+=(rptr - &p_str[idx]);
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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[idx]>='A' && p_str[idx]<='Z') || (p_str[idx]>='a' && p_str[idx]<='z')) {
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String id;
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while((p_str[idx]>='A' && p_str[idx]<='Z') || (p_str[idx]>='a' && p_str[idx]<='z')) {
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id+=p_str[idx];
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idx++;
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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(true);
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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(true);
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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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return ERR_PARSE_ERROR;
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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 OK;
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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 OK;
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}
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Error JSON::parse(const String& p_json,Dictionary& 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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int line=0;
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String aux_key;
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Error err = _get_token(str,idx,len,token,line,r_err_str);
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if (err)
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return err;
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if (token.type!=TK_CURLY_BRACKET_OPEN) {
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r_err_str="Expected '{'";
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return ERR_PARSE_ERROR;
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}
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return _parse_object(r_ret,str,idx,len,r_err_line,r_err_str);
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}
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