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js0n.c
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js0n.c
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#include "js0n.h"
/* this code is based on the work by jeremie miller, which is part of the public domain
* git://github.com/quartzjer/js0n.git */
#define CASES_a_TO_z \
'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g': case 'h':\
case 'i': case 'j': case 'k': case 'l': case 'm': case 'n': case 'o': case 'p':\
case 'q': case 'r': case 's': case 't': case 'u': case 'v': case 'w': case 'x':\
case 'y': case 'z'
#define CASES_A_TO_Z \
'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G': case 'H':\
case 'I': case 'J': case 'K': case 'L': case 'M': case 'N': case 'O': case 'P':\
case 'Q': case 'R': case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':\
case 'Y': case 'Z'
#define CASES_0_TO_9 \
'0': case '1': case '2': case '3': case '4': case '5': case '6': case '7':\
case '8': case '9'
#define CASES_ALL_SYMBOLS \
' ': case '!': case '"': case '#': case '$': case '%': case '&': case '\'':\
case '(': case ')': case '*': case '+': case ',': case '-': case '.': case '/':\
case ':': case ';': case '<': case '=': case '>': case '?': case '@': case '[':\
case '\\': case ']': case '^': case '_': case '{': case '|': case '}': case '~'
#define CASES_VALID_STRING_SYMBOLS \
' ': case '!': /*case '"':*/ case '#': case '$': case '%': case '&': case '\'':\
case '(': case ')': case '*': case '+': case ',': case '-': case '.': case '/':\
case ':': case ';': case '<': case '=': case '>': case '?': case '@': case '[':\
/*case '\\':*/ case ']': case '^': case '_': case '{': case '|': case '}': case '~'
#define CASES_VALID_BARE_SYMBOLS \
'!': /*case ' ':*/ case '"': case '#': case '$': case '%': case '&': case '\'':\
case '(': case ')': case '*': case '+': /*case ',':*/ case '-': case '.': case '/':\
case ':': case ';': case '<': case '=': case '>': case '?': case '@': case '[':\
case '\\': /*case ']':*/ case '^': case '_': case '{': case '|': /*case '}':*/ case '~'
#define CASES_CONTROL_CHARACTERS \
0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:\
case 8: case 9: case 10: case 11: case 12: case 13: case 14: case 15:\
case 16: case 17: case 18: case 19: case 20: case 21: case 22: case 23:\
case 24: case 25: case 26: case 27: case 28: case 29: case 30: case 31
#define CASES_UTF8_1 \
128: case 129: case 130: case 131: case 132: case 133: case 134: case 135:\
case 136: case 137: case 138: case 139: case 140: case 141: case 142: case 143:\
case 144: case 145: case 146: case 147: case 148: case 149: case 150: case 151:\
case 152: case 153: case 154: case 155: case 156: case 157: case 158: case 159:\
case 160: case 161: case 162: case 163: case 164: case 165: case 166: case 167:\
case 168: case 169: case 170: case 171: case 172: case 173: case 174: case 175:\
case 176: case 177: case 178: case 179: case 180: case 181: case 182: case 183:\
case 184: case 185: case 186: case 187: case 188: case 189: case 190: case 191
#define CASES_UTF8_2 \
192: case 193: case 194: case 195: case 196: case 197: case 198: case 199:\
case 200: case 201: case 202: case 203: case 204: case 205: case 206: case 207:\
case 208: case 209: case 210: case 211: case 212: case 213: case 214: case 215:\
case 216: case 217: case 218: case 219: case 220: case 221: case 222: case 223
#define CASES_UTF8_3 \
224: case 225: case 226: case 227: case 228: case 229: case 230: case 231:\
case 232: case 233: case 234: case 235: case 236: case 237: case 238: case 239
#define CASES_UTF8_4 \
240: case 241: case 242: case 243: case 244: case 245: case 246: case 247
typedef enum
{
JS0N_STATE_GOSTRUCT = 0,
JS0N_STATE_GOBARE = 1,
JS0N_STATE_GOSTRING = 2,
JS0N_STATE_GOUTF8_CONTINUE = 3,
JS0N_STATE_GOESC = 4,
} js0n_gostate_t;
void PUSH ( js0n_parser_t * parser, int refpos )
{
if ( parser->depth == 1 )
{
parser->mark = ( parser->cursor + refpos );
}
}
void CAP ( js0n_parser_t * parser, int refpos )
{
uint16_t length;
if ( parser->depth == 1 )
{
length = ( ( ( parser->cursor + refpos ) - parser->mark ) + 1 );
/* notify the user */
parser->user_cb ( parser->mark, length );
parser->mark = ( parser->cursor + refpos );
}
}
int l_loop ( js0n_parser_t * parser )
{
++parser->cursor;
return 0;
}
int l_bad ( js0n_parser_t * parser )
{
return 1;
}
int l_up ( js0n_parser_t * parser )
{
PUSH ( parser, 0 );
++parser->depth;
++parser->cursor;
return 0;
}
int l_down ( js0n_parser_t * parser )
{
--parser->depth;
CAP ( parser, 0 );
++parser->cursor;
return 0;
}
int l_qup ( js0n_parser_t * parser )
{
PUSH ( parser, 1 );
parser->gostate = JS0N_STATE_GOSTRING;
++parser->cursor;
return 0;
}
int l_qdown ( js0n_parser_t * parser )
{
CAP ( parser, -1 );
parser->gostate = JS0N_STATE_GOSTRUCT;
++parser->cursor;
return 0;
}
int l_esc ( js0n_parser_t * parser )
{
parser->gostate = JS0N_STATE_GOESC;
++parser->cursor;
return 0;
}
int l_unesc ( js0n_parser_t * parser )
{
parser->gostate = JS0N_STATE_GOSTRING;
++parser->cursor;
return 0;
}
int l_bare ( js0n_parser_t * parser )
{
PUSH ( parser, 0 );
parser->gostate = JS0N_STATE_GOBARE;
++parser->cursor;
return 0;
}
int l_unbare ( js0n_parser_t * parser )
{
CAP ( parser, -1 );
parser->gostate = JS0N_STATE_GOSTRUCT;
return 0;
}
int l_utf8_2 ( js0n_parser_t * parser )
{
parser->gostate = JS0N_STATE_GOUTF8_CONTINUE;
parser->utf8_remain = 1;
++parser->cursor;
return 0;
}
int l_utf8_3 ( js0n_parser_t * parser )
{
parser->gostate = JS0N_STATE_GOUTF8_CONTINUE;
parser->utf8_remain = 2;
++parser->cursor;
return 0;
}
int l_utf8_4 ( js0n_parser_t * parser )
{
parser->gostate = JS0N_STATE_GOUTF8_CONTINUE;
parser->utf8_remain = 3;
++parser->cursor;
return 0;
}
int l_utf_continue ( js0n_parser_t * parser )
{
if ( !--parser->utf8_remain )
{
parser->gostate = JS0N_STATE_GOSTRING;
}
++parser->cursor;
return 0;
}
int js0n_parse ( js0n_parser_t * parser )
{
int ret;
parser->mark = 0;
parser->depth = 0;
parser->utf8_remain = 0;
parser->cursor = parser->js;
parser->gostate = JS0N_STATE_GOSTRUCT;
while ( parser->cursor <= ( parser->js + parser->length ) )
{
switch ( parser->gostate )
{
case JS0N_STATE_GOSTRUCT:
switch ( *parser->cursor )
{
case '\t':
case ' ':
case '\r':
case '\n':
case ':':
case ',':
ret = l_loop ( parser );
break;
case '"':
ret = l_qup ( parser );
break;
case '[':
case '{':
ret = l_up ( parser );
break;
case ']':
case '}':
ret = l_down ( parser );
break;
case '-':
case 't':
case 'f':
case 'n':
case CASES_0_TO_9:
ret = l_bare ( parser );
break;
default:
ret = l_bad ( parser );
break;
}
break;
case JS0N_STATE_GOBARE:
switch ( *parser->cursor )
{
case CASES_a_TO_z:
case CASES_A_TO_Z:
case CASES_0_TO_9:
case CASES_VALID_BARE_SYMBOLS:
ret = l_loop ( parser );
break;
case '\t':
case ' ':
case '\r':
case '\n':
case ',':
case ']':
case '}':
ret = l_unbare ( parser );
break;
default:
ret = l_bad ( parser );
break;
}
break;
case JS0N_STATE_GOSTRING:
switch ( *parser->cursor )
{
case CASES_a_TO_z:
case CASES_A_TO_Z:
case CASES_0_TO_9:
case CASES_VALID_STRING_SYMBOLS:
ret = l_loop ( parser );
break;
case '\\':
ret = l_esc ( parser );
break;
case '"':
ret = l_qdown ( parser );
break;
case CASES_UTF8_2:
ret = l_utf8_2 ( parser );
break;
case CASES_UTF8_3:
ret = l_utf8_3 ( parser );
break;
case CASES_UTF8_4:
ret = l_utf8_4 ( parser );
break;
default:
ret = l_bad ( parser );
break;
}
break;
case JS0N_STATE_GOUTF8_CONTINUE:
switch ( *parser->cursor )
{
case CASES_UTF8_1:
ret = l_utf_continue ( parser );
break;
default:
ret = l_bad ( parser );
break;
}
case JS0N_STATE_GOESC:
switch ( *parser->cursor )
{
case '"':
case '\\':
case '/':
case 'b':
case 'f':
case 'n':
case 'r':
case 't':
case 'u':
ret = l_unesc ( parser );
break;
default:
ret = l_bad ( parser );
break;
}
break;
}
if ( ret ) return -1;
}
return parser->depth; // 0 if successful full parse, >0 for incomplete data
}