/**
* Allocates a fresh unused token from the token pull.
*/
private jsmntok_t jsmn_alloc_token(ref jsmn_parser parser, ref jsmntok_t[] tokens, uint num_tokens)
{
jsmntok_t tok = new jsmntok_t();;
if (parser.toknext >= num_tokens)
{
return(null);
}
//tok = tokens[parser.toknext++];
tok.start = tok.end = -1;
tok.size = 0;
tokens[parser.toknext++] = tok;
return(tok);
}
/**
* Fills next available token with JSON primitive.
*/
private int jsmn_parse_primitive(ref jsmn_parser parser, char[] js, uint len, jsmntok_t[] tokens, uint num_tokens)
{
jsmntok_t token = new jsmntok_t();
int start;
start = parser.pos;
for (; parser.pos < len && js[parser.pos] != '\0'; parser.pos++)
{
switch (js[parser.pos])
{
case '\t':
case '\r':
case '\n':
case ' ':
case ',':
case ']':
case '}':
goto found;
}
if (js[parser.pos] < 32 || js[parser.pos] >= 127)
{
parser.pos = start;
return((int)jsmnerr_t.JSMN_ERROR_INVAL);
}
}
found:
if (tokens == null)
{
parser.pos--;
return(0);
}
token = jsmn_alloc_token(ref parser, ref tokens, num_tokens);
if (token == null)
{
parser.pos = start;
return((int)jsmnerr_t.JSMN_ERROR_NOMEM);
}
jsmn_fill_token(ref token, jsmntype_t.JSMN_PRIMITIVE, start, parser.pos);
parser.pos--;
return(0);
}
/**
* Filsl next token with JSON string.
*/
private int jsmn_parse_string(ref jsmn_parser parser, char[] js, uint len, jsmntok_t[] tokens, uint num_tokens)
{
jsmntok_t token;
int start = parser.pos;
parser.pos++;
/* Skip starting quote */
for (; parser.pos < len && js[parser.pos] != '\0'; parser.pos++)
{
char c = js[parser.pos];
/* Quote: end of string */
if (c == '\"')
{
if (tokens == null)
{
return(0);
}
token = jsmn_alloc_token(ref parser, ref tokens, num_tokens);
if (token == null)
{
parser.pos = start;
return((int)jsmnerr_t.JSMN_ERROR_NOMEM);
}
jsmn_fill_token(ref token, jsmntype_t.JSMN_STRING, start + 1, parser.pos);
return(0);
}
/* Backslash: Quoted symbol expected */
if (c == '\\' && parser.pos + 1 < len)
{
int i;
parser.pos++;
//char temp = js[parser.pos-1];
switch (js[parser.pos - 1])
{
/* Allowed escaped symbols */
case '\"':
case '/':
case '\\':
case 'b':
case 'f':
case 'r':
case 'n':
case 't':
//Console.WriteLine("Enter");
break;
/* Allows escaped symbol \uXXXX */
case 'u':
parser.pos++;
for (i = 0; i < 4 && parser.pos < len && js[parser.pos] != '\0'; i++)
{
/* If it isn't a hex character we have an error */
if (!((js[parser.pos] >= 48 && js[parser.pos] <= 57) || /* 0-9 */
(js[parser.pos] >= 65 && js[parser.pos] <= 70) || /* A-F */
(js[parser.pos] >= 97 && js[parser.pos] <= 102)))
{ /* a-f */
parser.pos = start;
return((int)jsmnerr_t.JSMN_ERROR_INVAL);
}
parser.pos++;
}
parser.pos--;
break;
/* Unexpected symbol */
default:
parser.pos = start;
return((int)jsmnerr_t.JSMN_ERROR_INVAL);
}
}
}
parser.pos = start;
return((int)jsmnerr_t.JSMN_ERROR_PART);
}
/**
* Creates a new parser based over a given buffer with an array of tokens
* available.
*/
public void jsmn_init(ref jsmn_parser parser)
{
parser.pos = 0;
parser.toknext = 0;
parser.toksuper = -1;
}
/**
* Parse JSON string and fill tokens.
*/
public int jsmn_parse(ref jsmn_parser parser, char[] js, uint len, ref jsmntok_t[] tokens, uint num_tokens)
{
int r;
int i;
jsmntok_t token;
int count = 0;
for (; parser.pos < len && js[parser.pos] != '\0'; parser.pos++)
{
char c;
jsmntype_t type;
c = js[parser.pos];
switch (c)
{
case '{':
case '[':
count++;
if (tokens == null)
{
break;
}
token = jsmn_alloc_token(ref parser, ref tokens, num_tokens);
if (token == null)
{
return((int)jsmnerr_t.JSMN_ERROR_NOMEM);
}
if (parser.toksuper != -1)
{
tokens[parser.toksuper].size++;
}
token.type = (c == '{' ? jsmntype_t.JSMN_OBJECT : jsmntype_t.JSMN_ARRAY);
token.start = parser.pos;
parser.toksuper = parser.toknext - 1;
break;
case '}':
case ']':
if (tokens == null)
{
break;
}
type = (c == '}' ? jsmntype_t.JSMN_OBJECT : jsmntype_t.JSMN_ARRAY);
for (i = parser.toknext - 1; i >= 0; i--)
{
//token = tokens[i];
if (tokens[i].start != -1 && tokens[i].end == -1)
{
if (tokens[i].type != type)
{
return((int)jsmnerr_t.JSMN_ERROR_INVAL);
}
parser.toksuper = -1;
tokens[i].end = parser.pos + 1;
break;
}
}
/* Error if unmatched closing bracket */
if (i == -1)
{
return((int)jsmnerr_t.JSMN_ERROR_INVAL);
}
for (; i >= 0; i--)
{
//token = &tokens[i];
if (tokens[i].start != -1 && tokens[i].end == -1)
{
parser.toksuper = i;
break;
}
}
break;
case '\"':
r = jsmn_parse_string(ref parser, js, len, tokens, num_tokens);
if (r < 0)
{
return(r);
}
count++;
if (parser.toksuper != -1 && tokens != null)
{
tokens[parser.toksuper].size++;
}
break;
case '\t':
case '\r':
case '\n':
case ' ':
break;
case ':':
parser.toksuper = parser.toknext - 1;
break;
case ',':
if (tokens != null &&
tokens[parser.toksuper].type != jsmntype_t.JSMN_ARRAY &&
tokens[parser.toksuper].type != jsmntype_t.JSMN_OBJECT)
{
for (i = parser.toknext - 1; i >= 0; i--)
{
if (tokens[i].type == jsmntype_t.JSMN_ARRAY || tokens[i].type == jsmntype_t.JSMN_OBJECT)
{
if (tokens[i].start != -1 && tokens[i].end == -1)
{
parser.toksuper = i;
break;
}
}
}
}
break;
/* In non-strict mode every unquoted value is a primitive */
default:
r = jsmn_parse_primitive(ref parser, js, len, tokens, num_tokens);
if (r < 0)
{
return(r);
}
count++;
if (parser.toksuper != -1 && tokens != null)
{
tokens[parser.toksuper].size++;
}
break;
}
}
for (i = parser.toknext - 1; i >= 0; i--)
{
/* Unmatched opened object or array */
if (tokens[i].start != -1 && tokens[i].end == -1)
{
return((int)jsmnerr_t.JSMN_ERROR_PART);
}
}
return(count);
}
