/**
* Filsl next token with JSON string.
*/
static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
jsmntok_t *tokens, size_t num_tokens)
{
jsmntok_t *token;
int start = parser->pos;
parser->pos++;
/* Skip starting quote */
for (; js[parser->pos] != '\0'; parser->pos++)
{
char c = js[parser->pos];
/* Quote: end of string */
if (c == '\"')
{
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL)
{
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
if(js[parser->pos + 1] == ':')
{
jsmn_fill_token(token, JSMN_NAME, start+1, parser->pos);
}
else
{
jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
}
return JSMN_SUCCESS;
}
/* Backslash: Quoted symbol expected */
if (c == '\\')
{
parser->pos++;
switch (js[parser->pos])
{
/* Allowed escaped symbols */
case '\"': case '/' : case '\\' : case 'b' :
case 'f' : case 'r' : case 'n' : case 't' :
break;
/* Allows escaped symbol \uXXXX */
case 'u':
/* TODO */
break;
/* Unexpected symbol */
default:
parser->pos = start;
return JSMN_ERROR_INVAL;
}
}
}
parser->pos = start;
return JSMN_ERROR_PART;
}
/**
* Filsl next token with JSON string.
*/
static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
jsmntok_t *tokens, size_t num_tokens) {
jsmntok_t *token;
int start = parser->pos;
parser->pos++;
/* Skip starting quote */
for (; js[parser->pos] != '\0'; parser->pos++) {
char c = js[parser->pos];
/* Quote: end of string */
if (c == '\"') {
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL) {
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
#ifdef JSMN_PARENT_LINKS
token->parent = parser->toksuper;
#endif
return JSMN_SUCCESS;
}
/* Backslash: Quoted symbol expected */
if (c == '\\') {
parser->pos++;
switch (js[parser->pos]) {
/* Allowed escaped symbols */
case '\"': case '/' : case '\\' : case 'b' :
case 'f' : case 'r' : case 'n' : case 't' :
break;
/* Allows escaped symbol \uXXXX */
case 'u':
parser->pos++;
int i = 0;
for(; i < 4 && 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 JSMN_ERROR_INVAL;
}
parser->pos++;
}
parser->pos--;
break;
/* Unexpected symbol */
default:
parser->pos = start;
return JSMN_ERROR_INVAL;
}
}
}
parser->pos = start;
return JSMN_ERROR_PART;
}
/**
* Fills next available token with JSON primitive.
*/
static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
jsmntok_t *tokens, size_t num_tokens)
{
jsmntok_t *token;
int start;
start = parser->pos;
for (; js[parser->pos] != '\0'; parser->pos++)
{
switch (js[parser->pos])
{
case ':':
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 JSMN_ERROR_INVAL;
}
}
found:
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL)
{
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
parser->pos--;
return JSMN_SUCCESS;
}
/**
* Fills next available token with JSON primitive.
*/
static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
size_t len, jsmntok_t *tokens, size_t num_tokens) {
jsmntok_t *token;
int start;
start = parser->pos;
for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
switch (js[parser->pos]) {
#ifndef JSMN_STRICT
/* In strict mode primitive must be followed by "," or "}" or "]" */
case ':':
#endif
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 JSMN_ERROR_INVAL;
}
}
#ifdef JSMN_STRICT
/* In strict mode primitive must be followed by a comma/object/array */
parser->pos = start;
return JSMN_ERROR_PART;
#endif
found:
if (tokens == NULL) {
parser->pos--;
return 0;
}
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL) {
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
#ifdef JSMN_PARENT_LINKS
token->parent = parser->toksuper;
#endif
parser->pos--;
return 0;
}
/**
* Filsl next token with JSON string.
*/
static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
jsmntok_t *tokens, int num_tokens) {
jsmntok_t *token;
int start = parser->pos;
parser->pos++;
/* Skip starting quote */
for (; js[parser->pos] != '\0'; parser->pos++) {
char c = js[parser->pos];
/* Quote: end of string */
if (c == '\"') {
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL) {
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
#ifdef JSMN_PARENT_LINKS
token->parent = parser->toksuper;
#endif
return JSMN_SUCCESS;
}
/* Backslash: Quoted symbol expected */
if (c == '\\') {
parser->pos++;
switch (js[parser->pos]) {
/* Allowed escaped symbols */
case '\"': case '/' : case '\\' : case 'b' :
case 'f' : case 'r' : case 'n' : case 't' :
break;
/* Allows escaped symbol \uXXXX */
case 'u':
// \u not supported
break;
/* Unexpected symbol */
default:
parser->pos = start;
return JSMN_ERROR_INVAL;
}
}
}
parser->pos = start;
return JSMN_ERROR_PART;
}
/**
* Parse JSON string and fill tokens.
*/
jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, jsmntok_t *tokens,
unsigned int num_tokens) {
int r;
int i;
jsmntok_t *token;
/* initialize the rest of tokens (they could be reallocated) */
for (i = parser->toknext; i < num_tokens; i++) {
jsmn_fill_token(&tokens[i], JSMN_PRIMITIVE, -1, -1);
}
for (; js[parser->pos] != '\0'; parser->pos++) {
char c;
jsmntype_t type;
c = js[parser->pos];
switch (c) {
case '{': case '[':
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL)
return JSMN_ERROR_NOMEM;
if (parser->toksuper != -1)
tokens[parser->toksuper].size++;
token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
token->start = parser->pos;
parser->toksuper = parser->toknext - 1;
break;
case '}': case ']':
type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
for (i = parser->toknext - 1; i >= 0; i--) {
token = &tokens[i];
if (token->start != -1 && token->end == -1) {
if (token->type != type) {
return JSMN_ERROR_INVAL;
}
parser->toksuper = -1;
token->end = parser->pos + 1;
break;
}
}
/* Error if unmatched closing bracket */
if (i == -1) return JSMN_ERROR_INVAL;
for (; i >= 0; i--) {
token = &tokens[i];
if (token->start != -1 && token->end == -1) {
parser->toksuper = i;
break;
}
}
break;
case '\"':
r = jsmn_parse_string(parser, js, tokens, num_tokens);
if (r < 0) return jsmnerr_t(r);
if (parser->toksuper != -1)
tokens[parser->toksuper].size++;
break;
case '\t' : case '\r' : case '\n' : case ':' : case ',': case ' ':
break;
#ifdef JSMN_STRICT
/* In strict mode primitives are: numbers and booleans */
case '-': case '0': case '1' : case '2': case '3' : case '4':
case '5': case '6': case '7' : case '8': case '9':
case 't': case 'f': case 'n' :
#else
/* In non-strict mode every unquoted value is a primitive */
default:
#endif
r = jsmn_parse_primitive(parser, js, tokens, num_tokens);
if (r < 0) return jsmnerr_t(r);
if (parser->toksuper != -1)
tokens[parser->toksuper].size++;
break;
#ifdef JSMN_STRICT
/* Unexpected char in strict mode */
default:
return JSMN_ERROR_INVAL;
#endif
}
}
for (i = parser->toknext - 1; i >= 0; i--) {
/* Unmatched opened object or array */
if (tokens[i].start != -1 && tokens[i].end == -1) {
return JSMN_ERROR_PART;
}
}
return JSMN_SUCCESS;
}
static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
jsmntok_t *tokens, size_t num_tokens)
#endif
{
jsmntok_t *token;
int start = parser->pos; //记录头位置
parser->pos++; //越过"
/* Skip starting quote */
#ifdef JSMN_OPTIMIZE
for (; js[parser->pos] != '\0'&& parser->pos < js_len ; parser->pos++) //直到尾部
#else
for (; js[parser->pos] != '\0'; parser->pos++)
#endif
{
char c = js[parser->pos];
/* Quote: end of string */
if (c == '\"') { //定位到尾部
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL) {
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
#ifdef JSMN_PARENT_LINKS
token->parent = parser->toksuper;
#endif
return JSMN_SUCCESS;
}
/* Backslash: Quoted symbol expected */
if (c == '\\') {
parser->pos++; //简单越过
switch (js[parser->pos]) {
/* Allowed escaped symbols */
case '\"': case '/' : case '\\' : case 'b' :
case 'f' : case 'r' : case 'n' : case 't' :
break;
/* Allows escaped symbol \uXXXX */
case 'u':
/* TODO */
break;
/* Unexpected symbol */
default:
parser->pos = start;
return JSMN_ERROR_INVAL;
}
}
}
parser->pos = start;
return JSMN_ERROR_PART;
}
/**
* Fills next available token with JSON primitive.
*/
static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
size_t len, jsmntok_t *tokens, size_t num_tokens) {
jsmntok_t *token;
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 JSMN_ERROR_INVAL;
}
}
if ( (parser->pos < len) && (js[parser->pos] != '\0') ) {
/* In strict mode primitive must be followed by a comma/object/array or end-of-string */
parser->pos = start;
return JSMN_ERROR_PART;
}
found:
token = jsmn_alloc_token(parser, tokens, num_tokens);
if (token == NULL) {
parser->pos = start;
return JSMN_ERROR_NOMEM;
}
jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
token->parent = parser->toksuper;
/* parse/validate primitives according */
do {
if (js[start] == 't') {
if ( (token->end - start == 4) && (js[start+1] == 'r') && (js[start+2] == 'u') && (js[start+3] == 'e') ) {
break;
}
} else if (js[start] == 'f') {
if ( (token->end - start == 5) && (js[start+1] == 'a') && (js[start+2] == 'l') && (js[start+3] == 's') && (js[start+4] == 'e') ) {
break;
}
} else if (js[start] == 'n') {
if ( (token->end - start == 4) && (js[start+1] == 'u') && (js[start+2] == 'l') && (js[start+3] == 'l') ) {
break;
}
} else {
if (jsmn_parse_primitive_number(js, token) == 0) {
break;
}
}
/* primitive validation failed */
parser->pos = token->start;
return JSMN_ERROR_PRIMITIVE_INVAL;
} while (0);
parser->pos--;
return 0;
}