diff options
Diffstat (limited to 'strings')
| -rw-r--r-- | strings/json_lib.c | 94 |
1 files changed, 92 insertions, 2 deletions
diff --git a/strings/json_lib.c b/strings/json_lib.c index e28ec3ca460..6c94ce2271e 100644 --- a/strings/json_lib.c +++ b/strings/json_lib.c @@ -1943,9 +1943,10 @@ err_return: @retval JSV_NOTHING - no such key found. */ enum json_types json_get_object_key(const char *js, const char *js_end, - const char *key, const char *key_end, + const char *key, const char **value, int *value_len) { + const char *key_end= key + strlen(key); json_engine_t je; json_string_t key_name; int n_keys= 0; @@ -1999,10 +2000,99 @@ enum json_types json_get_object_nkey(const char *js,const char *js_end, int nkey @retval 0 - success, json is well-formed @retval 1 - error, json is invalid -*/int json_valid(const char *js, size_t js_len, CHARSET_INFO *cs) +*/ +int json_valid(const char *js, size_t js_len, CHARSET_INFO *cs) { json_engine_t je; json_scan_start(&je, cs, (const uchar *) js, (const uchar *) js + js_len); while (json_scan_next(&je) == 0) /* no-op */ ; return je.s.error == 0; } + + +/* + Expects the JSON object as an js argument, and the key name. + Looks for this key in the object and returns + the location of all the text related to it. + The text includes the comma, separating this key. + + comma_pos - the hint where the comma is. It is important + if you plan to replace the key rather than just cut. + 1 - comma is on the left + 2 - comma is on the right. + 0 - no comma at all (the object has just this single key) + + if no such key found *key_start is set to NULL. +*/ +int json_locate_key(const char *js, const char *js_end, + const char *kname, + const char **key_start, const char **key_end, + int *comma_pos) +{ + const char *kname_end= kname + strlen(kname); + json_engine_t je; + json_string_t key_name; + int t_next, c_len, match_result; + + json_string_set_cs(&key_name, &my_charset_utf8mb4_bin); + + json_scan_start(&je, &my_charset_utf8mb4_bin,(const uchar *) js, + (const uchar *) js_end); + + if (json_read_value(&je) || + je.value_type != JSON_VALUE_OBJECT) + goto err_return; + + *key_start= (const char *) je.s.c_str; + *comma_pos= 0; + + while (!json_scan_next(&je)) + { + switch (je.state) + { + case JST_KEY: + json_string_set_str(&key_name, (const uchar *) kname, + (const uchar *) kname_end); + match_result= json_key_matches(&je, &key_name); + if (json_skip_key(&je)) + goto err_return; + get_first_nonspace(&je.s, &t_next, &c_len); + je.s.c_str-= c_len; + + if (match_result) + { + *key_end= (const char *) je.s.c_str; + + if (*comma_pos == 1) + return 0; + + DBUG_ASSERT(*comma_pos == 0); + + if (t_next == C_COMMA) + { + *key_end+= c_len; + *comma_pos= 2; + } + else if (t_next == C_RCURB) + *comma_pos= 0; + else + goto err_return; + return 0; + } + + *key_start= (const char *) je.s.c_str; + *comma_pos= 1; + break; + + case JST_OBJ_END: + *key_start= NULL; + return 0; + } + } + +err_return: + return 1; + +} + + |