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f4318f3f3b
Move classes Json_string, and Json_saved_parser_state from opt_histogram_json.cc to the newly created file sql_json_lib.h Additionally, make the function json_unescape_to_string public earlier defined as static in opt_histogram_json.cc, by adding the declaration in sql_json_lib.h Needed this change so that, the classes and functions can be reused in other pieces of the code.
76 lines
No EOL
2 KiB
C++
76 lines
No EOL
2 KiB
C++
/*
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Copyright (c) 2025, MariaDB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335
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USA */
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#ifndef SQL_JSON_LIB
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#define SQL_JSON_LIB
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/*
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A syntax sugar interface to json_string_t
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*/
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class Json_string
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{
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json_string_t str;
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public:
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explicit Json_string(const char *name)
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{
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json_string_set_str(&str, (const uchar *) name,
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(const uchar *) name + strlen(name));
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json_string_set_cs(&str, system_charset_info);
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}
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json_string_t *get() { return &str; }
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};
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/*
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This [partially] saves the JSON parser state and then can rollback the parser
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to it.
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The goal of this is to be able to make multiple json_key_matches() calls:
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Json_saved_parser_state save(je);
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if (json_key_matches(je, KEY_NAME_1)) {
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...
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return;
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}
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save.restore_to(je);
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if (json_key_matches(je, KEY_NAME_2)) {
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...
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}
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This allows one to parse JSON objects where [optional] members come in any
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order.
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*/
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class Json_saved_parser_state
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{
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const uchar *c_str;
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my_wc_t c_next;
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int state;
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public:
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explicit Json_saved_parser_state(const json_engine_t *je)
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: c_str(je->s.c_str), c_next(je->s.c_next), state(je->state)
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{
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}
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void restore_to(json_engine_t *je)
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{
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je->s.c_str= c_str;
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je->s.c_next= c_next;
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je->state= state;
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}
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};
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/*
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@brief
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Un-escape a JSON string and save it into *out.
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*/
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bool json_unescape_to_string(const char *val, int val_len, String *out);
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#endif |