jsonfuncs.h

Go to the documentation of this file.

/*-------------------------------------------------------------------------
 *
 * jsonfuncs.h
 *    Functions to process JSON data types.
 *
 * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/jsonfuncs.h
 *
 *-------------------------------------------------------------------------
 */
 
#ifndef JSONFUNCS_H
#define JSONFUNCS_H
 
#include "common/jsonapi.h"
#include "utils/jsonb.h"
 
/*
 * Flag types for iterate_json(b)_values to specify what elements from a
 * json(b) document we want to iterate.
 */
typedef enum JsonToIndex
{
    jtiKey = 0x01,
    jtiString = 0x02,
    jtiNumeric = 0x04,
    jtiBool = 0x08,
    jtiAll = jtiKey | jtiString | jtiNumeric | jtiBool
} JsonToIndex;
 
/* an action that will be applied to each value in iterate_json(b)_values functions */
typedef void (*JsonIterateStringValuesAction) (void *state, char *elem_value, int elem_len);
 
/* an action that will be applied to each value in transform_json(b)_values functions */
typedef text *(*JsonTransformStringValuesAction) (void *state, char *elem_value, int elem_len);
 
/* build a JsonLexContext from a text datum */
extern JsonLexContext *makeJsonLexContext(text *json, bool need_escapes);
 
/* try to parse json, and ereport(ERROR) on failure */
extern void pg_parse_json_or_ereport(JsonLexContext *lex, JsonSemAction *sem);
 
/* report an error during json lexing or parsing */
extern void json_ereport_error(JsonParseErrorType error, JsonLexContext *lex);
 
/* get first JSON token */
extern JsonTokenType json_get_first_token(text *json, bool throw_error);
 
extern uint32 parse_jsonb_index_flags(Jsonb *jb);
extern void iterate_jsonb_values(Jsonb *jb, uint32 flags, void *state,
                                 JsonIterateStringValuesAction action);
extern void iterate_json_values(text *json, uint32 flags, void *action_state,
                                JsonIterateStringValuesAction action);
extern Jsonb *transform_jsonb_string_values(Jsonb *jsonb, void *action_state,
                                            JsonTransformStringValuesAction transform_action);
extern text *transform_json_string_values(text *json, void *action_state,
                                          JsonTransformStringValuesAction transform_action);
 
extern Datum json_populate_type(Datum json_val, Oid json_type,
                                Oid typid, int32 typmod,
                                void **cache, MemoryContext mcxt, bool *isnull);
 
#endif