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/*-------------------------------------------------------------------------
*
* json.h
* Declarations for JSON data type support.
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/json.h
*
*-------------------------------------------------------------------------
*/
#ifndef JSON_H
#define JSON_H
#include "lib/stringinfo.h"
typedef enum /* type categories for datum_to_json */
{
JSONTYPE_NULL, /* null, so we didn't bother to identify */
JSONTYPE_BOOL, /* boolean (built-in types only) */
JSONTYPE_NUMERIC, /* numeric (ditto) */
JSONTYPE_DATE, /* we use special formatting for datetimes */
JSONTYPE_TIMESTAMP,
JSONTYPE_TIMESTAMPTZ,
JSONTYPE_JSON, /* JSON itself (and JSONB) */
JSONTYPE_ARRAY, /* array */
JSONTYPE_COMPOSITE, /* composite */
JSONTYPE_CAST, /* something with an explicit cast to JSON */
JSONTYPE_OTHER /* all else */
} JsonTypeCategory;
/* functions in json.c */
extern void escape_json(StringInfo buf, const char *str);
extern char *JsonEncodeDateTime(char *buf, Datum value, Oid typid,
const int *tzp);
extern bool to_json_is_immutable(Oid typoid);
extern void json_categorize_type(Oid typoid, JsonTypeCategory *tcategory,
Oid *outfuncoid);
extern Datum to_json_worker(Datum val, JsonTypeCategory tcategory,
Oid outfuncoid);
extern Datum json_build_object_worker(int nargs, Datum *args, bool *nulls,
Oid *types, bool absent_on_null,
bool unique_keys);
extern Datum json_build_array_worker(int nargs, Datum *args, bool *nulls,
Oid *types, bool absent_on_null);
extern bool json_validate(text *json, bool check_unique_keys, bool throw_error);
#endif /* JSON_H */
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