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