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Add new JSON processing functions and parser API.

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The JSON parser is converted into a recursive descent parser, and
exposed for use by other modules such as extensions. The API provides
hooks for all the significant parser event such as the beginning and end
of objects and arrays, and providing functions to handle these hooks
allows for fairly simple construction of a wide variety of JSON
processing functions. A set of new basic processing functions and
operators is also added, which use this API, including operations to
extract array elements, object fields, get the length of arrays and the
set of keys of a field, deconstruct an object into a set of key/value
pairs, and create records from JSON objects and arrays of objects.

Catalog version bumped.

Andrew Dunstan, with some documentation assistance from Merlin Moncure.
This commit is contained in:
Andrew Dunstan
2013-03-29 14:12:13 -04:00
parent 9ad27c2153
commit a570c98d7f
12 changed files with 3580 additions and 311 deletions
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16
src/include/utils/json.h
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@ -17,6 +17,7 @@
#include "fmgr.h"
#include "lib/stringinfo.h"
/* functions in json.c */
extern Datum json_in(PG_FUNCTION_ARGS);
extern Datum json_out(PG_FUNCTION_ARGS);
extern Datum json_recv(PG_FUNCTION_ARGS);
@ -32,4 +33,19 @@ extern Datum json_agg_finalfn(PG_FUNCTION_ARGS);
extern void escape_json(StringInfo buf, const char *str);
/* functions in jsonfuncs.c */
extern Datum json_object_field(PG_FUNCTION_ARGS);
extern Datum json_object_field_text(PG_FUNCTION_ARGS);
extern Datum json_array_element(PG_FUNCTION_ARGS);
extern Datum json_array_element_text(PG_FUNCTION_ARGS);
extern Datum json_extract_path(PG_FUNCTION_ARGS);
extern Datum json_extract_path_text(PG_FUNCTION_ARGS);
extern Datum json_object_keys(PG_FUNCTION_ARGS);
extern Datum json_array_length(PG_FUNCTION_ARGS);
extern Datum json_each(PG_FUNCTION_ARGS);
extern Datum json_each_text(PG_FUNCTION_ARGS);
extern Datum json_array_elements(PG_FUNCTION_ARGS);
extern Datum json_populate_record(PG_FUNCTION_ARGS);
extern Datum json_populate_recordset(PG_FUNCTION_ARGS);
#endif /* JSON_H */