/*
* Turn a scalar Datum into JSON, appending the string to "result".
*
* Hand off a non-scalar datum to composite_to_json or array_to_json_internal
* as appropriate.
*/
static void
datum_to_json(Datum val, bool is_null, StringInfo result,
TYPCATEGORY tcategory, Oid typoutputfunc)
{
char *outputstr;
if (is_null)
{
appendStringInfoString(result, "null");
return;
}
switch (tcategory)
{
case TYPCATEGORY_ARRAY:
array_to_json_internal(val, result, false);
break;
case TYPCATEGORY_COMPOSITE:
composite_to_json(val, result, false);
break;
case TYPCATEGORY_BOOLEAN:
if (DatumGetBool(val))
appendStringInfoString(result, "true");
else
appendStringInfoString(result, "false");
break;
case TYPCATEGORY_NUMERIC:
outputstr = OidOutputFunctionCall(typoutputfunc, val);
/*
* Don't call escape_json here if it's a valid JSON number.
* Numeric output should usually be a valid JSON number and JSON
* numbers shouldn't be quoted. Quote cases like "Nan" and
* "Infinity", however.
*/
if (strpbrk(outputstr, NON_NUMERIC_LETTER) == NULL)
appendStringInfoString(result, outputstr);
else
escape_json(result, outputstr);
pfree(outputstr);
break;
case TYPCATEGORY_JSON:
/* JSON will already be escaped */
outputstr = OidOutputFunctionCall(typoutputfunc, val);
appendStringInfoString(result, outputstr);
pfree(outputstr);
break;
default:
outputstr = OidOutputFunctionCall(typoutputfunc, val);
escape_json(result, outputstr);
pfree(outputstr);
break;
}
}
/*
* SQL function array_to_json(row)
*/
extern Datum
array_to_json(PG_FUNCTION_ARGS)
{
Datum array = PG_GETARG_DATUM(0);
StringInfo result;
result = makeStringInfo();
array_to_json_internal(array, result, false);
PG_RETURN_TEXT_P(cstring_to_text(result->data));
};
/*
* SQL function array_to_json(row, prettybool)
*/
extern Datum
array_to_json_pretty(PG_FUNCTION_ARGS)
{
Datum array = PG_GETARG_DATUM(0);
bool use_line_feeds = PG_GETARG_BOOL(1);
StringInfo result;
result = makeStringInfo();
array_to_json_internal(array, result, use_line_feeds);
PG_RETURN_TEXT_P(cstring_to_text(result->data));
};
/*
* Turn a scalar Datum into JSON. Hand off a non-scalar datum to
* composite_to_json or array_to_json_internal as appropriate.
*/
static inline void
datum_to_json(Datum val, StringInfo result, TYPCATEGORY tcategory,
Oid typoutputfunc)
{
char *outputstr;
if (val == (Datum) NULL)
{
appendStringInfoString(result,"null");
return;
}
switch (tcategory)
{
case TYPCATEGORY_ARRAY:
array_to_json_internal(val, result, false);
break;
case TYPCATEGORY_COMPOSITE:
composite_to_json(val, result, false);
break;
case TYPCATEGORY_BOOLEAN:
if (DatumGetBool(val))
appendStringInfoString(result,"true");
else
appendStringInfoString(result,"false");
break;
case TYPCATEGORY_NUMERIC:
outputstr = OidOutputFunctionCall(typoutputfunc, val);
/*
* Don't call escape_json here. Numeric output should
* be a valid JSON number and JSON numbers shouldn't
* be quoted.
*/
appendStringInfoString(result, outputstr);
pfree(outputstr);
break;
default:
outputstr = OidOutputFunctionCall(typoutputfunc, val);
escape_json(result, outputstr);
pfree(outputstr);
}
}