datum_to_json()

static void datum_to_json ( Datum  val, bool  is_null, StringInfo  result, JsonTypeCategory  tcategory, Oid  outfuncoid, bool  key_scalar  )

static

Definition at line 330 of file lwgeom_out_geojson.c.

{
        char       *outputstr;
        text       *jsontext;
 
        check_stack_depth();
 
        /* callers are expected to ensure that null keys are not passed in */
        Assert(!(key_scalar && is_null));
 
        if (is_null)
        {
                appendStringInfoString(result, "null");
                return;
        }
 
        if (key_scalar &&
                (tcategory == JSONTYPE_ARRAY ||
                 tcategory == JSONTYPE_COMPOSITE ||
                 tcategory == JSONTYPE_JSON ||
                 tcategory == JSONTYPE_CAST))
                ereport(ERROR,
                                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                                 errmsg("key value must be scalar, not array, composite, or json")));
 
        switch (tcategory)
        {
                case JSONTYPE_ARRAY:
                        array_to_json_internal(val, result, false);
                        break;
                case JSONTYPE_COMPOSITE:
                        composite_to_json(val, result, false);
                        break;
                case JSONTYPE_BOOL:
                        outputstr = DatumGetBool(val) ? "true" : "false";
                        if (key_scalar)
                                escape_json(result, outputstr);
                        else
                                appendStringInfoString(result, outputstr);
                        break;
                case JSONTYPE_NUMERIC:
                        outputstr = OidOutputFunctionCall(outfuncoid, val);
 
                        /*
                         * Don't call escape_json for a non-key if it's a valid JSON
                         * number.
                         */
                        if (!key_scalar && IsValidJsonNumber(outputstr, strlen(outputstr)))
                                appendStringInfoString(result, outputstr);
                        else
                                escape_json(result, outputstr);
                        pfree(outputstr);
                        break;
                case JSONTYPE_DATE:
                        {
                                char            buf[MAXDATELEN + 1];
 
                                postgis_JsonEncodeDateTime(buf, val, DATEOID);
                                appendStringInfo(result, "\"%s\"", buf);
                        }
                        break;
                case JSONTYPE_TIMESTAMP:
                        {
                                char            buf[MAXDATELEN + 1];
 
                                postgis_JsonEncodeDateTime(buf, val, TIMESTAMPOID);
                                appendStringInfo(result, "\"%s\"", buf);
                        }
                        break;
                case JSONTYPE_TIMESTAMPTZ:
                        {
                                char            buf[MAXDATELEN + 1];
 
                                postgis_JsonEncodeDateTime(buf, val, TIMESTAMPTZOID);
                                appendStringInfo(result, "\"%s\"", buf);
                        }
                        break;
                case JSONTYPE_JSON:
                        /* JSON and JSONB output will already be escaped */
                        outputstr = OidOutputFunctionCall(outfuncoid, val);
                        appendStringInfoString(result, outputstr);
                        pfree(outputstr);
                        break;
                case JSONTYPE_CAST:
                        /* outfuncoid refers to a cast function, not an output function */
                        jsontext = DatumGetTextPP(OidFunctionCall1(outfuncoid, val));
                        outputstr = text_to_cstring(jsontext);
                        appendStringInfoString(result, outputstr);
                        pfree(outputstr);
                        pfree(jsontext);
                        break;
                default:
                        outputstr = OidOutputFunctionCall(outfuncoid, val);
                        escape_json(result, outputstr);
                        pfree(outputstr);
                        break;
        }
}

References array_to_json_internal(), composite_to_json(), JSONTYPE_ARRAY, JSONTYPE_BOOL, JSONTYPE_CAST, JSONTYPE_COMPOSITE, JSONTYPE_DATE, JSONTYPE_JSON, JSONTYPE_NUMERIC, JSONTYPE_TIMESTAMP, JSONTYPE_TIMESTAMPTZ, postgis_JsonEncodeDateTime(), and text_to_cstring().

Referenced by array_dim_to_json(), composite_to_geojson(), and composite_to_json().

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