duktape/api-testcases/test-logging.c

/*===
*** test_1 (duk_safe_call)
TIMESTAMP TRC C: trace: 123
TIMESTAMP DBG C: debug: 123
TIMESTAMP INF C: info: 123
TIMESTAMP WRN C: warn: 123
TIMESTAMP ERR C: error: 123
TIMESTAMP FTL C: fatal: 123
TIMESTAMP TRC C: clamped trace: 123
TIMESTAMP TRC C: clamped trace: 123
TIMESTAMP FTL C: clamped fatal: 123
TIMESTAMP FTL C: clamped fatal: 123
==> rc=0, result='undefined'
===*/

int test_1(duk_context *ctx) {
	/* Force log level to output all logs. */
	duk_eval_string(ctx, "Duktape.Logger.clog.l = 0;");
	duk_pop(ctx);

	/* Replace raw() function so that we log to stdout, and replace timestamp
	 * with a fixed string to be able to build an expect string.
	 */
	duk_eval_string(ctx, "Duktape.Logger.prototype.raw = function (msg) {\n"
	                     "    msg = String(msg);  // arg is a buffer\n"
	                     "    msg = msg.replace(/\\S+/, 'TIMESTAMP')\n"
	                     "    print(msg);\n"
	                     "}");
	duk_pop(ctx);

	duk_log(ctx, DUK_LOG_TRACE, "trace: %d", 123);
	duk_log(ctx, DUK_LOG_DEBUG, "debug: %d", 123);
	duk_log(ctx, DUK_LOG_INFO, "info: %d", 123);
	duk_log(ctx, DUK_LOG_WARN, "warn: %d", 123);
	duk_log(ctx, DUK_LOG_ERROR, "error: %d", 123);
	duk_log(ctx, DUK_LOG_FATAL, "fatal: %d", 123);

	/* Invalid negative log level is clamped to 0 == DUK_LOG_TRACE */
	duk_log(ctx, -1, "clamped trace: %d", 123);
	duk_log(ctx, -123, "clamped trace: %d", 123);

	/* Too large positive log level is clamped to 5 == DUK_LOG_FATAL */
	duk_log(ctx, 6, "clamped fatal: %d", 123);
	duk_log(ctx, 123, "clamped fatal: %d", 123);

	return 0;
}

void test(duk_context *ctx) {
	TEST_SAFE_CALL(test_1);
}