Hello again.
I'm having major problems with the JavaScript engine which comes bundled
with Java 6 (version 1.6.0_10 here). After working my way through the
rather uncomfortable API provided by the javax.script package, I found
that some of the scripts we use were producing errors in unexpected
places. I was able to pinpoint the problem to assignments like this:
var x = undefined || 0;
This assigns undefined to x, instead of 0. Other, similar assignments
are also broken (see test class below). Unfortunately, this is a very
frequently used construct. Is (or was) this a known problem, and is
there a workaround?
The engine identifies itself as "Mozilla Rhino, version 1.6 release 2".
I realize that's a very old version, and I've never had this problem
with more recent versions of the standalone Rhino package.
Thanks in advance,
Stefan
---------------------------------------------------
The test class below produces the following output (for me):
input expected actual result
false number number 0.0
undefined number undefined sun.org.j[...].undefi...@e3b895
null number number 0.0
'' number string
0 number number 0.0
-0 number number 0.0
true boolean boolean true
' ' string string
1 number boolean true
{} object object [object Object]
---------------------------------------------------
import java.util.*;
import javax.script.*;
public final class RhinoTest3 {
public static void main (String[] args) throws Exception
{
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine engine = mgr.getEngineByName("JavaScript");
Invocable inv = (Invocable) engine;
Map<String, String> tests = new LinkedHashMap<String, String>();
// input expected result type
tests.put("false", "number");
tests.put("undefined", "number");
tests.put("null", "number");
tests.put("''", "number");
tests.put("0", "number");
tests.put("-0", "number");
tests.put("true", "boolean");
tests.put("' '", "string");
tests.put("1", "number");
tests.put("{}", "object");
System.out.println("input expected actual result");
System.out.println();
for (Map.Entry test : tests.entrySet()) {
String js = "var x = " + test.getKey() + " || 0; typeof x";
String type = (String) engine.eval(js);
System.out.printf("%-10s %-10s %-10s %s%n",
test.getKey(),
test.getValue(),
type,
"" + engine.get("x"));
}
}
}
_______________________________________________
dev-tech-js-engine-rhino mailing list
[email protected]
https://lists.mozilla.org/listinfo/dev-tech-js-engine-rhino
