Hi,
Sorry for the delayed response (was on vacation). "eval naming" (//@
sourceURL or //# sourceURL) support has been added in jdk9 and
backported to jdk8u-dev repo (most likely will be in 8u20).
import javax.script.*;
public class Main {
public static void main(String[] args) throws Exception {
ScriptEngineManager m = new ScriptEngineManager();
ScriptEngine e = m.getEngineByName("nashorn");
Compilable c = (Compilable)e;
CompiledScript cs = c.compile("throw new Error();\n//#
sourceURL=myfile.js");
cs.eval();
}
}
When you run the above code, you'll see myfile.js as source file name
for that script frame throwing error.
Not just CompiledScript.eval - any eval - including engine.eval and
script 'eval' function accept this // #sourceURL comment and use that
value as name for the script "file". See also:
https://bugs.openjdk.java.net/browse/JDK-8032068
-Sundar
On Tuesday 22 April 2014 01:17 PM, Benjamin Sieffert wrote:
Hi Greg,
I've also tried to do this, but (without looking into it very extensively)
didn't find a way other than to build a second string that wraps the first
one like this:
String scriptWithFileName = "load("
// will be shown as scriptname in stacktraces
+ "{ name: \"" + name + '"' + ','
// the actual script
+ "script:" + escapeJavaScript(script) + '"'
+ '}'
+ ')';
It's working as intended and doesn't seem to have any unwanted
side-effects, but of course it would be nice to be able to do this more
cleanly from Java. I guess there's the possibility of calling the
load-extension somewhere, but it doesn't seem to be public (Java) API.
Hope this helps
2014-04-21 22:02 GMT+02:00 Greg Brail <[email protected]>:
Let's say that I have some JS code like this:
(function(foo) {
throw new Error('Sorry, ' + foo);
})
and I execute it by reading it into a String variable, then executing it
using ScriptEngine.eval(string), and then I call the function later, either
from Java directly or from some other JS code.
Right now, in Nashorn, I see that the stack trace of my exception will
include the entry:
"<eval>:2"
to indicate the "file name" and line number of my error.
I would like instead to stick in a file name so that the file name appears
instead of "<eval>". Is there a way for me to do that?
I did try setting the property "ScriptEngine.FILENAME" on my script
context, but that seems to be a global context. It works the first time I
run the script, but if I call the function later on from inside another
script, the file name doesn't "stick" to the code.
I can provide an example if I need to, but is there anything you guys can
think of that I can do in order to get a file name to stick to this
function for the purpose of stack traces?
--
*greg brail* | *apigee <https://apigee.com/>* | twitter
@gbrail<http://twitter.com/gbrail>
