On Wednesday 13 May 2015 10:59 AM, A. Sundararajan wrote:
Hi,
You can debug "eval"-ed code in NetBeans.
Steps:
1) put a breakpoint on the ScriptEngine.eval() call
2) do "step into" (F7) - goes into JDK's javax.script.* internal code
3) do another "step into" (F7 again) - you're right at the start of
your eval'ed JS code!
4) you can now put breakpoints on that 'eval' code JS window
[eval_window.png]
See also:
https://blogs.oracle.com/geertjan/entry/youtube_debugger_for_jdk8_s
Hope this helps,
-Sundar
On Tuesday 12 May 2015 11:36 PM, BURRIS Thomas wrote:
As usual, I have a much higher-level question than usually appears on
this list! Please direct me elsewhere if there's a more appropriate
forum....
As far as I can tell, in order to use Netbeans JS debugger with JS
code that uses Nashorn I have to use "load" in the eval of my JS.
Load apparently does something to preserve the distinct lines in the
JS, which enables the setting of breakpoints, etc. Simply using
engine.eval(string-of-code) or engine.eval(Reader) means you can't
use the debugger.
However, I am writing a platform on which I enable developers to
write their JS code and, like for node.js, etc., I wrap their code
invisibly to make it into a module. That is, I add something along
the lines of
(function() { var exports = {}; <<<< this
<user's code>
})(); <<<< and this
to "modularize" the user's code. So if I want to both "wrap" my
user's code and enable them to use the Netbeans debugger, I'm stuck
because I either a) read the JS from its file as a string, wrap it,
and then load it; or b) load it as a file (in which case I don't get
the chance to "wrap" it). Here are the two cases:
a)
String code =
getMyJavascriptAsAString("c/somedir/some.js");
code = wrapMyJsCode(code);
engine.eval("load({ script: '" + code + "', name: \"some.js\"})");
ERROR: Problem loading: somedir/some.js':
javax.script.ScriptException: <eval>:1:55 Missing close quote
load({ script: 'var x = {};
^ in <eval> at line number 1 at column
number 13
FAILS because the JS code consists of multiple lines and java doesn't
support multi-line strings.
b)
Loading from a file directly
engine.eval("load('c:/somedir/some.js');");
which works in a debugger, but doesn't enable me to "wrap" user's code.
Aside from writing out temporary files, does somebody have a better
suggestion? Is it possible to intercept the handling of
"load(<filePath>)" so that I can inject stuff into the user's code to
"modularize" it?
I hope I'm clear.
thanks
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