a question about what I can do with load()...

[A. Sundararajan]

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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