Subj : Re: SM: run a script from a native function
To   : netscape.public.mozilla.jseng
From : Shanti Rao <shantirao@yahoo.com>
Date : Fri Jan 09 2004 03:13 pm

Brendan Eich wrote:
> Shanti Rao wrote:
> [. . .]
> 
>> js_ReportIsNotDefined() gets called back from js_Interpret. 
>> InitExecptionObject() gets called as before, and makes a 
>> ReferenceError exception with the right file name and line number. The 
>> pending exception then has the messgae "asdf is not defined", just as 
>> before. This time, however, when control returns to 
>> EvaluateUCScriptFP(), cx->fp is null,
> 
> 
> You mean "not null" here.

Sorry, you're right. My problem is that, although there's a pending exception, 
the interpreter never acts on it. Here's what one needs to do to make a proper 
run() native function:

JSBool RunScript(JSContext*cx, JSObject*obj, uintN argc, jsval *argv, jsval *rval)
{
  *rval = OBJECT_TO_JSVAL(0);

  if (argc < 1) return JS_TRUE;

  //open the script

  if (JS_BufferIsCompilableUnit(cx,global,text,text.size())
  {
   if (!JS_EvaluateScript(cx,global,text,text.size(),filename,line,&rval))
     return JS_FALSE;
  }
  return JS_TRUE;
}

My mistake was in not returning JS_FALSE if JS_EvaluateScript didn't return 
false. Thanks for your help!

Shanti

.