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Message-ID: <1367331.WGnKmheAe9@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Wed, 28 Dec 2011 19:10:19 +0100
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Subject: Re: Simulate goto
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John G Harris wrote:

> Thomas 'PointedEars' Lahn wrote:
>> Tom de Neef wrote:
>>> The error may have more to do with 'continue' than with the label.
>>> Check where you can use a continue statement - I think it is restricted
>>> to for- and while- loops.
>> You are mistaken.  The `continue' statement, like the Labelled Statement
>> is just another /Statement/, and it can be located anywhere in a
>> /Program/:
> 
> Now look at section 12.7 of ECMAScript 262, 5.1 Edition, at the text
> following
>    "A program is considered syntactically incorrect if either of
>     the following is true:"
> which disagrees with you.

No, but it disagrees with the implications of my statement regarding this 
problem.  A `continue' statement *can* be located anywhere in a /Program/.  
However, there are restrictions as to location of the label that may be 
referred by the optional /Identifier/.

AIUI, it should be possible to use an enclosing /Statement/ (like a /Block/ 
statement) and a `break' statement here (section 12.8):

  function testGoto()
  {
    var isFirst = true;
    if (true)
    {
skipPoint:
      window.alert("Using goto\n");
 
      if (isFirst)
      {
        isFirst = false;
        break skipPoint;
        window.alert("This part is skipped");
      }
    }
  }

However, Google V8 3.5.10.9+ in Chromium 15.0.874.121 (Developer Build 
109964 Linux) considers that a syntax error as well (same error message: 
"SyntaxError: Undefined label 'skipPoint'").  Is this a bug?


PointedEars
-- 
When all you know is jQuery, every problem looks $(olvable).