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Message-ID: <1802819.gFTYypYLGV@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Mon, 03 Sep 2012 21:45:37 +0200
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Subject: Re: String Processing in JavaScript
Newsgroups: comp.lang.javascript
References: <rgf248la5ap1dusauc9ek39jasff47mht4@4ax.com> <k22pe2$cmk$1@news.albasani.net>
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Stefan Weiss wrote:

> On 2012-09-01 00:56, Gene Wirchenko wrote:
>>      I will be passing back long result strings to my Web pages. These
>> strings have to be parsed into error codes and form field contents.
>> What I am working with looks like
>>           <fieldname>:<value length>:<value>\n
>> The value is encodeURIComponent()ed.
> 
> From your other posts, it appears that you're in control of both backend
> and client code. If that's the case, you may want to consider one of the
> many standardized data transfer formats.
> JSON would be the obvious choice, as it's trivially easy to use for a
> JavaScript client, and it's well supported in every major server-side
> language. Others possible choices include XML (also well supported by
> JS) […]

In contrast to built-in JSON support from ECMAScript (ECMA-262) Edition 5 
forward [0], ECMAScript and its conforming implementations have no native 
support for XML.

However, many more recent host environments provide features to support XML 
with ECMAScript binding that are standardized or in the standardization 
process, thus host objects such as DOMParser [1] and XMLSerializer [2], and 
of course XMLHttpRequest (which has a responseXML property to implement 
refer to an object implementing the Document interface if the Content-Type 
fits) [3].

There have been implementations of ECMAScript for XML (E4X, ECMA-357) in 
Mozilla, thus Mozilla-based browsers, but development of that and support of 
E4X has been discontinued there, unfortunately.  Firefox 10 and later do not 
support E4X syntax and objects in ES5 strict mode.  E4X support will likely 
be disabled by default per Firefox 17. [4]  E4X support today can still be 
found in the older Rhino 1.7 implementation, for example.  The ECMAScript 
Support Matrix [5] already contains one test case for the for-each statement 
of E4X.  As time permits, there are going to be more E4X-related test cases 
there.


PointedEars
___________
[0] <http://ecma-international.org/ecma-262/5.1/#sec-5.1.5>
[1] <https://developer.mozilla.org/en-
US/docs/DOM/DOMParser?redirectlocale=en-US&redirectslug=DOMParser>
[2] <https://developer.mozilla.org/en-US/docs/XMLSerializer>
[3] <https://developer.mozilla.org/en-
US/docs/DOM/XMLHttpRequest?redirectlocale=en-US&redirectslug=XMLHttpRequest>
[4] <http://en.wikipedia.org/wiki/E4X> pp.
[5] <http://PointedEars.de/es-matrix/>
-- 
var bugRiddenCrashPronePieceOfJunk = (
    navigator.userAgent.indexOf('MSIE 5') != -1
    && navigator.userAgent.indexOf('Mac') != -1
)  // Plone, register_function.js:16