W.alk(Xml) Haxe utility for XML.

wvxvw · Mon Jan 11, 2010 4:27 pm

Hi all.
This is my first serious experience with HaXe, however, I think many would find this thing useful. It's a pain to port oneself from AS3 with E4X to HaXe where working with XML is good comparing to JavaScript and maybe PHP, but E4X beats the living crap out of any other XML library that I know... so, neither HaXe Fast not Xml can be as simple and easy to come up with as E4X.
I've tried to write something that could simplify if not replace AS3 E4X with some HaXe code... The work is still in the process, but I shall improve.
So far the core features are like this:
You can run long queries on XML object which include customizable filtration.
The queries are made in one operation, although they have execution order.
If you're familiar with the concept of Mock Object and State Machine, then it'll be easy to understand how things work. The syntax is somewhat similar to JQuery, however, the mechanics behind the stage are rather different.

Here's an example usage:

Code:

/**
 * ...
 * @author wvxvw
 */
package org.wvxvws;

import flash.Lib;
import flash.display.Sprite;
import org.wvxvws.xml.W;

class TestW extends Sprite
{
   private var _xml:Xml;
   
   public function new() 
   {
      super();
      this._xml = Xml.parse("
      <a>
         <b/>
         <b/>
         <b>
            <c foo=\"bar0\">
               <d abcd=\"123\" qwerty=\"shouldn't catch\"/>
            </c>
            <c foo=\"bar1\"/>
            <c foo=\"bar2\">
               <d abcd=\"456\" qwerty=\"678\"/>
            </c>
            <c foo=\"bar3\"/>
         </b>
         <b/>
      </a>");
      
      // AS3 analogue: this._xml..*.(valueOf().@*.(toXMlString() == "bar2").length()).*.@qwerty;
      
      var a:Array<Hash<String>> = cast W.alk(this._xml).d().a(this.filter).c().a(this.filter2).z();
      
      trace(a); // TestW.hx 36: [{qwerty=>678}]
   }
   
   private inline function filter(attName:String, attValue:String, node:Xml):Bool
   {
      return attValue == "bar2";
   }
   
   private inline function filter2(attName:String, attValue:String, node:Xml):Bool
   {
      return attName == "qwerty";
   }
   
   public static function main() { Lib.current.addChild(new TestW()); }
}

The utility itself is here:
http://code.google.com/p/e4xu/source/br ... s/xml/W.hx

Your comments / ideas welcome

W.alk(Xml) Haxe utility for XML.

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