notes on XML wh0 forked:1favorite:2lines:38license : MIT License modified : 2011-07-03 09:47:14 Embed Tweet package { import com.actionscriptbible.Example; public class FlashTest extends Example { public function FlashTest() { // these little empty tags make an XMLList, not an XML object. var list:XMLList = <></>; trace(list.length()); // you can populate XMLList like an array list[0] = <a/>; list[2] = <b/>; // it automatically squishes out any sparseness trace(list[1].toXMLString()); // <b/> // constructing XML(String) parses it instead of making a text node var foo:XML = new XML('<foo/>'); trace(foo.toXMLString()); // invalid syntax will cause an error var str:String = '1 < 2'; try { new XML(str); } catch(e:Error) { trace(e); } // then how do you create an text node from a string? // escape it... AVM2 has "esc_xelem" op, but we don't have access to that var text:XML = new XML(str.replace(/</g, '<')); trace(text); // something kludgy... var text2:XML = <>{str}</>[0]; trace(text2); // what happens when you use E4X? var e4x:XML = <span><img /></span>; // bytecode is more like: // local = new XML('<span><img /></span>'); // i.e., it's parsed at run time. trace(e4x.toXMLString()); var fancy:XML = <div>{'before' + <test/> + 'after'}</div>; // bytecode is more like: // local = new XML('<div>' + __esc_xelem('before ' + new XML('<test/>') + ' after') + '</div>'); // notice that this would implicitly call toString() on <test/>, // which would return nothing, since it is "simple" trace(fancy.toXMLString()); // nothing between before and after var fancier:XML = <div>{<test/>}</div>; trace(fancier.toXMLString()); // <div><test/></div> // note that now the argument is of type XML, which survives // what happens when you use filtering? var haystack:XMLList = <> <i f="y"/> <j f="n"/> <k f="y"/> </>; var ik:XMLList = haystack.(@f == 'y'); // bytecode is more like: // var _nodes:XMLList = haystack; // var _i:int = 0; // var _result:XMLList = new XMLList(''); // while (__hasnext2(_nodes, _i)) { // this sets _i to the next key // var _node = _nodes[_i]; // with (_node) { // if (@f == 'y') { // _result[_i] = _node; // } // } // } // ik = _result; trace(ik); } } } Code Fullscreen Preview Fullscreen xor ton_ e4x xml XML trace XMLList test toXMLString replace Error text length String sort new page view favorite forked pv86 forked from: notes on XML fujiopera forked:1 favorite:0lines:38 (diff:1)
