extend.bsh

用java 编写的源码开放的文本编辑器。有很多有用的特性

/**
	Return a new object that is a child of the specified object.
	<strong>
	Note: this command will likely change along with a better inheritance 
	mechanism for bsh in a future release.</strong>
	<p>

	extend() is like the object() command, which
	creates a new bsh scripted object, except that the namespace of
	the new object is a child of the parent object. 
	<p>

	For example:
	<p>

	<pre>

		foo=object();
		bar=extend(foo);

	is equivalent to:
	  
		foo() { 
			bar() {
				return this; 
			}
		}

		foo=foo();
		bar=foo.bar();

	and also:
	 
	   foo=object();
	   bar=object();
	   bar.namespace.bind( foo.namespace );
	</pre>
	<p>

	The last example above is exactly what the extend() command does.
	In each case the bar object inherits variables from foo in the usual way.

	@method This extend( This object )
*/
bsh.help.extend= "usage: extend( This parent )";
extend( bsh.This parent ) { 
	this.namespace.setParent( parent.namespace );
	return this; 
}