run.bsh

用java 编写的源码开放的文本编辑器。有很多有用的特性

/**
	Run a command in its own in its own private global namespace and interpeter
	context.  (kind of like the unix "chroot" for the namespace)
	The root bsh system object is extended (with the extend() command) and 
	made visible here, so that system info is effectively inherited.
	Because the root bsh object is extended it is effectively read / copy
	on write...  e.g. you can change directories in the child context, do
	imports, etc. and it will not affect the calling context.
	<p>

	run() is like source() except that it runs the command in a new, 
	subordinate and prune()'d namespace.  So it's like "running" a command 
	instead of "sourcing" it.  Returns the object context in which the command
	was run.
	<p>

	Returns the context so that you can gather results.
	<p>
	Paramameter runArgument an argument passed to the child context under the
		name runArgument.  e.g. you might pass in the calling This context
		from which to draw variables, etc.
	<p>

	@return Returns the context so that you can gather results.
	@param runArgument an argument passed to the child context under the
		name runArgument.  e.g. you might pass in the calling This context
		from which to draw variables, etc.
*/

bsh.help.run= "usage: Thread run( filename )";

run( String filename, Object runArgument ) 
{
	// Our local namespace is going to be the new root (global)
	// make local copies of the system stuff.
	//
	// Extend the root system object
	// this is problematic...  probably need more here...
	bsh=extend(global.bsh); 
	bsh.help=extend(bsh.help);

	// cut us off... make us the root (global) namespace for this command
	this.namespace.prune();
	this.interpreter.source( filename, this.namespace );
	return this;
}

run( String filename ) {
	run( filename, null );
}