package org.subalternproductions.seepResource.dsl.style
{
	
	import org.subalternproductions.util.collections.Hash;
	import org.subalternproductions.util.collections.IIterator;
	

	/**
	 * Manages hash & array of style, assigns (runtime) unique indies to tokens
	 */
	public class StyleMap
	{
		public function StyleMap()
		{
		}
		
		
		private var _tokens:Array = [];
		private var _styleHash:Hash = new Hash(ISStyle); 
		
		/**
		 * Adds the token (unless it alread exists) and returns the token ID 
		 */
		public function add(style:ISStyle):int {
			var name:String = style.name;
			
			if (_styleHash.getItem(name)) {
				var index:int = (_styleHash.getItem(name)  as ISStyle).index;
				// overwrite existing style
				_styleHash.addItem(name, style);
				style.index = index;
				return index; 
			}
			
			_tokens.push(style);
			_styleHash.addItem(name, style);
			style.index = _tokens.length -1
			return style.index;
		} // setToken
		
		
		public function styleByName(name:String):ISStyle {
			return _styleHash.getItem(name) as ISStyle;
		}
		
		/**
		 * Returns the token id, returning 
		 */
		public function index(name:String):int {
			return _styleHash.getItem(name)  ? (_styleHash.getItem(name) as ISStyle).index : -1;
		}
		
		public function name(index:int):String {
			return (index >= 0 && index < _tokens.length) ? (_tokens[index] as ISStyle).name : null;
		}
		
		public function style(index:int):ISStyle {
			return (index >= 0 && index < _tokens.length) ? (_tokens[index] as ISStyle) : null;
		}

		public function iterator():IIterator {
			return _styleHash.iterator();
		}
		
	} // class
} // package