Sprite.java

/**
 * Copyright (c) 2014, the Railo Company Ltd.
 * Copyright (c) 2015, Lucee Assosication Switzerland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package lucee.transformer.cfml.evaluator.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import lucee.commons.digest.HashUtil;
import lucee.commons.lang.ExceptionUtil;
import lucee.commons.lang.IDGenerator;
import lucee.runtime.exp.PageRuntimeException;
import lucee.runtime.op.Caster;
import lucee.transformer.bytecode.Page;
import lucee.transformer.bytecode.statement.tag.Attribute;
import lucee.transformer.bytecode.statement.tag.Tag;
import lucee.transformer.bytecode.util.ASMUtil;
import lucee.transformer.cfml.evaluator.EvaluatorException;
import lucee.transformer.cfml.evaluator.EvaluatorSupport;
import lucee.transformer.expression.Expression;
import lucee.transformer.library.function.FunctionLib;
import lucee.transformer.library.tag.TagLibTag;
import lucee.transformer.util.SourceCode;


public final class Sprite extends EvaluatorSupport {
	
	//private static final Expression DELIMITER = LitString.toExprString(",");
	private static Map<String,Previous> sprites=new HashMap<String,Previous>(); 
	
	@Override
	public void evaluate(Tag tag,TagLibTag tagLibTag,FunctionLib[] flibs) throws EvaluatorException {
        String id="sprite_"+IDGenerator.intId();
        try {
			Page page = ASMUtil.getAncestorPage(tag);
			
			SourceCode sc = page.getSourceCode();
			
			String key=sc.id();
			key=HashUtil.create64BitHashAsString(Thread.currentThread().getId()+":"+key);
			
			
			
			Expression src = tag.getAttribute("src").getValue();
			
			
			// get data from previous sprites
			Previous previous = sprites.get(key);
			if(previous!=null) {
				previous.tag.removeAttribute("_ids");
				previous.tag.removeAttribute("_srcs");
				previous.tag=tag;
			}
			else {
				sprites.put(key, previous = new Previous(tag));
			}
			
			previous.ids.add(id);
			if(previous.src==null)previous.src=src;
			else {
				previous.src=tag.getFactory().opString(previous.src,tag.getFactory().createLitString(","));
				previous.src=tag.getFactory().opString(previous.src,src);
			}
			
			
			
			tag.addAttribute(
					new Attribute(
							false,
							"_id",
							tag.getFactory().createLitString(id),
							"string"
					));
			tag.addAttribute(
					new Attribute(
							false,
							"_ids",
							tag.getFactory().createLitString(lucee.runtime.type.util.ListUtil.listToList(previous.ids, ",")),
							"string"
					));

			tag.addAttribute(
					new Attribute(
							false,
							"_srcs",
							previous.src,
							"string"
					));
			
		} 
        catch (Throwable e) {// TODO handle Excpetion much more precise
			ExceptionUtil.rethrowIfNecessary(e);
			throw new PageRuntimeException(Caster.toPageException(e));
		}
		   
	}
	
	private static class Previous {
		public Previous(Tag tag) {
			this.tag=tag;
		}
		private List<String> ids=new ArrayList<String>();
		private Expression src=null;
		private Tag tag;
		
	}
	
}