001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019package lucee.transformer.cfml.evaluator.impl; 020 021import lucee.commons.lang.ExceptionUtil; 022import lucee.commons.lang.StringUtil; 023import lucee.transformer.bytecode.cast.Cast; 024import lucee.transformer.bytecode.cast.CastString; 025import lucee.transformer.bytecode.expression.Expression; 026import lucee.transformer.bytecode.expression.var.Variable; 027import lucee.transformer.bytecode.expression.var.VariableString; 028import lucee.transformer.bytecode.literal.LitString; 029import lucee.transformer.bytecode.statement.tag.Attribute; 030import lucee.transformer.bytecode.statement.tag.Tag; 031import lucee.transformer.bytecode.statement.tag.TagBreak; 032import lucee.transformer.bytecode.util.ASMUtil; 033import lucee.transformer.cfml.evaluator.EvaluatorException; 034import lucee.transformer.cfml.evaluator.EvaluatorSupport; 035import lucee.transformer.library.tag.TagLibTag; 036 037 038 039/** 040 * Prueft den Kontext des Tag break. 041 * Das Tag <code>break</code> darf nur innerhalb des Tag <code>loop, while, foreach</code> liegen. 042 */ 043public final class Break extends EvaluatorSupport { 044 045 046 @Override 047 public void evaluate(Tag tag,TagLibTag libTag) throws EvaluatorException { 048 String ns=libTag.getTagLib().getNameSpaceAndSeparator(); 049 String loopName=ns+"loop"; 050 String whileName=ns+"while"; 051 052 053 // label 054 String label=null; 055 056 Attribute attrLabel = tag.getAttribute("label"); 057 if(attrLabel!=null){ 058 TagBreak tb=(TagBreak) tag; 059 label=variableToString(tag,attrLabel,null); 060 if(label!=null){ 061 tb.setLabel(label=label.trim()); 062 tag.removeAttribute("label"); 063 } 064 065 else if(ASMUtil.isLiteralAttribute(tag, attrLabel, ASMUtil.TYPE_STRING, false, true)) { 066 LitString ls=(LitString) CastString.toExprString(tag.getAttribute("label").getValue()); 067 label = ls.getString(); 068 if(!StringUtil.isEmpty(label,true)) { 069 tb.setLabel(label=label.trim()); 070 tag.removeAttribute("label"); 071 } 072 else label=null; 073 } 074 } 075 076 // no base tag found 077 if(!ASMUtil.hasAncestorBreakFCStatement(tag,label)) { 078 if(tag.isScriptBase()) { 079 if(StringUtil.isEmpty(label)) 080 throw new EvaluatorException("Wrong Context, "+libTag.getName()+" must be inside a looping statement or tag"); 081 throw new EvaluatorException("Wrong Context, "+libTag.getName()+" must be inside a looping statement or tag with the label ["+label+"]"); 082 083 } 084 085 086 if(StringUtil.isEmpty(label)) 087 throw new EvaluatorException("Wrong Context, tag "+libTag.getFullName()+" must be inside a "+loopName+" or "+whileName+" tag"); 088 throw new EvaluatorException("Wrong Context, tag "+libTag.getFullName()+" must be inside a "+loopName+" or "+whileName+" tag with the label ["+label+"]"); 089 090 } 091 092 } 093 094 static String variableToString(Tag tag, Attribute attrLabel, String defaultValue) { 095 Expression value = attrLabel.getValue(); 096 while(value instanceof Cast) value=((Cast)value).getExpr(); 097 if(value instanceof Variable) { 098 Variable var=(Variable)value; 099 try { 100 return VariableString.variableToString(var, true); 101 } catch (Throwable t) { 102 ExceptionUtil.rethrowIfNecessary(t); 103 } 104 } 105 return defaultValue; 106 } 107 108}