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.bytecode.op; 020 021import lucee.transformer.bytecode.BytecodeContext; 022import lucee.transformer.bytecode.BytecodeException; 023import lucee.transformer.bytecode.Literal; 024import lucee.transformer.bytecode.cast.CastString; 025import lucee.transformer.bytecode.expression.ExprString; 026import lucee.transformer.bytecode.expression.Expression; 027import lucee.transformer.bytecode.expression.ExpressionBase; 028import lucee.transformer.bytecode.literal.LitString; 029import lucee.transformer.bytecode.util.Types; 030 031import org.objectweb.asm.Type; 032import org.objectweb.asm.commons.Method; 033 034public final class OpString extends ExpressionBase implements ExprString { 035 036 private ExprString right; 037 private ExprString left; 038 039 // String concat (String) 040 private final static Method METHOD_CONCAT = new Method("concat", 041 Types.STRING, 042 new Type[]{Types.STRING}); 043 044 private OpString(Expression left, Expression right) { 045 super(left.getStart(),right.getEnd()); 046 this.left=CastString.toExprString(left); 047 this.right=CastString.toExprString(right); 048 } 049 050 /** 051 * Create a String expression from a Expression 052 * @param left 053 * @param right 054 * 055 * @return String expression 056 */ 057 public static ExprString toExprString(Expression left, Expression right) { 058 return toExprString(left, right, true); 059 } 060 061 public static ExprString toExprString(Expression left, Expression right, boolean concatStatic) { 062 if(concatStatic && left instanceof Literal && right instanceof Literal) { 063 String l = ((Literal)left).getString(); 064 String r = ((Literal)right).getString(); 065 if((l.length()+r.length())<=LitString.MAX_SIZE)return LitString.toExprString(l.concat(r),left.getStart(),right.getEnd()); 066 } 067 return new OpString(left,right); 068 } 069 070 071 /** 072 * 073 * @see lucee.transformer.bytecode.expression.ExpressionBase#_writeOut(org.objectweb.asm.commons.GeneratorAdapter, int) 074 */ 075 public Type _writeOut(BytecodeContext bc, int mode) throws BytecodeException { 076 left.writeOut(bc,MODE_REF); 077 right.writeOut(bc,MODE_REF); 078 bc.getAdapter().invokeVirtual(Types.STRING,METHOD_CONCAT); 079 return Types.STRING; 080 } 081 082 /* * 083 * @see lucee.transformer.bytecode.expression.Expression#getType() 084 * / 085 public int getType() { 086 return Types._STRING; 087 }*/ 088 089}