001 /* 002 $Id: GStringExpression.java,v 1.12 2005/05/20 16:28:49 phk Exp $ 003 004 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 006 Redistribution and use of this software and associated documentation 007 ("Software"), with or without modification, are permitted provided 008 that the following conditions are met: 009 010 1. Redistributions of source code must retain copyright 011 statements and notices. Redistributions must also contain a 012 copy of this document. 013 014 2. Redistributions in binary form must reproduce the 015 above copyright notice, this list of conditions and the 016 following disclaimer in the documentation and/or other 017 materials provided with the distribution. 018 019 3. The name "groovy" must not be used to endorse or promote 020 products derived from this Software without prior written 021 permission of The Codehaus. For written permission, 022 please contact info@codehaus.org. 023 024 4. Products derived from this Software may not be called "groovy" 025 nor may "groovy" appear in their names without prior written 026 permission of The Codehaus. "groovy" is a registered 027 trademark of The Codehaus. 028 029 5. Due credit should be given to The Codehaus - 030 http://groovy.codehaus.org/ 031 032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 043 OF THE POSSIBILITY OF SUCH DAMAGE. 044 045 */ 046 package org.codehaus.groovy.ast.expr; 047 048 import groovy.lang.GString; 049 050 import java.util.ArrayList; 051 import java.util.Iterator; 052 import java.util.List; 053 054 import org.codehaus.groovy.ast.GroovyCodeVisitor; 055 import org.codehaus.groovy.classgen.AsmClassGenerator; 056 057 /** 058 * Represents a String expression which contains embedded values inside 059 * it such as "hello there ${user} how are you" which is expanded lazily 060 * 061 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 062 * @version $Revision: 1.12 $ 063 */ 064 public class GStringExpression extends Expression { 065 066 private String verbatimText; 067 private List strings = new ArrayList(); 068 private List values = new ArrayList(); 069 070 public GStringExpression(String verbatimText) { 071 this.verbatimText = verbatimText; 072 super.setTypeClass(GString.class); 073 } 074 075 public GStringExpression(String verbatimText, List strings, List values) { 076 this.verbatimText = verbatimText; 077 this.strings = strings; 078 this.values = values; 079 super.setTypeClass(GString.class); 080 } 081 082 public void visit(GroovyCodeVisitor visitor) { 083 visitor.visitGStringExpression(this); 084 } 085 086 public Expression transformExpression(ExpressionTransformer transformer) { 087 return new GStringExpression( 088 verbatimText, 089 transformExpressions(strings, transformer), 090 transformExpressions(values, transformer)); 091 } 092 093 protected void resolveType(AsmClassGenerator resolver) { 094 // 095 } 096 097 public String toString() { 098 return super.toString() + "[strings: " + strings + " values: " + values + "]"; 099 } 100 101 public String getText() { 102 return verbatimText; 103 } 104 105 public List getStrings() { 106 return strings; 107 } 108 109 public List getValues() { 110 return values; 111 } 112 113 public void addString(ConstantExpression text) { 114 if (text == null) { 115 throw new NullPointerException("Cannot add a null text expression"); 116 } 117 strings.add(text); 118 } 119 120 public void addValue(Expression value) { 121 // If the first thing is an value, then we need a dummy empty string in front of it so that when we 122 // toString it they come out in the correct order. 123 if (strings.size() == 0) 124 strings.add(ConstantExpression.EMPTY_STRING); 125 values.add(value); 126 } 127 128 public Expression getValue(int idx) { 129 return (Expression) values.get(idx); 130 } 131 132 public boolean isConstantString() { 133 return values.isEmpty(); 134 } 135 136 public Expression asConstantString() { 137 StringBuffer buffer = new StringBuffer(); 138 for (Iterator iter = strings.iterator(); iter.hasNext();) { 139 ConstantExpression expression = (ConstantExpression) iter.next(); 140 Object value = expression.getValue(); 141 if (value != null) { 142 buffer.append(value); 143 } 144 } 145 return new ConstantExpression(buffer.toString()); 146 } 147 }