001 /* 002 $Id: VerifierCodeVisitor.java 4032 2006-08-30 07:18:49Z mguillem $ 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.classgen; 047 048 import java.util.Iterator; 049 import java.util.List; 050 051 import org.codehaus.groovy.ast.ASTNode; 052 import org.codehaus.groovy.ast.CodeVisitorSupport; 053 import org.codehaus.groovy.ast.stmt.ForStatement; 054 import org.codehaus.groovy.ast.expr.BinaryExpression; 055 import org.codehaus.groovy.ast.expr.Expression; 056 import org.codehaus.groovy.ast.expr.ListExpression; 057 import org.codehaus.groovy.ast.expr.MapEntryExpression; 058 import org.codehaus.groovy.ast.expr.MethodCallExpression; 059 import org.codehaus.groovy.ast.expr.PropertyExpression; 060 import org.codehaus.groovy.ast.expr.FieldExpression; 061 import org.codehaus.groovy.ast.expr.VariableExpression; 062 import org.codehaus.groovy.syntax.RuntimeParserException; 063 import org.objectweb.asm.Opcodes; 064 065 /** 066 * Verifies the method code 067 * 068 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 069 * @version $Revision: 4032 $ 070 */ 071 public class VerifierCodeVisitor extends CodeVisitorSupport implements Opcodes { 072 073 private Verifier verifier; 074 075 VerifierCodeVisitor(Verifier verifier) { 076 this.verifier = verifier; 077 } 078 079 public void visitMethodCallExpression(MethodCallExpression call) { 080 super.visitMethodCallExpression(call); 081 } 082 083 public void visitForLoop(ForStatement expression) { 084 assertValidIdentifier(expression.getVariable().getName(), "for loop variable name", expression); 085 super.visitForLoop(expression); 086 } 087 088 public void visitPropertyExpression(PropertyExpression expression) { 089 // assertValidIdentifier(expression.getProperty(), "property name", expression); // This has been commented out to fix the issue Groovy-843 090 super.visitPropertyExpression(expression); 091 } 092 093 public void visitFieldExpression(FieldExpression expression) { 094 assertValidIdentifier(expression.getFieldName(), "field name", expression); 095 super.visitFieldExpression(expression); 096 } 097 098 public void visitVariableExpression(VariableExpression expression) { 099 assertValidIdentifier(expression.getName(), "variable name", expression); 100 super.visitVariableExpression(expression); 101 } 102 103 public void visitBinaryExpression(BinaryExpression expression) { 104 /* 105 if (verifier.getClassNode().isScript() && expression.getOperation().getType() == Token.EQUAL) { 106 // lets turn variable assignments into property assignments 107 Expression left = expression.getLeftExpression(); 108 if (left instanceof VariableExpression) { 109 VariableExpression varExp = (VariableExpression) left; 110 111 //System.out.println("Converting variable expression: " + varExp.getVariable()); 112 113 PropertyExpression propExp = 114 new PropertyExpression(VariableExpression.THIS_EXPRESSION, varExp.getVariable()); 115 expression.setLeftExpression(propExp); 116 } 117 } 118 */ 119 super.visitBinaryExpression(expression); 120 } 121 122 public static void assertValidIdentifier(String name, String message, ASTNode node) { 123 int size = name.length(); 124 if (size <= 0) { 125 throw new RuntimeParserException("Invalid " + message + ". Identifier must not be empty", node); 126 } 127 char firstCh = name.charAt(0); 128 if (!Character.isJavaIdentifierStart(firstCh) || firstCh == '$') { 129 throw new RuntimeParserException("Invalid " + message + ". Must start with a letter but was: " + name, node); 130 } 131 132 for (int i = 1; i < size; i++) { 133 char ch = name.charAt(i); 134 if (!Character.isJavaIdentifierPart(ch)) { 135 throw new RuntimeParserException("Invalid " + message + ". Invalid character at position: " + (i + 1) + " of value: " + ch + " in name: " + name, node); 136 } 137 } 138 } 139 140 public void visitListExpression(ListExpression expression) { 141 List expressions = expression.getExpressions(); 142 for (Iterator iter = expressions.iterator(); iter.hasNext();) { 143 Object element = iter.next(); 144 if (element instanceof MapEntryExpression) { 145 throw new RuntimeParserException ("no map entry allowed at this place",(Expression) element); 146 } 147 } 148 super.visitListExpression(expression); 149 } 150 }