1/* 2 * [The "BSD license"] 3 * Copyright (c) 2010 Terence Parr 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29package org.antlr.tool; 30 31/** Track the names of attributes define in arg lists, return values, 32 * scope blocks etc... 33 */ 34public class Attribute { 35 /** The entire declaration such as "String foo;" */ 36 public String decl; 37 38 /** The type; might be empty such as for Python which has no static typing */ 39 public String type; 40 41 /** The name of the attribute "foo" */ 42 public String name; 43 44 /** The optional attribute intialization expression */ 45 public String initValue; 46 47 public Attribute(String decl) { 48 extractAttribute(decl); 49 } 50 51 public Attribute(String name, String decl) { 52 this.name = name; 53 this.decl = decl; 54 } 55 56 /** For decls like "String foo" or "char *foo32[3]" compute the ID 57 * and type declarations. Also handle "int x=3" and 'T t = new T("foo")' 58 * but if the separator is ',' you cannot use ',' in the initvalue. 59 * AttributeScope.addAttributes takes care of the separation so we are 60 * free here to use from '=' to end of string as the expression. 61 * 62 * Set name, type, initvalue, and full decl instance vars. 63 */ 64 protected void extractAttribute(String decl) { 65 if ( decl==null ) { 66 return; 67 } 68 boolean inID = false; 69 int start = -1; 70 int rightEdgeOfDeclarator = decl.length()-1; 71 int equalsIndex = decl.indexOf('='); 72 if ( equalsIndex>0 ) { 73 // everything after the '=' is the init value 74 this.initValue = decl.substring(equalsIndex+1,decl.length()); 75 rightEdgeOfDeclarator = equalsIndex-1; 76 } 77 // walk backwards looking for start of an ID 78 for (int i=rightEdgeOfDeclarator; i>=0; i--) { 79 // if we haven't found the end yet, keep going 80 if ( !inID && Character.isLetterOrDigit(decl.charAt(i)) ) { 81 inID = true; 82 } 83 else if ( inID && 84 !(Character.isLetterOrDigit(decl.charAt(i))|| 85 decl.charAt(i)=='_') ) { 86 start = i+1; 87 break; 88 } 89 } 90 if ( start<0 && inID ) { 91 start = 0; 92 } 93 if ( start<0 ) { 94 ErrorManager.error(ErrorManager.MSG_CANNOT_FIND_ATTRIBUTE_NAME_IN_DECL,decl); 95 } 96 // walk forwards looking for end of an ID 97 int stop=-1; 98 for (int i=start; i<=rightEdgeOfDeclarator; i++) { 99 // if we haven't found the end yet, keep going 100 if ( !(Character.isLetterOrDigit(decl.charAt(i))|| 101 decl.charAt(i)=='_') ) 102 { 103 stop = i; 104 break; 105 } 106 if ( i==rightEdgeOfDeclarator ) { 107 stop = i+1; 108 } 109 } 110 111 // the name is the last ID 112 this.name = decl.substring(start,stop); 113 114 // the type is the decl minus the ID (could be empty) 115 this.type = decl.substring(0,start); 116 if ( stop<=rightEdgeOfDeclarator ) { 117 this.type += decl.substring(stop,rightEdgeOfDeclarator+1); 118 } 119 this.type = type.trim(); 120 if ( this.type.length()==0 ) { 121 this.type = null; 122 } 123 124 this.decl = decl; 125 } 126 127 public String toString() { 128 if ( initValue!=null ) { 129 return type+" "+name+"="+initValue; 130 } 131 return type+" "+name; 132 } 133} 134 135