| /* |
| * [The "BSD license"] |
| * Copyright (c) 2010 Terence Parr |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.antlr.tool; |
| |
| /** Track the names of attributes define in arg lists, return values, |
| * scope blocks etc... |
| */ |
| public class Attribute { |
| /** The entire declaration such as "String foo;" */ |
| public String decl; |
| |
| /** The type; might be empty such as for Python which has no static typing */ |
| public String type; |
| |
| /** The name of the attribute "foo" */ |
| public String name; |
| |
| /** The optional attribute intialization expression */ |
| public String initValue; |
| |
| public Attribute(String decl) { |
| extractAttribute(decl); |
| } |
| |
| public Attribute(String name, String decl) { |
| this.name = name; |
| this.decl = decl; |
| } |
| |
| /** For decls like "String foo" or "char *foo32[3]" compute the ID |
| * and type declarations. Also handle "int x=3" and 'T t = new T("foo")' |
| * but if the separator is ',' you cannot use ',' in the initvalue. |
| * AttributeScope.addAttributes takes care of the separation so we are |
| * free here to use from '=' to end of string as the expression. |
| * |
| * Set name, type, initvalue, and full decl instance vars. |
| */ |
| protected void extractAttribute(String decl) { |
| if ( decl==null ) { |
| return; |
| } |
| boolean inID = false; |
| int start = -1; |
| int rightEdgeOfDeclarator = decl.length()-1; |
| int equalsIndex = decl.indexOf('='); |
| if ( equalsIndex>0 ) { |
| // everything after the '=' is the init value |
| this.initValue = decl.substring(equalsIndex+1,decl.length()); |
| rightEdgeOfDeclarator = equalsIndex-1; |
| } |
| // walk backwards looking for start of an ID |
| for (int i=rightEdgeOfDeclarator; i>=0; i--) { |
| // if we haven't found the end yet, keep going |
| if ( !inID && Character.isLetterOrDigit(decl.charAt(i)) ) { |
| inID = true; |
| } |
| else if ( inID && |
| !(Character.isLetterOrDigit(decl.charAt(i))|| |
| decl.charAt(i)=='_') ) { |
| start = i+1; |
| break; |
| } |
| } |
| if ( start<0 && inID ) { |
| start = 0; |
| } |
| if ( start<0 ) { |
| ErrorManager.error(ErrorManager.MSG_CANNOT_FIND_ATTRIBUTE_NAME_IN_DECL,decl); |
| } |
| // walk forwards looking for end of an ID |
| int stop=-1; |
| for (int i=start; i<=rightEdgeOfDeclarator; i++) { |
| // if we haven't found the end yet, keep going |
| if ( !(Character.isLetterOrDigit(decl.charAt(i))|| |
| decl.charAt(i)=='_') ) |
| { |
| stop = i; |
| break; |
| } |
| if ( i==rightEdgeOfDeclarator ) { |
| stop = i+1; |
| } |
| } |
| |
| // the name is the last ID |
| this.name = decl.substring(start,stop); |
| |
| // the type is the decl minus the ID (could be empty) |
| this.type = decl.substring(0,start); |
| if ( stop<=rightEdgeOfDeclarator ) { |
| this.type += decl.substring(stop,rightEdgeOfDeclarator+1); |
| } |
| this.type = type.trim(); |
| if ( this.type.length()==0 ) { |
| this.type = null; |
| } |
| |
| this.decl = decl; |
| } |
| |
| @Override |
| public String toString() { |
| if ( initValue!=null ) { |
| return type+" "+name+"="+initValue; |
| } |
| return type+" "+name; |
| } |
| } |
| |