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/*
* [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;
}
public String toString() {
if ( initValue!=null ) {
return type+" "+name+"="+initValue;
}
return type+" "+name;
}
}
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