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/*******************************************************************************
* Copyright (c) 2009 Elliott Baron
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Elliott Baron - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.codan.extension;
import org.eclipse.cdt.core.dom.ast.ASTTypeUtil;
import org.eclipse.cdt.core.dom.ast.IASTCastExpression;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTLiteralExpression;
import org.eclipse.cdt.core.dom.ast.IASTTypeId;
import org.eclipse.cdt.core.dom.ast.IASTUnaryExpression;
public class ASTParserUtil {
public static Boolean getTruthValue(IASTExpression valueExpr) {
Boolean result = null;
// Handle assignment from literals
result = getLiteralTruth(valueExpr);
// Handle NULL assignment, assume NULL is defined as (void *)0
if (valueExpr instanceof IASTUnaryExpression) {
IASTExpression op = ((IASTUnaryExpression) valueExpr).getOperand();
if (op instanceof IASTCastExpression) {
IASTCastExpression castExpr = (IASTCastExpression) op;
IASTTypeId castType = castExpr.getTypeId();
String typeString = ASTTypeUtil.getType(castType);
if (typeString.equals("void *")) {
result = getLiteralTruth(castExpr.getOperand());
}
}
}
// TODO other variable assignments
return result;
}
private static Boolean getLiteralTruth(IASTExpression valueExpr) {
Boolean result = null;
if (valueExpr instanceof IASTLiteralExpression) {
int kind = ((IASTLiteralExpression) valueExpr).getKind();
String value = String.valueOf(((IASTLiteralExpression) valueExpr).getValue());
switch (kind) {
case IASTLiteralExpression.lk_integer_constant:
// 0 = False, > 0 = True
result = !value.equals("0");
}
}
return result;
}
}
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