1 files changed, 56 insertions, 0 deletions
diff --git a/org.eclipse.cdt.codan.extension/src/org/eclipse/cdt/codan/extension/ASTParserUtil.java b/org.eclipse.cdt.codan.extension/src/org/eclipse/cdt/codan/extension/ASTParserUtil.java
new file mode 100644
index 0000000..0591464
--- /dev/null
+++ b/org.eclipse.cdt.codan.extension/src/org/eclipse/cdt/codan/extension/ASTParserUtil.java
@@ -0,0 +1,56 @@
+/*******************************************************************************
+ * 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;
+	}
+	
+}