protected  void addError(String msg,
    ASTNode expr) 
{
        int line = expr.getLineNumber();
        int col = expr.getColumnNumber();
        SourceUnit source = getSourceUnit();
        source.getErrorCollector().addErrorAndContinue(
          new SyntaxErrorMessage(new SyntaxException(msg + '\n", line, col), source)
        );
}

 abstract protected SourceUnit getSourceUnit()

 public  void visitAnnotations(AnnotatedNode node) 
{
        List annotions = node.getAnnotations();
        if (annotions.isEmpty()) return;
        Iterator it = annotions.iterator();
        while (it.hasNext()) {
            AnnotationNode an = (AnnotationNode) it.next();
            //skip builtin properties
            if (an.isBuiltIn()) continue;
            for (Iterator iter = an.getMembers().entrySet().iterator(); iter.hasNext();) {
                Map.Entry member = (Map.Entry) iter.next();
                Expression memberValue = (Expression) member.getValue();
                memberValue.visit(this);
            }  
        }
}

 public  void visitAssertStatement(AssertStatement statement) 
{
        visitStatement(statement);
        super.visitAssertStatement(statement);
}

 public  void visitBlockStatement(BlockStatement block) 
{
        visitStatement(block);
        super.visitBlockStatement(block);
}

 public  void visitBreakStatement(BreakStatement statement) 
{
        visitStatement(statement);
        super.visitBreakStatement(statement);
}

 public  void visitCaseStatement(CaseStatement statement) 
{
        visitStatement(statement);
        super.visitCaseStatement(statement);
}

 public  void visitCatchStatement(CatchStatement statement) 
{
        visitStatement(statement);
        super.visitCatchStatement(statement);
}

 public  void visitClass(ClassNode node) 
{
        visitAnnotations(node);
        node.visitContents(this);
        List list = node.getObjectInitializerStatements();
        for (Iterator iter = list.iterator(); iter.hasNext();) {
            Statement element = (Statement) iter.next();
            element.visit(this);
        }
}

 protected  void visitClassCodeContainer(Statement code) 
{
        if (code != null) code.visit(this);
}

 public  void visitConstructor(ConstructorNode node) 
{
        visitConstructorOrMethod(node,true);
}

 protected  void visitConstructorOrMethod(MethodNode node,
    boolean isConstructor) 
{
        visitAnnotations(node);
        Statement code = node.getCode();
        visitClassCodeContainer(code);
}

 public  void visitContinueStatement(ContinueStatement statement) 
{
        visitStatement(statement);
        super.visitContinueStatement(statement);
}

 public  void visitDoWhileLoop(DoWhileStatement loop) 
{
        visitStatement(loop);
        super.visitDoWhileLoop(loop);
}

 public  void visitExpressionStatement(ExpressionStatement statement) 
{
        visitStatement(statement);
        super.visitExpressionStatement(statement);
}

 public  void visitField(FieldNode node) 
{
        visitAnnotations(node);
        Expression init = node.getInitialExpression();
        if (init != null) init.visit(this);
}

 public  void visitForLoop(ForStatement forLoop) 
{
        visitStatement(forLoop);
        super.visitForLoop(forLoop);
}

 public  void visitIfElse(IfStatement ifElse) 
{
        visitStatement(ifElse);
        super.visitIfElse(ifElse);
}

 public  void visitMethod(MethodNode node) 
{
        visitConstructorOrMethod(node,false);
}

 public  void visitProperty(PropertyNode node) 
{
        visitAnnotations(node);
        Statement statement = node.getGetterBlock();
        visitClassCodeContainer(statement);
        statement = node.getSetterBlock();
        visitClassCodeContainer(statement);
        Expression init = node.getInitialExpression();
        if (init != null) init.visit(this);
}

 public  void visitReturnStatement(ReturnStatement statement) 
{
        visitStatement(statement);
        super.visitReturnStatement(statement);
}

 protected  void visitStatement(Statement statement) 
{

}

 public  void visitSwitch(SwitchStatement statement) 
{
        visitStatement(statement);
        super.visitSwitch(statement);
}

 public  void visitSynchronizedStatement(SynchronizedStatement statement) 
{
        visitStatement(statement);
        super.visitSynchronizedStatement(statement);
}

 public  void visitThrowStatement(ThrowStatement statement) 
{
        visitStatement(statement);
        super.visitThrowStatement(statement);
}

 public  void visitTryCatchFinally(TryCatchStatement statement) 
{
        visitStatement(statement);
        super.visitTryCatchFinally(statement);
}

 public  void visitWhileLoop(WhileStatement loop) 
{
        visitStatement(loop);
        super.visitWhileLoop(loop);
}