static CodeAction HandleNegatedCase(BaseRefactoringContext ctx, IfElseStatement ifElseStatement, Match match, out IsExpression isExpression, out int foundCastCount)
{
foundCastCount = 0;
var outerIs = match.Get <Expression>("isExpression").Single();
isExpression = AlUtil.GetInnerMostExpression(outerIs) as IsExpression;
var obj = AlUtil.GetInnerMostExpression(isExpression.Expression);
var castToType = isExpression.Type;
var cast = new Choice {
PatternHelper.OptionalParentheses(PatternHelper.OptionalParentheses(obj.Clone()).CastTo(castToType.Clone())),
PatternHelper.OptionalParentheses(PatternHelper.OptionalParentheses(obj.Clone()).CastAs(castToType.Clone()))
};
var rr = ctx.Resolve(castToType);
if (rr == null || rr.IsError || rr.Type.IsReferenceType == false)
{
return(null);
}
var foundCasts = ifElseStatement.GetParent <BlockStatement>().DescendantNodes(n => n.StartLocation >= ifElseStatement.StartLocation && !cast.IsMatch(n)).Where(n => cast.IsMatch(n)).ToList();
foundCastCount = foundCasts.Count;
return(new CodeAction(ctx.TranslateString("Use 'as' and check for null"), script => {
var varName = ctx.GetNameProposal(CreateMethodDeclarationAction.GuessNameFromType(rr.Type), ifElseStatement.StartLocation);
var varDec = new VariableDeclarationStatement(new PrimitiveType("var"), varName, new AsExpression(obj.Clone(), castToType.Clone()));
var binaryOperatorIdentifier = new IdentifierExpression(varName);
var binaryOperatorExpression = new BinaryOperatorExpression(binaryOperatorIdentifier, BinaryOperatorType.Equality, new NullReferenceExpression());
var linkedNodes = new List <AstNode>();
linkedNodes.Add(varDec.Variables.First().NameToken);
linkedNodes.Add(binaryOperatorIdentifier);
if (IsEmbeddedStatement(ifElseStatement))
{
var block = new BlockStatement();
block.Add(varDec);
var newIf = (IfElseStatement)ifElseStatement.Clone();
newIf.Condition = binaryOperatorExpression;
foreach (var node in newIf.DescendantNodesAndSelf(n => !cast.IsMatch(n)).Where(n => cast.IsMatch(n)))
{
var id = new IdentifierExpression(varName);
linkedNodes.Add(id);
node.ReplaceWith(id);
}
block.Add(newIf);
script.Replace(ifElseStatement, block);
}
else
{
script.InsertBefore(ifElseStatement, varDec);
script.Replace(ifElseStatement.Condition, binaryOperatorExpression);
foreach (var c in foundCasts)
{
var id = new IdentifierExpression(varName);
linkedNodes.Add(id);
script.Replace(c, id);
}
}
script.Link(linkedNodes);
}, isExpression.IsToken));
}