/// <summary> Apply mutations to an <see cref="InvocationExpressionSyntax"/> </summary>
public override IEnumerable <Mutation> ApplyMutations(InvocationExpressionSyntax parent)
{
if (parent.Expression is MemberAccessExpressionSyntax node)
{
if (Enum.TryParse(node.Name.Identifier.ValueText, out LinqExpression expression) &&
KindsToMutate.TryGetValue(expression, out var replacementExpression))
{
var replacement = SyntaxFactory.IdentifierName(replacementExpression.ToString());
var displayName = $"Linq method mutation ({node.Name.Identifier.ValueText}() to {replacement}())";
if (RequireArguments.Contains(replacementExpression) && parent.ArgumentList.Arguments.Count == 0)
{
yield break;
}
yield return(new Mutation
{
DisplayName = displayName,
OriginalNode = parent,
ReplacementNode = parent.ReplaceNode(node.Name, replacement),
Type = Mutator.Linq
});
}
}
}
/// <summary> Apply mutations to an <see cref="InvocationExpressionSyntax"/> </summary>
public override IEnumerable <Mutation> ApplyMutations(ExpressionSyntax expr)
{
var original = expr;
if (expr.Parent is ConditionalAccessExpressionSyntax)
{
yield break;
}
while (expr is ConditionalAccessExpressionSyntax conditional)
{
expr = conditional.WhenNotNull;
}
if (!(expr is InvocationExpressionSyntax invocationExpression))
{
yield break;
}
string memberName;
SyntaxNode toReplace;
switch (invocationExpression.Expression)
{
case MemberAccessExpressionSyntax node:
toReplace = node.Name;
memberName = node.Name.Identifier.ValueText;
break;
case MemberBindingExpressionSyntax binding:
toReplace = binding.Name;
memberName = binding.Name.Identifier.ValueText;
break;
default:
yield break;
}
if (!Enum.TryParse(memberName, out LinqExpression expression) ||
!KindsToMutate.TryGetValue(expression, out var replacementExpression))
{
yield break;
}
var replacement = SyntaxFactory.IdentifierName(replacementExpression.ToString());
var displayName = $"Linq method mutation ({memberName}() to {replacement}())";
if (RequireArguments.Contains(replacementExpression) && invocationExpression.ArgumentList.Arguments.Count == 0)
{
yield break;
}
yield return(new Mutation
{
DisplayName = displayName,
OriginalNode = original,
ReplacementNode = original.ReplaceNode(toReplace, replacement),
Type = Mutator.Linq
});
}
private static IEnumerable <Mutation> FindMutableMethodCalls(ExpressionSyntax node, ExpressionSyntax original)
{
while (node is ConditionalAccessExpressionSyntax conditional)
{
foreach (var subMutants in FindMutableMethodCalls(conditional.Expression, original))
{
yield return(subMutants);
}
node = conditional.WhenNotNull;
}
for (; ;)
{
ExpressionSyntax next = null;
if (!(node is InvocationExpressionSyntax invocationExpression))
{
yield break;
}
string memberName;
SyntaxNode toReplace;
switch (invocationExpression.Expression)
{
case MemberAccessExpressionSyntax memberAccessExpression:
toReplace = memberAccessExpression.Name;
memberName = memberAccessExpression.Name.Identifier.ValueText;
next = memberAccessExpression.Expression;
break;
case MemberBindingExpressionSyntax memberBindingExpression:
toReplace = memberBindingExpression.Name;
memberName = memberBindingExpression.Name.Identifier.ValueText;
break;
default:
yield break;
}
if (Enum.TryParse(memberName, out LinqExpression expression) &&
KindsToMutate.TryGetValue(expression, out var replacementExpression))
{
if (RequireArguments.Contains(replacementExpression) &&
invocationExpression.ArgumentList.Arguments.Count == 0)
{
yield break;
}
yield return(new Mutation
{
DisplayName =
$"Linq method mutation ({memberName}() to {SyntaxFactory.IdentifierName(replacementExpression.ToString())}())",
OriginalNode = original,
ReplacementNode = original.ReplaceNode(toReplace,
SyntaxFactory.IdentifierName(replacementExpression.ToString())),
Type = Mutator.Linq
});
}
node = next;
}
}