internal static bool AssignsValueToBackingField(AccessorDeclarationSyntax setter, out AssignmentExpressionSyntax assignment)
{
using (var pooled = AssignmentWalker.Create(setter))
{
foreach (var a in pooled.Item.Assignments)
{
if ((a.Right as IdentifierNameSyntax)?.Identifier.ValueText != "value")
{
continue;
}
if (a.Left is IdentifierNameSyntax)
{
assignment = a;
return(true);
}
var memberAccess = a.Left as MemberAccessExpressionSyntax;
if (memberAccess?.Expression is ThisExpressionSyntax &&
memberAccess.Name is IdentifierNameSyntax)
{
assignment = a;
return(true);
}
}
}
assignment = null;
return(false);
}
internal static bool TryGetBackingField(PropertyDeclarationSyntax property, out IdentifierNameSyntax field, out FieldDeclarationSyntax fieldDeclaration)
{
field = null;
fieldDeclaration = null;
if (property == null)
{
return(false);
}
AccessorDeclarationSyntax setter;
if (property.TryGetSetAccessorDeclaration(out setter) &&
setter.Body != null)
{
using (var pooled = AssignmentWalker.Create(setter))
{
if (pooled.Item.Assignments.Count != 1)
{
return(false);
}
var left = pooled.Item.Assignments[0].Left;
field = left as IdentifierNameSyntax;
if (field == null)
{
var memberAccess = left as MemberAccessExpressionSyntax;
if (!(memberAccess?.Expression is ThisExpressionSyntax))
{
return(false);
}
field = memberAccess.Name as IdentifierNameSyntax;
}
if (field == null)
{
return(false);
}
foreach (var member in property.FirstAncestorOrSelf <TypeDeclarationSyntax>().Members)
{
fieldDeclaration = member as FieldDeclarationSyntax;
if (fieldDeclaration != null)
{
foreach (var variable in fieldDeclaration.Declaration.Variables)
{
if (variable.Identifier.ValueText == field.Identifier.ValueText)
{
return(true);
}
}
}
}
}
}
return(false);
}