private static void ProcessField(ClassTemplate source, INamedTypeSymbol classSymbol, INamedTypeSymbol attributeSymbol, IFieldSymbol fieldSymbol)
{
var fieldName = fieldSymbol.Name;
var fieldType = fieldSymbol.Type;
string propertyName = GenerateName(fieldName);
var attributeData = fieldSymbol.GetAttributes().Single(ad => ad.AttributeClass.Equals(attributeSymbol, SymbolEqualityComparer.Default));
var initialValueOpt = attributeData.NamedArguments.SingleOrDefault(kvp => kvp.Key == "InitialValue").Value;
var dependencyPropertyValue = initialValueOpt.Value is null ?
@$ "DependencyProperty.Register(" "{propertyName}" ", typeof({fieldType}), typeof({classSymbol.Name}))" :
@$ "DependencyProperty.Register(" "{propertyName}" ", typeof({fieldType}), typeof({classSymbol.Name}), new PropertyMetadata({initialValueOpt.ToCSharpString()}))";
source
.WithField(
new FieldTemplate()
.WithModifiers(Modifier.Public, Modifier.Static, Modifier.Readonly)
.WithType("DependencyProperty")
.WithName(propertyName + DependencyPropertySuffix)
.WithValue(dependencyPropertyValue))
.WithProperty(
new PropertyTemplate()
.WithType(fieldType.ToString())
.WithName(propertyName)
.WithGetter(
new GetterTemplate()
.WithCode(
new CodeBlockTemplate()
.WithLine($"this.{fieldName} = ({fieldType})this.GetValue({propertyName + DependencyPropertySuffix});")
.WithLine($"return ({fieldType})this.GetValue({propertyName + DependencyPropertySuffix});")))
.WithSetter(
new SetterTemplate()
.WithCode(
new CodeBlockTemplate()
.WithLine($"this.{fieldName} = value;")
.WithLine($"this.SetValue({propertyName + DependencyPropertySuffix}, value);"))));
}