Either <CompleterError, string> GenerateProperty(IPropertySymbol property, BindableInfo bindableInfo)
{
Func <Chang, string, Either <CompleterError, MethodCallInfo> > getCallInfo = (chang, attributeMethodName) => {
var methodName = attributeMethodName ?? $"On{property.Name}Chang{chang}".If(x => property.IsAutoImplemented());
if (methodName != null && GetMethods(methodName).Length > 1)
{
return(CompleterError.CreatePropertyError(property, Messages.POCO_MoreThanOnePropertyChangedMethod(chang)));
}
var method = methodName.With(x => GetMethods(x).SingleOrDefault());
if (method == null && attributeMethodName != null)
{
return(CompleterError.CreateForPropertyName(property, Messages.POCO_PropertyChangedMethodNotFound(chang).Format(attributeMethodName)));
}
if (method != null)
{
if (method.Parameters.Length > 1)
{
return(CompleterError.CreateMethodError(method, Messages.POCO_PropertyChangedCantHaveMoreThanOneParameter(chang)));
}
if (!method.ReturnsVoid)
{
return(CompleterError.CreateMethodError(method, Messages.POCO_PropertyChangedCantHaveReturnType(chang)));
}
if (method.Parameters.Length == 1 && method.Parameters.Single().Type != property.Type)
{
return(CompleterError.CreateParameterError(method.Parameters.Single(), Messages.POCO_PropertyChangedMethodArgumentTypeShouldMatchPropertyType(chang)));
}
}
var needParameter = method.Return(x => x.Parameters.Length == 1, () => false);
var valueName = needParameter ? (chang == Chang.ed ? "oldValue" : "value") : null;
var methodCall = method.With(x => $"{x.Name}({valueName});".AddTabs(2));
return(new MethodCallInfo(methodCall, needParameter));
};
return(from changed in getCallInfo(Chang.ed, bindableInfo?.OnPropertyChangedMethodName)
from changing in getCallInfo(Chang.ing, bindableInfo?.OnPropertyChangingMethodName)
select GenerateProperty(property, changed, changing));
}
