/// <summary>
/// Returns those XAML namespace definitions for which a conditional is set, grouped by those for which the conditional returns true and
/// should be included, and those for which it returns fales and should be excluded.
/// </summary>
private (List <XmlAttribute> IncludedConditionals, List <XmlAttribute> ExcludedConditionals) FindConditionals(XmlDocument document)
{
var included = new List <XmlAttribute>();
var excluded = new List <XmlAttribute>();
foreach (XmlAttribute attr in document.DocumentElement.Attributes)
{
if (attr.Prefix != "xmlns")
{
// Not a namespace
continue;
}
var valueSplit = attr.Value.Split('?');
if (valueSplit.Length != 2)
{
// Not a (valid) conditional
continue;
}
if (ShouldInclude() is bool shouldInclude)
{
if (shouldInclude)
{
included.Add(attr);
}
else
{
excluded.Add(attr);
}
}
bool?ShouldInclude()
{
var elements = valueSplit[1].Split('(', ',', ')');
switch (elements[0])
{
case nameof(ApiInformation.IsApiContractPresent):
case nameof(ApiInformation.IsApiContractNotPresent):
if (elements.Length < 4 || !ushort.TryParse(elements[2].Trim(), out var majorVersion))
{
throw new InvalidOperationException($"Syntax error while parsing conditional namespace expression {attr.Value}");
}
return(elements[0] == nameof(ApiInformation.IsApiContractPresent) ?
ApiInformation.IsApiContractPresent(elements[1], majorVersion) :
ApiInformation.IsApiContractNotPresent(elements[1], majorVersion));
default:
return(null); // TODO: support IsTypePresent and IsPropertyPresent
}
}
}
return(included, excluded);
}
