/// <summary>
/// Determines if the schema should be represented as a SimpleContentExtension in the XSD.
/// </summary>
/// <param name="schema">The Json Schema to analyze.</param>
/// <returns>True if it should be represented as a SimpleContentExtension in the XSD; otherwise, false.</returns>
protected bool IsValidSimpleContentExtension(JsonSchema schema)
{
// Exclude schemas with groupings
if (schema.HasAnyOfKeywords(
typeof(AllOfKeyword),
typeof(OneOfKeyword),
typeof(AnyOfKeyword),
typeof(IfKeyword),
typeof(ThenKeyword),
typeof(ElseKeyword),
typeof(NotKeyword)))
{
return(false);
}
if (!schema.TryGetKeyword(out PropertiesKeyword properties))
{
return(false);
}
// One of the properties must be named value
if (!properties.Properties.TryGetValue("value", out var valuePropertySchema))
{
return(false);
}
// It must not be marked as attribute
if (valuePropertySchema.GetKeyword <XsdAttributeKeyword>()?.Value == true)
{
return(false);
}
// follow any $ref keywords to validate against the actual subschema
while (valuePropertySchema.TryGetKeyword(out RefKeyword reference))
{
valuePropertySchema = FollowReference(reference);
}
// And it must be a valid SimpleType or a reference to a valid SimpleType
if (!IsValidSimpleTypeOrSimpleTypeRestriction(valuePropertySchema))
{
return(false);
}
// All other properties must be attributes
var attributePropertiesCount = properties.Properties.Values.Count(prop =>
{
var typeSchema = prop;
// follow any $ref keywords to validate against the actual subschema
while (typeSchema.TryGetKeyword(out RefKeyword reference))
{
typeSchema = FollowReference(reference);
}
return(IsValidSimpleTypeOrSimpleTypeRestriction(typeSchema) &&
prop.HasKeyword <XsdAttributeKeyword>(kw => kw.Value));
});
if (attributePropertiesCount != (properties.Properties.Count - 1))
{
return(false);
}
return(true);
}
