private IEnumerable <IDiagnostic> MatchMinMaxOccurs([NotNull] Item item, [NotNull] ITextNode schemaTextNode, [NotNull, ItemNotNull] ITextNode[] schemaChildNodes, [NotNull, ItemNotNull] Item[] children)
{
foreach (var schemaChildNode in schemaChildNodes)
{
if (schemaChildNode.Key != "item")
{
throw new InvalidOperationException($"Unexpected node {schemaChildNode.Key} at {schemaChildNode.Snapshot.SourceFile.AbsoluteFileName} {schemaChildNode.TextSpan}");
}
// in references, the referring text node may overwrite the referred text nodes
var minOccurs = 0;
var maxOccurs = 0;
if (schemaChildNode.HasAttribute("minOccurs"))
{
minOccurs = int.Parse(schemaChildNode.GetAttributeValue("minOccurs", "0"));
}
if (schemaTextNode.HasAttribute("minOccurs"))
{
minOccurs = int.Parse(schemaTextNode.GetAttributeValue("minOccurs", "0"));
}
if (schemaChildNode.HasAttribute("maxOccurs"))
{
maxOccurs = int.Parse(schemaChildNode.GetAttributeValue("maxOccurs", "0"));
}
if (schemaTextNode.HasAttribute("maxOccurs"))
{
maxOccurs = int.Parse(schemaTextNode.GetAttributeValue("maxOccurs", "0"));
}
if (minOccurs <= 0 && maxOccurs <= 0)
{
continue;
}
var count = children.Count(child => IsMatch(child, schemaChildNode));
if (minOccurs > 0 && count < minOccurs)
{
yield return(Factory.Diagnostic(Msg.D1025, item.Snapshot.SourceFile.RelativeFileName, TraceHelper.GetTextNode(item).TextSpan, Severity.Error, $"Item {GetText(schemaChildNode)} must occur at least {minOccurs} times [ArchitectureSchema]"));
}
if (maxOccurs > 0 && count > maxOccurs)
{
yield return(Factory.Diagnostic(Msg.D1025, item.Snapshot.SourceFile.RelativeFileName, TraceHelper.GetTextNode(item).TextSpan, Severity.Error, $"Item {GetText(schemaChildNode)} must not occur more than {maxOccurs} times [ArchitectureSchema]"));
}
}
}
public static bool GetAttributeBool([NotNull] this ITextNode textNode, [NotNull] string attributeName, bool defaultValue = false)
{
if (!textNode.HasAttribute(attributeName))
{
return(defaultValue);
}
var value = textNode.GetAttributeValue(attributeName);
return(string.Equals(value, "true", StringComparison.OrdinalIgnoreCase));
}