private bool IsMatch(IQueryableNode node, AttributeRestriction elem)
{
string value;
if (node.TryGetAttributeValue(elem.Name, this.Comparison, out value))
{
switch (elem.Comparison)
{
case Selector.AttributeComparison.Contains:
return !string.IsNullOrEmpty(elem.Value) && value.IndexOf(elem.Value, this.Comparison) >= 0;
case Selector.AttributeComparison.EndsWith:
return !string.IsNullOrEmpty(elem.Value) && value.EndsWith(elem.Value, this.Comparison);
case Selector.AttributeComparison.Equals:
return string.Compare(value, elem.Value ?? "", this.Comparison) == 0;
case Selector.AttributeComparison.Exists:
return true;
case Selector.AttributeComparison.HyphenatedListStartsWith:
return string.IsNullOrEmpty(elem.Value) || string.Compare(value, elem.Value, this.Comparison) == 0 || value.StartsWith(elem.Value + '-', this.Comparison);
case Selector.AttributeComparison.NotEquals:
return string.Compare(value, elem.Value ?? "", this.Comparison) != 0;
case Selector.AttributeComparison.StartsWith:
return !string.IsNullOrEmpty(elem.Value) && value.StartsWith(elem.Value, this.Comparison);
case Selector.AttributeComparison.WhitespaceListContains:
return !string.IsNullOrEmpty(elem.Value) && value.Split(' ').Contains(elem.Value, GetComparer(this.Comparison));
}
}
return false;
}
public static AttributeRestriction Class(string className)
{
var result = new AttributeRestriction();
result.Name.LocalName = "class";
result.Comparison = AttributeComparison.WhitespaceListContains;
result.Value = className;
return result;
}
public void Visit(AttributeRestriction selector)
{
if (string.IsNullOrEmpty(selector.Name.Namespace) &&
string.Compare(selector.Name.LocalName, "id", StringComparison.OrdinalIgnoreCase) == 0 &&
selector.Comparison == AttributeComparison.Equals)
{
_writer.Write('#');
_writer.Write(selector.Value);
}
else if (string.IsNullOrEmpty(selector.Name.Namespace) &&
string.Compare(selector.Name.LocalName, "class", StringComparison.OrdinalIgnoreCase) == 0 &&
selector.Comparison == AttributeComparison.WhitespaceListContains)
{
_writer.Write('.');
_writer.Write(selector.Value);
}
else
{
_writer.Write('[');
if (!string.IsNullOrEmpty(selector.Name.Namespace))
{
_writer.Write(selector.Name.Prefix ?? selector.Name.Namespace);
_writer.Write('|');
}
_writer.Write(selector.Name.LocalName);
switch (selector.Comparison)
{
case AttributeComparison.Contains:
_writer.Write("*=");
break;
case AttributeComparison.EndsWith:
_writer.Write("$=");
break;
case AttributeComparison.Equals:
_writer.Write('=');
break;
case AttributeComparison.HyphenatedListStartsWith:
_writer.Write("|=");
break;
case AttributeComparison.StartsWith:
_writer.Write("^=");
break;
case AttributeComparison.WhitespaceListContains:
_writer.Write("~=");
break;
case AttributeComparison.NotEquals:
_writer.Write("!=");
break;
default: // AttributeComparison.Exists:
_writer.Write(']');
return;
}
_writer.Write('\"');
_writer.Write(selector.Value);
_writer.Write("\"]");
}
}
public static AttributeRestriction Id(string id)
{
var result = new AttributeRestriction();
result.Name.LocalName = "id";
result.Comparison = AttributeComparison.Equals;
result.Value = id;
result._idSpecificity = true;
return result;
}
public void Visit(AttributeRestriction selector)
{
this.Specificity += (selector.IdSpecificity ? (1 << 12) : (1 << 8));
}
public void Visit(AttributeRestriction selector)
{
_matches = _matches.Where(n => IsMatch(n, selector));
}
