/// <summary>
/// Does the location represent whitespace?
/// </summary>
/// <param name="location">
/// The XML location.
/// </param>
/// <param name="whitespace">
/// Receives the <see cref="XSWhitespace"/> (if any) at the location.
/// </param>
/// <returns>
/// <c>true</c>, if the location represents whitespace within element content; otherwise, <c>false</c>.
/// </returns>
public static bool IsWhitespace(this XmlLocation location, out XSWhitespace whitespace)
{
if (location == null)
{
throw new ArgumentNullException(nameof(location));
}
if (location.IsWhitespace())
{
whitespace = (XSWhitespace)location.Node;
return(true);
}
whitespace = null;
return(false);
}
/// <summary>
/// Find the spaces between elements and use that to infer whitespace.
/// </summary>
void ComputeWhitespace()
{
// TODO: Merge contiguous whitespace.
var discoveredElements = DiscoveredNodes.OfType <XSElementWithContent>()
.OrderBy(discoveredNode => discoveredNode.Range.Start)
.ThenBy(discoveredNode => discoveredNode.Range.End);
foreach (XSElementWithContent element in discoveredElements)
{
int startOfNextNode, endOfNode, whitespaceLength;
XSWhitespace whitespace;
endOfNode = element.ElementNode.StartTag.Span.End;
for (int contentIndex = 0; contentIndex < element.Content.Count; contentIndex++)
{
if (element.Content[contentIndex] is XSElementText text)
{
startOfNextNode = _textPositions.GetAbsolutePosition(text.Range.Start);
whitespaceLength = startOfNextNode - endOfNode;
if (whitespaceLength > 0)
{
whitespace = new XSWhitespace(
range: new Range(
start: _textPositions.GetPosition(endOfNode),
end: _textPositions.GetPosition(startOfNextNode)
),
parent: element
);
element.Content = element.Content.Insert(contentIndex, whitespace);
DiscoveredNodes.Add(whitespace);
}
endOfNode = _textPositions.GetAbsolutePosition(text.Range.End);
}
if (element.Content[contentIndex] is XSElement childElement)
{
startOfNextNode = childElement.ElementNode.Span.Start;
whitespaceLength = startOfNextNode - endOfNode;
if (whitespaceLength > 0)
{
whitespace = new XSWhitespace(
range: new Range(
start: _textPositions.GetPosition(endOfNode),
end: _textPositions.GetPosition(startOfNextNode)
),
parent: element
);
element.Content = element.Content.Insert(contentIndex, whitespace);
DiscoveredNodes.Add(whitespace);
}
endOfNode = childElement.ElementNode.Span.End;
}
}
// Any trailing whitespace before the closing tag?
startOfNextNode = element.ElementNode.EndTag.Span.Start;
whitespaceLength = startOfNextNode - endOfNode;
if (whitespaceLength > 0)
{
whitespace = new XSWhitespace(
range: new Range(
start: _textPositions.GetPosition(endOfNode),
end: _textPositions.GetPosition(startOfNextNode)
),
parent: element
);
element.Content = element.Content.Add(whitespace);
DiscoveredNodes.Add(whitespace);
}
}
}
