void TrimNodeOnStart(HtmlText textNode)
{
// If we need to decode entities
if (settings.DecodeEntityCharacters)
{
if (textNode.Slice.IndexOf('&') >= 0)
{
var text = textNode.Slice.ToString();
textNode.Slice = new StringSlice(EntityHelper.Unescape(text));
}
}
// If we don't do anything for TextNode, we can early exit
if (!settings.CollapseWhitespaces)
{
return;
}
// Find the first non-transparent parent
var parent = textNode.Parent;
while (parent != null && (parent.Descriptor == null || parent.Descriptor.Category == ContentKind.Transparent))
{
parent = parent.Parent;
}
if (!textNode.Slice.IsEmptyOrWhiteSpace() || (parent?.Descriptor != null && xmlNamespaceCount == 0))
{
pendingTexts.Add(textNode);
}
else
{
textNode.Remove();
}
}
private void TrimPendingTextNodes()
{
HtmlText previousTextNode = null;
for (int i = 0; i < pendingTexts.Count; i++)
{
var textNode = pendingTexts[i];
var previousElement = textNode.PreviousSibling as HtmlElement;
var nextElement = textNode.NextSibling as HtmlElement;
// We can trim the heading whitespaces if:
// - we don't have a previous element (either inline or parent container)
// - OR the previous element (sibling or parent) is not a tag that require preserving spaces around
// - OR the previous text node has already some trailing spaces
if ((previousTextNode == null || previousTextNode.Slice.HasTrailingSpaces()) && (previousElement == null || textNode.Slice.IsEmptyOrWhiteSpace()))
{
textNode.Slice.TrimStart();
}
// We can trim the traling whitespaces if:
// - we don't have a next element (either inline or parent container)
// - OR the next element (sibling or parent) is not a tag that require preserving spaces around
if (nextElement == null && previousTextNode != null && textNode.NextSibling == null && (i + 1 >= pendingTexts.Count || pendingTexts[i + 1].Slice.StartsBySpace()))
{
textNode.Slice.TrimEnd();
}
// If we are not in the context of a tag that doesn't accept to collapse whitespaces,
// we can collapse them for this text node
if (pendingTagNonCollapsibleWithSpaces == 0)
{
textNode.Slice.CollapseSpaces();
}
// If the text node is empty, remove it from the tree
if (textNode.Slice.IsEmpty())
{
textNode.Remove();
}
else
{
// Replace the previous textnode
previousTextNode = textNode;
}
}
// Trim any trailing spaces of the last known text node if we are moving to a block level
if (previousTextNode != null)
{
previousTextNode.Slice.TrimEnd();
if (previousTextNode.Slice.IsEmpty())
{
previousTextNode.Remove();
}
}
pendingTexts.Clear();
}
private void TrimPendingTextNodes()
{
if (pendingTagNonCollapsibleWithSpaces == 0)
{
HtmlText previousTextNode = null;
HtmlText firstTextNode = null;
for (int i = 0; i < pendingTexts.Count; i++)
{
var textNode = pendingTexts[i];
if (firstTextNode == null)
{
firstTextNode = textNode;
}
var previousElement = textNode.PreviousSibling as HtmlElement;
var nextElement = textNode.NextSibling as HtmlElement;
var isPreviousElementPreservingSpace = previousElement != null &&
settings.InlineTagsPreservingSpacesAround.ContainsKey(
previousElement.Name);
var isNextElementPreservingSpace = nextElement != null &&
settings.InlineTagsPreservingSpacesAround.ContainsKey(nextElement
.Name);
// If we expect to keep one space after collapsing
var isFirstText = textNode == firstTextNode;
var isLastText = i + 1 == pendingTexts.Count;
if (!settings.KeepOneSpaceWhenCollapsing || isFirstText || isLastText)
{
var isPreviousTrailing = previousTextNode != null && previousTextNode.Slice.HasTrailingSpaces();
var isNextStartsBySpace = i + 1 >= pendingTexts.Count ||
pendingTexts[i + 1].Slice.StartsBySpace();
// We can trim the heading whitespaces if:
// - we don't have a previous element (either inline or parent container)
// - OR the previous element (sibling or parent) is not a tag that require preserving spaces around
// - OR the previous text node has already some trailing spaces
if (!isPreviousElementPreservingSpace && (previousTextNode == null || isPreviousTrailing) &&
(previousElement == null || isFirstText))
{
textNode.Slice.TrimStart();
}
// We can trim the traling whitespaces if:
// - we don't have a next element (either inline or parent container)
// - OR the next element (sibling or parent) is not a tag that require preserving spaces around
if (!isNextElementPreservingSpace && isNextStartsBySpace)
{
textNode.Slice.TrimEnd();
}
}
// If we are not in the context of a tag that doesn't accept to collapse whitespaces,
// we can collapse them for this text node
textNode.Slice.CollapseSpaces();
// If the text node is empty, remove it from the tree
if (textNode.Slice.IsEmpty() || (textNode.Slice.IsEmptyOrWhiteSpace() &&
!isPreviousElementPreservingSpace &&
!isNextElementPreservingSpace))
{
textNode.Remove();
if (firstTextNode == textNode)
{
firstTextNode = null;
}
}
else
{
// Replace the previous textnode
previousTextNode = textNode;
}
}
// Trim any trailing spaces of the last known text node if we are moving to a block level
if (previousTextNode != null && previousTextNode.NextSibling == null)
{
previousTextNode.Slice.TrimEnd();
if (previousTextNode.Slice.IsEmpty())
{
previousTextNode.Remove();
}
}
}
pendingTexts.Clear();
}