public override IEnumerable<TokenBase> GetTokens()
{
var propertiesStack = new Stack<TextVisualProperties>();
var item = new TextVisualProperties();
propertiesStack.Push(item);
var top = new TokenIndex();
return _root.Elements(_ns + "body").SelectMany(b => ParseNodes(b, propertiesStack, top, 0, "2"));
}
protected IEnumerable<TokenBase> ParseText(string text, TokenIndex top)
{
foreach (string word in text.BreakToWords())
{
if (string.IsNullOrEmpty(word))
yield return new WhitespaceToken(top.Index++);
else
yield return new TextToken(top.Index++, WebUtility.HtmlDecode(word));
}
}
private IEnumerable<TokenBase> ParseNodes(XContainer container, Stack<TextVisualProperties> propertiesStack, TokenIndex top, int bookLevel, string pointer, int parentID = -1)
{
var pointerIndex = 0;
foreach (XNode node in container.Nodes())
{
pointerIndex++;
var text = node as XText;
if (!string.IsNullOrEmpty(text?.Value))
{
foreach (TokenBase token in ParseText(text.Value, top))
{
yield return token;
}
}
var element = node as XElement;
if(element == null)
continue;
TextVisualProperties properties = propertiesStack.Peek().Clone().Update(element, _styleSheet);
string localName = element.Name.LocalName;
int level = bookLevel;
if (localName == "a")
{
ProcessLinks(properties, element);
}
ProcessAnchors(top, element);
if (localName == "section")
{
yield return new NewPageToken(top.Index++);
level++;
}
if (localName == "title")
{
ProcessTitleData(top, element, level);
}
if (localName == "image")
{
XAttribute hrefAttr = element.Attributes().FirstOrDefault(t => (t.Name.LocalName == "href"));
string href = ((hrefAttr != null) ? hrefAttr.Value : string.Empty).TrimStart('#');
var pictureToken = new PictureToken(top.Index++, href);
yield return pictureToken;
}
else
{
var tagOpen = new TagOpenToken(top.Index++, element, properties, parentID, pointer + @"/" + pointerIndex);
yield return tagOpen;
propertiesStack.Push(properties);
foreach (TokenBase token in ParseNodes(element, propertiesStack, top, level, pointer+@"/"+pointerIndex, tagOpen.ID))
{
yield return token;
}
propertiesStack.Pop();
yield return new TagCloseToken(top.Index++, parentID);
}
}
}
private void ProcessTitleData(TokenIndex top, XElement xelement, int bookLevel)
{
var item = new BookChapter
{
Level = bookLevel,
Title = GetText(xelement),
TokenID = top.Index
};
_chapters.Add(item);
}
private void ProcessAnchors(TokenIndex top, XElement xelement)
{
XAttribute attribute = xelement.Attributes().FirstOrDefault(t => (t.Name.LocalName == "id"));
if (attribute != null)
{
_anchors[attribute.Value] = top.Index;
}
}