public static TokenBase Load(BinaryReader reader, int id)
{
var type = (TokenType)reader.ReadByte();
switch (type)
{
case TokenType.TagOpenToken:
return(TagOpenToken.Load(reader, id));
case TokenType.TagCloseToken:
return(TagCloseToken.Load(reader, id));
case TokenType.TextToken:
return(TextToken.Load(reader, id));
case TokenType.WhitespaceToken:
return(new WhitespaceToken(id));
case TokenType.NewPageToken:
return(new NewPageToken(id));
case TokenType.PictureToken:
return(PictureToken.Load(reader, id));
default:
return(null);
}
}
private void AppendToLine(PictureToken token)
{
var imageTokenBlock = new ImageTokenBlock
{
ImageID = token.ImageID,
FirstTokenID = _firstTokenID,
LastTokenID = token.ID
};
_output.Enqueue(imageTokenBlock);
_firstTokenID = token.ID + 1;
}
private IEnumerable<TokenBase> ParseNodes(XContainer container, Stack<TextVisualProperties> propertiesStack, TokenIndex top, int bookLevel, int parentID = -1)
{
foreach (XNode node in container.Nodes())
{
var text = node as XText;
if ((text != null) && !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);
yield return tagOpen;
propertiesStack.Push(properties);
foreach (TokenBase token in ParseNodes(element, propertiesStack, top, level, tagOpen.ID))
{
yield return token;
}
propertiesStack.Pop();
yield return new TagCloseToken(top.Index++, parentID);
}
}
}
private IEnumerable<TokenBase> ParseNodes(HtmlNode container, Stack<TextVisualProperties> propertiesStack, TokenIndex top, EpubPath path, int parentID = -1)
{
foreach (HtmlNode child in container.ChildNodes)
{
var asText = child as HtmlTextNode;
if (asText != null && !string.IsNullOrEmpty(asText.Text))
{
foreach (TokenBase text in ParseText(asText.Text, top))
{
yield return text;
}
}
else
{
TextVisualProperties properties = propertiesStack.Peek().Clone().Update(child, _css);
properties.LinkID = string.Empty;
if (child.Name == "a" || child.Name == "span")
{
ParseAnchors(top, path, child);
}
if (child.Name == "a")
{
string href = child.GetAttributeValue("href", string.Empty);
if (!string.IsNullOrEmpty(href))
{
if (href.StartsWith("#"))
{
properties.LinkID = path.CurrentFilePath + href;
}
else
{
properties.LinkID = path + href;
}
}
}
if (string.Equals(child.Name, "img"))
{
HtmlAttributeCollection attributes = child.Attributes;
string src = attributes.Contains("src") ? attributes["src"].Value : string.Empty;
var pictureToken = new PictureToken(top.Index++, (path) + src);
yield return pictureToken;
}
else
{
if(child is HtmlCommentNode)
continue;
var tagOpenToken = new TagOpenToken(top.Index++, child, properties, parentID);
yield return tagOpenToken;
propertiesStack.Push(properties);
foreach (TokenBase token in ParseNodes(child, propertiesStack, top, path, tagOpenToken.ID))
{
yield return token;
}
propertiesStack.Pop();
yield return new TagCloseToken(top.Index++, parentID);
}
}
}
}