public IEnumerable<TokenBlockBase> GetLines(BookTokenIterator bookTokens, string lastText, int firstTokenID,
int stopTokenID = -1, string stopText = null)
{
_firstTokenID = firstTokenID;
_tree = bookTokens.BuildTree(_firstTokenID);
_lastOpenTag = _tree.Peek();
_fontSize = GetCurrentFontSize();
_separator = false;
bool firstText = true;
_marginLeft = _marginRight = 0.0;
foreach (TagOpenToken openTagToken in _tree.Reverse())
EnterMargin(openTagToken.TextProperties);
if (string.IsNullOrEmpty(stopText) && stopTokenID > 0)
--stopTokenID;
while (bookTokens.MoveNext())
{
foreach (TokenBlockBase baseTokenLine in OutputLines(false))
yield return baseTokenLine;
if (!Append(bookTokens, lastText, stopTokenID, stopText, ref firstText))
break;
}
foreach (TokenBlockBase baseTokenLine in OutputLines(true))
yield return baseTokenLine;
}
private void PopTag()
{
_tree.Pop();
_lastOpenTag = _tree.Peek();
_fontSize = GetCurrentFontSize();
}
private void AppendToLine(TagOpenToken token)
{
if (!token.TextProperties.Inline)
{
if (_block != null)
{
_block.EndParagraph();
_firstTokenID = token.ID;
_output.Enqueue(_block);
}
EnterMargin(token.TextProperties);
_block = null;
_textWidth = _textIndent = token.TextProperties.TextIndent;
_separator = false;
}
PushTag(token);
}
private void PushTag(TagOpenToken tag)
{
_tree.Push(tag);
_lastOpenTag = tag;
_fontSize = GetCurrentFontSize();
}
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);
}
}
}
