igormironchik
commented
1 year ago Hello.
You can parse text from QTextStream, so you don't need to give an existing file. You can store Markdown text as you need in memory and use alternative method to parse from stream:
//! \return Parsed Markdown document.
std::shared_ptr< Document< Trait > > parse(
//! Stream to parse.
typename Trait::TextStream & stream,
//! This argument needed only for anchor.
const typename Trait::String & fileName );As shown in example:
for( auto it = doc->items().cbegin(), last = doc->items().cend(); it != last; ++it )
{
switch( (*it)->type() )
{
case MD::ItemType::Anchor :
{
auto a = static_cast< MD::Anchor< MD::QStringTrait >* > ( it->get() );
qDebug() << a->label();
}
break;
default :
break;
}
}You need to handle all possible types in this switch statement, and keep in mind that, for example, MD::List is an aggregate item, that contains other items, and you should loop through them and handle possible types there. As an example of handling MD::Document with all possible features, with except of raw HTML, you can have a look at my render of Markdown to PDF: https://github.com/igormironchik/md-pdf/blob/master/md-pdf/renderer.cpp
Your interest is only traversing through the MD::Document, start learning from this line:
https://github.com/igormironchik/md-pdf/blob/b9129ab78c0f18cbcb4c30ea8c5ecca8edd1786c/md-pdf/renderer.cpp#L658
You only need to wrap text in HTML tags, combine QString with entire HTML document and ate this string to Qt's Web Engine to render.
During iterating through MD::Document you just combine QString with ready HTML code. Rendering to HTML is quite easy, just handle carefully all possible types during traversing through the MD::Document.
You don't need to save HTML file, as said, prepare in memory one QString, and give it to Qt to render HTML.
Good luck.
Light-Wizzard
Looking at your example it seems I need to cast to get the information in the iterator (it) you use, would I also need to make a case for each type?
There must be a better way, but I did not figure it out.
I want to use this in a Qt Desktop C++ Widget App, in an editor, so I want to pass in the text and not the file name and return the text, I started off by using the Qt example for the Markdown editor, but it is way too slow, it uses JavaScript.
Most code I have seen only deals with files, which means I have to save the file, every time I enter a character so that I can update the HTML previewer, which is a Web Engine Widget, so I will have to write a wrapper around them to deal with this issue because this makes the editor GUI slow, plus the hourglass for saves, so I need figure out a better solution, and why I am looking at your code instead of C, only thing is your example does not help me much.
The App I am working on is at https://github.com/Light-Wizzard/QtWidgetCpackInstaller, the app is just an Editor, and the focus is on deploying this application using cmake, cpack, and NSIS, in this case, I want to use your parser to keep this a Qt example application for deploying Web Engine enabled apps.
The Qt Web Engine Widget Markdown editor uses a JavaScript implementation that is too slow, I would have to figure out how to replace that parser with yours, to know how much faster it is, my guess is that it will be fast enough.
Thanks for any help.