Hi Lars! On Sat, Dec 10, 2011 at 11:32 PM, <lars.kn...@nokia.com> wrote: > there were quite a few discussions and requests over the last months to > add Json support as part of QtCore, and maybe integrating one of the > existing parsers.
There were also discussions and even a couple of bug report about adding "native" (a'la making Json first class citizen) support to QML as well (I guess this means adding it to the QDeclerativeContext engine?) , in favor of having one implementation that'd be standard and fast - https://bugreports.qt.nokia.com/browse/QTBUG-12117 . > > I was however never really happy with them. Mainly because they all parse > into a QVariant(Map), and don't offer any real API to create and modify > Json. In addition, I believed that it was possible to create a faster > parser, and wanted to have a binary representation for the parsed Json. > I wonder if the QML implementation in the bug report would suffer from the same (or perhaps worse?) performance issues? > So I sat down over the last weeks and implemented hacked on something on > my own. You can see the current state in our first playground project that > Sergio created for me yesterday. You can clone it from > ssh://usern...@codereview.qt-project.org:29418/playground/qtbinaryjson.git > So, could be bind this to have an QML "native" JSON implementation and handling? Perhaps also to tie it in to have a JsonModel just as the XmlListModel uses XML? > Things look rather promising, and I consider the code to be mostly feature > complete. There's work to be done on the API, and documentation is still > completely missing, but most of the other pieces are there. > /me keen to find a spare weekend to check this out. > What I have right now: > > * A binary representation of Json, that can be simply mmap'ed from a file, > or copied around. This gives us an extremely cheap way to load and save > Json objects in binary form. Would this enable us to store complete binary chunks (files, network dumps etc..) as BSON allows? I have some use cases for this if this is possible. > > The binary representation is optimized for fast reading. The binary format > is relatively compact and stores the whole object in one blob. Is this a standard binary format of JSON, or something of your own devise? > There's a bit of work still required to finish it, but I would like to > start the discussion about including it into QtCore anyways. I'd also be > happy about any feedback. Many thanks for this! -Sivan _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
