[Qt-interest] Noob Alert! / confused about Qt Script / QSA / KJS / Lua / Python etc..

[Thiago Macieira]

Em Quinta-feira 22. Outubro 2009, às 07.52.37, Patrick escreveu:
> I am just learning QT and I am really just at an overview stage. There
> seems to be quite a few ways in which someone could extend their basic
> C++ code. Am I correct that QSA and KJS are now dead ends that are being
> replaced with Qt Script?

Correct.

QSA is a fork of an early version of KJS and was supplied to commercial 
customers during Qt 3 times. In the meantime, KJS evolved and was forked again 
by Apple, now being released as JavaScriptCore.

> If so is QT script ready for production use, it
> appears to be part of QT labs making me wonder if it is still beta
>  software?

It's not in labs. QtScript was released as a production version back in Qt 
4.3, about 2,5 years ago.

You may be confused about the recent news on QtScript's engine being merged 
with that of JavaScriptCore. In a turnaround of events, the engine that was 
written to replace QSA's engine (which was a fork of KJS) is being replaced 
with another fork of KJS.

> Could I also extend an application with Lua or Python and do the same
> sort of things without using Qt Script? There are bindings for each
> which makes me wonder if someone could build a hybrid C++/PyQt(or Lua
> etc..) App.  Are there benefits to each approach? I have been looking
> through the bindings page:
> 
> http://techbase.kde.org/Development/Languages
> 
> for some time but I can't seem to make out which approach is most
> popular. Sorry if this is an utterly stupid post, sometimes it is hard
> for me to ask a coherent question and find a way out of the dark when I
> am this confused-Patrick

Yes, you can extend any language with any other language, provided you have 
the bindings and access to the interpreter.

QtScript only provides a JavaScript interpreter. The bindings (which are in 
labs) are written in JS too.

PyQt and PySide are technically just bindings. They allow you to write a full 
application in Python, but not really interact with it from the C++ side.

KDE's Kross library is a full two-way support. It allows you to expose a set 
of Qt C++ objects to any number of languages (including JavaScript and Python) 
and extend them in those languages.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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