Coding in Livecode in the browser (with Emscripten)

David Bovill david at viral.academy
Fri Jul 17 10:57:15 EDT 2015


Yes - that's the point.

These other languages are available to run in a browser window via an
emulated terminal. It would be great to add Livecode to this list of
languages, whil ewe wait for the intricacies of event handling and GUI
rendering - we could have Livecode in a terminal (used in a teaching
scenario) - and as something which would create Javascript Libraries that
can be embedded in web pages.


On 17 July 2015 at 15:15, Fraser Gordon <fraser.gordon at livecode.com> wrote:

> That’s exactly what we’re doing — the LiveCode engine is compiled into
> JavaScript using Emscripten.
>
> Like those other languages, we’re not converting LiveCode Script to
> JavaScript directly; it is the engine that runs those languages that has
> been compiled to JavaScript.
>
> Fraser
>
>
> On 17 Jul 2015, at 14:35, David Bovill <david at viral.academy> wrote:
>
> > So what would it take for Livecode to join this set of languages, all
> > running in the browser, in an open source emulator:
> >
> >   - Python
> >   - Ruby
> >   - PHP
> >   - Sceme
> >   - Lua
> >   - Java
> >   - Lolcode
> >   - FORTH
> >   - Many others <http://repl.it/languages>
> >
> >
> > The languages are compiled down to Javascript using Emscripten and run
> > locally on you machine. So we should be able to do this with Livecode -
> or
> > Livecode server? Great for teaching.
> >
> > On 16 July 2015 at 13:20, David Bovill <david at viral.academy> wrote:
> >
> >> Thanks Kevin and Peter - its very useful to have a soft indication of
> the
> >> direction you are heading.
> >>
> >> So my understanding now is that Livecode Builder - being the robust
> >> strongly typed language that compilers like - lends to being something
> that
> >> could be run through the compiler chain you are creating to export
> >> Javascript. For instance a Livecode Builder library - would be the sort
> of
> >> thing that could be compiled into a Javascript library that would then
> be
> >> called by standard HTML5/Javascript on a web page. This would be the
> same
> >> as emsripten ports of other languages like perl -
> >> https://github.com/kripken/emscripten/wiki/Porting-Examples-and-Demos
> >>
> >> However as your priority is to create a full export of stacks to the
> web -
> >> creating a Livecode Builder library export tool chain is something that
> >> we'd need to do as a community project or wait :)
> >>
> >> The one thing I would like to understand is how you would expose
> >> interfaces to the resulting exported JS code - are there any links to
> how
> >> you would do this / any thoughts regarding how Livecode.js exports
> would do
> >> this? Here I can see how you can expose C functions:
> >>
> >>   -
> >>
> http://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html#calling-compiled-c-functions-from-javascript
> >>
> >> So my question would be how is this extended so that a handler in
> Livecode
> >> Builder is exposed?
> >>
> >>
> >> On 16 July 2015 at 12:02, Kevin Miller <kevin at livecode.com> wrote:
> >>
> >>> This is definitely an area we¹re looking at - its on the strategy list.
> >>> Just can¹t say yet whether it will be during the initial beta cycle or
> in
> >>> a v ³1.1² as it were. It will certainly be early in the evolution of
> this
> >>> technology.
> >>>
> >>> In terms of LCB, remember we designed that from the start to capable
> >>> (eventually) of compiling directly to JavaScript. That opens up the
> >>> possibility of doing some lighter weight HTML5 specific frameworks down
> >>> the line. Right now though as Peter said, the priority for the first
> >>> version is to get as much as possible of the platform we already have
> >>> working.
> >>>
> >>> Kind regards,
> >>>
> >>> Kevin
> >>>
> >>> Kevin Miller ~ kevin at livecode.com ~ http://www.livecode.com/
> >>> LiveCode: Everyone can create apps
> >>>
> >>>
> >>>
> >>>
> >>> On 16/07/2015 11:53, "Peter TB Brett" <peter.brett at livecode.com>
> wrote:
> >>>
> >>>> On 2015-07-16 11:05, David Bovill wrote:
> >>>>> Thanks Peter. What i am keen to get a grip on is how we can interface
> >>>>> Livecode exported Javascritp with existing Javascript in a web page.
> >>>>> Are we
> >>>>> going to be stuck with an isolated blob of all Livecode-Javascript
> in a
> >>>>> page? Or can I make Livecode-Javascript widget that talk to existing
> >>>>> pages?
> >>>>>
> >>>>> My thought would be if the core Livecode C++ engine has now been
> >>>>> refactored
> >>>>> so that the language element - separate from all the GUI and even
> >>>>> message
> >>>>> stuff - and that this bit was easy and fast to get exported - then
> that
> >>>>> would be what we need to create interface independent Javascript
> >>>>> libraries
> >>>>> - let's say a library that takes some JSON and exports some JSON with
> >>>>> the
> >>>>> webpage handling all the rest of the interactions?
> >>>>>
> >>>>> How well will these exported Livecode-Javascript apps play within a
> web
> >>>>> page - what sort of bi-directional communication is being looked at?
> >>>>
> >>>> Hi David,
> >>>>
> >>>> We're not actively working towards any of these things at the moment.
> >>>> *In principle*, they're all ideas that we'd love to get working!  In
> >>>> practice, at the moment we're just trying to get stacks to run
> properly,
> >>>> and we're going to think about branching out to these other exciting
> >>>> possibilities once we get towards that point.
> >>>>
> >>>> I'm personally quite keen on the idea of figuring out how to compile
> >>>> LiveCode Builder programs directly to JavaScript, for example!
> >>>>
> >>>> This is definitely the sort of thing that enthusiastic community
> members
> >>>> could play with, once we release the Community edition of HTML5
> support.
> >>>>
> >>>>                                       Peter
> >>>>
> >>>> --
> >>>> Dr Peter Brett <peter.brett at livecode.com>
> >>>> LiveCode Engine Development Team
> >>>>
> >>>>
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