Snap! Team development discussion, vol. 2

dawidkrainski

Look here

bharvey

dawidkrainski wrote:
Look here

I made a comment on github…

liam48D

On the topic of the “arguments” block.. how did I not know about this?

This shows a list containing just 5:

run ({
  say (arguments)
} @addInput :: grey ring) with inputs [5] @delInput @addInput :: control

This throws an error (arguments variable does not exist in this context):

run ({
  say (arguments)
} @addInput :: grey ring) @addInput :: control

I don't think that should throw an error, in my opinion.

This throws the same error:

run ({
  say (arguments)
} input names: (name) @delInput @addInput :: grey ring) with inputs: [foo] @delInput @addInput :: control

Which is also kind of strange – e.g. if I were to do this:

({
  if <<(length of (arguments) :: lists) = [0]> or <not <is (name) a [string v] ? :: operators>>> then
    throw [Expected name (string) as first argument] :: control cap
  end
} input names: (name) :: grey ring)

Hopefully that fits in the post completely..

..I'd get an error. Instead I have to do this:

({
  script variables (name) @delInput @addInput :: grey
  if <(length of (arguments) :: lists) = [0]> then
    throw [Expected name (string) as first argument] :: control cap
  end
  set [name v] to (item (1 v) of (arguments))
  if <not <is (name) a [string v] ? :: operators>> then
    throw [Expected name (string) as first argument] :: control cap
  end
} input names: (name) :: grey ring)

And finally, it only works with lambdas. I suppose that makes sense though, as lambdas are really the only place where you could have a variable number of inputs.

202e-202e-202e-202e-202e UNI-CODE~~~~~

dawidkrainski

I think it easy to fix. Give me a moment.

dawidkrainski

Done, but you have to not use context parameters.
For example:

XXX
run ({say (arguments)
say (a)} input names: (a)(b)(c) @delInput@addInput::ring grey) with inputs: [1] [2] [3]::control

^^^::operators
run ({let (a^) be (item (1) of (arguments))::grey
say (arguments)
say (a)} input names: (a)(b)(c) @delInput@addInput::ring grey) with inputs: [1] [2] [3]::control

Last edited by dawidkrainski (Oct. 1, 2016 09:20:26)

bharvey

I'm so confused. Are you guys declaring a global variable arguments? (And if not how did you make the orange oval?)

Why is Liam making a script variable with the same name as his formal parameter?

And what does Dawid mean by “context parameters”?

And finally, what problem is this solving? Seems to me that instead of this kludge what you really want is to be able to declare an input to a lambda as being multiple, so you can say the equivalent of (lambda args …).

dawidkrainski

This line.
By “context parameters” i mean this:

({} input names: (a)(b)(ctx params) @delInput@addInput::ring grey)

Last edited by dawidkrainski (Oct. 1, 2016 09:21:33)

bharvey

dawidkrainski wrote:
This line.
By “context parameters” i mean this:
({} (a)(b)(ctx params)::ring grey)

Oh. I see. If it were me, I'd much rather that when you click on a formal parameter of a lambda, the little rename box had the arrowhead you could click to turn it into the long form input dialog, with the types and bells and whistles, or at least a checkbox for variadic.

Jonathan50

liam48D wrote:
On the topic of the “arguments” block.. how did I not know about this?

There's an “arguments” block!?

This throws an error (arguments variable does not exist in this context):

That happened to me when I tried to pass no arguments to a block like

((foo @addInput :: grey) @addInput)

Not yet a Knight of the Mu Calculus.

Jonathan50

Oh, ARGUMENTS is a Snap! variable that is implicitly bound when a procedure is called with more than zero arguments.

Why is it implicit? It means that stuff like

don't work as expected (it outputs “baz baz” instead of “baz bar”).

Not yet a Knight of the Mu Calculus.

dawidkrainski

Arguments variable is replaced by evaluate function. Look @up.

dawidkrainski

Try to use this:

(call ({([] in front of (arguments)::list)} @addInput::ring grey) with inputs: [a] [b] [c]::control)

without declaring arguments variable

Last edited by dawidkrainski (Oct. 1, 2016 09:22:28)

Jonathan50

If I set a variable watcher to a sequence of one or more spaces the watcher displays “0”.

Not yet a Knight of the Mu Calculus.

bharvey

Jonathan50 wrote:
If I set a variable watcher to a sequence of one or more spaces the watcher displays “0”.

Yeah, I think there's an open issue about this in Github.

dawidkrainski

Hi, my new tool! Block Factory!
It's only prototype, but I think, I done it tomorrow.
To activate, just use

BlockFactoryMorph.openIn(world);

Link

Planned features:

Export block to JSON file
Make it secure (for now, if done, it can replace e.g. reportJSFunction)

P.S. I'm working on it whole day.

Last edited by dawidkrainski (Oct. 1, 2016 20:08:21)

bharvey

dawidkrainski wrote:
Block Factory!

So, the point of this is to avoid having to make a Snap! block that does CALL (JSFunction…)?

I'd rather have a block that takes a spec, color, shape, and script, and registers the new block without user interaction. I'd use that often!

dawidkrainski

It can help to register “native” blocks without doing this steps:

Register block to SpriteMorph.prototype.blocks
make function in Process.prototype.<selector>
and add it to blockTemplates

and easy load it next time

bharvey

dawidkrainski wrote:
It can help to register “native” blocks without[…]

I guess the question I'm asking is why registering a native block is better than wrapping a Snap! custom block around it, e.g., as in the RGB library.

I mean, I see why it's a terrific exercise to practice doing things in Morphic! I don't mean to insult your work. Just trying selfishly to figure out if it's useful for me.

liam48D

Just ran into this..

Cubeupload is dead and tinypic is also dead :(

EDIT: Here's the project, if anyone's curious.

Last edited by liam48D (Oct. 3, 2016 20:07:07)

202e-202e-202e-202e-202e UNI-CODE~~~~~

-stache-

liam48D wrote:
EDIT: Here's the project, if anyone's curious.

Oh you already made that

Last edited by -stache- (Oct. 3, 2016 20:20:25)

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