Re: If this is a feature, it's a nasty one.

wouter Tue, 18 Mar 2003 04:03:42 -0800

Bug or feature? or: Don't I love the mechanics of expansion

* From: Victor Eijkhout * Subject: Bug or feature? or: Don't I love the mechanics of expansion * Date: Sun, 16 Mar 2003 17:42:18 -0800

This bug took me an hour or two to find. I don't think I like it.
on tt arg
  put arg
end tt
on t
  set the aaa of me to "a"
  put 1 into a
  send "tt" && the aaa of me to me
end t

---snip

Anyway, solution:

send "tt" && quote & the aaa of me & quote

------snip

on t arg1,arg2
  put arg1
end t
on tt
  set the aa of me to 3,4
  send "t" && the aa of me to me
end tt
(I guess, for clarity, another clause is could be added in the above definition.) -- Victor Eijkhout <[EMAIL PROTECTED]> tel: 865 974 9308 (W), 865 673 6998 (H), 865 974 8296 (F) http://www.cs.utk.edu/~eijkhout/ _______________________________________________

Hi Victor,

AFAICS it is all very consistent. No bug at all.

In the first handler :

on tt arg
  put arg
end tt

on t set the aaa of me to "a" ##### makes a custom property called "aaa" and the char "a" is put into it put 1 into a ##### a variable "a" is initiated with "1" send "tt" && the aaa of me to me ##### the send command resolves to send "tt" && "a" ##### In this case there is also a variable a which contains "1" so this variable is passed end t

if one uses :  send "tt" && quote & the aaa of me & quote
then the output is "a"

If "3,4" is put into a then the output of this handler is "3,4"

One can see that the params are resolved 1 time (hope I used the right expression as I am not a pro)

In the next case :

on t arg1,arg2
  put arg1
end t


on tt
  set the aa of me to 3,4
  send "t" && the aa of me to me
end tt

The custom property is set to "3,4" The send command is resolved to send "tt" && "3,4" which is as if passing 2 parameters If one replaces set the aa of me to "3,4" with set the aa of me to "3 - 4" then the send command resolves to send "tt" && "-1"

Try this :

on t arg1,arg2,arg3
  put arg1 && arg2 && arg3
end t


on tt
  set the aa of me to "a,b"
  put "3,4" into a
  send "t" && the aa of me to me
end tt

then the send command resolves to send "t" && "3,4,b"

If this is a feature, it's a nasty one.
    * From: Victor Eijkhout
    * Subject: If this is a feature, it's a nasty one.
* Date: Mon, 17 Mar 2003 15:22:12 -0800
In other words, I consider this a bug.
on mouseup
  send "t 1" to me
end mouseup
on t a
  set the a of me to "bar"
end t
Guess what property gets set on mouseup?

And what's worse, I don't see how I can hack my way around it, because <set the "a" of me> is illegal. Ok, take a different name for the parameter, but I want to use logical sounding names.

The above case :

on mouseup
  send "t 1" to me
end mouseup


on t a
  set the a of me to "bar"
end t

Here a custom property is created with the name contained in a. In this case if a custom property has a number as name or even a space as name then it can only be called by a variable containing the number or the space.

on t a
  set the a of me to "bar"
put the a of me ##### or    put 1 into b; put the b of me
end t

So as you can see it is rather consistent ( and if I'm wrong, shoot me :-)

Have a nice day,

WA

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Re: If this is a feature, it's a nasty one.

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