Colon implementation in SH

[laz0r]

I think something's wrong: when I do
CODE:
code here%54:

As I understand it, it ought to go left so what is executed is:
% []
5 [5]
4 [5,4]
: []
4 [4]
5 [4,5]
% [4,5]
e [4,5]
d [4,5] etc

What I actually get is it attempting to go up - is it that it turns 90 degrees left then? If so, could that be written into the instructions please?

[Karian]

the instructions aren't saying that you will go left, but that you turn left, and this is indeed a turn of 90 degrees. you can see it as a conditional '/' '\' or ' '. It is always relative to the direction you are going.
To be sure what a command is exactly doing, you can always check the php implementation, or experiment with the implementation.

[laz0r]

Thanks!

[laz0r]

New question (sorry!)

Code: Select all

         \
/ w15*48 /
\!

how will this work - does it put spaces in, line breaks etc, down to (5,1) in the code, or is there just this isolated space sitting at (5,1), surrounded by nothing, not even spaces?

[Karian]

I have no clue, and I don't see the use of what you are doing. Why would you want to change a code value that you aren't processing.
If you really want to know, you have ways to find this on yourself. 2 ways spring to mind:
1. You check the implementation of Superhack, and see how it is working. At the same time, you can increase your knowledge about php.
2. Maybe a bit easier, write a program where you try to execute the code value you just inserted, and see how it behaves. For this, I would certainly use the php implementation, if you want to be sure that the result is as expected when you try to use this in a challenge.

[laz0r]

This is just for the purpose of writing an interpreter - I want it to be able to cover things like this (Delphi will throw an access violation if I try to write somewhere which doesn't exist, but no such violation occurs in the PHP implementation). Thanks for the ideas - I couldn't find the PHP source (stupid given that there is a link at the top of the page )

[laz0r]

The implementation in PHP takes no-ops as being one cycle; the Javascript implementation just skips them out. Try the third example given:

Code: Select all

9&\0000@\!
  s  /\ @
 /\  || @
 p7  || @
 \/  || |
$====/\=/

The PHP one includes all the '=', '|' etc, while the JS one does not.

[Karian]

have you read the note that comes together with the JavaScript implementation?

[NOTE: the JavaScript version is just for casual experimentation on this page, it may not always behave exactly the same as the implementation used to judge the challenge submissions)

[laz0r]

Yes, I have (I just thought perhaps if a bug was found it might be fixed!)

[tails]

The example runs exactly the same way on both PHP and JS to me.
What difference do you have?
What do you mean by "include"?

[laz0r]

I'm sorry, I think I must be going bonkers at last - now they run the same. I could have sworn that the JS version just skipped out the no-ops whereas the PHP version included them as an operation (so a thread can be delayed with no-ops in the PHP but not in the JS)