How to iterate through each character in symbol

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Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 10 Jan 2006, 19:04

OK, so I'm the wierd guy with new directives Smile

I actually ran into a problem with a little macro, I want to be able to iterate through a symbol.. get each character in the symbol separately. Like:

Code:

define _symbol cso

and iterate trough each character in this symbol, like:

Code:

irpc x, _symbol
{
  match =c, x \{ ... \}
  match =s, x \{ ... \}
  ; or anything else, using x as character
}

First iteration will be x=c, second x=s and third x=o.. something like irps, but iterates through a given symbol's characters.

If this is possible via macro it will be great, but I can't find a way to do it.
I know a new directive will not be a good idea, but...

10 Jan 2006, 19:04

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 10 Jan 2006, 19:43

tell whole problem, new directives really are not needed.

10 Jan 2006, 19:43

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 10 Jan 2006, 19:51

It's not really a program, but a macro... it accepts a parameter which are some 'flag' characters (at least for now, just playin' around a bit):

Code:

flg cso

will give some information to another macro (that one has no problemo Wink

) for the carry flag, the sign flag and the overflow flag...

I know, using another syntax:

Code:

flg c s o

will work with irps but I might want to make 'advanced' use of this technique maybe sometime later. (and the second syntax is a bit unclear, if you ask me)

The main reason is because you can also do:

Code:

flg sco

which does the same thing.

If this irpc or whatever works without new directive (via macro or whatever) it would be great.

another example would be that I posted:

Code:

ah equ a h
al equ a l
...

sure, Tomasz posted a new way for that macro (thanks again Smile

), but this split might still be useful in other macros (mainly syntax-oriented macros Very Happy

). Sure I don't need that split right now, but it may be useful.

Thanks.. any reply appreciated Very Happy

10 Jan 2006, 19:51

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8395
Location: Kraków, Poland

Tomasz Grysztar 10 Jan 2006, 20:06

But do you need it at preprocessing time? Maybe the assembler mechanism would be enough?

Code:

macro flg x
{
  virtual at 0
   db `x
   repeat $
    load c byte from %-1
    if c = 'c'
     display 'CF',13,10
    else if c = 's'
     display 'SF',13,10
    else if c = 'o'
     display 'OF',13,10
    end if
   end repeat
  end virtual
}

10 Jan 2006, 20:06

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 10 Jan 2006, 20:12

Maybe, I can't say for sure.. this macro is just a toy now, so i can't be sure.. I think I'll need a bit in preprocessor (if I can't find a way 'till then Smile

).

Interesting macro you posted.. Didn't know virtual can be so powerful. I understand it better now. Wink

Just wanted to know if this can be done in preprocessor with current directives. dunno, maybe some macros? It's mainly some syntax-adjustment

Thanks

10 Jan 2006, 20:12

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 10 Jan 2006, 21:31

cannot be done with current preprocessor (only in theory), there is no way to alter preprocessor's symbols right now. Symbol is entity for preprocessor.

10 Jan 2006, 21:31

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