Pb matching trailing part of symbol starting with a dot '.'

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fabbel

Joined: 30 Oct 2012
Posts: 96

fabbel 05 Jan 2018, 17:14

Hello

Pls help little noobie struggling with fasm (not fasmg) macros...

Am having hard time trying to build macro to parse symbol starting with dot ('.') :
basically i wud like to pass param such as : .somelabel (note the leading dot .),
to some macro and strip out the leading dot internally to keep only the trailing part,
i.e. only 'somelabel'.
Can't find a way around this.

typ., e.g.:

----
macro dummy param {
match =.arg, param \{
arg equ foo
\}
}

dummy .somelabel
----

=> compiles but does not work : symbolic constant doesn't get defined

Desperate to find a way around this...
(i have tried a number of other alternatives .. with no more luck)

Would any of you experts out there pls kindly help me with this... ?
Tx

for ref. same thing using leading colon ':' i/o dot '.' works perfectly :
----
macro dummy param {
match =:arg, param \{
arg equ foo
\}
}

dummy :somelabel
----
=> this correctly define symbolic constant 'somelabel' with value = foo

Tx
Regards

05 Jan 2018, 17:14

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20632
Location: In your JS exploiting you and your system

revolution 05 Jan 2018, 22:58

The problem you have is that the dots are not special. They are simply part of the name. So just pretend that they are a normal letter in a label.

Code:

macro dummy param {
  match arg, param \{
    arg equ foo
  \}
}

05 Jan 2018, 22:58

fabbel

Joined: 30 Oct 2012
Posts: 96

fabbel 06 Jan 2018, 15:43

Tx but that doesnt answer my question : i am looking to get only the part following the dot. Is there no way around this?

06 Jan 2018, 15:43

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8400
Location: Kraków, Poland

Tomasz Grysztar 06 Jan 2018, 16:43

Because "." is not treated as a special character by fasm 1 and the preprocessor does not have an ability to split or alter the name tokens, it is not possible. It is one of the limitations that led to the design of the successor engine (fasmg).

06 Jan 2018, 16:43

a

Joined: 10 Apr 2025
Posts: 17
Location: Ukraine

a 10 Apr 2025, 10:27

Tomasz, although preprocessor does not have an ability to split or alter the name tokens, it is still possible to detect if the name starts with a dot:

Code:

macro check_if_name_starts_with_a_dot a
   {
   local b
   b:
   if b#a eq a
      the_first_character_is_a_dot
   else
      the_first_character_is_not_a_dot
   end if
   }

some people might find this to be helpful

10 Apr 2025, 10:27

Roman

Joined: 21 Apr 2012
Posts: 1939

Roman 10 Apr 2025, 10:34

And how using this macro ?
I try this:

Code:

macro namedot a
   {
   local b
   b:
   if b#a eq a
      display '1_character_is_a_dot'
   else
      display '2_character_is_not_a_dot'
   end if
   } 
Start:  
        namedot Start.aa ;get 2_character_is_not_a_dot
        namedot .aa      ;get 1_character_is_a_dot
        namedot aa       ;get 2_character_is_not_a_dot
.aa:

10 Apr 2025, 10:34

a

Joined: 10 Apr 2025
Posts: 17
Location: Ukraine

a 10 Apr 2025, 10:40

Roman,

Code:

check_if_name_starts_with_a_dot .wwwwwwwwwwwwwwwwwwwwwwwww

it will show the correct error: the_first_character_is_a_dot

Code:

check_if_name_starts_with_a_dot wwwwwwwwwwwwwwwwwwwwwwwww

it will show the correct error: the_first_character_is_not_a_dot

so you are supposed to replace the "the_first_character_is_a_dot" and "the_first_character_is_not_a_dot" with your custom code like you did.
also: it can only detect if it STARTS with a dot not if it HAS a dot

10 Apr 2025, 10:40

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