1. bug match_from (att: Matt)
What is the expected output?
constant tx="Euphoria"
? match_from("ho",tx,-1)
? match_from("ho",tx,-9)
Regards,
Salix
2. Re: bug match_from (att: Matt)
- Posted by Salix <salix at ?reemail.hu>
Jul 25, 2007
-
Last edited Jul 26, 2007
Now that I have some more time I decided to write about the strange behaviour of
match_from(s1,s2,i2) and find_from(x,s,i2).
constant tx="Euphoria"
? find_from('h',tx,-8) -- I get 4
? find_from('h',tx,-9) -- I get 0
? match_from("ho",tx,-8) -- I get 4
? match_from("ho",tx,-9) -- I get error
-- Note: length(tx)=8
I know it is highly unexpected that somebody enters a negative number as i2 but
it happens.
(E.g. in a loop with an always changing i2 value.)
I don't speak C but something like this could be implemented
if i2<=0 then i2=1 end if
or
if i2<=0 then return -1 end if
Regards,
Salix
3. Re: bug match_from (att: Matt)
Salix wrote:
>
> Now that I have some more time I decided to write about the strange behaviour
> of match_from(s1,s2,i2) and find_from(x,s,i2).
>
> }}}
<eucode>
> constant tx="Euphoria"
> ? find_from('h',tx,-8) -- I get 4
> ? find_from('h',tx,-9) -- I get 0
> ? match_from("ho",tx,-8) -- I get 4
> ? match_from("ho",tx,-9) -- I get error
> -- Note: length(tx)=8
> </eucode>
{{{
>
> I know it is highly unexpected that somebody enters a negative number as i2
> but it happens.
> (E.g. in a loop with an always changing i2 value.)
>
> I don't speak C but something like this could be implemented
>
> }}}
<eucode>
> if i2<=0 then i2=1 end if
> </eucode>
{{{
>
> or
>
> }}}
<eucode>
> if i2<=0 then return -1 end if
> </eucode>
{{{
>
> Regards,
>
> Salix
Nooooooo!!!
It is extremely useful to request a find or match from a location defined using
the end of string as reference - like for seek(). So
find_from('h',tx,-8)=find_from('h',tx,8+1-8)=4: correct
find_from('h',tx,-9)=find_from('h',tx,8+1-9)=0: perhaps an error would be better
here, or 0 always when the starting point is not greater than zero. At the very
least, find_from() and match_from() should behave the same in that case, ie both
error out or both return 0.
CChris
