RFindString()

blueznl · Post by **blueznl** » Wed Oct 29, 2003 2:58 pm

search from the end of the string backwards...

equivalents in gfa: instr() and rinstr()

blueznl · Post by **blueznl** » Wed Oct 29, 2003 3:27 pm

oh well, let's simply code it for now...

Procedure.l x_countchar(string.s,char.s)
  Protected n.l , p.l , l.l
  ;
  ; *** counts occurances of character in string
  ;
  n.l = 0
  p.l = 0
  l.l = Len(string)
  While p < l
    INC p
    If Mid(string,p,1) = char
      INC n
    EndIf
  Wend
  ProcedureReturn n
EndProcedure
  
Procedure.l x_rfindstring(string.s,find.s)
  Protected l.l , p.l
  ;
  ; *** find a string in another string, starting from the right
  ;
  l.l = Len(find.s)
  p.l = Len(string.s)
  If l > 0 And p > 0
    p = p+l
    Repeat
      DEC p
    Until p.l = 0 Or Mid(string,p,l) = find
  EndIf
  ProcedureReturn p
EndProcedure

Psychophanta · Post by **Psychophanta** » Wed Oct 29, 2003 3:43 pm

Thanks
Just you have bring to my mind a new idea.

I'll make a function in assembler for to perform equivalents in gfa: rinstr().

I will name it: RFindString(). LFindString() already exists, its name is FindString()

And by the way you can find CountChars() and CountStrings() functions made by me in assembler in www.purearea.net.

You know, you could take it and make a PB userlibrary with all those 3 functions, will you be able to do?

Post by **Fred** » Wed Oct 29, 2003 5:12 pm

Psychophanta: may be you could use name less 'common' for your addon functions because some of them (especially CountString()) will be in a next version and it will invalidate your lib.. Just a tough.

bluenz: 'INC p' is assembly, right ? Why not: 'p+1' ?

Psychophanta · Post by **Psychophanta** » Wed Oct 29, 2003 5:18 pm

Ooookay

Note that i use CountStrings() not CountString()

blueznl · Post by **blueznl** » Wed Oct 29, 2003 10:31 pm

fred, that's an old habit of using gfabasic, it had the following basic commands:

inc a
a += 1
add a , 1

old habits are difficult to kill... will it affect code, as compared to a = a + 1?

psycho, are you sure your countstrings asm function works correctly? i tried it here and got the wrong answer...

currently i'm just dumping my functions in a file, and add x_ to every function name, so fred can update what he wants, and it won't cause me troubles

i always peek into the libraries to see what i can use, but often end up coding something myself... good excercise

but ehm... fred, will rfindstring also show up? or?

Post by **Fred** » Thu Oct 30, 2003 10:01 am

bluenz: I was just pointing out than 'p+1' is like 'p += 1' in C, so it seems shorter than INC p, why not use it. But it's up to you of course

blueznl · Post by **blueznl** » Thu Oct 30, 2003 10:53 am

readability, my dear man, readability... for some strange reason my mind can *see* basic code, yet perceives c(++) as something foggy, in other words: i have to look at basic to understand it, i have to puzzle to understand c... i have a similar thing with object oriented programming...

and inc c just *looks* better to me than c+=1 or c = c + 1

ah, forgot a variation, gfa also allowed c++

Saboteur · Post by **Saboteur** » Thu Oct 30, 2003 11:00 am

Fred wanted to say that it is not necesary write

Code: Select all

p = p+1

you can write simply

Code: Select all

p+1
p+5
p+100

blueznl · Post by **blueznl** » Thu Oct 30, 2003 11:01 am

ooops

Post by **Fred** » Fri Oct 31, 2003 12:24 pm

Do I speak english so badly ?

Psychophanta · Post by **Psychophanta** » Fri Oct 31, 2003 2:29 pm

Fred wrote:

Psychophanta: may be you could use name less 'common' for your addon functions because some of them (especially CountString()) will be in a next version and it will invalidate your lib.. Just a tough.

Don't worry, if i make a PB userlib, then i'll rename functions with a prefix, for example "al", but for normal Procedure names, user can name it as is wanted.

freedimension · Post by **freedimension** » Fri Oct 31, 2003 2:40 pm

Fred wrote:Do I speak english so badly ?

Yes, but you havn't heard me speaking french yet

blueznl · Post by **blueznl** » Fri Oct 31, 2003 3:16 pm

try dutch for a change

si tu veux, mon ami fred, c'est possible de continuer en francais, mais je te dit, ma connaisance de la langue francais... c'est... le mot propre c'est 'corrode' je pense?

damn, forgot most of my french, i've been working for one and a half year in paris, almost a decade back, and at that time it wasn't a problem at all... hell, i even started swearing at all those bloody foreigners behaving like tourists when using the peripherique

GeoTrail · Post by **GeoTrail** » Tue Jul 19, 2005 1:32 pm

I get an error saying p is not a valid operator.
I need to search for a specific character in a word and then search backwards to find the beginning of that word by finding the space infront of it.

Hmm did that make any sence? hehehe