strindexk

strindexk — Return the position of the first occurence of a string in another string

Description

Return the position of the first occurence of S2 in S1, or -1 if not found. If S2 is empty, 0 is returned. strindexk runs both at init and performance time.

Syntax

kpos strindexk S1, S2

Examples

Here is an example of the strindexk opcode. It uses the file strindexk.csd.

Example 851. Example of the strindexk opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac     ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o strindexk.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

seed 0

instr 1 
;get one element of the input string whenever the metro
;triggers, and call a subinstrument to play the file

Smember   strget    p4
istrlen   strlen    Smember
kprint    init      0
ktrig     metro     .5 

 ;whenever the trigger gives signal
 if ktrig == 1 then
  ;choose a random element (0, 1 or 2)
kel       random    0, 2.9999
kel       =         int(kel)
 ;make a copy for leaving Smember intact
Scopy     strcpyk   Smember 
 ;set the initial index for reading substrings
kndx      =         0 
 ;set counter for searching the element
kcount    =         0
 ;start looping over the elements in Smember
loop:
kdelim    strindexk Scopy, ":"
  ;as long as ":" occurs in Scopy, do:
  if kdelim > 0 then
   ;if this is the element to get
   if kel == kcount then
    ;read it as substring
Sfile     strsubk   Scopy, kndx, kdelim
kprint = kprint+1
    ;and jump out
          kgoto     call
   ;if not
   else
    ;cut off this element from Scopy
Scopy     strsubk   Scopy, kdelim+1, istrlen
   endif
   ;if no element has been found,go back to loop 
   ;and look for the next element
kcount    =         kcount+1
          kgoto     loop
  ;if there is no delimiter left, the rest is the searched element
  else
Sfile     strcpyk   Scopy
  endif
call:
 ;print the result, call the subinstrument and play the file
          printf    "kel = %d, file = '%s'\n", ktrig+kprint, kel, Sfile
S_call    sprintfk  {{i 2 0 1 "%s"}}, Sfile
          scoreline S_call, ktrig
 endif

endin

instr 2 ;play
Sfile     strget    p4
ilen      filelen   Sfile
p3        =         ilen
asig      soundin   Sfile
          outs      asig, asig
endin
</CsInstruments>
<CsScore>

i 1 0 30 "mary.wav:fox.wav:beats.wav"
e
</CsScore>
</CsoundSynthesizer>


See also

strindex

Credits

Author: Istvan Varga
2006

New in version 5.02