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awk: don't print sub-arrays

 
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# 1  
Old 07-30-2012
awk: don't print sub-arrays
Hi !

I have this input:
Code:
12{11}{11110}{80}3456
{123}15{60}9876{8083}34

I try to work on individual numbers between braces.
3 possible cases (here I used colours to be clearer only):
- there is no "0" among the characters between braces: so we don't touch anything.
- there is a "0" among characters between braces, and the number of characters between braces is >2 ("0" included): e.g. {1110} needs to be written as ({111})%
- there is a "0" among characters between braces, and the number of characters between braces = 2 ("0" included): e.g. {10} needs to be written as 1%

From the input above, I should obtain this output:
Code:
12{11}({1111})%8%3456
{123}156%9876({883})%34

My first attempt was with this code, but I get the same as input:
Code:
BEGIN{FS=OFS=""}

{
	a = split($0,b,"{")
	
	for(i=1; i<=a; i++){
	    c = split(b[i],d,"}")
	    
	    for(j=1; j<=c; j++){
	    	e = split(d[j],f,"")
	    	
	    	if(d[j] ~ /0/ && e == 2){
	    		gsub(/0/,"",d[j])
	    		gsub(/$/,"%",d[j])
	    	}
	    	
	    	else if(d[j] ~ /0/ && e > 2){
	    		gsub(/^/,"({",d[j])
	    		gsub(/$/,"})%",d[j])
	    		gsub(/0/,"",d[j])
	    	}
	    	
	    	else if(d[j] !~ /0/){
	    		gsub(/^/,"{",d[j])
	    		gsub(/$/,"}",d[j])
	    	}
	    }
	}
}1

I expect to make some modifications after but i would like to understand why it doesn't print anything first.

Thanks for your help !
Last edited by beca123456; 07-30-2012 at 08:49 AM..
# 2  
Old 07-30-2012
Try this:
Code:
awk '{
while(match($0,/\{[^}]*\}/))
{
 inbraces=substr($0,RSTART,RLENGTH)
 if(index(inbraces,"0"))
 {
  if(RLENGTH==4)
  {
   gsub(/0/,"",inbraces);sub(/\{/,"",inbraces);sub(/\}/,"",inbraces)
   inbraces=inbraces "%"
   $0=substr($0,1,RSTART-1) inbraces substr($0,RSTART+RLENGTH)
  }
  else if(RLENGTH>4)
  {
   gsub(/0/,"",inbraces)
   $0 = substr($0,1,RSTART-1) "(" inbraces ")%" substr($0,RSTART+RLENGTH)
  }
 }
 sub(/\{/,"~")
 sub(/\}/,"!")
}
gsub(/~/,"{")
gsub(/!/,"}")
}1' infile

Could not go through your program. You may try this. Go through it and if any problems, let me know. Have assumed that the tilde and bang characters will never occur in your input.
# 3  
Old 07-30-2012
Thanks for your help Elixir !

Unfortunately it doesn't work, the output is the same as the input.

With the code I first posted, my question is how could I print after each if statements?
# 4  
Old 07-30-2012
You make modifications to variables, not $0. So your 1 prints $0, not those modifications. you'd need printf statements at the end of your for loop. for this, i'd use a while match on the substr, like elixir suggested.
This User Gave Thanks to neutronscott For This Post:
beca123456
# 5  
Old 07-31-2012
A much less efficient but not too complicated shell script alternative:
Code:
while IFS= read -r line; do
    printf '%s\n' "$line" |
    tr '{}' '\n\n' |
    sed 'n; /0/!s/.*/{&}/; /0/{/.../s/.*/({&})/; s/.*/&%/; s/0//g;}' |
    paste -sd '\0' -
done < file

Regards,
Alister
This User Gave Thanks to alister For This Post:
beca123456
 
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