Suggestions for command line parsing Post: 302825427

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Top Forums Shell Programming and Scripting Suggestions for command line parsing Post 302825427 by Fundix on Monday 24th of June 2013 11:53:15 AM

06-24-2013

Registered User

A Perl solution :

Code:

#!/usr/bin/perl -w
use strict;

my $cur_dir = $ENV{PWD};
my ($value,@values,@chars,@sep,$i,@ext,$idx);
my ($startVal,$endVal,$secNegFlg);

@values=split(/,/,$ARGV[0]);

foreach $value (@values) {
  $idx++;
  @chars=split(//,$value);
  @sep=grep{ $_ eq "-" } @chars;

  #one or more (3 max) "-" found -> range format (xx-xx) detected
  # define starting and ending values of range
  if ($#sep >= 0) {
    # if 1st char is -, first number of range is negative
    if ($chars[0] eq "-") { ($startVal) = $value =~ m/^(-\d+)/ }
      else { ($startVal) = $value =~ m/^(\d+)/ } ;

    # if -- found, second number of range is negative
    ($secNegFlg) = $value =~ m/(--\d+)$/;
    if( defined($secNegFlg) ) {  ($endVal) = $value =~ m/(-\d+)$/ }
      else { ($endVal) = $value =~ m/(\d+)$/ } ;
  }

  # Printing stage
  if ($#sep >= 0) {
    if ($startVal > $endVal) {
      for($i=$startVal; $i>=$endVal; $i--) {
        print "$i";
        print "," if( $i > $endVal);
      }
    } else {
      for($i=$startVal; $i<=$endVal; $i++) {
        print "$i";
        print "," if( $i < $endVal);
      }
    }
    print "," if( $idx <= $#values);
  } else {
    print "$value";
    print "," if( $idx <= $#values);
  }
}

print "\n";

Output :

Code:

 %./file034.pl 1,3-5,10,15-17,20,-25--22,0--3,-2-2

1,3,4,5,10,15,16,17,20,-25,-24,-23,-22,0,-1,-2,-3,-2,-1,0,1,2

Fundix

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LEARN ABOUT BSD

strtok

STRTOK(3)						     Library Functions Manual							 STRTOK(3)

NAME

       strtok - string tokens

SYNOPSIS

       #include <string.h>

       char *
       strtok(str, sep)
       char *str;
       char *sep;

DESCRIPTION

       This interface is obsoleted by strsep(3).

       The  strtok() function is used to isolate sequential tokens in a null-terminated string, str .  These tokens are separated in the string by
       at least one of the characters in sep .	The first time that strtok() is called, str should be  specified;  subsequent  calls,  wishing	to
       obtain  further	tokens	from the same string, should pass a null pointer instead.  The separator string, sep , must be supplied each time,
       and may change between calls.

       The strtok() function returns a pointer to the beginning of each subsequent token in the string, after replacing the token  itself  with  a
       NUL character.  When no more tokens remain, a null pointer is returned.

SEE ALSO

       index(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3

STANDARDS

       The strtok() function conforms to ANSI C X3.159-1989 (``ANSI C'').

BUGS

       There is no way to get tokens from multiple strings simultaneously.

       The  System  V strtok(), if handed a string containing only delimiter characters, will not alter the next starting point, so that a call to
       strtok() with a different (or empty) delimiter string may return a non-NULL value.  Since this implementation always alters the next start-
       ing point, such a sequence of calls would always return NULL.

4.4 Berkeley Distribution					 January 12, 1996							 STRTOK(3)

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