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Full Discussion: Valid input compared with input
Top Forums Shell Programming and Scripting Valid input compared with input Post 302437519 by ckozler on Thursday 15th of July 2010 09:29:24 AM
Old 07-15-2010
Valid input compared with input
Hi everyone,

I cant seem to figure this out for the life of me. Basically, I have two arrays..

Code:
sub init {
        use Getopt::Long;
        use Data::Dumper;
        my @selections = ();
        my @valid_options = ( "vaild1", "valid2" );
        GetOptions( "input=s" => \@selections );
        
        #
        # Loop input and compare against valid options storing invalid options
        #       
}

So as you can see from the above code, I take in input from the user in the command line as --input and want to compare it against valid/supported options.

For example, if they input --input=valid1 --input=valid3 --input=valid2 then it will tell them "valid3 is not a supported option". I have tried embedded loops (for/foreach/etc) and comparing -- as such:

Code:
for my $i( @selections ) { 
        for my $j( @valid_options ) {
                if( $i ne $j ) { print "not valid ( $i = $j)"; exit; }
        }
}

The above is only an example and I have tried many many many different ways but it seems the caveat is that I need to loop the entire array of inputs first and only erroring if no match at all was found-- this does not satisfy me as I would like to tell the user what they have inputted is wrong and which value exactly is wrong.

In short, I want to validate a users input in comparison with what I dictate as valid options-- the current logic I have tried time and time again does not seem to work as expected because it is simply doing a not equal check which occasionally fails because it is still hitting a valid option BUT just because the two strings do not equal each other, it errors out. This is not what I want.


I hope I have made my problem clear.

EDIT: I understand that I could make this very easy for myself by using static checks but I want to make it all dynamic. For instance, if I want to add another valid input, all I do is append it to the array rather than having to go through the code and add a separate block of code (eg: if( $input == "valid3" ) { __...do this...__; } )

For example-- I do not want to have to do this:

Code:
foreach my $input( @selections ) { 
        $input = lc( $input );
        if( $input ne "valid1" and $input ne "valid2" ) { print( "Unsupported ($input)" ); }
        if( $input eq "valid1" ) { print( "Doing action for valid1" ); }
        # etc...
}

Removes the dynamics of it.
Last edited by ckozler; 07-15-2010 at 10:41 AM..
 

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LEARN ABOUT DEBIAN

bup-margin

bup-margin(1)						      General Commands Manual						     bup-margin(1)

NAME

       bup-margin - figure out your deduplication safety margin

SYNOPSIS

       bup margin [options...]

DESCRIPTION

       bup margin  iterates  through  all  objects  in	your  bup repository, calculating the largest number of prefix bits shared between any two
       entries.  This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.

       For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45.  That  means  a  46-bit
       hash  would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
       its first 46 bits.

       The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects.  Since SHA-1 hashes have 160 bits,
       that  leaves 115 bits of margin.  Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
       with far fewer objects.

       If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see	if
       you're getting dangerously close to 160 bits.

OPTIONS

       --predict
	      Guess  the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
	      from the guess.  This is potentially useful for tuning an interpolation search algorithm.

       --ignore-midx
	      don't use .midx files, use only .idx files.  This is only really useful when used with --predict.

EXAMPLE

	      $ bup margin
	      Reading indexes: 100.00% (1612581/1612581), done.
	      40
	      40 matching prefix bits
	      1.94 bits per doubling
	      120 bits (61.86 doublings) remaining
	      4.19338e+18 times larger is possible

	      Everyone on earth could have 625878182 data sets
	      like yours, all in one repository, and we would
	      expect 1 object collision.

	      $ bup margin --predict
	      PackIdxList: using 1 index.
	      Reading indexes: 100.00% (1612581/1612581), done.
	      915 of 1612581 (0.057%)

SEE ALSO

       bup-midx(1), bup-save(1)

BUP

       Part of the bup(1) suite.

AUTHORS

       Avery Pennarun <apenwarr@gmail.com>.

Bup unknown-															     bup-margin(1)
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