Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

vargrep

by japhy (Canon)
on Mar 13, 2001 at 01:21 UTC ( #63960=sourcecode: print w/ replies, xml ) Need Help??

Category: Utility Scripts
Author/Contact Info Jeff japhy Pinyan
Description: A raw attempt at scanning a Perl program for specific variables. Results are usually good.
#!/usr/bin/perl -w

use strict;

@ARGV && shift =~ /^-([sahgc]+)$/ or die << "USAGE";
usage: $0 -[sahg] name1 name2 -- input

  -s     scalar
  -a     array
  -h     hash
  -g     glob (same as -sah)

  -c     suppress lines starting with a #

  nameN  symbol name
  input  file to search

USAGE

my %mode = map +($_, 1), split //, $1;
my (@vars,@matches,$format);

push @vars, shift while @ARGV and $ARGV[0] ne '--';
shift;

my $name = qr{ @{[ join('|', @vars) ]} }x;
my $scalar = qr{ \$ $name (?= [^\w\[\{] ) }x;
my $array = qr{ \@ $name (?= \W ) | \$ $name \[ }x;
my $hash = qr{ % $name (?= \W ) | [\@\$] $name \{ }x;
my $glob = qr{ [\$\@%*] $name (?= \W) }x;

my ($flen,$llen) = (0,0);

while (<>) {
  next if $mode{c} and /^\s*#/;
  if (  
    ($mode{g} and /$glob/) or
    ($mode{s} and /$scalar/) or
    ($mode{a} and /$array/) or
    ($mode{h} and /$hash/)
  ) {
    push @matches, [ $ARGV, $., $_ ];
    $flen = length($ARGV) if length($ARGV) > $flen;
    $llen = length($.) if length($.) > $llen;
  }
}

exit unless @matches;

$format =
  '@' . ('>' x ($flen - 1)) . ':' .
  '@' . ('#' x ($llen - 1)) . ':~' . 
  '^' . ('<' x (80 - $flen - $llen - 4)) .
  ' ' x ($flen + $llen + 3) . '^' . ('<' x (80 - $flen - $llen - 4)) .
+ "\n";

formline($format, $_->[0], $_->[1], $_->[2], $_->[2]) for @matches;

print $^A;

Comment on vargrep
Download Code

Back to Code Catacombs

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: sourcecode [id://63960]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others about the Monastery: (13)
As of 2015-07-01 19:21 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (17 votes), past polls