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# $Revision: #3 $$Date: 2005/08/31 $$Author: jd150722 $ |
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###################################################################### |
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# |
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# This program is Copyright 2003-2005 by Jeff Dutton. |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of either the GNU General Public License or the |
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# Perl Artistic License. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# If you do not have a copy of the GNU General Public License write to |
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# the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, |
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# MA 02139, USA. |
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###################################################################### |
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package Parse::RandGen::Literal; |
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require 5.006_001; |
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use Carp; |
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use Parse::RandGen qw($Debug); |
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use strict; |
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use vars qw(@ISA $ValidLiteralRE $Debug); |
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@ISA = ('Parse::RandGen::Condition'); |
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# This regular expression defines whether a given regexp condition is valid (i.e. can be understood by the Condition module) |
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# To be valid, the regexp must |
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$ValidLiteralRE = qr / |
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([\'\"]) # Match either a single- or double-quote delimiter |
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(?: [^\\\1] | \\. )+ # In the middle of the regexp, match either <1> a character that is not a backslash or the delimiter or <2> a backslash followed by any character |
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\1 # Match the original delimiter that was found |
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/x; |
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sub _newDerived { |
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my $self = shift or confess("%Error: Cannot call without a valid object!"); |
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my $type = ref($self); |
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my $elemRef = ref($self->element()); |
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(!$elemRef) or confess("%Error: $type has an element is a reference (ref=\"$elemRef\") instead of a literal scalar!"); |
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} |
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sub dump { |
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my $self = shift or confess("%Error: Cannot call without a valid object!"); |
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return ("'" . $self->element() . "'"); |
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} |
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sub pick { |
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my $self = shift or confess("%Error: Cannot call without a valid object!"); |
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my %args = ( match=>1, # Default is to pick matching data |
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@_ ); |
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my $val = $self->element(); # Reset to element before each attempt |
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my $keepTrying = 10; |
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my $length = length($self->element()); |
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confess "Literal length is 0! This should never be!\n" unless ($length); |
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my ($method, $char); |
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while (!$args{match} && $keepTrying-- && ($val eq $self->element())) { |
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$val = $self->element(); # Reset to element before each corruption attempt |
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$method = int(rand(4)); # Method of corruption |
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$char = int(rand($length)); # Which character |
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if ($method == 0) { |
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# Try changing the case of first character |
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substr($val, $char, 1) = lc(substr($val, $char, 1)); |
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substr($val, $char, 1) = uc(substr($val, $char, 1)) unless ($val ne $self->element()); |
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} elsif ($method == 1) { |
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# Randomly change the value of one of the characters |
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substr($val, $char, 1) = chr( (ord(substr($val, $char, 1)) + int(rand(256))) % 256 ); |
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} elsif ($method == 2) { |
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# Insert a random character into the literal |
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$char = int(rand($length+1)); # Where to insert character |
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substr($val, $char, 0) = int(rand(256)) # Insert random character |
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} else { |
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# Remove a character |
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substr($val, $char, 1) = ''; |
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} |
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} |
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my $elem = $self->element(); |
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if ($Debug) { |
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if ($args{match}) { |
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print ("Parse::RandGen::Literal($elem)::pick(match=>$args{match}) with value of ", $self->dumpVal($val), "\n"); |
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} else { |
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print ("Parse::RandGen::Literal($elem)::pick(match=>$args{match}, method=>$method, char=>$char) with value of ", $self->dumpVal($val), "\n"); |
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} |
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} |
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return ($val); |
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} |
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sub stripLiteral { |
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my $lit = shift; |
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$lit =~ s/([\'\"])(.+)\1/$2/; |
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return ($lit); |
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} |
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###################################################################### |
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#### Package return |
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1; |
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__END__ |