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package Scalar::Quote; |
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3
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our $VERSION = '0.26'; |
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5
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1
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1
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40333
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use 5.006; |
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1
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6
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1
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1
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use strict; |
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1
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1
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7
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1
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1
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use warnings; |
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5
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1
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7979
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require Exporter; |
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our @ISA = qw(Exporter); |
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our %EXPORT_TAGS = ( 'quote' => [ qw( quote quote_number quote_cut quote_start ) ], |
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'diff' => [ qw( str_diff str_diffix ) ], |
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'short' => [ qw( Q N S D ) ] ); |
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our @EXPORT_OK = (@{$EXPORT_TAGS{quote}}, |
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@{$EXPORT_TAGS{diff}}, |
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@{$EXPORT_TAGS{short}}); |
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our @EXPORT = qw(); |
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20
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# converts a char to its hex representation |
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sub char_to_hex ($ ) { |
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51253
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51253
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0
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54796
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my $c=ord(shift); |
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51253
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241594
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sprintf( ($c < 256 ? '\x%02x' : '\x{%x}'), $c); |
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} |
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26
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my %esc = ( "\n" => '\n', |
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"\t" => '\t', |
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"\r" => '\r', |
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"\\" => '\\\\', |
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"\a" => '\a', |
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"\b" => '\b', |
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"\f" => '\f' ); |
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34
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sub escape_char($ ) { |
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54755
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54755
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0
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77566
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my $char=shift; |
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54755
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100
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129801
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exists $esc{$char} ? $esc{$char} : char_to_hex($char) |
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} |
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39
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# converts unprintable chars to \x{XX} and also escapes '"' and '\' if |
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# required |
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sub Q ($ ) { |
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350
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350
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1
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119188
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my $s=shift; |
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350
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833
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defined $s or return 'undef'; |
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350
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1885
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if ($s=~s/([^!#&()*+,\-.\/0123456789:;<=>?ABCDEFGHIJKLMNOPQRSTUVWXYZ\[\]\^_`abcdefghijklmnopqrstuvwxyz{|}~ ])/escape_char($1)/ge) { |
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54755
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94947
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45
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350
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2823
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return qq("$s"); |
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} |
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0
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0
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return qq('$s'); |
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} |
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*quote=\&Q; |
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# compares two strings and returns the position where they start to be |
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# diferent, i.e diffix('good morning', 'good afternoon') == 5 |
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54
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sub str_diffix ($$) { |
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202
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202
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1
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1536
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my ($a, $b)=@_; |
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57
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202
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50
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3228
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$a='' unless defined $a; |
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202
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536
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$b='' unless defined $b; |
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60
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202
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414
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return -1 if $a eq $b; |
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# my $c; |
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# for (my $i=0;;$i++) { |
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# $c=substr($a,$i,1); |
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# return $i |
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# unless ( $c ne '' and $c eq substr($b,$i,1)); |
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# } |
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69
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202
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my $la = length $a; |
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202
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247
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my $lb = length $b; |
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72
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202
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100
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456
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my $min = $la < $lb ? $la : $lb; |
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74
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202
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1174
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my $c = substr($a, 0, $min) ^ substr($b, 0, $min); |
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202
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100
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3330
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if ($c =~ m/[^\0]/g) { |
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201
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1820
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return pos($c) - 1; |
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} |
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1
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8
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return $min; |
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} |
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# quote_cut($string, $start, $len), like substr() but adds a head and a tail |
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# to the substring reported how many chars have been left alone. It |
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# also escapes the string. |
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85
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sub quote_cut ($$$ ) { |
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200
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200
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1
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return 'undef' unless defined $_[0]; |
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200
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328
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my (undef, $start, $len)=@_; |
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200
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286
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my $end=length($_[0])-$len-$start; |
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200
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417
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if ($end<0) { |
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0
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0
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$start+=$end; |
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0
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0
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$end=0; |
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} |
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200
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50
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409
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if ($start<0) { |
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0
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0
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$start=0; |
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} |
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200
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535
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my $s=sprintf("[%d chars omitted]", $start); |
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200
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50
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586
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if (length $s>=$start) { |
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0
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0
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$len+=$start; |
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0
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0
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$start=0; |
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0
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0
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$s=''; |
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} |
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200
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361
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my $e=sprintf("[%d chars omitted]", $end); |
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200
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367
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if (length $e>=$end) { |
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0
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0
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$len+=$end; |
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0
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0
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$e=''; |
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} |
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200
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638
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quote($s.substr($_[0], $start, $len).$e); |
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} |
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110
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111
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# escape and quote string start operator, like Q but truncates the |
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# string if it is to long. |
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sub S ($;$ ) { |
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0
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0
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0
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1
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my $len=defined $_[1] ? $_[1] : 32; |
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0
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quote_cut ($_[0], 0, $len); |
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} |
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*quote_start=\&S; |
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119
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my $number_re=qr/^\s*[+-]?(?:\d+|\d*\.\d*)(?i:E[+-]?\d+)?\s*$/; |
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121
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# quote number |
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sub N ($ ) { |
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1
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1
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17
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no warnings; |
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1
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2
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1
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196
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124
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1
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if (defined $_[0]) { |
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0
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0
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if ($_[0]=~/$number_re/o) { |
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return sprintf("%f", $_[0]); |
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} |
128
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0
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return sprintf("%f (str: %s)", $_[0], S($_[0])); |
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} |
130
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'undef' |
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0
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0
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} |
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*quote_number=\&N; |
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134
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# D computes the difference between two strings. |
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sub D ($$;$$ ) { |
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1
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1
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6
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no warnings 'uninitialized'; |
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1
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3
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1
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149
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137
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100
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50
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100
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1
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853
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return () if $_[0] eq $_[1]; |
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139
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100
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50
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333
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my $len=defined $_[3] ? $_[3] : 32; |
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100
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50
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366
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my $start=(defined $_[2] ? $_[2] : -8) |
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+ str_diffix($_[0], $_[1]); |
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100
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301
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my $a=quote_cut($_[0], $start, $len); |
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100
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413
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my $b=quote_cut($_[1], $start, $len); |
144
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145
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100
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50
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844
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return ($a, $b) if (wantarray); |
146
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147
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{ |
148
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1
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1
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6
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no strict 'refs'; |
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1
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2
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1
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177
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0
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149
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0
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my $caller = caller; |
150
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0
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my $pa=$caller."::a"; |
151
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0
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my $pb=$caller."::b"; |
152
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0
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${$pa}=$a; |
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153
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0
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${$pb}=$b; |
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154
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} |
155
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0
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return 1; |
156
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} |
157
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*str_diff=\&D; |
158
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159
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160
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161
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162
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1; |
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__END__ |