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1 package Language::INTERCAL::Exporter;
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2
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3 # Like the standard Exporter, but understand INTERCAL (per)version numbers
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4
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5 # This file is part of CLC-INTERCAL
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6
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7 # Copyright (c) 2006-2008 Claudio Calvelli, all rights reserved.
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8
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9 # CLC-INTERCAL is copyrighted software. However, permission to use, modify,
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10 # and distribute it is granted provided that the conditions set out in the
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11 # licence agreement are met. See files README and COPYING in the distribution.
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12
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13 use strict;
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14 use vars qw($VERSION $PERVERSION);
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15 ($VERSION) = ($PERVERSION = "CLC-INTERCAL/Base INTERCAL/Exporter.pm 1.-94.-2") =~ /\s(\S+)$/;
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16
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17 use Carp;
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18 require Exporter;
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19 use vars qw(@EXPORT @EXPORT_OK);
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20 @EXPORT = qw(import);
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21 @EXPORT_OK = qw(is_intercal_number import require_version compare_version);
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22
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23 sub is_intercal_number {
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24 @_ == 1 or croak "Usage: is_intercal_number(STRING)";
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25 my ($s) = @_;
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26 $s =~ /^-?\d+(?:\.-?\d+)*$/;
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27 }
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28
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29 sub import {
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30 my $package = shift;
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31 if (@_ && Language::INTERCAL::Exporter::is_intercal_number($_[0])) {
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32 Language::INTERCAL::Exporter::require_version($package, shift);
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33 }
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34 unshift @_, $package;
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35 goto &Exporter::import;
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36 }
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37
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38 sub require_version {
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39 my ($package, $required) = @_;
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40 $package = caller if ! defined $package;
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41 no strict 'refs';
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42 my $provided = ((${"${package}::PERVERSION"} || '0') =~ /\s(\S+$)/)[0];
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43 compare_version($required, $provided) <= 0
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44 or croak "$package perversion $provided is too old (required $required)";
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45 }
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46
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47 sub compare_version {
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48 @_ == 2 or croak "Usage: compare_version(NUM, NUM)";
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49 my ($a, $b) = @_;
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50 my @a = split(/\./, $a);
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51 my @b = split(/\./, $b);
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52 while (@a || @b) {
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53 $a = @a ? shift @a : 0;
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54 $b = @b ? shift @b : 0;
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55 return -1 if $a < $b;
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56 return 1 if $a > $b;
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57 }
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58 0;
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59 }
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60
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61 1;
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