1 | package Text::Abbrev;
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2 | require 5.005; # Probably works on earlier versions too.
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3 | require Exporter;
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4 |
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5 | our $VERSION = '1.01';
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6 |
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7 | =head1 NAME
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8 |
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9 | abbrev - create an abbreviation table from a list
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10 |
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11 | =head1 SYNOPSIS
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12 |
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13 | use Text::Abbrev;
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14 | abbrev $hashref, LIST
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15 |
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16 |
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17 | =head1 DESCRIPTION
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18 |
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19 | Stores all unambiguous truncations of each element of LIST
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20 | as keys in the associative array referenced by C<$hashref>.
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21 | The values are the original list elements.
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22 |
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23 | =head1 EXAMPLE
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24 |
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25 | $hashref = abbrev qw(list edit send abort gripe);
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26 |
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27 | %hash = abbrev qw(list edit send abort gripe);
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28 |
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29 | abbrev $hashref, qw(list edit send abort gripe);
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30 |
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31 | abbrev(*hash, qw(list edit send abort gripe));
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32 |
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33 | =cut
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34 |
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35 | @ISA = qw(Exporter);
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36 | @EXPORT = qw(abbrev);
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37 |
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38 | # Usage:
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39 | # abbrev \%foo, LIST;
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40 | # ...
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41 | # $long = $foo{$short};
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42 |
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43 | sub abbrev {
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44 | my ($word, $hashref, $glob, %table, $returnvoid);
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45 |
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46 | @_ or return; # So we don't autovivify onto @_ and trigger warning
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47 | if (ref($_[0])) { # hash reference preferably
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48 | $hashref = shift;
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49 | $returnvoid = 1;
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50 | } elsif (ref \$_[0] eq 'GLOB') { # is actually a glob (deprecated)
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51 | $hashref = \%{shift()};
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52 | $returnvoid = 1;
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53 | }
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54 | %{$hashref} = ();
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55 |
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56 | WORD: foreach $word (@_) {
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57 | for (my $len = (length $word) - 1; $len > 0; --$len) {
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58 | my $abbrev = substr($word,0,$len);
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59 | my $seen = ++$table{$abbrev};
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60 | if ($seen == 1) { # We're the first word so far to have
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61 | # this abbreviation.
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62 | $hashref->{$abbrev} = $word;
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63 | } elsif ($seen == 2) { # We're the second word to have this
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64 | # abbreviation, so we can't use it.
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65 | delete $hashref->{$abbrev};
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66 | } else { # We're the third word to have this
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67 | # abbreviation, so skip to the next word.
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68 | next WORD;
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69 | }
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70 | }
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71 | }
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72 | # Non-abbreviations always get entered, even if they aren't unique
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73 | foreach $word (@_) {
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74 | $hashref->{$word} = $word;
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75 | }
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76 | return if $returnvoid;
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77 | if (wantarray) {
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78 | %{$hashref};
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79 | } else {
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80 | $hashref;
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81 | }
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82 | }
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83 |
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84 | 1;
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