[14489] | 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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