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920dae64 AT |
1 | package Text::Abbrev; |
2 | require 5.005; # Probably works on earlier versions too. | |
3 | require Exporter; | |
4 | ||
5 | our $VERSION = '1.01'; | |
6 | ||
7 | =head1 NAME | |
8 | ||
9 | abbrev - create an abbreviation table from a list | |
10 | ||
11 | =head1 SYNOPSIS | |
12 | ||
13 | use Text::Abbrev; | |
14 | abbrev $hashref, LIST | |
15 | ||
16 | ||
17 | =head1 DESCRIPTION | |
18 | ||
19 | Stores all unambiguous truncations of each element of LIST | |
20 | as keys in the associative array referenced by C<$hashref>. | |
21 | The values are the original list elements. | |
22 | ||
23 | =head1 EXAMPLE | |
24 | ||
25 | $hashref = abbrev qw(list edit send abort gripe); | |
26 | ||
27 | %hash = abbrev qw(list edit send abort gripe); | |
28 | ||
29 | abbrev $hashref, qw(list edit send abort gripe); | |
30 | ||
31 | abbrev(*hash, qw(list edit send abort gripe)); | |
32 | ||
33 | =cut | |
34 | ||
35 | @ISA = qw(Exporter); | |
36 | @EXPORT = qw(abbrev); | |
37 | ||
38 | # Usage: | |
39 | # abbrev \%foo, LIST; | |
40 | # ... | |
41 | # $long = $foo{$short}; | |
42 | ||
43 | sub abbrev { | |
44 | my ($word, $hashref, $glob, %table, $returnvoid); | |
45 | ||
46 | @_ or return; # So we don't autovivify onto @_ and trigger warning | |
47 | if (ref($_[0])) { # hash reference preferably | |
48 | $hashref = shift; | |
49 | $returnvoid = 1; | |
50 | } elsif (ref \$_[0] eq 'GLOB') { # is actually a glob (deprecated) | |
51 | $hashref = \%{shift()}; | |
52 | $returnvoid = 1; | |
53 | } | |
54 | %{$hashref} = (); | |
55 | ||
56 | WORD: foreach $word (@_) { | |
57 | for (my $len = (length $word) - 1; $len > 0; --$len) { | |
58 | my $abbrev = substr($word,0,$len); | |
59 | my $seen = ++$table{$abbrev}; | |
60 | if ($seen == 1) { # We're the first word so far to have | |
61 | # this abbreviation. | |
62 | $hashref->{$abbrev} = $word; | |
63 | } elsif ($seen == 2) { # We're the second word to have this | |
64 | # abbreviation, so we can't use it. | |
65 | delete $hashref->{$abbrev}; | |
66 | } else { # We're the third word to have this | |
67 | # abbreviation, so skip to the next word. | |
68 | next WORD; | |
69 | } | |
70 | } | |
71 | } | |
72 | # Non-abbreviations always get entered, even if they aren't unique | |
73 | foreach $word (@_) { | |
74 | $hashref->{$word} = $word; | |
75 | } | |
76 | return if $returnvoid; | |
77 | if (wantarray) { | |
78 | %{$hashref}; | |
79 | } else { | |
80 | $hashref; | |
81 | } | |
82 | } | |
83 | ||
84 | 1; |