package Text::Abbrev;
-require 5.000;
+require 5.005; # Probably works on earlier versions too.
require Exporter;
+our $VERSION = '1.00';
+
+=head1 NAME
+
+abbrev - create an abbreviation table from a list
+
+=head1 SYNOPSIS
+
+ use Text::Abbrev;
+ abbrev $hashref, LIST
+
+
+=head1 DESCRIPTION
+
+Stores all unambiguous truncations of each element of LIST
+as keys in the associative array referenced by C<$hashref>.
+The values are the original list elements.
+
+=head1 EXAMPLE
+
+ $hashref = abbrev qw(list edit send abort gripe);
+
+ %hash = abbrev qw(list edit send abort gripe);
+
+ abbrev $hashref, qw(list edit send abort gripe);
+
+ abbrev(*hash, qw(list edit send abort gripe));
+
+=cut
+
@ISA = qw(Exporter);
@EXPORT = qw(abbrev);
# Usage:
-# &abbrev(*foo,LIST);
+# abbrev \%foo, LIST;
# ...
# $long = $foo{$short};
sub abbrev {
- local(*domain) = shift;
- @cmp = @_;
- %domain = ();
- foreach $name (@_) {
- @extra = split(//,$name);
- $abbrev = shift(@extra);
- $len = 1;
- foreach $cmp (@cmp) {
- next if $cmp eq $name;
- while (substr($cmp,0,$len) eq $abbrev) {
- $abbrev .= shift(@extra);
- ++$len;
+ my ($word, $hashref, $glob, %table, $returnvoid);
+
+ if (ref($_[0])) { # hash reference preferably
+ $hashref = shift;
+ $returnvoid = 1;
+ } elsif (ref \$_[0] eq 'GLOB') { # is actually a glob (deprecated)
+ $hashref = \%{shift()};
+ $returnvoid = 1;
+ }
+ %{$hashref} = ();
+
+ WORD: foreach $word (@_) {
+ for (my $len = (length $word) - 1; $len > 0; --$len) {
+ my $abbrev = substr($word,0,$len);
+ my $seen = ++$table{$abbrev};
+ if ($seen == 1) { # We're the first word so far to have
+ # this abbreviation.
+ $hashref->{$abbrev} = $word;
+ } elsif ($seen == 2) { # We're the second word to have this
+ # abbreviation, so we can't use it.
+ delete $hashref->{$abbrev};
+ } else { # We're the third word to have this
+ # abbreviation, so skip to the next word.
+ next WORD;
}
}
- $domain{$abbrev} = $name;
- while (@extra) {
- $abbrev .= shift(@extra);
- $domain{$abbrev} = $name;
- }
+ }
+ # Non-abbreviations always get entered, even if they aren't unique
+ foreach $word (@_) {
+ $hashref->{$word} = $word;
+ }
+ return if $returnvoid;
+ if (wantarray) {
+ %{$hashref};
+ } else {
+ $hashref;
}
}
1;
-