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package Tie::Array; use 5.006_001; use strict; use Carp; our $VERSION = '1.05'; # Pod documentation after __END__ below. sub DESTROY { } sub EXTEND { } sub UNSHIFT { scalar shift->SPLICE(0,0,@_) } sub SHIFT { shift->SPLICE(0,1) } sub CLEAR { shift->STORESIZE(0) } sub PUSH { my $obj = shift; my $i = $obj->FETCHSIZE; $obj->STORE($i++, shift) while (@_); } sub POP { my $obj = shift; my $newsize = $obj->FETCHSIZE - 1; my $val; if ($newsize >= 0) { $val = $obj->FETCH($newsize); $obj->STORESIZE($newsize); } $val; } sub SPLICE { my $obj = shift; my $sz = $obj->FETCHSIZE; my $off = (@_) ? shift : 0; $off += $sz if ($off < 0); my $len = (@_) ? shift : $sz - $off; $len += $sz - $off if $len < 0; my @result; for (my $i = 0; $i < $len; $i++) { push(@result,$obj->FETCH($off+$i)); } $off = $sz if $off > $sz; $len -= $off + $len - $sz if $off + $len > $sz; if (@_ > $len) { # Move items up to make room my $d = @_ - $len; my $e = $off+$len; $obj->EXTEND($sz+$d); for (my $i=$sz-1; $i >= $e; $i--) { my $val = $obj->FETCH($i); $obj->STORE($i+$d,$val); } } elsif (@_ < $len) { # Move items down to close the gap my $d = $len - @_; my $e = $off+$len; for (my $i=$off+$len; $i < $sz; $i++) { my $val = $obj->FETCH($i); $obj->STORE($i-$d,$val); } $obj->STORESIZE($sz-$d); } for (my $i=0; $i < @_; $i++) { $obj->STORE($off+$i,$_[$i]); } return wantarray ? @result : pop @result; } sub EXISTS { my $pkg = ref $_[0]; croak "$pkg doesn't define an EXISTS method"; } sub DELETE { my $pkg = ref $_[0]; croak "$pkg doesn't define a DELETE method"; } package Tie::StdArray; use vars qw(@ISA); @ISA = 'Tie::Array'; sub TIEARRAY { bless [], $_[0] } sub FETCHSIZE { scalar @{$_[0]} } sub STORESIZE { $#{$_[0]} = $_[1]-1 } sub STORE { $_[0]->[$_[1]] = $_[2] } sub FETCH { $_[0]->[$_[1]] } sub CLEAR { @{$_[0]} = () } sub POP { pop(@{$_[0]}) } sub PUSH { my $o = shift; push(@$o,@_) } sub SHIFT { shift(@{$_[0]}) } sub UNSHIFT { my $o = shift; unshift(@$o,@_) } sub EXISTS { exists $_[0]->[$_[1]] } sub DELETE { delete $_[0]->[$_[1]] } sub SPLICE { my $ob = shift; my $sz = $ob->FETCHSIZE; my $off = @_ ? shift : 0; $off += $sz if $off < 0; my $len = @_ ? shift : $sz-$off; return splice(@$ob,$off,$len,@_); } 1; __END__ =head1 NAME Tie::Array - base class for tied arrays =head1 SYNOPSIS package Tie::NewArray; use Tie::Array; @ISA = ('Tie::Array'); # mandatory methods sub TIEARRAY { ... } sub FETCH { ... } sub FETCHSIZE { ... } sub STORE { ... } # mandatory if elements writeable sub STORESIZE { ... } # mandatory if elements can be added/deleted sub EXISTS { ... } # mandatory if exists() expected to work sub DELETE { ... } # mandatory if delete() expected to work # optional methods - for efficiency sub CLEAR { ... } sub PUSH { ... } sub POP { ... } sub SHIFT { ... } sub UNSHIFT { ... } sub SPLICE { ... } sub EXTEND { ... } sub DESTROY { ... } package Tie::NewStdArray; use Tie::Array; @ISA = ('Tie::StdArray');