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Revision 683f1b3d

Von Sven Schöling vor fast 14 Jahren hinzugefügt

  • ID 683f1b3d0873f9add78b3a383b48b48050cdb1ad
  • Vorgänger 914c56f4
  • Nachfolger 8a149188

Update auf List::MoreUtils v0.30

Unterschiede anzeigen:

modules/fallback/List/MoreUtils.pm
use 5.00503;
use strict;
use Exporter ();
use DynaLoader ();
use vars qw{ $VERSION @ISA @EXPORT_OK %EXPORT_TAGS };
BEGIN {
$VERSION = '0.30';
@ISA = qw{ Exporter DynaLoader };
@EXPORT_OK = qw{
any all none notall true false
firstidx first_index lastidx last_index
insert_after insert_after_string
apply indexes
after after_incl before before_incl
firstval first_value lastval last_value
each_array each_arrayref
pairwise natatime
mesh zip uniq distinct
minmax part
};
%EXPORT_TAGS = (
all => \@EXPORT_OK,
);
require Exporter;
require DynaLoader;
# Load the XS at compile-time so that redefinition warnings will be
# thrown correctly if the XS versions of part or indexes loaded
eval {
# PERL_DL_NONLAZY must be false, or any errors in loading will just
# cause the perl code to be tested
local $ENV{PERL_DL_NONLAZY} = 0 if $ENV{PERL_DL_NONLAZY};
use vars qw($VERSION @ISA @EXPORT_OK %EXPORT_TAGS);
@ISA = qw(Exporter DynaLoader);
bootstrap List::MoreUtils $VERSION;
1;
%EXPORT_TAGS = (
all => [ qw(any all none notall true false firstidx first_index lastidx
last_index insert_after insert_after_string apply after after_incl before
before_incl indexes firstval first_value lastval last_value each_array
each_arrayref pairwise natatime mesh zip uniq minmax part bsearch) ],
);
} unless $ENV{LIST_MOREUTILS_PP};
}
@EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
# Always use Perl apply() until memory leaks are resolved.
sub apply (&@) {
my $action = shift;
&$action foreach my @values = @_;
wantarray ? @values : $values[-1];
}
$VERSION = '0.25_02';
# Always use Perl part() until memory leaks are resolved.
sub part (&@) {
my ($code, @list) = @_;
my @parts;
push @{ $parts[ $code->($_) ] }, $_ foreach @list;
return @parts;
}
eval {
local $ENV{PERL_DL_NONLAZY} = 0 if $ENV{PERL_DL_NONLAZY};
bootstrap List::MoreUtils $VERSION;
1;
} if not $ENV{LIST_MOREUTILS_PP};
# Always use Perl indexes() until memory leaks are resolved.
sub indexes (&@) {
my $test = shift;
grep {
local *_ = \$_[$_];
$test->()
} 0 .. $#_;
}
eval <<'EOP' if not defined &any;
# Load the pure-Perl versions of the other functions if needed
eval <<'END_PERL' unless defined &any;
require POSIX;
# Use pure scalar boolean return values for compatibility with XS
use constant YES => ! 0;
use constant NO => ! 1;
sub any (&@) {
my $f = shift;
return if ! @_;
for (@_) {
return 1 if $f->();
foreach ( @_ ) {
return YES if $f->();
}
return 0;
return NO;
}
sub all (&@) {
my $f = shift;
return if ! @_;
for (@_) {
return 0 if ! $f->();
foreach ( @_ ) {
return NO unless $f->();
}
return 1;
return YES;
}
sub none (&@) {
my $f = shift;
return 1 if ! @_;
for (@_) {
return 0 if $f->();
foreach ( @_ ) {
return NO if $f->();
}
return 1;
return YES;
}
sub notall (&@) {
my $f = shift;
return if ! @_;
for (@_) {
return 1 if ! $f->();
foreach ( @_ ) {
return YES unless $f->();
}
return 0;
return NO;
}
sub true (&@) {
my $f = shift;
my $f = shift;
my $count = 0;
for (@_) {
$count++ if $f->();
foreach ( @_ ) {
$count++ if $f->();
}
return $count;
}
sub false (&@) {
my $f = shift;
my $f = shift;
my $count = 0;
for (@_) {
$count++ if ! $f->();
foreach ( @_ ) {
$count++ unless $f->();
}
return $count;
}
sub firstidx (&@) {
my $f = shift;
for my $i (0 .. $#_) {
local *_ = \$_[$i];
return $i if $f->();
foreach my $i ( 0 .. $#_ ) {
local *_ = \$_[$i];
return $i if $f->();
}
return -1;
}
sub lastidx (&@) {
my $f = shift;
for my $i (reverse 0 .. $#_) {
local *_ = \$_[$i];
return $i if $f->();
foreach my $i ( reverse 0 .. $#_ ) {
local *_ = \$_[$i];
return $i if $f->();
}
return -1;
}
sub insert_after (&$\@) {
my ($code, $val, $list) = @_;
my ($f, $val, $list) = @_;
my $c = -1;
local *_;
for my $i (0 .. $#$list) {
$_ = $list->[$i];
$c = $i, last if $code->();
foreach my $i ( 0 .. $#$list ) {
$_ = $list->[$i];
$c = $i, last if $f->();
}
@$list = (@{$list}[0..$c], $val, @{$list}[$c+1..$#$list]) and return 1 if $c != -1;
@$list = (
@{$list}[ 0 .. $c ],
$val,
@{$list}[ $c + 1 .. $#$list ],
) and return 1 if $c != -1;
return 0;
}
sub insert_after_string ($$\@) {
my ($string, $val, $list) = @_;
my $c = -1;
for my $i (0 .. $#$list) {
local $^W = 0;
$c = $i, last if $string eq $list->[$i];
foreach my $i ( 0 .. $#$list ) {
local $^W = 0;
$c = $i, last if $string eq $list->[$i];
}
@$list = (@{$list}[0..$c], $val, @{$list}[$c+1..$#$list]) and return 1 if $c != -1;
@$list = (
@{$list}[ 0 .. $c ],
$val,
@{$list}[ $c + 1 .. $#$list ],
) and return 1 if $c != -1;
return 0;
}
sub apply (&@) {
my $action = shift;
&$action for my @values = @_;
wantarray ? @values : $values[-1];
}
sub after (&@)
{
sub after (&@) {
my $test = shift;
my $started;
my $lag;
grep $started ||= do { my $x=$lag; $lag=$test->(); $x}, @_;
grep $started ||= do {
my $x = $lag;
$lag = $test->();
$x
}, @_;
}
sub after_incl (&@)
{
sub after_incl (&@) {
my $test = shift;
my $started;
grep $started ||= $test->(), @_;
}
sub before (&@)
{
sub before (&@) {
my $test = shift;
my $keepgoing=1;
grep $keepgoing &&= !$test->(), @_;
my $more = 1;
grep $more &&= ! $test->(), @_;
}
sub before_incl (&@)
{
sub before_incl (&@) {
my $test = shift;
my $keepgoing=1;
my $lag=1;
grep $keepgoing &&= do { my $x=$lag; $lag=!$test->(); $x}, @_;
my $more = 1;
my $lag = 1;
grep $more &&= do {
my $x = $lag;
$lag = ! $test->();
$x
}, @_;
}
sub indexes (&@)
{
my $test = shift;
grep {local *_=\$_[$_]; $test->()} 0..$#_;
}
sub lastval (&@)
{
sub lastval (&@) {
my $test = shift;
my $ix;
for ($ix=$#_; $ix>=0; $ix--)
{
for ( $ix = $#_; $ix >= 0; $ix-- ) {
local *_ = \$_[$ix];
my $testval = $test->();
$_[$ix] = $_; # simulate $_ as alias
# Simulate $_ as alias
$_[$ix] = $_;
return $_ if $testval;
}
return undef;
}
sub firstval (&@)
{
sub firstval (&@) {
my $test = shift;
foreach (@_)
{
foreach ( @_ ) {
return $_ if $test->();
}
return undef;
}
sub pairwise(&\@\@)
{
sub pairwise (&\@\@) {
my $op = shift;
use vars qw/@A @B/;
local (*A, *B) = @_; # syms for caller's input arrays
# Symbols for caller's input arrays
use vars qw{ @A @B };
local ( *A, *B ) = @_;
# Localise $a, $b
my ($caller_a, $caller_b) = do
{
my ( $caller_a, $caller_b ) = do {
my $pkg = caller();
no strict 'refs';
\*{$pkg.'::a'}, \*{$pkg.'::b'};
};
my $limit = $#A > $#B? $#A : $#B; # loop iteration limit
# Loop iteration limit
my $limit = $#A > $#B? $#A : $#B;
local(*$caller_a, *$caller_b);
map # This map expression is also the return value.
{
# assign to $a, $b as refs to caller's array elements
(*$caller_a, *$caller_b) = \($A[$_], $B[$_]);
$op->(); # perform the transformation
# This map expression is also the return value
local( *$caller_a, *$caller_b );
map {
# Assign to $a, $b as refs to caller's array elements
( *$caller_a, *$caller_b ) = \( $A[$_], $B[$_] );
# Perform the transformation
$op->();
} 0 .. $limit;
}
sub each_array (\@;\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@)
{
sub each_array (\@;\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@) {
return each_arrayref(@_);
}
sub each_arrayref
{
my @arr_list = @_; # The list of references to the arrays
my $index = 0; # Which one the caller will get next
my $max_num = 0; # Number of elements in longest array
sub each_arrayref {
my @list = @_; # The list of references to the arrays
my $index = 0; # Which one the caller will get next
my $max = 0; # Number of elements in longest array
# Get the length of the longest input array
foreach (@arr_list)
{
unless (ref($_) eq 'ARRAY')
{
foreach ( @list ) {
unless ( ref $_ eq 'ARRAY' ) {
require Carp;
Carp::croak "each_arrayref: argument is not an array reference\n";
Carp::croak("each_arrayref: argument is not an array reference\n");
}
$max_num = @$_ if @$_ > $max_num;
$max = @$_ if @$_ > $max;
}
# Return the iterator as a closure wrt the above variables.
return sub
{
if (@_)
{
return sub {
if ( @_ ) {
my $method = shift;
if ($method eq 'index')
{
# Return current (last fetched) index
return undef if $index == 0 || $index > $max_num;
return $index-1;
}
else
{
unless ( $method eq 'index' ) {
require Carp;
Carp::croak "each_array: unknown argument '$method' passed to iterator.";
Carp::croak("each_array: unknown argument '$method' passed to iterator.");
}
# Return current (last fetched) index
return undef if $index == 0 || $index > $max;
return $index - 1;
}
return if $index >= $max_num; # No more elements to return
# No more elements to return
return if $index >= $max;
my $i = $index++;
return map $_->[$i], @arr_list; # Return ith elements
# Return ith elements
return map $_->[$i], @list;
}
}
sub natatime ($@)
{
my $n = shift;
sub natatime ($@) {
my $n = shift;
my @list = @_;
return sub
{
return sub {
return splice @list, 0, $n;
}
}
sub mesh (\@\@;\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@) {
my $max = -1;
$max < $#$_ && ($max = $#$_) for @_;
map { my $ix = $_; map $_->[$ix], @_; } 0..$max;
$max < $#$_ && ( $max = $#$_ ) foreach @_;
map {
my $ix = $_;
map $_->[$ix], @_;
} 0 .. $max;
}
sub uniq (@) {
my %h;
my $ref = \1;
map { $h{defined $_ ? $_ : $ref}++ == 0 ? $_ : () } @_;
my %seen = ();
grep { not $seen{$_}++ } @_;
}
sub minmax (@) {
return if ! @_;
return unless @_;
my $min = my $max = $_[0];
for (my $i = 1; $i < @_; $i += 2) {
if ($_[$i-1] <= $_[$i]) {
$min = $_[$i-1] if $min > $_[$i-1];
$max = $_[$i] if $max < $_[$i];
} else {
$min = $_[$i] if $min > $_[$i];
$max = $_[$i-1] if $max < $_[$i-1];
}
}
if (@_ & 1) {
my $i = $#_;
if ($_[$i-1] <= $_[$i]) {
$min = $_[$i-1] if $min > $_[$i-1];
$max = $_[$i] if $max < $_[$i];
} else {
$min = $_[$i] if $min > $_[$i];
$max = $_[$i-1] if $max < $_[$i-1];
}
for ( my $i = 1; $i < @_; $i += 2 ) {
if ( $_[$i-1] <= $_[$i] ) {
$min = $_[$i-1] if $min > $_[$i-1];
$max = $_[$i] if $max < $_[$i];
} else {
$min = $_[$i] if $min > $_[$i];
$max = $_[$i-1] if $max < $_[$i-1];
}
}
return ($min, $max);
}
sub part(&@) {
my ($code, @list) = @_;
my @parts;
push @{ $parts[$code->($_)] }, $_ for @list;
return @parts;
}
sub bsearch(&@) {
my $code = shift;
my $rc;
my $i = 0;
my $j = @_;
do {
my $k = int(($i + $j) / 2);
return if $k >= @_;
local *_ = \$_[$k];
$rc = $code->();
$rc == 0 and
return wantarray ? $_ : 1;
if ($rc < 0) {
$i = $k + 1;
if ( @_ & 1 ) {
my $i = $#_;
if ($_[$i-1] <= $_[$i]) {
$min = $_[$i-1] if $min > $_[$i-1];
$max = $_[$i] if $max < $_[$i];
} else {
$j = $k - 1;
$min = $_[$i] if $min > $_[$i];
$max = $_[$i-1] if $max < $_[$i-1];
}
} until $i > $j;
}
return;
return ($min, $max);
}
sub _XScompiled {
return 0;
}
EOP
END_PERL
die $@ if $@;
# Function aliases
*first_index = \&firstidx;
*last_index = \&lastidx;
*last_index = \&lastidx;
*first_value = \&firstval;
*last_value = \&lastval;
*zip = \&mesh;
*last_value = \&lastval;
*zip = \&mesh;
*distinct = \&uniq;
1;
__END__
=pod
=head1 NAME
List::MoreUtils - Provide the stuff missing in List::Util
=head1 SYNOPSIS
use List::MoreUtils qw(any all none notall true false firstidx first_index
lastidx last_index insert_after insert_after_string
apply after after_incl before before_incl indexes
firstval first_value lastval last_value each_array
each_arrayref pairwise natatime mesh zip uniq minmax);
use List::MoreUtils qw{
any all none notall true false
firstidx first_index lastidx last_index
insert_after insert_after_string
apply indexes
after after_incl before before_incl
firstval first_value lastval last_value
each_array each_arrayref
pairwise natatime
mesh zip uniq distinct minmax part
};
=head1 DESCRIPTION
C<List::MoreUtils> provides some trivial but commonly needed functionality on lists
which is not going to go into C<List::Util>.
B<List::MoreUtils> provides some trivial but commonly needed functionality on
lists which is not going to go into L<List::Util>.
All of the below functions are implementable in only a couple of lines of Perl
code. Using the functions from this module however should give slightly better
......
BLOCK. Sets C<$_> for each item in LIST in turn:
print "At least one value undefined"
if any { !defined($_) } @list;
if any { ! defined($_) } @list;
Returns false otherwise, or C<undef> if LIST is empty.
Returns false otherwise, or if LIST is empty.
=item all BLOCK LIST
......
print "All items defined"
if all { defined($_) } @list;
Returns false otherwise, or C<undef> if LIST is empty.
Returns false otherwise, or if LIST is empty.
=item none BLOCK LIST
Logically the negation of C<any>. Returns a true value if no item in LIST meets the
criterion given through BLOCK. Sets C<$_> for each item in LIST in turn:
Logically the negation of C<any>. Returns a true value if no item in LIST meets
the criterion given through BLOCK. Sets C<$_> for each item in LIST in turn:
print "No value defined"
if none { defined($_) } @list;
Returns false otherwise, or C<undef> if LIST is empty.
Returns false otherwise, or if LIST is empty.
=item notall BLOCK LIST
Logically the negation of C<all>. Returns a true value if not all items in LIST meet
the criterion given through BLOCK. Sets C<$_> for each item in LIST in turn:
Logically the negation of C<all>. Returns a true value if not all items in LIST
meet the criterion given through BLOCK. Sets C<$_> for each item in LIST in
turn:
print "Not all values defined"
if notall { defined($_) } @list;
Returns false otherwise, or C<undef> if LIST is empty.
Returns false otherwise, or if LIST is empty.
=item true BLOCK LIST
Counts the number of elements in LIST for which the criterion in BLOCK is true. Sets C<$_> for
each item in LIST in turn:
Counts the number of elements in LIST for which the criterion in BLOCK is true.
Sets C<$_> for each item in LIST in turn:
printf "%i item(s) are defined", true { defined($_) } @list;
=item false BLOCK LIST
Counts the number of elements in LIST for which the criterion in BLOCK is false. Sets C<$_> for
each item in LIST in turn:
Counts the number of elements in LIST for which the criterion in BLOCK is false.
Sets C<$_> for each item in LIST in turn:
printf "%i item(s) are not defined", false { defined($_) } @list;
......
=item first_index BLOCK LIST
Returns the index of the first element in LIST for which the criterion in BLOCK is true. Sets C<$_>
for each item in LIST in turn:
Returns the index of the first element in LIST for which the criterion in BLOCK
is true. Sets C<$_> for each item in LIST in turn:
my @list = (1, 4, 3, 2, 4, 6);
printf "item with index %i in list is 4", firstidx { $_ == 4 } @list;
......
=item last_index BLOCK LIST
Returns the index of the last element in LIST for which the criterion in BLOCK is true. Sets C<$_>
for each item in LIST in turn:
Returns the index of the last element in LIST for which the criterion in BLOCK
is true. Sets C<$_> for each item in LIST in turn:
my @list = (1, 4, 3, 2, 4, 6);
printf "item with index %i in list is 4", lastidx { $_ == 4 } @list;
......
=item insert_after BLOCK VALUE LIST
Inserts VALUE after the first item in LIST for which the criterion in BLOCK is true. Sets C<$_> for
each item in LIST in turn.
Inserts VALUE after the first item in LIST for which the criterion in BLOCK is
true. Sets C<$_> for each item in LIST in turn.
my @list = qw/This is a list/;
insert_after { $_ eq "a" } "longer" => @list;
......
for (my @mult = @list) { $_ *= 2 }
=item before BLOCK LIST
Returns a list of values of LIST upto (and not including) the point where BLOCK
returns a true value. Sets C<$_> for each element in LIST in turn.
=item before_incl BLOCK LIST
Same as C<before> but also includes the element for which BLOCK is true.
=item after BLOCK LIST
Returns a list of the values of LIST after (and not including) the point
......
Same as C<after> but also inclues the element for which BLOCK is true.
=item before BLOCK LIST
Returns a list of values of LIST upto (and not including) the point where BLOCK
returns a true value. Sets C<$_> for each element in LIST in turn.
=item before_incl BLOCK LIST
Same as C<before> but also includes the element for which BLOCK is true.
=item indexes BLOCK LIST
Evaluates BLOCK for each element in LIST (assigned to C<$_>) and returns a list
......
=item uniq LIST
=item distinct LIST
Returns a new list by stripping duplicate values in LIST. The order of
elements in the returned list is the same as in LIST. In scalar context,
returns the number of unique elements in LIST.
......
=item minmax LIST
Calculates the minimum and maximum of LIST and returns a two element list with
the first element being the minimum and the second the maximum. Returns the empty
list if LIST was empty.
the first element being the minimum and the second the maximum. Returns the
empty list if LIST was empty.
The minmax algorithm differs from a naive iteration over the list where each element
is compared to two values being the so far calculated min and max value in that it
only requires 3n/2 - 2 comparisons. Thus it is the most efficient possible algorithm.
The C<minmax> algorithm differs from a naive iteration over the list where each
element is compared to two values being the so far calculated min and max value
in that it only requires 3n/2 - 2 comparisons. Thus it is the most efficient
possible algorithm.
However, the Perl implementation of it has some overhead simply due to the fact
that there are more lines of Perl code involved. Therefore, LIST needs to be
fairly big in order for minmax to win over a naive implementation. This
fairly big in order for C<minmax> to win over a naive implementation. This
limitation does not apply to the XS version.
=item part BLOCK LIST
Partitions LIST based on the return value of BLOCK which denotes into which partition
the current value is put.
Partitions LIST based on the return value of BLOCK which denotes into which
partition the current value is put.
Returns a list of the partitions thusly created. Each partition created is a
reference to an array.
......
Negative values are only ok when they refer to a partition previously created:
my @idx = (0, 1, -1);
my $i = 0;
my @part = part { $idx[$++ % 3] } 1 .. 8; # [1, 4, 7], [2, 3, 5, 6, 8]
=item bsearch BLOCK LIST
Performs a binary search on LIST which must be a sorted list of values. BLOCK
must return a negative value if the current element (stored in C<$_>) is smaller,
a positive value if it is bigger and zero if it matches.
Returns a boolean value in scalar context. In list context, it returns the element
if it was found, otherwise the empty list.
my @idx = ( 0, 1, -1 );
my $i = 0;
my @part = part { $idx[$++ % 3] } 1 .. 8; # [1, 4, 7], [2, 3, 5, 6, 8]
=back
......
Nothing by default. To import all of this module's symbols, do the conventional
use List::MoreUtils qw/:all/;
use List::MoreUtils ':all';
It may make more sense though to only import the stuff your program actually needs:
It may make more sense though to only import the stuff your program actually
needs:
use List::MoreUtils qw/any firstidx/;
use List::MoreUtils qw{ any firstidx };
=head1 ENVIRONMENT
......
for reporting of bugs. I don't see any reason to use it in a production
environment.
=head1 VERSION
This is version 0.25_01.
=head1 BUGS
There is a problem with a bug in 5.6.x perls. It is a syntax error to write
things like:
my @x = apply { s/foo/bar/ } qw/foo bar baz/;
my @x = apply { s/foo/bar/ } qw{ foo bar baz };
It has to be written as either
......
my @x = apply { s/foo/bar/ } my @dummy = qw/foo bar baz/;
Perl5.5.x and perl5.8.x don't suffer from this limitation.
Perl 5.5.x and Perl 5.8.x don't suffer from this limitation.
If you have a functionality that you could imagine being in this module, please
drop me a line. This module's policy will be less strict than C<List::Util>'s when
it comes to additions as it isn't a core module.
drop me a line. This module's policy will be less strict than L<List::Util>'s
when it comes to additions as it isn't a core module.
When you report bugs, it would be nice if you could additionally give me the
output of your program with the environment variable C<LIST_MOREUTILS_PP> set
to a true value. That way I know where to look for the problem (in XS,
pure-Perl or possibly both).
=head1 SUPPORT
Bugs should always be submitted via the CPAN bug tracker.
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=List-MoreUtils>
=head1 THANKS
Credits go to a number of people: Steve Purkis for giving me namespace advice
and James Keenan and Terrence Branno for their effort of keeping the CPAN
tidier by making List::Utils obsolete.
tidier by making L<List::Utils> obsolete.
Brian McCauley suggested the inclusion of apply() and provided the pure-Perl
implementation for it.
......
=head1 TODO
A pile of requests from other people is still pending further processing in my
mailbox. This includes:
A pile of requests from other people is still pending further processing in
my mailbox. This includes:
=over 4
=item * List::Util export pass-through
Allow B<List::MoreUtils> to pass-through the regular L<List::Util>
functions to end users only need to C<use> the one module.
=item * uniq_by(&@)
Use code-reference to extract a key based on which the uniqueness is
......
=item * listify
Always return a flat list when either a simple scalar value was passed or an array-reference.
Suggested by Mark Summersault.
Always return a flat list when either a simple scalar value was passed or an
array-reference. Suggested by Mark Summersault.
=back
......
=head1 AUTHOR
Tassilo von Parseval, E<lt>vparseval@gmail.comE<gt>
Tassilo von Parseval E<lt>tassilo.von.parseval@rwth-aachen.deE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2004-2009 by Tassilo von Parseval
Copyright 2004 - 2010 by Tassilo von Parseval
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.4 or,

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