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# Copyright (c) 1997-2024
# Ewgenij Gawrilow, Michael Joswig, and the polymake team
# Technische Universität Berlin, Germany
# https://polymake.org
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version: http://www.gnu.org/licenses/gpl.txt.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#-------------------------------------------------------------------------------
use strict;
use namespaces;
use warnings qw(FATAL void syntax misc);
package Polymake::Core::Permutation;
use Polymake::Struct (
[ '@ISA' => 'Property' ],
[ '$flags' => 'Flags::is_subobject | Flags::is_permutation' ],
'%sensitive_props', # Property->key => Recovery or { $sub_key }->{ Property }-> ... -> Recovery
# if there are rules transferring Property from the permuted subobject back into the basis
'%sub_permutations', # Property->key (subobject) => Property (permutation)
'%parent_permutations', # Property->key (parent object) => ... => $sub_key => [ Property (permutation) ]
);
sub new {
my $self=&_new;
$self->type=$self->type->create_derived($self, $self->belongs_to);
unless ($self->type->abstract) {
$self->accept=\&accept_subobject;
$self->flags |= Flags::is_concrete;
}
$self;
}
sub change_to_augmented {
my ($self, $augm) = @_;
if ($augm != $self->type->super->[0]) {
$self->type->modify_super(0, 1, $augm);
}
}
sub update_pure_type {
my ($self, $proto) = @_;
$self->type = $proto->create_derived($self, $self->belongs_to);
}
####################################################################################
declare $sub_key = \(1); # singular key values used in sensitive_props
declare $is_non_recoverable = \(2);
# Rule => true if it is a recovering rule for a permuted property
sub analyze_rule {
my ($self, $rule) = @_;
my ($regular_out_seen, $perm_out_seen);
foreach my $output (@{$rule->output}) {
if (@$output == 1) {
my $prop = $output->[0];
if ($rule->code == \&Rule::nonexistent) {
if ($enable_plausibility_checks && is_object($self->sensitive_props->{$prop->key})) {
croak( "recovery of property ", $prop->name, " was enabled prior to this rule definition" );
}
$self->sensitive_props->{$prop->key} = $is_non_recoverable;
} else {
if ($enable_plausibility_checks && $self->sensitive_props->{$prop->key} == $is_non_recoverable) {
croak( "recovery of property ", $prop->name, " was disabled prior to this rule definition" );
}
my $recovery = ($self->sensitive_props->{$prop->key} //= new Recovery($self, $prop));
$rule->defined_for->add_producers_of($recovery, $rule);
}
$regular_out_seen = true;
} else {
if ($enable_plausibility_checks && get_array_flags($output) & Flags::is_multiple_new) {
croak( "Rule dealing with permutations may not create new multiple subobjects" );
}
my $perm_pos = find_first_in_path($output, Flags::is_permutation);
if ($perm_pos >= 0) {
if ($perm_pos == 0) {
if ($enable_plausibility_checks && $output->[0] != $self) {
croak( "dependence between two different permutation subobjects on the same level is not allowed" );
}
} else {
add_sub_permutation($self, @$output[0..$perm_pos]);
}
$perm_out_seen = true;
} else {
add_sensitive_sub_property($self, @$output, $rule);
$regular_out_seen = true;
}
}
}
if ($perm_out_seen && $regular_out_seen) {
croak( "A production rule can't create properties in the base object and permutation subobject at the same time" );
}
$regular_out_seen
}
####################################################################################
sub descend_and_create {
my $hash = shift;
my $prop = pop;
foreach $prop (@_) {
$hash = ($hash->{$sub_key}->{$prop->key} //= { });
}
($hash, $prop)
}
####################################################################################
# private:
sub add_sensitive_sub_property {
my $self = shift;
my $rule = pop;
my ($hash, $prop) = descend_and_create($self->sensitive_props, @_);
if ($rule->code == \&Rule::nonexistent) {
if ($enable_plausibility_checks && is_object($hash->{$prop->key})) {
croak( "recovery of property ", $prop->name, " was enabled prior to this rule definition" );
}
$hash->{$prop->key} = $is_non_recoverable;
} else {
if ($enable_plausibility_checks && $hash->{$prop->key} == $is_non_recoverable) {
croak( "recovery of property ", $prop->name, " was disabled prior to this rule definition" );
}
my $recovery = ($hash->{$prop->key} //= new Recovery($self, $prop, @_));
$rule->defined_for->add_producers_of($recovery, $rule);
}
}
####################################################################################
# parent Permutation, (path to subobject permutation Property) =>
sub add_sub_permutation {
my $self = shift;
my $sub_permutation = pop;
my ($hash, $prop) = descend_and_create($self->sub_permutations, @_);
if (exists $hash->{$prop->key}) {
$hash->{$prop->key} == $sub_permutation or
croak( "ambiguous permutation propagation into ", join(".", map { $_->name } @_, $prop), " : ",
$sub_permutation->name, " vs. ", $hash->{$prop->key}->name );
}
$hash->{$prop->key} = $sub_permutation;
# provide for transitive closure
$hash->{$sub_key}->{$prop->key} = $sub_permutation->sub_permutations;
# establish reversed relation
$hash = $sub_permutation->parent_permutations;
foreach my $parent_prop ($prop, reverse @_) {
$hash = ($hash->{$parent_prop->key} //= { });
}
push @{$hash->{$sub_key}}, $self;
}
####################################################################################
# ( Property, ... ) => Recovery
sub find_sensitive_sub_property {
my $self = shift;
my $prop = pop;
my $hash = $self->sensitive_props;
foreach $prop (@_) {
defined($hash = $hash->{$sub_key}) or return;
defined($hash = $hash->{$prop->key}) or return;
}
$hash->{$prop->key}
}
####################################################################################
sub find_sub_permutation {
my $self = shift;
my $prop = pop;
my $hash = $self->sub_permutations;
foreach $prop (@_) {
defined($hash = $hash->{$sub_key}) or return;
defined($hash = $hash->{$prop->key}) or return;
}
$hash->{$prop->key}
}
####################################################################################
package Polymake::Core::Permutation::Recovery;
use Polymake::Struct (
[ new => '$$@' ],
[ '$permutation' => 'weak(#1)' ],
[ '$property' => '#2' ],
[ '@descend' => '@' ],
);
sub key { $_[0] }
sub defined_for { $_[0]->property->defined_for }
sub name {
my ($self) = @_;
"recovery of " . join(".", @{$self->descend}, $self->property->name) .
" after " . $self->permutation->belongs_to->full_name . "::" . $self->permutation->name
}
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