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117 lines
2.9 KiB
117 lines
2.9 KiB
<?php
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// (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
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//
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// All Rights Reserved. See copyright.txt for details and a complete list of authors.
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// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
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// $Id$
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class Tiki_Transition
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{
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private $from;
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private $to;
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private $states = [];
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private $guards = [];
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private $blockers;
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public function __construct($from, $to)
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{
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$this->from = $from;
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$this->to = $to;
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}
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public function setStates(array $states)
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{
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$this->states = $states;
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$this->blockers = null;
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}
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public function addGuard($type, $boundary, $set)
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{
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if (method_exists($this, '_' . $type)) {
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$this->guards[] = [$type, $boundary, $set];
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} else {
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$this->guards[] = ['unknown', 1, [$type]];
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}
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}
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public function isReady()
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{
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return count($this->explain()) == 0;
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}
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public function explain()
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{
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$this->blockers = [];
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$this->_exactly(1, [$this->from]);
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$this->_exactly(0, [$this->to]);
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$this->applyGuards();
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return $this->blockers;
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}
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private function applyGuards()
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{
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foreach ($this->guards as $guard) {
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$method = '_' . array_shift($guard);
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call_user_func_array([$this, $method], $guard);
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}
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}
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private function addBlocker($type, $amount, $set)
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{
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$this->blockers[] = ['class' => $type, 'count' => $amount, 'set' => array_values($set)];
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}
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private function _exactly($amount, $list)
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{
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if (count($list) < $amount) {
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$this->addBlocker('invalid', $amount, $list);
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return;
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}
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$intersect = array_intersect($this->states, $list);
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$count = count($intersect);
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if ($count > $amount) {
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$this->addBlocker('extra', $count - $amount, $intersect);
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} elseif ($count < $amount) {
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$set = array_diff($list, $intersect);
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$this->addBlocker('missing', $amount - $count, $set);
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}
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}
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private function _atMost($amount, $list)
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{
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$intersect = array_intersect($this->states, $list);
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$count = count($intersect);
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if ($count > $amount) {
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$this->addBlocker('extra', $count - $amount, $intersect);
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}
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}
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private function _atLeast($amount, $list)
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{
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if (count($list) < $amount) {
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$this->addBlocker('invalid', $amount, $list);
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return;
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}
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$intersect = array_intersect($this->states, $list);
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$count = count($intersect);
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if ($count < $amount) {
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$set = array_diff($list, $intersect);
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$this->addBlocker('missing', $amount - $count, $set);
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}
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}
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private function _unknown($amount, $list)
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{
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$this->addBlocker('unknown', 1, $list);
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}
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}
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