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<?php declare(strict_types=1); |
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/* (c) Anton Medvedev <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Deployer\Selector; |
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use Deployer\Host\Host; |
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use Deployer\Host\HostCollection; |
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use function Deployer\Support\array_all; |
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class Selector |
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{ |
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private $hosts; |
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public function __construct(HostCollection $hosts) |
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{ |
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$this->hosts = $hosts; |
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} |
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/** |
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* @param string $selectExpression |
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* @return Host[] |
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*/ |
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public function selectHosts(string $selectExpression) |
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{ |
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$selector = self::parse($selectExpression); |
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$hosts = []; |
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foreach ($this->hosts as $host) { |
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if (self::apply($selector, $host)) { |
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$hosts[] = $host; |
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} |
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} |
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return $hosts; |
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} |
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public static function apply($selector, Host $host) |
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{ |
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$labels = $host->get('labels', []); |
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$ok = []; |
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foreach ($selector as list($op, $var, $value)) { |
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if ($op === 'all') { |
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$ok[] = true; |
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continue; |
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} |
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if ($var === 'host') { |
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$ok[] = self::compare($op, $host->getAlias(), $value); |
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} else { |
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$ok[] = self::compare($op, $labels[$var] ?? null, $value); |
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} |
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} |
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return count($ok) > 0 && array_all($ok, function ($value) { |
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return $value; |
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}); |
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} |
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private static function compare(string $op, $a, $b): bool |
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{ |
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if ($op === '=') { |
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return $a === $b; |
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} |
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if ($op === '!=') { |
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return $a !== $b; |
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} |
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return false; |
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} |
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public static function parse(string $selectExpression) |
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{ |
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$actions = []; |
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// TODO: Implement correct parser and maybe add extra features. |
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$parts = explode(',', $selectExpression); |
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foreach ($parts as $part) { |
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$part = trim($part); |
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if ($part === 'all') { |
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$actions[] = ['all', null, null]; |
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continue; |
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} |
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if (preg_match('/(?<var>.+?)(?<op>!?=)(?<value>.+)/', $part, $match)) { |
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$actions[] = [$match['op'], trim($match['var']), trim($match['value'])]; |
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} else { |
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throw new \InvalidArgumentException("Invalid selector \"$part\"."); |
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} |
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} |
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return $actions; |
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} |
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} |
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deployphp /
deployer
