SelectClause.php

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<?php

namespace Elgg\Database\Clauses;

use Closure;
use Doctrine\DBAL\Query\Expression\CompositeExpression;
use Elgg\Database\QueryBuilder;

class SelectClause implements Clause {

    public $expr;

    public function __construct($expr) {
        $this->expr = $expr;
    }

    public function prepare(QueryBuilder $qb, $table_alias = null) {
        $select = $this->expr;

        if ($this->expr instanceof Closure) {
            $select = call_user_func($this->expr, $qb, $table_alias);
        }

        if ($select instanceof CompositeExpression || is_string($select)) {
            $qb->addSelect($select);
        }
    }
}