ExpressionGroup.php

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<?php
 
namespace Wikimedia\Rdbms;
 
use InvalidArgumentException;
use Wikimedia\Rdbms\Database\DbQuoter;
 
abstract class ExpressionGroup implements IExpression {
    protected array $children = [];
 
    public function __construct( IExpression ...$children ) {
        $this->children = $children;
    }
 
    final protected function add( IExpression $expression ) {
        $this->children[] = $expression;
    }
 
    abstract protected function getType(): string;
 
    final public function toSql( DbQuoter $dbQuoter ): string {
        if ( !$this->children ) {
            throw new InvalidArgumentException( "The array of values can't be empty." );
        }
        $sqls = array_map( static fn ( $value ) => $value->toSql( $dbQuoter ), $this->children );
        return '(' . implode( ' ' . $this->getType() . ' ', $sqls ) . ')';
    }
 
    final public function toGeneralizedSql(): string {
        if ( !$this->children ) {
            throw new InvalidArgumentException( "The array of values can't be empty." );
        }
        $sqls = array_map( static fn ( $value ) => $value->toGeneralizedSql(), $this->children );
        return '(' . implode( ' ' . $this->getType() . ' ', $sqls ) . ')';
    }
}