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<?php
/*
* This file is part of the affilinet Product Data PHP SDK.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Affilinet\ProductData\Requests\Helper;
class Expression implements ExpressionInterface
{
public function __construct()
{
return $this;
}
/**
* @var string
*/
private $expression;
/**
* @param $keyword string
* @return Expression
*/
public function exactly($keyword)
{
return $this->combineLiterals(['"'. $keyword . '"'], 'AND');
}
/**
* @param array ...$keywords
* @return Expression
*/
public function containsOneOf(...$keywords)
{
return $this->combineLiterals($keywords, 'OR');
}
/**
*
* @param string $keyword
* @return Expression
*/
public function contains($keyword)
{
return $this->combineLiterals([$keyword], 'AND');
}
/**
* @param array $keywords
* @return Expression
*/
public function containsAllOf(...$keywords)
{
return $this->combineLiterals($keywords, 'AND');
}
/**
* @param array $keywords
* @return Expression
*/
public function containsNot(...$keywords)
{
return $this->combineLiterals($keywords, 'NOT');
}
/**
* @param $keywords
* @param $operator
* @return $this
*/
private function combineLiterals($keywords, $operator)
{
if (count($keywords) === 1) {
switch ($operator) {
case 'NOT':
$this->expression .= ' NOT "' . $keywords[0] . '" ';
return $this;
}
}
$string = '';
// do not add a leading $operator
if ($this->expression != '') {
$string = ' ' . $operator . ' ';
}
if (count($keywords) < 1) {
$string .= ' (';
}
$i = 0;
foreach ($keywords as $keyword) {
$i++;
if ($i > 1 || $operator === 'NOT') {
$string .= ' '. $operator . ' ';
}
$string .= ' '. $keyword . ' ';
}
if (count($keywords) < 1) {
$string .= ')';
}
$this->expression .= $string;
return $this;
}
/**
* @return string
*/
public function getExpression()
{
return $this->expression;
}
}