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<?php
declare(strict_types = 1);
namespace iio\libmergepdf;
/**
* Parse page numbers from string
*/
final class Pages implements PagesInterface
{
/**
* @var int[] Added integer page numbers
*/
private $pages = [];
/**
* Parse page numbers from expression string
*
* Pages should be formatted as 1,3,6 or 12-16 or combined. Note that pages
* are merged in the order that you provide them. If you put pages 12-14
* before 1-5 then 12-14 will be placed first.
*/
public function __construct(string $expressionString = '')
{
$expressions = explode(
',',
str_replace(' ', '', $expressionString)
);
foreach ($expressions as $expr) {
if (empty($expr)) {
continue;
}
if (ctype_digit($expr)) {
$this->addPage((int)$expr);
continue;
}
if (preg_match("/^(\d+)-(\d+)/", $expr, $matches)) {
$this->addRange((int)$matches[1], (int)$matches[2]);
continue;
}
throw new Exception("Invalid page number(s) for expression '$expr'");
}
}
/**
* Add a single page
*/
public function addPage(int $page): void
{
$this->pages[] = $page;
}
/**
* Add a range of pages
*/
public function addRange(int $start, int $end): void
{
$this->pages = array_merge($this->pages, range($start, $end));
}
public function getPageNumbers(): array
{
return $this->pages;
}
}
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