1 files changed, 67 insertions, 0 deletions
diff --git a/vendor/iio/libmergepdf/src/Pages.php b/vendor/iio/libmergepdf/src/Pages.php
new file mode 100644
index 0000000..7675315
--- /dev/null
+++ b/vendor/iio/libmergepdf/src/Pages.php
@@ -0,0 +1,67 @@
+<?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;
+    }
+}