From 3ecfea48c160b2ce9fac6b9d56ab9b1a51843714 Mon Sep 17 00:00:00 2001
From: Andreas Heigl <andreas@heigl.org>
Date: Mon, 6 Jun 2016 08:50:40 +0200
Subject: [PATCH] Adds support for page-range

---
 src/Ghostscript.php       | 44 +++++++++++++++++++++++++++++++++++++++
 tests/GhostscriptTest.php | 18 ++++++++++++++++
 2 files changed, 62 insertions(+)

diff --git a/src/Ghostscript.php b/src/Ghostscript.php
index a2644da..bb33059 100644
--- a/src/Ghostscript.php
+++ b/src/Ghostscript.php
@@ -142,6 +142,10 @@ class Ghostscript
                                           'application/ps',
                                          );
 
+    protected $pageStart = null;
+
+    protected $pageEnd = null;
+
     /**
      * Set the path to the gs-executable and return it.
      *
@@ -319,9 +323,30 @@ public function getRenderString()
         if ($this -> isGraphicsAntiAliasingSet()) {
             $string .= ' -dGraphicsAlphaBits=' . $this -> getGraphicsAntiAliasing();
         }
+
+        $string .= $this->getPageRangeString();
+
         $string .= ' "' . $this -> getInputFile() . '"';
         return $string;
     }
+
+    public function getPageRangeString()
+    {
+        if (null === $this->pageStart) {
+            return '';
+        }
+
+        $string = ' -dFirstPage=%d -dLastPage=%d';
+
+        $pageStart = $this->pageStart;
+        $pageEnd = $this->pageEnd;
+        if (null === $this->pageEnd) {
+            $pageEnd = $this->pageStart;
+        }
+
+        return sprintf($string, $pageStart, $pageEnd);
+    }
+
     /**
      * Check whether Anti ALiasing for graphics is set
      *
@@ -522,6 +547,25 @@ public function useCie()
          return (bool) $this -> _useCie;
      }
 
+    /**
+     * Set a page-Range
+     *  
+     * @param $startPage
+     * @param $endPage
+     *
+     * @return self
+     */
+    public function setPages($startPage, $endPage = null)
+    {
+        $this->pageStart = (int) $startPage;
+
+        if (null !== $endPage) {
+            $this->pageEnd = (int) $endPage;
+        }
+
+        return $this;
+    }
+
      /**
       * Store whether to use CIE for color conversion or not
       *
diff --git a/tests/GhostscriptTest.php b/tests/GhostscriptTest.php
index 7fda85c..aa312f3 100644
--- a/tests/GhostscriptTest.php
+++ b/tests/GhostscriptTest.php
@@ -200,4 +200,22 @@ public function testRendering()
         $this -> assertTrue($f -> render());
         unlink(dirname($filename) . DIRECTORY_SEPARATOR . 'output.png');
     }
+
+    public function testSettingPages()
+    {
+        $f = new Ghostscript();
+        $this->assertAttributeEquals(null, 'pageStart', $f);
+        $this->assertAttributeEquals(null, 'pageEnd', $f);
+        $this->assertEmpty($f->getPageRangeString());
+
+        $f->setPages(2);
+        $this->assertAttributeEquals(2, 'pageStart', $f);
+        $this->assertAttributeEquals(null, 'pageEnd', $f);
+        $this->assertEquals(' -dFirstPage=2 -dLastPage=2', $f->getPageRangeString());
+
+        $f->setPages(3,4);
+        $this->assertAttributeEquals(3, 'pageStart', $f);
+        $this->assertAttributeEquals(4, 'pageEnd', $f);
+        $this->assertEquals(' -dFirstPage=3 -dLastPage=4', $f->getPageRangeString());
+    }
 }