PowerPoint2007 Writer : Fixed issue when first element in series is null

Author: devopsadmin

docs/changes/1.1.0.md

@@ -24,6 +24,7 @@
 - PowerPoint2007 Writer : Fixed column indices for embedded spreadsheets - [@michael-roth](https://github.com/michael-roth) in [#773](https://github.com/PHPOffice/PHPPresentation/pull/773)
 - PowerPoint2007 Reader : Load images from file only if valid - [@aelliott1485](https://github.com/aelliott1485) in [#775](https://github.com/PHPOffice/PHPPresentation/pull/775)
 - PowerPoint2007 Writer : Fixed broken video file relationship - [@potofcoffee](https://github.com/potofcoffee) in [#776](https://github.com/PHPOffice/PHPPresentation/pull/776)
+- PowerPoint2007 Writer : Fixed issue when first element in series is null - [@ksmeeks0001](https://github.com/ksmeeks0001) in [#778](https://github.com/PHPOffice/PHPPresentation/pull/778)
 
 ## BC Breaks
 - `PhpOffice\PhpPresentation\Style\Outline` : the width is now based on pixels (before in points)

src/PhpPresentation/Writer/PowerPoint2007/PptCharts.php

@@ -347,7 +347,16 @@ protected function writeMultipleValuesOrReference(XMLWriter $objWriter, bool $is
         // c:strLit / c:numLit
         // c:strRef / c:numRef
         $referenceType = ($isReference ? 'Ref' : 'Lit');
-        $dataType = is_numeric($values[0]) ? 'num' : 'str';
+
+        // Get data type from first non-null value
+        $dataType = array_reduce($values, function ($carry, $item) {
+            if (!isset($item)) {
+                return $carry;
+            }
+
+            return is_numeric($item) ? 'num' : 'str';
+        }, 'num');
+
         $objWriter->startElement('c:' . $dataType . $referenceType);
 
         $numValues = count($values);

tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptChartsTest.php

@@ -99,6 +99,76 @@ public function testChartDisplayBlankAs(): void
         $this->assertIsSchemaECMA376Valid();
     }
 
+    /**
+     * @dataProvider dataProviderIncludedSpreadsheet
+     */
+    public function testChartIncludeSpreadsheetNullValue(string $chartType, string $chartElementName): void
+    {
+        $seriesData = array_merge(['Z' => null], $this->seriesData);
+
+        $oSlide = $this->oPresentation->getActiveSlide();
+        $oShape = $oSlide->createChartShape();
+        $oShape->setIncludeSpreadsheet(true);
+        /** @var AbstractType $oChart */
+        $oChart = new $chartType();
+        $oSeries = new Series('Downloads', $seriesData);
+        $oChart->addSeries($oSeries);
+        $oShape->getPlotArea()->setType($oChart);
+
+        $chartBaseXmlPath = sprintf('/c:chartSpace/c:chart/c:plotArea/%s', $chartElementName);
+
+        self::assertTrue($oShape->hasIncludedSpreadsheet());
+
+        $this->assertZipFileExists('ppt/charts/' . $oShape->getIndexedFilename());
+        $this->assertZipFileExists('ppt/embeddings/' . $oShape->getIndexedFilename() . '.xlsx');
+
+        $this->assertZipFileExists('ppt/charts/_rels/' . $oShape->getIndexedFilename() . '.rels');
+        $element = '/Relationships/Relationship[@Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/package"]';
+        $this->assertZipXmlElementExists('ppt/charts/_rels/' . $oShape->getIndexedFilename() . '.rels', $element);
+
+        $element = '/p:sld/p:cSld/p:spTree/p:graphicFrame/a:graphic/a:graphicData';
+        $this->assertZipXmlElementExists('ppt/slides/slide1.xml', $element);
+        $element = $chartBaseXmlPath;
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $element = $chartBaseXmlPath . '/c:ser';
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $this->assertZipXmlElementCount('ppt/charts/' . $oShape->getIndexedFilename(), $element, 1);
+        $element = $chartBaseXmlPath . '/c:ser/c:tx/c:v';
+        $this->assertZipXmlElementNotExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $element = $chartBaseXmlPath . '/c:ser/c:tx/c:strRef';
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $element = $chartBaseXmlPath . '/c:ser/c:tx/c:strRef/c:f';
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $this->assertZipXmlElementEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'Sheet1!$B$1');
+        $element = $chartBaseXmlPath . '/c:ser/c:tx/c:strRef/c:strCache';
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $element = $chartBaseXmlPath . '/c:ser/c:tx/c:strRef/c:strCache/c:pt';
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $element = $chartBaseXmlPath . '/c:ser/c:tx/c:strRef/c:strCache/c:pt/c:v';
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $this->assertZipXmlElementEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'Downloads');
+
+        $element = $chartBaseXmlPath . '/c:ser/c:val/c:numRef/c:numCache/c:pt/c:v';
+        if ($oChart instanceof Scatter) {
+            $element = $chartBaseXmlPath . '/c:ser/c:yVal/c:numRef/c:numCache/c:pt/c:v';
+        }
+        $this->assertZipXmlElementCount('ppt/charts/' . $oShape->getIndexedFilename(), $element, count($seriesData));
+        foreach (array_values($seriesData) as $index => $value) {
+            $this->assertZipXmlElementAtIndexEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, $index, $value);
+        }
+
+        $element = '/c:chartSpace/c:externalData';
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $this->assertZipXmlAttributeExists('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'r:id');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'r:id', 'rId1');
+        $element = '/c:chartSpace/c:externalData/c:autoUpdate';
+        $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
+        $this->assertZipXmlAttributeExists('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'val');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'val', '0');
+
+        $this->assertIsSchemaECMA376Valid();
+    }
+
     /**
      * @dataProvider dataProviderIncludedSpreadsheet
      */