Re-add support for reading nested tables

This commit re-adds supports for nested tables as provided by @mathieuweber  in PR #571

Author: Luke Lanchester

src/PhpWord/Reader/Word2007/AbstractPart.php

@@ -376,6 +376,8 @@ protected function readTable(XMLReader $xmlReader, DOMElement $domNode, $parent,
                         foreach ($cellNodes as $cellNode) {
                             if ('w:p' == $cellNode->nodeName) { // Paragraph
                                 $this->readParagraph($xmlReader, $cellNode, $cell, $docPart);
+                            } elseif ($cellNode->nodeName == 'w:tbl') { // Table
+                                $this->readTable($xmlReader, $cellNode, $cell, $docPart);
                             }
                         }
                     }

tests/PhpWordTests/Reader/Word2007/ElementTest.php

@@ -277,6 +277,38 @@ public function testReadTitleStyle(): void
         self::assertInstanceOf('PhpOffice\PhpWord\Element\TextRun', $formattedTitle->getText());
     }
 
+    /**
+     * Test reading of nested table
+     */
+    public function testReadNestedTable()
+    {
+        $documentXml = '<w:tbl>
+          <w:tr>
+            <w:tc>
+              <w:tbl>
+                <w:tr>
+                  <w:tc>
+                    <w:p>
+                      <w:t>${Field}</w:t>
+                    </w:p>
+                  </w:tc>
+                </w:tr>
+              </w:tbl>
+              <w:p />
+            </w:tc>
+          </w:tr>
+        </w:tbl>';
+
+        $phpWord = $this->getDocumentFromString(array('document' => $documentXml));
+
+        $section = $phpWord->getSection(0);
+        $table = $section->getElement(0);
+        $rows = $table->getRows();
+        $cells = $rows[0]->getCells();
+        $nestedTable = $cells[0]->getElement(0);
+        $this->assertInstanceOf('PhpOffice\PhpWord\Element\Table', $nestedTable);
+    }
+
     /**
      * Test reading Drawing.
      */