Row objects and Cell styling

This commit introduces Row and Cell entities, that will replace the arrays passed in previously.
It also adds support for Cell styling (instead of Row styling only).

src/Spout/Writer/CSV/Writer.php

@@ -5,6 +5,7 @@ namespace Box\Spout\Writer\CSV;
 use Box\Spout\Common\Exception\IOException;
 use Box\Spout\Common\Helper\EncodingHelper;
 use Box\Spout\Writer\Common\Entity\Options;
+use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\WriterAbstract;
 
 /**
@@ -78,20 +79,18 @@ class Writer extends WriterAbstract
     }
 
     /**
-     * Adds data to the currently opened writer.
+     * Adds a row to the currently opened writer.
      *
-     * @param  array $dataRow Array containing data to be written.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param \Box\Spout\Writer\Common\Entity\Style\Style $style Ignored here since CSV does not support styling.
-     * @throws \Box\Spout\Common\Exception\IOException If unable to write data
+     * @param Row $row The row containing cells and styles
+     * @throws IOException If unable to write data
      * @return void
      */
-    protected function addRowToWriter(array $dataRow, $style)
+    protected function addRowToWriter(Row $row)
     {
         $fieldDelimiter = $this->optionsManager->getOption(Options::FIELD_DELIMITER);
         $fieldEnclosure = $this->optionsManager->getOption(Options::FIELD_ENCLOSURE);
 
-        $wasWriteSuccessful = $this->globalFunctionsHelper->fputcsv($this->filePointer, $dataRow, $fieldDelimiter, $fieldEnclosure);
+        $wasWriteSuccessful = $this->globalFunctionsHelper->fputcsv($this->filePointer, $row->getCells(), $fieldDelimiter, $fieldEnclosure);
         if ($wasWriteSuccessful === false) {
             throw new IOException('Unable to write data');
         }