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/Common/Manager/Style/StyleManager.php

@@ -2,6 +2,7 @@
 
 namespace Box\Spout\Writer\Common\Manager\Style;
 
+use Box\Spout\Writer\Common\Entity\Cell;
 use Box\Spout\Writer\Common\Entity\Style\Style;
 
 /**
@@ -48,13 +49,12 @@ class StyleManager implements StyleManagerInterface
      * Apply additional styles if the given row needs it.
      * Typically, set "wrap text" if a cell contains a new line.
      *
-     * @param Style $style The original style
-     * @param array $dataRow The row the style will be applied to
-     * @return Style The updated style
+     * @param Cell $cell
+     * @return Style
      */
-    public function applyExtraStylesIfNeeded($style, $dataRow)
+    public function applyExtraStylesIfNeeded(Cell $cell)
     {
-        $updatedStyle = $this->applyWrapTextIfCellContainsNewLine($style, $dataRow);
+        $updatedStyle = $this->applyWrapTextIfCellContainsNewLine($cell);
 
         return $updatedStyle;
     }
@@ -68,24 +68,22 @@ class StyleManager implements StyleManagerInterface
      *        A workaround would be to encode "\n" as "_x000D_" but it does not work
      *        on the Windows version of Excel...
      *
-     * @param Style $style The original style
-     * @param array $dataRow The row the style will be applied to
-     * @return Style The eventually updated style
+     * @param Cell $cell The cell the style should be applied to
+     * @return \Box\Spout\Writer\Common\Entity\Style\Style The eventually updated style
      */
-    protected function applyWrapTextIfCellContainsNewLine($style, $dataRow)
+    protected function applyWrapTextIfCellContainsNewLine(Cell $cell)
     {
+        $cellStyle = $cell->getStyle();
+
         // if the "wrap text" option is already set, no-op
-        if ($style->hasSetWrapText()) {
-            return $style;
+        if ($cellStyle->hasSetWrapText()) {
+            return $cellStyle;
         }
 
-        foreach ($dataRow as $cell) {
-            if (is_string($cell) && strpos($cell, "\n") !== false) {
-                $style->setShouldWrapText();
-                break;
-            }
+        if ($cell->isString() && strpos($cell->getValue(), "\n") !== false) {
+            $cellStyle->setShouldWrapText();
         }
 
-        return $style;
+        return $cellStyle;
     }
 }