add trait for row to string converting without file

src/CsvRowUtil.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * TODO:
+ *
+ */
+
+namespace Keboola\Csv;
+
+
+trait CsvRowUtil
+{
+    /**
+     * @param array $row
+     * @return string
+     * @throws Exception
+     */
+    public function rowToStr(array $row)
+    {
+        $return = [];
+        foreach ($row as $column) {
+            if (!(
+                is_scalar($column)
+                || is_null($column)
+                || (
+                    is_object($column)
+                    && method_exists($column, '__toString')
+                )
+            )) {
+                throw new Exception(
+                    "Cannot write data into column: " . var_export($column, true),
+                    Exception::WRITE_ERROR
+                );
+            }
+
+            $return[] = $this->getEnclosure() .
+                str_replace($this->getEnclosure(), str_repeat($this->getEnclosure(), 2), $column) .
+                $this->getEnclosure();
+        }
+        return implode($this->getDelimiter(), $return) . $this->getLineBreak();
+    }
+
+    /**
+     * TODO:
+     *
+     * @return mixed
+     */
+    abstract protected function getDelimiter();
+
+    /**
+     * TODO:
+     *
+     * @return mixed
+     */
+    abstract protected function getLineBreak();
+
+    /**
+     * TODO:
+     *
+     * @return mixed
+     */
+    abstract protected function getEnclosure();
+
+}

src/CsvWriter.php

@@ -4,6 +4,8 @@
 
 class CsvWriter extends AbstractCsvFile
 {
+    use CsvRowUtil;
+
     /**
      * @var string
      */
@@ -97,33 +99,14 @@ public function writeRow(array $row)
         }
     }
 
+
     /**
-     * @param array $row
-     * @return string
-     * @throws Exception
+     * TODO:
+     *
+     * @return mixed
      */
-    public function rowToStr(array $row)
+    protected function getLineBreak()
     {
-        $return = [];
-        foreach ($row as $column) {
-            if (!(
-                is_scalar($column)
-                || is_null($column)
-                || (
-                    is_object($column)
-                    && method_exists($column, '__toString')
-                )
-            )) {
-                throw new Exception(
-                    "Cannot write data into column: " . var_export($column, true),
-                    Exception::WRITE_ERROR
-                );
-            }
-
-            $return[] = $this->getEnclosure() .
-                str_replace($this->getEnclosure(), str_repeat($this->getEnclosure(), 2), $column) .
-                $this->getEnclosure();
-        }
-        return implode($this->getDelimiter(), $return) . $this->lineBreak;
+        return $this->lineBreak;
     }
 }