diff --git a/src/file/csv/CsvReader.php b/src/file/csv/CsvReader.php
index 5ea0c8b..7177a80 100644
--- a/src/file/csv/CsvReader.php
+++ b/src/file/csv/CsvReader.php
@@ -4,6 +4,8 @@ namespace nur\sery\file\csv;
 use nur\sery\file\FileReader;
 
 class CsvReader extends AbstractReader {
+  use TAbstractReader;
+
   function getIterator() {
     $reader = new FileReader($this->input);
     while (($row = $reader->fgetcsv()) !== null) {
diff --git a/src/file/csv/IReader.php b/src/file/csv/IReader.php
index c944aad..99fa5d3 100644
--- a/src/file/csv/IReader.php
+++ b/src/file/csv/IReader.php
@@ -3,5 +3,5 @@ namespace nur\sery\file\csv;
 
 use IteratorAggregate;
 
-interface IReader extends  IteratorAggregate {
+interface IReader extends IteratorAggregate {
 }
diff --git a/src/file/csv/SsReader.php b/src/file/csv/SsReader.php
index 151b971..0321b83 100644
--- a/src/file/csv/SsReader.php
+++ b/src/file/csv/SsReader.php
@@ -11,13 +11,7 @@ use PhpOffice\PhpSpreadsheet\IOFactory;
 use PhpOffice\PhpSpreadsheet\RichText\RichText;
 
 class SsReader extends AbstractReader {
-  static function with(Upload $upload): IReader {
-    if ($upload->isExt(".csv")) {
-      return new CsvReader($upload->tmpName);
-    } else {
-      return new static($upload->tmpName);
-    }
-  }
+  use TAbstractReader;
 
   const DATETIME_FORMAT = 'dd/mm/yyyy hh:mm:ss';
   const DATE_FORMAT = 'dd/mm/yyyy';
@@ -66,6 +60,11 @@ class SsReader extends AbstractReader {
 
   protected ?string $wsname;
 
+  function setWsname(?string $wsname): self {
+    $this->wsname = $wsname;
+    return $this;
+  }
+
   function getIterator() {
     $ss = IOFactory::load($this->input);
     $ws = wsutils::get_ws($this->wsname, $ss);
diff --git a/src/file/csv/TAbstractReader.php b/src/file/csv/TAbstractReader.php
new file mode 100644
index 0000000..40345fb
--- /dev/null
+++ b/src/file/csv/TAbstractReader.php
@@ -0,0 +1,29 @@
+<?php
+namespace nur\sery\file\csv;
+
+use nur\sery\file\web\Upload;
+use nur\sery\os\path;
+use nur\sery\ValueException;
+
+trait TAbstractReader {
+  /** @param Upload|string|array */
+  static function with($reader): self {
+    if ($reader instanceof self) return $reader;
+    $class = null;
+    if ($reader instanceof Upload) {
+      if ($reader->isExt(".csv")) $class = CsvReader::class;
+      else $class = static::class;
+      return $class($reader->tmpName);
+    }
+    if (is_string($reader)) $reader = ["input" => $reader];
+    if (!is_array($reader)) {
+      throw ValueException::invalid_type($reader, self::class);
+    }
+    $input = $reader["input"] ?? null;
+    if (is_string($input) && path::ext($input) === ".csv") {
+      $class = CsvReader::class;
+    }
+    if ($class === null) $class = static::class;
+    return $class($reader);
+  }
+}