init enum for data type

src/enums/DatatypeEnum.php

@@ -0,0 +1,113 @@
+<?php
+namespace CSV\enums;
+
+/**
+ * Class DatatypeEnum
+ *
+ * @package CSV\enums
+ */
+class DatatypeEnum extends SplEnum {
+
+    const __DEFAULT = self::TYPE_STRING;
+
+    const TYPE_STRING = 'string';
+
+    const TYPE_FLOAT = 'float';
+
+    const TYPE_INT = 'integer';
+
+    const TYPE_BOOL = 'boolean';
+
+    const TYPE_DATE = 'date';
+
+    const REGEX_FLOAT = '/^[+-]?([0-9]*[.,])?([0-9]|[.,][0-9])+$/';
+
+    const REGEX_INT = '/^[-+]?[0-9]\d*$/';
+
+    const REGEX_BOOL = '/^(?i:true|false)$/';
+
+    /**
+     * Define validator functions here.
+     *
+     * @var array
+     */
+    private static $validators = array(
+        self::TYPE_STRING => null,
+        self::TYPE_FLOAT => 'isValidFloat',
+        self::TYPE_INT => 'isValidInteger',
+        self::TYPE_BOOL => 'isValidBoolean',
+        self::TYPE_DATE => 'isValidDate'
+    );
+
+    /**
+     * Checks data type for given string.
+     *
+     * @param $value
+     *
+     * @return bool|string
+     */
+    public static function getValidTypeFromSample($value){
+        $value = trim((string) $value);
+
+        if (empty($value)){
+            return false;
+        }
+
+        foreach (self::$validators as $type => $validator){
+            if ($validator === null){
+                continue;
+            }
+
+            if (method_exists(self, $validator)){
+                call_user_func($validator($value));
+                return $type;
+            }
+
+            return self::__DEFAULT;
+        }
+    }
+
+    /**
+     * Check if string is float value.
+     *
+     * @param $value
+     *
+     * @return false|int
+     */
+    private static function isValidFloat($value) {
+        return preg_match(self::REGEX_FLOAT, $value);
+    }
+
+    /**
+     * Check if string is integer value.
+     *
+     * @param $value
+     *
+     * @return false|int
+     */
+    private static function isValidInteger($value) {
+        return preg_match(self::REGEX_INT, $value);
+    }
+
+    /**
+     * Check if string is boolean.
+     *
+     * @param $value
+     *
+     * @return false|int
+     */
+    private static function isValidBoolean($value) {
+        return preg_match(self::REGEX_BOOL, $value);
+    }
+
+    /**
+     * Check if string is date.
+     *
+     * @param $value
+     *
+     * @return false|int
+     */
+    private static function isValidDate($value) {
+        return (bool) strtotime($value);
+    }
+}

src/extensions/DatatypeTrait.php

@@ -12,42 +12,6 @@ trait DatatypeTrait {
      */
     public $data_types = [];
 
-    /**
-     * Check data type
-     * Check for possible data types for one field value string.
-     *
-     * @access private
-     *
-     * @param string $value cell value
-     *
-     * @return string
-     */
-    private function getDatatypeFromString($value) {
-        $value = trim((string) $value);
-
-        if (empty($value)) {
-            return 'unknown';
-        }
-
-        if (preg_match('/^(?i:true|false)$/', $value)) {
-            return 'boolean';
-        }
-
-        if (preg_match('/^[-+]?[0-9]\d*$/', $value)) {
-            return 'integer';
-        }
-
-        if (preg_match('/^[+-]?([0-9]*[.])?([0-9]|[.][0-9])+$/', $value)) {
-            return 'float';
-        }
-
-        if ((bool) strtotime($value)) {
-            return 'date';
-        }
-
-        return 'string';
-    }
-
     /**
      * Check data type for one column.
      * Check for most commonly data type for one column.
@@ -59,7 +23,7 @@ trait DatatypeTrait {
      * @return string|false
      */
     private function getMostFrequentDataypeForColumn($datatypes) {
-        unset($datatypes['unknown']);
+        array_filter($datatypes);
 
         $typesFreq = array_count_values($datatypes);
         arsort($typesFreq);
@@ -85,13 +49,14 @@ trait DatatypeTrait {
         $result = [];
         foreach ($this->titles as $cName) {
             $column = array_column($this->data, $cName);
-            $cDatatypes = array_map([$this, 'getDatatypeFromString'], $column);
+
+            $cDatatypes = array_map('CSV\enums\DatatypeEnum::getValidTypeFromSample', $column);
 
             $result[$cName] = $this->getMostFrequentDataypeForColumn($cDatatypes);
         }
 
         $this->data_types = $result;
 
-        return !empty($this->data_types) ? $this->data_types : false;
+        return !empty($this->data_types) ? $this->data_types : [];
     }
 }