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wp-content/plugins/mailchimp-for-wp/includes/class-plugin.php

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+<?php
+
+/**
+ * Class MC4WP_Plugin
+ *
+ * Helper class for easy access to information like the plugin file or plugin directory.
+ * Used in MC4WP Premium.
+ *
+ * @access public
+ * @ignore
+ */
+class MC4WP_Plugin
+{
+    /**
+     * @var string The plugin version.
+     */
+    protected $version;
+
+    /**
+     * @var string The main plugin file.
+     */
+    protected $file;
+
+    /**
+     * @param string $file The plugin version.
+     * @param string $version The main plugin file.
+     */
+    public function __construct($file, $version)
+    {
+        $this->file    = $file;
+        $this->version = $version;
+    }
+
+    /**
+     * Get the main plugin file.
+     *
+     * @return string
+     */
+    public function file()
+    {
+        return $this->file;
+    }
+
+    /**
+     * Get the plugin version.
+     *
+     * @return string
+     */
+    public function version()
+    {
+        return $this->version;
+    }
+
+    /**
+     * Gets the directory the plugin lives in.
+     *
+     * @param string $path
+     *
+     * @return string
+     */
+    public function dir($path = '')
+    {
+
+        // ensure path has leading slash
+        if ('' !== $path) {
+            $path = '/' . ltrim($path, '/');
+        }
+
+        return dirname($this->file) . $path;
+    }
+
+    /**
+     * Gets the URL to the plugin files.
+     *
+     * @param string $path
+     *
+     * @return string
+     */
+    public function url($path = '')
+    {
+        return plugins_url($path, $this->file);
+    }
+}