Better booleans parsing

Author: kop

lib/index.js

@@ -1,7 +1,7 @@
 /**
  * This class is responsible for 12-factor config parsing.
  */
-class TwelveConfig {
+class ConfigParser {
 
   /**
    * Class constructor.
@@ -68,7 +68,7 @@ class TwelveConfig {
    */
   boolean(name, defaultValue = undefined) {
     const value = this.val(name, defaultValue);
-    return (value === null) ? null : Boolean(value);
+    return (value === null) ? null : ConfigParser.parseBooleanValue(value);
   }
 
   /**
@@ -94,6 +94,17 @@ class TwelveConfig {
 
     return value;
   }
+
+  /**
+   * Parse string and extract boolean from it.
+   *
+   * @param {String} value - Value to parse.
+   * @return {Boolean} Operation result.
+   */
+  static parseBooleanValue(value) {
+    const trueValues = ['true', 't', 'yes', 'y', 'on', '1'];
+    return (trueValues.indexOf(String(value).toLowerCase()) >= 0);
+  }
 }
 
-module.exports = TwelveConfig;
+module.exports = ConfigParser;