Move custom libs to the source tree

libs/SimpleValidator/Validators/Email.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace SimpleValidator\Validators;
+
+class Email extends Base
+{
+    public function execute(array $data)
+    {
+        if ($this->isFieldNotEmpty($data)) {
+
+            // I use the same validation method as Firefox
+            // http://hg.mozilla.org/mozilla-central/file/cf5da681d577/content/html/content/src/nsHTMLInputElement.cpp#l3967
+
+            $value = $data[$this->field];
+            $length = strlen($value);
+
+            // If the email address begins with a '@' or ends with a '.',
+            // we know it's invalid.
+            if ($value[0] === '@' || $value[$length - 1] === '.') {
+
+            	return false;
+            }
+
+            // Check the username
+            for ($i = 0; $i < $length && $value[$i] !== '@'; ++$i) {
+
+                $c = $value[$i];
+
+                if (! (ctype_alnum($c) || $c === '.' || $c === '!' || $c === '#' || $c === '$' ||
+                    $c === '%' || $c === '&' || $c === '\'' || $c === '*' || $c === '+' ||
+                    $c === '-' || $c === '/' || $c === '=' || $c === '?' || $c === '^' ||
+                    $c === '_' || $c === '`' || $c === '{' || $c === '|' || $c === '}' ||
+                    $c === '~')) {
+
+                    return false;
+                }
+            }
+
+            // There is no domain name (or it's one-character long),
+            // that's not a valid email address.
+            if (++$i >= $length) return false;
+            if (($i + 1) === $length) return false;
+
+            // The domain name can't begin with a dot.
+            if ($value[$i] === '.') return false;
+
+            // Parsing the domain name.
+            for (; $i < $length; ++$i) {
+
+                $c = $value[$i];
+
+                if ($c === '.') {
+
+                    // A dot can't follow a dot.
+                    if ($value[$i - 1] === '.') return false;
+                }
+                elseif (! (ctype_alnum($c) || $c === '-')) {
+
+                    // The domain characters have to be in this list to be valid.
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+}