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<?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;
}
}
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