/**
* Builds a link from the string and adds it to the builder
*
* String template:
* [one] Target [as property] on field [=> alias] [, field [=> alias]]
*
* Example:
* Tweets as tweets on twitter_username => username
*
* @param Atomik_Model_Builder $builder
* @param string $string
*/
public static function addLinkFromString(Atomik_Model_Builder $builder, $string)
{
$regexp = '/^((?P<type>one)\s+|)(?P<target>.+)((\sas\s(?P<as>.+))|)\s+on\s+(?P<on>.+)$/U';
if (!preg_match($regexp, $string, $matches)) {
require_once 'Atomik/Model/Builder/Exception.php';
throw new Atomik_Model_Builder_Exception('Link string is malformed: ' . $string);
}
$link = new Atomik_Model_Builder_Link();
$link->type = $matches['type'] == 'one' ? 'one' : 'many';
$link->target = trim($matches['target']);
$link->name = $link->target;
if (isset($matches['as']) && !empty($matches['as'])) {
$link->name = trim($matches['as']);
}
$fields = explode(',', $matches['on']);
foreach ($fields as $field) {
if (!preg_match('/^(?P<name>.+)(\s+=\>\s(?P<alias>.+)|)$/U', trim($field), $fieldMatches)) {
require_once 'Atomik/Model/Builder/Exception.php';
throw new Atomik_Model_Builder_Exception('Field definition in link string is malformed: ' . $string);
}
$alias = isset($fieldMatches['alias']) ? $fieldMatches['alias'] : $fieldMatches['name'];
$link->fields[$alias] = $fieldMatches['name'];
}
$builder->addLink($link);
}
