SilverStripe overwriting URLSegmentFilter static - php

Question

URLSegmentFilter has a static array $default_replacements which holds, among others, the string to convert ampersands to (from & to -and-) for URL's.
I'm trying to extend the class and overwrite this static to translate the ampersand convert (only value is english and).
How can I overwrite the owner static for this goal?
class URLSegmentFilterExtension extends Extension {
private static $default_replacements = array(
'/&/u' => '-and-', // I need to translate this using _t()
'/&/u' => '-and-', // And this one
'/\s|\+/u' => '-',
'/[_.]+/u' => '-',
'/[^A-Za-z0-9\-]+/u' => '',
'/[\/\?=#]+/u' => '-',
'/[\-]{2,}/u' => '-',
'/^[\-]+/u' => '',
'/[\-]+$/u' => ''
);
}

Answer 1

First of all: The URLSegmentFilter mainly operates in the CMS context, where you usually just have a single locale (depending on the settings of the editing Member). So using _t() alone might not be very helpful? So you'd probably have to get the current editing locale (assuming you're using Fluent or Translatable) and set the locale for translations temporarily.
I don't see a way to hook in translations via an Extension there. I think you'd be better off creating a custom subclass and use it via Injector.
Something like this should work:
<?php
class TranslatedURLSegmentFilter extends URLSegmentFilter
{
public function getReplacements()
{
$currentLocale = i18n::get_locale();
$contentLocale = Translatable::get_current_locale();
// temporarily set the locale to the content locale
i18n::set_locale($contentLocale);
$replacements = parent::getReplacements();
// merge in our custom replacements
$replacements = array_merge($replacements, array(
'/&/u' => _t('TranslatedURLSegmentFilter.UrlAnd', '-and-'),
'/&/u' => _t('TranslatedURLSegmentFilter.UrlAnd', '-and-')
));
// reset to CMS locale
i18n::set_locale($currentLocale);
return $replacements;
}
}
Then you have to enable the custom URLSegmentFilter via config by putting something like this in your mysite/_config/config.yml file:
Injector:
URLSegmentFilter:
class: TranslatedURLSegmentFilter
Update: The above example assumes you're using the Translatable module. If you're using Fluent, replace the following line:
$contentLocale = Translatable::get_current_locale();
with:
$contentLocale = Fluent::current_locale();

Answer 2

You can update configuration dynamically in mysite/_config.php
$defaultReplacements = Config::inst()->get('URLSegmentFilter', 'default_replacements');
$translatedAnd = _t('URLSegmentFilter.And','-and-');
$defaultReplacements['/&/u'] = $translatedAnd;
$defaultReplacements['/&/u'] = $translatedAnd;
Config::inst()->Update('URLSegmentFilter', 'default_replacements', $defaultReplacements);