PhabricatorSlug.php
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	<?php

	final class PhabricatorSlug {

	public static function normalize($slug) {

	// TODO: We need to deal with unicode at some point, this is just a very
	// basic proof-of-concept implementation.

	$slug = strtolower($slug);
	$slug = preg_replace('@/+@', '/', $slug);
	$slug = trim($slug, '/');
	$slug = preg_replace('@[^a-z0-9/]+@', '_', $slug);
	$slug = trim($slug, '_');

	return $slug.'/';
	}

	public static function getDefaultTitle($slug) {
	$parts = explode('/', trim($slug, '/'));
	$default_title = end($parts);
	$default_title = str_replace('_', ' ', $default_title);
	$default_title = ucwords($default_title);
	$default_title = nonempty($default_title, 'Untitled Document');
	return $default_title;
	}

	public static function getAncestry($slug) {
	$slug = self::normalize($slug);

	if ($slug == '/') {
	return array();
	}

	$ancestors = array(
	'/',
	);

	$slug = explode('/', $slug);
	array_pop($slug);
	array_pop($slug);

	$accumulate = '';
	foreach ($slug as $part) {
	$accumulate .= $part.'/';
	$ancestors[] = $accumulate;
	}

	return $ancestors;
	}

	public static function getDepth($slug) {
	$slug = self::normalize($slug);
	if ($slug == '/') {
	return 0;
	} else {
	return substr_count($slug, '/');
	}
	}

	}