<?php

class Qs_String
{
    public static function aliasize($string)
    {
        $string = static::dasherize($string);
        $string = preg_replace('/[^-_a-zA-Z0-9\.]+/', '-', $string);
        $string = preg_replace('/-+/', '-', $string);
        $string = strtolower($string);
        $string = trim($string, '-');
        return $string;
    }

    public static function decamelize($string)
    {
        return ucfirst(preg_replace('/([a-z])([A-Z])/', '$1 $2', $string));
    }

    public static function camelize($string)
    {
        $string = str_replace(['-', '_'], ' ', $string);
        $string = ucwords($string);
        return str_replace(' ', '', $string);
    }

    public static function dasherize($string)
    {
        return strtolower(preg_replace('/([a-z])([A-Z])/', '$1-$2', $string));
    }

    public static function fill($string, array $placeholders, $delimiters = '{}')
    {
        if (!is_string($delimiters) || strlen($delimiters) != 2) {
            trigger_error('Delimiters argument must be 2 characters string', E_USER_WARNING);
            return false;
        }
        $placeholders = array_filter($placeholders, function ($value) {
            return null === $value || is_scalar($value);
        });
        // remove optional containers which have at least one empty placeholder, e.g: "[{prefix}Title: {title}]" to ""
        foreach ($placeholders as $name => $value) {
            $placeholder = $delimiters[0] . $name . $delimiters[1];
            if (empty($value)) {
                $string = preg_replace('/\[[^\[]*' . preg_quote($placeholder) . '[^\]]*\]/', '', $string);
            }
        }
        foreach ($placeholders as $name => $value) {
            $placeholder = $delimiters[0] . $name . $delimiters[1];
            // remove optional marks for nonempty placeholder, e.g: "[{prefix}Title: {title}]" to "{prefix}Title: {title}"
            if (!empty($value)) {
                $string = preg_replace('/(\[)([^\[]*' . preg_quote($placeholder) . '[^\]]*)(\])/', '$2', $string);
            }
            $string = str_replace($placeholder, $value, $string);
        }
        return $string;
    }

    public static function toHex($string)
    {
        $hex = unpack('H*', $string);
        return array_shift($hex);
    }

    public static function truncate($string, $length = 80, $etc = '...', $break_words = false, $middle = false)
    {
        require_once 'lib/Smarty/Smarty/plugins/modifier.truncate.php';
        return smarty_modifier_truncate($string, $length, $etc, $break_words, $middle);
    }

    public static function strip_tags($string)
    {
        $string = strip_tags($string);
        $string = str_replace(
            [
                '&nbsp;',  '&#160;',
                '&lt;',    '&#60;',
                '&gt;',    '&#62;',
                '&amp;',   '&amp;',
                '&quot;',  '&#34;',
                '&apos;',  '&#39;',
                '&cent;',  '&#162;',
                '&pound;', '&#163;',
                '&yen;',   '&#165;',
                '&euro;',  '&#8364;',
                '&copy;',  '&#169;',
                '&reg;',   '&#174;',
            ],
            [
                ' ', ' ',
                '<', '<',
                '>', '>',
                '&', '&',
                '"', '"',
                '\'', '\'',
                '¢', '¢',
                '£', '£',
                '¥', '¥',
                '€', '€',
                '©', '©',
                '®', '®',
            ],
            $string
        );
        return $string;
    }
}