<?php

class Qs_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(array('-', '_'), ' ', $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($delimiters) != 2) {
            trigger_error('Delimiters argument must be 2 characters string', E_USER_WARNING);
            return false;
        }
        // remove optional containers which have at least one empty placeholder, e.g: "[{prefix}Title: {title}]" to ""
        foreach ($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;
    }
}