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contributions/text.placeholders/lib/helpers/textplaceholders.cls.php

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<?php
/**
 * Collects and processes placeholders
 * 
 * @author Gerd Riesselmann
 * @ingroup Placeholders
 */
class TextPlaceholders {
        /**
         * Placeholders
         * 
         * @var array
         */
        private static $placeholders = array();
        
        /**
         * Add a placeholder to list of placeholders
         * 
         * @params ITextPlaceholder $placeholder
         * @params bool $to_front If true, placehodler is prepended to list, else it is appended
         */
        public static function add(ITextPlaceholder $placeholder, $to_front = false) {
                if ($to_front) {
                        array_unshift(self::$placeholders, $placeholder);
                }
                else {
                        self::$placeholders[] = $placeholder;
                }
        } 
        
        /**
         * Apply placeholders to given text
         * 
         * @params string $text
         * @return string
         */
        public static function apply($text) {
                $ret = $text;
                foreach(self::$placeholders as $placeholder) {
                        $ret = $placeholder->apply($ret);
                }
                return $ret;
        }
}

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