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<?php
/**
 * This file contains the keyhighlighter class that highlights the chosen keyword in the current output buffer.
 *
 * @category    ICMS
 * @package     Ipf
 * @subpackage  Keyhighlighter
 */

/**
 * keyhighlighter class
 *
 * This class highlight the chosen keywords in the current output buffer
 *
 * @category    ICMS
 * @package     Ipf
 * @subpackage  Keyhighlighter
 * @author      Setec Astronomy
 * @version     1.0
 * @abstract    Highlight specific keywords.
 * @copyright   2004
 * @link        http://setecastronomy.stufftoread.com
 */
class icms_ipf_Highlighter {

    /**
     * @access private
     */
    private $preg_keywords = '';
    /**
     * @access private
     */
    private $keywords = '';
    /**
     * @access private
     */
    private $singlewords = false;
    /**
     * @access private
     */
    private $replace_callback = null;

    public $content;

    /**
     * Main constructor
     *
     * This is the main constructor of keyhighlighter class. <br />
     * It's the only public method of the class.
     * @param string $keywords the keywords you want to highlight
     * @param boolean $singlewords specify if it has to highlight also the single words.
     * @param callback $replace_callback a custom callback for keyword highlight.
     * <code>
     * <?php
     * require 'keyhighlighter.class.php' ;
     *
     * function my_highlighter ($matches) {
     *  return '<span style="font-weight: bolder; color: #FF0000;">' . $matches[0] . '</span>';
     * }
     *
     * new keyhighlighter ('W3C', false, 'my_highlighter');
     * readfile ('http://www.w3c.org/');
     *
     * </code>
     */
    public function __construct($keywords, $singlewords = false, $replace_callback = null) {
        $this->keywords = $keywords;
        $this->singlewords = $singlewords;
        $this->replace_callback = $replace_callback;
    }

    /**
     * @access private
     */
    private function replace($replace_matches) {

        $patterns = array();
        if ($this->singlewords) {
            $keywords = explode(' ', $this->preg_keywords);
            foreach ($keywords as $keyword) {
                $patterns[] = '/(?' . '>' . $keyword . '+)/si';
            }
        } else {
            $patterns[] = '/(?' . '>' . $this->preg_keywords . '+)/si';
        }

        $result = $replace_matches[0];

        foreach ($patterns as $pattern) {
            if (!is_null($this->replace_callback)) {
                $result = preg_replace_callback($pattern, $this->replace_callback, $result);
            } else {
                $result = preg_replace($pattern, '<span class="highlightedkey">\\0</span>', $result);
            }
        }

        return $result;
    }

    /**
     * @access private
     */
    private function highlight($buffer) {
        $buffer = '>' . $buffer . '<';
        $this->preg_keywords = preg_replace('/[^\w ]/si', '', $this->keywords);
        $buffer = preg_replace_callback ("/(\>(((?" . ">[^><]+)|(?R))*)\<)/is", array(&$this, 'replace'), $buffer);
        $buffer = substr($buffer, 1, -1);
        return $buffer;
    }
}