<?php

require_once 'core/search/htmlhelper.php';
/**
 * Функции для проверки орфографии
 * rename Spell -> SpellHelper ??
 */
class Spell
{
    private $pspell;
    public  $autocorrect = false;  
    public function __construct ($language, $encoding)
    {    
        $this->pspell = pspell_new($language, '', '', $encoding, PSPELL_NORMAL);
    }

    function spellCheckWord ($word)
    {
        $word = $word[0];
        
        // Ignore ALL CAPS
        if (preg_match('/^[A-Z0-9]*$/', $word)) return $word;
    
        // Return dictionary words
        if (pspell_check($this->pspell, $word))
            return $word;
    
        // Auto-correct with the first suggestion, color green
        if ($this->autocorrect && $suggestions = pspell_suggest($this->pspell, $word))
            return '<span class="spell-suggest">' . current($suggestions) . '</span>';
        
        // No suggestions, color red
        return '<span class="spell-nosuggest">' . $word . '</span>';
    }
    
    function isGoodWord ($word)
    {
        // Ignore ALL CAPS
        if (preg_match('/^[A-Z]*$/', $word)) return true;
        if (preg_match('/^[0-9]*$/', $word)) return true;
    
        // Return dictionary words
        if (pspell_check($this->pspell, $word))
            return true;

        return false;
    }

    function suggest ($string)
    {
        return preg_replace_callback('/\b\w+\b/', array($this, 'spellCheckWord'), $string);
    }

    /**
     * Вызывает функцию для каждого найденного слова
     */
    function eachWord ($call, $string)
    {
        $begin = indexLeft ($string, 'ctype_alpha', 0);
        while ($begin !== false) {
            $end = indexLeft ($string, 'not_ctype_alpha', $begin);
            call_user_func ($call, $string, $begin, $end);
            $begin = indexLeft ($string, 'ctype_alpha', $end);
        }
        return false;
    }
    
    /**
     * Проверяет слово на соответствие со словарем
     *
     */
    function doWord (&$string, $begin, $end)
    {
        $word = substr($string, $begin, $end - $begin);
        if (! $this->isGoodWord ($word)) {
            $start = max(indexLeft ($string, 'not_ctype_alpha', $begin - 100), 0);
            $offset = indexLeft ($string, 'not_ctype_alpha', $end + 100);
            if (! $offset) {
                $offset = strlen($string);
            } 
            $length = $offset - $start;
            throw new Exception ($this->suggest(substr($string, $start, $length)));
        }
    }

    /**
     * Часть текста содержащий неправильное слово
     */
    function getError ($string)
    {
        try {
            self::eachWord (array ($this, 'doWord'), $string);
        } catch (Exception $e) {
            return $e->getMessage();
        }
        return false;
    }
}

?>