<?php

class Tools_String {

    // from creole
    static function strToArray($str) {
    	$str = substr($str, 1, -1); // remove { }
    	$res = array();
    	
    	$subarr = array();
    	$in_subarr = 0;
    	
    	$toks = explode(',', $str);
    	foreach($toks as $tok) {					
    		if ($in_subarr > 0) { // already in sub-array?
    			$subarr[$in_subarr][] = $tok;
    			if ('}' === substr($tok, -1, 1)) { // check to see if we just added last component					
	    			$res[] = static::strToArray(implode(',', $subarr[$in_subarr]));
    				$in_subarr--;
    			}
    		} elseif ($tok{0} === '{') { // we're inside a new sub-array							   
        			if ('}' !== substr($tok, -1, 1)) {
    				$in_subarr++;
    				// if sub-array has more than one element
    				$subarr[$in_subarr] = array();
    				$subarr[$in_subarr][] = $tok;					
    			} else {
    				$res[] = static::strToArray($tok);
    			}
	    	} else { // not sub-array
    			$val = trim($tok, '"'); // remove " (surrounding strings)
    			// perform type castng here?
        			$res[] = $val;
    		}
    	}
    	
    	return $res;
    }

    //Нормализация строк на русском
    static function normalizeRussian($str) {
        $result = preg_replace('/\s+/',' ', $str);
        if (is_string($result)) {
        	$result = trim($result); //Замена длинных пробелов на одинарные, пробелы по краям
        	$result = mb_strtolower($result);
        	$result = preg_replace('/ё/','е', $str); //е на ё
        }
    	return $result;
    }
    
    //Проверка равенства двух строк на русском языке.
    static function equalRussianCheck($str1,$str2) {
    	return self::normalizeRussian($str1) == self::normalizeRussian($str2);
    }
    

    /**
     * Попадает ли строка в список вариантов
     * input:  $str="foo1" $variants="foo1|foo2|foo3"
     * output: true
     * input:  $str="foo" $variants="foo1|foo2|foo3"
     * output: false
*/      
    static function compare_string_to_variants($str, $variants){
        $variants_array = explode('|', $variants);
        $founded = false;
        foreach ($variants_array as $variant) {
                $founded = $founded || self::equalRussianCheck($variant, $str);
        }
        return  $founded;
    }
    
    static function mb_str_split($str) {
        return preg_split('~~u', $str, null, PREG_SPLIT_NO_EMPTY);
    }
    
    static function mb_strtr($str, $from, $to) {
        return str_replace(self::mb_str_split($from), self::mb_str_split($to), $str);
    }       
    
    static function encodestring($st) {
        $st = self::mb_strtr($st,"абвгдеёзийклмнопрстуфхъыэ !+-()", "abvgdeeziyklmnoprstufh_ie______");
        $st = self::mb_strtr($st,"АБВГДЕЁЗИЙКЛМНОПРСТУФХЪЫЭ", "ABVGDEEZIYKLMNOPRSTUFH_IE");
        $st = strtr($st, array(
                        " " => '_',
                        "." => '_',
                        "," => '_',
                            "?" => '_',
                        "\"" => '_',
                        "'" => '_',
                        "/" => '_',
                        "\\" => '_',
                        "%" => '_',
                        "#" => '_',
                        "*" => '_',
                        "ж"=>"zh", "ц"=>"ts", "ч"=>"ch", "ш"=>"sh",
                            "щ"=>"shch","ь"=>"", "ю"=>"yu", "я"=>"ya",
                        "Ж"=>"ZH", "Ц"=>"TS", "Ч"=>"CH", "Ш"=>"SH", 
                        "Щ"=>"SHCH","Ь"=>"", "Ю"=>"YU", "Я"=>"YA",
                        "Й"=>"i", "й"=>"ie", "ё"=>"Ye",
                        "№"=>"N"
                        ));
        return strtolower($st);
    }

    static function validate_encoded_string($st) {
        $enc_st = self::encodestring($st);
        return preg_match('/^[\w_-]+(\.[\w_-]+)?$/', $enc_st);
    }
}