/**
 * The MIT License (MIT)
 * 
 * Copyright (c) 2015 Camil Staps
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
implementation module StringUtils

import StdEnv

strlen :: String -> Int
strlen s = length s`
where
    s` :: [Char]
    s` = fromString s

pad_right :: Char String Int -> String
pad_right c s l
| strlen s >= l = s
| otherwise = s +++ toString (repeatn (l - strlen s) c)

pad_left :: Char String Int -> String
pad_left c s l
| strlen s >= l = s
| otherwise = toString (repeatn (l - strlen s) c) +++ s

join :: String [String] -> String
join glue [] = ""
join glue [s] = s
join glue [s:ss] = s +++ glue +++ join glue ss

repl :: a b c -> String | toString a & toString b & toString c
repl needle replment haystack
| strlen needle` > strlen haystack` = haystack`
| needle` == haystack` % (0,strlen needle` - 1) = replment` +++ repl needle` replment` (haystack` % (strlen needle`, strlen haystack` - 1))
| otherwise = (haystack` % (0,0)) +++ repl needle` replment` (haystack` % (1, strlen haystack` - 1))
where
    needle` = toString needle
    replment` = toString replment
    haystack` = toString haystack