utils.swift

//
//  utils.swift
//  md_bgmasset
//
//  Created by oropon on 6/11/14.
//  Copyright (c) 2014 oropon. All rights reserved.
//

extension Array {
    func any(p: (T) -> Bool) -> Bool {
        for x in self {
            if p(x) {
                return true
            }
        }
        return false
    }
}

func strip(cs: String) -> String{
    let whitespaces :Array<Character> = [" ", "\t", "\n", "\r"]

    func stripl(cs: String) -> String {
        var ix :String.Index
        for ix = cs.startIndex; ix != cs.endIndex; ix = ix.succ() {
            if !whitespaces.any({cs[ix] == $0}) {
                break
            }
        }
        return cs[ix..cs.endIndex]
    }

    func stripr(cs: String) -> String {
        var ix :String.Index
        for ix = cs.endIndex.pred(); ix != cs.startIndex; ix = ix.pred() {
            if !whitespaces.any({cs[ix] == $0}) {
                break
            }
        }
        return cs[cs.startIndex...ix]
    }

    return stripl(stripr(cs))
}

class Stack<T> {
    var array :Array<T> = T[]()
    func stack(e: T)  {
        array.append(e)
    }
    func pop(e: T) -> T? {
        if self.isEmpty() {return nil}
        return array.removeLast()
    }
    func peek(e: T) -> T? {
        if self.isEmpty() {return nil}
        return array[array.endIndex.pred()]
    }
    func isEmpty() -> Bool {
        return array.count == 0
    }
}