"use strict";

function Class(){}
Class.extend = function extend(methods){
        function Type(){
            for(var m in methods)
                this[m] = methods[m];
        }
        Type.prototype = this.prototype;

        var result = methods.init;
        result.prototype = new Type(); // inherit this.prototype
        result.prototype.constructor = result; // to see constructor name in diagnostic
        
        result.extend = extend;
        return result;
    };

var impl = {
    extend: Class.extend,
    typeGuard: function(from, to){
        if (!(from instanceof to))
            throw new Error("typeguard assertion failed");
        return from;
    },
    makeArray: function(/*dimensions, initializer*/){
        var forward = Array.prototype.slice.call(arguments);
        var result = new Array(forward.shift());
        var i;
        if (forward.length == 1){
            var init = forward[0];
            if (typeof init == "function")
                for(i = 0; i < result.length; ++i)
                    result[i] = init();
            else
                for(i = 0; i < result.length; ++i)
                    result[i] = init;
        }
        else
            for(i = 0; i < result.length; ++i)
                result[i] = this.makeArray.apply(this, forward);
        return result;
    },
    makeSet: function(/*...*/){
        var result = 0;
        
        function checkBit(b){
            if (b < 0 || b > 31)
                throw new Error("integers between 0 and 31 expected, got " + b);
        }

        function setBit(b){
            checkBit(b);
            result |= 1 << b;
        }
        
        for(var i = 0; i < arguments.length; ++i){
            var b = arguments[i];
            if (b instanceof Array){
                var from = b[0];
                var to = b[1];
                if (from < to)
                    throw new Error("invalid SET diapason: " + from + ".." + to);
                for(var bi = from; bi <= to; ++bi)
                    setBit(bi);
            }
            else
                setBit(b);
        }
        return result;
    },
    makeRef: function(obj, prop){
        return {set: function(v){ obj[prop] = v; },
                get: function(){ return obj[prop]; }};
    },
    setInclL: function(l, r){return (l & r) == l;},
    setInclR: function(l, r){return (l & r) == r;},
    assignArrayFromString: function(a, s){
        var i;
        for(i = 0; i < s.length; ++i)
            a[i] = s.charCodeAt(i);
        for(i = s.length; i < a.length; ++i)
            a[i] = 0;
    },
    strToArray: function(s){
        var result = new Array(s.length);
        for(var i = 0; i < s.length; ++i)
            result[i] = s.charCodeAt(i);
        return result;
    },
    strCmp: function(s1, s2){
        var cmp = 0;
        var i = 0;
        while (!cmp && i < s1.length && i < s2.length){
            cmp = s1[i] - s2[i];
            ++i;
        }
        return cmp ? cmp : s1.length - s2.length;
    },
    copy: function(from, to){
        for(var prop in to){
            if (to.hasOwnProperty(prop)){
                var v = from[prop];
                if (v !== null && typeof v == "object")
                    this.copy(v, to[prop]);
                else
                    to[prop] = v;
            }
        }
    },
    assert: function(condition, code){
        if (!condition)
            throw new Error("assertion failed"
                          + ((code !== undefined) ? " with code " + code : ""));
    }
};

exports.Class = Class;
for(var e in impl)
    exports[e] = impl[e];