andrew-aladev/ pdd.by data extractor

## pdd.by data extractor

      
    Raw
  

               pdd.by data extractor
            
          
## collect.js
var async   = require("async");
var cheerio = require("cheerio");
var http    = require("http");
var fs      = require("fs");
var mkdirp  = require("mkdirp");
var path    = require("path");

var questions = JSON.parse(fs.readFileSync("./pdd_by_questions.json", "utf8"));
questions     = questions.map(function (question) {
    var $ = cheerio.load(question.h, {decodeEntities : false});
    $("*").each(function (index, element) {
        var href = $(element).attr("href");
        if (href != null) {
            $(element).attr({
                "href"   : "http://pdd.by" + href,
                "target" : "_blank"
            });
        }
    });
    var hint = $.root().html();

    $ = cheerio.load(question.d, {decodeEntities : false});
    var description = $.root().text();
    var description_images = $("*").map(function (index, element) {
        var url = $(element).css("background-image");
        if (url != null) {
            var match = /url\s*?\(\s*?['"](.*?)['"]/g.exec(url);
            return "http://pdd.by" + match[1];
        } else {
            return null;
        }
    })
    .get();

    $ = cheerio.load(question.v, {decodeEntities : false});
    var variants = $.root().children().map(function (index, element) {
        return $(element).text();
    })
    .get();

    return {
        text               : question.q,
        answer             : question.a,
        variants           : variants,
        hint               : hint,
        description        : description,
        description_images : description_images
    };
});

var index  = 0;
var series = [];
questions.forEach(function (question) {
    question.description_images = question.description_images.map(function (url) {
        var file_path = "./images/" + index + path.extname(url);
        (function (index, url, file_path) {
            series.push(function (callback) {
                var file = fs.createWriteStream(file_path);
                http.get(url, function(response) {
                    response.pipe(file);
                    callback();
                });
            });
        }) (index, url, file_path);
       	index ++;
        return file_path;
    });
});

mkdirp("./images", function () {
    async.series(series);
});
questions = JSON.stringify(questions, null, 2);

var ejs = require("ejs");
var template = ejs.render(fs.readFileSync("index.html.ejs", "utf8"), {
    questions : questions
});
fs.writeFile("index.html", template);

## export.js
var save_data = function (data, file_name, type) {
    var url = URL.createObjectURL(
        new Blob(
            [JSON.stringify(data, null, 2)],
            {type: type}
        )
    );
    var a = document.createElement("a");
    a.href = url;
    a.download = file_name;
    a.click();
    URL.revokeObjectURL(url);
}
save_data(JSON.parse(localStorage.getItem("pdd_by_questions")), "pdd_by_questions.json", "application/json");

## index.html.ejs
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title>ПДД</title>
        <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-beta1/jquery.min.js"></script>
        <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.0/knockout-min.js"></script>
        <script type="text/javascript">
            (function ($) {
                "use strict";

                Array.prototype.shuffle = function() {
                    for (var index = this.length - 1; index > 0; index --) {
                        var rand_index = Math.floor(Math.random() * (index + 1));
                        var temp = this[rand_index];
                        this[rand_index] = this[index];
                        this[index] = temp;
                    }
                    return this;
                }

                var questions = <%- questions %>.shuffle();
                var questions_length = questions.length;

                var data = {
                    answer   : ko.observable(null),
                    is_wrong : ko.observable(null),
                    index    : ko.observable(0),
                    questions_length : questions_length
                };
                data.question = ko.computed(function () {
                    return questions[data.index()];
                });
                function next_question() {
                    if (data.index() < data.questions_length - 1) {
                        data.index(data.index() + 1);
                    } else {
                        data.index(0);
                    }
                    data.is_wrong(null);
                    data.answer(null);
                }
                $(document).ready(function () {
                    ko.applyBindings(data, $(".data").get(0));
                })
                .bind("keypress", function (event) {
                    var key = event.which;
                    if (key >= 48 && key <= 57 && data.answer() == null) {
                        data.answer(key - 48);
                        data.is_wrong(null);
                        event.preventDefault();
                    }
                })
                .bind("keydown", function (event) {
                    var key = event.which;
                    if (key == 8) {
                        data.answer(null);
                        data.is_wrong(null);
                        event.preventDefault();
                    } else if (key == 13) {
                        var is_wrong = data.is_wrong();
                        if (is_wrong == null) {
                            if (data.answer() == null) {
                                next_question();
                            } else if (data.answer() == data.question().answer) {
                                data.is_wrong(false);
                            } else {
                                data.is_wrong(true);
                            }
                        } else if (!is_wrong) {
                            next_question();
                        }
                        event.preventDefault();
                    }
                });
            }) (jQuery);
        </script>
        <style type="text/css">
            .label h2 {
                font-size : 1.2em;
            }
            .question {
                display : table;
            }
            .question .description,
            .question .answer {
                display : table-cell;
                vertical-align : top;
            }
            .question .description.empty {
                display : none;
            }
            .question .description {
                padding : 0 2em 2em 0;
            }
            .question .description .description_images {
                margin  : 0;
                padding : 0;
                list-style-type : none;
            }
            .question .answer {
                padding-top : 1em;
            }
            .question .answer .variants {
                margin  : 0;
                padding : 0;
                list-style-type : none;
            }
            .question .answer .variants .variant {
                line-height : 1.5em;
            }
            .question .answer .answer_number {
                display : inline-block;
                margin  : 0.5em;
                padding : 0.5em;
                font-weight : normal;
            }
            .question .answer .answer_number.is_right {
                background-color : #a3cb51;
            }
            .question .answer .answer_number.is_wrong {
                background-color : #fe4042;
                color : white;
            }
            .question_hint {
                margin : 0;
            }
            .hint {
                opacity : 0.5;
                margin-top : 2em;
                font-size : 0.7em;
            }
        </style>
    </head>
    <body>
        <div class="data">
            <div class="label">
                <span data-bind="text : (index() + 1) + '/' + questions_length"></span>
                <h2 data-bind="text : question().text"></h2>
            </div>
            <div class="question">
                <div class="description" data-bind="css : { 'empty' : question().description_images.length == 0 && $.trim(question().description) == '' }">
                    <ul class="description_images" data-bind="foreach : question().description_images">
                        <li>
                            <img data-bind="attr : { 'src' : $data }" />
                        </li>
                    </ul>
                    <span data-bind="text : question().description"></span>
                </div>
                <div class="answer">
                    <ul class="variants" data-bind="foreach : question().variants">
                        <li class="variant" data-bind="text : $data"></li>
                    </ul>
                    <h4 class="answer_number" data-bind="css : { 'is_right' : is_wrong() == false, 'is_wrong' : is_wrong() == true }">
                        <span>Ответ: </span>
                        <span data-bind="text : answer"></span>
                    </h4>
                </div>
            </div>
            <p class="question_hint">
                <span>Подсказка: </span>
                <span data-bind="html : question().hint"></span>
            </p>
            <p class="hint">
                Ответить или пропустить вопрос - "Enter", удалить ответ - "Backspace"
            </p>
        </div>
    </body>
</html>

## pdd.by.js
(function () {
    /*
    md5.js
    Yi-Cyuan Chen 2014-2015
    @license MIT
    */
    (function(n) {
    function l(a) {
        a ? (k[0] = k[16] = k[1] = k[2] = k[3] = k[4] = k[5] = k[6] = k[7] = k[8] = k[9] = k[10] = k[11] = k[12] = k[13] = k[14] = k[15] = 0, this.blocks = k, this.buffer8 = r) : p ? (a = new ArrayBuffer(68), this.buffer8 = new Uint8Array(a), this.blocks = new Uint32Array(a)) : this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
        this.h0 = this.h1 = this.h2 = this.h3 = this.start = this.bytes = 0;
        this.finalized = this.hashed = !1;
        this.first = !0;
    }
    var t = "object" == typeof process && process.versions && process.versions.node;
    t && (n = global);
    var x = !n.JS_MD5_TEST && "object" == typeof module && module.exports, y = "function" == typeof define && define.amd, p = !n.JS_MD5_TEST && "undefined" != typeof ArrayBuffer, g = "0123456789abcdef".split(""), z = [128, 32768, 8388608, -2147483648], m = [0, 8, 16, 24], u = ["hex", "array", "digest", "buffer"], k = [], r;
    if (p) {
        var v = new ArrayBuffer(68);
        r = new Uint8Array(v);
        k = new Uint32Array(v);
    }
    var w = function(a) {
        return function(d) {
        return (new l(!0)).update(d)[a]();
        };
    }, A = function(a) {
        var d, b;
        try {
        if (n.JS_MD5_TEST) {
            throw "JS_MD5_TEST";
        }
        d = require("crypto");
        b = require("buffer").Buffer;
        } catch (e) {
        return console.log(e), a;
        }
        var c = function(e) {
        if ("string" == typeof e) {
            return e.length <= c.utf8Threshold || e.length <= c.asciiThreshold && !/[^\x00-\x7F]/.test(e) ? a(e) : d.createHash("md5").update(e, "utf8").digest("hex");
        }
        if (e.constructor == ArrayBuffer) {
            e = new Uint8Array(e);
        } else {
            if (void 0 === e.length || e.length <= c.bytesThreshold) {
            return a(e);
            }
        }
        return d.createHash("md5").update(new b(e)).digest("hex");
        };
        c.utf8Threshold = 18;
        c.asciiThreshold = 60;
        c.bytesThreshold = 245;
        return c;
    };
    l.prototype.update = function(a) {
        if (!this.finalized) {
        var d = "string" != typeof a;
        d && a.constructor == n.ArrayBuffer && (a = new Uint8Array(a));
        for (var b, c = 0, e, f = a.length || 0, h = this.blocks, g = this.buffer8;c < f;) {
            this.hashed && (this.hashed = !1, h[0] = h[16], h[16] = h[1] = h[2] = h[3] = h[4] = h[5] = h[6] = h[7] = h[8] = h[9] = h[10] = h[11] = h[12] = h[13] = h[14] = h[15] = 0);
            if (d) {
            if (p) {
                for (e = this.start;c < f && 64 > e;++c) {
                g[e++] = a[c];
                }
            } else {
                for (e = this.start;c < f && 64 > e;++c) {
                h[e >> 2] |= a[c] << m[e++ & 3];
                }
            }
            } else {
            if (p) {
                for (e = this.start;c < f && 64 > e;++c) {
                b = a.charCodeAt(c), 128 > b ? g[e++] = b : (2048 > b ? g[e++] = 192 | b >> 6 : (55296 > b || 57344 <= b ? g[e++] = 224 | b >> 12 : (b = 65536 + ((b & 1023) << 10 | a.charCodeAt(++c) & 1023), g[e++] = 240 | b >> 18, g[e++] = 128 | b >> 12 & 63), g[e++] = 128 | b >> 6 & 63), g[e++] = 128 | b & 63);
                }
            } else {
                for (e = this.start;c < f && 64 > e;++c) {
                b = a.charCodeAt(c), 128 > b ? h[e >> 2] |= b << m[e++ & 3] : (2048 > b ? h[e >> 2] |= (192 | b >> 6) << m[e++ & 3] : (55296 > b || 57344 <= b ? h[e >> 2] |= (224 | b >> 12) << m[e++ & 3] : (b = 65536 + ((b & 1023) << 10 | a.charCodeAt(++c) & 1023), h[e >> 2] |= (240 | b >> 18) << m[e++ & 3], h[e >> 2] |= (128 | b >> 12 & 63) << m[e++ & 3]), h[e >> 2] |= (128 | b >> 6 & 63) << m[e++ & 3]), h[e >> 2] |= (128 | b & 63) << m[e++ & 3]);
                }
            }
            }
            this.lastByteIndex = e;
            this.bytes += e - this.start;
            64 <= e ? (this.start = e - 64, this.hash(), this.hashed = !0) : this.start = e;
        }
        return this;
        }
    };
    l.prototype.finalize = function() {
        if (!this.finalized) {
        this.finalized = !0;
        var a = this.blocks, d = this.lastByteIndex;
        a[d >> 2] |= z[d & 3];
        56 <= d && (this.hashed || this.hash(), a[0] = a[16], a[16] = a[1] = a[2] = a[3] = a[4] = a[5] = a[6] = a[7] = a[8] = a[9] = a[10] = a[11] = a[12] = a[13] = a[14] = a[15] = 0);
        a[14] = this.bytes << 3;
        this.hash();
        }
    };
    l.prototype.hash = function() {
        var a, d, b, c, e, f = this.blocks;
        this.first ? (a = f[0] - 680876937, a = (a << 7 | a >>> 25) - 271733879 << 0, c = (-1732584194 ^ a & 2004318071) + f[1] - 117830708, c = (c << 12 | c >>> 20) + a << 0, b = (-271733879 ^ c & (a ^ -271733879)) + f[2] - 1126478375, b = (b << 17 | b >>> 15) + c << 0, d = (a ^ b & (c ^ a)) + f[3] - 1316259209) : (a = this.h0, d = this.h1, b = this.h2, c = this.h3, a += (c ^ d & (b ^ c)) + f[0] - 680876936, a = (a << 7 | a >>> 25) + d << 0, c += (b ^ a & (d ^ b)) + f[1] - 389564586, c = (c << 12 |
        c >>> 20) + a << 0, b += (d ^ c & (a ^ d)) + f[2] + 606105819, b = (b << 17 | b >>> 15) + c << 0, d += (a ^ b & (c ^ a)) + f[3] - 1044525330);
        d = (d << 22 | d >>> 10) + b << 0;
        a += (c ^ d & (b ^ c)) + f[4] - 176418897;
        a = (a << 7 | a >>> 25) + d << 0;
        c += (b ^ a & (d ^ b)) + f[5] + 1200080426;
        c = (c << 12 | c >>> 20) + a << 0;
        b += (d ^ c & (a ^ d)) + f[6] - 1473231341;
        b = (b << 17 | b >>> 15) + c << 0;
        d += (a ^ b & (c ^ a)) + f[7] - 45705983;
        d = (d << 22 | d >>> 10) + b << 0;
        a += (c ^ d & (b ^ c)) + f[8] + 1770035416;
        a = (a << 7 | a >>> 25) + d << 0;
        c += (b ^ a & (d ^ b)) + f[9] - 1958414417;
        c = (c << 12 | c >>> 20) + a << 0;
        b += (d ^ c & (a ^ d)) + f[10] - 42063;
        b = (b << 17 | b >>> 15) + c << 0;
        d += (a ^ b & (c ^ a)) + f[11] - 1990404162;
        d = (d << 22 | d >>> 10) + b << 0;
        a += (c ^ d & (b ^ c)) + f[12] + 1804603682;
        a = (a << 7 | a >>> 25) + d << 0;
        c += (b ^ a & (d ^ b)) + f[13] - 40341101;
        c = (c << 12 | c >>> 20) + a << 0;
        b += (d ^ c & (a ^ d)) + f[14] - 1502002290;
        b = (b << 17 | b >>> 15) + c << 0;
        d += (a ^ b & (c ^ a)) + f[15] + 1236535329;
        d = (d << 22 | d >>> 10) + b << 0;
        a += (b ^ c & (d ^ b)) + f[1] - 165796510;
        a = (a << 5 | a >>> 27) + d << 0;
        c += (d ^ b & (a ^ d)) + f[6] - 1069501632;
        c = (c << 9 | c >>> 23) + a << 0;
        b += (a ^ d & (c ^ a)) + f[11] + 643717713;
        b = (b << 14 | b >>> 18) + c << 0;
        d += (c ^ a & (b ^ c)) + f[0] - 373897302;
        d = (d << 20 | d >>> 12) + b << 0;
        a += (b ^ c & (d ^ b)) + f[5] - 701558691;
        a = (a << 5 | a >>> 27) + d << 0;
        c += (d ^ b & (a ^ d)) + f[10] + 38016083;
        c = (c << 9 | c >>> 23) + a << 0;
        b += (a ^ d & (c ^ a)) + f[15] - 660478335;
        b = (b << 14 | b >>> 18) + c << 0;
        d += (c ^ a & (b ^ c)) + f[4] - 405537848;
        d = (d << 20 | d >>> 12) + b << 0;
        a += (b ^ c & (d ^ b)) + f[9] + 568446438;
        a = (a << 5 | a >>> 27) + d << 0;
        c += (d ^ b & (a ^ d)) + f[14] - 1019803690;
        c = (c << 9 | c >>> 23) + a << 0;
        b += (a ^ d & (c ^ a)) + f[3] - 187363961;
        b = (b << 14 | b >>> 18) + c << 0;
        d += (c ^ a & (b ^ c)) + f[8] + 1163531501;
        d = (d << 20 | d >>> 12) + b << 0;
        a += (b ^ c & (d ^ b)) + f[13] - 1444681467;
        a = (a << 5 | a >>> 27) + d << 0;
        c += (d ^ b & (a ^ d)) + f[2] - 51403784;
        c = (c << 9 | c >>> 23) + a << 0;
        b += (a ^ d & (c ^ a)) + f[7] + 1735328473;
        b = (b << 14 | b >>> 18) + c << 0;
        d += (c ^ a & (b ^ c)) + f[12] - 1926607734;
        d = (d << 20 | d >>> 12) + b << 0;
        e = d ^ b;
        a += (e ^ c) + f[5] - 378558;
        a = (a << 4 | a >>> 28) + d << 0;
        c += (e ^ a) + f[8] - 2022574463;
        c = (c << 11 | c >>> 21) + a << 0;
        e = c ^ a;
        b += (e ^ d) + f[11] + 1839030562;
        b = (b << 16 | b >>> 16) + c << 0;
        d += (e ^ b) + f[14] - 35309556;
        d = (d << 23 | d >>> 9) + b << 0;
        e = d ^ b;
        a += (e ^ c) + f[1] - 1530992060;
        a = (a << 4 | a >>> 28) + d << 0;
        c += (e ^ a) + f[4] + 1272893353;
        c = (c << 11 | c >>> 21) + a << 0;
        e = c ^ a;
        b += (e ^ d) + f[7] - 155497632;
        b = (b << 16 | b >>> 16) + c << 0;
        d += (e ^ b) + f[10] - 1094730640;
        d = (d << 23 | d >>> 9) + b << 0;
        e = d ^ b;
        a += (e ^ c) + f[13] + 681279174;
        a = (a << 4 | a >>> 28) + d << 0;
        c += (e ^ a) + f[0] - 358537222;
        c = (c << 11 | c >>> 21) + a << 0;
        e = c ^ a;
        b += (e ^ d) + f[3] - 722521979;
        b = (b << 16 | b >>> 16) + c << 0;
        d += (e ^ b) + f[6] + 76029189;
        d = (d << 23 | d >>> 9) + b << 0;
        e = d ^ b;
        a += (e ^ c) + f[9] - 640364487;
        a = (a << 4 | a >>> 28) + d << 0;
        c += (e ^ a) + f[12] - 421815835;
        c = (c << 11 | c >>> 21) + a << 0;
        e = c ^ a;
        b += (e ^ d) + f[15] + 530742520;
        b = (b << 16 | b >>> 16) + c << 0;
        d += (e ^ b) + f[2] - 995338651;
        d = (d << 23 | d >>> 9) + b << 0;
        a += (b ^ (d | ~c)) + f[0] - 198630844;
        a = (a << 6 | a >>> 26) + d << 0;
        c += (d ^ (a | ~b)) + f[7] + 1126891415;
        c = (c << 10 | c >>> 22) + a << 0;
        b += (a ^ (c | ~d)) + f[14] - 1416354905;
        b = (b << 15 | b >>> 17) + c << 0;
        d += (c ^ (b | ~a)) + f[5] - 57434055;
        d = (d << 21 | d >>> 11) + b << 0;
        a += (b ^ (d | ~c)) + f[12] + 1700485571;
        a = (a << 6 | a >>> 26) + d << 0;
        c += (d ^ (a | ~b)) + f[3] - 1894986606;
        c = (c << 10 | c >>> 22) + a << 0;
        b += (a ^ (c | ~d)) + f[10] - 1051523;
        b = (b << 15 | b >>> 17) + c << 0;
        d += (c ^ (b | ~a)) + f[1] - 2054922799;
        d = (d << 21 | d >>> 11) + b << 0;
        a += (b ^ (d | ~c)) + f[8] + 1873313359;
        a = (a << 6 | a >>> 26) + d << 0;
        c += (d ^ (a | ~b)) + f[15] - 30611744;
        c = (c << 10 | c >>> 22) + a << 0;
        b += (a ^ (c | ~d)) + f[6] - 1560198380;
        b = (b << 15 | b >>> 17) + c << 0;
        d += (c ^ (b | ~a)) + f[13] + 1309151649;
        d = (d << 21 | d >>> 11) + b << 0;
        a += (b ^ (d | ~c)) + f[4] - 145523070;
        a = (a << 6 | a >>> 26) + d << 0;
        c += (d ^ (a | ~b)) + f[11] - 1120210379;
        c = (c << 10 | c >>> 22) + a << 0;
        b += (a ^ (c | ~d)) + f[2] + 718787259;
        b = (b << 15 | b >>> 17) + c << 0;
        d += (c ^ (b | ~a)) + f[9] - 343485551;
        d = (d << 21 | d >>> 11) + b << 0;
        this.first ? (this.h0 = a + 1732584193 << 0, this.h1 = d - 271733879 << 0, this.h2 = b - 1732584194 << 0, this.h3 = c + 271733878 << 0, this.first = !1) : (this.h0 = this.h0 + a << 0, this.h1 = this.h1 + d << 0, this.h2 = this.h2 + b << 0, this.h3 = this.h3 + c << 0);
    };
    l.prototype.hex = function() {
        this.finalize();
        var a = this.h0, d = this.h1, b = this.h2, c = this.h3;
        return g[a >> 4 & 15] + g[a & 15] + g[a >> 12 & 15] + g[a >> 8 & 15] + g[a >> 20 & 15] + g[a >> 16 & 15] + g[a >> 28 & 15] + g[a >> 24 & 15] + g[d >> 4 & 15] + g[d & 15] + g[d >> 12 & 15] + g[d >> 8 & 15] + g[d >> 20 & 15] + g[d >> 16 & 15] + g[d >> 28 & 15] + g[d >> 24 & 15] + g[b >> 4 & 15] + g[b & 15] + g[b >> 12 & 15] + g[b >> 8 & 15] + g[b >> 20 & 15] + g[b >> 16 & 15] + g[b >> 28 & 15] + g[b >> 24 & 15] + g[c >> 4 & 15] + g[c & 15] + g[c >> 12 & 15] + g[c >> 8 & 15] + g[c >> 20 & 15] +
        g[c >> 16 & 15] + g[c >> 28 & 15] + g[c >> 24 & 15];
    };
    l.prototype.toString = l.prototype.hex;
    l.prototype.digest = function() {
        this.finalize();
        var a = this.h0, d = this.h1, b = this.h2, c = this.h3;
        return [a & 255, a >> 8 & 255, a >> 16 & 255, a >> 24 & 255, d & 255, d >> 8 & 255, d >> 16 & 255, d >> 24 & 255, b & 255, b >> 8 & 255, b >> 16 & 255, b >> 24 & 255, c & 255, c >> 8 & 255, c >> 16 & 255, c >> 24 & 255];
    };
    l.prototype.array = l.prototype.digest;
    l.prototype.buffer = function() {
        this.finalize();
        var a = new ArrayBuffer(16), d = new Uint32Array(a);
        d[0] = this.h0;
        d[1] = this.h1;
        d[2] = this.h2;
        d[3] = this.h3;
        return a;
    };
    var q = function() {
        var a = w("hex");
        t && (a = A(a));
        a.create = function() {
        return new l;
        };
        a.update = function(b) {
        return a.create().update(b);
        };
        for (var d = 0;d < u.length;++d) {
        var b = u[d];
        a[b] = w(b);
        }
        return a;
    }();
    x ? module.exports = q : (n.md5 = q, y && define(function() {
        return q;
    }));
    })(this);
}) ();

(function ($) {
    "use strict";

    function flow_recursive_series (functions, success, error) {
        var next_function = functions.shift();
        next_function(
            function () {
                if (functions.length == 0) {
                    if (success != null) {
                        success();
                    }
                } else {
                    flow_recursive_series(functions, success, error);
                }
            }, function () {
                if (error != null) {
                    error();
                }
            }
        );
    }

    function flow_series (functions, success, error) {
        if (functions.length == 0) {
            if (success != null) {
                success();
            }
        } else {
            flow_recursive_series(functions, success, error);
        }
    }

    function get_random_number (min, max) {
        return Math.floor(Math.random() * (max - min + 1) + min);
    }

    function logout(timeout, success, error) {
        $.ajax({
            url  : "http://pdd.by/tasks/o/",
            data : {
                meth : "exit"
            },
            timeout : timeout,
            success : function (data) {
                if ($.isFunction(success)) {
                    success();
                }
            },
            error : function () {
                console.error("can't logout");
                if ($.isFunction(error)) {
                    error();
                }
            }
        });
    }

    function parse_questions_list(timeout, type, success, error) {
        $.ajax({
            url  : "http://pdd.by/tasks/o/",
            data : {
                meth   : "start",
                extype : type
            },
            dataType : "json",
            timeout  : timeout,
            success  : function (data) {
                var tickets = data.tickets;
                if (tickets == null) {
                    console.error("no tickets found");
                    if ($.isFunction(error)) {
                        error();
                    }
                    return;
                }

                var series = [];
                for (var index = 0; index < tickets.length; index ++) {
                    (function (index) {
                        series.push(function (success, error) {
                            parse_question (timeout, index, success, error);
                        });
                    }) (index + 1);
                }
                flow_series(
                    series,
                    function () {
                        console.log("test is passed");
                        if ($.isFunction(success)) {
                            success();
                        }
                    },
                    function () {
                        if ($.isFunction(error)) {
                            error();
                        }
                    });
            },
            error : function () {
                console.error("can't get questions list");
                if ($.isFunction(error)) {
                    error();
                }
            }
        });
    }

    function parse_question (timeout, index, success, error) {
        $.ajax({
            url  : "http://pdd.by/tasks/o/",
            data : {
                meth : "select",
                n    : index
            },
            dataType : "json",
            timeout  : timeout,
            success  : function (data) {
                var ticket = data.ticket;
                if (ticket == null) {
                    console.error("no ticket data found");
                    if ($.isFunction(error)) {
                        error();
                    }
                    return;
                }

                ticket = $(ticket);

                var question     = ticket.find(".b-question");
                var raw_question = $.trim(question.html());

                var variants       = ticket.find(".b-variants ul");
                var raw_variants   = $.trim(variants.html());
                var variants_count = variants.find("li").size();
                variants.remove();

                var description     = ticket.find(".b-variants");
                var raw_description = $.trim(description.html());

                if (get_question_index(raw_question, raw_description) != null) {
                    console.log("question is known");
                    if ($.isFunction(success)) {
                        success();
                    }
                    return;
                }

                get_question_answer (timeout, variants_count, function (answer, hint) {
                    store_question(raw_question, raw_description, raw_variants, variants_count, answer, hint);
                    console.log("new question is stored");
                    if ($.isFunction(success)) {
                        success();
                    }
                }, error);
            },
            error : function () {
                console.error("can't get question");
                if ($.isFunction(error)) {
                    error();
                }
            }
        });
    }

    function get_question_index(raw_question, raw_description) {
        var questions_hash = localStorage.getItem("pdd_by_questions_hash");
        if (questions_hash == null) {
            return null;
        }
        questions_hash = JSON.parse(questions_hash);
        return questions_hash[md5(raw_question + raw_description)];
    }

    function store_question(raw_question, raw_description, raw_variants, variants_count, answer, hint) {
        var questions = localStorage.getItem("pdd_by_questions");
        if (questions == null) {
            questions = [];
        } else {
            questions = JSON.parse(questions);
        }
        questions.push({
            q  : raw_question,
            d  : raw_description,
            v  : raw_variants,
            vc : variants_count,
            a  : answer,
            h  : hint
        });
        localStorage.setItem("pdd_by_questions", JSON.stringify(questions));

        var questions_hash = localStorage.getItem("pdd_by_questions_hash");
        if (questions_hash == null) {
            questions_hash = {};
        } else {
            questions_hash = JSON.parse(questions_hash);
        }
        questions_hash[md5(raw_question + raw_description)] = questions.length - 1;
        localStorage.setItem("pdd_by_questions_hash", JSON.stringify(questions_hash));
    }

    function get_question_answer (timeout, variants_count, success, error) {
        $.ajax({
            url  : "http://pdd.by/tasks/o/",
            data : {
                meth : "set",
                n    : get_random_number(1, variants_count)
            },
            dataType : "json",
            timeout  : timeout,
            success  : function (data) {
                var answer = data.answ;
                if (answer == null) {
                    console.error("no answer data found");
                    if ($.isFunction(error)) {
                        error();
                    }
                    return;
                }
                answer = parseInt(answer, 10);
                if (isNaN(answer)) {
                    console.error("answer is invalid");
                    if ($.isFunction(error)) {
                        error();
                    }
                    return;
                }
                if ($.isFunction(success)) {
                    success(answer, data.hint);
                }
            },
            error : function () {
                console.error("can't answer question");
                if ($.isFunction(error)) {
                    error();
                }
            }
        });
    }

    var timeout = 1000;
    function handler() {
        setTimeout(function () {
            process();
        }, 11000);
    }
    function process () {
        logout(timeout, function () {
            parse_questions_list(timeout, 0, handler, handler);
        }, handler);
    }
    process();
}) (jQuery);
	var async = require("async");
	var cheerio = require("cheerio");
	var http = require("http");
	var fs = require("fs");
	var mkdirp = require("mkdirp");
	var path = require("path");

	var questions = JSON.parse(fs.readFileSync("./pdd_by_questions.json", "utf8"));
	questions = questions.map(function (question) {
	var $ = cheerio.load(question.h, {decodeEntities : false});
	$("*").each(function (index, element) {
	var href = $(element).attr("href");
	if (href != null) {
	$(element).attr({
	"href" : "http://pdd.by" + href,
	"target" : "_blank"
	});
	}
	});
	var hint = $.root().html();

	$ = cheerio.load(question.d, {decodeEntities : false});
	var description = $.root().text();
	var description_images = $("*").map(function (index, element) {
	var url = $(element).css("background-image");
	if (url != null) {
	var match = /url\s?\(\s?['"](.*?)['"]/g.exec(url);
	return "http://pdd.by" + match[1];
	} else {
	return null;
	}
	})
	.get();

	$ = cheerio.load(question.v, {decodeEntities : false});
	var variants = $.root().children().map(function (index, element) {
	return $(element).text();
	})
	.get();

	return {
	text : question.q,
	answer : question.a,
	variants : variants,
	hint : hint,
	description : description,
	description_images : description_images
	};
	});

	var index = 0;
	var series = [];
	questions.forEach(function (question) {
	question.description_images = question.description_images.map(function (url) {
	var file_path = "./images/" + index + path.extname(url);
	(function (index, url, file_path) {
	series.push(function (callback) {
	var file = fs.createWriteStream(file_path);
	http.get(url, function(response) {
	response.pipe(file);
	callback();
	});
	});
	}) (index, url, file_path);
	index ++;
	return file_path;
	});
	});

	mkdirp("./images", function () {
	async.series(series);
	});
	questions = JSON.stringify(questions, null, 2);

	var ejs = require("ejs");
	var template = ejs.render(fs.readFileSync("index.html.ejs", "utf8"), {
	questions : questions
	});
	fs.writeFile("index.html", template);
	var save_data = function (data, file_name, type) {
	var url = URL.createObjectURL(
	new Blob(
	[JSON.stringify(data, null, 2)],
	{type: type}
	)
	);
	var a = document.createElement("a");
	a.href = url;
	a.download = file_name;
	a.click();
	URL.revokeObjectURL(url);
	}
	save_data(JSON.parse(localStorage.getItem("pdd_by_questions")), "pdd_by_questions.json", "application/json");
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8" />
	<title>ПДД</title>
	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-beta1/jquery.min.js"></script>
	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.0/knockout-min.js"></script>
	<script type="text/javascript">
	(function ($) {
	"use strict";

	Array.prototype.shuffle = function() {
	for (var index = this.length - 1; index > 0; index --) {
	var rand_index = Math.floor(Math.random() * (index + 1));
	var temp = this[rand_index];
	this[rand_index] = this[index];
	this[index] = temp;
	}
	return this;
	}

	var questions = <%- questions %>.shuffle();
	var questions_length = questions.length;

	var data = {
	answer : ko.observable(null),
	is_wrong : ko.observable(null),
	index : ko.observable(0),
	questions_length : questions_length
	};
	data.question = ko.computed(function () {
	return questions[data.index()];
	});
	function next_question() {
	if (data.index() < data.questions_length - 1) {
	data.index(data.index() + 1);
	} else {
	data.index(0);
	}
	data.is_wrong(null);
	data.answer(null);
	}
	$(document).ready(function () {
	ko.applyBindings(data, $(".data").get(0));
	})
	.bind("keypress", function (event) {
	var key = event.which;
	if (key >= 48 && key <= 57 && data.answer() == null) {
	data.answer(key - 48);
	data.is_wrong(null);
	event.preventDefault();
	}
	})
	.bind("keydown", function (event) {
	var key = event.which;
	if (key == 8) {
	data.answer(null);
	data.is_wrong(null);
	event.preventDefault();
	} else if (key == 13) {
	var is_wrong = data.is_wrong();
	if (is_wrong == null) {
	if (data.answer() == null) {
	next_question();
	} else if (data.answer() == data.question().answer) {
	data.is_wrong(false);
	} else {
	data.is_wrong(true);
	}
	} else if (!is_wrong) {
	next_question();
	}
	event.preventDefault();
	}
	});
	}) (jQuery);
	</script>
	<style type="text/css">
	.label h2 {
	font-size : 1.2em;
	}
	.question {
	display : table;
	}
	.question .description,
	.question .answer {
	display : table-cell;
	vertical-align : top;
	}
	.question .description.empty {
	display : none;
	}
	.question .description {
	padding : 0 2em 2em 0;
	}
	.question .description .description_images {
	margin : 0;
	padding : 0;
	list-style-type : none;
	}
	.question .answer {
	padding-top : 1em;
	}
	.question .answer .variants {
	margin : 0;
	padding : 0;
	list-style-type : none;
	}
	.question .answer .variants .variant {
	line-height : 1.5em;
	}
	.question .answer .answer_number {
	display : inline-block;
	margin : 0.5em;
	padding : 0.5em;
	font-weight : normal;
	}
	.question .answer .answer_number.is_right {
	background-color : #a3cb51;
	}
	.question .answer .answer_number.is_wrong {
	background-color : #fe4042;
	color : white;
	}
	.question_hint {
	margin : 0;
	}
	.hint {
	opacity : 0.5;
	margin-top : 2em;
	font-size : 0.7em;
	}
	</style>
	</head>
	<body>
	<div class="data">
	<div class="label">
	<span data-bind="text : (index() + 1) + '/' + questions_length"></span>
	<h2 data-bind="text : question().text"></h2>
	</div>
	<div class="question">
	<div class="description" data-bind="css : { 'empty' : question().description_images.length == 0 && $.trim(question().description) == '' }">
	<ul class="description_images" data-bind="foreach : question().description_images">
	<li>
	<img data-bind="attr : { 'src' : $data }" />
	</li>
	</ul>
	<span data-bind="text : question().description"></span>
	</div>
	<div class="answer">
	<ul class="variants" data-bind="foreach : question().variants">
	<li class="variant" data-bind="text : $data"></li>
	</ul>
	<h4 class="answer_number" data-bind="css : { 'is_right' : is_wrong() == false, 'is_wrong' : is_wrong() == true }">
	<span>Ответ: </span>
	<span data-bind="text : answer"></span>
	</h4>
	</div>
	</div>
	<p class="question_hint">
	<span>Подсказка: </span>
	<span data-bind="html : question().hint"></span>
	</p>
	<p class="hint">
	Ответить или пропустить вопрос - "Enter", удалить ответ - "Backspace"
	</p>
	</div>
	</body>
	</html>
	(function () {
	/*
	md5.js
	Yi-Cyuan Chen 2014-2015
	@license MIT
	*/
	(function(n) {
	function l(a) {
	a ? (k[0] = k[16] = k[1] = k[2] = k[3] = k[4] = k[5] = k[6] = k[7] = k[8] = k[9] = k[10] = k[11] = k[12] = k[13] = k[14] = k[15] = 0, this.blocks = k, this.buffer8 = r) : p ? (a = new ArrayBuffer(68), this.buffer8 = new Uint8Array(a), this.blocks = new Uint32Array(a)) : this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
	this.h0 = this.h1 = this.h2 = this.h3 = this.start = this.bytes = 0;
	this.finalized = this.hashed = !1;
	this.first = !0;
	}
	var t = "object" == typeof process && process.versions && process.versions.node;
	t && (n = global);
	var x = !n.JS_MD5_TEST && "object" == typeof module && module.exports, y = "function" == typeof define && define.amd, p = !n.JS_MD5_TEST && "undefined" != typeof ArrayBuffer, g = "0123456789abcdef".split(""), z = [128, 32768, 8388608, -2147483648], m = [0, 8, 16, 24], u = ["hex", "array", "digest", "buffer"], k = [], r;
	if (p) {
	var v = new ArrayBuffer(68);
	r = new Uint8Array(v);
	k = new Uint32Array(v);
	}
	var w = function(a) {
	return function(d) {
	return (new l(!0)).update(d)[a]();
	};
	}, A = function(a) {
	var d, b;
	try {
	if (n.JS_MD5_TEST) {
	throw "JS_MD5_TEST";
	}
	d = require("crypto");
	b = require("buffer").Buffer;
	} catch (e) {
	return console.log(e), a;
	}
	var c = function(e) {
	if ("string" == typeof e) {
	return e.length <= c.utf8Threshold \|\| e.length <= c.asciiThreshold && !/[^\x00-\x7F]/.test(e) ? a(e) : d.createHash("md5").update(e, "utf8").digest("hex");
	}
	if (e.constructor == ArrayBuffer) {
	e = new Uint8Array(e);
	} else {
	if (void 0 === e.length \|\| e.length <= c.bytesThreshold) {
	return a(e);
	}
	}
	return d.createHash("md5").update(new b(e)).digest("hex");
	};
	c.utf8Threshold = 18;
	c.asciiThreshold = 60;
	c.bytesThreshold = 245;
	return c;
	};
	l.prototype.update = function(a) {
	if (!this.finalized) {
	var d = "string" != typeof a;
	d && a.constructor == n.ArrayBuffer && (a = new Uint8Array(a));
	for (var b, c = 0, e, f = a.length \|\| 0, h = this.blocks, g = this.buffer8;c < f;) {
	this.hashed && (this.hashed = !1, h[0] = h[16], h[16] = h[1] = h[2] = h[3] = h[4] = h[5] = h[6] = h[7] = h[8] = h[9] = h[10] = h[11] = h[12] = h[13] = h[14] = h[15] = 0);
	if (d) {
	if (p) {
	for (e = this.start;c < f && 64 > e;++c) {
	g[e++] = a[c];
	}
	} else {
	for (e = this.start;c < f && 64 > e;++c) {
	h[e >> 2] \|= a[c] << m[e++ & 3];
	}
	}
	} else {
	if (p) {
	for (e = this.start;c < f && 64 > e;++c) {
	b = a.charCodeAt(c), 128 > b ? g[e++] = b : (2048 > b ? g[e++] = 192 \| b >> 6 : (55296 > b \|\| 57344 <= b ? g[e++] = 224 \| b >> 12 : (b = 65536 + ((b & 1023) << 10 \| a.charCodeAt(++c) & 1023), g[e++] = 240 \| b >> 18, g[e++] = 128 \| b >> 12 & 63), g[e++] = 128 \| b >> 6 & 63), g[e++] = 128 \| b & 63);
	}
	} else {
	for (e = this.start;c < f && 64 > e;++c) {
	b = a.charCodeAt(c), 128 > b ? h[e >> 2] \|= b << m[e++ & 3] : (2048 > b ? h[e >> 2] \|= (192 \| b >> 6) << m[e++ & 3] : (55296 > b \|\| 57344 <= b ? h[e >> 2] \|= (224 \| b >> 12) << m[e++ & 3] : (b = 65536 + ((b & 1023) << 10 \| a.charCodeAt(++c) & 1023), h[e >> 2] \|= (240 \| b >> 18) << m[e++ & 3], h[e >> 2] \|= (128 \| b >> 12 & 63) << m[e++ & 3]), h[e >> 2] \|= (128 \| b >> 6 & 63) << m[e++ & 3]), h[e >> 2] \|= (128 \| b & 63) << m[e++ & 3]);
	}
	}
	}
	this.lastByteIndex = e;
	this.bytes += e - this.start;
	64 <= e ? (this.start = e - 64, this.hash(), this.hashed = !0) : this.start = e;
	}
	return this;
	}
	};
	l.prototype.finalize = function() {
	if (!this.finalized) {
	this.finalized = !0;
	var a = this.blocks, d = this.lastByteIndex;
	a[d >> 2] \|= z[d & 3];
	56 <= d && (this.hashed \|\| this.hash(), a[0] = a[16], a[16] = a[1] = a[2] = a[3] = a[4] = a[5] = a[6] = a[7] = a[8] = a[9] = a[10] = a[11] = a[12] = a[13] = a[14] = a[15] = 0);
	a[14] = this.bytes << 3;
	this.hash();
	}
	};
	l.prototype.hash = function() {
	var a, d, b, c, e, f = this.blocks;
	this.first ? (a = f[0] - 680876937, a = (a << 7 \| a >>> 25) - 271733879 << 0, c = (-1732584194 ^ a & 2004318071) + f[1] - 117830708, c = (c << 12 \| c >>> 20) + a << 0, b = (-271733879 ^ c & (a ^ -271733879)) + f[2] - 1126478375, b = (b << 17 \| b >>> 15) + c << 0, d = (a ^ b & (c ^ a)) + f[3] - 1316259209) : (a = this.h0, d = this.h1, b = this.h2, c = this.h3, a += (c ^ d & (b ^ c)) + f[0] - 680876936, a = (a << 7 \| a >>> 25) + d << 0, c += (b ^ a & (d ^ b)) + f[1] - 389564586, c = (c << 12 \|
	c >>> 20) + a << 0, b += (d ^ c & (a ^ d)) + f[2] + 606105819, b = (b << 17 \| b >>> 15) + c << 0, d += (a ^ b & (c ^ a)) + f[3] - 1044525330);
	d = (d << 22 \| d >>> 10) + b << 0;
	a += (c ^ d & (b ^ c)) + f[4] - 176418897;
	a = (a << 7 \| a >>> 25) + d << 0;
	c += (b ^ a & (d ^ b)) + f[5] + 1200080426;
	c = (c << 12 \| c >>> 20) + a << 0;
	b += (d ^ c & (a ^ d)) + f[6] - 1473231341;
	b = (b << 17 \| b >>> 15) + c << 0;
	d += (a ^ b & (c ^ a)) + f[7] - 45705983;
	d = (d << 22 \| d >>> 10) + b << 0;
	a += (c ^ d & (b ^ c)) + f[8] + 1770035416;
	a = (a << 7 \| a >>> 25) + d << 0;
	c += (b ^ a & (d ^ b)) + f[9] - 1958414417;
	c = (c << 12 \| c >>> 20) + a << 0;
	b += (d ^ c & (a ^ d)) + f[10] - 42063;
	b = (b << 17 \| b >>> 15) + c << 0;
	d += (a ^ b & (c ^ a)) + f[11] - 1990404162;
	d = (d << 22 \| d >>> 10) + b << 0;
	a += (c ^ d & (b ^ c)) + f[12] + 1804603682;
	a = (a << 7 \| a >>> 25) + d << 0;
	c += (b ^ a & (d ^ b)) + f[13] - 40341101;
	c = (c << 12 \| c >>> 20) + a << 0;
	b += (d ^ c & (a ^ d)) + f[14] - 1502002290;
	b = (b << 17 \| b >>> 15) + c << 0;
	d += (a ^ b & (c ^ a)) + f[15] + 1236535329;
	d = (d << 22 \| d >>> 10) + b << 0;
	a += (b ^ c & (d ^ b)) + f[1] - 165796510;
	a = (a << 5 \| a >>> 27) + d << 0;
	c += (d ^ b & (a ^ d)) + f[6] - 1069501632;
	c = (c << 9 \| c >>> 23) + a << 0;
	b += (a ^ d & (c ^ a)) + f[11] + 643717713;
	b = (b << 14 \| b >>> 18) + c << 0;
	d += (c ^ a & (b ^ c)) + f[0] - 373897302;
	d = (d << 20 \| d >>> 12) + b << 0;
	a += (b ^ c & (d ^ b)) + f[5] - 701558691;
	a = (a << 5 \| a >>> 27) + d << 0;
	c += (d ^ b & (a ^ d)) + f[10] + 38016083;
	c = (c << 9 \| c >>> 23) + a << 0;
	b += (a ^ d & (c ^ a)) + f[15] - 660478335;
	b = (b << 14 \| b >>> 18) + c << 0;
	d += (c ^ a & (b ^ c)) + f[4] - 405537848;
	d = (d << 20 \| d >>> 12) + b << 0;
	a += (b ^ c & (d ^ b)) + f[9] + 568446438;
	a = (a << 5 \| a >>> 27) + d << 0;
	c += (d ^ b & (a ^ d)) + f[14] - 1019803690;
	c = (c << 9 \| c >>> 23) + a << 0;
	b += (a ^ d & (c ^ a)) + f[3] - 187363961;
	b = (b << 14 \| b >>> 18) + c << 0;
	d += (c ^ a & (b ^ c)) + f[8] + 1163531501;
	d = (d << 20 \| d >>> 12) + b << 0;
	a += (b ^ c & (d ^ b)) + f[13] - 1444681467;
	a = (a << 5 \| a >>> 27) + d << 0;
	c += (d ^ b & (a ^ d)) + f[2] - 51403784;
	c = (c << 9 \| c >>> 23) + a << 0;
	b += (a ^ d & (c ^ a)) + f[7] + 1735328473;
	b = (b << 14 \| b >>> 18) + c << 0;
	d += (c ^ a & (b ^ c)) + f[12] - 1926607734;
	d = (d << 20 \| d >>> 12) + b << 0;
	e = d ^ b;
	a += (e ^ c) + f[5] - 378558;
	a = (a << 4 \| a >>> 28) + d << 0;
	c += (e ^ a) + f[8] - 2022574463;
	c = (c << 11 \| c >>> 21) + a << 0;
	e = c ^ a;
	b += (e ^ d) + f[11] + 1839030562;
	b = (b << 16 \| b >>> 16) + c << 0;
	d += (e ^ b) + f[14] - 35309556;
	d = (d << 23 \| d >>> 9) + b << 0;
	e = d ^ b;
	a += (e ^ c) + f[1] - 1530992060;
	a = (a << 4 \| a >>> 28) + d << 0;
	c += (e ^ a) + f[4] + 1272893353;
	c = (c << 11 \| c >>> 21) + a << 0;
	e = c ^ a;
	b += (e ^ d) + f[7] - 155497632;
	b = (b << 16 \| b >>> 16) + c << 0;
	d += (e ^ b) + f[10] - 1094730640;
	d = (d << 23 \| d >>> 9) + b << 0;
	e = d ^ b;
	a += (e ^ c) + f[13] + 681279174;
	a = (a << 4 \| a >>> 28) + d << 0;
	c += (e ^ a) + f[0] - 358537222;
	c = (c << 11 \| c >>> 21) + a << 0;
	e = c ^ a;
	b += (e ^ d) + f[3] - 722521979;
	b = (b << 16 \| b >>> 16) + c << 0;
	d += (e ^ b) + f[6] + 76029189;
	d = (d << 23 \| d >>> 9) + b << 0;
	e = d ^ b;
	a += (e ^ c) + f[9] - 640364487;
	a = (a << 4 \| a >>> 28) + d << 0;
	c += (e ^ a) + f[12] - 421815835;
	c = (c << 11 \| c >>> 21) + a << 0;
	e = c ^ a;
	b += (e ^ d) + f[15] + 530742520;
	b = (b << 16 \| b >>> 16) + c << 0;
	d += (e ^ b) + f[2] - 995338651;
	d = (d << 23 \| d >>> 9) + b << 0;
	a += (b ^ (d \| ~c)) + f[0] - 198630844;
	a = (a << 6 \| a >>> 26) + d << 0;
	c += (d ^ (a \| ~b)) + f[7] + 1126891415;
	c = (c << 10 \| c >>> 22) + a << 0;
	b += (a ^ (c \| ~d)) + f[14] - 1416354905;
	b = (b << 15 \| b >>> 17) + c << 0;
	d += (c ^ (b \| ~a)) + f[5] - 57434055;
	d = (d << 21 \| d >>> 11) + b << 0;
	a += (b ^ (d \| ~c)) + f[12] + 1700485571;
	a = (a << 6 \| a >>> 26) + d << 0;
	c += (d ^ (a \| ~b)) + f[3] - 1894986606;
	c = (c << 10 \| c >>> 22) + a << 0;
	b += (a ^ (c \| ~d)) + f[10] - 1051523;
	b = (b << 15 \| b >>> 17) + c << 0;
	d += (c ^ (b \| ~a)) + f[1] - 2054922799;
	d = (d << 21 \| d >>> 11) + b << 0;
	a += (b ^ (d \| ~c)) + f[8] + 1873313359;
	a = (a << 6 \| a >>> 26) + d << 0;
	c += (d ^ (a \| ~b)) + f[15] - 30611744;
	c = (c << 10 \| c >>> 22) + a << 0;
	b += (a ^ (c \| ~d)) + f[6] - 1560198380;
	b = (b << 15 \| b >>> 17) + c << 0;
	d += (c ^ (b \| ~a)) + f[13] + 1309151649;
	d = (d << 21 \| d >>> 11) + b << 0;
	a += (b ^ (d \| ~c)) + f[4] - 145523070;
	a = (a << 6 \| a >>> 26) + d << 0;
	c += (d ^ (a \| ~b)) + f[11] - 1120210379;
	c = (c << 10 \| c >>> 22) + a << 0;
	b += (a ^ (c \| ~d)) + f[2] + 718787259;
	b = (b << 15 \| b >>> 17) + c << 0;
	d += (c ^ (b \| ~a)) + f[9] - 343485551;
	d = (d << 21 \| d >>> 11) + b << 0;
	this.first ? (this.h0 = a + 1732584193 << 0, this.h1 = d - 271733879 << 0, this.h2 = b - 1732584194 << 0, this.h3 = c + 271733878 << 0, this.first = !1) : (this.h0 = this.h0 + a << 0, this.h1 = this.h1 + d << 0, this.h2 = this.h2 + b << 0, this.h3 = this.h3 + c << 0);
	};
	l.prototype.hex = function() {
	this.finalize();
	var a = this.h0, d = this.h1, b = this.h2, c = this.h3;
	return g[a >> 4 & 15] + g[a & 15] + g[a >> 12 & 15] + g[a >> 8 & 15] + g[a >> 20 & 15] + g[a >> 16 & 15] + g[a >> 28 & 15] + g[a >> 24 & 15] + g[d >> 4 & 15] + g[d & 15] + g[d >> 12 & 15] + g[d >> 8 & 15] + g[d >> 20 & 15] + g[d >> 16 & 15] + g[d >> 28 & 15] + g[d >> 24 & 15] + g[b >> 4 & 15] + g[b & 15] + g[b >> 12 & 15] + g[b >> 8 & 15] + g[b >> 20 & 15] + g[b >> 16 & 15] + g[b >> 28 & 15] + g[b >> 24 & 15] + g[c >> 4 & 15] + g[c & 15] + g[c >> 12 & 15] + g[c >> 8 & 15] + g[c >> 20 & 15] +
	g[c >> 16 & 15] + g[c >> 28 & 15] + g[c >> 24 & 15];
	};
	l.prototype.toString = l.prototype.hex;
	l.prototype.digest = function() {
	this.finalize();
	var a = this.h0, d = this.h1, b = this.h2, c = this.h3;
	return [a & 255, a >> 8 & 255, a >> 16 & 255, a >> 24 & 255, d & 255, d >> 8 & 255, d >> 16 & 255, d >> 24 & 255, b & 255, b >> 8 & 255, b >> 16 & 255, b >> 24 & 255, c & 255, c >> 8 & 255, c >> 16 & 255, c >> 24 & 255];
	};
	l.prototype.array = l.prototype.digest;
	l.prototype.buffer = function() {
	this.finalize();
	var a = new ArrayBuffer(16), d = new Uint32Array(a);
	d[0] = this.h0;
	d[1] = this.h1;
	d[2] = this.h2;
	d[3] = this.h3;
	return a;
	};
	var q = function() {
	var a = w("hex");
	t && (a = A(a));
	a.create = function() {
	return new l;
	};
	a.update = function(b) {
	return a.create().update(b);
	};
	for (var d = 0;d < u.length;++d) {
	var b = u[d];
	a[b] = w(b);
	}
	return a;
	}();
	x ? module.exports = q : (n.md5 = q, y && define(function() {
	return q;
	}));
	})(this);
	}) ();

	(function ($) {
	"use strict";

	function flow_recursive_series (functions, success, error) {
	var next_function = functions.shift();
	next_function(
	function () {
	if (functions.length == 0) {
	if (success != null) {
	success();
	}
	} else {
	flow_recursive_series(functions, success, error);
	}
	}, function () {
	if (error != null) {
	error();
	}
	}
	);
	}

	function flow_series (functions, success, error) {
	if (functions.length == 0) {
	if (success != null) {
	success();
	}
	} else {
	flow_recursive_series(functions, success, error);
	}
	}

	function get_random_number (min, max) {
	return Math.floor(Math.random() * (max - min + 1) + min);
	}

	function logout(timeout, success, error) {
	$.ajax({
	url : "http://pdd.by/tasks/o/",
	data : {
	meth : "exit"
	},
	timeout : timeout,
	success : function (data) {
	if ($.isFunction(success)) {
	success();
	}
	},
	error : function () {
	console.error("can't logout");
	if ($.isFunction(error)) {
	error();
	}
	}
	});
	}

	function parse_questions_list(timeout, type, success, error) {
	$.ajax({
	url : "http://pdd.by/tasks/o/",
	data : {
	meth : "start",
	extype : type
	},
	dataType : "json",
	timeout : timeout,
	success : function (data) {
	var tickets = data.tickets;
	if (tickets == null) {
	console.error("no tickets found");
	if ($.isFunction(error)) {
	error();
	}
	return;
	}

	var series = [];
	for (var index = 0; index < tickets.length; index ++) {
	(function (index) {
	series.push(function (success, error) {
	parse_question (timeout, index, success, error);
	});
	}) (index + 1);
	}
	flow_series(
	series,
	function () {
	console.log("test is passed");
	if ($.isFunction(success)) {
	success();
	}
	},
	function () {
	if ($.isFunction(error)) {
	error();
	}
	});
	},
	error : function () {
	console.error("can't get questions list");
	if ($.isFunction(error)) {
	error();
	}
	}
	});
	}

	function parse_question (timeout, index, success, error) {
	$.ajax({
	url : "http://pdd.by/tasks/o/",
	data : {
	meth : "select",
	n : index
	},
	dataType : "json",
	timeout : timeout,
	success : function (data) {
	var ticket = data.ticket;
	if (ticket == null) {
	console.error("no ticket data found");
	if ($.isFunction(error)) {
	error();
	}
	return;
	}

	ticket = $(ticket);

	var question = ticket.find(".b-question");
	var raw_question = $.trim(question.html());

	var variants = ticket.find(".b-variants ul");
	var raw_variants = $.trim(variants.html());
	var variants_count = variants.find("li").size();
	variants.remove();

	var description = ticket.find(".b-variants");
	var raw_description = $.trim(description.html());

	if (get_question_index(raw_question, raw_description) != null) {
	console.log("question is known");
	if ($.isFunction(success)) {
	success();
	}
	return;
	}

	get_question_answer (timeout, variants_count, function (answer, hint) {
	store_question(raw_question, raw_description, raw_variants, variants_count, answer, hint);
	console.log("new question is stored");
	if ($.isFunction(success)) {
	success();
	}
	}, error);
	},
	error : function () {
	console.error("can't get question");
	if ($.isFunction(error)) {
	error();
	}
	}
	});
	}

	function get_question_index(raw_question, raw_description) {
	var questions_hash = localStorage.getItem("pdd_by_questions_hash");
	if (questions_hash == null) {
	return null;
	}
	questions_hash = JSON.parse(questions_hash);
	return questions_hash[md5(raw_question + raw_description)];
	}

	function store_question(raw_question, raw_description, raw_variants, variants_count, answer, hint) {
	var questions = localStorage.getItem("pdd_by_questions");
	if (questions == null) {
	questions = [];
	} else {
	questions = JSON.parse(questions);
	}
	questions.push({
	q : raw_question,
	d : raw_description,
	v : raw_variants,
	vc : variants_count,
	a : answer,
	h : hint
	});
	localStorage.setItem("pdd_by_questions", JSON.stringify(questions));

	var questions_hash = localStorage.getItem("pdd_by_questions_hash");
	if (questions_hash == null) {
	questions_hash = {};
	} else {
	questions_hash = JSON.parse(questions_hash);
	}
	questions_hash[md5(raw_question + raw_description)] = questions.length - 1;
	localStorage.setItem("pdd_by_questions_hash", JSON.stringify(questions_hash));
	}

	function get_question_answer (timeout, variants_count, success, error) {
	$.ajax({
	url : "http://pdd.by/tasks/o/",
	data : {
	meth : "set",
	n : get_random_number(1, variants_count)
	},
	dataType : "json",
	timeout : timeout,
	success : function (data) {
	var answer = data.answ;
	if (answer == null) {
	console.error("no answer data found");
	if ($.isFunction(error)) {
	error();
	}
	return;
	}
	answer = parseInt(answer, 10);
	if (isNaN(answer)) {
	console.error("answer is invalid");
	if ($.isFunction(error)) {
	error();
	}
	return;
	}
	if ($.isFunction(success)) {
	success(answer, data.hint);
	}
	},
	error : function () {
	console.error("can't answer question");
	if ($.isFunction(error)) {
	error();
	}
	}
	});
	}

	var timeout = 1000;
	function handler() {
	setTimeout(function () {
	process();
	}, 11000);
	}
	function process () {
	logout(timeout, function () {
	parse_questions_list(timeout, 0, handler, handler);
	}, handler);
	}
	process();
	}) (jQuery);