build.js

let cccc = 0;

const getMaxSave = (sourceCode) => {
    let arr = sourceCode.split('');//!!!!!!!!!!
    let saveArr = [];// as { str: string, count: number, save: number }[];

    let f = (n) => {
        let dic = Object.create(null);

        arr.forEach((v, i) => {
            if (i < arr.length - n + 1) {
                v = arr.slice(i, i + n).join('');
                if (dic[v] == null) dic[v] = 0;
                dic[v]++;
            }
        });

        // a | b | c | AAAA

        for (let k in dic) {
            let count = dic[k];
            if (count != 1) {
                saveArr.push({
                    str: k,
                    count,
                    save: n * count - count - n - 1//
                })
            }
        }
    }

    for (let i = 2; i < 32; i++) {//
        f(i);
    }

    saveArr.sort((a, b) => b.save - a.save);
    if (saveArr[0] && saveArr[0].save > 0)
        return saveArr[0];
    else
        return null;
}


const getTable = (sourceCode) => {
    let table = [];//string[]ƒ
    for (let i = 1; i < 128; i++) {
        let s = String.fromCharCode(i);
        if (
            i != 96 &&
            i != 10 &&
            i != 13 &&
            i != 34 &&
            i != 39 &&
            i != 92 && sourceCode.indexOf(s) == -1) // ` \
            table.push(s);
    }
    return table;
}

function ys(sourceCode) {
    let table = getTable(sourceCode);
    let tableStr = '';
    while (table.length > 0) {
        let oneChar = table.pop();
        let obj = getMaxSave(sourceCode);
        if (obj == null) break;
        let s = obj.str;
        console.log(`${++cccc} ${s}      ${oneChar}`);
        tableStr += oneChar;
        sourceCode = sourceCode.split(s).join(oneChar) + oneChar + s;
    }
    tableStr = tableStr.split('').reverse().join('');
    let output = '_="' + sourceCode + '";for(Y in $="' + tableStr + '")with(_.split($[Y]))_=join(pop());eval(_)';
    return output;
}



let fs = require('fs');


let s = fs.readFileSync('src.js', 'utf-8');

//去单行注释
s = s.replace(/\/\/.*/g, '');

//去空格回车
s = s.replace(/new /g, 'yyyyyyyyyyyyyyy');
s = s.replace(/40px /g, 'zzzzzzzzzzzzzz');

s = s.replace(/[ \r\n]+/g, '');
s = s.replace(/yyyyyyyyyyyyyyy/g, 'new ');
s = s.replace(/zzzzzzzzzzzzzz/g, '40px ');


let ok = 'abdefghklmnopqrstuw'.split('');

let r = (a, b) => s = s.split(a).join(b);


r('状态_左_', -1);
r('状态_上_', -2);
r('状态_右_', -3);

r('状态_开始_', 1);
r('状态_正常_', 2);

r('状态_开始下落_', 3);
r('状态_下落中_', 4);

r('状态_结束下落_', 14);

r('状态_爆炸_', 15);
r('状态_爆炸中_', 16);

r('状态_爆炸结束_', 26);
r('状态_游戏结束_', 27);


//关键词
[
    '状态', '结束下落标记', '现在时间', '出现方块x坐标',
    '地图',
    '动画到', '动画开始位置', '动画结束位置', '动画开始时间',
    '是结束', '到xy', '结束',
    '渲染', '填充颜色设置', '百分比', '数组', '标记'
].forEach(v => {
    s = s.split(v).join(ok.pop());
});


s = ys(s);
fs.writeFileSync('index.js', s);
console.log(s.length);