javascript-handwrite/float.html at master · pliao1996/javascript-handwrite · GitHub

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<html>
<meta charset="utf-8">

<head>
  <script>
    var tick = 100, taskQueue = [];
    function runGenerator(gen, rate = 1) {
      var id = setInterval(() => {
        if (!gen.next().value) {
          clearInterval(id)
        }
      }, tick * rate);
      taskQueue.push(id)
    }

    function* decimalToBinary(number, fix) {
      // step1: symbol
      var s = '0'
      if (number < 0) {
        number = 0 - number;
        s = '1'
      }

      // step2: exponent
      var r = 0, num = number;
      if (num > 1) {
        while (num > 1) {
          num /= 2;
          r++
        }
      } else {
        while (num < 1) {
          num *= 2
          r--
        }
      }


      yield function () {
        document.getElementById('formula').innerHTML = `(${s === '0' ? '+' : '-'}) ${num}*2^${r}`;
        document.getElementById('formula').style.border = '1px solid black';
        return true
      }()

      yield function () {
        document.getElementById('symbolSource').innerHTML = s === '0' ? '+' : '-';
        document.getElementById('symbol').style.border = '1px solid black';
        return true
      }()

      yield document.getElementById('symbolbit').innerHTML = s;
      yield document.getElementById('exponentSource').innerHTML = r;

      yield document.getElementById('default').style.visibility = 'visible';
      yield document.getElementById('default').style.color = 'gray';
      yield function () {
        document.getElementById('default').style.color = 'black';
        document.getElementById('default').innerHTML = 1;
        document.getElementById('default').style.border = '1px solid black';
        return true
      }()


      var e = '';
      r += 1023
      e = r.toString(2).padStart(11, '0')

      yield function () {
        document.getElementById('exponentSource').innerHTML += `(${r})`;
        document.getElementById('exponent').style.border = '1px solid black';
        return true
      }()
      // skip converting integer to binary
      yield document.getElementById('exponentbit').innerHTML = e;


      // decimals
      // fix
      num = fix ? parseFloat((num % 1).toPrecision(10)) : num % 1
      yield function () {
        document.getElementById('baseSource').innerHTML = num;
        document.getElementById('base').style.border = '1px solid black';
        return true
      }()

      var total = 52, base = '', completed = false;
      while (num !== 0 && total--) {
        var bitGenerator = function* (total) {
          var cur = num * 2 >= 1 ? 1 : 0
          num = parseFloat((num * 2 % 1).toPrecision(15))  //(num * 2) % 1
          yield document.getElementById('baseSource').innerHTML = `<span style="border:1px solid red;">${cur}</span><span>.</span>${num.toString().split('.')[1]}`
          base += cur
          yield document.getElementById('base' + total).style.color = 'gray';
          yield document.getElementById('base' + total).innerText = cur;
          yield document.getElementById('baseSource').innerHTML = `<span style="border:1px solid red;">0</span><span>.</span>${num.toString().split('.')[1]}`
          if (!total) {
            completed = true
          }
        }
        var id = setTimeout((total) => {
          runGenerator(bitGenerator(total))
        }, tick * 5 * (51 - total), total);
        taskQueue.push(id)
      }


      // after while loop stopped
      // carry bit
      setTimeout(() => {
        let id = setInterval((num) => {
          if (completed) {
            if (total < 0 && num * 2 >= 1) {
              var carrybitGenerator = function* (num) {
                var n = parseFloat((num * 2 % 1).toPrecision(16));
                yield document.getElementById('baseSource').innerHTML = `<span style="border:1px solid red;">1</span><span>.</span>${n.toString().split('.')[1] || 0}`;
                yield document.getElementById('basebit').innerHTML += '+1';
                base = (parseInt(base, 2) + 1).toString(2)
                base = base.padStart(52, '0')
                yield document.getElementById('basebit').innerHTML = base;
              }
              runGenerator(carrybitGenerator(num), 4)
            } else {
              base = base.padEnd(52, '0')
              document.getElementById('basebit').innerHTML = base;
            }
            clearInterval(id)
          }
        }, 200, num);
      }, tick * 5 * 53, num)
      // return s + e + base

    }


    function initialize() {
      document.getElementById('start').disabled = true
      function _initialize(part, num) {
        var container = document.getElementById(part + 'bit');
        for (var i = 0; i < num; i++) {
          var span = document.createElement('span')
          span.id = part + i
          span.innerText = 0
          container.appendChild(span)
        }
      }
      _initialize('symbol', 1)
      _initialize('exponent', 11)
      _initialize('base', 52)
    }

    function reset() {
      while (taskQueue.length > 0) {
        clearInterval(taskQueue.pop())
      }
      document.getElementById('start').disabled = false
      document.getElementById('formula').innerHTML = null;
      document.getElementById('symbol').innerHTML = null;
      document.getElementById('exponent').innerHTML = null;
      document.getElementById('base').innerHTML = null;
      document.getElementById('default').innerHTML = null;

    }

    // onclick event
    function start() {
      initialize()
      runGenerator(decimalToBinary(Number(document.getElementById('decimal').value), true))
    }

    // onclick event
    function add() {
      var str1 = document.getElementById('binaryStr1').value;
      var str2 = document.getElementById('binaryStr2').value;
      // this function add integer binary only
      // TODO add 64bits float binary
      addBinaryStr(str1, str2)
    }

    // onclick event
    function recover() {
      var binary = document.getElementById('binary').value;
      document.getElementById('number').innerText = binaryToDecimal(binary);
    }

    function addBinaryStr(str1, str2) {
      let s = Math.max(str1.length, str2.length)
      str1 = str1.padStart(s, '0')
      str2 = str2.padStart(s, '0')
      let ctx = { str: '', f: 0 }, len = s;
      while (s--) {
        var id = setTimeout((ctx, str1, str2, s) => {
          var cur = ctx.f + Number(str1[s]) + Number(str2[s])
          ctx.str = cur % 2 + ctx.str
          ctx.f = cur > 1 ? 1 : 0
          document.getElementById('sum').innerHTML = `<span style="color:gray;">${ctx.f}</span>${ctx.str}`;
          if (ctx.f && s === 0) {
            setTimeout((ctx) => {
              document.getElementById('sum').innerHTML = ctx.f + ctx.str
            }, tick, ctx)
          }
        }, tick * 2 * (len - 1 - s), ctx, str1, str2, s);
        taskQueue.push(id)
      }
    }

    function binaryToDecimal(str) {
      let sStr = str[0];
      let eStr = str.substring(1, 12)
      let baseStr = str.substring(12, 64)
      let base = function base(str) {
        let num = 0;
        for (let s = 0; s < str.length; s++) {
          num += str[s] * Math.pow(2, -1 - s)
        }
        return 1 + num;
      }(baseStr)

      let e = function exp(str) {
        return parseInt(eStr, 2) - 1023
      }(eStr)
      return (eStr === 1 ? -1 : 1) * Math.pow(base, e)
    }

  </script>
</head>

<body>
  <div class="convertTo" style="padding: 2px 10px;border: 1px dashed black;">
    <p>十进制转二进制</p>
    <div class="source">
      <input type="number" id='decimal' value="0.1" />
      <button id='start' onclick="start();">convert to binary</button>
      <button onclick="reset();">reset</button>
      <span class="float"></span>
    </div>
    <div class='formula' id="formula">
    </div>
    <div class="result">
      <div class="symbol" id="symbol">
        <p id="symbolSource"></p>
        <p id="symbolbit"></p>
      </div>
      <div class="exponent" id="exponent">
        <p id="exponentSource"></p>
        <p id="exponentbit"></p>
      </div>
      <div class='default' id='default' style="border:1px solid black;visibility: hidden;">0</div>
      <div class="base" id="base">
        <p id="baseSource"></p>
        <p id="basebit"></p>
      </div>
    </div>
  </div>
  <br />
  <div class="operator" style="padding: 2px 10px;border: 1px dashed black;">
    <p>二进制相加</p>
    <p><input type="text" style="width: 1000px;" id='binaryStr1' /></p>
    <p><input type="text" style="width: 1000px;" id='binaryStr2' /></p>
    <p id='sum'></p>
    <button id='add' onclick="add();">start +</button>
  </div>

  <br />
  <div class="convertFrom" style="padding: 2px 10px;border: 1px dashed black;">
    <p>二进制转十进制</p>
    <input type="text" id='binary' style="width: 1200px;" />
    <button id='recover' onclick="recover();">convert from binary</button>
    <p id='number'>
    <p>
  </div>
  <script>


  </script>
  <style>
    body,
    input,
    button {
      font-size: x-large;

    }

    body div {
      width: 1200px;
    }

    p {
      margin: auto;
      padding: 0;
    }

    .formula {
      width: 300px;
      height: 60px;
      margin: 10px 0;
      line-height: 60px;
    }

    .result {
      display: flex;
      flex-direction: row;
    }

    .result div {
      height: 60px;
      margin-right: 10px;
    }

    .default {
      line-height: 60px;
    }

    .symbol .default {
      width: 80px;
    }

    .exponent {
      width: 200px;
    }

    .base {
      width: 800px;
    }
    }
  </style>
</body>

</html>