json/test.js at master · Drossel-Studio/json · GitHub

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var obj1 = document.getElementById("selfile");
var bms;

var json_obj = {
  header: {
    genre: null,
    title: null,
    artist: null,
    bpm: null,
    playlevel: 0,
    rank: 0,
    wav: [],
  },
  main: [],
  start: 0,
  bpm: []
};

//ダイアログでファイルが選択された時
if (obj1 != null) {
  obj1.addEventListener("change", function(evt) {

    var file = evt.target.files;

    //FileReaderの作成
    var reader = new FileReader();
    //テキスト形式で読み込む
    reader.readAsText(file[0]);
    //読込終了後の処理
    reader.onload = function() {
      bms = reader.result;

      //ヘッダの読み込み
      var key;
      for (key in json_obj.header) {
        json_obj.header[key] = readheader(key);
      }
      json_obj.main = readmain();
      readother();

      var blob = new Blob(
        [JSON.stringify(json_obj)]
      );

      var link = document.createElement("a");
      link.download = file.name + ".json";
      link.href = window.URL.createObjectURL(blob);

      var disp = document.getElementById("disp");

      disp.innerHTML = "<a href='" + link.href + "' target='_blank'>ファイルダウンロード</a>";
    };
  }, false);
}

function readheader(name) {
  var head = bms.indexOf("#" + name, 0);
  if (head == -1)
    return null;
  if (name == "WAV") {
    var wav = [];
    while (head != -1) {
      wav.push(bms.substring(head + name.length + 4, bms.indexOf("\n", head) - 1));
      head = bms.indexOf("#" + name, head + 1);
    }
    return wav;
  }
  return bms.substring(head + name.length + 2, bms.indexOf("\n", head) - 1);
}

function Main(_line, _channel, _data) {
  this.line = _line;
  this.channel = _channel;
  this.data = _data;
}

function readmain() {
  var head = bms.indexOf("MAIN DATA FIELD");
  var measure = 0;
  var i;
  var main_data = [];
  var lane;
  while (head != -1) {
    for (i = 11; i < 14; i++) {
      head = (bms.indexOf("#", head + 1));
      if (head == -1)
        break;
      lane = Number(bms.substr(head + 4, 2));
      if (lane < 11 || lane > 13) {
        continue;
      }
      if (Number(bms.substr(head + 1, 3)) != measure || lane != i) {
        head--;
        continue;
      }
      var data = slice_two(bms.substring(bms.indexOf(":", head) + 1, bms.indexOf("\n", head) - 1));
      var main_obj = new Main(measure, lane - 11, data);
      main_data.push(main_obj);
    }
    measure++;
  }
  return main_data;
}

function readother() {
  var head = bms.indexOf("MAIN DATA FIELD");
  while (head != -1) {
    head = bms.indexOf("#", head + 1);
    if (Number(bms.substr(head + 4, 2)) == 1) {
      json_obj.start = Number(bms.substr(head + 1, 3));
    }
    if (Number(bms.substr(head + 4, 2)) == 3) {
      json_obj.bpm.push([Number(bms.substr(head + 1, 3)), parseInt(bms.substr(bms.indexOf(":", head) + 1, 2), 16)]);
      if (parseInt(bms.substr(bms.indexOf(":", head) + 1, 2), 16) == 0) {
        alert("bpm変更エラー：bpmが正しく設定されていないか、小節の頭に指定されていない可能性があります");
      }
    }

  }
}

function slice_two(data) {
  var length = data.length;
  var i;
  var num = [];
  for (i = 0; i < length; i += 2) {
    num.push(Number(data.slice(i, i + 2)));
  }
  return num;
}