static getAttrValueAsString()

in src/engine/loaders/LoaderDicom.js [898:1029]

• 122 lines of code
• 37 McCabe index (conditional complexity)

  static getAttrValueAsString(tag) {
    if (tag.m_value === null) {
      if (tag.m_vr === 'SQ') {
        // sequence of items
        return '(Sequence Data)';
      }
      return null;
    }
    const SIZE_SHORT = 2;
    const SIZE_DWORD = 4;
    const dvTag = new DataView(tag.m_value);
    let tmp = null;
    let res = null;
    let date = null;
    let readBytes = 0;
    // to do: add AT, OB?, OD?, OF?, OW?, Unknown?
    switch (tag.m_vr) {
      case 'AE': // application entity
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'AS': // age string
        tmp = LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
        // eslint-disable-next-line
        res = Number(tmp.slice(0, 3)).toString();
        switch (tmp[3]) {
          case 'D':
            return `${res} days`;
          case 'W':
            return `${res} weeks`;
          case 'M':
            return `${res} months`;
          case 'Y':
            return `${res} years`;
          default:
            return null;
        }
      case 'CS': // code string
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'DA': // date
        tmp = LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
        // eslint-disable-next-line
        date = new Date(`${tmp.slice(0, 4)}-${tmp.slice(4, 6)}-${tmp.slice(6, 8)}`);
        return date.toLocaleDateString();
      case 'DS': // decimal string
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'DT': // date time
        // to do: parse date-time as YYYYMMDDHHMMSS.FFFFFF&ZZXX
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'FL': // floating point single
        res = dvTag.getFloat32(0, tag.m_littleEndian).toString();
        readBytes = SIZE_DWORD;
        while (readBytes + SIZE_DWORD <= dvTag.byteLength) {
          res = `${res} \\ ${dvTag.getFloat32(readBytes, tag.m_littleEndian).toString()}`;
          readBytes += SIZE_DWORD;
        }
        return res;
      case 'FD': // floating point double
        res = dvTag.getFloat64(0, tag.m_littleEndian).toString();
        readBytes = SIZE_DWORD + SIZE_DWORD;
        while (readBytes + SIZE_DWORD + SIZE_DWORD <= dvTag.byteLength) {
          res = `${res} \\ ${dvTag.getFloat64(readBytes, tag.m_littleEndian).toString()}`;
          readBytes += SIZE_DWORD + SIZE_DWORD;
        }
        return res;
      case 'IS': // integer string
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'LO': // long string
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'LT': // long text
        // to do: check if it works for several paragraphs
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'PN': // person name
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'SH': // short string
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'SL': // signed long
        res = dvTag.getInt32(0, tag.m_littleEndian).toString();
        readBytes = SIZE_DWORD;
        while (readBytes + SIZE_SHORT <= dvTag.byteLength) {
          res = `${res} \\ ${dvTag.getInt16(readBytes, tag.m_littleEndian).toString()}`;
          readBytes += SIZE_DWORD;
        }
        return res;
      case 'SS': // signed short
        res = dvTag.getInt16(0, tag.m_littleEndian).toString();
        readBytes = SIZE_SHORT;
        while (readBytes + SIZE_SHORT <= dvTag.byteLength) {
          res = `${res} \\ ${dvTag.getInt16(readBytes, tag.m_littleEndian).toString()}`;
          readBytes += SIZE_SHORT;
        }
        return res;
      case 'ST': // short text
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'TM': // time
        tmp = LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
        if (tag.m_value.byteLength >= SIZE_SHORT) {
          // eslint-disable-next-line
          res = `${Number(tmp.slice(0, 2))}h`;
        }
        if (tag.m_value.byteLength >= SIZE_DWORD) {
          // eslint-disable-next-line
          res = `${res} ${Number(tmp.slice(2, 4))}m`;
        }
        if (tag.m_value.byteLength > SIZE_DWORD) {
          // eslint-disable-next-line
          res = `${res} ${parseFloat(tmp.slice(4, tag.m_value.byteLength))}s`;
        }
        return res;
      case 'UI': // unique identifier
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      case 'UL': // unsigned long
        res = dvTag.getUint32(0, tag.m_littleEndian).toString();
        readBytes = SIZE_DWORD;
        while (readBytes + SIZE_DWORD <= dvTag.byteLength) {
          res = `${res} \\ ${dvTag.getUint32(readBytes, tag.m_littleEndian).toString()}`;
          readBytes += SIZE_DWORD;
        }
        return res;
      case 'US': // unsigned short
        res = dvTag.getUint16(0, tag.m_littleEndian).toString();
        readBytes = SIZE_SHORT;
        while (readBytes + SIZE_SHORT <= dvTag.byteLength) {
          res = `${res} \\ ${dvTag.getUint16(readBytes, tag.m_littleEndian).toString()}`;
          readBytes += SIZE_SHORT;
        }
        return res;
      case 'UT': // unlimited text
        // to do: check if it works for several paragraphs
        return LoaderDicom.getStringAt(dvTag, 0, tag.m_value.byteLength);
      default:
        return null;
    }
  }