mutating func readSingleAbbreviatedRecordOperand()

in Sources/TSCUtility/BitstreamReader.swift [122:149]

• 28 lines of code
• 11 McCabe index (conditional complexity)

  mutating func readSingleAbbreviatedRecordOperand(_ operand: Bitstream.Abbreviation.Operand) throws -> UInt64 {
    switch operand {
    case .char6:
      let value = try cursor.read(6)
      switch value {
      case 0...25:
        return value + UInt64(("a" as UnicodeScalar).value)
      case 26...51:
        return value + UInt64(("A" as UnicodeScalar).value) - 26
      case 52...61:
        return value + UInt64(("0" as UnicodeScalar).value) - 52
      case 62:
        return UInt64(("." as UnicodeScalar).value)
      case 63:
        return UInt64(("_" as UnicodeScalar).value)
      default:
        fatalError()
      }
    case .literal(let value):
      return value
    case .fixed(let width):
      return try cursor.read(Int(width))
    case .vbr(let width):
      return try cursor.readVBR(Int(width))
    case .array, .blob:
      fatalError()
    }
  }