Function builtinBase64

builtins.go:985–1046

(i *interpreter, input value)

}

func builtinBase64(i *interpreter, input value) (value, error) {
	var byteArr []byte

	var sanityCheck = func(v int) (string, bool) {
		if v < 0 || 255 < v {
			msg := fmt.Sprintf("base64 encountered invalid codepoint value in the array (must be 0 <= X <= 255), got %d", v)
			return msg, false
		}

		return "", true
	}

	switch input.(type) {
	case valueString:
		vStr, err := i.getString(input)
		if err != nil {
			return nil, err
		}

		str := vStr.getGoString()
		for _, r := range str {
			n := int(r)
			msg, ok := sanityCheck(n)
			if !ok {
				return nil, makeRuntimeError(msg, i.getCurrentStackTrace())
			}
		}

		byteArr = []byte(str)
	case *valueArray:
		vArr, err := i.getArray(input)
		if err != nil {
			return nil, err
		}

		for _, cThunk := range vArr.elements {
			cTv, err := cThunk.getValue(i)
			if err != nil {
				return nil, err
			}

			vInt, err := i.getInt(cTv)
			if err != nil {
				msg := fmt.Sprintf("base64 encountered a non-integer value in the array, got %s", cTv.getType().name)
				return nil, makeRuntimeError(msg, i.getCurrentStackTrace())
			}

			msg, ok := sanityCheck(vInt)
			if !ok {
				return nil, makeRuntimeError(msg, i.getCurrentStackTrace())
			}

			byteArr = append(byteArr, byte(vInt))
		}
	default:
		msg := fmt.Sprintf("base64 can only base64 encode strings / arrays of single bytes, got %s", input.getType().name)
		return nil, makeRuntimeError(msg, i.getCurrentStackTrace())
	}