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response.go
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response.go
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package epaper
import (
"errors"
"fmt"
"regexp"
"strconv"
)
const (
responseOK = "OK"
)
var (
ErrInvalidCommand = errors.New("invalid command (error 0)")
ErrSDInitiationFailed = errors.New("SD card initiation failed (error 1)")
ErrInvalidArguments = errors.New("invalid arguments (error 2)")
ErrNoSD = errors.New("SD card not inserted (error 3)")
ErrFileNotFound = errors.New("file not found (error 4)")
ErrValidationFailed = errors.New("validation failed (error 20)")
ErrInvalidFrame = errors.New("invalid frame (error 21)")
ErrUndefined = errors.New("undefined error (error 250)")
ErrUnknown = errors.New("unknown error")
)
var (
regexError = regexp.MustCompile(`^Error:(\d+)$`)
commandErrors = map[int]error{
0: ErrInvalidCommand,
1: ErrSDInitiationFailed,
2: ErrInvalidArguments,
3: ErrNoSD,
4: ErrFileNotFound,
20: ErrValidationFailed,
21: ErrInvalidFrame,
250: ErrUndefined,
}
colors = map[byte]Color{
'0': ColorBlack,
'1': ColorDarkGray,
'2': ColorLightGray,
'3': ColorWhite,
}
fontSizes = map[string]FontSize{
"1": FontSize32,
"2": FontSize48,
"3": FontSize64,
}
)
func parseError(resp string) error {
matches := regexError.FindStringSubmatch(resp)
if len(matches) == 2 {
errID, _ := strconv.Atoi(matches[1])
err, hasErr := commandErrors[errID]
if !hasErr {
err = ErrUnknown
}
return err
}
return nil
}
func parseResponse(resp string, err error) (string, error) {
if err != nil {
return "", fmt.Errorf("communication error: %v", err)
}
if err = parseError(resp); err != nil {
return "", err
}
return resp, nil
}
func wantOK(resp string, err error) error {
if err != nil {
return err
}
if resp != responseOK {
return fmt.Errorf("command failed: returned %q, want %q", resp, responseOK)
}
return nil
}
func parseInt(resp string, err error) (int, error) {
if err != nil {
return 0, err
}
i, err := strconv.Atoi(resp)
if err != nil {
return 0, fmt.Errorf("invalid response, expected number, got: %q", resp)
}
return i, nil
}
func parseBool(resp string, err error) (bool, error) {
if err != nil {
return false, err
}
switch resp {
case "0":
return false, nil
case "1":
return true, nil
default:
return false, fmt.Errorf("invalid response, expected 0 or 1, got: %q", resp)
}
}
func parseFontSize(resp string, err error) (FontSize, error) {
if err != nil {
return 0, err
}
size, ok := fontSizes[resp]
if !ok {
return 0, fmt.Errorf("invalid response, got %q", resp)
}
return FontSize(size), nil
}
func parseColors(resp string, err error) (Color, Color, error) {
if err != nil {
return 0, 0, err
}
if len(resp) != 2 {
return 0, 0, fmt.Errorf("invalid response, got %q", resp)
}
f, okf := colors[resp[0]]
b, okb := colors[resp[1]]
if !okf || !okb {
return 0, 0, fmt.Errorf("invalid response, got %q", resp)
}
return f, b, nil
}
func boolToByte(b bool) byte {
if b {
return 1
}
return 0
}