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/
input_key_mapper.go
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/
input_key_mapper.go
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package main
import (
"bytes"
"fmt"
"regexp"
"unicode"
log "github.com/Sirupsen/logrus"
gc "github.com/rgburke/goncurses"
)
const (
ikmEscapeKey = 0x1B
ikmCtrlMask = 0x1F
)
var keyMap = map[gc.Key]string{
gc.KEY_TAB: "<Tab>",
gc.KEY_RETURN: "<Enter>",
gc.KEY_DOWN: "<Down>",
gc.KEY_UP: "<Up>",
gc.KEY_LEFT: "<Left>",
gc.KEY_RIGHT: "<Right>",
gc.KEY_HOME: "<Home>",
gc.KEY_BACKSPACE: "<Backspace>",
gc.KEY_F1: "<F1>",
gc.KEY_F2: "<F2>",
gc.KEY_F3: "<F3>",
gc.KEY_F4: "<F4>",
gc.KEY_F5: "<F5>",
gc.KEY_F6: "<F6>",
gc.KEY_F7: "<F7>",
gc.KEY_F8: "<F8>",
gc.KEY_F9: "<F9>",
gc.KEY_F10: "<F10>",
gc.KEY_F11: "<F11>",
gc.KEY_F12: "<F12>",
gc.KEY_DL: "<Dl>",
gc.KEY_IL: "<Il>",
gc.KEY_DC: "<Dc>",
gc.KEY_IC: "<Ic>",
gc.KEY_EIC: "<Eic>",
gc.KEY_CLEAR: "<Clear>",
gc.KEY_EOS: "<Eos>",
gc.KEY_EOL: "<Eol>",
gc.KEY_SF: "<Sf>",
gc.KEY_SR: "<Sr>",
gc.KEY_PAGEDOWN: "<PageDown>",
gc.KEY_PAGEUP: "<PageUp>",
gc.KEY_STAB: "<Stab>",
gc.KEY_CTAB: "<Ctab>",
gc.KEY_CATAB: "<Catab>",
gc.KEY_ENTER: "<Enter>",
gc.KEY_PRINT: "<Print>",
gc.KEY_LL: "<Ll>",
gc.KEY_A1: "<A1>",
gc.KEY_A3: "<A3>",
gc.KEY_B2: "<B2>",
gc.KEY_C1: "<C1>",
gc.KEY_C3: "<C3>",
gc.KEY_BTAB: "<S-Tab>",
gc.KEY_BEG: "<Beg>",
gc.KEY_CANCEL: "<Cancel>",
gc.KEY_CLOSE: "<Close>",
gc.KEY_COMMAND: "<Command>",
gc.KEY_COPY: "<Copy>",
gc.KEY_CREATE: "<Create>",
gc.KEY_END: "<End>",
gc.KEY_EXIT: "<Exit>",
gc.KEY_FIND: "<Find>",
gc.KEY_HELP: "<Help>",
gc.KEY_MARK: "<Mark>",
gc.KEY_MESSAGE: "<Message>",
gc.KEY_MOVE: "<Move>",
gc.KEY_NEXT: "<Next>",
gc.KEY_OPEN: "<Open>",
gc.KEY_OPTIONS: "<Options>",
gc.KEY_PREVIOUS: "<Previous>",
gc.KEY_REDO: "<Redo>",
gc.KEY_REFERENCE: "<Reference>",
gc.KEY_REFRESH: "<Refresh>",
gc.KEY_REPLACE: "<Replace>",
gc.KEY_RESTART: "<Restart>",
gc.KEY_RESUME: "<Resume>",
gc.KEY_SAVE: "<Save>",
gc.KEY_SBEG: "<S-Beg>",
gc.KEY_SCANCEL: "<S-Cancel>",
gc.KEY_SCOMMAND: "<S-Command>",
gc.KEY_SCOPY: "<S-Copy>",
gc.KEY_SCREATE: "<S-Create>",
gc.KEY_SDC: "<S-Dc>",
gc.KEY_SDL: "<S-Dl>",
gc.KEY_SELECT: "<Select>",
gc.KEY_SEND: "<S-End>",
gc.KEY_SEOL: "<S-Eol>",
gc.KEY_SEXIT: "<S-Exit>",
gc.KEY_SFIND: "<S-Find>",
gc.KEY_SHELP: "<S-Help>",
gc.KEY_SHOME: "<S-Home>",
gc.KEY_SIC: "<S-Ic>",
gc.KEY_SLEFT: "<S-Left>",
gc.KEY_SMESSAGE: "<S-Message>",
gc.KEY_SMOVE: "<S-Move>",
gc.KEY_SNEXT: "<S-Next>",
gc.KEY_SOPTIONS: "<S-Options>",
gc.KEY_SPREVIOUS: "<S-Previous>",
gc.KEY_SPRINT: "<S-Print>",
gc.KEY_SREDO: "<S-Redo>",
gc.KEY_SREPLACE: "<S-Replace>",
gc.KEY_SRIGHT: "<S-Right>",
gc.KEY_SRSUME: "<S-Rsume>",
gc.KEY_SSAVE: "<S-Save>",
gc.KEY_SSUSPEND: "<S-Suspend>",
gc.KEY_SUNDO: "<S-Undo>",
gc.KEY_SUSPEND: "<Suspend>",
gc.KEY_UNDO: "<Undo>",
gc.KEY_MOUSE: "<Mouse>",
gc.KEY_RESIZE: "<Resize>",
gc.KEY_MAX: "<Max>",
}
var ncursesSpecialKeys map[string]bool
func init() {
ncursesSpecialKeys = make(map[string]bool, len(keyMap))
for _, keyStr := range keyMap {
ncursesSpecialKeys[keyStr] = true
}
}
// InputKeyMapper maps ncurses characters to key string representations and groups byte sequences into UTF-8 characters
type InputKeyMapper struct {
ui InputUI
char bytes.Buffer
expectedCharSize int
}
// NewInputKeyMapper creates a new instance
func NewInputKeyMapper(ui InputUI) *InputKeyMapper {
return &InputKeyMapper{
ui: ui,
}
}
// GetKeyInput fetches the next character or key string returned from the UI
func (inputKeyMapper *InputKeyMapper) GetKeyInput() (key string, err error) {
for {
keyPressEvent, err := inputKeyMapper.ui.GetInput(false)
mappedKey, isMappedKey := keyMap[gc.Key(keyPressEvent)]
switch {
case err != nil:
return key, err
case keyPressEvent == UINoKey:
return key, err
case inputKeyMapper.isProcessingUTF8Char():
err = inputKeyMapper.processUTF8ContinuationByte(keyPressEvent)
case isMappedKey:
return mappedKey, err
case keyPressEvent == ikmEscapeKey:
return inputKeyMapper.metaKeyString(), err
case isControlKey(keyPressEvent):
return controlKeyString(keyPressEvent), err
default:
err = inputKeyMapper.processUTF8Char(keyPressEvent)
}
if err != nil {
log.Errorf("Discarding input character: %v", err)
inputKeyMapper.clearChar()
} else if inputKeyMapper.isUTF8CharComplete() {
return inputKeyMapper.getAndClearChar(), err
}
}
}
func (inputKeyMapper *InputKeyMapper) isProcessingUTF8Char() bool {
return inputKeyMapper.expectedCharSize > 0
}
func (inputKeyMapper *InputKeyMapper) isUTF8CharComplete() bool {
return inputKeyMapper.expectedCharSize > 0 && inputKeyMapper.char.Len() == inputKeyMapper.expectedCharSize
}
func (inputKeyMapper *InputKeyMapper) clearChar() {
inputKeyMapper.expectedCharSize = 0
inputKeyMapper.char.Reset()
}
func (inputKeyMapper *InputKeyMapper) getAndClearChar() (char string) {
char = inputKeyMapper.char.String()
inputKeyMapper.clearChar()
return
}
func (inputKeyMapper *InputKeyMapper) processUTF8ContinuationByte(keyPressEvent Key) (err error) {
if keyPressEvent>>6 != 0x02 {
err = fmt.Errorf("Invalid UTF-8 continuation byte: %b", keyPressEvent)
} else {
inputKeyMapper.char.WriteByte(byte(keyPressEvent))
}
return
}
func (inputKeyMapper *InputKeyMapper) processUTF8Char(keyPressEvent Key) (err error) {
switch {
case keyPressEvent < 0x80:
inputKeyMapper.expectedCharSize = 1
inputKeyMapper.char.WriteByte(byte(keyPressEvent))
case keyPressEvent>>5 == 0x06:
inputKeyMapper.expectedCharSize = 2
inputKeyMapper.char.WriteByte(byte(keyPressEvent))
case keyPressEvent>>4 == 0x0E:
inputKeyMapper.expectedCharSize = 3
inputKeyMapper.char.WriteByte(byte(keyPressEvent))
case keyPressEvent>>3 == 0x1E:
inputKeyMapper.expectedCharSize = 4
inputKeyMapper.char.WriteByte(byte(keyPressEvent))
default:
err = fmt.Errorf("Invalid UTF-8 starting byte: %b", keyPressEvent)
}
return
}
func (inputKeyMapper *InputKeyMapper) metaKeyString() string {
keyPressEvent, err := inputKeyMapper.ui.GetInput(true)
if err != nil || keyPressEvent == 0 {
return "<Escape>"
}
return fmt.Sprintf("<M-%c>", keyPressEvent)
}
func isControlKey(keyPressEvent Key) bool {
return keyPressEvent >= (ikmCtrlMask&'@') && keyPressEvent <= (ikmCtrlMask&'_')
}
func controlKeyString(keyPressEvent Key) string {
return fmt.Sprintf("<C-%c>", unicode.ToLower(rune(keyPressEvent|0x40)))
}
// TokeniseKeys breaks a key string sequence down in to the individual keys is consists of
func TokeniseKeys(keysString string) (keys []string) {
runes := []rune(keysString)
for i := 0; i < len(runes); i++ {
if runes[i] == '<' {
if key, isSpecialKey := specialKeyString(string(runes[i:])); isSpecialKey {
keys = append(keys, key)
i += len(key) - 1
continue
}
}
keys = append(keys, string(runes[i]))
}
return
}
func specialKeyString(potentialKeyString string) (key string, isSpecialKey bool) {
endIndex := -1
for charIndex, char := range potentialKeyString {
if char == '>' {
endIndex = charIndex
break
}
}
if endIndex == -1 {
return
}
keyString := potentialKeyString[0 : endIndex+1]
matched, err := regexp.MatchString("^<(C|M)-.>$", keyString)
if err != nil {
log.Errorf("Invalid Regex: %v", err)
return
}
if matched || isValidAction(keyString) || isNCursesSpecialKey(keyString) {
key = keyString
isSpecialKey = true
}
return
}
func isNCursesSpecialKey(key string) bool {
_, ok := ncursesSpecialKeys[key]
return ok
}