forked from Mirrors/bubbletea
637 lines
18 KiB
Go
637 lines
18 KiB
Go
package tea
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import (
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"context"
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"fmt"
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"io"
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"regexp"
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"unicode/utf8"
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)
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// KeyMsg contains information about a keypress. KeyMsgs are always sent to
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// the program's update function. There are a couple general patterns you could
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// use to check for keypresses:
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//
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// // Switch on the string representation of the key (shorter)
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// switch msg := msg.(type) {
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// case KeyMsg:
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// switch msg.String() {
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// case "enter":
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// fmt.Println("you pressed enter!")
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// case "a":
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// fmt.Println("you pressed a!")
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// }
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// }
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//
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// // Switch on the key type (more foolproof)
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// switch msg := msg.(type) {
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// case KeyMsg:
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// switch msg.Type {
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// case KeyEnter:
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// fmt.Println("you pressed enter!")
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// case KeyRunes:
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// switch string(msg.Runes) {
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// case "a":
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// fmt.Println("you pressed a!")
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// }
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// }
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// }
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//
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// Note that Key.Runes will always contain at least one character, so you can
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// always safely call Key.Runes[0]. In most cases Key.Runes will only contain
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// one character, though certain input method editors (most notably Chinese
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// IMEs) can input multiple runes at once.
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type KeyMsg Key
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// String returns a string representation for a key message. It's safe (and
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// encouraged) for use in key comparison.
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func (k KeyMsg) String() (str string) {
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return Key(k).String()
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}
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// Key contains information about a keypress.
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type Key struct {
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Type KeyType
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Runes []rune
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Alt bool
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}
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// String returns a friendly string representation for a key. It's safe (and
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// encouraged) for use in key comparison.
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//
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// k := Key{Type: KeyEnter}
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// fmt.Println(k)
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// // Output: enter
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func (k Key) String() (str string) {
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if k.Alt {
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str += "alt+"
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}
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if k.Type == KeyRunes {
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str += string(k.Runes)
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return str
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} else if s, ok := keyNames[k.Type]; ok {
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str += s
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return str
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}
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return ""
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}
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// KeyType indicates the key pressed, such as KeyEnter or KeyBreak or KeyCtrlC.
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// All other keys will be type KeyRunes. To get the rune value, check the Rune
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// method on a Key struct, or use the Key.String() method:
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//
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// k := Key{Type: KeyRunes, Runes: []rune{'a'}, Alt: true}
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// if k.Type == KeyRunes {
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//
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// fmt.Println(k.Runes)
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// // Output: a
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//
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// fmt.Println(k.String())
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// // Output: alt+a
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//
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// }
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type KeyType int
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func (k KeyType) String() (str string) {
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if s, ok := keyNames[k]; ok {
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return s
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}
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return ""
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}
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// Control keys. We could do this with an iota, but the values are very
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// specific, so we set the values explicitly to avoid any confusion.
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//
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// See also:
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// https://en.wikipedia.org/wiki/C0_and_C1_control_codes
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const (
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keyNUL KeyType = 0 // null, \0
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keySOH KeyType = 1 // start of heading
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keySTX KeyType = 2 // start of text
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keyETX KeyType = 3 // break, ctrl+c
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keyEOT KeyType = 4 // end of transmission
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keyENQ KeyType = 5 // enquiry
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keyACK KeyType = 6 // acknowledge
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keyBEL KeyType = 7 // bell, \a
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keyBS KeyType = 8 // backspace
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keyHT KeyType = 9 // horizontal tabulation, \t
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keyLF KeyType = 10 // line feed, \n
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keyVT KeyType = 11 // vertical tabulation \v
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keyFF KeyType = 12 // form feed \f
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keyCR KeyType = 13 // carriage return, \r
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keySO KeyType = 14 // shift out
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keySI KeyType = 15 // shift in
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keyDLE KeyType = 16 // data link escape
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keyDC1 KeyType = 17 // device control one
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keyDC2 KeyType = 18 // device control two
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keyDC3 KeyType = 19 // device control three
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keyDC4 KeyType = 20 // device control four
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keyNAK KeyType = 21 // negative acknowledge
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keySYN KeyType = 22 // synchronous idle
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keyETB KeyType = 23 // end of transmission block
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keyCAN KeyType = 24 // cancel
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keyEM KeyType = 25 // end of medium
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keySUB KeyType = 26 // substitution
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keyESC KeyType = 27 // escape, \e
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keyFS KeyType = 28 // file separator
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keyGS KeyType = 29 // group separator
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keyRS KeyType = 30 // record separator
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keyUS KeyType = 31 // unit separator
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keyDEL KeyType = 127 // delete. on most systems this is mapped to backspace, I hear
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)
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// Control key aliases.
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const (
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KeyNull KeyType = keyNUL
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KeyBreak KeyType = keyETX
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KeyEnter KeyType = keyCR
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KeyBackspace KeyType = keyDEL
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KeyTab KeyType = keyHT
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KeyEsc KeyType = keyESC
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KeyEscape KeyType = keyESC
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KeyCtrlAt KeyType = keyNUL // ctrl+@
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KeyCtrlA KeyType = keySOH
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KeyCtrlB KeyType = keySTX
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KeyCtrlC KeyType = keyETX
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KeyCtrlD KeyType = keyEOT
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KeyCtrlE KeyType = keyENQ
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KeyCtrlF KeyType = keyACK
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KeyCtrlG KeyType = keyBEL
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KeyCtrlH KeyType = keyBS
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KeyCtrlI KeyType = keyHT
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KeyCtrlJ KeyType = keyLF
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KeyCtrlK KeyType = keyVT
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KeyCtrlL KeyType = keyFF
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KeyCtrlM KeyType = keyCR
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KeyCtrlN KeyType = keySO
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KeyCtrlO KeyType = keySI
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KeyCtrlP KeyType = keyDLE
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KeyCtrlQ KeyType = keyDC1
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KeyCtrlR KeyType = keyDC2
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KeyCtrlS KeyType = keyDC3
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KeyCtrlT KeyType = keyDC4
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KeyCtrlU KeyType = keyNAK
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KeyCtrlV KeyType = keySYN
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KeyCtrlW KeyType = keyETB
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KeyCtrlX KeyType = keyCAN
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KeyCtrlY KeyType = keyEM
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KeyCtrlZ KeyType = keySUB
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KeyCtrlOpenBracket KeyType = keyESC // ctrl+[
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KeyCtrlBackslash KeyType = keyFS // ctrl+\
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KeyCtrlCloseBracket KeyType = keyGS // ctrl+]
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KeyCtrlCaret KeyType = keyRS // ctrl+^
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KeyCtrlUnderscore KeyType = keyUS // ctrl+_
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KeyCtrlQuestionMark KeyType = keyDEL // ctrl+?
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)
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// Other keys.
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const (
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KeyRunes KeyType = -(iota + 1)
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KeyUp
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KeyDown
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KeyRight
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KeyLeft
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KeyShiftTab
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KeyHome
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KeyEnd
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KeyPgUp
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KeyPgDown
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KeyCtrlPgUp
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KeyCtrlPgDown
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KeyDelete
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KeyInsert
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KeySpace
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KeyCtrlUp
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KeyCtrlDown
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KeyCtrlRight
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KeyCtrlLeft
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KeyCtrlHome
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KeyCtrlEnd
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KeyShiftUp
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KeyShiftDown
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KeyShiftRight
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KeyShiftLeft
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KeyShiftHome
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KeyShiftEnd
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KeyCtrlShiftUp
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KeyCtrlShiftDown
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KeyCtrlShiftLeft
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KeyCtrlShiftRight
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KeyCtrlShiftHome
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KeyCtrlShiftEnd
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KeyF1
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KeyF2
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KeyF3
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KeyF4
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KeyF5
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KeyF6
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KeyF7
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KeyF8
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KeyF9
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KeyF10
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KeyF11
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KeyF12
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KeyF13
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KeyF14
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KeyF15
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KeyF16
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KeyF17
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KeyF18
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KeyF19
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KeyF20
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)
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// Mappings for control keys and other special keys to friendly consts.
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var keyNames = map[KeyType]string{
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// Control keys.
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keyNUL: "ctrl+@", // also ctrl+` (that's ctrl+backtick)
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keySOH: "ctrl+a",
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keySTX: "ctrl+b",
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keyETX: "ctrl+c",
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keyEOT: "ctrl+d",
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keyENQ: "ctrl+e",
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keyACK: "ctrl+f",
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keyBEL: "ctrl+g",
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keyBS: "ctrl+h",
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keyHT: "tab", // also ctrl+i
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keyLF: "ctrl+j",
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keyVT: "ctrl+k",
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keyFF: "ctrl+l",
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keyCR: "enter",
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keySO: "ctrl+n",
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keySI: "ctrl+o",
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keyDLE: "ctrl+p",
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keyDC1: "ctrl+q",
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keyDC2: "ctrl+r",
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keyDC3: "ctrl+s",
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keyDC4: "ctrl+t",
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keyNAK: "ctrl+u",
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keySYN: "ctrl+v",
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keyETB: "ctrl+w",
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keyCAN: "ctrl+x",
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keyEM: "ctrl+y",
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keySUB: "ctrl+z",
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keyESC: "esc",
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keyFS: "ctrl+\\",
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keyGS: "ctrl+]",
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keyRS: "ctrl+^",
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keyUS: "ctrl+_",
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keyDEL: "backspace",
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// Other keys.
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KeyRunes: "runes",
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KeyUp: "up",
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KeyDown: "down",
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KeyRight: "right",
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KeySpace: " ", // for backwards compatibility
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KeyLeft: "left",
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KeyShiftTab: "shift+tab",
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KeyHome: "home",
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KeyEnd: "end",
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KeyCtrlHome: "ctrl+home",
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KeyCtrlEnd: "ctrl+end",
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KeyShiftHome: "shift+home",
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KeyShiftEnd: "shift+end",
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KeyCtrlShiftHome: "ctrl+shift+home",
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KeyCtrlShiftEnd: "ctrl+shift+end",
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KeyPgUp: "pgup",
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KeyPgDown: "pgdown",
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KeyCtrlPgUp: "ctrl+pgup",
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KeyCtrlPgDown: "ctrl+pgdown",
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KeyDelete: "delete",
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KeyInsert: "insert",
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KeyCtrlUp: "ctrl+up",
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KeyCtrlDown: "ctrl+down",
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KeyCtrlRight: "ctrl+right",
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KeyCtrlLeft: "ctrl+left",
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KeyShiftUp: "shift+up",
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KeyShiftDown: "shift+down",
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KeyShiftRight: "shift+right",
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KeyShiftLeft: "shift+left",
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KeyCtrlShiftUp: "ctrl+shift+up",
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KeyCtrlShiftDown: "ctrl+shift+down",
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KeyCtrlShiftLeft: "ctrl+shift+left",
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KeyCtrlShiftRight: "ctrl+shift+right",
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KeyF1: "f1",
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KeyF2: "f2",
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KeyF3: "f3",
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KeyF4: "f4",
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KeyF5: "f5",
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KeyF6: "f6",
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KeyF7: "f7",
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KeyF8: "f8",
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KeyF9: "f9",
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KeyF10: "f10",
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KeyF11: "f11",
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KeyF12: "f12",
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KeyF13: "f13",
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KeyF14: "f14",
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KeyF15: "f15",
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KeyF16: "f16",
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KeyF17: "f17",
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KeyF18: "f18",
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KeyF19: "f19",
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KeyF20: "f20",
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}
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// Sequence mappings.
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var sequences = map[string]Key{
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// Arrow keys
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"\x1b[A": {Type: KeyUp},
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"\x1b[B": {Type: KeyDown},
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"\x1b[C": {Type: KeyRight},
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"\x1b[D": {Type: KeyLeft},
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"\x1b[1;2A": {Type: KeyShiftUp},
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"\x1b[1;2B": {Type: KeyShiftDown},
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"\x1b[1;2C": {Type: KeyShiftRight},
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"\x1b[1;2D": {Type: KeyShiftLeft},
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"\x1b[OA": {Type: KeyShiftUp}, // DECCKM
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"\x1b[OB": {Type: KeyShiftDown}, // DECCKM
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"\x1b[OC": {Type: KeyShiftRight}, // DECCKM
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"\x1b[OD": {Type: KeyShiftLeft}, // DECCKM
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"\x1b[a": {Type: KeyShiftUp}, // urxvt
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"\x1b[b": {Type: KeyShiftDown}, // urxvt
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"\x1b[c": {Type: KeyShiftRight}, // urxvt
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"\x1b[d": {Type: KeyShiftLeft}, // urxvt
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"\x1b[1;3A": {Type: KeyUp, Alt: true},
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"\x1b[1;3B": {Type: KeyDown, Alt: true},
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"\x1b[1;3C": {Type: KeyRight, Alt: true},
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"\x1b[1;3D": {Type: KeyLeft, Alt: true},
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"\x1b[1;4A": {Type: KeyShiftUp, Alt: true},
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"\x1b[1;4B": {Type: KeyShiftDown, Alt: true},
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"\x1b[1;4C": {Type: KeyShiftRight, Alt: true},
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"\x1b[1;4D": {Type: KeyShiftLeft, Alt: true},
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"\x1b[1;5A": {Type: KeyCtrlUp},
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"\x1b[1;5B": {Type: KeyCtrlDown},
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"\x1b[1;5C": {Type: KeyCtrlRight},
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"\x1b[1;5D": {Type: KeyCtrlLeft},
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"\x1b[Oa": {Type: KeyCtrlUp, Alt: true}, // urxvt
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"\x1b[Ob": {Type: KeyCtrlDown, Alt: true}, // urxvt
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"\x1b[Oc": {Type: KeyCtrlRight, Alt: true}, // urxvt
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"\x1b[Od": {Type: KeyCtrlLeft, Alt: true}, // urxvt
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"\x1b[1;6A": {Type: KeyCtrlShiftUp},
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"\x1b[1;6B": {Type: KeyCtrlShiftDown},
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"\x1b[1;6C": {Type: KeyCtrlShiftRight},
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"\x1b[1;6D": {Type: KeyCtrlShiftLeft},
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"\x1b[1;7A": {Type: KeyCtrlUp, Alt: true},
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"\x1b[1;7B": {Type: KeyCtrlDown, Alt: true},
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"\x1b[1;7C": {Type: KeyCtrlRight, Alt: true},
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"\x1b[1;7D": {Type: KeyCtrlLeft, Alt: true},
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"\x1b[1;8A": {Type: KeyCtrlShiftUp, Alt: true},
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"\x1b[1;8B": {Type: KeyCtrlShiftDown, Alt: true},
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"\x1b[1;8C": {Type: KeyCtrlShiftRight, Alt: true},
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"\x1b[1;8D": {Type: KeyCtrlShiftLeft, Alt: true},
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// Miscellaneous keys
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"\x1b[Z": {Type: KeyShiftTab},
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"\x1b[2~": {Type: KeyInsert},
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"\x1b[3;2~": {Type: KeyInsert, Alt: true},
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"\x1b[3~": {Type: KeyDelete},
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"\x1b[3;3~": {Type: KeyDelete, Alt: true},
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"\x1b[5~": {Type: KeyPgUp},
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"\x1b[5;3~": {Type: KeyPgUp, Alt: true},
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"\x1b[5;5~": {Type: KeyCtrlPgUp},
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"\x1b[5^": {Type: KeyCtrlPgUp}, // urxvt
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"\x1b[5;7~": {Type: KeyCtrlPgUp, Alt: true},
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"\x1b[6~": {Type: KeyPgDown},
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"\x1b[6;3~": {Type: KeyPgDown, Alt: true},
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"\x1b[6;5~": {Type: KeyCtrlPgDown},
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"\x1b[6^": {Type: KeyCtrlPgDown}, // urxvt
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"\x1b[6;7~": {Type: KeyCtrlPgDown, Alt: true},
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"\x1b[1~": {Type: KeyHome},
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"\x1b[H": {Type: KeyHome}, // xterm, lxterm
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"\x1b[1;3H": {Type: KeyHome, Alt: true}, // xterm, lxterm
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"\x1b[1;5H": {Type: KeyCtrlHome}, // xterm, lxterm
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"\x1b[1;7H": {Type: KeyCtrlHome, Alt: true}, // xterm, lxterm
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"\x1b[1;2H": {Type: KeyShiftHome}, // xterm, lxterm
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"\x1b[1;4H": {Type: KeyShiftHome, Alt: true}, // xterm, lxterm
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"\x1b[1;6H": {Type: KeyCtrlShiftHome}, // xterm, lxterm
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"\x1b[1;8H": {Type: KeyCtrlShiftHome, Alt: true}, // xterm, lxterm
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"\x1b[4~": {Type: KeyEnd},
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"\x1b[F": {Type: KeyEnd}, // xterm, lxterm
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"\x1b[1;3F": {Type: KeyEnd, Alt: true}, // xterm, lxterm
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"\x1b[1;5F": {Type: KeyCtrlEnd}, // xterm, lxterm
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"\x1b[1;7F": {Type: KeyCtrlEnd, Alt: true}, // xterm, lxterm
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"\x1b[1;2F": {Type: KeyShiftEnd}, // xterm, lxterm
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"\x1b[1;4F": {Type: KeyShiftEnd, Alt: true}, // xterm, lxterm
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"\x1b[1;6F": {Type: KeyCtrlShiftEnd}, // xterm, lxterm
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"\x1b[1;8F": {Type: KeyCtrlShiftEnd, Alt: true}, // xterm, lxterm
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"\x1b[7~": {Type: KeyHome}, // urxvt
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"\x1b[7^": {Type: KeyCtrlHome}, // urxvt
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"\x1b[7$": {Type: KeyShiftHome}, // urxvt
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"\x1b[7@": {Type: KeyCtrlShiftHome}, // urxvt
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"\x1b[8~": {Type: KeyEnd}, // urxvt
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"\x1b[8^": {Type: KeyCtrlEnd}, // urxvt
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"\x1b[8$": {Type: KeyShiftEnd}, // urxvt
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"\x1b[8@": {Type: KeyCtrlShiftEnd}, // urxvt
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// Function keys, Linux console
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"\x1b[[A": {Type: KeyF1}, // linux console
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"\x1b[[B": {Type: KeyF2}, // linux console
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"\x1b[[C": {Type: KeyF3}, // linux console
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"\x1b[[D": {Type: KeyF4}, // linux console
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"\x1b[[E": {Type: KeyF5}, // linux console
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// Function keys, X11
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"\x1bOP": {Type: KeyF1}, // vt100, xterm
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"\x1bOQ": {Type: KeyF2}, // vt100, xterm
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"\x1bOR": {Type: KeyF3}, // vt100, xterm
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"\x1bOS": {Type: KeyF4}, // vt100, xterm
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"\x1b[1;3P": {Type: KeyF1, Alt: true}, // vt100, xterm
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"\x1b[1;3Q": {Type: KeyF2, Alt: true}, // vt100, xterm
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"\x1b[1;3R": {Type: KeyF3, Alt: true}, // vt100, xterm
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"\x1b[1;3S": {Type: KeyF4, Alt: true}, // vt100, xterm
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"\x1b[11~": {Type: KeyF1}, // urxvt
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"\x1b[12~": {Type: KeyF2}, // urxvt
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"\x1b[13~": {Type: KeyF3}, // urxvt
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"\x1b[14~": {Type: KeyF4}, // urxvt
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"\x1b[15~": {Type: KeyF5}, // vt100, xterm, also urxvt
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|
|
|
"\x1b[15;3~": {Type: KeyF5, Alt: true}, // vt100, xterm, also urxvt
|
|
|
|
"\x1b[17~": {Type: KeyF6}, // vt100, xterm, also urxvt
|
|
"\x1b[18~": {Type: KeyF7}, // vt100, xterm, also urxvt
|
|
"\x1b[19~": {Type: KeyF8}, // vt100, xterm, also urxvt
|
|
"\x1b[20~": {Type: KeyF9}, // vt100, xterm, also urxvt
|
|
"\x1b[21~": {Type: KeyF10}, // vt100, xterm, also urxvt
|
|
|
|
"\x1b[17;3~": {Type: KeyF6, Alt: true}, // vt100, xterm
|
|
"\x1b[18;3~": {Type: KeyF7, Alt: true}, // vt100, xterm
|
|
"\x1b[19;3~": {Type: KeyF8, Alt: true}, // vt100, xterm
|
|
"\x1b[20;3~": {Type: KeyF9, Alt: true}, // vt100, xterm
|
|
"\x1b[21;3~": {Type: KeyF10, Alt: true}, // vt100, xterm
|
|
|
|
"\x1b[23~": {Type: KeyF11}, // vt100, xterm, also urxvt
|
|
"\x1b[24~": {Type: KeyF12}, // vt100, xterm, also urxvt
|
|
|
|
"\x1b[23;3~": {Type: KeyF11, Alt: true}, // vt100, xterm
|
|
"\x1b[24;3~": {Type: KeyF12, Alt: true}, // vt100, xterm
|
|
|
|
"\x1b[1;2P": {Type: KeyF13},
|
|
"\x1b[1;2Q": {Type: KeyF14},
|
|
|
|
"\x1b[25~": {Type: KeyF13}, // vt100, xterm, also urxvt
|
|
"\x1b[26~": {Type: KeyF14}, // vt100, xterm, also urxvt
|
|
|
|
"\x1b[25;3~": {Type: KeyF13, Alt: true}, // vt100, xterm
|
|
"\x1b[26;3~": {Type: KeyF14, Alt: true}, // vt100, xterm
|
|
|
|
"\x1b[1;2R": {Type: KeyF15},
|
|
"\x1b[1;2S": {Type: KeyF16},
|
|
|
|
"\x1b[28~": {Type: KeyF15}, // vt100, xterm, also urxvt
|
|
"\x1b[29~": {Type: KeyF16}, // vt100, xterm, also urxvt
|
|
|
|
"\x1b[28;3~": {Type: KeyF15, Alt: true}, // vt100, xterm
|
|
"\x1b[29;3~": {Type: KeyF16, Alt: true}, // vt100, xterm
|
|
|
|
"\x1b[15;2~": {Type: KeyF17},
|
|
"\x1b[17;2~": {Type: KeyF18},
|
|
"\x1b[18;2~": {Type: KeyF19},
|
|
"\x1b[19;2~": {Type: KeyF20},
|
|
|
|
"\x1b[31~": {Type: KeyF17},
|
|
"\x1b[32~": {Type: KeyF18},
|
|
"\x1b[33~": {Type: KeyF19},
|
|
"\x1b[34~": {Type: KeyF20},
|
|
|
|
// Powershell sequences.
|
|
"\x1bOA": {Type: KeyUp, Alt: false},
|
|
"\x1bOB": {Type: KeyDown, Alt: false},
|
|
"\x1bOC": {Type: KeyRight, Alt: false},
|
|
"\x1bOD": {Type: KeyLeft, Alt: false},
|
|
}
|
|
|
|
// unknownInputByteMsg is reported by the input reader when an invalid
|
|
// utf-8 byte is detected on the input. Currently, it is not handled
|
|
// further by bubbletea. However, having this event makes it possible
|
|
// to troubleshoot invalid inputs.
|
|
type unknownInputByteMsg byte
|
|
|
|
func (u unknownInputByteMsg) String() string {
|
|
return fmt.Sprintf("?%#02x?", int(u))
|
|
}
|
|
|
|
// unknownCSISequenceMsg is reported by the input reader when an
|
|
// unrecognized CSI sequence is detected on the input. Currently, it
|
|
// is not handled further by bubbletea. However, having this event
|
|
// makes it possible to troubleshoot invalid inputs.
|
|
type unknownCSISequenceMsg []byte
|
|
|
|
func (u unknownCSISequenceMsg) String() string {
|
|
return fmt.Sprintf("?CSI%+v?", []byte(u)[2:])
|
|
}
|
|
|
|
var spaceRunes = []rune{' '}
|
|
|
|
// readInputs reads keypress and mouse inputs from a TTY and produces messages
|
|
// containing information about the key or mouse events accordingly.
|
|
func readInputs(ctx context.Context, msgs chan<- Msg, input io.Reader) error {
|
|
var buf [256]byte
|
|
|
|
for {
|
|
// Read and block.
|
|
numBytes, err := input.Read(buf[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b := buf[:numBytes]
|
|
|
|
var i, w int
|
|
for i, w = 0, 0; i < len(b); i += w {
|
|
var msg Msg
|
|
w, msg = detectOneMsg(b[i:])
|
|
select {
|
|
case msgs <- msg:
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
var unknownCSIRe = regexp.MustCompile(`^\x1b\[[\x30-\x3f]*[\x20-\x2f]*[\x40-\x7e]`)
|
|
|
|
func detectOneMsg(b []byte) (w int, msg Msg) {
|
|
// Detect mouse events.
|
|
if len(b) >= 6 && b[0] == '\x1b' && b[1] == '[' && b[2] == 'M' {
|
|
return 6, MouseMsg(parseX10MouseEvent(b))
|
|
}
|
|
|
|
// Detect escape sequence and control characters other than NUL,
|
|
// possibly with an escape character in front to mark the Alt
|
|
// modifier.
|
|
var foundSeq bool
|
|
foundSeq, w, msg = detectSequence(b)
|
|
if foundSeq {
|
|
return
|
|
}
|
|
|
|
// No non-NUL control character or escape sequence.
|
|
// If we are seeing at least an escape character, remember it for later below.
|
|
alt := false
|
|
i := 0
|
|
if b[0] == '\x1b' {
|
|
alt = true
|
|
i++
|
|
}
|
|
|
|
// Are we seeing a standalone NUL? This is not handled by detectSequence().
|
|
if i < len(b) && b[i] == 0 {
|
|
return i + 1, KeyMsg{Type: keyNUL, Alt: alt}
|
|
}
|
|
|
|
// Find the longest sequence of runes that are not control
|
|
// characters from this point.
|
|
var runes []rune
|
|
for rw := 0; i < len(b); i += rw {
|
|
var r rune
|
|
r, rw = utf8.DecodeRune(b[i:])
|
|
if r == utf8.RuneError || r <= rune(keyUS) || r == rune(keyDEL) || r == ' ' {
|
|
// Rune errors are handled below; control characters and spaces will
|
|
// be handled by detectSequence in the next call to detectOneMsg.
|
|
break
|
|
}
|
|
runes = append(runes, r)
|
|
if alt {
|
|
// We only support a single rune after an escape alt modifier.
|
|
i += rw
|
|
break
|
|
}
|
|
}
|
|
// If we found at least one rune, we report the bunch of them as
|
|
// a single KeyRunes or KeySpace event.
|
|
if len(runes) > 0 {
|
|
k := Key{Type: KeyRunes, Runes: runes, Alt: alt}
|
|
if len(runes) == 1 && runes[0] == ' ' {
|
|
k.Type = KeySpace
|
|
}
|
|
return i, KeyMsg(k)
|
|
}
|
|
|
|
// We didn't find an escape sequence, nor a valid rune. Was this a
|
|
// lone escape character at the end of the input?
|
|
if alt && len(b) == 1 {
|
|
return 1, KeyMsg(Key{Type: KeyEscape})
|
|
}
|
|
|
|
// The character at the current position is neither an escape
|
|
// sequence, a valid rune start or a sole escape character. Report
|
|
// it as an invalid byte.
|
|
return 1, unknownInputByteMsg(b[0])
|
|
}
|