mirror of https://github.com/docker/cli.git
98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
|
package vt100
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
"unicode"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Decode decodes one ANSI terminal command from s.
|
||
|
|
//
|
||
|
|
// s should be connected to a client program that expects an
|
||
|
|
// ANSI terminal on the other end. It will push bytes to us that we are meant
|
||
|
|
// to intepret as terminal control codes, or text to place onto the terminal.
|
||
|
|
//
|
||
|
|
// This Command alone does not actually update the terminal. You need to pass
|
||
|
|
// it to VT100.Process().
|
||
|
|
//
|
||
|
|
// You should not share s with any other reader, because it could leave
|
||
|
|
// the stream in an invalid state.
|
||
|
|
func Decode(s io.RuneScanner) (Command, error) {
|
||
|
|
r, size, err := s.ReadRune()
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if r == unicode.ReplacementChar && size == 1 {
|
||
|
|
return nil, fmt.Errorf("non-utf8 data from reader")
|
||
|
|
}
|
||
|
|
|
||
|
|
if r == escape || r == monogramCsi { // At beginning of escape sequence.
|
||
|
|
s.UnreadRune()
|
||
|
|
return scanEscapeCommand(s)
|
||
|
|
}
|
||
|
|
|
||
|
|
if unicode.IsControl(r) {
|
||
|
|
return controlCommand(r), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
return runeCommand(r), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
const (
|
||
|
|
// There are two ways to begin an escape sequence. One is to put the escape byte.
|
||
|
|
// The other is to put the single-rune control sequence indicator, which is equivalent
|
||
|
|
// to putting "\u001b[".
|
||
|
|
escape = '\u001b'
|
||
|
|
monogramCsi = '\u009b'
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
csEnd = &unicode.RangeTable{R16: []unicode.Range16{{Lo: 64, Hi: 126, Stride: 1}}}
|
||
|
|
)
|
||
|
|
|
||
|
|
// scanEscapeCommand scans to the end of the current escape sequence. The scanner
|
||
|
|
// must be positioned at an escape rune (esc or the unicode CSI).
|
||
|
|
func scanEscapeCommand(s io.RuneScanner) (Command, error) {
|
||
|
|
csi := false
|
||
|
|
esc, _, err := s.ReadRune()
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if esc != escape && esc != monogramCsi {
|
||
|
|
return nil, fmt.Errorf("invalid content")
|
||
|
|
}
|
||
|
|
if esc == monogramCsi {
|
||
|
|
csi = true
|
||
|
|
}
|
||
|
|
|
||
|
|
var args bytes.Buffer
|
||
|
|
quote := false
|
||
|
|
for i := 0; ; i++ {
|
||
|
|
r, _, err := s.ReadRune()
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if i == 0 && r == '[' {
|
||
|
|
csi = true
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
if !csi {
|
||
|
|
return escapeCommand{r, ""}, nil
|
||
|
|
} else if quote == false && unicode.Is(csEnd, r) {
|
||
|
|
return escapeCommand{r, args.String()}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
if r == '"' {
|
||
|
|
quote = !quote
|
||
|
|
}
|
||
|
|
|
||
|
|
// Otherwise, we're still in the args, and this rune is one of those args.
|
||
|
|
if _, err := args.WriteRune(r); err != nil {
|
||
|
|
panic(err) // WriteRune cannot return an error from bytes.Buffer.
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|