mirror of
https://github.com/strongdm/comply
synced 2024-11-09 01:14:53 +00:00
89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
package vtclean
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import (
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"bytes"
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"regexp"
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"strconv"
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)
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// see regex.txt for a slightly separated version of this regex
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var vt100re = regexp.MustCompile(`^\033([\[\]]([\d\?]+)?(;[\d\?]+)*)?(.)`)
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var vt100exc = regexp.MustCompile(`^\033(\[[^a-zA-Z0-9@\?]+|[\(\)]).`)
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// this is to handle the RGB escape generated by `tput initc 1 500 500 500`
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var vt100long = regexp.MustCompile(`^\033](\d+);([^\033]+)\033\\`)
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func Clean(line string, color bool) string {
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var edit = newLineEdit(len(line))
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lineb := []byte(line)
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hadColor := false
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for i := 0; i < len(lineb); {
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c := lineb[i]
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switch c {
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case '\b':
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edit.Move(-1)
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case '\033':
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// set terminal title
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if bytes.HasPrefix(lineb[i:], []byte("\x1b]0;")) {
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pos := bytes.Index(lineb[i:], []byte("\a"))
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if pos != -1 {
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i += pos + 1
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continue
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}
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}
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if m := vt100long.Find(lineb[i:]); m != nil {
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i += len(m)
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} else if m := vt100exc.Find(lineb[i:]); m != nil {
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i += len(m)
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} else if m := vt100re.FindSubmatch(lineb[i:]); m != nil {
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i += len(m[0])
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num := string(m[2])
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n, err := strconv.Atoi(num)
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if err != nil || n > 10000 {
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n = 1
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}
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switch m[4][0] {
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case 'm':
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if color {
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hadColor = true
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edit.Vt100(m[0])
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}
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case '@':
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edit.Insert(bytes.Repeat([]byte{' '}, n))
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case 'G':
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edit.MoveAbs(n)
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case 'C':
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edit.Move(n)
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case 'D':
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edit.Move(-n)
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case 'P':
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edit.Delete(n)
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case 'K':
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switch num {
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case "", "0":
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edit.ClearRight()
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case "1":
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edit.ClearLeft()
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case "2":
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edit.Clear()
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}
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}
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} else {
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i += 1
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}
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continue
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default:
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if c == '\n' || c >= ' ' {
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edit.Write([]byte{c})
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}
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}
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i += 1
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}
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out := edit.Bytes()
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if hadColor {
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out = append(out, []byte("\033[0m")...)
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}
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return string(out)
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}
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