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package text
import "strings"
// Constants
const (
CSIStartRune = rune(91) // [
CSIStopRune = 'm'
EscapeReset = EscapeStart + "0" + EscapeStop
EscapeStart = "\x1b["
EscapeStartRune = rune(27) // \x1b
EscapeStop = "m"
EscapeStopRune = 'm'
OSIStartRune = rune(93) // ]
OSIStopRune = '\\'
)
type escKind int
const (
escKindUnknown escKind = iota
escKindCSI
escKindOSI
)
type escSeq struct {
isIn bool
content strings.Builder
kind escKind
}
func (e *escSeq) InspectRune(r rune) {
if !e.isIn && r == EscapeStartRune {
e.isIn = true
e.kind = escKindUnknown
e.content.Reset()
e.content.WriteRune(r)
} else if e.isIn {
switch {
case e.kind == escKindUnknown && r == CSIStartRune:
e.kind = escKindCSI
case e.kind == escKindUnknown && r == OSIStartRune:
e.kind = escKindOSI
case e.kind == escKindCSI && r == CSIStopRune || e.kind == escKindOSI && r == OSIStopRune:
e.isIn = false
e.kind = escKindUnknown
}
e.content.WriteRune(r)
}
}
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