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// Copyright 2014 The gocui Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gocui
import (
"errors"
"strconv"
)
type escapeInterpreter struct {
state escapeState
curch rune
csiParam []string
curFgColor, curBgColor Attribute
}
type escapeState int
const (
stateNone escapeState = iota
stateEscape
stateCSI
stateParams
)
var (
errNotCSI = errors.New("Not a CSI escape sequence")
errCSINotANumber = errors.New("CSI escape sequence was expecting a number or a ;")
errCSIParseError = errors.New("CSI escape sequence parsing error")
errCSITooLong = errors.New("CSI escape sequence is too long")
)
// runes in case of error will output the non-parsed runes as a string.
func (ei *escapeInterpreter) runes() []rune {
switch ei.state {
case stateNone:
return []rune{0x1b}
case stateEscape:
return []rune{0x1b, ei.curch}
case stateCSI:
return []rune{0x1b, '[', ei.curch}
case stateParams:
ret := []rune{0x1b, '['}
for _, s := range ei.csiParam {
ret = append(ret, []rune(s)...)
ret = append(ret, ';')
}
return append(ret, ei.curch)
}
return nil
}
// newEscapeInterpreter returns an escapeInterpreter that will be able to parse
// terminal escape sequences.
func newEscapeInterpreter() *escapeInterpreter {
ei := &escapeInterpreter{
state: stateNone,
curFgColor: ColorDefault,
curBgColor: ColorDefault,
}
return ei
}
// reset sets the escapeInterpreter in initial state.
func (ei *escapeInterpreter) reset() {
ei.state = stateNone
ei.curFgColor = ColorDefault
ei.curBgColor = ColorDefault
ei.csiParam = nil
}
// paramToColor returns an attribute given a terminfo coloring.
func paramToColor(p int) Attribute {
switch p {
case 0:
return ColorBlack
case 1:
return ColorRed
case 2:
return ColorGreen
case 3:
return ColorYellow
case 4:
return ColorBlue
case 5:
return ColorMagenta
case 6:
return ColorCyan
case 7:
return ColorWhite
}
return ColorDefault
}
// parseOne parses a rune. If isEscape is true, it means that the rune is part
// of an escape sequence, and as such should not be printed verbatim. Otherwise,
// it's not an escape sequence.
func (ei *escapeInterpreter) parseOne(ch rune) (isEscape bool, err error) {
// Sanity checks to make sure we're not parsing something totally bogus.
if len(ei.csiParam) > 20 {
return false, errCSITooLong
}
if len(ei.csiParam) > 0 && len(ei.csiParam[len(ei.csiParam)-1]) > 255 {
return false, errCSITooLong
}
ei.curch = ch
switch ei.state {
case stateNone:
if ch == 0x1b {
ei.state = stateEscape
return true, nil
}
return false, nil
case stateEscape:
if ch == '[' {
ei.state = stateCSI
return true, nil
}
return false, errNotCSI
case stateCSI:
if ch >= '0' && ch <= '9' {
ei.state = stateParams
ei.csiParam = append(ei.csiParam, string(ch))
return true, nil
}
return false, errCSINotANumber
case stateParams:
switch {
case ch >= '0' && ch <= '9':
ei.csiParam[len(ei.csiParam)-1] += string(ch)
return true, nil
case ch == ';':
ei.csiParam = append(ei.csiParam, "")
return true, nil
case ch == 'm':
if len(ei.csiParam) < 1 {
return false, errCSIParseError
}
for _, param := range ei.csiParam {
p, err := strconv.Atoi(param)
if err != nil {
return false, errCSIParseError
}
switch {
case p >= 30 && p <= 37:
ei.curFgColor = paramToColor(p - 30)
case p >= 40 && p <= 47:
ei.curBgColor = paramToColor(p - 40)
case p == 1:
ei.curFgColor |= AttrBold
case p == 4:
ei.curFgColor |= AttrUnderline
case p == 7:
ei.curFgColor |= AttrReverse
case p == 0 || p == 39:
ei.curFgColor = ColorDefault
ei.curBgColor = ColorDefault
}
}
ei.state = stateNone
ei.csiParam = nil
return true, nil
}
}
return false, nil
}
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