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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 (
"strconv"
"github.com/go-errors/errors"
)
type escapeInterpreter struct {
state escapeState
curch rune
csiParam []string
curFgColor, curBgColor Attribute
mode OutputMode
instruction instruction
}
type (
escapeState int
fontEffect int
)
type instruction interface{ isInstruction() }
type eraseInLineFromCursor struct{}
func (self eraseInLineFromCursor) isInstruction() {}
type noInstruction struct{}
func (self noInstruction) isInstruction() {}
const (
stateNone escapeState = iota
stateEscape
stateCSI
stateParams
stateOSC
stateOSCEscape
bold fontEffect = 1
faint fontEffect = 2
italic fontEffect = 3
underline fontEffect = 4
blink fontEffect = 5
reverse fontEffect = 7
strike fontEffect = 9
setForegroundColor int = 38
defaultForegroundColor int = 39
setBackgroundColor int = 48
defaultBackgroundColor int = 49
)
var (
errNotCSI = errors.New("Not a CSI escape sequence")
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(mode OutputMode) *escapeInterpreter {
ei := &escapeInterpreter{
state: stateNone,
curFgColor: ColorDefault,
curBgColor: ColorDefault,
mode: mode,
instruction: noInstruction{},
}
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
}
func (ei *escapeInterpreter) instructionRead() {
ei.instruction = noInstruction{}
}
// 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
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:
switch ch {
case '[':
ei.state = stateCSI
return true, nil
case ']':
ei.state = stateOSC
return true, nil
default:
return false, errNotCSI
}
case stateCSI:
switch {
case ch >= '0' && ch <= '9':
ei.csiParam = append(ei.csiParam, "")
case ch == 'm':
ei.csiParam = append(ei.csiParam, "0")
case ch == 'K':
// fall through
default:
return false, errCSIParseError
}
ei.state = stateParams
fallthrough
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 err := ei.outputCSI(); err != nil {
return false, errCSIParseError
}
ei.state = stateNone
ei.csiParam = nil
return true, nil
case ch == 'K':
p := 0
if len(ei.csiParam) != 0 && ei.csiParam[0] != "" {
p, err = strconv.Atoi(ei.csiParam[0])
if err != nil {
return false, errCSIParseError
}
}
if p == 0 {
ei.instruction = eraseInLineFromCursor{}
} else {
// non-zero values of P not supported
ei.instruction = noInstruction{}
}
ei.state = stateNone
ei.csiParam = nil
return true, nil
default:
return false, errCSIParseError
}
case stateOSC:
switch ch {
case 0x1b:
ei.state = stateOSCEscape
return true, nil
}
return true, nil
case stateOSCEscape:
ei.state = stateNone
return true, nil
}
return false, nil
}
func (ei *escapeInterpreter) outputCSI() error {
n := len(ei.csiParam)
for i := 0; i < n; {
p, err := strconv.Atoi(ei.csiParam[i])
if err != nil {
return errCSIParseError
}
skip := 1
switch {
case p == 0: // reset style and color
ei.curFgColor = ColorDefault
ei.curBgColor = ColorDefault
case p >= 1 && p <= 9: // set style
ei.curFgColor |= getFontEffect(p)
case p >= 21 && p <= 29: // reset style
ei.curFgColor &= ^getFontEffect(p - 20)
case p >= 30 && p <= 37: // set foreground color
ei.curFgColor &= AttrStyleBits
ei.curFgColor |= Get256Color(int32(p) - 30)
case p == setForegroundColor: // set foreground color (256-color or true color)
var color Attribute
var err error
color, skip
|