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|
package fzf
import (
"bytes"
"regexp"
"strconv"
"strings"
"unicode/utf8"
)
type ansiOffset struct {
offset [2]int32
color ansiState
}
type ansiState struct {
fg int
bg int
bold bool
}
func (s *ansiState) colored() bool {
return s.fg != -1 || s.bg != -1 || s.bold
}
func (s *ansiState) equals(t *ansiState) bool {
if t == nil {
return !s.colored()
}
return s.fg == t.fg && s.bg == t.bg && s.bold == t.bold
}
var ansiRegex *regexp.Regexp
func init() {
ansiRegex = regexp.MustCompile("\x1b\\[[0-9;]*[mK]")
}
func extractColor(str *string) (*string, []ansiOffset) {
var offsets []ansiOffset
var output bytes.Buffer
var state *ansiState
idx := 0
for _, offset := range ansiRegex.FindAllStringIndex(*str, -1) {
output.WriteString((*str)[idx:offset[0]])
newState := interpretCode((*str)[offset[0]:offset[1]], state)
if !newState.equals(state) {
if state != nil {
// Update last offset
(&offsets[len(offsets)-1]).offset[1] = int32(output.Len())
}
if newState.colored() {
// Append new offset
state = newState
newLen := int32(utf8.RuneCount(output.Bytes()))
offsets = append(offsets, ansiOffset{[2]int32{newLen, newLen}, *state})
} else {
// Discard state
state = nil
}
}
idx = offset[1]
}
rest := (*str)[idx:]
if len(rest) > 0 {
output.WriteString(rest)
if state != nil {
// Update last offset
(&offsets[len(offsets)-1]).offset[1] = int32(utf8.RuneCount(output.Bytes()))
}
}
outputStr := output.String()
return &outputStr, offsets
}
func interpretCode(ansiCode string, prevState *ansiState) *ansiState {
// State
var state *ansiState
if prevState == nil {
state = &ansiState{-1, -1, false}
} else {
state = &ansiState{prevState.fg, prevState.bg, prevState.bold}
}
if ansiCode[len(ansiCode)-1] == 'K' {
return state
}
ptr := &state.fg
state256 := 0
init := func() {
state.fg = -1
state.bg = -1
state.bold = false
state256 = 0
}
ansiCode = ansiCode[2 : len(ansiCode)-1]
if len(ansiCode) == 0 {
init()
}
for _, code := range strings.Split(ansiCode, ";") {
if num, err := strconv.Atoi(code); err == nil {
switch state256 {
case 0:
switch num {
case 38:
ptr = &state.fg
state256++
case 48:
ptr = &state.bg
state256++
case 39:
state.fg = -1
case 49:
state.bg = -1
case 1:
state.bold = true
case 0:
init()
default:
if num >= 30 && num <= 37 {
state.fg = num - 30
} else if num >= 40 && num <= 47 {
state.bg = num - 40
}
}
case 1:
switch num {
case 5:
state256++
default:
state256 = 0
}
case 2:
*ptr = num
state256 = 0
}
}
}
return state
}
|
