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|
package fzf
import (
"bytes"
"regexp"
"strconv"
"strings"
"unicode/utf8"
"github.com/junegunn/fzf/src/tui"
)
type ansiOffset struct {
offset [2]int32
color ansiState
}
type ansiState struct {
fg tui.Color
bg tui.Color
attr tui.Attr
}
func (s *ansiState) colored() bool {
return s.fg != -1 || s.bg != -1 || s.attr > 0
}
func (s *ansiState) equals(t *ansiState) bool {
if t == nil {
return !s.colored()
}
return s.fg == t.fg && s.bg == t.bg && s.attr == t.attr
}
func (s *ansiState) ToString() string {
if !s.colored() {
return ""
}
ret := ""
if s.attr&tui.Bold > 0 {
ret += "1;"
}
if s.attr&tui.Dim > 0 {
ret += "2;"
}
if s.attr&tui.Italic > 0 {
ret += "3;"
}
if s.attr&tui.Underline > 0 {
ret += "4;"
}
if s.attr&tui.Blink > 0 {
ret += "5;"
}
if s.attr&tui.Reverse > 0 {
ret += "7;"
}
ret += toAnsiString(s.fg, 30) + toAnsiString(s.bg, 40)
return "\x1b[" + strings.TrimSuffix(ret, ";") + "m"
}
func toAnsiString(color tui.Color, offset int) string {
col := int(color)
ret := ""
if col == -1 {
ret += strconv.Itoa(offset + 9)
} else if col < 8 {
ret += strconv.Itoa(offset + col)
} else if col < 16 {
ret += strconv.Itoa(offset - 30 + 90 + col - 8)
} else if col < 256 {
ret += strconv.Itoa(offset+8) + ";5;" + strconv.Itoa(col)
} else if col >= (1 << 24) {
r := strconv.Itoa((col >> 16) & 0xff)
g := strconv.Itoa((col >> 8) & 0xff)
b := strconv.Itoa(col & 0xff)
ret += strconv.Itoa(offset+8) + ";2;" + r + ";" + g + ";" + b
}
return ret + ";"
}
var ansiRegex *regexp.Regexp
func init() {
/*
References:
- https://github.com/gnachman/iTerm2
- http://ascii-table.com/ansi-escape-sequences.php
- http://ascii-table.com/ansi-escape-sequences-vt-100.php
- http://tldp.org/HOWTO/Bash-Prompt-HOWTO/x405.html
- https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
*/
// The following regular expression will include not all but most of the
// frequently used ANSI sequences
ansiRegex = regexp.MustCompile("(?:\x1b[\\[()][0-9;]*[a-zA-Z@]|\x1b][0-9];[[:print:]]+(?:\x1b\\\\|\x07)|\x1b.|[\x0e\x0f]|.\x08)")
}
func findAnsiStart(str string) int {
idx := 0
for ; idx < len(str); idx++ {
b := str[idx]
if b == 0x1b || b == 0x0e || b == 0x0f {
return idx
}
if b == 0x08 && idx > 0 {
return idx - 1
}
}
return idx
}
func extractColor(str string, state *ansiState, proc func(string, *ansiState) bool) (string, *[]ansiOffset, *ansiState) {
var offsets []ansiOffset
var output bytes.Buffer
if state != nil {
offsets = append(offsets, ansiOffset{[2]int32{0, 0}, *state})
}
prevIdx := 0
runeCount := 0
for idx := 0; idx < len(str); {
idx += findAnsiStart(str[idx:])
if idx == len(str) {
break
}
// Make sure that we found an ANSI code
offset := ansiRegex.FindStringIndex(str[idx:])
if len(offset) < 2 {
idx++
continue
}
offset[0] += idx
offset[1] += idx
idx = offset[1]
// Check if we should continue
prev := str[prevIdx:offset[0]]
if proc != nil && !proc(prev, state) {
return "", nil, nil
}
prevIdx = offset[1]
runeCount += utf8.RuneCountInString(prev)
output.WriteString(prev)
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(runeCount)
}
if newState.colored() {
// Append new offset
state = newState
offsets = append(offsets, ansiOffset{[2]int32{int32(runeCount), int32(runeCount)}, *state})
} else {
// Discard state
state = nil
}
}
}
var rest string
var trimmed string
if prevIdx == 0 {
// No ANSI code found
rest = str
trimmed = str
} else {
rest = str[prevIdx:]
output.WriteString(rest)
trimmed = output.String()
}
if len(rest) > 0 && state != nil {
// Update last offset
runeCount += utf8.RuneCountInString(rest)
(&offsets[len(offsets)-1]).offset[1] = int32(runeCount)
}
if proc != nil {
proc(rest, state)
}
if len(offsets) == 0 {
return trimmed, nil, state
}
return trimmed, &offsets, state
}
func interpretCode(ansiCode string, prevState *ansiState) *ansiState {
// State
var state *ansiState
if prevState == nil {
state = &ansiState{-1, -1, 0}
} else {
state = &ansiState{prevState.fg, prevState.bg, prevState.attr}
}
if ansiCode[0] != '\x1b' || ansiCode[1] != '[' || ansiCode[len(ansiCode)-1] != 'm' {
return state
}
ptr := &state.fg
state256 := 0
init := func() {
state.fg = -1
state.bg = -1
state.attr = 0
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.
|
