cloudflared-mirror/vendor/github.com/gdamore/tcell/terminfo/terminfo.go

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// Copyright 2019 The TCell Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use file except in compliance with the License.
// You may obtain a copy of the license at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package terminfo
import (
"bytes"
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
"sync"
"time"
)
var (
// ErrTermNotFound indicates that a suitable terminal entry could
// not be found. This can result from either not having TERM set,
// or from the TERM failing to support certain minimal functionality,
// in particular absolute cursor addressability (the cup capability)
// is required. For example, legacy "adm3" lacks this capability,
// whereas the slightly newer "adm3a" supports it. This failure
// occurs most often with "dumb".
ErrTermNotFound = errors.New("terminal entry not found")
)
// Terminfo represents a terminfo entry. Note that we use friendly names
// in Go, but when we write out JSON, we use the same names as terminfo.
// The name, aliases and smous, rmous fields do not come from terminfo directly.
type Terminfo struct {
Name string
Aliases []string
Columns int // cols
Lines int // lines
Colors int // colors
Bell string // bell
Clear string // clear
EnterCA string // smcup
ExitCA string // rmcup
ShowCursor string // cnorm
HideCursor string // civis
AttrOff string // sgr0
Underline string // smul
Bold string // bold
Blink string // blink
Reverse string // rev
Dim string // dim
EnterKeypad string // smkx
ExitKeypad string // rmkx
SetFg string // setaf
SetBg string // setab
SetCursor string // cup
CursorBack1 string // cub1
CursorUp1 string // cuu1
PadChar string // pad
KeyBackspace string // kbs
KeyF1 string // kf1
KeyF2 string // kf2
KeyF3 string // kf3
KeyF4 string // kf4
KeyF5 string // kf5
KeyF6 string // kf6
KeyF7 string // kf7
KeyF8 string // kf8
KeyF9 string // kf9
KeyF10 string // kf10
KeyF11 string // kf11
KeyF12 string // kf12
KeyF13 string // kf13
KeyF14 string // kf14
KeyF15 string // kf15
KeyF16 string // kf16
KeyF17 string // kf17
KeyF18 string // kf18
KeyF19 string // kf19
KeyF20 string // kf20
KeyF21 string // kf21
KeyF22 string // kf22
KeyF23 string // kf23
KeyF24 string // kf24
KeyF25 string // kf25
KeyF26 string // kf26
KeyF27 string // kf27
KeyF28 string // kf28
KeyF29 string // kf29
KeyF30 string // kf30
KeyF31 string // kf31
KeyF32 string // kf32
KeyF33 string // kf33
KeyF34 string // kf34
KeyF35 string // kf35
KeyF36 string // kf36
KeyF37 string // kf37
KeyF38 string // kf38
KeyF39 string // kf39
KeyF40 string // kf40
KeyF41 string // kf41
KeyF42 string // kf42
KeyF43 string // kf43
KeyF44 string // kf44
KeyF45 string // kf45
KeyF46 string // kf46
KeyF47 string // kf47
KeyF48 string // kf48
KeyF49 string // kf49
KeyF50 string // kf50
KeyF51 string // kf51
KeyF52 string // kf52
KeyF53 string // kf53
KeyF54 string // kf54
KeyF55 string // kf55
KeyF56 string // kf56
KeyF57 string // kf57
KeyF58 string // kf58
KeyF59 string // kf59
KeyF60 string // kf60
KeyF61 string // kf61
KeyF62 string // kf62
KeyF63 string // kf63
KeyF64 string // kf64
KeyInsert string // kich1
KeyDelete string // kdch1
KeyHome string // khome
KeyEnd string // kend
KeyHelp string // khlp
KeyPgUp string // kpp
KeyPgDn string // knp
KeyUp string // kcuu1
KeyDown string // kcud1
KeyLeft string // kcub1
KeyRight string // kcuf1
KeyBacktab string // kcbt
KeyExit string // kext
KeyClear string // kclr
KeyPrint string // kprt
KeyCancel string // kcan
Mouse string // kmous
MouseMode string // XM
AltChars string // acsc
EnterAcs string // smacs
ExitAcs string // rmacs
EnableAcs string // enacs
KeyShfRight string // kRIT
KeyShfLeft string // kLFT
KeyShfHome string // kHOM
KeyShfEnd string // kEND
// These are non-standard extensions to terminfo. This includes
// true color support, and some additional keys. Its kind of bizarre
// that shifted variants of left and right exist, but not up and down.
// Terminal support for these are going to vary amongst XTerm
// emulations, so don't depend too much on them in your application.
SetFgBg string // setfgbg
SetFgBgRGB string // setfgbgrgb
SetFgRGB string // setfrgb
SetBgRGB string // setbrgb
KeyShfUp string // shift-up
KeyShfDown string // shift-down
KeyCtrlUp string // ctrl-up
KeyCtrlDown string // ctrl-left
KeyCtrlRight string // ctrl-right
KeyCtrlLeft string // ctrl-left
KeyMetaUp string // meta-up
KeyMetaDown string // meta-left
KeyMetaRight string // meta-right
KeyMetaLeft string // meta-left
KeyAltUp string // alt-up
KeyAltDown string // alt-left
KeyAltRight string // alt-right
KeyAltLeft string // alt-left
KeyCtrlHome string
KeyCtrlEnd string
KeyMetaHome string
KeyMetaEnd string
KeyAltHome string
KeyAltEnd string
KeyAltShfUp string
KeyAltShfDown string
KeyAltShfLeft string
KeyAltShfRight string
KeyMetaShfUp string
KeyMetaShfDown string
KeyMetaShfLeft string
KeyMetaShfRight string
KeyCtrlShfUp string
KeyCtrlShfDown string
KeyCtrlShfLeft string
KeyCtrlShfRight string
KeyCtrlShfHome string
KeyCtrlShfEnd string
KeyAltShfHome string
KeyAltShfEnd string
KeyMetaShfHome string
KeyMetaShfEnd string
}
type stackElem struct {
s string
i int
isStr bool
isInt bool
}
type stack []stackElem
func (st stack) Push(v string) stack {
e := stackElem{
s: v,
isStr: true,
}
return append(st, e)
}
func (st stack) Pop() (string, stack) {
v := ""
if len(st) > 0 {
e := st[len(st)-1]
st = st[:len(st)-1]
if e.isStr {
v = e.s
} else {
v = strconv.Itoa(e.i)
}
}
return v, st
}
func (st stack) PopInt() (int, stack) {
if len(st) > 0 {
e := st[len(st)-1]
st = st[:len(st)-1]
if e.isInt {
return e.i, st
} else if e.isStr {
i, _ := strconv.Atoi(e.s)
return i, st
}
}
return 0, st
}
func (st stack) PopBool() (bool, stack) {
if len(st) > 0 {
e := st[len(st)-1]
st = st[:len(st)-1]
if e.isStr {
if e.s == "1" {
return true, st
}
return false, st
} else if e.i == 1 {
return true, st
} else {
return false, st
}
}
return false, st
}
func (st stack) PushInt(i int) stack {
e := stackElem{
i: i,
isInt: true,
}
return append(st, e)
}
func (st stack) PushBool(i bool) stack {
if i {
return st.PushInt(1)
}
return st.PushInt(0)
}
func nextch(s string, index int) (byte, int) {
if index < len(s) {
return s[index], index + 1
}
return 0, index
}
// static vars
var svars [26]string
// paramsBuffer handles some persistent state for TParam. Technically we
// could probably dispense with this, but caching buffer arrays gives us
// a nice little performance boost. Furthermore, we know that TParam is
// rarely (never?) called re-entrantly, so we can just reuse the same
// buffers, making it thread-safe by stashing a lock.
type paramsBuffer struct {
out bytes.Buffer
buf bytes.Buffer
lk sync.Mutex
}
// Start initializes the params buffer with the initial string data.
// It also locks the paramsBuffer. The caller must call End() when
// finished.
func (pb *paramsBuffer) Start(s string) {
pb.lk.Lock()
pb.out.Reset()
pb.buf.Reset()
pb.buf.WriteString(s)
}
// End returns the final output from TParam, but it also releases the lock.
func (pb *paramsBuffer) End() string {
s := pb.out.String()
pb.lk.Unlock()
return s
}
// NextCh returns the next input character to the expander.
func (pb *paramsBuffer) NextCh() (byte, error) {
return pb.buf.ReadByte()
}
// PutCh "emits" (rather schedules for output) a single byte character.
func (pb *paramsBuffer) PutCh(ch byte) {
pb.out.WriteByte(ch)
}
// PutString schedules a string for output.
func (pb *paramsBuffer) PutString(s string) {
pb.out.WriteString(s)
}
var pb = &paramsBuffer{}
// TParm takes a terminfo parameterized string, such as setaf or cup, and
// evaluates the string, and returns the result with the parameter
// applied.
func (t *Terminfo) TParm(s string, p ...int) string {
var stk stack
var a, b string
var ai, bi int
var ab bool
var dvars [26]string
var params [9]int
pb.Start(s)
// make sure we always have 9 parameters -- makes it easier
// later to skip checks
for i := 0; i < len(params) && i < len(p); i++ {
params[i] = p[i]
}
nest := 0
for {
ch, err := pb.NextCh()
if err != nil {
break
}
if ch != '%' {
pb.PutCh(ch)
continue
}
ch, err = pb.NextCh()
if err != nil {
// XXX Error
break
}
switch ch {
case '%': // quoted %
pb.PutCh(ch)
case 'i': // increment both parameters (ANSI cup support)
params[0]++
params[1]++
case 'c', 's':
// NB: these, and 'd' below are special cased for
// efficiency. They could be handled by the richer
// format support below, less efficiently.
a, stk = stk.Pop()
pb.PutString(a)
case 'd':
ai, stk = stk.PopInt()
pb.PutString(strconv.Itoa(ai))
case '0', '1', '2', '3', '4', 'x', 'X', 'o', ':':
// This is pretty suboptimal, but this is rarely used.
// None of the mainstream terminals use any of this,
// and it would surprise me if this code is ever
// executed outside of test cases.
f := "%"
if ch == ':' {
ch, _ = pb.NextCh()
}
f += string(ch)
for ch == '+' || ch == '-' || ch == '#' || ch == ' ' {
ch, _ = pb.NextCh()
f += string(ch)
}
for (ch >= '0' && ch <= '9') || ch == '.' {
ch, _ = pb.NextCh()
f += string(ch)
}
switch ch {
case 'd', 'x', 'X', 'o':
ai, stk = stk.PopInt()
pb.PutString(fmt.Sprintf(f, ai))
case 'c', 's':
a, stk = stk.Pop()
pb.PutString(fmt.Sprintf(f, a))
}
case 'p': // push parameter
ch, _ = pb.NextCh()
ai = int(ch - '1')
if ai >= 0 && ai < len(params) {
stk = stk.PushInt(params[ai])
} else {
stk = stk.PushInt(0)
}
case 'P': // pop & store variable
ch, _ = pb.NextCh()
if ch >= 'A' && ch <= 'Z' {
svars[int(ch-'A')], stk = stk.Pop()
} else if ch >= 'a' && ch <= 'z' {
dvars[int(ch-'a')], stk = stk.Pop()
}
case 'g': // recall & push variable
ch, _ = pb.NextCh()
if ch >= 'A' && ch <= 'Z' {
stk = stk.Push(svars[int(ch-'A')])
} else if ch >= 'a' && ch <= 'z' {
stk = stk.Push(dvars[int(ch-'a')])
}
case '\'': // push(char)
ch, _ = pb.NextCh()
pb.NextCh() // must be ' but we don't check
stk = stk.Push(string(ch))
case '{': // push(int)
ai = 0
ch, _ = pb.NextCh()
for ch >= '0' && ch <= '9' {
ai *= 10
ai += int(ch - '0')
ch, _ = pb.NextCh()
}
// ch must be '}' but no verification
stk = stk.PushInt(ai)
case 'l': // push(strlen(pop))
a, stk = stk.Pop()
stk = stk.PushInt(len(a))
case '+':
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
stk = stk.PushInt(ai + bi)
case '-':
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
stk = stk.PushInt(ai - bi)
case '*':
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
stk = stk.PushInt(ai * bi)
case '/':
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
if bi != 0 {
stk = stk.PushInt(ai / bi)
} else {
stk = stk.PushInt(0)
}
case 'm': // push(pop mod pop)
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
if bi != 0 {
stk = stk.PushInt(ai % bi)
} else {
stk = stk.PushInt(0)
}
case '&': // AND
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
stk = stk.PushInt(ai & bi)
case '|': // OR
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
stk = stk.PushInt(ai | bi)
case '^': // XOR
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
stk = stk.PushInt(ai ^ bi)
case '~': // bit complement
ai, stk = stk.PopInt()
stk = stk.PushInt(ai ^ -1)
case '!': // logical NOT
ai, stk = stk.PopInt()
stk = stk.PushBool(ai != 0)
case '=': // numeric compare or string compare
b, stk = stk.Pop()
a, stk = stk.Pop()
stk = stk.PushBool(a == b)
case '>': // greater than, numeric
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
stk = stk.PushBool(ai > bi)
case '<': // less than, numeric
bi, stk = stk.PopInt()
ai, stk = stk.PopInt()
stk = stk.PushBool(ai < bi)
case '?': // start conditional
case 't':
ab, stk = stk.PopBool()
if ab {
// just keep going
break
}
nest = 0
ifloop:
// this loop consumes everything until we hit our else,
// or the end of the conditional
for {
ch, err = pb.NextCh()
if err != nil {
break
}
if ch != '%' {
continue
}
ch, _ = pb.NextCh()
switch ch {
case ';':
if nest == 0 {
break ifloop
}
nest--
case '?':
nest++
case 'e':
if nest == 0 {
break ifloop
}
}
}
case 'e':
// if we got here, it means we didn't use the else
// in the 't' case above, and we should skip until
// the end of the conditional
nest = 0
elloop:
for {
ch, err = pb.NextCh()
if err != nil {
break
}
if ch != '%' {
continue
}
ch, _ = pb.NextCh()
switch ch {
case ';':
if nest == 0 {
break elloop
}
nest--
case '?':
nest++
}
}
case ';': // endif
}
}
return pb.End()
}
// TPuts emits the string to the writer, but expands inline padding
// indications (of the form $<[delay]> where [delay] is msec) to
// a suitable time (unless the terminfo string indicates this isn't needed
// by specifying npc - no padding). All Terminfo based strings should be
// emitted using this function.
func (t *Terminfo) TPuts(w io.Writer, s string) {
for {
beg := strings.Index(s, "$<")
if beg < 0 {
// Most strings don't need padding, which is good news!
io.WriteString(w, s)
return
}
io.WriteString(w, s[:beg])
s = s[beg+2:]
end := strings.Index(s, ">")
if end < 0 {
// unterminated.. just emit bytes unadulterated
io.WriteString(w, "$<"+s)
return
}
val := s[:end]
s = s[end+1:]
padus := 0
unit := time.Millisecond
dot := false
loop:
for i := range val {
switch val[i] {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
padus *= 10
padus += int(val[i] - '0')
if dot {
unit /= 10
}
case '.':
if !dot {
dot = true
} else {
break loop
}
default:
break loop
}
}
// Curses historically uses padding to achieve "fine grained"
// delays. We have much better clocks these days, and so we
// do not rely on padding but simply sleep a bit.
if len(t.PadChar) > 0 {
time.Sleep(unit * time.Duration(padus))
}
}
}
// TGoto returns a string suitable for addressing the cursor at the given
// row and column. The origin 0, 0 is in the upper left corner of the screen.
func (t *Terminfo) TGoto(col, row int) string {
return t.TParm(t.SetCursor, row, col)
}
// TColor returns a string corresponding to the given foreground and background
// colors. Either fg or bg can be set to -1 to elide.
func (t *Terminfo) TColor(fi, bi int) string {
rv := ""
// As a special case, we map bright colors to lower versions if the
// color table only holds 8. For the remaining 240 colors, the user
// is out of luck. Someday we could create a mapping table, but its
// not worth it.
if t.Colors == 8 {
if fi > 7 && fi < 16 {
fi -= 8
}
if bi > 7 && bi < 16 {
bi -= 8
}
}
if t.Colors > fi && fi >= 0 {
rv += t.TParm(t.SetFg, fi)
}
if t.Colors > bi && bi >= 0 {
rv += t.TParm(t.SetBg, bi)
}
return rv
}
var (
dblock sync.Mutex
terminfos = make(map[string]*Terminfo)
aliases = make(map[string]string)
)
// AddTerminfo can be called to register a new Terminfo entry.
func AddTerminfo(t *Terminfo) {
dblock.Lock()
terminfos[t.Name] = t
for _, x := range t.Aliases {
terminfos[x] = t
}
dblock.Unlock()
}
// LookupTerminfo attempts to find a definition for the named $TERM.
func LookupTerminfo(name string) (*Terminfo, error) {
if name == "" {
// else on windows: index out of bounds
// on the name[0] reference below
return nil, ErrTermNotFound
}
addtruecolor := false
switch os.Getenv("COLORTERM") {
case "truecolor", "24bit", "24-bit":
addtruecolor = true
}
dblock.Lock()
t := terminfos[name]
dblock.Unlock()
// If the name ends in -truecolor, then fabricate an entry
// from the corresponding -256color, -color, or bare terminal.
if t == nil && strings.HasSuffix(name, "-truecolor") {
suffixes := []string{
"-256color",
"-88color",
"-color",
"",
}
base := name[:len(name)-len("-truecolor")]
for _, s := range suffixes {
if t, _ = LookupTerminfo(base + s); t != nil {
addtruecolor = true
break
}
}
}
if t == nil {
return nil, ErrTermNotFound
}
switch os.Getenv("TCELL_TRUECOLOR") {
case "":
case "disable":
addtruecolor = false
default:
addtruecolor = true
}
// If the user has requested 24-bit color with $COLORTERM, then
// amend the value (unless already present). This means we don't
// need to have a value present.
if addtruecolor &&
t.SetFgBgRGB == "" &&
t.SetFgRGB == "" &&
t.SetBgRGB == "" {
// Supply vanilla ISO 8613-6:1994 24-bit color sequences.
t.SetFgRGB = "\x1b[38;2;%p1%d;%p2%d;%p3%dm"
t.SetBgRGB = "\x1b[48;2;%p1%d;%p2%d;%p3%dm"
t.SetFgBgRGB = "\x1b[38;2;%p1%d;%p2%d;%p3%d;" +
"48;2;%p4%d;%p5%d;%p6%dm"
}
return t, nil
}