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// Copyright 2016 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 tcell
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"path"
"strconv"
"strings"
"sync"
)
// 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 `json:"name"`
Aliases []string `json:"aliases,omitempty"`
Columns int `json:"cols,omitempty"` // cols
Lines int `json:"lines,omitempty"` // lines
Colors int `json:"colors,omitempty"` // colors
Bell string `json:"bell,omitempty"` // bell
Clear string `json:"clear,omitempty"` // clear
EnterCA string `json:"smcup,omitempty"` // smcup
ExitCA string `json:"rmcup,omitempty"` // rmcup
ShowCursor string `json:"cnorm,omitempty"` // cnorm
HideCursor string `json:"civis,omitempty"` // civis
AttrOff string `json:"sgr0,omitempty"` // sgr0
Underline string `json:"smul,omitempty"` // smul
Bold string `json:"bold,omitempty"` // bold
Blink string `json:"blink,omitempty"` // blink
Reverse string `json:"rev,omitempty"` // rev
Dim string `json:"dim,omitempty"` // dim
EnterKeypad string `json:"smkx,omitempty"` // smkx
ExitKeypad string `json:"rmkx,omitempty"` // rmkx
SetFg string `json:"setaf,omitempty"` // setaf
SetBg string `json:"setbg,omitempty"` // setab
SetCursor string `json:"cup,omitempty"` // cup
CursorBack1 string `json:"cub1,omitempty"` // cub1
CursorUp1 string `json:"cuu1,omitempty"` // cuu1
PadChar string `json:"pad,omitempty"` // pad
KeyBackspace string `json:"kbs,omitempty"` // kbs
KeyF1 string `json:"kf1,omitempty"` // kf1
KeyF2 string `json:"kf2,omitempty"` // kf2
KeyF3 string `json:"kf3,omitempty"` // kf3
KeyF4 string `json:"kf4,omitempty"` // kf4
KeyF5 string `json:"kf5,omitempty"` // kf5
KeyF6 string `json:"kf6,omitempty"` // kf6
KeyF7 string `json:"kf7,omitempty"` // kf7
KeyF8 string `json:"kf8,omitempty"` // kf8
KeyF9 string `json:"kf9,omitempty"` // kf9
KeyF10 string `json:"kf10,omitempty"` // kf10
KeyF11 string `json:"kf11,omitempty"` // kf11
KeyF12 string `json:"kf12,omitempty"` // kf12
KeyF13 string `json:"kf13,omitempty"` // kf13
KeyF14 string `json:"kf14,omitempty"` // kf14
KeyF15 string `json:"kf15,omitempty"` // kf15
KeyF16 string `json:"kf16,omitempty"` // kf16
KeyF17 string `json:"kf17,omitempty"` // kf17
KeyF18 string `json:"kf18,omitempty"` // kf18
KeyF19 string `json:"kf19,omitempty"` // kf19
KeyF20 string `json:"kf20,omitempty"` // kf20
KeyF21 string `json:"kf21,omitempty"` // kf21
KeyF22 string `json:"kf22,omitempty"` // kf22
KeyF23 string `json:"kf23,omitempty"` // kf23
KeyF24 string `json:"kf24,omitempty"` // kf24
KeyF25 string `json:"kf25,omitempty"` // kf25
KeyF26 string `json:"kf26,omitempty"` // kf26
KeyF27 string `json:"kf27,omitempty"` // kf27
KeyF28 string `json:"kf28,omitempty"` // kf28
KeyF29 string `json:"kf29,omitempty"` // kf29
KeyF30 string `json:"kf30,omitempty"` // kf30
KeyF31 string `json:"kf31,omitempty"` // kf31
KeyF32 string `json:"kf32,omitempty"` // kf32
KeyF33 string `json:"kf33,omitempty"` // kf33
KeyF34 string `json:"kf34,omitempty"` // kf34
KeyF35 string `json:"kf35,omitempty"` // kf35
KeyF36 string `json:"kf36,omitempty"` // kf36
KeyF37 string `json:"kf37,omitempty"` // kf37
KeyF38 string `json:"kf38,omitempty"` // kf38
KeyF39 string `json:"kf39,omitempty"` // kf39
KeyF40 string `json:"kf40,omitempty"` // kf40
KeyF41 string `json:"kf41,omitempty"` // kf41
KeyF42 string `json:"kf42,omitempty"` // kf42
KeyF43 string `json:"kf43,omitempty"` // kf43
KeyF44 string `json:"kf44,omitempty"` // kf44
KeyF45 string `json:"kf45,omitempty"` // kf45
KeyF46 string `json:"kf46,omitempty"` // kf46
KeyF47 string `json:"kf47,omitempty"` // kf47
KeyF48 string `json:"kf48,omitempty"` // kf48
KeyF49 string `json:"kf49,omitempty"` // kf49
KeyF50 string `json:"kf50,omitempty"` // kf50
KeyF51 string `json:"kf51,omitempty"` // kf51
KeyF52 string `json:"kf52,omitempty"` // kf52
KeyF53 string `json:"kf53,omitempty"` // kf53
KeyF54 string `json:"kf54,omitempty"` // kf54
KeyF55 string `json:"kf55,omitempty"` // kf55
KeyF56 string `json:"kf56,omitempty"` // kf56
KeyF57 string `json:"kf57,omitempty"` // kf57
KeyF58 string `json:"kf58,omitempty"` // kf58
KeyF59 string `json:"kf59,omitempty"` // kf59
KeyF60 string `json:"kf60,omitempty"` // kf60
KeyF61 string `json:"kf61,omitempty"` // kf61
KeyF62 string `json:"kf62,omitempty"` // kf62
KeyF63 string `json:"kf63,omitempty"` // kf63
KeyF64 string `json:"kf64,omitempty"` // kf64
KeyInsert string `json:"kich,omitempty"` // kich1
KeyDelete string `json:"kdch,omitempty"` // kdch1
KeyHome string `json:"khome,omitempty"` // khome
KeyEnd string `json:"kend,omitempty"` // kend
KeyHelp string `json:"khlp,omitempty"` // khlp
KeyPgUp string `json:"kpp,omitempty"` // kpp
KeyPgDn string `json:"knp,omitempty"` // knp
KeyUp string `json:"kcuu1,omitempty"` // kcuu1
KeyDown string `json:"kcud1,omitempty"` // kcud1
KeyLeft string `json:"kcub1,omitempty"` // kcub1
KeyRight string `json:"kcuf1,omitempty"` // kcuf1
KeyBacktab string `json:"kcbt,omitempty"` // kcbt
KeyExit string `json:"kext,omitempty"` // kext
KeyClear string `json:"kclr,omitempty"` // kclr
KeyPrint string `json:"kprt,omitempty"` // kprt
KeyCancel string `json:"kcan,omitempty"` // kcan
Mouse string `json:"kmous,omitempty"` // kmous
MouseMode string `json:"XM,omitempty"` // XM
AltChars string `json:"acsc,omitempty"` // acsc
EnterAcs string `json:"smacs,omitempty"` // smacs
ExitAcs string `json:"rmacs,omitempty"` // rmacs
EnableAcs string `json:"enacs,omitempty"` // enacs
KeyShfRight string `json:"kRIT,omitempty"` // kRIT
KeyShfLeft string `json:"kLFT,omitempty"` // kLFT
KeyShfHome string `json:"kHOM,omitempty"` // kHOM
KeyShfEnd string `json:"kEND,omitempty"` // 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 `json:"_setfgbg,omitempty"` // setfgbg
SetFgBgRGB string `json:"_setfgbgrgb,omitempty"` // setfgbgrgb
SetFgRGB string `json:"_setfrgb,omitempty"` // setfrgb
SetBgRGB string `json:"_setbrgb,omitempty"` // setbrgb
KeyShfUp string `json:"_kscu1,omitempty"` // shift-up
KeyShfDown string `json:"_kscud1,omitempty"` // shift-down
KeyCtrlUp string `json:"_kccu1,omitempty"` // ctrl-up
KeyCtrlDown string `json:"_kccud1,omitempty"` // ctrl-left
KeyCtrlRight string `json:"_kccuf1,omitempty"` // ctrl-right
KeyCtrlLeft string `json:"_kccub1,omitempty"` // ctrl-left
KeyMetaUp string `json:"_kmcu1,omitempty"` // meta-up
KeyMetaDown string `json:"_kmcud1,omitempty"` // meta-left
KeyMetaRight string `json:"_kmcuf1,omitempty"` // meta-right
KeyMetaLeft string `json:"_kmcub1,omitempty"` // meta-left
KeyAltUp string `json:"_kacu1,omitempty"` // alt-up
KeyAltDown string `json:"_kacud1,omitempty"` // alt-left
KeyAltRight string `json:"_kacuf1,omitempty"` // alt-right
KeyAltLeft string `json:"_kacub1,omitempty"` // alt-left
KeyCtrlHome string `json:"_kchome,omitempty"`
KeyCtrlEnd string `json:"_kcend,omitempty"`
KeyMetaHome string `json:"_kmhome,omitempty"`
KeyMetaEnd string `json:"_kmend,omitempty"`
KeyAltHome string `json:"_kahome,omitempty"`
KeyAltEnd string `json:"_kaend,omitempty"`
KeyAltShfUp string `json:"_kascu1,omitempty"`
KeyAltShfDown string `json:"_kascud1,omitempty"`
KeyAltShfLeft string `json:"_kascub1,omitempty"`
KeyAltShfRight string `json:"_kascuf1,omitempty"`
KeyMetaShfUp string `json:"_kmscu1,omitempty"`
KeyMetaShfDown string `json:"_kmscud1,omitempty"`
KeyMetaShfLeft string `json:"_kmscub1,omitempty"`
KeyMetaShfRight string `json:"_kmscuf1,omitempty"`
KeyCtrlShfUp string `json:"_kcscu1,omitempty"`
KeyCtrlShfDown string `json:"_kcscud1,omitempty"`
KeyCtrlShfLeft string `json:"_kcscub1,omitempty"`
KeyCtrlShfRight string `json:"_kcscuf1,omitempty"`
KeyCtrlShfHome string `json:"_kcHOME,omitempty"`
KeyCtrlShfEnd string `json:"_kcEND,omitempty"`
KeyAltShfHome string `json:"_kaHOME,omitempty"`
KeyAltShfEnd string `json:"_kaEND,omitempty"`
KeyMetaShfHome string `json:"_kmHOME,omitempty"`
KeyMetaShfEnd string `json:"_kmEND,omitempty"`
}
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
} else {
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 $<[delay]> where [delay] is msec) to
// a suitable number of padding characters (usually null bytes) based
// upon the supplied baud. At high baud rates, more padding characters
// will be inserted. All Terminfo based strings should be emitted using
// this function.
func (t *Terminfo) TPuts(w io.Writer, s string, baud int) {
for {
beg := strings.Index(s, "$<")
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 := 1000
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
}
}
cnt := int(((baud / 8) * padus) / unit)
for cnt > 0 {
io.WriteString(w, t.PadChar)
cnt--
}
}
}
// 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(fg, bg Color) string {
fi := int(fg)
bi := int(bg)
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()
}
func loadFromFile(fname string, term string) (*Terminfo, error) {
f, e := os.Open(fname)
if e != nil {
return nil, e
}
d := json.NewDecoder(f)
for {
t := &Terminfo{}
if e := d.Decode(t); e != nil {
if e == io.EOF {
return nil, ErrTermNotFound
}
return nil, e
}
if t.Name == term {
return t, nil
}
}
}
// LookupTerminfo attempts to find a definition for the named $TERM.
// It first looks in the builtin database, which should cover just about
// everyone. If it can't find one there, then it will attempt to read
// one from the JSON file located in either $TCELLDB, $HOME/.tcelldb
// or in this package's source directory as database.json).
func LookupTerminfo(name string) (*Terminfo, error) {
dblock.Lock()
t := terminfos[name]
dblock.Unlock()
if t == nil {
// Load the database located here. Its expected that TCELLSDB
// points either to a single JSON file.
if pth := os.Getenv("TCELLDB"); pth != "" {
t, _ = loadFromFile(pth, name)
}
if t == nil {
if pth := os.Getenv("HOME"); pth != "" {
fname := path.Join(pth, ".tcelldb")
t, _ = loadFromFile(fname, name)
}
}
if t == nil {
gopath := strings.Split(os.Getenv("GOPATH"),
string(os.PathListSeparator))
fname := path.Join("src",
"github.com", "gdamore", "tcell",
"database.json")
for _, pth := range gopath {
t, _ = loadFromFile(path.Join(pth, fname), name)
if t != nil {
break
}
}
}
if t != nil {
dblock.Lock()
terminfos[name] = t
dblock.Unlock()
}
}
if t == nil {
return nil, ErrTermNotFound
}
return t, nil
}
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