forked from tslocum/cview
Oliver
5 years ago
parent
96473a04c6
commit
911fb9543e
@ -0,0 +1,237 @@
|
||||
package tview
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"io"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// The states of the ANSII escape code parser.
|
||||
const (
|
||||
ansiiText = iota
|
||||
ansiiEscape
|
||||
ansiiSubstring
|
||||
ansiiControlSequence
|
||||
)
|
||||
|
||||
// ansii is a io.Writer which translates ANSII escape codes into tview color
|
||||
// tags.
|
||||
type ansii struct {
|
||||
io.Writer
|
||||
|
||||
// Reusable buffers.
|
||||
buffer *bytes.Buffer // The entire output text of one Write().
|
||||
csiParameter, csiIntermediate *bytes.Buffer // Partial CSI strings.
|
||||
|
||||
// The current state of the parser. One of the ansii constants.
|
||||
state int
|
||||
}
|
||||
|
||||
// ANSIIWriter returns an io.Writer which translates any ANSII escape codes
|
||||
// written to it into tview color tags. Other escape codes don't have an effect
|
||||
// and are simply removed. The translated text is written to the provided
|
||||
// writer.
|
||||
func ANSIIWriter(writer io.Writer) io.Writer {
|
||||
return &ansii{
|
||||
Writer: writer,
|
||||
buffer: new(bytes.Buffer),
|
||||
csiParameter: new(bytes.Buffer),
|
||||
csiIntermediate: new(bytes.Buffer),
|
||||
state: ansiiText,
|
||||
}
|
||||
}
|
||||
|
||||
// Write parses the given text as a string of runes, translates ANSII escape
|
||||
// codes to color tags and writes them to the output writer.
|
||||
func (a *ansii) Write(text []byte) (int, error) {
|
||||
defer func() {
|
||||
a.buffer.Reset()
|
||||
}()
|
||||
|
||||
for _, r := range string(text) {
|
||||
switch a.state {
|
||||
|
||||
// We just entered an escape sequence.
|
||||
case ansiiEscape:
|
||||
switch r {
|
||||
case '[': // Control Sequence Introducer.
|
||||
a.csiParameter.Reset()
|
||||
a.csiIntermediate.Reset()
|
||||
a.state = ansiiControlSequence
|
||||
case 'c': // Reset.
|
||||
fmt.Fprint(a.buffer, "[-:-:-]")
|
||||
a.state = ansiiText
|
||||
case 'P', ']', 'X', '^', '_': // Substrings and commands.
|
||||
a.state = ansiiSubstring
|
||||
default: // Ignore.
|
||||
a.state = ansiiText
|
||||
}
|
||||
|
||||
// CSI Sequences.
|
||||
case ansiiControlSequence:
|
||||
switch {
|
||||
case r >= 0x30 && r <= 0x3f: // Parameter bytes.
|
||||
if _, err := a.csiParameter.WriteRune(r); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
case r >= 0x20 && r <= 0x2f: // Intermediate bytes.
|
||||
if _, err := a.csiIntermediate.WriteRune(r); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
case r >= 0x40 && r <= 0x7e: // Final byte.
|
||||
switch r {
|
||||
case 'E': // Next line.
|
||||
count, _ := strconv.Atoi(a.csiParameter.String())
|
||||
if count == 0 {
|
||||
count = 1
|
||||
}
|
||||
fmt.Fprint(a.buffer, strings.Repeat("\n", count))
|
||||
case 'm': // Select Graphic Rendition.
|
||||
var (
|
||||
background, foreground, attributes string
|
||||
clearAttributes bool
|
||||
)
|
||||
fields := strings.Split(a.csiParameter.String(), ";")
|
||||
if len(fields) == 0 || len(fields) == 1 && fields[0] == "0" {
|
||||
// Reset.
|
||||
if _, err := a.buffer.WriteString("[-:-:-]"); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
break
|
||||
}
|
||||
lookupColor := func(colorNumber int, bright bool) string {
|
||||
if colorNumber < 0 || colorNumber > 7 {
|
||||
return "black"
|
||||
}
|
||||
if bright {
|
||||
colorNumber += 8
|
||||
}
|
||||
return [...]string{
|
||||
"black",
|
||||
"red",
|
||||
"green",
|
||||
"yellow",
|
||||
"blue",
|
||||
"darkmagenta",
|
||||
"darkcyan",
|
||||
"white",
|
||||
"#7f7f7f",
|
||||
"#ff0000",
|
||||
"#00ff00",
|
||||
"#ffff00",
|
||||
"#5c5cff",
|
||||
"#ff00ff",
|
||||
"#00ffff",
|
||||
"#ffffff",
|
||||
}[colorNumber]
|
||||
}
|
||||
for index, field := range fields {
|
||||
switch field {
|
||||
case "1", "01":
|
||||
attributes += "b"
|
||||
case "2", "02":
|
||||
attributes += "d"
|
||||
case "4", "04":
|
||||
attributes += "u"
|
||||
case "5", "05":
|
||||
attributes += "l"
|
||||
case "7", "07":
|
||||
attributes += "7"
|
||||
case "22", "24", "25", "27":
|
||||
clearAttributes = true
|
||||
case "30", "31", "32", "33", "34", "35", "36", "37":
|
||||
colorNumber, _ := strconv.Atoi(field)
|
||||
foreground = lookupColor(colorNumber-30, false)
|
||||
case "40", "41", "42", "43", "44", "45", "46", "47":
|
||||
colorNumber, _ := strconv.Atoi(field)
|
||||
background = lookupColor(colorNumber-40, false)
|
||||
case "90", "91", "92", "93", "94", "95", "96", "97":
|
||||
colorNumber, _ := strconv.Atoi(field)
|
||||
foreground = lookupColor(colorNumber-90, true)
|
||||
case "100", "101", "102", "103", "104", "105", "106", "107":
|
||||
colorNumber, _ := strconv.Atoi(field)
|
||||
background = lookupColor(colorNumber-100, true)
|
||||
case "38", "48":
|
||||
var color string
|
||||
if len(fields) > index+1 {
|
||||
if fields[index+1] == "5" && len(fields) > index+2 { // 8-bit colors.
|
||||
colorNumber, _ := strconv.Atoi(fields[index+2])
|
||||
if colorNumber <= 7 {
|
||||
color = lookupColor(colorNumber, false)
|
||||
} else if colorNumber <= 15 {
|
||||
color = lookupColor(colorNumber, true)
|
||||
} else if colorNumber <= 231 {
|
||||
red := (colorNumber - 16) / 36
|
||||
green := ((colorNumber - 16) / 6) % 6
|
||||
blue := (colorNumber - 16) % 6
|
||||
color = fmt.Sprintf("%02x%02x%02x", 255*red/5, 255*green/5, 255*blue/5)
|
||||
} else if colorNumber <= 255 {
|
||||
grey := 255 * (colorNumber - 232) / 23
|
||||
color = fmt.Sprintf("%02x%02x%02x", grey, grey, grey)
|
||||
}
|
||||
} else if fields[index+1] == "2" && len(fields) > index+4 { // 24-bit colors.
|
||||
red, _ := strconv.Atoi(fields[index+2])
|
||||
green, _ := strconv.Atoi(fields[index+3])
|
||||
blue, _ := strconv.Atoi(fields[index+4])
|
||||
color = fmt.Sprintf("%02x%02x%02x", red, green, blue)
|
||||
}
|
||||
}
|
||||
if len(color) > 0 {
|
||||
if field == "38" {
|
||||
foreground = color
|
||||
} else {
|
||||
background = color
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if len(attributes) > 0 || clearAttributes {
|
||||
attributes = ":" + attributes
|
||||
}
|
||||
if len(foreground) > 0 || len(background) > 0 || len(attributes) > 0 {
|
||||
fmt.Fprintf(a.buffer, "[%s:%s%s]", foreground, background, attributes)
|
||||
}
|
||||
}
|
||||
a.state = ansiiText
|
||||
default: // Undefined byte.
|
||||
a.state = ansiiText // Abort CSI.
|
||||
}
|
||||
|
||||
// We just entered a substring/command sequence.
|
||||
case ansiiSubstring:
|
||||
if r == 27 { // Most likely the end of the substring.
|
||||
a.state = ansiiEscape
|
||||
} // Ignore all other characters.
|
||||
|
||||
// "ansiiText" and all others.
|
||||
default:
|
||||
if r == 27 {
|
||||
// This is the start of an escape sequence.
|
||||
a.state = ansiiEscape
|
||||
} else {
|
||||
// Just a regular rune. Send to buffer.
|
||||
if _, err := a.buffer.WriteRune(r); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Write buffer to target writer.
|
||||
n, err := a.buffer.WriteTo(a.Writer)
|
||||
if err != nil {
|
||||
return int(n), err
|
||||
}
|
||||
return len(text), nil
|
||||
}
|
||||
|
||||
// TranslateANSII replaces ANSII escape sequences found in the provided string
|
||||
// with tview's color tags and returns the resulting string.
|
||||
func TranslateANSII(text string) string {
|
||||
var buffer bytes.Buffer
|
||||
writer := ANSIIWriter(&buffer)
|
||||
writer.Write([]byte(text))
|
||||
return buffer.String()
|
||||
}
|
||||
Loading…
Reference in New Issue