259 lines
7.4 KiB
Go
259 lines
7.4 KiB
Go
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package tview
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import (
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"bytes"
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"fmt"
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"io"
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"strconv"
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"strings"
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)
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// The states of the ANSI escape code parser.
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const (
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ansiText = iota
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ansiEscape
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ansiSubstring
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ansiControlSequence
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)
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// ansi is a io.Writer which translates ANSI escape codes into tview color
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// tags.
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type ansi struct {
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io.Writer
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// Reusable buffers.
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buffer *bytes.Buffer // The entire output text of one Write().
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csiParameter, csiIntermediate *bytes.Buffer // Partial CSI strings.
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attributes string // The buffer's current text attributes (a tview attribute string).
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// The current state of the parser. One of the ansi constants.
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state int
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}
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// ANSIWriter returns an io.Writer which translates any ANSI escape codes
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// written to it into tview color tags. Other escape codes don't have an effect
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// and are simply removed. The translated text is written to the provided
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// writer.
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func ANSIWriter(writer io.Writer) io.Writer {
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return &ansi{
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Writer: writer,
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buffer: new(bytes.Buffer),
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csiParameter: new(bytes.Buffer),
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csiIntermediate: new(bytes.Buffer),
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state: ansiText,
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}
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}
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// Write parses the given text as a string of runes, translates ANSI escape
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// codes to color tags and writes them to the output writer.
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func (a *ansi) Write(text []byte) (int, error) {
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defer func() {
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a.buffer.Reset()
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}()
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for _, r := range string(text) {
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switch a.state {
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// We just entered an escape sequence.
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case ansiEscape:
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switch r {
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case '[': // Control Sequence Introducer.
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a.csiParameter.Reset()
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a.csiIntermediate.Reset()
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a.state = ansiControlSequence
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case 'c': // Reset.
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fmt.Fprint(a.buffer, "[-:-:-]")
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a.state = ansiText
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case 'P', ']', 'X', '^', '_': // Substrings and commands.
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a.state = ansiSubstring
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default: // Ignore.
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a.state = ansiText
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}
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// CSI Sequences.
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case ansiControlSequence:
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switch {
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case r >= 0x30 && r <= 0x3f: // Parameter bytes.
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if _, err := a.csiParameter.WriteRune(r); err != nil {
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return 0, err
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}
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case r >= 0x20 && r <= 0x2f: // Intermediate bytes.
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if _, err := a.csiIntermediate.WriteRune(r); err != nil {
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return 0, err
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}
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case r >= 0x40 && r <= 0x7e: // Final byte.
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switch r {
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case 'E': // Next line.
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count, _ := strconv.Atoi(a.csiParameter.String())
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if count == 0 {
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count = 1
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}
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fmt.Fprint(a.buffer, strings.Repeat("\n", count))
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case 'm': // Select Graphic Rendition.
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var background, foreground string
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params := a.csiParameter.String()
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fields := strings.Split(params, ";")
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if len(params) == 0 || len(fields) == 1 && fields[0] == "0" {
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// Reset.
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a.attributes = ""
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if _, err := a.buffer.WriteString("[-:-:-]"); err != nil {
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return 0, err
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}
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break
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}
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lookupColor := func(colorNumber int) string {
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if colorNumber < 0 || colorNumber > 15 {
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return "black"
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}
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return []string{
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"black",
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"maroon",
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"green",
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"olive",
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"navy",
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"purple",
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"teal",
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"silver",
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"gray",
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"red",
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"lime",
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"yellow",
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"blue",
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"fuchsia",
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"aqua",
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"white",
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}[colorNumber]
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}
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FieldLoop:
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for index, field := range fields {
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switch field {
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case "1", "01":
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if strings.IndexRune(a.attributes, 'b') < 0 {
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a.attributes += "b"
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}
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case "2", "02":
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if strings.IndexRune(a.attributes, 'd') < 0 {
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a.attributes += "d"
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}
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case "4", "04":
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if strings.IndexRune(a.attributes, 'u') < 0 {
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a.attributes += "u"
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}
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case "5", "05":
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if strings.IndexRune(a.attributes, 'l') < 0 {
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a.attributes += "l"
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}
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case "22":
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if i := strings.IndexRune(a.attributes, 'b'); i >= 0 {
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a.attributes = a.attributes[:i] + a.attributes[i+1:]
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}
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if i := strings.IndexRune(a.attributes, 'd'); i >= 0 {
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a.attributes = a.attributes[:i] + a.attributes[i+1:]
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}
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case "24":
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if i := strings.IndexRune(a.attributes, 'u'); i >= 0 {
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a.attributes = a.attributes[:i] + a.attributes[i+1:]
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}
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case "25":
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if i := strings.IndexRune(a.attributes, 'l'); i >= 0 {
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a.attributes = a.attributes[:i] + a.attributes[i+1:]
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}
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case "30", "31", "32", "33", "34", "35", "36", "37":
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colorNumber, _ := strconv.Atoi(field)
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foreground = lookupColor(colorNumber - 30)
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case "39":
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foreground = "-"
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case "40", "41", "42", "43", "44", "45", "46", "47":
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colorNumber, _ := strconv.Atoi(field)
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background = lookupColor(colorNumber - 40)
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case "49":
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background = "-"
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case "90", "91", "92", "93", "94", "95", "96", "97":
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colorNumber, _ := strconv.Atoi(field)
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foreground = lookupColor(colorNumber - 82)
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case "100", "101", "102", "103", "104", "105", "106", "107":
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colorNumber, _ := strconv.Atoi(field)
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background = lookupColor(colorNumber - 92)
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case "38", "48":
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var color string
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if len(fields) > index+1 {
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if fields[index+1] == "5" && len(fields) > index+2 { // 8-bit colors.
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colorNumber, _ := strconv.Atoi(fields[index+2])
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if colorNumber <= 15 {
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color = lookupColor(colorNumber)
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} else if colorNumber <= 231 {
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red := (colorNumber - 16) / 36
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green := ((colorNumber - 16) / 6) % 6
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blue := (colorNumber - 16) % 6
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color = fmt.Sprintf("#%02x%02x%02x", 255*red/5, 255*green/5, 255*blue/5)
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} else if colorNumber <= 255 {
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grey := 255 * (colorNumber - 232) / 23
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color = fmt.Sprintf("#%02x%02x%02x", grey, grey, grey)
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}
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} else if fields[index+1] == "2" && len(fields) > index+4 { // 24-bit colors.
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red, _ := strconv.Atoi(fields[index+2])
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green, _ := strconv.Atoi(fields[index+3])
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blue, _ := strconv.Atoi(fields[index+4])
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color = fmt.Sprintf("#%02x%02x%02x", red, green, blue)
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}
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}
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if len(color) > 0 {
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if field == "38" {
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foreground = color
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} else {
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background = color
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}
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}
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break FieldLoop
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}
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}
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var colon string
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if len(a.attributes) > 0 {
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colon = ":"
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}
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if len(foreground) > 0 || len(background) > 0 || len(a.attributes) > 0 {
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fmt.Fprintf(a.buffer, "[%s:%s%s%s]", foreground, background, colon, a.attributes)
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}
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}
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a.state = ansiText
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default: // Undefined byte.
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a.state = ansiText // Abort CSI.
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}
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// We just entered a substring/command sequence.
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case ansiSubstring:
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if r == 27 { // Most likely the end of the substring.
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a.state = ansiEscape
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} // Ignore all other characters.
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// "ansiText" and all others.
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default:
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if r == 27 {
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// This is the start of an escape sequence.
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a.state = ansiEscape
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} else {
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// Just a regular rune. Send to buffer.
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if _, err := a.buffer.WriteRune(r); err != nil {
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return 0, err
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}
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}
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}
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}
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// Write buffer to target writer.
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n, err := a.buffer.WriteTo(a.Writer)
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if err != nil {
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return int(n), err
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}
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return len(text), nil
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}
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// TranslateANSI replaces ANSI escape sequences found in the provided string
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// with tview's color tags and returns the resulting string.
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func TranslateANSI(text string) string {
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var buffer bytes.Buffer
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writer := ANSIWriter(&buffer)
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writer.Write([]byte(text))
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return buffer.String()
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}
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