mirror of
https://github.com/ergochat/ergo.git
synced 2024-11-11 06:29:29 +01:00
318 lines
8.0 KiB
Go
318 lines
8.0 KiB
Go
// written by Daniel Oaks <daniel@danieloaks.net>
|
|
// released under the ISC license
|
|
|
|
package ircfmt
|
|
|
|
import (
|
|
"regexp"
|
|
"strings"
|
|
)
|
|
|
|
const (
|
|
// raw bytes and strings to do replacing with
|
|
bold string = "\x02"
|
|
colour string = "\x03"
|
|
monospace string = "\x11"
|
|
reverseColour string = "\x16"
|
|
italic string = "\x1d"
|
|
strikethrough string = "\x1e"
|
|
underline string = "\x1f"
|
|
reset string = "\x0f"
|
|
|
|
runecolour rune = '\x03'
|
|
runebold rune = '\x02'
|
|
runemonospace rune = '\x11'
|
|
runereverseColour rune = '\x16'
|
|
runeitalic rune = '\x1d'
|
|
runestrikethrough rune = '\x1e'
|
|
runereset rune = '\x0f'
|
|
runeunderline rune = '\x1f'
|
|
|
|
// valid characters in a colour code character, for speed
|
|
colours1 string = "0123456789"
|
|
)
|
|
|
|
var (
|
|
// valtoescape replaces most of IRC characters with our escapes.
|
|
valtoescape = strings.NewReplacer("$", "$$", colour, "$c", reverseColour, "$v", bold, "$b", italic, "$i", strikethrough, "$s", underline, "$u", monospace, "$m", reset, "$r")
|
|
// valToStrip replaces most of the IRC characters with nothing
|
|
valToStrip = strings.NewReplacer(colour, "$c", reverseColour, "", bold, "", italic, "", strikethrough, "", underline, "", monospace, "", reset, "")
|
|
|
|
// escapetoval contains most of our escapes and how they map to real IRC characters.
|
|
// intentionally skips colour, since that's handled elsewhere.
|
|
escapetoval = map[rune]string{
|
|
'$': "$",
|
|
'b': bold,
|
|
'i': italic,
|
|
'v': reverseColour,
|
|
's': strikethrough,
|
|
'u': underline,
|
|
'm': monospace,
|
|
'r': reset,
|
|
}
|
|
|
|
// valid colour codes
|
|
numtocolour = map[string]string{
|
|
"99": "default",
|
|
"15": "light grey",
|
|
"14": "grey",
|
|
"13": "pink",
|
|
"12": "light blue",
|
|
"11": "light cyan",
|
|
"10": "cyan",
|
|
"09": "light green",
|
|
"08": "yellow",
|
|
"07": "orange",
|
|
"06": "magenta",
|
|
"05": "brown",
|
|
"04": "red",
|
|
"03": "green",
|
|
"02": "blue",
|
|
"01": "black",
|
|
"00": "white",
|
|
"9": "light green",
|
|
"8": "yellow",
|
|
"7": "orange",
|
|
"6": "magenta",
|
|
"5": "brown",
|
|
"4": "red",
|
|
"3": "green",
|
|
"2": "blue",
|
|
"1": "black",
|
|
"0": "white",
|
|
}
|
|
|
|
colourcodesTruncated = map[string]string{
|
|
"white": "0",
|
|
"black": "1",
|
|
"blue": "2",
|
|
"green": "3",
|
|
"red": "4",
|
|
"brown": "5",
|
|
"magenta": "6",
|
|
"orange": "7",
|
|
"yellow": "8",
|
|
"light green": "9",
|
|
"cyan": "10",
|
|
"light cyan": "11",
|
|
"light blue": "12",
|
|
"pink": "13",
|
|
"grey": "14",
|
|
"light grey": "15",
|
|
"default": "99",
|
|
}
|
|
|
|
bracketedExpr = regexp.MustCompile(`^\[.*?\]`)
|
|
colourDigits = regexp.MustCompile(`^[0-9]{1,2}$`)
|
|
)
|
|
|
|
// Escape takes a raw IRC string and returns it with our escapes.
|
|
//
|
|
// IE, it turns this: "This is a \x02cool\x02, \x034red\x0f message!"
|
|
// into: "This is a $bcool$b, $c[red]red$r message!"
|
|
func Escape(in string) string {
|
|
// replace all our usual escapes
|
|
in = valtoescape.Replace(in)
|
|
|
|
inRunes := []rune(in)
|
|
//var out string
|
|
out := strings.Builder{}
|
|
for 0 < len(inRunes) {
|
|
if 1 < len(inRunes) && inRunes[0] == '$' && inRunes[1] == 'c' {
|
|
// handle colours
|
|
out.WriteString("$c")
|
|
inRunes = inRunes[2:] // strip colour code chars
|
|
|
|
if len(inRunes) < 1 || !strings.Contains(colours1, string(inRunes[0])) {
|
|
out.WriteString("[]")
|
|
continue
|
|
}
|
|
|
|
var foreBuffer, backBuffer string
|
|
foreBuffer += string(inRunes[0])
|
|
inRunes = inRunes[1:]
|
|
if 0 < len(inRunes) && strings.Contains(colours1, string(inRunes[0])) {
|
|
foreBuffer += string(inRunes[0])
|
|
inRunes = inRunes[1:]
|
|
}
|
|
if 1 < len(inRunes) && inRunes[0] == ',' && strings.Contains(colours1, string(inRunes[1])) {
|
|
backBuffer += string(inRunes[1])
|
|
inRunes = inRunes[2:]
|
|
if 0 < len(inRunes) && strings.Contains(colours1, string(inRunes[0])) {
|
|
backBuffer += string(inRunes[0])
|
|
inRunes = inRunes[1:]
|
|
}
|
|
}
|
|
|
|
foreName, exists := numtocolour[foreBuffer]
|
|
if !exists {
|
|
foreName = foreBuffer
|
|
}
|
|
backName, exists := numtocolour[backBuffer]
|
|
if !exists {
|
|
backName = backBuffer
|
|
}
|
|
|
|
out.WriteRune('[')
|
|
out.WriteString(foreName)
|
|
if backName != "" {
|
|
out.WriteRune(',')
|
|
out.WriteString(backName)
|
|
}
|
|
out.WriteRune(']')
|
|
|
|
} else {
|
|
// special case for $$c
|
|
if len(inRunes) > 2 && inRunes[0] == '$' && inRunes[1] == '$' && inRunes[2] == 'c' {
|
|
out.WriteRune(inRunes[0])
|
|
out.WriteRune(inRunes[1])
|
|
out.WriteRune(inRunes[2])
|
|
inRunes = inRunes[3:]
|
|
} else {
|
|
out.WriteRune(inRunes[0])
|
|
inRunes = inRunes[1:]
|
|
}
|
|
}
|
|
}
|
|
|
|
return out.String()
|
|
}
|
|
|
|
// Strip takes a raw IRC string and removes it with all formatting codes removed
|
|
// IE, it turns this: "This is a \x02cool\x02, \x034red\x0f message!"
|
|
// into: "This is a cool, red message!"
|
|
func Strip(in string) string {
|
|
out := strings.Builder{}
|
|
runes := []rune(in)
|
|
if out.Len() < len(runes) { // Reduce allocations where needed
|
|
out.Grow(len(in) - out.Len())
|
|
}
|
|
for len(runes) > 0 {
|
|
switch runes[0] {
|
|
case runebold, runemonospace, runereverseColour, runeitalic, runestrikethrough, runeunderline, runereset:
|
|
runes = runes[1:]
|
|
case runecolour:
|
|
runes = removeColour(runes)
|
|
default:
|
|
out.WriteRune(runes[0])
|
|
runes = runes[1:]
|
|
}
|
|
}
|
|
return out.String()
|
|
}
|
|
|
|
func removeNumber(runes []rune) []rune {
|
|
if len(runes) > 0 && runes[0] >= '0' && runes[0] <= '9' {
|
|
runes = runes[1:]
|
|
}
|
|
return runes
|
|
}
|
|
|
|
func removeColour(runes []rune) []rune {
|
|
if runes[0] != runecolour {
|
|
return runes
|
|
}
|
|
|
|
runes = runes[1:]
|
|
runes = removeNumber(runes)
|
|
runes = removeNumber(runes)
|
|
|
|
if len(runes) > 1 && runes[0] == ',' && runes[1] >= '0' && runes[1] <= '9' {
|
|
runes = runes[2:]
|
|
} else {
|
|
return runes // Nothing else because we dont have a comma
|
|
}
|
|
runes = removeNumber(runes)
|
|
return runes
|
|
}
|
|
|
|
// resolve "light blue" to "12", "12" to "12", "asdf" to "", etc.
|
|
func resolveToColourCode(str string) (result string) {
|
|
str = strings.ToLower(strings.TrimSpace(str))
|
|
if colourDigits.MatchString(str) {
|
|
return str
|
|
}
|
|
return colourcodesTruncated[str]
|
|
}
|
|
|
|
// resolve "[light blue, black]" to ("13, "1")
|
|
func resolveToColourCodes(namedColors string) (foreground, background string) {
|
|
// cut off the brackets
|
|
namedColors = strings.TrimPrefix(namedColors, "[")
|
|
namedColors = strings.TrimSuffix(namedColors, "]")
|
|
|
|
var foregroundStr, backgroundStr string
|
|
commaIdx := strings.IndexByte(namedColors, ',')
|
|
if commaIdx != -1 {
|
|
foregroundStr = namedColors[:commaIdx]
|
|
backgroundStr = namedColors[commaIdx+1:]
|
|
} else {
|
|
foregroundStr = namedColors
|
|
}
|
|
|
|
return resolveToColourCode(foregroundStr), resolveToColourCode(backgroundStr)
|
|
}
|
|
|
|
// Unescape takes our escaped string and returns a raw IRC string.
|
|
//
|
|
// IE, it turns this: "This is a $bcool$b, $c[red]red$r message!"
|
|
// into this: "This is a \x02cool\x02, \x034red\x0f message!"
|
|
func Unescape(in string) string {
|
|
var out strings.Builder
|
|
|
|
remaining := in
|
|
for len(remaining) != 0 {
|
|
char := remaining[0]
|
|
remaining = remaining[1:]
|
|
|
|
if char != '$' || len(remaining) == 0 {
|
|
// not an escape
|
|
out.WriteByte(char)
|
|
continue
|
|
}
|
|
|
|
// ingest the next character of the escape
|
|
char = remaining[0]
|
|
remaining = remaining[1:]
|
|
|
|
if char == 'c' {
|
|
out.WriteString(colour)
|
|
|
|
namedColors := bracketedExpr.FindString(remaining)
|
|
if namedColors == "" {
|
|
// for a non-bracketed color code, output the following characters directly,
|
|
// e.g., `$c1,8` will become `\x031,8`
|
|
continue
|
|
}
|
|
// process bracketed color codes:
|
|
remaining = remaining[len(namedColors):]
|
|
followedByDigit := len(remaining) != 0 && ('0' <= remaining[0] && remaining[0] <= '9')
|
|
|
|
foreground, background := resolveToColourCodes(namedColors)
|
|
if foreground != "" {
|
|
if len(foreground) == 1 && background == "" && followedByDigit {
|
|
out.WriteByte('0')
|
|
}
|
|
out.WriteString(foreground)
|
|
if background != "" {
|
|
out.WriteByte(',')
|
|
if len(background) == 1 && followedByDigit {
|
|
out.WriteByte('0')
|
|
}
|
|
out.WriteString(background)
|
|
}
|
|
}
|
|
} else {
|
|
val, exists := escapetoval[rune(char)]
|
|
if exists {
|
|
out.WriteString(val)
|
|
} else {
|
|
// invalid escape, use the raw char
|
|
out.WriteByte(char)
|
|
}
|
|
}
|
|
}
|
|
|
|
return out.String()
|
|
}
|