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// See https://modern.ircdocs.horse/formatting.html
const BOLD = "\x02";
const ITALIC = "\x1D";
const UNDERLINE = "\x1F";
const STRIKETHROUGH = "\x1E";
const MONOSPACE = "\x11";
const COLOR = "\x03";
const COLOR_HEX = "\x04";
const REVERSE_COLOR = "\x16";
const RESET = "\x0F";
const HEX_COLOR_LENGTH = 6;
function isDigit(ch) {
return ch >= "0" && ch <= "9";
}
function isHexColor(text) {
if (text.length < HEX_COLOR_LENGTH) {
return false;
}
for (let i = 0; i < HEX_COLOR_LENGTH; i++) {
let ch = text[i].toUpperCase();
let ok = (ch >= "0" && ch <= "9") || (ch >= "A" && ch <= "F");
if (!ok) {
return false;
}
}
return true;
}
export function strip(text) {
let out = "";
for (let i = 0; i < text.length; i++) {
let ch = text[i];
switch (ch) {
case BOLD:
case ITALIC:
case UNDERLINE:
case STRIKETHROUGH:
case MONOSPACE:
case REVERSE_COLOR:
case RESET:
break; // skip
case COLOR:
if (!isDigit(text[i + 1])) {
break;
}
i++;
if (isDigit(text[i + 1])) {
i++;
}
if (text[i + 1] == "," && isDigit(text[i + 2])) {
i += 2;
if (isDigit(text[i + 1])) {
i++;
}
}
break;
case COLOR_HEX:
if (!isHexColor(text.slice(i + 1))) {
break;
}
i += HEX_COLOR_LENGTH;
if (text[i + 1] == "," && isHexColor(text.slice(i + 2))) {
i += 1 + HEX_COLOR_LENGTH;
}
break;
default:
out += ch;
}
}
return out;
}
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