discourse/plugins/chat/assets/javascripts/lib/discourse-markdown/chat-html-inline.js

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// inspired from https://github.com/markdown-it/markdown-it/blob/master/lib/rules_inline/html_inline.mjs
// note that allow lister will run on top of it, so if a tag is allowed here but not on
// the allow list, then it won't show up
const inline_names = ["kbd", "mark"];
const patterns = inline_names.join("|");
const attr_name = "[a-zA-Z_:][a-zA-Z0-9:._-]*";
const unquoted = "[^\"'=<>`\\x00-\\x20]+";
const single_quoted = "'[^']*'";
const double_quoted = '"[^"]*"';
const attr_value =
"(?:" + unquoted + "|" + single_quoted + "|" + double_quoted + ")";
const attribute = "(?:\\s+" + attr_name + "(?:\\s*=\\s*" + attr_value + ")?)";
const open_tag = `<(${patterns})` + attribute + "*\\s*\\/?>";
const close_tag = `<\\/(${patterns})\\s*>`;
const comment = "<!---?>|<!--(?:[^-]|-[^-]|--[^>])*-->";
const processing = "<[?][\\s\\S]*?[?]>";
const declaration = "<![A-Za-z][^>]*>";
const cdata = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>";
const HTML_TAG_RE = new RegExp(
"^(?:" +
open_tag +
"|" +
close_tag +
"|" +
comment +
"|" +
processing +
"|" +
declaration +
"|" +
cdata +
")"
);
function isLinkOpen(str) {
return /^<a[>\s]/i.test(str);
}
function isLinkClose(str) {
return /^<\/a\s*>/i.test(str);
}
function isLetter(ch) {
/*eslint no-bitwise:0*/
let lc = ch | 0x20; // to lower case
return lc >= 0x61 /* a */ && lc <= 0x7a /* z */;
}
function chatHtmlInlineRule(state, silent) {
let ch,
match,
max,
token,
pos = state.pos;
if (!state.md.options.html) {
return false;
}
// Check start
max = state.posMax;
if (state.src.charCodeAt(pos) !== 0x3c /* < */ || pos + 2 >= max) {
return false;
}
// Quick fail on second char
ch = state.src.charCodeAt(pos + 1);
if (
ch !== 0x21 /* ! */ &&
ch !== 0x3f /* ? */ &&
ch !== 0x2f /* / */ &&
!isLetter(ch)
) {
return false;
}
match = state.src.slice(pos).match(HTML_TAG_RE);
if (!match) {
return false;
}
if (!silent) {
token = state.push("html_inline", "", 0);
token.content = match[0];
if (isLinkOpen(token.content)) {
state.linkLevel++;
}
if (isLinkClose(token.content)) {
state.linkLevel--;
}
}
state.pos += match[0].length;
return true;
}
export function setup(helper) {
helper.registerPlugin((md) => {
if (md.options.discourse.features["chat-html-inline"]) {
md.inline.ruler.push("chat-html-inline", chatHtmlInlineRule);
}
});
}