discourse/app/assets/javascripts/pretty-text/engines/discourse-markdown/newline.js

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// see: https://github.com/markdown-it/markdown-it/issues/375
//
// we use a custom paragraph rule cause we have to signal when a
// link starts with a space, so we can bypass a onebox
// this is a freedom patch, so careful, may break on updates
function newline(state, silent) {
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let token,
pmax,
max,
ws,
pos = state.pos;
if (state.src.charCodeAt(pos) !== 0x0a /* \n */) {
return false;
}
pmax = state.pending.length - 1;
max = state.posMax;
// ' \n' -> hardbreak
// Lookup in pending chars is bad practice! Don't copy to other rules!
// Pending string is stored in concat mode, indexed lookups will cause
// conversion to flat mode.
if (!silent) {
if (pmax >= 0 && state.pending.charCodeAt(pmax) === 0x20) {
if (pmax >= 1 && state.pending.charCodeAt(pmax - 1) === 0x20) {
// Find whitespaces tail of pending chars.
ws = pmax - 1;
while (ws >= 1 && state.pending.charCodeAt(ws - 1) === 0x20) {
ws--;
}
state.pending = state.pending.slice(0, ws);
token = state.push("hardbreak", "br", 0);
} else {
state.pending = state.pending.slice(0, -1);
token = state.push("softbreak", "br", 0);
}
} else {
token = state.push("softbreak", "br", 0);
}
}
pos++;
// skip heading spaces for next line
while (pos < max && state.md.utils.isSpace(state.src.charCodeAt(pos))) {
if (token) {
token.leading_space = true;
}
pos++;
}
state.pos = pos;
return true;
}
export function setup(helper) {
helper.registerPlugin((md) => {
md.inline.ruler.at("newline", newline);
});
}