discourse/app/assets/javascripts/pretty-text/engines/markdown-it/newline.js.es6

54 lines
1.4 KiB
JavaScript

// 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) {
var token, pmax, max, 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
// convertion to flat mode.
if (!silent) {
if (pmax >= 0 && state.pending.charCodeAt(pmax) === 0x20) {
if (pmax >= 1 && state.pending.charCodeAt(pmax - 1) === 0x20) {
state.pending = state.pending.replace(/ +$/, '');
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);
});
}