@atlaskit/editor-wikimarkup-transformer/dist/es2019/parser/tokenize/ruler.js

Wiki markup transformer for JIRA and Confluence

import { createRuleNode } from '../nodes/rule';
// Ignored via go/ees005
// eslint-disable-next-line require-unicode-regexp
const RULER_REGEX = /^-{4,5}(\s|$)/;
export const ruler = ({
  input,
  position,
  schema
}) => {
  const match = input.substring(position).match(RULER_REGEX);
  if (match) {
    return {
      type: 'pmnode',
      nodes: createRuleNode(schema),
      length: match[0].length
    };
  }
  return {
    type: 'text',
    text: input.substring(position, 1),
    length: 1
  };
};