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

Wiki markup transformer for JIRA and Confluence

import { parseString } from '../text';
import { TokenType } from './';
// h1. HEADING
// Ignored via go/ees005
// eslint-disable-next-line require-unicode-regexp
const HEADING_REGEXP = /^h([1-6])\.(.*)/;
export const heading = ({
  input,
  position,
  schema,
  context
}) => {
  /**
   * The following token types will be ignored in parsing
   * the content of a strong mark
   */
  const ignoreTokenTypes = [TokenType.DOUBLE_DASH_SYMBOL, TokenType.TRIPLE_DASH_SYMBOL, TokenType.QUADRUPLE_DASH_SYMBOL];
  const match = input.substring(position).match(HEADING_REGEXP);
  if (!match) {
    return fallback(input, position);
  }
  const level = parseInt(match[1], 10);
  const content = parseString({
    schema,
    ignoreTokenTypes,
    context,
    input: match[2]
  });
  try {
    const headingNode = schema.nodes.heading.createChecked({
      level
    }, content);
    return {
      type: 'pmnode',
      nodes: [headingNode],
      length: match[0].length
    };
  } catch (err) {
    /**
     * If the heading fails to rendering, we want to skip the text
     * "h1."
     */
    return {
      type: 'text',
      text: '',
      length: 4
    };
  }
};
function fallback(input, position) {
  return {
    type: 'text',
    text: input.substr(position, 1),
    length: 1
  };
}