wtf_wikipedia/src/02-section/heading.js

parse wikiscript into json

const { trim_whitespace } = require('../_lib/helpers')
const parseSentence = require('../04-sentence/').fromText
const parseReferences = require('../reference/')
const heading_reg = /^(={1,5})(.{1,200}?)={1,5}$/


/**
 * @typedef fakeSection
 * @property {string} title
 * @property {null | number} depth
 * @property {string} wiki
 */

/**
 * estimates the depth of a section and parses the title to a normal format
 *
 * @private
 * @param {fakeSection} section
 * @param {string} str
 * @returns {fakeSection} section the depth in a object
 */
const parseHeading = function (section, str) {
  let m = str.match(heading_reg)
  if (!m) {
    section.title = ''
    section.depth = 0
    return section
  }
  let title = m[2] || ''
  title = parseSentence(title).text()

  //amazingly, you can see inline {{templates}} in this text, too
  //... let's not think about that now.
  title = title.replace(/\{\{.+?\}\}/, '')

  //same for references (i know..)
  let obj = { _wiki: title }
  parseReferences(obj)
  title = obj._wiki

  //trim leading/trailing whitespace
  title = trim_whitespace(title)
  let depth = 0
  if (m[1]) {
    depth = m[1].length - 2
  }

  section.title = title
  section.depth = depth
  return section
}

module.exports = parseHeading