Block Macro Extension Example

lorem::sentences[size=2]

// NOTE: Below we are using a minimalist implementation to generate lorem ipsum text.
// If you need a complete implementation, you can use the following Node package:
// var lorem = require('lorem-ipsum')

var dictionary = {
  words: [
    'lorem',
    'ipsum',
    'dolor',
    'sit',
    'amet'
  ]
}

function getRandomArbitrary (min, max) {
  return Math.random() * (max - min) + min
}

function lorem (opts) {
  var count = opts.count
  var units = opts.units
  var words = dictionary.words
  if (units === 'sentences') {
    var sentences = []
    var sentence = []
    for (i = 0; i < count; i++) {
      var sentenceLength = getRandomArbitrary(5, 15)
      for (j = 0; j < sentenceLength; j++) {
        // use predictive position for testing purpose
        var position = j % words.length
        // var position = Math.floor(Math.random() * words.length)
        var word = dictionary.words[position]
        if (j === 0) {
          // capitalize the first letter
          word = word.charAt(0).toUpperCase() + word.slice(1)
        }
        sentence.push(word)
      }
      sentence[sentence.length - 1] += '.'
      sentences.push(sentence.join(' '))
    }
    return sentences.join(' ')
  }
}

module.exports = function (registry) {
  registry.blockMacro(function () {
    var self = this
    self.named('lorem')
    self.process(function (parent, target, attrs) {
      var size = parseInt(attrs.size)
      var result = lorem({ count: size, units: target })
      return self.createBlock(parent, 'paragraph', result)
    })
  })
}

const asciidoctor = require('asciidoctor')()
const registry = asciidoctor.Extensions.create()
require('./lorem-block-macro.js')(registry)

const html = asciidoctor.convert('lorem::sentences[size=2]', { 'extension_registry': registry })
console.log(html)
// <div class="paragraph">
// <p>Lorem ipsum dolor sit amet lorem ipsum dolor sit amet lorem ipsum dolor sit. Lorem ipsum dolor sit amet lorem ipsum dolor sit amet lorem ipsum dolor sit. Lorem ipsum dolor sit amet lorem ipsum dolor.</p>
// </div>