compromise/src/term/verb/conjugate/toActor.js

natural language processing in the browser

'use strict';
//turn 'walk' into 'walker'
const irregulars = {
  'tie': 'tier',
  'dream': 'dreamer',
  'sail': 'sailer',
  'run': 'runner',
  'rub': 'rubber',
  'begin': 'beginner',
  'win': 'winner',
  'claim': 'claimant',
  'deal': 'dealer',
  'spin': 'spinner'
};
const dont = {
  'aid': 1,
  'fail': 1,
  'appear': 1,
  'happen': 1,
  'seem': 1,
  'try': 1,
  'say': 1,
  'marry': 1,
  'be': 1,
  'forbid': 1,
  'understand': 1,
  'bet': 1
};
const rules = [{
  'reg': /e$/i,
  'repl': 'er'
}, {
  'reg': /([aeiou])([mlgp])$/i,
  'repl': '$1$2$2er'
}, {
  'reg': /([rlf])y$/i,
  'repl': '$1ier'
}, {
  'reg': /^(.?.[aeiou])t$/i,
  'repl': '$1tter'
}];

const toActor = function(inf) {
  //check blacklist
  if (dont[inf]) {
    return null
  }
  //check irregulars
  if (irregulars[inf]) {
    return irregulars[inf]
  }
  //try rules
  for (let i = 0; i < rules.length; i++) {
    if (inf.match(rules[i].reg)) {
      return inf.replace(rules[i].reg, rules[i].repl)
    }
  }
  //yup,
  return inf + 'er'
}

module.exports = toActor