article.js

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abbreviations.js adjectives.js convertables.js dates.js demonyms.js firstnames.js honourifics.js irregular_nouns.js irregular_verbs.js misc.js multiples.js numbers.js organisations.js phrasal_verbs.js places.js uncountables.js verbs.js fns.js index.js lexicon.js negate.js passive_voice.js contractions.js fancy_lumping.js grammar_rules.js parts_of_speech.js phrasal_verbs.js tagger.js word_rules.js question.js sentence.js statement.js tense.js adjective.js to_adverb.js to_comparative.js to_noun.js to_superlative.js adverb.js to_adjective.js is_acronym.js article.js date.js date_rules.js is_date.js parse_date.js is_plural.js is_uncountable.js noun.js is_organisation.js organisation.js gender.js is_person.js parse_name.js person.js is_place.js place.js pluralize.js pronoun.js singularize.js is_value.js numbers.js to_number.js units.js value.js term.js conjugate.js from_infinitive.js predict_form.js suffix_rules.js to_actor.js to_infinitive.js negate.js verb.js sentence_parser.js text.js

article.js

'use strict';

const is_acronym = require('../is_acronym.js');

chooses an indefinite aricle ‘a/an’ for a word

const irregulars = {
  'hour': 'an',
  'heir': 'an',
  'heirloom': 'an',
  'honest': 'an',
  'honour': 'an',
  'honor': 'an',
  'uber': 'an' //german u
};

const indefinite_article = function(str) {
  if (!str) {
    return null;
  }

pronounced letters of acronyms that get a ‘an’

  const an_acronyms = {
    A: true,
    E: true,
    F: true,
    H: true,
    I: true,
    L: true,
    M: true,
    N: true,
    O: true,
    R: true,
    S: true,
    X: true
  };

‘a’ regexes

  const a_regexs = [
    /^onc?e/i, //'wu' sound of 'o'
    /^u[bcfhjkqrstn][aeiou]/i, // 'yu' sound for hard 'u'
    /^eul/i
  ];

begin business time ////////////////// explicit irregular forms

  if (irregulars.hasOwnProperty(str)) {
    return irregulars[str];
  }

spelled-out acronyms

  if (is_acronym(str) && an_acronyms.hasOwnProperty(str.substr(0, 1))) {
    return 'an';
  }

‘a’ regexes

  for (let i = 0; i < a_regexs.length; i++) {
    if (str.match(a_regexs[i])) {
      return 'a';
    }
  }

basic vowel-startings

  if (str.match(/^[aeiou]/i)) {
    return 'an';
  }
  return 'a';
};

module.exports = indefinite_article;

¶

console.log(indefinite_article(‘N.D.A’));