foliant

Description

Generator of random synthetic words or names. Port from Go. Takes sample words, analyses them, and lazily produces a set of similar derived words. Works for any language.

Packaged in a format compatible with CommonJS / Node.js and AngularJS.

Contents

• Description
• Contents
• Installation
• Usage
• API Reference
  • Traits
    • Traits#examine
    • Traits#generator
• ToDo / WIP

Installation

CommonJS

In a shell:

npm i --save foliant
# or
npm i --save-dev foliant

In your program:

var Traits = require('foliant')

AngularJS

Assuming you have a bower-centric build system, in a shell:

bower i --save foliant
# or
bower i --save-dev foliant

In your program:

angular.module('MyGenerator', ['foliant'])
.factory('MyGenerator', ['Traits', function(Traits) {
  /* do things with Traits */
}])

foliant depends on lodash, so make sure you have window._ available. It's specified as a bower dependency, but not bundled. You might want to use main-bower-files to automatically read dependencies and organise their order.

Usage

// Examine source words and get their shared traits.
var traits = new Traits(['several', 'source', 'words'])
var gen = traits.generator()

// Print twelve random results.
for (var i = 0; i < 12; i++) {
  console.log(gen())
}

/*
woral
ordora
everdo
verdser
verand
andora
andoran
veral
sever
randser
seral
veran
*/

// Find out how many words may be derived from this sample.
var gen = traits.generator()
i = 0
while (gen()) i++
console.log(i)
// -> 213

Example with names:

// Examine source names and get their shared traits.
var traits = new Traits(['jasmine', 'katie', 'nariko', 'karen'])
var gen = traits.generator()

// Print twelve random results.
for (var i = 0; i < 12; i++) {
  console.log(gen())
}

/*
jarik
smiko
ikatik
arinat
nasmin
katie
rikatin
smikas
minena
ikatin
jasmika
rinaren
*/

// Find out how many names may be derived from this sample.
var gen = traits.generator()
i = 0
while (gen()) i++
console.log(i)
// -> 428

To run tests, clone the repo, cd to its directory, run npm i, and use:

npm test

To watch files and rerun tests while tinkering with the source, use:

npm run autotest

To run benchmarks:

node bench/index.bench.js

API Reference

Traits

The Traits class is the package's entry point.

// Transcript of the constructor, using ES5 syntax for accessibility.
function Traits(words) {
  // Minimum and maximum number of sounds.
  this.minNSounds = 0
  this.maxNSounds = 0
  // Minimum and maximum number of vowels.
  this.minNVowels = 0
  this.maxNVowels = 0
  // Maximum number of consequtive vowels.
  this.maxConseqVow = 0
  // Maximum number of consequtive consonants.
  this.maxConseqCons = 0
  // Set of sounds that occur in the words.
  this.soundSet = new StringSet()
  // Set of pairs of sounds that occur in the words.
  this.pairSet = new PairSet()

  // Replacement sound set to use instead of the default `knownSounds`.
  this.knownSounds = null
  // Replacement sound set to use instead of the default `knownVowels`.
  this.knownVowels = null

  if (words instanceof Array) this.examine(words)
}

Traits represent rudimental characteristics of a word or group of words. A traits object unequivocally defines a set of synthetic words that may be derived from it.

The constructor optionally takes existing words as input and examines them with Traits#examine(). The resulting characteristics are assigned to the newly created Traits object. Words must consist of known glyphs, as defined by the default sound sets or by custom sets assigned to a traits object (see below). If an invalid word is encountered, an error is thrown.

The optional fields knownSounds and knownVowels specify custom sets of sounds and vowels. This lets you use foliant with any character set, including non-Latin alphabets.

Traits#examine()

Analyses the given words and merges their characteristics into self.

var traits = new Traits()
traits.examine(['mountain', 'waterfall', 'grotto'])

By default, this uses the sets of known sounds and vowels defined in index.js. This includes the 26 letters of the standard US English alphabet and some common digraphs like th, which are treated as single phonemes.

However, foliant is language-independent. Assign custom knownSounds and knownVowels to teach it a sound system of your choosing. It can be Greek or Cyrillic or Elvish or Clingon — doesn't matter as long as the given sounds and vowels cover the words in your input. Refer to index.js as an example.

Here's how to teach it Greek:

var traits = new Traits()

traits.knownSounds = new Traits.StringSet([
  'α', 'β', 'γ', 'δ', 'ε', 'ζ', 'η', 'θ', 'ι', 'κ', 'λ', 'μ',
  'ν', 'ξ', 'ο', 'π', 'ρ', 'σ', 'ς', 'τ', 'υ', 'φ', 'χ', 'ψ', 'ω'
])

traits.knownVowels = new Traits.StringSet([
  'α', 'ε', 'η', 'ι', 'ο', 'υ', 'ω'
])

traits.examine(['ελ', 'διδασκω', 'ελληνικο', 'αλφαβητο'])

var gen = traits.generator()
for (var word = gen(); word != ''; word = gen()) {
  console.log(word)
}

// ιδαλφ
// κο
// ηνικο
// ...

Traits#generator()

Creates a generator function that yields a new random synthetic word on each call. The words are guaranteed to never repeat, and to be randomly distributed across the total set of possible words for these traits.

After a generator is exhausted, subsequent calls return ''.

A traits object is stateless, and generator() produces a completely new generator on each call. Generators don't affect each other.

Generators are lazy and individual calls are very fast, making foliant suitable for web clients and Node.js servers. See bench/index.bench.js.

var traits = new Traits(['goblin', 'smoke'])
var gen = traits.generator()

var words = [], word
while (word = gen()) words.push(word)

console.log(words.join(' '))

// oblin smobli smoke goblin gobli moblin mobli
// this generator is exhausted

ToDo / WIP

• Port more tests from the Go version, particularly the randomness test.
• In a large dataset, the last few words returned by a generator are too similar; random distribution needs improvement.
• Consider restricting repeated triples in Traits#validComplete().