Module: Philiprehberger::Pluralize::Rules

Defined in:

lib/philiprehberger/pluralize/rules.rb

Overview

Pluralization and singularization rules for English words

Constant Summary

PLURALS =

[
  [/$/, 's'],
  [/s$/i, 's'],
  [/^(ax|test)is$/i, '\1es'],
  [/(octop|vir)us$/i, '\1i'],
  [/(octop|vir)i$/i, '\1i'],
  [/(alias|status)$/i, '\1es'],
  [/(bu|mis|gas)s$/i, '\1ses'],
  [/(buffal|tomat)o$/i, '\1oes'],
  [/([ti])um$/i, '\1a'],
  [/([ti])a$/i, '\1a'],
  [/sis$/i, 'ses'],
  [/(?:([^f])fe|([lr])f)$/i, '\1\2ves'],
  [/(hive)$/i, '\1s'],
  [/([^aeiouy]|qu)y$/i, '\1ies'],
  [/(x|ch|ss|sh)$/i, '\1es'],
  [/(matr|vert|append)ix|ice$/i, '\1ices'],
  [/^(m|l)ouse$/i, '\1ice'],
  [/^(m|l)ice$/i, '\1ice'],
  [/^(ox)$/i, '\1en'],
  [/^(oxen)$/i, '\1'],
  [/(quiz)$/i, '\1zes'],
  [/([m|l])an$/i, '\1en'],
  [/([m|l])en$/i, '\1en'],
  [/^(pe)(rson|ople)$/i, '\1ople'],
  [/(child)(ren)?$/i, '\1ren'],
  [/^(g)(oose|eese)$/i, '\1eese'],
  [/^(t)(ooth|eeth)$/i, '\1eeth'],
  [/^(f)(oot|eet)$/i, '\1eet'],
  [/(phenomen|criteri)on$/i, '\1a'],
  [/(phenomen|criteri)a$/i, '\1a'],
  [/^(d)(atum|ata)$/i, '\1ata'],
  [/^(cact)(us|i)$/i, '\1i'],
  [/^(fung)(us|i)$/i, '\1i'],
  [/^(nucle)(us|i)$/i, '\1i'],
  [/^(syllab)(us|i)$/i, '\1i'],
  [/^(foc)(us|i)$/i, '\1i'],
  [/^(stimul)(us|i)$/i, '\1i'],
  [/^(alumn)(us|i)$/i, '\1i'],
  [/^(radi)(us|i)$/i, '\1i'],
  [/^(ind)(ex|ices)$/i, '\1ices'],
  [/^(vert)(ex|ices)$/i, '\1ices'],
  [/^(matr)(ix|ices)$/i, '\1ices'],
  [/(elf)$/i, 'elves'],
  [/(elves)$/i, 'elves'],
  [/(half)$/i, 'halves'],
  [/(halves)$/i, 'halves'],
  [/(leaf)$/i, 'leaves'],
  [/(leaves)$/i, 'leaves'],
  [/(loaf)$/i, 'loaves'],
  [/(loaves)$/i, 'loaves'],
  [/(thief)$/i, 'thieves'],
  [/(thieves)$/i, 'thieves'],
  [/(wolf)$/i, 'wolves'],
  [/(wolves)$/i, 'wolves'],
  [/(wife)$/i, 'wives'],
  [/(wives)$/i, 'wives'],
  [/(knife)$/i, 'knives'],
  [/(knives)$/i, 'knives'],
  [/(life)$/i, 'lives'],
  [/(lives)$/i, 'lives'],
  [/(dwarf)$/i, 'dwarves'],
  [/(dwarves)$/i, 'dwarves'],
  [/(scarf)$/i, 'scarves'],
  [/(scarves)$/i, 'scarves'],
  [/(hero)$/i, 'heroes'],
  [/(heroes)$/i, 'heroes'],
  [/(potato)$/i, 'potatoes'],
  [/(potatoes)$/i, 'potatoes'],
  [/(volcano)$/i, 'volcanoes'],
  [/(volcanoes)$/i, 'volcanoes'],
  [/(tornado)$/i, 'tornadoes'],
  [/(tornadoes)$/i, 'tornadoes'],
  [/(echo)$/i, 'echoes'],
  [/(echoes)$/i, 'echoes'],
  [/(embargo)$/i, 'embargoes'],
  [/(embargoes)$/i, 'embargoes'],
  [/(mosquito)$/i, 'mosquitoes'],
  [/(mosquitoes)$/i, 'mosquitoes']
].freeze

SINGULARS =

[
  [/s$/i, ''],
  [/(ss)$/i, '\1'],
  [/(news)$/i, '\1'],
  [/([ti])a$/i, '\1um'],
  [/((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)(ses|sis)$/i, '\1sis'],
  [/(^analy)(ses|sis)$/i, '\1sis'],
  [/([^f])ves$/i, '\1fe'],
  [/(hive)s$/i, '\1'],
  [/(tive)s$/i, '\1'],
  [/([lr])ves$/i, '\1f'],
  [/([^aeiouy]|qu)ies$/i, '\1y'],
  [/(s)eries$/i, '\1eries'],
  [/(m)ovies$/i, '\1ovie'],
  [/(x|ch|ss|sh)es$/i, '\1'],
  [/^(m|l)ice$/i, '\1ouse'],
  [/(bus)(es)?$/i, '\1'],
  [/(o)es$/i, '\1'],
  [/(shoe)s$/i, '\1'],
  [/(cris|test)(is|es)$/i, '\1is'],
  [/^(a)x[ie]s$/i, '\1xis'],
  [/(octop|vir)(us|i)$/i, '\1us'],
  [/(alias|status)(es)?$/i, '\1'],
  [/^(ox)en/i, '\1'],
  [/(vert|ind)ices$/i, '\1ex'],
  [/(matr)ices$/i, '\1ix'],
  [/(quiz)zes$/i, '\1'],
  [/(database)s$/i, '\1'],
  [/([m|l])en$/i, '\1an'],
  [/^(pe)(ople|rson)$/i, '\1rson'],
  [/(child)(ren)?$/i, '\1'],
  [/^(g)(eese|oose)$/i, '\1oose'],
  [/^(t)(eeth|ooth)$/i, '\1ooth'],
  [/^(f)(eet|oot)$/i, '\1oot'],
  [/(phenomen|criteri)a$/i, '\1on'],
  [/^(d)(ata|atum)$/i, '\1atum'],
  [/^(cact)(i|us)$/i, '\1us'],
  [/^(fung)(i|us)$/i, '\1us'],
  [/^(nucle)(i|us)$/i, '\1us'],
  [/^(syllab)(i|us)$/i, '\1us'],
  [/^(foc)(i|us)$/i, '\1us'],
  [/^(stimul)(i|us)$/i, '\1us'],
  [/^(alumn)(i|us)$/i, '\1us'],
  [/^(radi)(i|us)$/i, '\1us'],
  [/^(ind)(ices|ex)$/i, '\1ex'],
  [/^(vert)(ices|ex)$/i, '\1ex'],
  [/^(matr)(ices|ix)$/i, '\1ix'],
  [/(elves)$/i, 'elf'],
  [/(halves)$/i, 'half'],
  [/(leaves)$/i, 'leaf'],
  [/(loaves)$/i, 'loaf'],
  [/(thieves)$/i, 'thief'],
  [/(wolves)$/i, 'wolf'],
  [/(wives)$/i, 'wife'],
  [/(knives)$/i, 'knife'],
  [/(lives)$/i, 'life'],
  [/(dwarves)$/i, 'dwarf'],
  [/(scarves)$/i, 'scarf'],
  [/(heroes)$/i, 'hero'],
  [/(potatoes)$/i, 'potato'],
  [/(volcanoes)$/i, 'volcano'],
  [/(tornadoes)$/i, 'tornado'],
  [/(echoes)$/i, 'echo'],
  [/(embargoes)$/i, 'embargo'],
  [/(mosquitoes)$/i, 'mosquito']
].freeze

IRREGULARS =

{
  'person' => 'people',
  'man' => 'men',
  'woman' => 'women',
  'child' => 'children',
  'sex' => 'sexes',
  'move' => 'moves',
  'zombie' => 'zombies',
  'goose' => 'geese',
  'mouse' => 'mice',
  'tooth' => 'teeth',
  'foot' => 'feet',
  'ox' => 'oxen',
  'louse' => 'lice',
  'criterion' => 'criteria',
  'phenomenon' => 'phenomena',
  'datum' => 'data',
  'cactus' => 'cacti',
  'focus' => 'foci',
  'fungus' => 'fungi',
  'nucleus' => 'nuclei',
  'syllabus' => 'syllabi',
  'radius' => 'radii',
  'alumnus' => 'alumni',
  'stimulus' => 'stimuli',
  'octopus' => 'octopi',
  'virus' => 'viri',
  'index' => 'indices',
  'vertex' => 'vertices',
  'matrix' => 'matrices',
  'quiz' => 'quizzes'
}.freeze

UNCOUNTABLES =

Set.new(%w[
  equipment
  information
  rice
  money
  species
  series
  fish
  sheep
  jeans
  police
  deer
  moose
  offspring
  aircraft
  salmon
  trout
  swine
  bison
  buffalo
  elk
  shrimp
  plankton
  squid
  tuna
  cod
  means
  news
  mathematics
  physics
  economics
  ethics
  politics
  athletics
  linguistics
  gymnastics
  electronics
  aeronautics
  statistics
  semantics
  logistics
  diabetes
  herpes
  measles
  mumps
  rabies
  scissors
  pants
  shorts
  glasses
  tweezers
  pliers
  tongs
  headquarters
  barracks
  gallows
  crossroads
  innings
  chassis
  corps
  debris
  kudos
  molasses
  shambles
  premises
]).freeze