Golang : Convert word to its plural form example

Here is a program that will convert a singular word into its plural form and at the same time, perform sanity check to see if the word is already pluralized and avoid pluralizing the given word. Although it has two maps to translate couple of special words from singular to plural and back to singular form...by all means the maps are not complete. Feel free to add in those missing words.

Can be useful in enhancing chat bot or simply just to follow the rule of grammar. For my own usage, I need this code to form proper sentence after a computer vision program calculated the number of detect objects.

NOTES: This program purposely avoid using regular expression.

Here you go!

 package main

 import (
  "fmt"
 )

 var vowels = []string{"a", "e", "i", "o", "u"}

 var pluralDictionary = map[string]string{
  "is": "are",
  "analysis": "analyses",
  "alumnus": "alumni",
  "alumnae": "alumni",
  "atlas": "atlases",
  "appendix": "appendices",
  "barrack": "barracks",
  "beef": "beefs",
  "brother": "brothers",
  "cafe": "cafes",
  "corpus": "corpuses",
  "cow": "cows",
  "ganglion": "ganglions",
  "genus": "genera",
  "graffito": "graffiti",
  "loaf": "loaves",
  "money": "monies",
  "mongoose": "mongooses",
  "move": "moves",
  "mythos": "mythoi",
  "niche": "niches",
  "numen": "numina",
  "octopus": "octopuses",
  "opus": "opuses",
  "ox": "oxen",
  "penis": "penises",
  "vagina": "vaginas",
  "sex": "sexes",
  "testis": "testes",
  "turf": "turfs",
  "tooth": "teeth",
  "foot": "feet",
  "cactus": "cacti",
  "child": "children",
  "criterion":  "criteria",
  "news": "news",
  "datum": "data",
  "deer": "deer",
  "echo": "echoes",
  "elf": "elves",
  "embargo": "embargoes",
  "foe": "foes",
  "focus": "foci",
  "fungus": "fungi",
  "goose": "geese",
  "hero": "heroes",
  "hoof": "hooves",
  "index": "indices",
  "knife": "knives",
  "leaf": "leaves",
  "life": "lives",
  "man": "men",
  "mouse": "mice",
  "nucleus": "nuclei",
  "person": "people",
  "phenomenon": "phenomena",
  "potato": "potatoes",
  "self": "selves",
  "syllabus": "syllabi",
  "tomato": "tomatoes",
  "torpedo": "torpedoes",
  "veto": "vetoes",
  "woman": "women",
  "zero": "zeroes",
 }

 var singularDictionary = map[string]string{
  "are": "is",
  "analyses": "analysis",
  "alumni": "alumnus",
  //"alumni": "alumnae", // for female - cannot have duplicate in map

  "genii": "genius",
  "data": "datum",
  "atlases": "atlas",
  "appendices": "appendix",
  "barracks": "barrack",
  "beefs": "beef",
  "brothers": "brother",
  "cafes": "cafe",
  "corpuses": "corpus",
  "cows": "cow",
  "ganglions":  "ganglion",
  "genera": "genus",
  "graffiti": "graffito",
  "loaves": "loaf",
  "monies": "money",
  "mongooses":  "mongoose",
  "moves": "move",
  "mythoi": "mythos",
  "niches": "niche",
  "numina": "numen",
  "octopuses":  "octopus",
  "opuses": "opus",
  "oxen": "ox",
  "penises": "penis",
  "vaginas": "vagina",
  "sexes": "sex",
  "testes": "testis",
  "turfs": "turf",
  "teeth": "tooth",
  "feet": "foot",
  "cacti": "cactus",
  "children": "child",
  "criteria": "criterion",
  "news": "news",
  "deer": "deer",
  "echoes": "echo",
  "elves": "elf",
  "embargoes":  "embargo",
  "foes": "foe",
  "foci": "focus",
  "fungi": "fungus",
  "geese": "goose",
  "heroes": "hero",
  "hooves": "hoof",
  "indices": "index",
  "knifes": "knife",
  "leaves": "leaf",
  "lives": "life",
  "men": "man",
  "mice": "mouse",
  "nuclei": "nucleus",
  "people": "person",
  "phenomena":  "phenomenon",
  "potatoes": "potato",
  "selves": "self",
  "syllabi": "syllabus",
  "tomatoes": "tomato",
  "torpedoes":  "torpedo",
  "vetoes": "veto",
  "women": "woman",
  "zeroes": "zero",
 }

 //https://www.socketloop.com/tutorials/golang-check-if-item-is-in-slice-array
 func inVowels(str string, list []string) bool {
  for _, v := range list {
 if v == str {
 return true
 }
  }
  return false
 }

 func AlreadyPluralized(test string) bool {
  if len(test) != 1 {

 // to handle words like genii, data and etc.
 if singularDictionary[test] != "" {

 return true
 }

 // put in some exceptions
 //if (string(test[len(test)-1]) != "s") || (string(test[len(test)-2]) != "ii") {
 if string(test[len(test)-1]) != "s" {

 if (string(test[len(test)-1:]) != "e") || (string(test[len(test)-1:]) != "y") {
 return false
 }

 if (string(test[len(test)-2:]) == "ch") || (string(test[len(test)-2:]) == "sh") || (string(test[len(test)-3:]) == "nes") {
 return false
 }

 if string(test[len(test)-3:]) == "ius" {
 return false
 }

 if pluralDictionary[test] == "" {
 return true
 }

 } else {
 return true
 }
  }
  return false

 }

 func Pluralize(singular string) string {

  plural := ""
  suffix := ""

  if singular != "" {

 root := singular

 // are we dealing with a single character?

 if len(singular) == 1 {
 return singular + "s"
 }

 plural = pluralDictionary[singular]

 // found an exact match in map
 if plural != "" {
 return plural
 //fmt.Println(plural)
 }

 // handle -sis
 if string(singular[len(singular)-3:]) == "sis" {
 root = string(singular[:len(singular)-3])
 suffix = "ses"
 plural = root + suffix
 return plural
 }

 // handle -z
 if string(singular[len(singular)-1:]) == "z" {
 root = string(singular[:len(singular)-1])
 suffix = "zes"
 plural = root + suffix
 return plural
 }

 // handle -ex
 if string(singular[len(singular)-2:]) == "ex" {
 root = string(singular[:len(singular)-2])
 suffix = "ices"
 plural = root + suffix
 return plural
 }

 // handle -ix
 if string(singular[len(singular)-2:]) == "ix" {
 root = string(singular[:len(singular)-2])
 suffix = "ices"
 plural = root + suffix
 return plural
 }

 // handle -us
 if string(singular[len(singular)-2:]) == "us" {
 root = string(singular[:len(singular)-2])
 suffix = "uses"
 plural = root + suffix
 return plural
 }

 // handle word such as dolly
 if (string(singular[len(singular)-1]) == "y") && !inVowels(string(singular[len(singular)-2]), vowels) {
 root = string(singular[:len(singular)-1])
 suffix = "ies"

 } else if string(singular[len(singular)-1]) == "s" {
 if inVowels(string(singular[len(singular)-2]), vowels) {
 if string(singular[len(singular)-3:]) == "ius" {
 root = string(singular[:len(singular)-2])
 suffix = "i"
 } else {
 root = string(singular[:len(singular)-1])
 suffix = "ses"
 }
 } else {
 suffix = "es"
 }
 } else if (string(singular[len(singular)-2:]) == "ch") || (string(singular[len(singular)-2:]) == "sh") {
 suffix = "es"
 } else {
 suffix = "s"
 }

 plural = root + suffix

 // sanity check
 if AlreadyPluralized(singular) {
 return singular
 } else {
 return plural
 }

  } else {
 return "Singular cannot be empty"
  }
 }

 func main() {
  fmt.Println("************************************")
  fmt.Println("*  convert singular to plural *")
  fmt.Println("************************************")
  // test empty string
  singular := ""
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "diagnosis"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "news"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "is"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "series"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "arm"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "status"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "dependency"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "goose"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "dolly"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "datum"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "genius"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "jones"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "tree"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "infantry"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "hero"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "zero"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "tons"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "tonus"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "temple"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "church"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "x"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "triangle"
  fmt.Println(singular + ":" + Pluralize(singular))

  singular = "colony"
  fmt.Println(singular + ":" + Pluralize(singular))

  fmt.Println("************************************")
  fmt.Println("*  sanity check tests on plurals *")
  fmt.Println("************************************")
  // what if already plural
  singular = "triangles"
  fmt.Println(singular+":", AlreadyPluralized(singular))

  singular = "shiites"
  fmt.Println(singular+":", AlreadyPluralized(singular))

  singular = "infantries"
  fmt.Println(singular+":", AlreadyPluralized(singular))

  singular = "torpedoes"
  fmt.Println(singular+":", AlreadyPluralized(singular))

  singular = "genii"
  fmt.Println(singular+":", AlreadyPluralized(singular))
  // retrieve the singular form
  fmt.Println(singular+" singular form is :", singularDictionary[singular])

  singular = "aces"
  fmt.Println(singular+":", AlreadyPluralized(singular))

  singular = "townies"
  fmt.Println(singular+":", AlreadyPluralized(singular))

  singular = "data"
  fmt.Println(singular+":", AlreadyPluralized(singular))
  // retrieve the singular form
  fmt.Println(singular+" singular form is :", singularDictionary[singular])

  singular = "joneses"
  fmt.Println(singular+":", AlreadyPluralized(singular))

 }

Sample output:

************************************

* convert singular to plural *

************************************

:Singular cannot be empty

tooth:teeth

foot:feet

head:heads

arm:arms

torpedo:torpedoes

dependency:dependencies

goose:geese

dolly:dollies

datum:data

genius:genius

jones:jones

tree:trees

infantry:infantries

hero:heroes

zero:zeroes

tons:tons

tonus:tonus

temple:temples

church:churches

x:xs

triangle:triangles

colony:colonies

************************************

* sanity check tests on plurals *

************************************

triangles: true

shiites: true

infantries: true

torpedoes: true

genii: true

genii singular form is : genius

aces: true

townies: true

data: true

data singular form is : datum

joneses: true

Happy coding!

References:

https://www.socketloop.com/tutorials/golang-check-if-item-is-in-slice-array

http://code.activestate.com/recipes/577781-pluralize-word-convert-singular-word-to-its-plural/