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* **pluralize**s words of the English language.
*
* @param singular - An English word in `singular` form.
* @returns The **pluralize**d form of `singular`.
*
* @example
* **Pluralize** `'money'`:
* ```ts
* import { pluralize } from '@sgrud/core';
*
* pluralize('money'); // 'money'
* ```
*
* @example
* **Pluralize** `'thesis'`:
* ```ts
* import { pluralize } from '@sgrud/core';
*
* pluralize('thesis'); // 'theses'
* ```
*/
export function pluralize(singular: string): string {
if (!uncountables.includes(singular.toLowerCase())) {
for (const word in irregulars) {
const pattern = new RegExp(`${word}$`, 'i');
if (pattern.test(singular)) {
return singular.replace(pattern, irregulars[word]);
}
}
for (const regex in regulars) {
const pattern = new RegExp(regex, 'i');
if (pattern.test(singular)) {
return singular.replace(pattern, regulars[regex]);
}
}
}
return singular;
}
/**
* Regex mapping of singular words to their regular plural forms.
*/
const regulars = {
'(quiz)$' : '$1zes',
'^(ox)$' : '$1en',
'([m|l])ouse$' : '$1ice',
'(matr|vert|ind)ix|ex$' : '$1ices',
'(x|ch|ss|sh)$' : '$1es',
'([^aeiouy]|qu)y$' : '$1ies',
'(hive)$' : '$1s',
'(?:([^f])fe|([lr])f)$' : '$1$2ves',
'(shea|lea|loa|thie)f$' : '$1ves',
'sis$' : 'ses',
'([ti])um$' : '$1a',
'(tomat|potat|ech|her|vet)o$': '$1oes',
'(bu)s$' : '$1ses',
'(alias)$' : '$1es',
'(octop)us$' : '$1i',
'(ax|test)is$' : '$1es',
'(us)$' : '$1es',
'([^s]+)$' : '$1s'
} as Record<string, string>;
/**
* Mapping of singular words to their irregular plural forms.
*/
const irregulars = {
child : 'children',
foot : 'feet',
goose : 'geese',
man : 'men',
move : 'moves',
person: 'people',
sex : 'sexes',
tooth : 'teeth'
} as Record<string, string>;
/**
* List of uncountable singular words.
*/
const uncountables = [
'aircraft',
'bison',
'cod',
'deer',
'equipment',
'fish',
'hovercraft',
'information',
'money',
'moose',
'offspring',
'pike',
'rice',
'salmon',
'series',
'sheep',
'shrimp',
'spacecraft',
'species',
'sugar',
'swine',
'trout',
'tuna',
'wood',
'you'
];
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