31 lines
989 B
JavaScript
31 lines
989 B
JavaScript
'use strict';
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const irregularPlurals = require('irregular-plurals');
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module.exports = (word, plural, count) => {
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if (typeof plural === 'number') {
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count = plural;
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}
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if (irregularPlurals.has(word.toLowerCase())) {
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plural = irregularPlurals.get(word.toLowerCase());
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const firstLetter = word.charAt(0);
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const isFirstLetterUpperCase = firstLetter === firstLetter.toUpperCase();
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if (isFirstLetterUpperCase) {
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plural = firstLetter.toUpperCase() + plural.slice(1);
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}
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const isWholeWordUpperCase = word === word.toUpperCase();
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if (isWholeWordUpperCase) {
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plural = plural.toUpperCase();
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}
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} else if (typeof plural !== 'string') {
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plural = (word.replace(/(?:s|x|z|ch|sh)$/i, '$&e').replace(/([^aeiou])y$/i, '$1ie') + 's')
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.replace(/i?e?s$/i, match => {
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const isTailLowerCase = word.slice(-1) === word.slice(-1).toLowerCase();
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return isTailLowerCase ? match.toLowerCase() : match.toUpperCase();
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});
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}
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return Math.abs(count) === 1 ? word : plural;
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};
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