코드루덴스

• 자바스크립트(js) 자연어 처리 기초, 불규칙 명사 포함, 단수 복수 상호 변경. English Noun word singular plural Change each other

https://stackoverflow.com/questions/27194359/javascript-pluralize-an-english-string

// revert == true : 단수
String.prototype.plural = function (revert) {

    var plural = {
        '(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"
    };

    var singular = {
        '(quiz)zes$': "$1",
        '(matr)ices$': "$1ix",
        '(vert|ind)ices$': "$1ex",
        '^(ox)en$': "$1",
        '(alias)es$': "$1",
        '(octop|vir)i$': "$1us",
        '(cris|ax|test)es$': "$1is",
        '(shoe)s$': "$1",
        '(o)es$': "$1",
        '(bus)es$': "$1",
        '([m|l])ice$': "$1ouse",
        '(x|ch|ss|sh)es$': "$1",
        '(m)ovies$': "$1ovie",
        '(s)eries$': "$1eries",
        '([^aeiouy]|qu)ies$': "$1y",
        '([lr])ves$': "$1f",
        '(tive)s$': "$1",
        '(hive)s$': "$1",
        '(li|wi|kni)ves$': "$1fe",
        '(shea|loa|lea|thie)ves$': "$1f",
        '(^analy)ses$': "$1sis",
        '((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$': "$1$2sis",
        '([ti])a$': "$1um",
        '(n)ews$': "$1ews",
        '(h|bl)ouses$': "$1ouse",
        '(corpse)s$': "$1",
        '(us)es$': "$1",
        's$': ""
    };

    var irregular = {
        'move': 'moves',
        'foot': 'feet',
        'goose': 'geese',
        'sex': 'sexes',
        'child': 'children',
        'man': 'men',
        'tooth': 'teeth',
        'person': 'people'
    };

    var uncountable = [
        'sheep',
        'fish',
        'deer',
        'moose',
        'series',
        'species',
        'money',
        'rice',
        'information',
        'equipment'
    ];

    // save some time in the case that singular and plural are the same
    if (uncountable.indexOf(this.toLowerCase()) >= 0)
        return this;

    var pattern, replace, array;
    // check for irregular forms
    for (let word in irregular) {
        if (revert) {
            pattern = new RegExp(irregular[word] + '$', 'i');
            replace = word;
        } else {
            pattern = new RegExp(word + '$', 'i');
            replace = irregular[word];
        }
        if (pattern.test(this))
            return this.replace(pattern, replace);
    }

    if (revert) array = singular;
    else array = plural;

    // check for matches using regular expressions
    for (let reg in array) {
        pattern = new RegExp(reg, 'i');

        if (pattern.test(this))
            return this.replace(pattern, array[reg]);
    }

    return this;
}