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Singularize.swift
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Singularize.swift
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//
// Singularize.swift
// SwiftFormat
//
// Created by Nick Lockwood on 02/01/2024.
// Copyright 2024 Nick Lockwood
//
// Distributed under the permissive MIT license
// Get the latest version from here:
//
// https://github.com/nicklockwood/SwiftFormat
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
import Foundation
// Inspired by https://github.com/Cosmo/GrammaticalNumber
private let rules: [(String, replacement: String)] = [
("s$", ""),
("eaux$", "eau"),
("ae$", "a"),
("era$", "us"),
("(e)ae$", "$1us"),
("(ss)$", "$1"),
("(tt?)i$", "$1o"),
("([tivdl])a$", "$1um"),
("(i)ves$", "$1fe"),
("([alr]|oo|ie)ves$", "$1f"),
("([th]ive)s$", "$1"),
("([^aeiouy]|qu)ies$", "$1y"),
("(ov|mb)ies$", "$1ie"),
("(x|ch|ss|sh)es$", "$1"),
("([ml])ice$", "$1ouse"),
("(d)ice$", "$1ie"),
("(bus|ato)es$", "$1"),
("(cris|test)es$", "$1is"),
("^(pra|a)xes$", "$1xis"),
("([sz])es$", "$1"),
("(ace|ase)s$", "$1"),
("(ias)es$", "$1"),
("(z)zes$", "$1"),
("((ba|grou)se)s$", "$1"),
("(x)en", "$1"),
("(oa|ly|gno|op|the|ip)ses$", "$1sis"),
("(rt|ind|ap|cod)ices$", "$1ex"),
("(tr|end)ices$", "$1ix"),
("(oc|radi|vir|octop|alumn|cill|cact|fung|ul|ab)i$", "$1us"),
("(vir)ii$", "$1us"),
("(quiz)zes$", "$1"),
("(pe)ople$", "$1rson"),
("(m)en$", "$1an"),
("(child)ren$", "$1"),
("(t)eeth$", "$1ooth"),
("(g)eese$", "$1oose"),
("(iteri|en)a$", "$1on"),
// Uncountable
("(bison|craft|deer|equipment|fish|fruit|grouse|money|news|offspring)$", "$1"),
("(info(rmation)?|rice|salmon|series|sheep|shrimp|species|swine|trout|tuna)$", "$1"),
// It's very rare to actually want "datum" or "medium"
("(data|media)$", "$1"),
]
extension String {
func singularized() -> String? {
guard let (rule, replacement) = (rules.reversed().first { rule, _ in
range(of: rule, options: [.regularExpression, .caseInsensitive], range: nil, locale: nil) != nil
}) else {
return nil
}
return replacingOccurrences(of: rule, with: replacement, options: [.regularExpression, .caseInsensitive])
.removingPrefix("all")
}
func removingPrefix(_ prefix: String) -> String? {
if hasPrefix(prefix.lowercased()) {
let string = dropFirst(prefix.count)
return string.first.map { "\($0.lowercased())\(string.dropFirst())" }
}
if hasPrefix(prefix.capitalized) {
let string = dropFirst(prefix.count)
return string.first.map { "\($0.uppercased())\(string.dropFirst())" }
}
return self
}
}