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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Inflector;
/**
* Converts words between singular and plural forms.
*
* @author Bernhard Schussek <bschussek@gmail.com>
*
* @internal
*/
final class Inflector
{
/**
* Map English plural to singular suffixes.
*
* @var array
*
* @see http://english-zone.com/spelling/plurals.html
*/
private static $pluralMap = [
// First entry: plural suffix, reversed
// Second entry: length of plural suffix
// Third entry: Whether the suffix may succeed a vocal
// Fourth entry: Whether the suffix may succeed a consonant
// Fifth entry: singular suffix, normal
// bacteria (bacterium), criteria (criterion), phenomena (phenomenon)
['a', 1, true, true, ['on', 'um']],
// nebulae (nebula)
['ea', 2, true, true, 'a'],
// services (service)
['secivres', 8, true, true, 'service'],
// mice (mouse), lice (louse)
['eci', 3, false, true, 'ouse'],
// geese (goose)
['esee', 4, false, true, 'oose'],
// fungi (fungus), alumni (alumnus), syllabi (syllabus), radii (radius)
['i', 1, true, true, 'us'],
// men (man), women (woman)
['nem', 3, true, true, 'man'],
// children (child)
['nerdlihc', 8, true, true, 'child'],
// oxen (ox)
['nexo', 4, false, false, 'ox'],
// indices (index), appendices (appendix), prices (price)
['seci', 4, false, true, ['ex', 'ix', 'ice']],
// selfies (selfie)
['seifles', 7, true, true, 'selfie'],
// movies (movie)
['seivom', 6, true, true, 'movie'],
// feet (foot)
['teef', 4, true, true, 'foot'],
// geese (goose)
['eseeg', 5, true, true, 'goose'],
// teeth (tooth)
['hteet', 5, true, true, 'tooth'],
// news (news)
['swen', 4, true, true, 'news'],
// series (series)
['seires', 6, true, true, 'series'],
// babies (baby)
['sei', 3, false, true, 'y'],
// accesses (access), addresses (address), kisses (kiss)
['sess', 4, true, false, 'ss'],
// analyses (analysis), ellipses (ellipsis), funguses (fungus),
// neuroses (neurosis), theses (thesis), emphases (emphasis),
// oases (oasis), crises (crisis), houses (house), bases (base),
// atlases (atlas)
['ses', 3, true, true, ['s', 'se', 'sis']],
// objectives (objective), alternative (alternatives)
['sevit', 5, true, true, 'tive'],
// drives (drive)
['sevird', 6, false, true, 'drive'],
// lives (life), wives (wife)
['sevi', 4, false, true, 'ife'],
// moves (move)
['sevom', 5, true, true, 'move'],
// hooves (hoof), dwarves (dwarf), elves (elf), leaves (leaf), caves (cave), staves (staff)
['sev', 3, true, true, ['f', 've', 'ff']],
// axes (axis), axes (ax), axes (axe)
['sexa', 4, false, false, ['ax', 'axe', 'axis']],
// indexes (index), matrixes (matrix)
['sex', 3, true, false, 'x'],
// quizzes (quiz)
['sezz', 4, true, false, 'z'],
// bureaus (bureau)
['suae', 4, false, true, 'eau'],
// fees (fee), trees (tree), employees (employee)
['see', 3, true, true, 'ee'],
// roses (rose), garages (garage), cassettes (cassette),
// waltzes (waltz), heroes (hero), bushes (bush), arches (arch),
// shoes (shoe)
['se', 2, true, true, ['', 'e']],
// tags (tag)
['s', 1, true, true, ''],
// chateaux (chateau)
['xuae', 4, false, true, 'eau'],
// people (person)
['elpoep', 6, true, true, 'person'],
];
/**
* This class should not be instantiated.
*/
private function __construct()
{
}
/**
* Returns the singular form of a word.
*
* If the method can't determine the form with certainty, an array of the
* possible singulars is returned.
*
* @param string $plural A word in plural form
*
* @return string|array The singular form or an array of possible singular
* forms
*
* @internal
*/
public static function singularize($plural)
{
$pluralRev = strrev($plural);
$lowerPluralRev = strtolower($pluralRev);
$pluralLength = \strlen($lowerPluralRev);
// The outer loop iterates over the entries of the plural table
// The inner loop $j iterates over the characters of the plural suffix
// in the plural table to compare them with the characters of the actual
// given plural suffix
foreach (self::$pluralMap as $map) {
$suffix = $map[0];
$suffixLength = $map[1];
$j = 0;
// Compare characters in the plural table and of the suffix of the
// given plural one by one
while ($suffix[$j] === $lowerPluralRev[$j]) {
// Let $j point to the next character
++$j;
// Successfully compared the last character
// Add an entry with the singular suffix to the singular array
if ($j === $suffixLength) {
// Is there any character preceding the suffix in the plural string?
if ($j < $pluralLength) {
$nextIsVocal = false !== strpos('aeiou', $lowerPluralRev[$j]);
if (!$map[2] && $nextIsVocal) {
// suffix may not succeed a vocal but next char is one
break;
}
if (!$map[3] && !$nextIsVocal) {
// suffix may not succeed a consonant but next char is one
break;
}
}
$newBase = substr($plural, 0, $pluralLength - $suffixLength);
$newSuffix = $map[4];
// Check whether the first character in the plural suffix
// is uppercased. If yes, uppercase the first character in
// the singular suffix too
$firstUpper = ctype_upper($pluralRev[$j - 1]);
if (\is_array($newSuffix)) {
$singulars = [];
foreach ($newSuffix as $newSuffixEntry) {
$singulars[] = $newBase.($firstUpper ? ucfirst($newSuffixEntry) : $newSuffixEntry);
}
return $singulars;
}
return $newBase.($firstUpper ? ucfirst($newSuffix) : $newSuffix);
}
// Suffix is longer than word
if ($j === $pluralLength) {
break;
}
}
}
// Assume that plural and singular is identical
return $plural;
}
}
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