Mega Code Archive
Implementation of the Infelctor in Ruby that transforms words from singular to plural
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#region license
//Copyright 2008 Ritesh Rao
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//http://www.apache.org/licenses/LICENSE-2.0
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
#endregion
/*
* CREDIT - Originaly adapted from Inflector.Net (http://andrewpeters.net/inflectornet/)
*/
using System.Collections.Generic;
using System.Text.RegularExpressions;
namespace NCommon.Util
{
///<summary>
/// Implementation of the Infelctor in Ruby that transforms words from singular to plural,
/// class names to table names, modularized class names to ones without, and class names to foreign keys
///</summary>
public static class Inflector
{
#region fields
private static readonly List<Rule> _plurals = new List<Rule>();
private static readonly List<Rule> _singulars = new List<Rule>();
private static readonly List<string> _uncountables = new List<string>();
#endregion
#region ..ctor
/// <summary>
/// Class Constructor.
/// </summary>
static Inflector()
{
AddPlural("$", "s");
AddPlural("s$", "s");
AddPlural("(ax|test)is$", "$1es");
AddPlural("(octop|vir)us$", "$1i");
AddPlural("(alias|status)$", "$1es");
AddPlural("(bu)s$", "$1ses");
AddPlural("(buffal|tomat)o$", "$1oes");
AddPlural("([ti])um$", "$1a");
AddPlural("sis$", "ses");
AddPlural("(?:([^f])fe|([lr])f)$", "$1$2ves");
AddPlural("(hive)$", "$1s");
AddPlural("([^aeiouy]|qu)y$", "$1ies");
AddPlural("(x|ch|ss|sh)$", "$1es");
AddPlural("(matr|vert|ind)ix|ex$", "$1ices");
AddPlural("([m|l])ouse$", "$1ice");
AddPlural("^(ox)$", "$1en");
AddPlural("(quiz)$", "$1zes");
AddSingular("s$", "");
AddSingular("(n)ews$", "$1ews");
AddSingular("([ti])a$", "$1um");
AddSingular("((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$", "$1$2sis");
AddSingular("(^analy)ses$", "$1sis");
AddSingular("([^f])ves$", "$1fe");
AddSingular("(hive)s$", "$1");
AddSingular("(tive)s$", "$1");
AddSingular("([lr])ves$", "$1f");
AddSingular("([^aeiouy]|qu)ies$", "$1y");
AddSingular("(s)eries$", "$1eries");
AddSingular("(m)ovies$", "$1ovie");
AddSingular("(x|ch|ss|sh)es$", "$1");
AddSingular("([m|l])ice$", "$1ouse");
AddSingular("(bus)es$", "$1");
AddSingular("(o)es$", "$1");
AddSingular("(shoe)s$", "$1");
AddSingular("(cris|ax|test)es$", "$1is");
AddSingular("(octop|vir)i$", "$1us");
AddSingular("(alias|status)es$", "$1");
AddSingular("^(ox)en", "$1");
AddSingular("(vert|ind)ices$", "$1ex");
AddSingular("(matr)ices$", "$1ix");
AddSingular("(quiz)zes$", "$1");
AddIrregular("person", "people");
AddIrregular("man", "men");
AddIrregular("child", "children");
AddIrregular("sex", "sexes");
AddIrregular("move", "moves");
AddUncountable("equipment");
AddUncountable("information");
AddUncountable("rice");
AddUncountable("money");
AddUncountable("species");
AddUncountable("series");
AddUncountable("fish");
AddUncountable("sheep");
}
#endregion
#region private class Rule
private class Rule
{
private readonly Regex _regex;
private readonly string _replacement;
public Rule(string pattern, string replacement)
{
_regex = new Regex(pattern, RegexOptions.IgnoreCase);
_replacement = replacement;
}
public string Apply(string word)
{
if (!_regex.IsMatch(word))
{
return null;
}
return _regex.Replace(word, _replacement);
}
}
#endregion
#region private rule buolder methods
private static void AddIrregular(string singular, string plural)
{
AddPlural("(" + singular[0] + ")" + singular.Substring(1) + "$", "$1" + plural.Substring(1));
AddSingular("(" + plural[0] + ")" + plural.Substring(1) + "$", "$1" + singular.Substring(1));
}
private static void AddUncountable(string word)
{
_uncountables.Add(word.ToLower());
}
private static void AddPlural(string rule, string replacement)
{
_plurals.Add(new Rule(rule, replacement));
}
private static void AddSingular(string rule, string replacement)
{
_singulars.Add(new Rule(rule, replacement));
}
private static string ApplyRules(List<Rule> rules, string word)
{
string result = word;
if (!_uncountables.Contains(word.ToLower()))
{
for (int i = rules.Count - 1; i >= 0; i--)
{
if ((result = rules[i].Apply(word)) != null)
{
break;
}
}
}
return result;
}
#endregion
#region methods
/// <summary>
/// Returns the plural form of the word in the string
/// </summary>
/// <param name="word">string. The word to pluralize.</param>
/// <returns>The pluralized word.</returns>
public static string Pluralize(string word)
{
return ApplyRules(_plurals, word);
}
/// <summary>
/// The reverse of <see cref="Pluralize"/>, returns the singular form of a word in a string.
/// </summary>
/// <param name="word">string. The word to singularize.</param>
/// <returns>The singluralized word.</returns>
public static string Singularize(string word)
{
return ApplyRules(_singulars, word);
}
/// <summary>
/// Capitalizes all the words and replaces some characters in the string to create a nicer looking title.
/// </summary>
/// <param name="word">string. The word to titleize.</param>
/// <returns>The titlized word.</returns>
public static string Titleize(string word)
{
return Regex.Replace(Humanize(Underscore(word)), @"\b([a-z])",
delegate(Match match)
{
return match.Captures[0].Value.ToUpper();
});
}
/// <summary>
/// Capitalizes the first word and turns underscores into spaces and strips _id. Formats the word into
/// human readable string.
/// </summary>
/// <param name="lowercaseAndUnderscoredWord">string. The word to humaize</param>
/// <returns>The humanized word.</returns>
public static string Humanize(string lowercaseAndUnderscoredWord)
{
return Capitalize(Regex.Replace(lowercaseAndUnderscoredWord, @"_", " "));
}
/// <summary>
/// Formats the string in pascal case.
/// </summary>
/// <param name="lowercaseAndUnderscoredWord">string. The word to Pascal case.</param>
/// <returns>The word in Pascal case.</returns>
public static string Pascalize(string lowercaseAndUnderscoredWord)
{
return Regex.Replace(lowercaseAndUnderscoredWord, "(?:^|_)(.)",
delegate(Match match)
{
return match.Groups[1].Value.ToUpper();
});
}
/// <summary>
/// Formats the string in Camel case.
/// </summary>
/// <param name="lowercaseAndUnderscoredWord">string. The word to format in Camel case.</param>
/// <returns>string. The word in Camel case.</returns>
public static string Camelize(string lowercaseAndUnderscoredWord)
{
return Uncapitalize(Pascalize(lowercaseAndUnderscoredWord));
}
/// <summary>
/// Makes an underscored form from the expression in the string.
/// </summary>
/// <param name="pascalCasedWord">string. The word to underscore.</param>
/// <returns>string. The word with underscore seperators.</returns>
public static string Underscore(string pascalCasedWord)
{
return Regex.Replace(
Regex.Replace(
Regex.Replace(pascalCasedWord, @"([A-Z]+)([A-Z][a-z])", "$1_$2"), @"([a-z\d])([A-Z])",
"$1_$2"), @"[-\s]", "_").ToLower();
}
/// <summary>
/// Capitalizes the word.
/// </summary>
/// <param name="word">string. The word to capitalize.</param>
/// <returns>The Capitalized word.</returns>
public static string Capitalize(string word)
{
return word.Substring(0, 1).ToUpper() + word.Substring(1).ToLower();
}
/// <summary>
/// Revers of <see cref="Capitalize"/>
/// </summary>
/// <param name="word">string. The word to un-capitalize.</param>
/// <returns></returns>
public static string Uncapitalize(string word)
{
return word.Substring(0, 1).ToLower() + word.Substring(1);
}
/// <summary>
/// Ordinalize turns a number into an ordinal string used to denote the position in an ordered
/// sequence such as 1st, 2nd, 3rd, 4th
/// </summary>
/// <param name="number">string. The number to ordinalize.</param>
/// <returns>string. The ordinalized number.</returns>
public static string Ordinalize(string number)
{
int n = int.Parse(number);
int nMod100 = n % 100;
if (nMod100 >= 11 && nMod100 <= 13)
{
return number + "th";
}
switch (n % 10)
{
case 1:
return number + "st";
case 2:
return number + "nd";
case 3:
return number + "rd";
default:
return number + "th";
}
}
/// <summary>
/// Replaces underscores with dashes in the string.
/// </summary>
/// <param name="underscoredWord">string. The word to dasherize.</param>
/// <returns>The word with dashes instead of underscores.</returns>
public static string Dasherize(string underscoredWord)
{
return underscoredWord.Replace('_', '-');
}
#endregion
}
}
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