Implementing Model-View-Presenter in ASP.NET

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text.RegularExpressions;
using SubSonic.Utilities;

namespace SubSonic
{
    public static class Inflector
    {
        private static readonly List<InflectorRule> _plurals = new List<InflectorRule>();
        private static readonly List<InflectorRule> _singulars = new List<InflectorRule>();
        private static readonly List<string> _uncountables = new List<string>();
        
        static Inflector()
        {
            AddPluralRule("$", "s");
            AddPluralRule("s$", "s");
            AddPluralRule("(ax|test)is$", "$1es");
            AddPluralRule("(octop|vir)us$", "$1i");
            AddPluralRule("(alias|status)$", "$1es");
            AddPluralRule("(bu)s$", "$1ses");
            AddPluralRule("(buffal|tomat)o$", "$1oes");
            AddPluralRule("([ti])um$", "$1a");
            AddPluralRule("sis$", "ses");
            AddPluralRule("(?:([^f])fe|([lr])f)$", "$1$2ves");
            AddPluralRule("(hive)$", "$1s");
            AddPluralRule("([^aeiouy]|qu)y$", "$1ies");
            AddPluralRule("(x|ch|ss|sh)$", "$1es");
            AddPluralRule("(matr|vert|ind)ix|ex$", "$1ices");
            AddPluralRule("([m|l])ouse$", "$1ice");
            AddPluralRule("^(ox)$", "$1en");
            AddPluralRule("(quiz)$", "$1zes");

            AddSingularRule("s$", "");
            AddSingularRule("ss$", "ss");
            AddSingularRule("(n)ews$", "$1ews");
            AddSingularRule("([ti])a$", "$1um");
            AddSingularRule("((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$", "$1$2sis");
            AddSingularRule("(^analy)ses$", "$1sis");
            AddSingularRule("([^f])ves$", "$1fe");
            AddSingularRule("(hive)s$", "$1");
            AddSingularRule("(tive)s$", "$1");
            AddSingularRule("([lr])ves$", "$1f");
            AddSingularRule("([^aeiouy]|qu)ies$", "$1y");
            AddSingularRule("(s)eries$", "$1eries");
            AddSingularRule("(m)ovies$", "$1ovie");
            AddSingularRule("(x|ch|ss|sh)es$", "$1");
            AddSingularRule("([m|l])ice$", "$1ouse");
            AddSingularRule("(bus)es$", "$1");
            AddSingularRule("(o)es$", "$1");
            AddSingularRule("(shoe)s$", "$1");
            AddSingularRule("(cris|ax|test)es$", "$1is");
            AddSingularRule("(octop|vir)i$", "$1us");
            AddSingularRule("(alias|status)$", "$1");
            AddSingularRule("(alias|status)es$", "$1");
            AddSingularRule("^(ox)en", "$1");
            AddSingularRule("(vert|ind)ices$", "$1ex");
            AddSingularRule("(matr)ices$", "$1ix");
            AddSingularRule("(quiz)zes$", "$1");

            AddIrregularRule("person", "people");
            AddIrregularRule("man", "men");
            AddIrregularRule("child", "children");
            AddIrregularRule("sex", "sexes");
            AddIrregularRule("tax", "taxes");
            AddIrregularRule("move", "moves");

            AddUnknownCountRule("equipment");
            AddUnknownCountRule("information");
            AddUnknownCountRule("rice");
            AddUnknownCountRule("money");
            AddUnknownCountRule("species");
            AddUnknownCountRule("series");
            AddUnknownCountRule("fish");
            AddUnknownCountRule("sheep");
        }

        private class InflectorRule
        {
            public readonly Regex regex;
            public readonly string replacement;

            public InflectorRule(string regexPattern, string replacementText)
            {
                regex = new Regex(regexPattern, RegexOptions.IgnoreCase);
                replacement = replacementText;
            }

            public string Apply(string word)
            {
                if (!regex.IsMatch(word))
                {
                    return null;   
                }
                
                string replace = regex.Replace(word, replacement);
                if(word == word.ToUpper())
                {
                    replace = replace.ToUpper();
                }
                return replace;
            }
        }

        private static void AddIrregularRule(string singular, string plural)
        {
            AddPluralRule("(" + singular[0] + ")" + singular.Substring(1) + "$", "$1" + plural.Substring(1));
            AddSingularRule("(" + plural[0] + ")" + plural.Substring(1) + "$", "$1" + singular.Substring(1));
        }

        private static void AddUnknownCountRule(string word)
        {
            _uncountables.Add(word.ToLower());
        }

        private static void AddPluralRule(string rule, string replacement)
        {
            _plurals.Add(new InflectorRule(rule, replacement));
        }

        private static void AddSingularRule(string rule, string replacement)
        {
            _singulars.Add(new InflectorRule(rule, replacement));
        }

        public static string MakePlural(string word)
        {
            return ApplyRules(_plurals, word);
        }

        public static string MakeSingular(string word)
        {
            return ApplyRules(_singulars, word);
        }

        private static string ApplyRules(List<InflectorRule> rules, string word)
        {
            string result = word;
            if (!_uncountables.Contains(word.ToLower()))
            {
                for (int i = rules.Count - 1; i >= 0; i--)
                {
                    string currentPass = rules[i].Apply(word);
                    if (currentPass != null)
                    {
                        result = currentPass;
                        break;
                    }
                }
            }
            return result;
        }

        public static string ToTitleCase(string word)
        {
            return Regex.Replace(ToHumanCase(AddUnderscores(word)), @"\b([a-z])",
                                 delegate(Match match)
                                 {
                                     return match.Captures[0].Value.ToUpper();
                                 });
        }

        public static string ToHumanCase(string lowercaseAndUnderscoredWord)
        {
            return MakeInitialCaps(Regex.Replace(lowercaseAndUnderscoredWord, @"_", " "));
        }

        public static string ToPascalCase(string lowercaseAndUnderscoredWord)
        {
            return ToPascalCase(lowercaseAndUnderscoredWord, true);
        }

        ////TODO: What is this supposed to do? It doesn't convert "This Is My Word" to "ThisIsMyWord" -P.H. 2007.02.16
        //public static string ToPascalCase(string lowercaseAndUnderscoredWord, bool removeUnderscores) {
        //    string pattern = "(?:^|_)(.)";
        //    if (!removeUnderscores)
        //        pattern = "(?:^)(.)";

        //    return Regex.Replace(lowercaseAndUnderscoredWord, pattern,
        //                         delegate(Match match) {
        //                             return match.Groups[1].Value.ToUpper();
        //                         });
        //}

        /// <summary>
        /// Converts text to pascal case...
        /// </summary>
        /// <param name="text"></param>
        /// <param name="removeUnderscores"></param>
        /// <returns></returns>
        public static string ToPascalCase(string text, bool removeUnderscores)
        {
            if (String.IsNullOrEmpty(text))
                return text;

            text = text.Replace("_", " ");
            string joinString = removeUnderscores ? String.Empty : "_";
            string[] words = text.Split(' ');
            if (words.Length > 1 || Sugar.Validation.IsUpperCase(words[0]))
            {
                for (int i = 0; i < words.Length; i++)
                {
                    if (words[i].Length > 0)
                    {
                        string word = words[i];
                        string restOfWord = word.Substring(1);

                        if(Sugar.Validation.IsUpperCase(restOfWord))
                            restOfWord = restOfWord.ToLower(CultureInfo.CurrentUICulture);

                        char firstChar = char.ToUpper(word[0], CultureInfo.CurrentUICulture);
                        words[i] = firstChar + restOfWord;
                    }
                }
                return String.Join(joinString, words);
            }
            else
            {
                return words[0].Substring(0, 1).ToUpper(CultureInfo.CurrentUICulture) + words[0].Substring(1);
            }
        }

        public static string ToCamelCase(string lowercaseAndUnderscoredWord)
        {
            return MakeInitialLowerCase(ToPascalCase(lowercaseAndUnderscoredWord));
        }

        public static string AddUnderscores(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();
        }

        public static string MakeInitialCaps(string word)
        {
            return word.Substring(0, 1).ToUpper() + word.Substring(1).ToLower();
        }

        public static string MakeInitialLowerCase(string word)
        {
            return word.Substring(0, 1).ToLower() + word.Substring(1);
        }

        public static string AddOrdinalSuffix(string number)
        {
            if (Utility.IsStringNumeric(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";
                }
            }
            return number;
        }

        public static string ConvertUnderscoresToDashes(string underscoredWord)
        {
            return underscoredWord.Replace('_', '-');
        }
    }
}