/// <summary>
/// RMB capital
/// </summary>
/// <param name="input"> Input to be converted </param>
/// <param name="prefix"> You need to add a prefix of RMB </param>
/// <exception cref="ArgumentException" />
/// <returns> The converted result </returns>
public static string ToCapital(this string input, bool prefix = false) {
#region Step1 Input validation
if (!Regex.IsMatch(input, @"(?<=-|^)\d*\.?\d*$"))
throw new ArgumentException(" Incorrect input amount! ");
if (Regex.IsMatch(input, @"^\d{25,}"))
throw new ArgumentException(" The input data is too big to convert! ");
#endregion
#region Step2 Formatted as an intermediate string
var positionDic = new Dictionary<int, string> {
{0,"F"},{1,"J"},{2,"."},{3,"S"},{4,"B"},{5,"Q"},{6,"W"},{7,"SW"},{8,"BW"},{9,"QW"},
{10,"Y"},{11,"SY"},{12,"BY"},{13,"QY"},{14,"WY"},{15,"SWY"},{16,"BWY"},{17,"QWY"},{18,"YY"},
{19,"SYY"},{20,"BYY"},{21,"QYY"},{22,"WYY"},{23,"SWYY"},{24,"BWYY"},{25,"QWYY"}
};
input = Regex.Replace(input, @"^\.", "0.");
var integerPart = Regex.Replace(input, @"^-|\..*$", "");
var _matchDecimal = Regex.Match(input, @"\.\d*$", RegexOptions.None);
var decimalPart = Regex.Replace(_matchDecimal.Success ? Convert.ToDouble(_matchDecimal.Value).ToString("0.00") : "00", @"0\.", "");
var processStack = new Stack<string>();
var charsArray = (integerPart + decimalPart).Reverse<char>();
for (int i = 0; i < charsArray.Count(); i++) {
processStack.Push(string.Format("{0}{1}", charsArray.ElementAt(i), positionDic[i]));
}
// Symbolic processing
if (Regex.IsMatch(input, "^-", RegexOptions.None)) {
processStack.Push("-");
}
if (prefix) {
processStack.Push(" RMB ");
}
var process = string.Empty;
while (processStack.Count > 0) {
process += processStack.Pop();
}
// Semantic processing mode queues
Queue<Tuple<string, string, MatchEvaluator>> patterns = new Queue<Tuple<string, string, MatchEvaluator>>();
var patternBuilder = new StringBuilder();
for (int i = 3; i < positionDic.Count; i++) {
patternBuilder.AppendFormat("{0}{1}", (i == 3 ? "(0(?:" : "") + positionDic[i], i == positionDic.Count - 1 ? ")+?)+" : "|");
}
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(patternBuilder.ToString(), "0", null));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:QW|BW|SW|W|Q|B|S)?\d?YY)+", null, m => m.Value.Replace("YY", "") + "YY"));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:QW|BW|SW|W|Q|B|S)?\d?Y)+", null, m => m.Value.Replace("Y", "") + "Y"));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:Q|B|S)?\d?W)+", null, m => m.Value.Replace("W", "") + "W"));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?!^)0+\.", ".", null));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"^0\.0J|^0\.", "", null));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>("0J|0F", "0", null));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>("J0?$", "JZ", null));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"\.$|\.0+$", ".Z", null));
patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"^0+$|^[^.]{0}$", "0.Z", null));
while (patterns.Count > 0) {
var pattern = patterns.Dequeue();
if (pattern.Item3 != null) {
process = Regex.Replace(process, pattern.Item1, pattern.Item3);
}
else {
process = Regex.Replace(process, pattern.Item1, pattern.Item2);
}
}
#endregion
#region Step3 Translate intermediate strings
StringBuilder result = new StringBuilder();
var translatorDic = new Dictionary<char, string> {
{'0'," zero "},{'1'," one "},{'2'," Ii. "},{'3'," 3 "},{'4'," boss "},{'5'," wu "},{'6'," lu "},{'7'," Retailer, "},{'8'," "},{'9'," nine "},
{'S'," Pick up "},{'B'," hk "},{'Q'," micky "},{'W'," � "},{'Y'," Hundred million "},
{' RMB '," The yuan "},{'-'," negative "},{'.'," round "},{'J'," Angle "},{'F'," points "},{'Z'," The whole "}
};
for (int i = 0; i < process.Length; i++) {
result.Append(translatorDic[process[i]]);
}
#endregion
return result.ToString();
}