using System;
using System.Diagnostics;
using System.Globalization;

public class Babel {

  /*
  <identifier> ::= <identifier_start> ( <identifier_start> | <identifier_extend> )*

  <identifier_start> ::= [{Lu}{Ll}{Lt}{Lm}{Lo}{Nl}]

  <identifier_extend> ::= [{Mn}{Mc}{Nd}{Pc}{Cf}]
  
  ref. http://www.unicode.org/unicode/reports/tr15/tr15-18.html
  */

  private bool IsLegalIdentifierStart(char c) {
    UnicodeCategory cat = char.GetUnicodeCategory(c);
    return ((cat == UnicodeCategory.UppercaseLetter)
      || (cat == UnicodeCategory.LowercaseLetter)
      || (cat == UnicodeCategory.TitlecaseLetter)
      || (cat == UnicodeCategory.ModifierLetter)
      || (cat == UnicodeCategory.OtherLetter)
      || (cat == UnicodeCategory.LetterNumber));
  }

  private bool IsLegalIdentifierExtend(char c) {
    UnicodeCategory cat = char.GetUnicodeCategory(c);
    return (IsLegalIdentifierStart(c)
      || (cat == UnicodeCategory.NonSpacingMark)
      || (cat == UnicodeCategory.SpacingCombiningMark)
      || (cat == UnicodeCategory.DecimalDigitNumber)
      || (cat == UnicodeCategory.ConnectorPunctuation)
      || (cat == UnicodeCategory.Format));
  }

  private bool IsLegalIdentifier(string name) {
    if ((name == null) || (name.Length == 0))
      return false;
    if (!IsLegalIdentifierStart(name[0]))
      return false;
    for (int i=1; i<name.Length; i++)
      if (!IsLegalIdentifierExtend(name[i]))
        return false;
    return true;
  }

  private void PrintMe() {
    StackTrace st = new StackTrace();
    string name = st.GetFrame(1).GetMethod().Name;
    Console.WriteLine(name);
    foreach (char c in name)
      Console.WriteLine("{0} cat:{1} letter:{2} letter/digit:{3}",
        c, char.GetUnicodeCategory(c), char.IsLetter(c), 
        char.IsLetterOrDigit(c));
    Console.WriteLine("legal: {0}", IsLegalIdentifier(name));
    Console.WriteLine();
  }



  public void Æ⃕ØÆæø̸िå() {
    PrintMe();
  }

  public void ěš̸čř・žţş١٢‿٣() {
    PrintMe();
  }

  public void ǞǠ፬ǟ３ǡ௫() {
    PrintMe();
  }

  public void ʣ̸ʤʦʧʨʰʱʲ() {
    PrintMe();
  }

  public void էըթի() {
    PrintMe();
  }

  public void ऑऒओ() {
    PrintMe();
  }

  public void 暢暣暤() {
    PrintMe();
  }

  public void ムメャⅫ() {
    PrintMe();
  }

  public void ﷲﷳ() {
    PrintMe();
  }

}