irc/TechBot/TechBot.Library/NumberParser.cs

   1 using System;
   2 using System.Globalization;
   3
   4 namespace TechBot.Library
   5 {
   6         public class NumberParser
   7         {
   8                 public bool Error = false;
   9
  10                 private const string SpecialHexCharacters = "ABCDEF";
  11
  12                 private bool IsSpecialHexCharacter(char ch)
  13                 {
  14                         foreach (char specialChar in SpecialHexCharacters)
  15                         {
  16                                 if (ch.ToString().ToUpper() == specialChar.ToString())
  17                                         return true;
  18                         }
  19                         return false;
  20                 }
  21
  22                 private bool HasSpecialHexCharacters(string s)
  23                 {
  24                         foreach (char ch in s)
  25                         {
  26                                 if (IsSpecialHexCharacter(ch))
  27                                         return true;
  28                         }
  29                         return false;
  30                 }
  31
  32                 public long Parse(string s)
  33                 {
  34                         try
  35                         {
  36                                 Error = false;
  37                                 bool useHex = false;
  38                                 if (s.StartsWith("0x"))
  39                                 {
  40                                         s = s.Substring(2);
  41                                         useHex = true;
  42                                 }
  43                                 if (HasSpecialHexCharacters(s))
  44                                         useHex = true;
  45                                 if (useHex)
  46                                         return Int64.Parse(s,
  47                                                            NumberStyles.HexNumber);
  48                                 else
  49                                         return Int64.Parse(s);
  50                         }
  51                         catch (FormatException)
  52                         {
  53                                 Error = true;
  54                         }
  55                         catch (OverflowException)
  56                         {
  57                                 Error = true;
  58                         }
  59                         return -1;
  60                 }
  61         }
  62 }