mcs/class/corlib/System/Int16.cs

   1 //
   2 // System.Int16.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) Ximian, Inc.  http://www.ximian.com
   8 //
   9
  10 using System.Globalization;
  11
  12 namespace System {
  13
  14         public struct Int16 : IComparable, IFormattable { //, IConvertible {
  15                 private static Type Type = typeof (short);
  16
  17                 public const short MaxValue =  32767;
  18                 public const short MinValue = -32768;
  19
  20                 // VES needs to know about value.  public is workaround
  21                 // so source will compile
  22                 public short value;
  23
  24                 public int CompareTo (object v)
  25                 {
  26                         if (v == null)
  27                                 return 1;
  28
  29                         if (!(v is System.Int16))
  30                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Int16"));
  31
  32                         short xv = (short) v;
  33                         if (value == xv)
  34                                 return 0;
  35                         if (value > xv)
  36                                 return 1;
  37                         else
  38                                 return -1;
  39                 }
  40
  41                 public override bool Equals (object o)
  42                 {
  43                         if (!(o is System.Int16))
  44                                 return false;
  45
  46                         return ((short) o) == value;
  47                 }
  48
  49                 public override int GetHashCode ()
  50                 {
  51                         return value;
  52                 }
  53
  54                 public static short Parse (string s)
  55                 {
  56                         short val = 0;
  57                         int len;
  58                         int i;
  59                         bool neg = false;
  60                         bool digits_seen = false;
  61
  62                         if (s == null)
  63                                 throw new ArgumentNullException (Locale.GetText ("s is null"));
  64
  65                         len = s.Length;
  66
  67                         char c;
  68                         for (i = 0; i < len; i++){
  69                                 c = s [i];
  70                                 if (!Char.IsWhiteSpace (c))
  71                                         break;
  72                         }
  73
  74                         if (i == len)
  75                                 throw new FormatException ();
  76
  77                         c = s [i];
  78                         if (c == '+')
  79                                 i++;
  80                         else if (c == '-'){
  81                                 neg = true;
  82                                 i++;
  83                         }
  84
  85                         for (; i < len; i++){
  86                                 c = s [i];
  87
  88                                 if (c >= '0' && c <= '9'){
  89                                         val = checked ((short) (val * 10 + (c - '0')));
  90                                         digits_seen = true;
  91                                 } else {
  92                                         if (Char.IsWhiteSpace (c)){
  93                                                 for (i++; i < len; i++){
  94                                                         if (!Char.IsWhiteSpace (s [i]))
  95                                                                 throw new FormatException ();
  96                                                 }
  97                                                 break;
  98                                         } else
  99                                                 throw new FormatException ();
 100                                 }
 101                         }
 102                         if (!digits_seen)
 103                                 throw new FormatException ();
 104
 105                         if (neg)
 106                                 val = checked ((short) -val);
 107
 108                         return val;
 109                 }
 110
 111                 public static short Parse (string s, IFormatProvider fp)
 112                 {
 113                         return Parse (s, NumberStyles.Integer, fp);
 114                 }
 115
 116                 public static short Parse (string s, NumberStyles style)
 117                 {
 118                         return Parse (s, style, null);
 119                 }
 120
 121                 public static short Parse (string s, NumberStyles style, IFormatProvider fp)
 122                 {
 123                         throw new NotImplementedException ();
 124                 }
 125
 126                 public override string ToString ()
 127                 {
 128                         return ToString ("G", null);
 129                 }
 130
 131                 public string ToString (IFormatProvider fp)
 132                 {
 133                         return ToString ("G", fp);
 134                 }
 135
 136                 public string ToString (string format)
 137                 {
 138                         return ToString (format, null);
 139                 }
 140
 141                 public string ToString (string format, IFormatProvider fp)
 142                 {
 143                         string fmt;
 144                         NumberFormatInfo nfi;
 145
 146                         fmt = (format == null) ? "G" : format;
 147
 148                         if (fp == null)
 149                                 nfi = NumberFormatInfo.CurrentInfo;
 150                         else {
 151                                 nfi = (NumberFormatInfo) fp.GetFormat (Type);
 152
 153                                 if (nfi == null)
 154                                         nfi = NumberFormatInfo.CurrentInfo;
 155                         }
 156
 157                         return IntegerFormatter.NumberToString (fmt, nfi, value);
 158                 }
 159
 160                 // =========== IConvertible Methods =========== //
 161
 162                 public TypeCode GetTypeCode ()
 163                 {
 164                         return TypeCode.Int16;
 165                 }
 166         }
 167 }