mcs/class/corlib/System/Int32.cs

   1 //
   2 // System.Int32.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 Int32 : IComparable, IFormattable { //, IConvertible {
  15                 private static Type Type = typeof (int);
  16
  17                 public const int MaxValue = 0x7fffffff;
  18                 public const int MinValue = -2147483648;
  19
  20                 public int value;
  21
  22                 public int CompareTo (object v)
  23                 {
  24                         if (v == null)
  25                                 return 1;
  26
  27                         if (!(v is System.Int32))
  28                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Int32"));
  29
  30                         int xv = (int) v;
  31                         if (value == xv)
  32                                 return 0;
  33                         if (value > xv)
  34                                 return 1;
  35                         else
  36                                 return -1;
  37                 }
  38
  39                 public override bool Equals (object o)
  40                 {
  41                         if (!(o is System.Int32))
  42                                 return false;
  43
  44                         return ((int) o) == value;
  45                 }
  46
  47                 public override int GetHashCode ()
  48                 {
  49                         return value;
  50                 }
  51
  52                 public static int Parse (string s)
  53                 {
  54                         int val = 0;
  55                         int len;
  56                         int i;
  57                         bool neg = false;
  58                         bool digits_seen = false;
  59
  60                         if (s == null)
  61                                 throw new ArgumentNullException (Locale.GetText ("s is null"));
  62
  63                         len = s.Length;
  64
  65                         char c;
  66                         for (i = 0; i < len; i++){
  67                                 c = s [i];
  68                                 if (!Char.IsWhiteSpace (c))
  69                                         break;
  70                         }
  71
  72                         if (i == len)
  73                                 throw new FormatException ();
  74
  75                         c = s [i];
  76                         if (c == '+')
  77                                 i++;
  78                         else if (c == '-'){
  79                                 neg = true;
  80                                 i++;
  81                         }
  82
  83                         for (; i < len; i++){
  84                                 c = s [i];
  85
  86                                 if (c >= '0' && c <= '9'){
  87                                         val = checked (val * 10 + (c - '0'));
  88                                         digits_seen = true;
  89                                 } else {
  90                                         if (Char.IsWhiteSpace (c)){
  91                                                 for (i++; i < len; i++){
  92                                                         if (!Char.IsWhiteSpace (s [i]))
  93                                                                 throw new FormatException ();
  94                                                 }
  95                                                 break;
  96                                         } else
  97                                                 throw new FormatException ();
  98                                 }
  99                         }
 100                         if (!digits_seen)
 101                                 throw new FormatException ();
 102
 103                         if (neg)
 104                                 val = -val;
 105
 106                         return val;
 107                 }
 108
 109                 public static int Parse (string s, IFormatProvider fp)
 110                 {
 111                         return Parse (s, NumberStyles.Integer, fp);
 112                 }
 113
 114                 public static int Parse (string s, NumberStyles style)
 115                 {
 116                         return Parse (s, style, null);
 117                 }
 118
 119                 [MonoTODO]
 120                 public static int Parse (string s, NumberStyles style, IFormatProvider fp)
 121                 {
 122                         // FIXME: Better than nothing ;-)
 123                         return Parse (s);
 124                         //throw new NotImplementedException ();
 125                 }
 126
 127                 public override string ToString ()
 128                 {
 129                         return ToString ("G", null);
 130                 }
 131
 132                 public string ToString (IFormatProvider fp)
 133                 {
 134                         return ToString ("G", fp);
 135                 }
 136
 137                 public string ToString (string format)
 138                 {
 139                         return ToString (format, null);
 140                 }
 141
 142                 public string ToString (string format, IFormatProvider fp)
 143                 {
 144                         string fmt;
 145                         NumberFormatInfo nfi;
 146
 147                         fmt = (format == null) ? "G" : format;
 148
 149                         if (fp == null)
 150                                 nfi = NumberFormatInfo.CurrentInfo;
 151                         else {
 152                                 nfi = (NumberFormatInfo) fp.GetFormat (Type);
 153
 154                                 if (nfi == null)
 155                                         nfi = NumberFormatInfo.CurrentInfo;
 156                         }
 157
 158                         return IntegerFormatter.NumberToString (fmt, nfi, value);
 159                 }
 160
 161                 // =========== IConvertible Methods =========== //
 162
 163                 public TypeCode GetTypeCode ()
 164                 {
 165                         return TypeCode.Int32;
 166                 }
 167         }
 168 }