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 // Copyright (C) 2004 Novell (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Globalization;
  31
  32 namespace System {
  33
  34         [Serializable]
  35         [System.Runtime.InteropServices.ComVisible (true)]
  36         public struct Int16 : IFormattable, IConvertible, IComparable, IComparable<Int16>, IEquatable <Int16>
  37         {
  38
  39                 public const short MaxValue =  32767;
  40                 public const short MinValue = -32768;
  41
  42                 internal short m_value;
  43
  44                 public int CompareTo (object value)
  45                 {
  46                         if (value == null)
  47                                 return 1;
  48
  49                         if (!(value is System.Int16))
  50                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Int16"));
  51
  52                         short xv = (short) value;
  53                         if (m_value == xv)
  54                                 return 0;
  55                         if (m_value > xv)
  56                                 return 1;
  57                         else
  58                                 return -1;
  59                 }
  60
  61                 public override bool Equals (object obj)
  62                 {
  63                         if (!(obj is System.Int16))
  64                                 return false;
  65
  66                         return ((short) obj) == m_value;
  67                 }
  68
  69                 public override int GetHashCode ()
  70                 {
  71                         return m_value;
  72                 }
  73
  74                 public int CompareTo (short value)
  75                 {
  76                         if (m_value == value)
  77                                 return 0;
  78                         if (m_value > value)
  79                                 return 1;
  80                         else
  81                                 return -1;
  82                 }
  83
  84                 public bool Equals (short obj)
  85                 {
  86                         return obj == m_value;
  87                 }
  88
  89                 internal static bool Parse (string s, bool tryParse, out short result, out Exception exc)
  90                 {
  91                         short val = 0;
  92                         int len;
  93                         int i, sign = 1;
  94                         bool digits_seen = false;
  95
  96                         result = 0;
  97                         exc = null;
  98
  99                         if (s == null) {
 100                                 if (!tryParse)
 101                                         exc = new ArgumentNullException ("s");
 102                                 return false;
 103                         }
 104
 105                         len = s.Length;
 106
 107                         char c;
 108                         for (i = 0; i < len; i++){
 109                                 c = s [i];
 110                                 if (!Char.IsWhiteSpace (c))
 111                                         break;
 112                         }
 113
 114                         if (i == len) {
 115                                 if (!tryParse)
 116                                         exc = Int32.GetFormatException ();
 117                                 return false;
 118                         }
 119
 120                         c = s [i];
 121                         if (c == '+')
 122                                 i++;
 123                         else if (c == '-'){
 124                                 sign = -1;
 125                                 i++;
 126                         }
 127
 128                         for (; i < len; i++){
 129                                 c = s [i];
 130                                 if (c >= '0' && c <= '9'){
 131                                         byte d = (byte) (c - '0');
 132
 133                                         if (val > (MaxValue/10))
 134                                                 goto overflow;
 135
 136                                         if (val == (MaxValue/10)){
 137                                                 if ((d > (MaxValue % 10)) && (sign == 1 || (d > ((MaxValue % 10) + 1))))
 138                                                         goto overflow;
 139                                                 if (sign == -1)
 140                                                         val = (short) ((val * sign * 10) - d);
 141                                                 else
 142                                                         val = (short) ((val * 10) + d);
 143
 144                                                 if (Int32.ProcessTrailingWhitespace (tryParse, s, i + 1, ref exc)){
 145                                                         result = val;
 146                                                         return true;
 147                                                 }
 148                                                 goto overflow;
 149                                         } else
 150                                                 val = (short) (val * 10 + d);
 151
 152
 153                                         digits_seen = true;
 154                                 } else if (!Int32.ProcessTrailingWhitespace (tryParse, s, i, ref exc))
 155                                         return false;
 156
 157                         }
 158                         if (!digits_seen) {
 159                                 if (!tryParse)
 160                                         exc = Int32.GetFormatException ();
 161                                 return false;
 162                         }
 163
 164                         if (sign == -1)
 165                                 result = (short) (val * sign);
 166                         else
 167                                 result = val;
 168
 169                         return true;
 170
 171                 overflow:
 172                         if (!tryParse)
 173                                 exc = new OverflowException ("Value is too large");
 174                         return false;
 175                 }
 176
 177                 public static short Parse (string s, IFormatProvider provider)
 178                 {
 179                         return Parse (s, NumberStyles.Integer, provider);
 180                 }
 181
 182                 public static short Parse (string s, NumberStyles style)
 183                 {
 184                         return Parse (s, style, null);
 185                 }
 186
 187                 public static short Parse (string s, NumberStyles style, IFormatProvider provider)
 188                 {
 189                         int tmpResult = Int32.Parse (s, style, provider);
 190                         if (tmpResult > Int16.MaxValue || tmpResult < Int16.MinValue)
 191                                 throw new OverflowException ("Value too large or too small.");
 192
 193                         return (short) tmpResult;
 194                 }
 195
 196                 public static short Parse (string s)
 197                 {
 198                         Exception exc;
 199                         short res;
 200
 201                         if (!Parse (s, false, out res, out exc))
 202                                 throw exc;
 203
 204                         return res;
 205                 }
 206
 207                 public static bool TryParse (string s, out short result)
 208                 {
 209                         Exception exc;
 210                         if (!Parse (s, true, out result, out exc)) {
 211                                 result = 0;
 212                                 return false;
 213                         }
 214
 215                         return true;
 216                 }
 217
 218                 public static bool TryParse (string s, NumberStyles style, IFormatProvider provider, out short result)
 219                 {
 220                         int tmpResult;
 221                         result = 0;
 222
 223                         if (!Int32.TryParse (s, style, provider, out tmpResult))
 224                                 return false;
 225
 226                         if (tmpResult > Int16.MaxValue || tmpResult < Int16.MinValue)
 227                                 return false;
 228
 229                         result = (short)tmpResult;
 230                         return true;
 231                 }
 232
 233                 public override string ToString ()
 234                 {
 235                         return NumberFormatter.NumberToString (m_value, null);
 236                 }
 237
 238                 public string ToString (IFormatProvider provider)
 239                 {
 240                         return NumberFormatter.NumberToString (m_value, provider);
 241                 }
 242
 243                 public string ToString (string format)
 244                 {
 245                         return ToString (format, null);
 246                 }
 247
 248                 public string ToString (string format, IFormatProvider provider)
 249                 {
 250                         return NumberFormatter.NumberToString(format, m_value, provider);
 251                 }
 252
 253                 // =========== IConvertible Methods =========== //
 254
 255                 public TypeCode GetTypeCode ()
 256                 {
 257                         return TypeCode.Int16;
 258                 }
 259
 260                 bool IConvertible.ToBoolean (IFormatProvider provider)
 261                 {
 262                         return System.Convert.ToBoolean (m_value);
 263                 }
 264
 265                 byte IConvertible.ToByte (IFormatProvider provider)
 266                 {
 267                         return System.Convert.ToByte (m_value);
 268                 }
 269
 270                 char IConvertible.ToChar (IFormatProvider provider)
 271                 {
 272                         return System.Convert.ToChar (m_value);
 273                 }
 274
 275                 DateTime IConvertible.ToDateTime (IFormatProvider provider)
 276                 {
 277                         return System.Convert.ToDateTime (m_value);
 278                 }
 279
 280                 decimal IConvertible.ToDecimal (IFormatProvider provider)
 281                 {
 282                         return System.Convert.ToDecimal (m_value);
 283                 }
 284
 285                 double IConvertible.ToDouble (IFormatProvider provider)
 286                 {
 287                         return System.Convert.ToDouble (m_value);
 288                 }
 289
 290                 short IConvertible.ToInt16 (IFormatProvider provider)
 291                 {
 292                         return System.Convert.ToInt16 (m_value);
 293                 }
 294
 295                 int IConvertible.ToInt32 (IFormatProvider provider)
 296                 {
 297                         return System.Convert.ToInt32 (m_value);
 298                 }
 299
 300                 long IConvertible.ToInt64 (IFormatProvider provider)
 301                 {
 302                         return System.Convert.ToInt64 (m_value);
 303                 }
 304
 305                 sbyte IConvertible.ToSByte (IFormatProvider provider)
 306                 {
 307                         return System.Convert.ToSByte (m_value);
 308                 }
 309
 310                 float IConvertible.ToSingle (IFormatProvider provider)
 311                 {
 312                         return System.Convert.ToSingle (m_value);
 313                 }
 314
 315                 object IConvertible.ToType (Type targetType, IFormatProvider provider)
 316                 {
 317                         if (targetType == null)
 318                                 throw new ArgumentNullException ("targetType");
 319                         return System.Convert.ToType (m_value, targetType, provider, false);
 320                 }
 321
 322                 ushort IConvertible.ToUInt16 (IFormatProvider provider)
 323                 {
 324                         return System.Convert.ToUInt16 (m_value);
 325                 }
 326
 327                 uint IConvertible.ToUInt32 (IFormatProvider provider)
 328                 {
 329                         return System.Convert.ToUInt32 (m_value);
 330                 }
 331
 332                 ulong IConvertible.ToUInt64 (IFormatProvider provider)
 333                 {
 334                         return System.Convert.ToUInt64 (m_value);
 335                 }
 336         }
 337 }