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 #if NET_2_0
  36         [System.Runtime.InteropServices.ComVisible (true)]
  37 #endif
  38         public struct Int16 : IFormattable, IConvertible, IComparable
  39 #if NET_2_0
  40                 , IComparable<Int16>, IEquatable <Int16>
  41 #endif
  42         {
  43
  44                 public const short MaxValue =  32767;
  45                 public const short MinValue = -32768;
  46
  47                 internal short m_value;
  48
  49                 public int CompareTo (object v)
  50                 {
  51                         if (v == null)
  52                                 return 1;
  53
  54                         if (!(v is System.Int16))
  55                                 throw new ArgumentException (Locale.GetText ("Value is not a System.Int16"));
  56
  57                         short xv = (short) v;
  58                         if (m_value == xv)
  59                                 return 0;
  60                         if (m_value > xv)
  61                                 return 1;
  62                         else
  63                                 return -1;
  64                 }
  65
  66                 public override bool Equals (object o)
  67                 {
  68                         if (!(o is System.Int16))
  69                                 return false;
  70
  71                         return ((short) o) == m_value;
  72                 }
  73
  74                 public override int GetHashCode ()
  75                 {
  76                         return m_value;
  77                 }
  78
  79 #if NET_2_0
  80                 public int CompareTo (short value)
  81                 {
  82                         if (m_value == value)
  83                                 return 0;
  84                         if (m_value > value)
  85                                 return 1;
  86                         else
  87                                 return -1;
  88                 }
  89
  90                 public bool Equals (short value)
  91                 {
  92                         return value == m_value;
  93                 }
  94 #endif
  95
  96                 internal static bool Parse (string s, bool tryParse, out short result, out Exception exc)
  97                 {
  98                         short val = 0;
  99                         int len;
 100                         int i, sign = 1;
 101                         bool digits_seen = false;
 102
 103                         result = 0;
 104                         exc = null;
 105
 106                         if (s == null) {
 107                                 if (!tryParse)
 108                                         exc = new ArgumentNullException ("s");
 109                                 return false;
 110                         }
 111
 112                         len = s.Length;
 113
 114                         char c;
 115                         for (i = 0; i < len; i++){
 116                                 c = s [i];
 117                                 if (!Char.IsWhiteSpace (c))
 118                                         break;
 119                         }
 120
 121                         if (i == len) {
 122                                 if (!tryParse)
 123                                         exc = Int32.GetFormatException ();
 124                                 return false;
 125                         }
 126
 127                         c = s [i];
 128                         if (c == '+')
 129                                 i++;
 130                         else if (c == '-'){
 131                                 sign = -1;
 132                                 i++;
 133                         }
 134
 135                         for (; i < len; i++){
 136                                 c = s [i];
 137                                 if (c >= '0' && c <= '9'){
 138                                         byte d = (byte) (c - '0');
 139
 140                                         if (val > (MaxValue/10))
 141                                                 goto overflow;
 142
 143                                         if (val == (MaxValue/10)){
 144                                                 if ((d > (MaxValue % 10)) && (sign == 1 || (d > ((MaxValue % 10) + 1))))
 145                                                         goto overflow;
 146                                                 if (sign == -1)
 147                                                         val = (short) ((val * sign * 10) - d);
 148                                                 else
 149                                                         val = (short) ((val * 10) + d);
 150
 151                                                 if (Int32.ProcessTrailingWhitespace (tryParse, s, i + 1, ref exc)){
 152                                                         result = val;
 153                                                         return true;
 154                                                 }
 155                                                 goto overflow;
 156                                         } else
 157                                                 val = (short) (val * 10 + d);
 158
 159
 160                                         digits_seen = true;
 161                                 } else if (!Int32.ProcessTrailingWhitespace (tryParse, s, i, ref exc))
 162                                         return false;
 163
 164                         }
 165                         if (!digits_seen) {
 166                                 if (!tryParse)
 167                                         exc = Int32.GetFormatException ();
 168                                 return false;
 169                         }
 170
 171                         if (sign == -1)
 172                                 result = (short) (val * sign);
 173                         else
 174                                 result = val;
 175
 176                         return true;
 177
 178                 overflow:
 179                         if (!tryParse)
 180                                 exc = new OverflowException ("Value is too large");
 181                         return false;
 182                 }
 183
 184                 public static short Parse (string s, IFormatProvider fp)
 185                 {
 186                         return Parse (s, NumberStyles.Integer, fp);
 187                 }
 188
 189                 public static short Parse (string s, NumberStyles style)
 190                 {
 191                         return Parse (s, style, null);
 192                 }
 193
 194                 public static short Parse (string s, NumberStyles style, IFormatProvider fp)
 195                 {
 196                         int tmpResult = Int32.Parse (s, style, fp);
 197                         if (tmpResult > Int16.MaxValue || tmpResult < Int16.MinValue)
 198                                 throw new OverflowException ("Value too large or too small.");
 199
 200                         return (short) tmpResult;
 201                 }
 202
 203                 public static short Parse (string s)
 204                 {
 205                         Exception exc;
 206                         short res;
 207
 208                         if (!Parse (s, false, out res, out exc))
 209                                 throw exc;
 210
 211                         return res;
 212                 }
 213
 214 #if NET_2_0
 215                 public static bool TryParse (string s, out short result)
 216                 {
 217                         Exception exc;
 218                         if (!Parse (s, true, out result, out exc)) {
 219                                 result = 0;
 220                                 return false;
 221                         }
 222
 223                         return true;
 224                 }
 225
 226                 public static bool TryParse (string s, NumberStyles style, IFormatProvider provider, out short result)
 227                 {
 228                         int tmpResult;
 229                         result = 0;
 230
 231                         if (!Int32.TryParse (s, style, provider, out tmpResult))
 232                                 return false;
 233
 234                         if (tmpResult > Int16.MaxValue || tmpResult < Int16.MinValue)
 235                                 return false;
 236
 237                         result = (short)tmpResult;
 238                         return true;
 239                 }
 240 #endif
 241
 242                 public override string ToString ()
 243                 {
 244                         return new NumberFormatter(null, m_value).FormatDecimal(-1, null);
 245                 }
 246
 247                 public string ToString (IFormatProvider provider)
 248                 {
 249                         NumberFormatInfo nfi = NumberFormatInfo.GetInstance (provider);
 250                         return new NumberFormatter(null, m_value).FormatDecimal(-1, nfi);
 251                 }
 252
 253                 public string ToString (string format)
 254                 {
 255                         return ToString (format, null);
 256                 }
 257
 258                 public string ToString (string format, IFormatProvider fp)
 259                 {
 260                         NumberFormatInfo nfi = NumberFormatInfo.GetInstance( fp );
 261                         return NumberFormatter.NumberToString(format, m_value, nfi);
 262                 }
 263
 264                 // =========== IConvertible Methods =========== //
 265
 266                 public TypeCode GetTypeCode ()
 267                 {
 268                         return TypeCode.Int16;
 269                 }
 270
 271                 bool IConvertible.ToBoolean (IFormatProvider provider)
 272                 {
 273                         return System.Convert.ToBoolean (m_value);
 274                 }
 275
 276                 byte IConvertible.ToByte (IFormatProvider provider)
 277                 {
 278                         return System.Convert.ToByte (m_value);
 279                 }
 280
 281                 char IConvertible.ToChar (IFormatProvider provider)
 282                 {
 283                         return System.Convert.ToChar (m_value);
 284                 }
 285
 286                 DateTime IConvertible.ToDateTime (IFormatProvider provider)
 287                 {
 288                         return System.Convert.ToDateTime (m_value);
 289                 }
 290
 291                 decimal IConvertible.ToDecimal (IFormatProvider provider)
 292                 {
 293                         return System.Convert.ToDecimal (m_value);
 294                 }
 295
 296                 double IConvertible.ToDouble (IFormatProvider provider)
 297                 {
 298                         return System.Convert.ToDouble (m_value);
 299                 }
 300
 301                 short IConvertible.ToInt16 (IFormatProvider provider)
 302                 {
 303                         return System.Convert.ToInt16 (m_value);
 304                 }
 305
 306                 int IConvertible.ToInt32 (IFormatProvider provider)
 307                 {
 308                         return System.Convert.ToInt32 (m_value);
 309                 }
 310
 311                 long IConvertible.ToInt64 (IFormatProvider provider)
 312                 {
 313                         return System.Convert.ToInt64 (m_value);
 314                 }
 315
 316                 sbyte IConvertible.ToSByte (IFormatProvider provider)
 317                 {
 318                         return System.Convert.ToSByte (m_value);
 319                 }
 320
 321                 float IConvertible.ToSingle (IFormatProvider provider)
 322                 {
 323                         return System.Convert.ToSingle (m_value);
 324                 }
 325
 326                 object IConvertible.ToType (Type conversionType, IFormatProvider provider)
 327                 {
 328                         return System.Convert.ToType (m_value, conversionType, provider);
 329                 }
 330
 331                 ushort IConvertible.ToUInt16 (IFormatProvider provider)
 332                 {
 333                         return System.Convert.ToUInt16 (m_value);
 334                 }
 335
 336                 uint IConvertible.ToUInt32 (IFormatProvider provider)
 337                 {
 338                         return System.Convert.ToUInt32 (m_value);
 339                 }
 340
 341                 ulong IConvertible.ToUInt64 (IFormatProvider provider)
 342                 {
 343                         return System.Convert.ToUInt64 (m_value);
 344                 }
 345         }
 346 }