mcs/class/System.Web/System.Web.UI.WebControls/Unit.cs

   1 //
   2 // System.Web.UI.WebControls.Unit.cs
   3 //
   4 // Authors:
   5 //   Miguel de Icaza (miguel@novell.com)
   6 //   Ben Maurer (bmaurer@ximian.com).
   7 //
   8 // Copyright (C) 2005 Novell, Inc (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 using System.ComponentModel;
  32 using System.Security.Permissions;
  33 using System.Web.Util;
  34
  35 namespace System.Web.UI.WebControls {
  36
  37         [TypeConverter(typeof (UnitConverter))]
  38         [Serializable]
  39         public struct Unit {
  40                 enum ParsingStage
  41                 {
  42                         Trim,
  43                         SignOrSep,
  44                         DigitOrSep,
  45                         DigitOrUnit,
  46                         Unit
  47                 }
  48
  49                 UnitType type;
  50                 double value;
  51                 bool valueSet;
  52                 public static readonly Unit Empty;
  53
  54                 public Unit (double value, UnitType type)
  55                 {
  56                         if (value < -32768 || value > 32767)
  57                                 throw new ArgumentOutOfRangeException ("value");
  58
  59                         this.type = type;
  60                         if (type == UnitType.Pixel)
  61                                 this.value = (int) value;
  62                         else
  63                                 this.value = value;
  64                         valueSet = true;
  65                 }
  66
  67                 public Unit (double value) : this (value, UnitType.Pixel)
  68                 {
  69                 }
  70
  71                 public Unit (int value) : this ((double) value, UnitType.Pixel)
  72                 {
  73                 }
  74
  75                 internal Unit (string input, char sep)
  76                 {
  77                         if (input == null || input == String.Empty){
  78                                 type = (UnitType) 0;
  79                                 value = 0.0;
  80                                 valueSet = false;
  81                                 return;
  82                         }
  83
  84                         value = 0.0;
  85                         double dv = 0, factor = .1;
  86                         int i = 0;
  87                         int count = input.Length;
  88                         int sign = 1, unitStart = -1, unitLen = 0, wsCount = 0;
  89                         char c;
  90                         ParsingStage ps = ParsingStage.Trim;
  91                         bool done = false, haveSep = false, haveDigits = false, isWhiteSpace;
  92
  93                         while (!done && i < count) {
  94                                 c = input [i];
  95
  96                                 switch (ps) {
  97                                         case ParsingStage.Trim:
  98                                                 if (Char.IsWhiteSpace (c)) {
  99                                                         i++;
 100                                                         continue;
 101                                                 }
 102                                                 ps = ParsingStage.SignOrSep;
 103                                                 continue;
 104
 105                                         case ParsingStage.SignOrSep:
 106                                                 wsCount = 0;
 107                                                 if (c == '-') {
 108                                                         sign = -1;
 109                                                         i++;
 110                                                         ps = ParsingStage.DigitOrSep;
 111                                                         continue;
 112                                                 }
 113
 114                                                 if (c == sep) {
 115                                                         i++;
 116                                                         haveSep = true;
 117                                                         ps = ParsingStage.DigitOrUnit;
 118                                                         dv = 0;
 119                                                         continue;
 120                                                 }
 121
 122                                                 if (Char.IsDigit (c)) {
 123                                                         ps = ParsingStage.DigitOrSep;
 124                                                         continue;
 125                                                 }
 126
 127                                                 throw new FormatException ();
 128
 129                                         case ParsingStage.DigitOrSep:
 130                                                 if (Char.IsDigit (c)) {
 131                                                         dv = dv * 10 + ((int) c) - ((int)'0');
 132                                                         i++;
 133                                                         haveDigits = true;
 134                                                         continue;
 135                                                 }
 136
 137                                                 if (c == sep) {
 138                                                         if (wsCount > 0)
 139                                                                 throw new ArgumentOutOfRangeException ("input");
 140
 141                                                         i++;
 142                                                         haveSep = true;
 143                                                         value = dv * sign;
 144                                                         dv = 0;
 145                                                         ps = ParsingStage.DigitOrUnit;
 146                                                         continue;
 147                                                 }
 148
 149                                                 isWhiteSpace = Char.IsWhiteSpace (c);
 150                                                 if (isWhiteSpace || c == '%' || Char.IsLetter (c)) {
 151                                                         if (isWhiteSpace) {
 152                                                                 if (!haveDigits)
 153                                                                         throw new ArgumentOutOfRangeException ("input");
 154                                                                 wsCount++;
 155                                                                 i++;
 156                                                                 continue;
 157                                                         }
 158
 159                                                         value = dv * sign;
 160                                                         dv = 0;
 161                                                         unitStart = i;
 162
 163                                                         if (haveSep) {
 164                                                                 haveDigits = false;
 165                                                                 ps = ParsingStage.DigitOrUnit;
 166                                                         } else
 167                                                                 ps = ParsingStage.Unit;
 168                                                         wsCount = 0;
 169                                                         continue;
 170                                                 }
 171
 172                                                 throw new FormatException ();
 173
 174                                         case ParsingStage.DigitOrUnit:
 175                                                 if (c == '%') {
 176                                                         unitStart = i;
 177                                                         unitLen = 1;
 178                                                         done = true;
 179                                                         continue;
 180                                                 }
 181
 182                                                 isWhiteSpace = Char.IsWhiteSpace (c);
 183                                                 if (isWhiteSpace || Char.IsLetter (c)) {
 184                                                         if (isWhiteSpace) {
 185                                                                 wsCount++;
 186                                                                 i++;
 187                                                                 continue;
 188                                                         }
 189
 190                                                         ps = ParsingStage.Unit;
 191                                                         unitStart = i;
 192                                                         continue;
 193                                                 }
 194
 195                                                 if (Char.IsDigit (c)) {
 196                                                         if (wsCount > 0)
 197                                                                 throw new ArgumentOutOfRangeException ();
 198
 199                                                         dv = dv + (((int) c) - ((int) '0')) * factor;
 200                                                         factor = factor *.1;
 201                                                         i++;
 202                                                         continue;
 203                                                 }
 204
 205                                                 throw new FormatException ();
 206
 207                                         case ParsingStage.Unit:
 208                                                 if (c == '%' || Char.IsLetter (c)) {
 209                                                         i++;
 210                                                         unitLen++;
 211                                                         continue;
 212                                                 }
 213
 214                                                 if (unitLen == 0 && Char.IsWhiteSpace (c)) {
 215                                                         i++;
 216                                                         unitStart++;
 217                                                         continue;
 218                                                 }
 219
 220                                                 done = true;
 221                                                 break;
 222                                 }
 223                         }
 224
 225                         value += dv * sign;
 226                         if (unitStart >= 0) {
 227                                 int unitTail = unitStart + unitLen;
 228                                 if (unitTail < count) {
 229                                         for (int j = unitTail; j < count; j++) {
 230                                                 if (!Char.IsWhiteSpace (input [j]))
 231                                                         throw new ArgumentOutOfRangeException ("input");
 232                                         }
 233                                 }
 234
 235                                 if (unitLen == 1 && input [unitStart] == '%')
 236                                         type = UnitType.Percentage;
 237                                 else {
 238                                         switch (input.Substring (unitStart, unitLen).ToLower (Helpers.InvariantCulture)) {
 239                                                 case "in": type = UnitType.Inch; break;
 240                                                 case "cm": type = UnitType.Cm; break;
 241                                                 case "mm": type = UnitType.Mm; break;
 242                                                 case "pt": type = UnitType.Point; break;
 243                                                 case "pc": type = UnitType.Pica; break;
 244                                                 case "em": type = UnitType.Em; break;
 245                                                 case "ex": type = UnitType.Ex; break;
 246                                                 case "px":
 247                                                         type = UnitType.Pixel;
 248                                                         break;
 249                                                 default:
 250                                                         throw new ArgumentOutOfRangeException ("value");
 251                                         }
 252                                 }
 253                         } else
 254                                 type = UnitType.Pixel;
 255
 256                         if (haveSep && type == UnitType.Pixel)
 257                                 throw new FormatException ("Pixel units do not allow floating point values");
 258                         valueSet = true;
 259                 }
 260
 261                 public Unit (string value) : this (value, '.')
 262                 {
 263                 }
 264
 265                 public Unit (string value, CultureInfo culture) : this (value, culture.NumberFormat.NumberDecimalSeparator [0])
 266                 {
 267                 }
 268
 269                 internal Unit (string value, CultureInfo culture, UnitType t) : this (value, '.')
 270                 {
 271                 }
 272
 273                 public bool IsEmpty {
 274                         get {
 275                                 return type == 0;
 276                         }
 277                 }
 278
 279                 public UnitType Type {
 280                         get {
 281                                 if (type == 0)
 282                                         return UnitType.Pixel;
 283                                 return type;
 284                         }
 285                 }
 286
 287                 public double Value {
 288                         get {
 289                                 return value;
 290                         }
 291                 }
 292
 293                 public static Unit Parse (string s)
 294                 {
 295                         return new Unit (s);
 296                 }
 297
 298                 public static System.Web.UI.WebControls.Unit Parse (string s, System.Globalization.CultureInfo culture)
 299                 {
 300                         return new Unit (s, culture);
 301                 }
 302
 303
 304                 public static Unit Percentage (double n)
 305                 {
 306                         return new Unit (n, UnitType.Percentage);
 307                 }
 308
 309                 public static Unit Pixel (int n)
 310                 {
 311                         return new Unit (n);
 312                 }
 313
 314                 public static Unit Point (int n)
 315                 {
 316                         return new Unit (n, UnitType.Point);
 317                 }
 318
 319                 public override bool Equals (object obj)
 320                 {
 321                         if (obj is Unit){
 322                                 Unit other = (Unit) obj;
 323                                 return (other.type == type && other.value == value && valueSet == other.valueSet);
 324                         }
 325                         return false;
 326                 }
 327
 328                 public override int GetHashCode ()
 329                 {
 330                         return Type.GetHashCode () ^ Value.GetHashCode ();
 331                 }
 332
 333                 public static bool operator == (Unit left, Unit right)
 334                 {
 335                         return left.Type == right.Type && left.Value == right.Value && left.valueSet == right.valueSet;
 336                 }
 337
 338                 public static bool operator != (Unit left, Unit right)
 339                 {
 340                         return left.Type != right.Type || left.Value != right.Value || left.valueSet != right.valueSet;
 341                 }
 342
 343                 public static implicit operator Unit (int n)
 344                 {
 345                         return new Unit (n);
 346                 }
 347
 348                 internal static string GetExtension (UnitType type)
 349                 {
 350                         switch (type){
 351                                 case UnitType.Pixel: return "px";
 352                                 case UnitType.Point: return "pt";
 353                                 case UnitType.Pica: return "pc";
 354                                 case UnitType.Inch: return "in";
 355                                 case UnitType.Mm: return "mm";
 356                                 case UnitType.Cm: return "cm";
 357                                 case UnitType.Percentage: return "%";
 358                                 case UnitType.Em: return "em";
 359                                 case UnitType.Ex: return "ex";
 360                                 default: return String.Empty;
 361                         }
 362                 }
 363
 364                 public string ToString (CultureInfo culture)
 365                 {
 366                         if (type == 0)
 367                                 return String.Empty;
 368
 369                         string ex = GetExtension (type);
 370
 371                         return value.ToString (culture) + ex;
 372                 }
 373
 374                 public override string ToString ()
 375                 {
 376                         return ToString (Helpers.InvariantCulture);
 377                 }
 378
 379                 public string ToString (IFormatProvider provider)
 380                 {
 381                         if (type == 0)
 382                                 return String.Empty;
 383
 384                         string ex = GetExtension (type);
 385
 386                         return value.ToString (provider) + ex;
 387                 }
 388         }
 389
 390 }