mcs/class/Mono.Options/Mono.Options/Options.cs

   1 //
   2 // Options.cs
   3 //
   4 // Authors:
   5 //  Jonathan Pryor <jpryor@novell.com>
   6 //  Federico Di Gregorio <fog@initd.org>
   7 //  Rolf Bjarne Kvinge <rolf@xamarin.com>
   8 //
   9 // Copyright (C) 2008 Novell (http://www.novell.com)
  10 // Copyright (C) 2009 Federico Di Gregorio.
  11 // Copyright (C) 2012 Xamarin Inc (http://www.xamarin.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 // Compile With:
  34 //   gmcs -debug+ -r:System.Core Options.cs -o:NDesk.Options.dll
  35 //   gmcs -debug+ -d:LINQ -r:System.Core Options.cs -o:NDesk.Options.dll
  36 //
  37 // The LINQ version just changes the implementation of
  38 // OptionSet.Parse(IEnumerable<string>), and confers no semantic changes.
  39
  40 //
  41 // A Getopt::Long-inspired option parsing library for C#.
  42 //
  43 // NDesk.Options.OptionSet is built upon a key/value table, where the
  44 // key is a option format string and the value is a delegate that is
  45 // invoked when the format string is matched.
  46 //
  47 // Option format strings:
  48 //  Regex-like BNF Grammar:
  49 //    name: .+
  50 //    type: [=:]
  51 //    sep: ( [^{}]+ | '{' .+ '}' )?
  52 //    aliases: ( name type sep ) ( '|' name type sep )*
  53 //
  54 // Each '|'-delimited name is an alias for the associated action.  If the
  55 // format string ends in a '=', it has a required value.  If the format
  56 // string ends in a ':', it has an optional value.  If neither '=' or ':'
  57 // is present, no value is supported.  `=' or `:' need only be defined on one
  58 // alias, but if they are provided on more than one they must be consistent.
  59 //
  60 // Each alias portion may also end with a "key/value separator", which is used
  61 // to split option values if the option accepts > 1 value.  If not specified,
  62 // it defaults to '=' and ':'.  If specified, it can be any character except
  63 // '{' and '}' OR the *string* between '{' and '}'.  If no separator should be
  64 // used (i.e. the separate values should be distinct arguments), then "{}"
  65 // should be used as the separator.
  66 //
  67 // Options are extracted either from the current option by looking for
  68 // the option name followed by an '=' or ':', or is taken from the
  69 // following option IFF:
  70 //  - The current option does not contain a '=' or a ':'
  71 //  - The current option requires a value (i.e. not a Option type of ':')
  72 //
  73 // The `name' used in the option format string does NOT include any leading
  74 // option indicator, such as '-', '--', or '/'.  All three of these are
  75 // permitted/required on any named option.
  76 //
  77 // Option bundling is permitted so long as:
  78 //   - '-' is used to start the option group
  79 //   - all of the bundled options are a single character
  80 //   - at most one of the bundled options accepts a value, and the value
  81 //     provided starts from the next character to the end of the string.
  82 //
  83 // This allows specifying '-a -b -c' as '-abc', and specifying '-D name=value'
  84 // as '-Dname=value'.
  85 //
  86 // Option processing is disabled by specifying "--".  All options after "--"
  87 // are returned by OptionSet.Parse() unchanged and unprocessed.
  88 //
  89 // Unprocessed options are returned from OptionSet.Parse().
  90 //
  91 // Examples:
  92 //  int verbose = 0;
  93 //  OptionSet p = new OptionSet ()
  94 //    .Add ("v", v => ++verbose)
  95 //    .Add ("name=|value=", v => Console.WriteLine (v));
  96 //  p.Parse (new string[]{"-v", "--v", "/v", "-name=A", "/name", "B", "extra"});
  97 //
  98 // The above would parse the argument string array, and would invoke the
  99 // lambda expression three times, setting `verbose' to 3 when complete.
 100 // It would also print out "A" and "B" to standard output.
 101 // The returned array would contain the string "extra".
 102 //
 103 // C# 3.0 collection initializers are supported and encouraged:
 104 //  var p = new OptionSet () {
 105 //    { "h|?|help", v => ShowHelp () },
 106 //  };
 107 //
 108 // System.ComponentModel.TypeConverter is also supported, allowing the use of
 109 // custom data types in the callback type; TypeConverter.ConvertFromString()
 110 // is used to convert the value option to an instance of the specified
 111 // type:
 112 //
 113 //  var p = new OptionSet () {
 114 //    { "foo=", (Foo f) => Console.WriteLine (f.ToString ()) },
 115 //  };
 116 //
 117 // Random other tidbits:
 118 //  - Boolean options (those w/o '=' or ':' in the option format string)
 119 //    are explicitly enabled if they are followed with '+', and explicitly
 120 //    disabled if they are followed with '-':
 121 //      string a = null;
 122 //      var p = new OptionSet () {
 123 //        { "a", s => a = s },
 124 //      };
 125 //      p.Parse (new string[]{"-a"});   // sets v != null
 126 //      p.Parse (new string[]{"-a+"});  // sets v != null
 127 //      p.Parse (new string[]{"-a-"});  // sets v == null
 128 //
 129
 130 using System;
 131 using System.Collections;
 132 using System.Collections.Generic;
 133 using System.Collections.ObjectModel;
 134 using System.ComponentModel;
 135 using System.Globalization;
 136 using System.IO;
 137 using System.Runtime.Serialization;
 138 using System.Security.Permissions;
 139 using System.Text;
 140 using System.Text.RegularExpressions;
 141
 142 #if LINQ
 143 using System.Linq;
 144 #endif
 145
 146 #if TEST
 147 using NDesk.Options;
 148 #endif
 149
 150 #if NDESK_OPTIONS
 151 namespace NDesk.Options
 152 #else
 153 namespace Mono.Options
 154 #endif
 155 {
 156         static class StringCoda {
 157
 158                 public static IEnumerable<string> WrappedLines (string self, params int[] widths)
 159                 {
 160                         IEnumerable<int> w = widths;
 161                         return WrappedLines (self, w);
 162                 }
 163
 164                 public static IEnumerable<string> WrappedLines (string self, IEnumerable<int> widths)
 165                 {
 166                         if (widths == null)
 167                                 throw new ArgumentNullException ("widths");
 168                         return CreateWrappedLinesIterator (self, widths);
 169                 }
 170
 171                 private static IEnumerable<string> CreateWrappedLinesIterator (string self, IEnumerable<int> widths)
 172                 {
 173                         if (string.IsNullOrEmpty (self)) {
 174                                 yield return string.Empty;
 175                                 yield break;
 176                         }
 177                         using (IEnumerator<int> ewidths = widths.GetEnumerator ()) {
 178                                 bool? hw = null;
 179                                 int width = GetNextWidth (ewidths, int.MaxValue, ref hw);
 180                                 int start = 0, end;
 181                                 do {
 182                                         end = GetLineEnd (start, width, self);
 183                                         char c = self [end-1];
 184                                         if (char.IsWhiteSpace (c))
 185                                                 --end;
 186                                         bool needContinuation = end != self.Length && !IsEolChar (c);
 187                                         string continuation = "";
 188                                         if (needContinuation) {
 189                                                 --end;
 190                                                 continuation = "-";
 191                                         }
 192                                         string line = self.Substring (start, end - start) + continuation;
 193                                         yield return line;
 194                                         start = end;
 195                                         if (char.IsWhiteSpace (c))
 196                                                 ++start;
 197                                         width = GetNextWidth (ewidths, width, ref hw);
 198                                 } while (start < self.Length);
 199                         }
 200                 }
 201
 202                 private static int GetNextWidth (IEnumerator<int> ewidths, int curWidth, ref bool? eValid)
 203                 {
 204                         if (!eValid.HasValue || (eValid.HasValue && eValid.Value)) {
 205                                 curWidth = (eValid = ewidths.MoveNext ()).Value ? ewidths.Current : curWidth;
 206                                 // '.' is any character, - is for a continuation
 207                                 const string minWidth = ".-";
 208                                 if (curWidth < minWidth.Length)
 209                                         throw new ArgumentOutOfRangeException ("widths",
 210                                                         string.Format ("Element must be >= {0}, was {1}.", minWidth.Length, curWidth));
 211                                 return curWidth;
 212                         }
 213                         // no more elements, use the last element.
 214                         return curWidth;
 215                 }
 216
 217                 private static bool IsEolChar (char c)
 218                 {
 219                         return !char.IsLetterOrDigit (c);
 220                 }
 221
 222                 private static int GetLineEnd (int start, int length, string description)
 223                 {
 224                         int end = System.Math.Min (start + length, description.Length);
 225                         int sep = -1;
 226                         for (int i = start; i < end; ++i) {
 227                                 if (description [i] == '\n')
 228                                         return i+1;
 229                                 if (IsEolChar (description [i]))
 230                                         sep = i+1;
 231                         }
 232                         if (sep == -1 || end == description.Length)
 233                                 return end;
 234                         return sep;
 235                 }
 236         }
 237
 238         public class OptionValueCollection : IList, IList<string> {
 239
 240                 List<string> values = new List<string> ();
 241                 OptionContext c;
 242
 243                 internal OptionValueCollection (OptionContext c)
 244                 {
 245                         this.c = c;
 246                 }
 247
 248                 #region ICollection
 249                 void ICollection.CopyTo (Array array, int index)  {(values as ICollection).CopyTo (array, index);}
 250                 bool ICollection.IsSynchronized                   {get {return (values as ICollection).IsSynchronized;}}
 251                 object ICollection.SyncRoot                       {get {return (values as ICollection).SyncRoot;}}
 252                 #endregion
 253
 254                 #region ICollection<T>
 255                 public void Add (string item)                       {values.Add (item);}
 256                 public void Clear ()                                {values.Clear ();}
 257                 public bool Contains (string item)                  {return values.Contains (item);}
 258                 public void CopyTo (string[] array, int arrayIndex) {values.CopyTo (array, arrayIndex);}
 259                 public bool Remove (string item)                    {return values.Remove (item);}
 260                 public int Count                                    {get {return values.Count;}}
 261                 public bool IsReadOnly                              {get {return false;}}
 262                 #endregion
 263
 264                 #region IEnumerable
 265                 IEnumerator IEnumerable.GetEnumerator () {return values.GetEnumerator ();}
 266                 #endregion
 267
 268                 #region IEnumerable<T>
 269                 public IEnumerator<string> GetEnumerator () {return values.GetEnumerator ();}
 270                 #endregion
 271
 272                 #region IList
 273                 int IList.Add (object value)                {return (values as IList).Add (value);}
 274                 bool IList.Contains (object value)          {return (values as IList).Contains (value);}
 275                 int IList.IndexOf (object value)            {return (values as IList).IndexOf (value);}
 276                 void IList.Insert (int index, object value) {(values as IList).Insert (index, value);}
 277                 void IList.Remove (object value)            {(values as IList).Remove (value);}
 278                 void IList.RemoveAt (int index)             {(values as IList).RemoveAt (index);}
 279                 bool IList.IsFixedSize                      {get {return false;}}
 280                 object IList.this [int index]               {get {return this [index];} set {(values as IList)[index] = value;}}
 281                 #endregion
 282
 283                 #region IList<T>
 284                 public int IndexOf (string item)            {return values.IndexOf (item);}
 285                 public void Insert (int index, string item) {values.Insert (index, item);}
 286                 public void RemoveAt (int index)            {values.RemoveAt (index);}
 287
 288                 private void AssertValid (int index)
 289                 {
 290                         if (c.Option == null)
 291                                 throw new InvalidOperationException ("OptionContext.Option is null.");
 292                         if (index >= c.Option.MaxValueCount)
 293                                 throw new ArgumentOutOfRangeException ("index");
 294                         if (c.Option.OptionValueType == OptionValueType.Required &&
 295                                         index >= values.Count)
 296                                 throw new OptionException (string.Format (
 297                                                         c.OptionSet.MessageLocalizer ("Missing required value for option '{0}'."), c.OptionName),
 298                                                 c.OptionName);
 299                 }
 300
 301                 public string this [int index] {
 302                         get {
 303                                 AssertValid (index);
 304                                 return index >= values.Count ? null : values [index];
 305                         }
 306                         set {
 307                                 values [index] = value;
 308                         }
 309                 }
 310                 #endregion
 311
 312                 public List<string> ToList ()
 313                 {
 314                         return new List<string> (values);
 315                 }
 316
 317                 public string[] ToArray ()
 318                 {
 319                         return values.ToArray ();
 320                 }
 321
 322                 public override string ToString ()
 323                 {
 324                         return string.Join (", ", values.ToArray ());
 325                 }
 326         }
 327
 328         public class OptionContext {
 329                 private Option                option;
 330                 private string                name;
 331                 private int                   index;
 332                 private OptionSet             set;
 333                 private OptionValueCollection c;
 334
 335                 public OptionContext (OptionSet set)
 336                 {
 337                         this.set = set;
 338                         this.c   = new OptionValueCollection (this);
 339                 }
 340
 341                 public Option Option {
 342                         get {return option;}
 343                         set {option = value;}
 344                 }
 345
 346                 public string OptionName {
 347                         get {return name;}
 348                         set {name = value;}
 349                 }
 350
 351                 public int OptionIndex {
 352                         get {return index;}
 353                         set {index = value;}
 354                 }
 355
 356                 public OptionSet OptionSet {
 357                         get {return set;}
 358                 }
 359
 360                 public OptionValueCollection OptionValues {
 361                         get {return c;}
 362                 }
 363         }
 364
 365         public enum OptionValueType {
 366                 None,
 367                 Optional,
 368                 Required,
 369         }
 370
 371         public abstract class Option {
 372                 string prototype, description;
 373                 string[] names;
 374                 OptionValueType type;
 375                 int count;
 376                 string[] separators;
 377                 bool hidden;
 378
 379                 protected Option (string prototype, string description)
 380                         : this (prototype, description, 1, false)
 381                 {
 382                 }
 383
 384                 protected Option (string prototype, string description, int maxValueCount)
 385                         : this (prototype, description, maxValueCount, false)
 386                 {
 387                 }
 388
 389                 protected Option (string prototype, string description, int maxValueCount, bool hidden)
 390                 {
 391                         if (prototype == null)
 392                                 throw new ArgumentNullException ("prototype");
 393                         if (prototype.Length == 0)
 394                                 throw new ArgumentException ("Cannot be the empty string.", "prototype");
 395                         if (maxValueCount < 0)
 396                                 throw new ArgumentOutOfRangeException ("maxValueCount");
 397
 398                         this.prototype   = prototype;
 399                         this.description = description;
 400                         this.count       = maxValueCount;
 401                         this.names       = (this is OptionSet.Category)
 402                                 // append GetHashCode() so that "duplicate" categories have distinct
 403                                 // names, e.g. adding multiple "" categories should be valid.
 404                                 ? new[]{prototype + this.GetHashCode ()}
 405                                 : prototype.Split ('|');
 406
 407                         if (this is OptionSet.Category)
 408                                 return;
 409
 410                         this.type        = ParsePrototype ();
 411                         this.hidden      = hidden;
 412
 413                         if (this.count == 0 && type != OptionValueType.None)
 414                                 throw new ArgumentException (
 415                                                 "Cannot provide maxValueCount of 0 for OptionValueType.Required or " +
 416                                                         "OptionValueType.Optional.",
 417                                                 "maxValueCount");
 418                         if (this.type == OptionValueType.None && maxValueCount > 1)
 419                                 throw new ArgumentException (
 420                                                 string.Format ("Cannot provide maxValueCount of {0} for OptionValueType.None.", maxValueCount),
 421                                                 "maxValueCount");
 422                         if (Array.IndexOf (names, "<>") >= 0 &&
 423                                         ((names.Length == 1 && this.type != OptionValueType.None) ||
 424                                          (names.Length > 1 && this.MaxValueCount > 1)))
 425                                 throw new ArgumentException (
 426                                                 "The default option handler '<>' cannot require values.",
 427                                                 "prototype");
 428                 }
 429
 430                 public string           Prototype       {get {return prototype;}}
 431                 public string           Description     {get {return description;}}
 432                 public OptionValueType  OptionValueType {get {return type;}}
 433                 public int              MaxValueCount   {get {return count;}}
 434                 public bool             Hidden          {get {return hidden;}}
 435
 436                 public string[] GetNames ()
 437                 {
 438                         return (string[]) names.Clone ();
 439                 }
 440
 441                 public string[] GetValueSeparators ()
 442                 {
 443                         if (separators == null)
 444                                 return new string [0];
 445                         return (string[]) separators.Clone ();
 446                 }
 447
 448                 protected static T Parse<T> (string value, OptionContext c)
 449                 {
 450                         Type tt = typeof (T);
 451                         bool nullable = tt.IsValueType && tt.IsGenericType &&
 452                                 !tt.IsGenericTypeDefinition &&
 453                                 tt.GetGenericTypeDefinition () == typeof (Nullable<>);
 454                         Type targetType = nullable ? tt.GetGenericArguments () [0] : typeof (T);
 455                         TypeConverter conv = TypeDescriptor.GetConverter (targetType);
 456                         T t = default (T);
 457                         try {
 458                                 if (value != null)
 459                                         t = (T) conv.ConvertFromString (value);
 460                         }
 461                         catch (Exception e) {
 462                                 throw new OptionException (
 463                                                 string.Format (
 464                                                         c.OptionSet.MessageLocalizer ("Could not convert string `{0}' to type {1} for option `{2}'."),
 465                                                         value, targetType.Name, c.OptionName),
 466                                                 c.OptionName, e);
 467                         }
 468                         return t;
 469                 }
 470
 471                 internal string[] Names           {get {return names;}}
 472                 internal string[] ValueSeparators {get {return separators;}}
 473
 474                 static readonly char[] NameTerminator = new char[]{'=', ':'};
 475
 476                 private OptionValueType ParsePrototype ()
 477                 {
 478                         char type = '\0';
 479                         List<string> seps = new List<string> ();
 480                         for (int i = 0; i < names.Length; ++i) {
 481                                 string name = names [i];
 482                                 if (name.Length == 0)
 483                                         throw new ArgumentException ("Empty option names are not supported.", "prototype");
 484
 485                                 int end = name.IndexOfAny (NameTerminator);
 486                                 if (end == -1)
 487                                         continue;
 488                                 names [i] = name.Substring (0, end);
 489                                 if (type == '\0' || type == name [end])
 490                                         type = name [end];
 491                                 else
 492                                         throw new ArgumentException (
 493                                                         string.Format ("Conflicting option types: '{0}' vs. '{1}'.", type, name [end]),
 494                                                         "prototype");
 495                                 AddSeparators (name, end, seps);
 496                         }
 497
 498                         if (type == '\0')
 499                                 return OptionValueType.None;
 500
 501                         if (count <= 1 && seps.Count != 0)
 502                                 throw new ArgumentException (
 503                                                 string.Format ("Cannot provide key/value separators for Options taking {0} value(s).", count),
 504                                                 "prototype");
 505                         if (count > 1) {
 506                                 if (seps.Count == 0)
 507                                         this.separators = new string[]{":", "="};
 508                                 else if (seps.Count == 1 && seps [0].Length == 0)
 509                                         this.separators = null;
 510                                 else
 511                                         this.separators = seps.ToArray ();
 512                         }
 513
 514                         return type == '=' ? OptionValueType.Required : OptionValueType.Optional;
 515                 }
 516
 517                 private static void AddSeparators (string name, int end, ICollection<string> seps)
 518                 {
 519                         int start = -1;
 520                         for (int i = end+1; i < name.Length; ++i) {
 521                                 switch (name [i]) {
 522                                         case '{':
 523                                                 if (start != -1)
 524                                                         throw new ArgumentException (
 525                                                                         string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
 526                                                                         "prototype");
 527                                                 start = i+1;
 528                                                 break;
 529                                         case '}':
 530                                                 if (start == -1)
 531                                                         throw new ArgumentException (
 532                                                                         string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
 533                                                                         "prototype");
 534                                                 seps.Add (name.Substring (start, i-start));
 535                                                 start = -1;
 536                                                 break;
 537                                         default:
 538                                                 if (start == -1)
 539                                                         seps.Add (name [i].ToString ());
 540                                                 break;
 541                                 }
 542                         }
 543                         if (start != -1)
 544                                 throw new ArgumentException (
 545                                                 string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
 546                                                 "prototype");
 547                 }
 548
 549                 public void Invoke (OptionContext c)
 550                 {
 551                         OnParseComplete (c);
 552                         c.OptionName  = null;
 553                         c.Option      = null;
 554                         c.OptionValues.Clear ();
 555                 }
 556
 557                 protected abstract void OnParseComplete (OptionContext c);
 558
 559                 public override string ToString ()
 560                 {
 561                         return Prototype;
 562                 }
 563         }
 564
 565         public abstract class ArgumentSource {
 566
 567                 protected ArgumentSource ()
 568                 {
 569                 }
 570
 571                 public abstract string[] GetNames ();
 572                 public abstract string Description { get; }
 573                 public abstract bool GetArguments (string value, out IEnumerable<string> replacement);
 574
 575                 public static IEnumerable<string> GetArgumentsFromFile (string file)
 576                 {
 577                         return GetArguments (File.OpenText (file), true);
 578                 }
 579
 580                 public static IEnumerable<string> GetArguments (TextReader reader)
 581                 {
 582                         return GetArguments (reader, false);
 583                 }
 584
 585                 // Cribbed from mcs/driver.cs:LoadArgs(string)
 586                 static IEnumerable<string> GetArguments (TextReader reader, bool close)
 587                 {
 588                         try {
 589                                 StringBuilder arg = new StringBuilder ();
 590
 591                                 string line;
 592                                 while ((line = reader.ReadLine ()) != null) {
 593                                         int t = line.Length;
 594
 595                                         for (int i = 0; i < t; i++) {
 596                                                 char c = line [i];
 597
 598                                                 if (c == '"' || c == '\'') {
 599                                                         char end = c;
 600
 601                                                         for (i++; i < t; i++){
 602                                                                 c = line [i];
 603
 604                                                                 if (c == end)
 605                                                                         break;
 606                                                                 arg.Append (c);
 607                                                         }
 608                                                 } else if (c == ' ') {
 609                                                         if (arg.Length > 0) {
 610                                                                 yield return arg.ToString ();
 611                                                                 arg.Length = 0;
 612                                                         }
 613                                                 } else
 614                                                         arg.Append (c);
 615                                         }
 616                                         if (arg.Length > 0) {
 617                                                 yield return arg.ToString ();
 618                                                 arg.Length = 0;
 619                                         }
 620                                 }
 621                         }
 622                         finally {
 623                                 if (close)
 624                                         reader.Close ();
 625                         }
 626                 }
 627         }
 628
 629         public class ResponseFileSource : ArgumentSource {
 630
 631                 public override string[] GetNames ()
 632                 {
 633                         return new string[]{"@file"};
 634                 }
 635
 636                 public override string Description {
 637                         get {return "Read response file for more options.";}
 638                 }
 639
 640                 public override bool GetArguments (string value, out IEnumerable<string> replacement)
 641                 {
 642                         if (string.IsNullOrEmpty (value) || !value.StartsWith ("@")) {
 643                                 replacement = null;
 644                                 return false;
 645                         }
 646                         replacement = ArgumentSource.GetArgumentsFromFile (value.Substring (1));
 647                         return true;
 648                 }
 649         }
 650
 651         [Serializable]
 652         public class OptionException : Exception {
 653                 private string option;
 654
 655                 public OptionException ()
 656                 {
 657                 }
 658
 659                 public OptionException (string message, string optionName)
 660                         : base (message)
 661                 {
 662                         this.option = optionName;
 663                 }
 664
 665                 public OptionException (string message, string optionName, Exception innerException)
 666                         : base (message, innerException)
 667                 {
 668                         this.option = optionName;
 669                 }
 670
 671                 protected OptionException (SerializationInfo info, StreamingContext context)
 672                         : base (info, context)
 673                 {
 674                         this.option = info.GetString ("OptionName");
 675                 }
 676
 677                 public string OptionName {
 678                         get {return this.option;}
 679                 }
 680
 681                 [SecurityPermission (SecurityAction.LinkDemand, SerializationFormatter = true)]
 682                 public override void GetObjectData (SerializationInfo info, StreamingContext context)
 683                 {
 684                         base.GetObjectData (info, context);
 685                         info.AddValue ("OptionName", option);
 686                 }
 687         }
 688
 689         public delegate void OptionAction<TKey, TValue> (TKey key, TValue value);
 690
 691         public class OptionSet : KeyedCollection<string, Option>
 692         {
 693                 public OptionSet ()
 694                         : this (delegate (string f) {return f;})
 695                 {
 696                 }
 697
 698                 public OptionSet (Converter<string, string> localizer)
 699                 {
 700                         this.localizer = localizer;
 701                         this.roSources = new ReadOnlyCollection<ArgumentSource>(sources);
 702                 }
 703
 704                 Converter<string, string> localizer;
 705
 706                 public Converter<string, string> MessageLocalizer {
 707                         get {return localizer;}
 708                 }
 709
 710                 List<ArgumentSource> sources = new List<ArgumentSource> ();
 711                 ReadOnlyCollection<ArgumentSource> roSources;
 712
 713                 public ReadOnlyCollection<ArgumentSource> ArgumentSources {
 714                         get {return roSources;}
 715                 }
 716
 717
 718                 protected override string GetKeyForItem (Option item)
 719                 {
 720                         if (item == null)
 721                                 throw new ArgumentNullException ("option");
 722                         if (item.Names != null && item.Names.Length > 0)
 723                                 return item.Names [0];
 724                         // This should never happen, as it's invalid for Option to be
 725                         // constructed w/o any names.
 726                         throw new InvalidOperationException ("Option has no names!");
 727                 }
 728
 729                 [Obsolete ("Use KeyedCollection.this[string]")]
 730                 protected Option GetOptionForName (string option)
 731                 {
 732                         if (option == null)
 733                                 throw new ArgumentNullException ("option");
 734                         try {
 735                                 return base [option];
 736                         }
 737                         catch (KeyNotFoundException) {
 738                                 return null;
 739                         }
 740                 }
 741
 742                 protected override void InsertItem (int index, Option item)
 743                 {
 744                         base.InsertItem (index, item);
 745                         AddImpl (item);
 746                 }
 747
 748                 protected override void RemoveItem (int index)
 749                 {
 750                         Option p = Items [index];
 751                         base.RemoveItem (index);
 752                         // KeyedCollection.RemoveItem() handles the 0th item
 753                         for (int i = 1; i < p.Names.Length; ++i) {
 754                                 Dictionary.Remove (p.Names [i]);
 755                         }
 756                 }
 757
 758                 protected override void SetItem (int index, Option item)
 759                 {
 760                         base.SetItem (index, item);
 761                         AddImpl (item);
 762                 }
 763
 764                 private void AddImpl (Option option)
 765                 {
 766                         if (option == null)
 767                                 throw new ArgumentNullException ("option");
 768                         List<string> added = new List<string> (option.Names.Length);
 769                         try {
 770                                 // KeyedCollection.InsertItem/SetItem handle the 0th name.
 771                                 for (int i = 1; i < option.Names.Length; ++i) {
 772                                         Dictionary.Add (option.Names [i], option);
 773                                         added.Add (option.Names [i]);
 774                                 }
 775                         }
 776                         catch (Exception) {
 777                                 foreach (string name in added)
 778                                         Dictionary.Remove (name);
 779                                 throw;
 780                         }
 781                 }
 782
 783                 public OptionSet Add (string header)
 784                 {
 785                         if (header == null)
 786                                 throw new ArgumentNullException ("header");
 787                         Add (new Category (header));
 788                         return this;
 789                 }
 790
 791                 internal sealed class Category : Option {
 792
 793                         // Prototype starts with '=' because this is an invalid prototype
 794                         // (see Option.ParsePrototype(), and thus it'll prevent Category
 795                         // instances from being accidentally used as normal options.
 796                         public Category (string description)
 797                                 : base ("=:Category:= " + description, description)
 798                         {
 799                         }
 800
 801                         protected override void OnParseComplete (OptionContext c)
 802                         {
 803                                 throw new NotSupportedException ("Category.OnParseComplete should not be invoked.");
 804                         }
 805                 }
 806
 807
 808                 public new OptionSet Add (Option option)
 809                 {
 810                         base.Add (option);
 811                         return this;
 812                 }
 813
 814                 sealed class ActionOption : Option {
 815                         Action<OptionValueCollection> action;
 816
 817                         public ActionOption (string prototype, string description, int count, Action<OptionValueCollection> action)
 818                                 : this (prototype, description, count, action, false)
 819                         {
 820                         }
 821
 822                         public ActionOption (string prototype, string description, int count, Action<OptionValueCollection> action, bool hidden)
 823                                 : base (prototype, description, count, hidden)
 824                         {
 825                                 if (action == null)
 826                                         throw new ArgumentNullException ("action");
 827                                 this.action = action;
 828                         }
 829
 830                         protected override void OnParseComplete (OptionContext c)
 831                         {
 832                                 action (c.OptionValues);
 833                         }
 834                 }
 835
 836                 public OptionSet Add (string prototype, Action<string> action)
 837                 {
 838                         return Add (prototype, null, action);
 839                 }
 840
 841                 public OptionSet Add (string prototype, string description, Action<string> action)
 842                 {
 843                         return Add (prototype, description, action, false);
 844                 }
 845
 846                 public OptionSet Add (string prototype, string description, Action<string> action, bool hidden)
 847                 {
 848                         if (action == null)
 849                                 throw new ArgumentNullException ("action");
 850                         Option p = new ActionOption (prototype, description, 1,
 851                                         delegate (OptionValueCollection v) { action (v [0]); }, hidden);
 852                         base.Add (p);
 853                         return this;
 854                 }
 855
 856                 public OptionSet Add (string prototype, OptionAction<string, string> action)
 857                 {
 858                         return Add (prototype, null, action);
 859                 }
 860
 861                 public OptionSet Add (string prototype, string description, OptionAction<string, string> action)
 862                 {
 863                         return Add (prototype, description, action, false);
 864                 }
 865
 866                 public OptionSet Add (string prototype, string description, OptionAction<string, string> action, bool hidden)   {
 867                         if (action == null)
 868                                 throw new ArgumentNullException ("action");
 869                         Option p = new ActionOption (prototype, description, 2,
 870                                         delegate (OptionValueCollection v) {action (v [0], v [1]);}, hidden);
 871                         base.Add (p);
 872                         return this;
 873                 }
 874
 875                 sealed class ActionOption<T> : Option {
 876                         Action<T> action;
 877
 878                         public ActionOption (string prototype, string description, Action<T> action)
 879                                 : base (prototype, description, 1)
 880                         {
 881                                 if (action == null)
 882                                         throw new ArgumentNullException ("action");
 883                                 this.action = action;
 884                         }
 885
 886                         protected override void OnParseComplete (OptionContext c)
 887                         {
 888                                 action (Parse<T> (c.OptionValues [0], c));
 889                         }
 890                 }
 891
 892                 sealed class ActionOption<TKey, TValue> : Option {
 893                         OptionAction<TKey, TValue> action;
 894
 895                         public ActionOption (string prototype, string description, OptionAction<TKey, TValue> action)
 896                                 : base (prototype, description, 2)
 897                         {
 898                                 if (action == null)
 899                                         throw new ArgumentNullException ("action");
 900                                 this.action = action;
 901                         }
 902
 903                         protected override void OnParseComplete (OptionContext c)
 904                         {
 905                                 action (
 906                                                 Parse<TKey> (c.OptionValues [0], c),
 907                                                 Parse<TValue> (c.OptionValues [1], c));
 908                         }
 909                 }
 910
 911                 public OptionSet Add<T> (string prototype, Action<T> action)
 912                 {
 913                         return Add (prototype, null, action);
 914                 }
 915
 916                 public OptionSet Add<T> (string prototype, string description, Action<T> action)
 917                 {
 918                         return Add (new ActionOption<T> (prototype, description, action));
 919                 }
 920
 921                 public OptionSet Add<TKey, TValue> (string prototype, OptionAction<TKey, TValue> action)
 922                 {
 923                         return Add (prototype, null, action);
 924                 }
 925
 926                 public OptionSet Add<TKey, TValue> (string prototype, string description, OptionAction<TKey, TValue> action)
 927                 {
 928                         return Add (new ActionOption<TKey, TValue> (prototype, description, action));
 929                 }
 930
 931                 public OptionSet Add (ArgumentSource source)
 932                 {
 933                         if (source == null)
 934                                 throw new ArgumentNullException ("source");
 935                         sources.Add (source);
 936                         return this;
 937                 }
 938
 939                 protected virtual OptionContext CreateOptionContext ()
 940                 {
 941                         return new OptionContext (this);
 942                 }
 943
 944                 public List<string> Parse (IEnumerable<string> arguments)
 945                 {
 946                         if (arguments == null)
 947                                 throw new ArgumentNullException ("arguments");
 948                         OptionContext c = CreateOptionContext ();
 949                         c.OptionIndex = -1;
 950                         bool process = true;
 951                         List<string> unprocessed = new List<string> ();
 952                         Option def = Contains ("<>") ? this ["<>"] : null;
 953                         ArgumentEnumerator ae = new ArgumentEnumerator (arguments);
 954                         foreach (string argument in ae) {
 955                                 ++c.OptionIndex;
 956                                 if (argument == "--") {
 957                                         process = false;
 958                                         continue;
 959                                 }
 960                                 if (!process) {
 961                                         Unprocessed (unprocessed, def, c, argument);
 962                                         continue;
 963                                 }
 964                                 if (AddSource (ae, argument))
 965                                         continue;
 966                                 if (!Parse (argument, c))
 967                                         Unprocessed (unprocessed, def, c, argument);
 968                         }
 969                         if (c.Option != null)
 970                                 c.Option.Invoke (c);
 971                         return unprocessed;
 972                 }
 973
 974                 class ArgumentEnumerator : IEnumerable<string> {
 975                         List<IEnumerator<string>> sources = new List<IEnumerator<string>> ();
 976
 977                         public ArgumentEnumerator (IEnumerable<string> arguments)
 978                         {
 979                                 sources.Add (arguments.GetEnumerator ());
 980                         }
 981
 982                         public void Add (IEnumerable<string> arguments)
 983                         {
 984                                 sources.Add (arguments.GetEnumerator ());
 985                         }
 986
 987                         public IEnumerator<string> GetEnumerator ()
 988                         {
 989                                 do {
 990                                         IEnumerator<string> c = sources [sources.Count-1];
 991                                         if (c.MoveNext ())
 992                                                 yield return c.Current;
 993                                         else {
 994                                                 c.Dispose ();
 995                                                 sources.RemoveAt (sources.Count-1);
 996                                         }
 997                                 } while (sources.Count > 0);
 998                         }
 999
1000                         IEnumerator IEnumerable.GetEnumerator ()
1001                         {
1002                                 return GetEnumerator ();
1003                         }
1004                 }
1005
1006                 bool AddSource (ArgumentEnumerator ae, string argument)
1007                 {
1008                         foreach (ArgumentSource source in sources) {
1009                                 IEnumerable<string> replacement;
1010                                 if (!source.GetArguments (argument, out replacement))
1011                                         continue;
1012                                 ae.Add (replacement);
1013                                 return true;
1014                         }
1015                         return false;
1016                 }
1017
1018                 private static bool Unprocessed (ICollection<string> extra, Option def, OptionContext c, string argument)
1019                 {
1020                         if (def == null) {
1021                                 extra.Add (argument);
1022                                 return false;
1023                         }
1024                         c.OptionValues.Add (argument);
1025                         c.Option = def;
1026                         c.Option.Invoke (c);
1027                         return false;
1028                 }
1029
1030                 private readonly Regex ValueOption = new Regex (
1031                         @"^(?<flag>--|-|/)(?<name>[^:=]+)((?<sep>[:=])(?<value>.*))?$");
1032
1033                 protected bool GetOptionParts (string argument, out string flag, out string name, out string sep, out string value)
1034                 {
1035                         if (argument == null)
1036                                 throw new ArgumentNullException ("argument");
1037
1038                         flag = name = sep = value = null;
1039                         Match m = ValueOption.Match (argument);
1040                         if (!m.Success) {
1041                                 return false;
1042                         }
1043                         flag  = m.Groups ["flag"].Value;
1044                         name  = m.Groups ["name"].Value;
1045                         if (m.Groups ["sep"].Success && m.Groups ["value"].Success) {
1046                                 sep   = m.Groups ["sep"].Value;
1047                                 value = m.Groups ["value"].Value;
1048                         }
1049                         return true;
1050                 }
1051
1052                 protected virtual bool Parse (string argument, OptionContext c)
1053                 {
1054                         if (c.Option != null) {
1055                                 ParseValue (argument, c);
1056                                 return true;
1057                         }
1058
1059                         string f, n, s, v;
1060                         if (!GetOptionParts (argument, out f, out n, out s, out v))
1061                                 return false;
1062
1063                         Option p;
1064                         if (Contains (n)) {
1065                                 p = this [n];
1066                                 c.OptionName = f + n;
1067                                 c.Option     = p;
1068                                 switch (p.OptionValueType) {
1069                                         case OptionValueType.None:
1070                                                 c.OptionValues.Add (n);
1071                                                 c.Option.Invoke (c);
1072                                                 break;
1073                                         case OptionValueType.Optional:
1074                                         case OptionValueType.Required:
1075                                                 ParseValue (v, c);
1076                                                 break;
1077                                 }
1078                                 return true;
1079                         }
1080                         // no match; is it a bool option?
1081                         if (ParseBool (argument, n, c))
1082                                 return true;
1083                         // is it a bundled option?
1084                         if (ParseBundledValue (f, string.Concat (n + s + v), c))
1085                                 return true;
1086
1087                         return false;
1088                 }
1089
1090                 private void ParseValue (string option, OptionContext c)
1091                 {
1092                         if (option != null)
1093                                 foreach (string o in c.Option.ValueSeparators != null
1094                                                 ? option.Split (c.Option.ValueSeparators, c.Option.MaxValueCount - c.OptionValues.Count, StringSplitOptions.None)
1095                                                 : new string[]{option}) {
1096                                         c.OptionValues.Add (o);
1097                                 }
1098                         if (c.OptionValues.Count == c.Option.MaxValueCount ||
1099                                         c.Option.OptionValueType == OptionValueType.Optional)
1100                                 c.Option.Invoke (c);
1101                         else if (c.OptionValues.Count > c.Option.MaxValueCount) {
1102                                 throw new OptionException (localizer (string.Format (
1103                                                                 "Error: Found {0} option values when expecting {1}.",
1104                                                                 c.OptionValues.Count, c.Option.MaxValueCount)),
1105                                                 c.OptionName);
1106                         }
1107                 }
1108
1109                 private bool ParseBool (string option, string n, OptionContext c)
1110                 {
1111                         Option p;
1112                         string rn;
1113                         if (n.Length >= 1 && (n [n.Length-1] == '+' || n [n.Length-1] == '-') &&
1114                                         Contains ((rn = n.Substring (0, n.Length-1)))) {
1115                                 p = this [rn];
1116                                 string v = n [n.Length-1] == '+' ? option : null;
1117                                 c.OptionName  = option;
1118                                 c.Option      = p;
1119                                 c.OptionValues.Add (v);
1120                                 p.Invoke (c);
1121                                 return true;
1122                         }
1123                         return false;
1124                 }
1125
1126                 private bool ParseBundledValue (string f, string n, OptionContext c)
1127                 {
1128                         if (f != "-")
1129                                 return false;
1130                         for (int i = 0; i < n.Length; ++i) {
1131                                 Option p;
1132                                 string opt = f + n [i].ToString ();
1133                                 string rn = n [i].ToString ();
1134                                 if (!Contains (rn)) {
1135                                         if (i == 0)
1136                                                 return false;
1137                                         throw new OptionException (string.Format (localizer (
1138                                                                         "Cannot bundle unregistered option '{0}'."), opt), opt);
1139                                 }
1140                                 p = this [rn];
1141                                 switch (p.OptionValueType) {
1142                                         case OptionValueType.None:
1143                                                 Invoke (c, opt, n, p);
1144                                                 break;
1145                                         case OptionValueType.Optional:
1146                                         case OptionValueType.Required: {
1147                                                 string v     = n.Substring (i+1);
1148                                                 c.Option     = p;
1149                                                 c.OptionName = opt;
1150                                                 ParseValue (v.Length != 0 ? v : null, c);
1151                                                 return true;
1152                                         }
1153                                         default:
1154                                                 throw new InvalidOperationException ("Unknown OptionValueType: " + p.OptionValueType);
1155                                 }
1156                         }
1157                         return true;
1158                 }
1159
1160                 private static void Invoke (OptionContext c, string name, string value, Option option)
1161                 {
1162                         c.OptionName  = name;
1163                         c.Option      = option;
1164                         c.OptionValues.Add (value);
1165                         option.Invoke (c);
1166                 }
1167
1168                 private const int OptionWidth = 29;
1169                 private const int Description_FirstWidth  = 80 - OptionWidth;
1170                 private const int Description_RemWidth    = 80 - OptionWidth - 2;
1171
1172                 public void WriteOptionDescriptions (TextWriter o)
1173                 {
1174                         foreach (Option p in this) {
1175                                 int written = 0;
1176
1177                                 if (p.Hidden)
1178                                         continue;
1179
1180                                 Category c = p as Category;
1181                                 if (c != null) {
1182                                         WriteDescription (o, p.Description, "", 80, 80);
1183                                         continue;
1184                                 }
1185
1186                                 if (!WriteOptionPrototype (o, p, ref written))
1187                                         continue;
1188
1189                                 if (written < OptionWidth)
1190                                         o.Write (new string (' ', OptionWidth - written));
1191                                 else {
1192                                         o.WriteLine ();
1193                                         o.Write (new string (' ', OptionWidth));
1194                                 }
1195
1196                                 WriteDescription (o, p.Description, new string (' ', OptionWidth+2),
1197                                                 Description_FirstWidth, Description_RemWidth);
1198                         }
1199
1200                         foreach (ArgumentSource s in sources) {
1201                                 string[] names = s.GetNames ();
1202                                 if (names == null || names.Length == 0)
1203                                         continue;
1204
1205                                 int written = 0;
1206
1207                                 Write (o, ref written, "  ");
1208                                 Write (o, ref written, names [0]);
1209                                 for (int i = 1; i < names.Length; ++i) {
1210                                         Write (o, ref written, ", ");
1211                                         Write (o, ref written, names [i]);
1212                                 }
1213
1214                                 if (written < OptionWidth)
1215                                         o.Write (new string (' ', OptionWidth - written));
1216                                 else {
1217                                         o.WriteLine ();
1218                                         o.Write (new string (' ', OptionWidth));
1219                                 }
1220
1221                                 WriteDescription (o, s.Description, new string (' ', OptionWidth+2),
1222                                                 Description_FirstWidth, Description_RemWidth);
1223                         }
1224                 }
1225
1226                 void WriteDescription (TextWriter o, string value, string prefix, int firstWidth, int remWidth)
1227                 {
1228                         bool indent = false;
1229                         foreach (string line in GetLines (localizer (GetDescription (value)), firstWidth, remWidth)) {
1230                                 if (indent)
1231                                         o.Write (prefix);
1232                                 o.WriteLine (line);
1233                                 indent = true;
1234                         }
1235                 }
1236
1237                 bool WriteOptionPrototype (TextWriter o, Option p, ref int written)
1238                 {
1239                         string[] names = p.Names;
1240
1241                         int i = GetNextOptionIndex (names, 0);
1242                         if (i == names.Length)
1243                                 return false;
1244
1245                         if (names [i].Length == 1) {
1246                                 Write (o, ref written, "  -");
1247                                 Write (o, ref written, names [0]);
1248                         }
1249                         else {
1250                                 Write (o, ref written, "      --");
1251                                 Write (o, ref written, names [0]);
1252                         }
1253
1254                         for ( i = GetNextOptionIndex (names, i+1);
1255                                         i < names.Length; i = GetNextOptionIndex (names, i+1)) {
1256                                 Write (o, ref written, ", ");
1257                                 Write (o, ref written, names [i].Length == 1 ? "-" : "--");
1258                                 Write (o, ref written, names [i]);
1259                         }
1260
1261                         if (p.OptionValueType == OptionValueType.Optional ||
1262                                         p.OptionValueType == OptionValueType.Required) {
1263                                 if (p.OptionValueType == OptionValueType.Optional) {
1264                                         Write (o, ref written, localizer ("["));
1265                                 }
1266                                 Write (o, ref written, localizer ("=" + GetArgumentName (0, p.MaxValueCount, p.Description)));
1267                                 string sep = p.ValueSeparators != null && p.ValueSeparators.Length > 0
1268                                         ? p.ValueSeparators [0]
1269                                         : " ";
1270                                 for (int c = 1; c < p.MaxValueCount; ++c) {
1271                                         Write (o, ref written, localizer (sep + GetArgumentName (c, p.MaxValueCount, p.Description)));
1272                                 }
1273                                 if (p.OptionValueType == OptionValueType.Optional) {
1274                                         Write (o, ref written, localizer ("]"));
1275                                 }
1276                         }
1277                         return true;
1278                 }
1279
1280                 static int GetNextOptionIndex (string[] names, int i)
1281                 {
1282                         while (i < names.Length && names [i] == "<>") {
1283                                 ++i;
1284                         }
1285                         return i;
1286                 }
1287
1288                 static void Write (TextWriter o, ref int n, string s)
1289                 {
1290                         n += s.Length;
1291                         o.Write (s);
1292                 }
1293
1294                 private static string GetArgumentName (int index, int maxIndex, string description)
1295                 {
1296                         if (description == null)
1297                                 return maxIndex == 1 ? "VALUE" : "VALUE" + (index + 1);
1298                         string[] nameStart;
1299                         if (maxIndex == 1)
1300                                 nameStart = new string[]{"{0:", "{"};
1301                         else
1302                                 nameStart = new string[]{"{" + index + ":"};
1303                         for (int i = 0; i < nameStart.Length; ++i) {
1304                                 int start, j = 0;
1305                                 do {
1306                                         start = description.IndexOf (nameStart [i], j);
1307                                 } while (start >= 0 && j != 0 ? description [j++ - 1] == '{' : false);
1308                                 if (start == -1)
1309                                         continue;
1310                                 int end = description.IndexOf ("}", start);
1311                                 if (end == -1)
1312                                         continue;
1313                                 return description.Substring (start + nameStart [i].Length, end - start - nameStart [i].Length);
1314                         }
1315                         return maxIndex == 1 ? "VALUE" : "VALUE" + (index + 1);
1316                 }
1317
1318                 private static string GetDescription (string description)
1319                 {
1320                         if (description == null)
1321                                 return string.Empty;
1322                         StringBuilder sb = new StringBuilder (description.Length);
1323                         int start = -1;
1324                         for (int i = 0; i < description.Length; ++i) {
1325                                 switch (description [i]) {
1326                                         case '{':
1327                                                 if (i == start) {
1328                                                         sb.Append ('{');
1329                                                         start = -1;
1330                                                 }
1331                                                 else if (start < 0)
1332                                                         start = i + 1;
1333                                                 break;
1334                                         case '}':
1335                                                 if (start < 0) {
1336                                                         if ((i+1) == description.Length || description [i+1] != '}')
1337                                                                 throw new InvalidOperationException ("Invalid option description: " + description);
1338                                                         ++i;
1339                                                         sb.Append ("}");
1340                                                 }
1341                                                 else {
1342                                                         sb.Append (description.Substring (start, i - start));
1343                                                         start = -1;
1344                                                 }
1345                                                 break;
1346                                         case ':':
1347                                                 if (start < 0)
1348                                                         goto default;
1349                                                 start = i + 1;
1350                                                 break;
1351                                         default:
1352                                                 if (start < 0)
1353                                                         sb.Append (description [i]);
1354                                                 break;
1355                                 }
1356                         }
1357                         return sb.ToString ();
1358                 }
1359
1360                 private static IEnumerable<string> GetLines (string description, int firstWidth, int remWidth)
1361                 {
1362                         return StringCoda.WrappedLines (description, firstWidth, remWidth);
1363                 }
1364         }
1365 }
1366