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 #if PCL
 139 using System.Reflection;
 140 #else
 141 using System.Security.Permissions;
 142 #endif
 143 using System.Text;
 144 using System.Text.RegularExpressions;
 145
 146 #if LINQ
 147 using System.Linq;
 148 #endif
 149
 150 #if TEST
 151 using NDesk.Options;
 152 #endif
 153
 154 #if PCL
 155 using MessageLocalizerConverter = System.Func<string, string>;
 156 #else
 157 using MessageLocalizerConverter = System.Converter<string, string>;
 158 #endif
 159
 160 #if NDESK_OPTIONS
 161 namespace NDesk.Options
 162 #else
 163 namespace Mono.Options
 164 #endif
 165 {
 166         static class StringCoda {
 167
 168                 public static IEnumerable<string> WrappedLines (string self, params int[] widths)
 169                 {
 170                         IEnumerable<int> w = widths;
 171                         return WrappedLines (self, w);
 172                 }
 173
 174                 public static IEnumerable<string> WrappedLines (string self, IEnumerable<int> widths)
 175                 {
 176                         if (widths == null)
 177                                 throw new ArgumentNullException ("widths");
 178                         return CreateWrappedLinesIterator (self, widths);
 179                 }
 180
 181                 private static IEnumerable<string> CreateWrappedLinesIterator (string self, IEnumerable<int> widths)
 182                 {
 183                         if (string.IsNullOrEmpty (self)) {
 184                                 yield return string.Empty;
 185                                 yield break;
 186                         }
 187                         using (IEnumerator<int> ewidths = widths.GetEnumerator ()) {
 188                                 bool? hw = null;
 189                                 int width = GetNextWidth (ewidths, int.MaxValue, ref hw);
 190                                 int start = 0, end;
 191                                 do {
 192                                         end = GetLineEnd (start, width, self);
 193                                         char c = self [end-1];
 194                                         if (char.IsWhiteSpace (c))
 195                                                 --end;
 196                                         bool needContinuation = end != self.Length && !IsEolChar (c);
 197                                         string continuation = "";
 198                                         if (needContinuation) {
 199                                                 --end;
 200                                                 continuation = "-";
 201                                         }
 202                                         string line = self.Substring (start, end - start) + continuation;
 203                                         yield return line;
 204                                         start = end;
 205                                         if (char.IsWhiteSpace (c))
 206                                                 ++start;
 207                                         width = GetNextWidth (ewidths, width, ref hw);
 208                                 } while (start < self.Length);
 209                         }
 210                 }
 211
 212                 private static int GetNextWidth (IEnumerator<int> ewidths, int curWidth, ref bool? eValid)
 213                 {
 214                         if (!eValid.HasValue || (eValid.HasValue && eValid.Value)) {
 215                                 curWidth = (eValid = ewidths.MoveNext ()).Value ? ewidths.Current : curWidth;
 216                                 // '.' is any character, - is for a continuation
 217                                 const string minWidth = ".-";
 218                                 if (curWidth < minWidth.Length)
 219                                         throw new ArgumentOutOfRangeException ("widths",
 220                                                         string.Format ("Element must be >= {0}, was {1}.", minWidth.Length, curWidth));
 221                                 return curWidth;
 222                         }
 223                         // no more elements, use the last element.
 224                         return curWidth;
 225                 }
 226
 227                 private static bool IsEolChar (char c)
 228                 {
 229                         return !char.IsLetterOrDigit (c);
 230                 }
 231
 232                 private static int GetLineEnd (int start, int length, string description)
 233                 {
 234                         int end = System.Math.Min (start + length, description.Length);
 235                         int sep = -1;
 236                         for (int i = start; i < end; ++i) {
 237                                 if (description [i] == '\n')
 238                                         return i+1;
 239                                 if (IsEolChar (description [i]))
 240                                         sep = i+1;
 241                         }
 242                         if (sep == -1 || end == description.Length)
 243                                 return end;
 244                         return sep;
 245                 }
 246         }
 247
 248         public class OptionValueCollection : IList, IList<string> {
 249
 250                 List<string> values = new List<string> ();
 251                 OptionContext c;
 252
 253                 internal OptionValueCollection (OptionContext c)
 254                 {
 255                         this.c = c;
 256                 }
 257
 258                 #region ICollection
 259                 void ICollection.CopyTo (Array array, int index)  {(values as ICollection).CopyTo (array, index);}
 260                 bool ICollection.IsSynchronized                   {get {return (values as ICollection).IsSynchronized;}}
 261                 object ICollection.SyncRoot                       {get {return (values as ICollection).SyncRoot;}}
 262                 #endregion
 263
 264                 #region ICollection<T>
 265                 public void Add (string item)                       {values.Add (item);}
 266                 public void Clear ()                                {values.Clear ();}
 267                 public bool Contains (string item)                  {return values.Contains (item);}
 268                 public void CopyTo (string[] array, int arrayIndex) {values.CopyTo (array, arrayIndex);}
 269                 public bool Remove (string item)                    {return values.Remove (item);}
 270                 public int Count                                    {get {return values.Count;}}
 271                 public bool IsReadOnly                              {get {return false;}}
 272                 #endregion
 273
 274                 #region IEnumerable
 275                 IEnumerator IEnumerable.GetEnumerator () {return values.GetEnumerator ();}
 276                 #endregion
 277
 278                 #region IEnumerable<T>
 279                 public IEnumerator<string> GetEnumerator () {return values.GetEnumerator ();}
 280                 #endregion
 281
 282                 #region IList
 283                 int IList.Add (object value)                {return (values as IList).Add (value);}
 284                 bool IList.Contains (object value)          {return (values as IList).Contains (value);}
 285                 int IList.IndexOf (object value)            {return (values as IList).IndexOf (value);}
 286                 void IList.Insert (int index, object value) {(values as IList).Insert (index, value);}
 287                 void IList.Remove (object value)            {(values as IList).Remove (value);}
 288                 void IList.RemoveAt (int index)             {(values as IList).RemoveAt (index);}
 289                 bool IList.IsFixedSize                      {get {return false;}}
 290                 object IList.this [int index]               {get {return this [index];} set {(values as IList)[index] = value;}}
 291                 #endregion
 292
 293                 #region IList<T>
 294                 public int IndexOf (string item)            {return values.IndexOf (item);}
 295                 public void Insert (int index, string item) {values.Insert (index, item);}
 296                 public void RemoveAt (int index)            {values.RemoveAt (index);}
 297
 298                 private void AssertValid (int index)
 299                 {
 300                         if (c.Option == null)
 301                                 throw new InvalidOperationException ("OptionContext.Option is null.");
 302                         if (index >= c.Option.MaxValueCount)
 303                                 throw new ArgumentOutOfRangeException ("index");
 304                         if (c.Option.OptionValueType == OptionValueType.Required &&
 305                                         index >= values.Count)
 306                                 throw new OptionException (string.Format (
 307                                                         c.OptionSet.MessageLocalizer ("Missing required value for option '{0}'."), c.OptionName),
 308                                                 c.OptionName);
 309                 }
 310
 311                 public string this [int index] {
 312                         get {
 313                                 AssertValid (index);
 314                                 return index >= values.Count ? null : values [index];
 315                         }
 316                         set {
 317                                 values [index] = value;
 318                         }
 319                 }
 320                 #endregion
 321
 322                 public List<string> ToList ()
 323                 {
 324                         return new List<string> (values);
 325                 }
 326
 327                 public string[] ToArray ()
 328                 {
 329                         return values.ToArray ();
 330                 }
 331
 332                 public override string ToString ()
 333                 {
 334                         return string.Join (", ", values.ToArray ());
 335                 }
 336         }
 337
 338         public class OptionContext {
 339                 private Option                option;
 340                 private string                name;
 341                 private int                   index;
 342                 private OptionSet             set;
 343                 private OptionValueCollection c;
 344
 345                 public OptionContext (OptionSet set)
 346                 {
 347                         this.set = set;
 348                         this.c   = new OptionValueCollection (this);
 349                 }
 350
 351                 public Option Option {
 352                         get {return option;}
 353                         set {option = value;}
 354                 }
 355
 356                 public string OptionName {
 357                         get {return name;}
 358                         set {name = value;}
 359                 }
 360
 361                 public int OptionIndex {
 362                         get {return index;}
 363                         set {index = value;}
 364                 }
 365
 366                 public OptionSet OptionSet {
 367                         get {return set;}
 368                 }
 369
 370                 public OptionValueCollection OptionValues {
 371                         get {return c;}
 372                 }
 373         }
 374
 375         public enum OptionValueType {
 376                 None,
 377                 Optional,
 378                 Required,
 379         }
 380
 381         public abstract class Option {
 382                 string prototype, description;
 383                 string[] names;
 384                 OptionValueType type;
 385                 int count;
 386                 string[] separators;
 387                 bool hidden;
 388
 389                 protected Option (string prototype, string description)
 390                         : this (prototype, description, 1, false)
 391                 {
 392                 }
 393
 394                 protected Option (string prototype, string description, int maxValueCount)
 395                         : this (prototype, description, maxValueCount, false)
 396                 {
 397                 }
 398
 399                 protected Option (string prototype, string description, int maxValueCount, bool hidden)
 400                 {
 401                         if (prototype == null)
 402                                 throw new ArgumentNullException ("prototype");
 403                         if (prototype.Length == 0)
 404                                 throw new ArgumentException ("Cannot be the empty string.", "prototype");
 405                         if (maxValueCount < 0)
 406                                 throw new ArgumentOutOfRangeException ("maxValueCount");
 407
 408                         this.prototype   = prototype;
 409                         this.description = description;
 410                         this.count       = maxValueCount;
 411                         this.names       = (this is OptionSet.Category)
 412                                 // append GetHashCode() so that "duplicate" categories have distinct
 413                                 // names, e.g. adding multiple "" categories should be valid.
 414                                 ? new[]{prototype + this.GetHashCode ()}
 415                                 : prototype.Split ('|');
 416
 417                         if (this is OptionSet.Category)
 418                                 return;
 419
 420                         this.type        = ParsePrototype ();
 421                         this.hidden      = hidden;
 422
 423                         if (this.count == 0 && type != OptionValueType.None)
 424                                 throw new ArgumentException (
 425                                                 "Cannot provide maxValueCount of 0 for OptionValueType.Required or " +
 426                                                         "OptionValueType.Optional.",
 427                                                 "maxValueCount");
 428                         if (this.type == OptionValueType.None && maxValueCount > 1)
 429                                 throw new ArgumentException (
 430                                                 string.Format ("Cannot provide maxValueCount of {0} for OptionValueType.None.", maxValueCount),
 431                                                 "maxValueCount");
 432                         if (Array.IndexOf (names, "<>") >= 0 &&
 433                                         ((names.Length == 1 && this.type != OptionValueType.None) ||
 434                                          (names.Length > 1 && this.MaxValueCount > 1)))
 435                                 throw new ArgumentException (
 436                                                 "The default option handler '<>' cannot require values.",
 437                                                 "prototype");
 438                 }
 439
 440                 public string           Prototype       {get {return prototype;}}
 441                 public string           Description     {get {return description;}}
 442                 public OptionValueType  OptionValueType {get {return type;}}
 443                 public int              MaxValueCount   {get {return count;}}
 444                 public bool             Hidden          {get {return hidden;}}
 445
 446                 public string[] GetNames ()
 447                 {
 448                         return (string[]) names.Clone ();
 449                 }
 450
 451                 public string[] GetValueSeparators ()
 452                 {
 453                         if (separators == null)
 454                                 return new string [0];
 455                         return (string[]) separators.Clone ();
 456                 }
 457
 458                 protected static T Parse<T> (string value, OptionContext c)
 459                 {
 460                         Type tt = typeof (T);
 461 #if PCL
 462                         TypeInfo ti = tt.GetTypeInfo ();
 463 #else
 464                         Type ti = tt;
 465 #endif
 466                         bool nullable =
 467                                 ti.IsValueType &&
 468                                 ti.IsGenericType &&
 469                                 !ti.IsGenericTypeDefinition &&
 470                                 ti.GetGenericTypeDefinition () == typeof (Nullable<>);
 471 #if PCL
 472                         Type targetType = nullable ? tt.GenericTypeArguments [0] : tt;
 473 #else
 474                         Type targetType = nullable ? tt.GetGenericArguments () [0] : tt;
 475 #endif
 476                         T t = default (T);
 477                         try {
 478                                 if (value != null) {
 479 #if PCL
 480                                         t = (T) Convert.ChangeType (value, targetType);
 481 #else
 482                                         TypeConverter conv = TypeDescriptor.GetConverter (targetType);
 483                                         t = (T) conv.ConvertFromString (value);
 484 #endif
 485                                 }
 486                         }
 487                         catch (Exception e) {
 488                                 throw new OptionException (
 489                                                 string.Format (
 490                                                         c.OptionSet.MessageLocalizer ("Could not convert string `{0}' to type {1} for option `{2}'."),
 491                                                         value, targetType.Name, c.OptionName),
 492                                                 c.OptionName, e);
 493                         }
 494                         return t;
 495                 }
 496
 497                 internal string[] Names           {get {return names;}}
 498                 internal string[] ValueSeparators {get {return separators;}}
 499
 500                 static readonly char[] NameTerminator = new char[]{'=', ':'};
 501
 502                 private OptionValueType ParsePrototype ()
 503                 {
 504                         char type = '\0';
 505                         List<string> seps = new List<string> ();
 506                         for (int i = 0; i < names.Length; ++i) {
 507                                 string name = names [i];
 508                                 if (name.Length == 0)
 509                                         throw new ArgumentException ("Empty option names are not supported.", "prototype");
 510
 511                                 int end = name.IndexOfAny (NameTerminator);
 512                                 if (end == -1)
 513                                         continue;
 514                                 names [i] = name.Substring (0, end);
 515                                 if (type == '\0' || type == name [end])
 516                                         type = name [end];
 517                                 else
 518                                         throw new ArgumentException (
 519                                                         string.Format ("Conflicting option types: '{0}' vs. '{1}'.", type, name [end]),
 520                                                         "prototype");
 521                                 AddSeparators (name, end, seps);
 522                         }
 523
 524                         if (type == '\0')
 525                                 return OptionValueType.None;
 526
 527                         if (count <= 1 && seps.Count != 0)
 528                                 throw new ArgumentException (
 529                                                 string.Format ("Cannot provide key/value separators for Options taking {0} value(s).", count),
 530                                                 "prototype");
 531                         if (count > 1) {
 532                                 if (seps.Count == 0)
 533                                         this.separators = new string[]{":", "="};
 534                                 else if (seps.Count == 1 && seps [0].Length == 0)
 535                                         this.separators = null;
 536                                 else
 537                                         this.separators = seps.ToArray ();
 538                         }
 539
 540                         return type == '=' ? OptionValueType.Required : OptionValueType.Optional;
 541                 }
 542
 543                 private static void AddSeparators (string name, int end, ICollection<string> seps)
 544                 {
 545                         int start = -1;
 546                         for (int i = end+1; i < name.Length; ++i) {
 547                                 switch (name [i]) {
 548                                         case '{':
 549                                                 if (start != -1)
 550                                                         throw new ArgumentException (
 551                                                                         string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
 552                                                                         "prototype");
 553                                                 start = i+1;
 554                                                 break;
 555                                         case '}':
 556                                                 if (start == -1)
 557                                                         throw new ArgumentException (
 558                                                                         string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
 559                                                                         "prototype");
 560                                                 seps.Add (name.Substring (start, i-start));
 561                                                 start = -1;
 562                                                 break;
 563                                         default:
 564                                                 if (start == -1)
 565                                                         seps.Add (name [i].ToString ());
 566                                                 break;
 567                                 }
 568                         }
 569                         if (start != -1)
 570                                 throw new ArgumentException (
 571                                                 string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
 572                                                 "prototype");
 573                 }
 574
 575                 public void Invoke (OptionContext c)
 576                 {
 577                         OnParseComplete (c);
 578                         c.OptionName  = null;
 579                         c.Option      = null;
 580                         c.OptionValues.Clear ();
 581                 }
 582
 583                 protected abstract void OnParseComplete (OptionContext c);
 584
 585                 public override string ToString ()
 586                 {
 587                         return Prototype;
 588                 }
 589         }
 590
 591         public abstract class ArgumentSource {
 592
 593                 protected ArgumentSource ()
 594                 {
 595                 }
 596
 597                 public abstract string[] GetNames ();
 598                 public abstract string Description { get; }
 599                 public abstract bool GetArguments (string value, out IEnumerable<string> replacement);
 600
 601 #if !PCL
 602                 public static IEnumerable<string> GetArgumentsFromFile (string file)
 603                 {
 604                         return GetArguments (File.OpenText (file), true);
 605                 }
 606 #endif
 607
 608                 public static IEnumerable<string> GetArguments (TextReader reader)
 609                 {
 610                         return GetArguments (reader, false);
 611                 }
 612
 613                 // Cribbed from mcs/driver.cs:LoadArgs(string)
 614                 static IEnumerable<string> GetArguments (TextReader reader, bool close)
 615                 {
 616                         try {
 617                                 StringBuilder arg = new StringBuilder ();
 618
 619                                 string line;
 620                                 while ((line = reader.ReadLine ()) != null) {
 621                                         int t = line.Length;
 622
 623                                         for (int i = 0; i < t; i++) {
 624                                                 char c = line [i];
 625
 626                                                 if (c == '"' || c == '\'') {
 627                                                         char end = c;
 628
 629                                                         for (i++; i < t; i++){
 630                                                                 c = line [i];
 631
 632                                                                 if (c == end)
 633                                                                         break;
 634                                                                 arg.Append (c);
 635                                                         }
 636                                                 } else if (c == ' ') {
 637                                                         if (arg.Length > 0) {
 638                                                                 yield return arg.ToString ();
 639                                                                 arg.Length = 0;
 640                                                         }
 641                                                 } else
 642                                                         arg.Append (c);
 643                                         }
 644                                         if (arg.Length > 0) {
 645                                                 yield return arg.ToString ();
 646                                                 arg.Length = 0;
 647                                         }
 648                                 }
 649                         }
 650                         finally {
 651                                 if (close)
 652                                         reader.Dispose ();
 653                         }
 654                 }
 655         }
 656
 657 #if !PCL
 658         public class ResponseFileSource : ArgumentSource {
 659
 660                 public override string[] GetNames ()
 661                 {
 662                         return new string[]{"@file"};
 663                 }
 664
 665                 public override string Description {
 666                         get {return "Read response file for more options.";}
 667                 }
 668
 669                 public override bool GetArguments (string value, out IEnumerable<string> replacement)
 670                 {
 671                         if (string.IsNullOrEmpty (value) || !value.StartsWith ("@")) {
 672                                 replacement = null;
 673                                 return false;
 674                         }
 675                         replacement = ArgumentSource.GetArgumentsFromFile (value.Substring (1));
 676                         return true;
 677                 }
 678         }
 679 #endif
 680
 681 #if !PCL
 682         [Serializable]
 683 #endif
 684         public class OptionException : Exception {
 685                 private string option;
 686
 687                 public OptionException ()
 688                 {
 689                 }
 690
 691                 public OptionException (string message, string optionName)
 692                         : base (message)
 693                 {
 694                         this.option = optionName;
 695                 }
 696
 697                 public OptionException (string message, string optionName, Exception innerException)
 698                         : base (message, innerException)
 699                 {
 700                         this.option = optionName;
 701                 }
 702
 703 #if !PCL
 704                 protected OptionException (SerializationInfo info, StreamingContext context)
 705                         : base (info, context)
 706                 {
 707                         this.option = info.GetString ("OptionName");
 708                 }
 709 #endif
 710
 711                 public string OptionName {
 712                         get {return this.option;}
 713                 }
 714
 715 #if !PCL
 716 #pragma warning disable 618 // SecurityPermissionAttribute is obsolete
 717                 [SecurityPermission (SecurityAction.LinkDemand, SerializationFormatter = true)]
 718 #pragma warning restore 618
 719                 public override void GetObjectData (SerializationInfo info, StreamingContext context)
 720                 {
 721                         base.GetObjectData (info, context);
 722                         info.AddValue ("OptionName", option);
 723                 }
 724 #endif
 725         }
 726
 727         public delegate void OptionAction<TKey, TValue> (TKey key, TValue value);
 728
 729         public class OptionSet : KeyedCollection<string, Option>
 730         {
 731                 public OptionSet ()
 732                         : this (delegate (string f) {return f;})
 733                 {
 734                 }
 735
 736                 public OptionSet (MessageLocalizerConverter localizer)
 737                 {
 738                         this.localizer = localizer;
 739                         this.roSources = new ReadOnlyCollection<ArgumentSource>(sources);
 740                 }
 741
 742                 MessageLocalizerConverter localizer;
 743
 744                 public MessageLocalizerConverter MessageLocalizer {
 745                         get {return localizer;}
 746                 }
 747
 748                 List<ArgumentSource> sources = new List<ArgumentSource> ();
 749                 ReadOnlyCollection<ArgumentSource> roSources;
 750
 751                 public ReadOnlyCollection<ArgumentSource> ArgumentSources {
 752                         get {return roSources;}
 753                 }
 754
 755
 756                 protected override string GetKeyForItem (Option item)
 757                 {
 758                         if (item == null)
 759                                 throw new ArgumentNullException ("option");
 760                         if (item.Names != null && item.Names.Length > 0)
 761                                 return item.Names [0];
 762                         // This should never happen, as it's invalid for Option to be
 763                         // constructed w/o any names.
 764                         throw new InvalidOperationException ("Option has no names!");
 765                 }
 766
 767                 [Obsolete ("Use KeyedCollection.this[string]")]
 768                 protected Option GetOptionForName (string option)
 769                 {
 770                         if (option == null)
 771                                 throw new ArgumentNullException ("option");
 772                         try {
 773                                 return base [option];
 774                         }
 775                         catch (KeyNotFoundException) {
 776                                 return null;
 777                         }
 778                 }
 779
 780                 protected override void InsertItem (int index, Option item)
 781                 {
 782                         base.InsertItem (index, item);
 783                         AddImpl (item);
 784                 }
 785
 786                 protected override void RemoveItem (int index)
 787                 {
 788                         Option p = Items [index];
 789                         base.RemoveItem (index);
 790                         // KeyedCollection.RemoveItem() handles the 0th item
 791                         for (int i = 1; i < p.Names.Length; ++i) {
 792                                 Dictionary.Remove (p.Names [i]);
 793                         }
 794                 }
 795
 796                 protected override void SetItem (int index, Option item)
 797                 {
 798                         base.SetItem (index, item);
 799                         AddImpl (item);
 800                 }
 801
 802                 private void AddImpl (Option option)
 803                 {
 804                         if (option == null)
 805                                 throw new ArgumentNullException ("option");
 806                         List<string> added = new List<string> (option.Names.Length);
 807                         try {
 808                                 // KeyedCollection.InsertItem/SetItem handle the 0th name.
 809                                 for (int i = 1; i < option.Names.Length; ++i) {
 810                                         Dictionary.Add (option.Names [i], option);
 811                                         added.Add (option.Names [i]);
 812                                 }
 813                         }
 814                         catch (Exception) {
 815                                 foreach (string name in added)
 816                                         Dictionary.Remove (name);
 817                                 throw;
 818                         }
 819                 }
 820
 821                 public OptionSet Add (string header)
 822                 {
 823                         if (header == null)
 824                                 throw new ArgumentNullException ("header");
 825                         Add (new Category (header));
 826                         return this;
 827                 }
 828
 829                 internal sealed class Category : Option {
 830
 831                         // Prototype starts with '=' because this is an invalid prototype
 832                         // (see Option.ParsePrototype(), and thus it'll prevent Category
 833                         // instances from being accidentally used as normal options.
 834                         public Category (string description)
 835                                 : base ("=:Category:= " + description, description)
 836                         {
 837                         }
 838
 839                         protected override void OnParseComplete (OptionContext c)
 840                         {
 841                                 throw new NotSupportedException ("Category.OnParseComplete should not be invoked.");
 842                         }
 843                 }
 844
 845
 846                 public new OptionSet Add (Option option)
 847                 {
 848                         base.Add (option);
 849                         return this;
 850                 }
 851
 852                 sealed class ActionOption : Option {
 853                         Action<OptionValueCollection> action;
 854
 855                         public ActionOption (string prototype, string description, int count, Action<OptionValueCollection> action)
 856                                 : this (prototype, description, count, action, false)
 857                         {
 858                         }
 859
 860                         public ActionOption (string prototype, string description, int count, Action<OptionValueCollection> action, bool hidden)
 861                                 : base (prototype, description, count, hidden)
 862                         {
 863                                 if (action == null)
 864                                         throw new ArgumentNullException ("action");
 865                                 this.action = action;
 866                         }
 867
 868                         protected override void OnParseComplete (OptionContext c)
 869                         {
 870                                 action (c.OptionValues);
 871                         }
 872                 }
 873
 874                 public OptionSet Add (string prototype, Action<string> action)
 875                 {
 876                         return Add (prototype, null, action);
 877                 }
 878
 879                 public OptionSet Add (string prototype, string description, Action<string> action)
 880                 {
 881                         return Add (prototype, description, action, false);
 882                 }
 883
 884                 public OptionSet Add (string prototype, string description, Action<string> action, bool hidden)
 885                 {
 886                         if (action == null)
 887                                 throw new ArgumentNullException ("action");
 888                         Option p = new ActionOption (prototype, description, 1,
 889                                         delegate (OptionValueCollection v) { action (v [0]); }, hidden);
 890                         base.Add (p);
 891                         return this;
 892                 }
 893
 894                 public OptionSet Add (string prototype, OptionAction<string, string> action)
 895                 {
 896                         return Add (prototype, null, action);
 897                 }
 898
 899                 public OptionSet Add (string prototype, string description, OptionAction<string, string> action)
 900                 {
 901                         return Add (prototype, description, action, false);
 902                 }
 903
 904                 public OptionSet Add (string prototype, string description, OptionAction<string, string> action, bool hidden)   {
 905                         if (action == null)
 906                                 throw new ArgumentNullException ("action");
 907                         Option p = new ActionOption (prototype, description, 2,
 908                                         delegate (OptionValueCollection v) {action (v [0], v [1]);}, hidden);
 909                         base.Add (p);
 910                         return this;
 911                 }
 912
 913                 sealed class ActionOption<T> : Option {
 914                         Action<T> action;
 915
 916                         public ActionOption (string prototype, string description, Action<T> action)
 917                                 : base (prototype, description, 1)
 918                         {
 919                                 if (action == null)
 920                                         throw new ArgumentNullException ("action");
 921                                 this.action = action;
 922                         }
 923
 924                         protected override void OnParseComplete (OptionContext c)
 925                         {
 926                                 action (Parse<T> (c.OptionValues [0], c));
 927                         }
 928                 }
 929
 930                 sealed class ActionOption<TKey, TValue> : Option {
 931                         OptionAction<TKey, TValue> action;
 932
 933                         public ActionOption (string prototype, string description, OptionAction<TKey, TValue> action)
 934                                 : base (prototype, description, 2)
 935                         {
 936                                 if (action == null)
 937                                         throw new ArgumentNullException ("action");
 938                                 this.action = action;
 939                         }
 940
 941                         protected override void OnParseComplete (OptionContext c)
 942                         {
 943                                 action (
 944                                                 Parse<TKey> (c.OptionValues [0], c),
 945                                                 Parse<TValue> (c.OptionValues [1], c));
 946                         }
 947                 }
 948
 949                 public OptionSet Add<T> (string prototype, Action<T> action)
 950                 {
 951                         return Add (prototype, null, action);
 952                 }
 953
 954                 public OptionSet Add<T> (string prototype, string description, Action<T> action)
 955                 {
 956                         return Add (new ActionOption<T> (prototype, description, action));
 957                 }
 958
 959                 public OptionSet Add<TKey, TValue> (string prototype, OptionAction<TKey, TValue> action)
 960                 {
 961                         return Add (prototype, null, action);
 962                 }
 963
 964                 public OptionSet Add<TKey, TValue> (string prototype, string description, OptionAction<TKey, TValue> action)
 965                 {
 966                         return Add (new ActionOption<TKey, TValue> (prototype, description, action));
 967                 }
 968
 969                 public OptionSet Add (ArgumentSource source)
 970                 {
 971                         if (source == null)
 972                                 throw new ArgumentNullException ("source");
 973                         sources.Add (source);
 974                         return this;
 975                 }
 976
 977                 protected virtual OptionContext CreateOptionContext ()
 978                 {
 979                         return new OptionContext (this);
 980                 }
 981
 982                 public List<string> Parse (IEnumerable<string> arguments)
 983                 {
 984                         if (arguments == null)
 985                                 throw new ArgumentNullException ("arguments");
 986                         OptionContext c = CreateOptionContext ();
 987                         c.OptionIndex = -1;
 988                         bool process = true;
 989                         List<string> unprocessed = new List<string> ();
 990                         Option def = Contains ("<>") ? this ["<>"] : null;
 991                         ArgumentEnumerator ae = new ArgumentEnumerator (arguments);
 992                         foreach (string argument in ae) {
 993                                 ++c.OptionIndex;
 994                                 if (argument == "--") {
 995                                         process = false;
 996                                         continue;
 997                                 }
 998                                 if (!process) {
 999                                         Unprocessed (unprocessed, def, c, argument);
1000                                         continue;
1001                                 }
1002                                 if (AddSource (ae, argument))
1003                                         continue;
1004                                 if (!Parse (argument, c))
1005                                         Unprocessed (unprocessed, def, c, argument);
1006                         }
1007                         if (c.Option != null)
1008                                 c.Option.Invoke (c);
1009                         return unprocessed;
1010                 }
1011
1012                 class ArgumentEnumerator : IEnumerable<string> {
1013                         List<IEnumerator<string>> sources = new List<IEnumerator<string>> ();
1014
1015                         public ArgumentEnumerator (IEnumerable<string> arguments)
1016                         {
1017                                 sources.Add (arguments.GetEnumerator ());
1018                         }
1019
1020                         public void Add (IEnumerable<string> arguments)
1021                         {
1022                                 sources.Add (arguments.GetEnumerator ());
1023                         }
1024
1025                         public IEnumerator<string> GetEnumerator ()
1026                         {
1027                                 do {
1028                                         IEnumerator<string> c = sources [sources.Count-1];
1029                                         if (c.MoveNext ())
1030                                                 yield return c.Current;
1031                                         else {
1032                                                 c.Dispose ();
1033                                                 sources.RemoveAt (sources.Count-1);
1034                                         }
1035                                 } while (sources.Count > 0);
1036                         }
1037
1038                         IEnumerator IEnumerable.GetEnumerator ()
1039                         {
1040                                 return GetEnumerator ();
1041                         }
1042                 }
1043
1044                 bool AddSource (ArgumentEnumerator ae, string argument)
1045                 {
1046                         foreach (ArgumentSource source in sources) {
1047                                 IEnumerable<string> replacement;
1048                                 if (!source.GetArguments (argument, out replacement))
1049                                         continue;
1050                                 ae.Add (replacement);
1051                                 return true;
1052                         }
1053                         return false;
1054                 }
1055
1056                 private static bool Unprocessed (ICollection<string> extra, Option def, OptionContext c, string argument)
1057                 {
1058                         if (def == null) {
1059                                 extra.Add (argument);
1060                                 return false;
1061                         }
1062                         c.OptionValues.Add (argument);
1063                         c.Option = def;
1064                         c.Option.Invoke (c);
1065                         return false;
1066                 }
1067
1068                 private readonly Regex ValueOption = new Regex (
1069                         @"^(?<flag>--|-|/)(?<name>[^:=]+)((?<sep>[:=])(?<value>.*))?$");
1070
1071                 protected bool GetOptionParts (string argument, out string flag, out string name, out string sep, out string value)
1072                 {
1073                         if (argument == null)
1074                                 throw new ArgumentNullException ("argument");
1075
1076                         flag = name = sep = value = null;
1077                         Match m = ValueOption.Match (argument);
1078                         if (!m.Success) {
1079                                 return false;
1080                         }
1081                         flag  = m.Groups ["flag"].Value;
1082                         name  = m.Groups ["name"].Value;
1083                         if (m.Groups ["sep"].Success && m.Groups ["value"].Success) {
1084                                 sep   = m.Groups ["sep"].Value;
1085                                 value = m.Groups ["value"].Value;
1086                         }
1087                         return true;
1088                 }
1089
1090                 protected virtual bool Parse (string argument, OptionContext c)
1091                 {
1092                         if (c.Option != null) {
1093                                 ParseValue (argument, c);
1094                                 return true;
1095                         }
1096
1097                         string f, n, s, v;
1098                         if (!GetOptionParts (argument, out f, out n, out s, out v))
1099                                 return false;
1100
1101                         Option p;
1102                         if (Contains (n)) {
1103                                 p = this [n];
1104                                 c.OptionName = f + n;
1105                                 c.Option     = p;
1106                                 switch (p.OptionValueType) {
1107                                         case OptionValueType.None:
1108                                                 c.OptionValues.Add (n);
1109                                                 c.Option.Invoke (c);
1110                                                 break;
1111                                         case OptionValueType.Optional:
1112                                         case OptionValueType.Required:
1113                                                 ParseValue (v, c);
1114                                                 break;
1115                                 }
1116                                 return true;
1117                         }
1118                         // no match; is it a bool option?
1119                         if (ParseBool (argument, n, c))
1120                                 return true;
1121                         // is it a bundled option?
1122                         if (ParseBundledValue (f, string.Concat (n + s + v), c))
1123                                 return true;
1124
1125                         return false;
1126                 }
1127
1128                 private void ParseValue (string option, OptionContext c)
1129                 {
1130                         if (option != null)
1131                                 foreach (string o in c.Option.ValueSeparators != null
1132                                                 ? option.Split (c.Option.ValueSeparators, c.Option.MaxValueCount - c.OptionValues.Count, StringSplitOptions.None)
1133                                                 : new string[]{option}) {
1134                                         c.OptionValues.Add (o);
1135                                 }
1136                         if (c.OptionValues.Count == c.Option.MaxValueCount ||
1137                                         c.Option.OptionValueType == OptionValueType.Optional)
1138                                 c.Option.Invoke (c);
1139                         else if (c.OptionValues.Count > c.Option.MaxValueCount) {
1140                                 throw new OptionException (localizer (string.Format (
1141                                                                 "Error: Found {0} option values when expecting {1}.",
1142                                                                 c.OptionValues.Count, c.Option.MaxValueCount)),
1143                                                 c.OptionName);
1144                         }
1145                 }
1146
1147                 private bool ParseBool (string option, string n, OptionContext c)
1148                 {
1149                         Option p;
1150                         string rn;
1151                         if (n.Length >= 1 && (n [n.Length-1] == '+' || n [n.Length-1] == '-') &&
1152                                         Contains ((rn = n.Substring (0, n.Length-1)))) {
1153                                 p = this [rn];
1154                                 string v = n [n.Length-1] == '+' ? option : null;
1155                                 c.OptionName  = option;
1156                                 c.Option      = p;
1157                                 c.OptionValues.Add (v);
1158                                 p.Invoke (c);
1159                                 return true;
1160                         }
1161                         return false;
1162                 }
1163
1164                 private bool ParseBundledValue (string f, string n, OptionContext c)
1165                 {
1166                         if (f != "-")
1167                                 return false;
1168                         for (int i = 0; i < n.Length; ++i) {
1169                                 Option p;
1170                                 string opt = f + n [i].ToString ();
1171                                 string rn = n [i].ToString ();
1172                                 if (!Contains (rn)) {
1173                                         if (i == 0)
1174                                                 return false;
1175                                         throw new OptionException (string.Format (localizer (
1176                                                                         "Cannot use unregistered option '{0}' in bundle '{1}'."), rn, f + n), null);
1177                                 }
1178                                 p = this [rn];
1179                                 switch (p.OptionValueType) {
1180                                         case OptionValueType.None:
1181                                                 Invoke (c, opt, n, p);
1182                                                 break;
1183                                         case OptionValueType.Optional:
1184                                         case OptionValueType.Required: {
1185                                                 string v     = n.Substring (i+1);
1186                                                 c.Option     = p;
1187                                                 c.OptionName = opt;
1188                                                 ParseValue (v.Length != 0 ? v : null, c);
1189                                                 return true;
1190                                         }
1191                                         default:
1192                                                 throw new InvalidOperationException ("Unknown OptionValueType: " + p.OptionValueType);
1193                                 }
1194                         }
1195                         return true;
1196                 }
1197
1198                 private static void Invoke (OptionContext c, string name, string value, Option option)
1199                 {
1200                         c.OptionName  = name;
1201                         c.Option      = option;
1202                         c.OptionValues.Add (value);
1203                         option.Invoke (c);
1204                 }
1205
1206                 private const int OptionWidth = 29;
1207                 private const int Description_FirstWidth  = 80 - OptionWidth;
1208                 private const int Description_RemWidth    = 80 - OptionWidth - 2;
1209
1210                 public void WriteOptionDescriptions (TextWriter o)
1211                 {
1212                         foreach (Option p in this) {
1213                                 int written = 0;
1214
1215                                 if (p.Hidden)
1216                                         continue;
1217
1218                                 Category c = p as Category;
1219                                 if (c != null) {
1220                                         WriteDescription (o, p.Description, "", 80, 80);
1221                                         continue;
1222                                 }
1223
1224                                 if (!WriteOptionPrototype (o, p, ref written))
1225                                         continue;
1226
1227                                 if (written < OptionWidth)
1228                                         o.Write (new string (' ', OptionWidth - written));
1229                                 else {
1230                                         o.WriteLine ();
1231                                         o.Write (new string (' ', OptionWidth));
1232                                 }
1233
1234                                 WriteDescription (o, p.Description, new string (' ', OptionWidth+2),
1235                                                 Description_FirstWidth, Description_RemWidth);
1236                         }
1237
1238                         foreach (ArgumentSource s in sources) {
1239                                 string[] names = s.GetNames ();
1240                                 if (names == null || names.Length == 0)
1241                                         continue;
1242
1243                                 int written = 0;
1244
1245                                 Write (o, ref written, "  ");
1246                                 Write (o, ref written, names [0]);
1247                                 for (int i = 1; i < names.Length; ++i) {
1248                                         Write (o, ref written, ", ");
1249                                         Write (o, ref written, names [i]);
1250                                 }
1251
1252                                 if (written < OptionWidth)
1253                                         o.Write (new string (' ', OptionWidth - written));
1254                                 else {
1255                                         o.WriteLine ();
1256                                         o.Write (new string (' ', OptionWidth));
1257                                 }
1258
1259                                 WriteDescription (o, s.Description, new string (' ', OptionWidth+2),
1260                                                 Description_FirstWidth, Description_RemWidth);
1261                         }
1262                 }
1263
1264                 void WriteDescription (TextWriter o, string value, string prefix, int firstWidth, int remWidth)
1265                 {
1266                         bool indent = false;
1267                         foreach (string line in GetLines (localizer (GetDescription (value)), firstWidth, remWidth)) {
1268                                 if (indent)
1269                                         o.Write (prefix);
1270                                 o.WriteLine (line);
1271                                 indent = true;
1272                         }
1273                 }
1274
1275                 bool WriteOptionPrototype (TextWriter o, Option p, ref int written)
1276                 {
1277                         string[] names = p.Names;
1278
1279                         int i = GetNextOptionIndex (names, 0);
1280                         if (i == names.Length)
1281                                 return false;
1282
1283                         if (names [i].Length == 1) {
1284                                 Write (o, ref written, "  -");
1285                                 Write (o, ref written, names [0]);
1286                         }
1287                         else {
1288                                 Write (o, ref written, "      --");
1289                                 Write (o, ref written, names [0]);
1290                         }
1291
1292                         for ( i = GetNextOptionIndex (names, i+1);
1293                                         i < names.Length; i = GetNextOptionIndex (names, i+1)) {
1294                                 Write (o, ref written, ", ");
1295                                 Write (o, ref written, names [i].Length == 1 ? "-" : "--");
1296                                 Write (o, ref written, names [i]);
1297                         }
1298
1299                         if (p.OptionValueType == OptionValueType.Optional ||
1300                                         p.OptionValueType == OptionValueType.Required) {
1301                                 if (p.OptionValueType == OptionValueType.Optional) {
1302                                         Write (o, ref written, localizer ("["));
1303                                 }
1304                                 Write (o, ref written, localizer ("=" + GetArgumentName (0, p.MaxValueCount, p.Description)));
1305                                 string sep = p.ValueSeparators != null && p.ValueSeparators.Length > 0
1306                                         ? p.ValueSeparators [0]
1307                                         : " ";
1308                                 for (int c = 1; c < p.MaxValueCount; ++c) {
1309                                         Write (o, ref written, localizer (sep + GetArgumentName (c, p.MaxValueCount, p.Description)));
1310                                 }
1311                                 if (p.OptionValueType == OptionValueType.Optional) {
1312                                         Write (o, ref written, localizer ("]"));
1313                                 }
1314                         }
1315                         return true;
1316                 }
1317
1318                 static int GetNextOptionIndex (string[] names, int i)
1319                 {
1320                         while (i < names.Length && names [i] == "<>") {
1321                                 ++i;
1322                         }
1323                         return i;
1324                 }
1325
1326                 static void Write (TextWriter o, ref int n, string s)
1327                 {
1328                         n += s.Length;
1329                         o.Write (s);
1330                 }
1331
1332                 private static string GetArgumentName (int index, int maxIndex, string description)
1333                 {
1334                         if (description == null)
1335                                 return maxIndex == 1 ? "VALUE" : "VALUE" + (index + 1);
1336                         string[] nameStart;
1337                         if (maxIndex == 1)
1338                                 nameStart = new string[]{"{0:", "{"};
1339                         else
1340                                 nameStart = new string[]{"{" + index + ":"};
1341                         for (int i = 0; i < nameStart.Length; ++i) {
1342                                 int start, j = 0;
1343                                 do {
1344                                         start = description.IndexOf (nameStart [i], j);
1345                                 } while (start >= 0 && j != 0 ? description [j++ - 1] == '{' : false);
1346                                 if (start == -1)
1347                                         continue;
1348                                 int end = description.IndexOf ("}", start);
1349                                 if (end == -1)
1350                                         continue;
1351                                 return description.Substring (start + nameStart [i].Length, end - start - nameStart [i].Length);
1352                         }
1353                         return maxIndex == 1 ? "VALUE" : "VALUE" + (index + 1);
1354                 }
1355
1356                 private static string GetDescription (string description)
1357                 {
1358                         if (description == null)
1359                                 return string.Empty;
1360                         StringBuilder sb = new StringBuilder (description.Length);
1361                         int start = -1;
1362                         for (int i = 0; i < description.Length; ++i) {
1363                                 switch (description [i]) {
1364                                         case '{':
1365                                                 if (i == start) {
1366                                                         sb.Append ('{');
1367                                                         start = -1;
1368                                                 }
1369                                                 else if (start < 0)
1370                                                         start = i + 1;
1371                                                 break;
1372                                         case '}':
1373                                                 if (start < 0) {
1374                                                         if ((i+1) == description.Length || description [i+1] != '}')
1375                                                                 throw new InvalidOperationException ("Invalid option description: " + description);
1376                                                         ++i;
1377                                                         sb.Append ("}");
1378                                                 }
1379                                                 else {
1380                                                         sb.Append (description.Substring (start, i - start));
1381                                                         start = -1;
1382                                                 }
1383                                                 break;
1384                                         case ':':
1385                                                 if (start < 0)
1386                                                         goto default;
1387                                                 start = i + 1;
1388                                                 break;
1389                                         default:
1390                                                 if (start < 0)
1391                                                         sb.Append (description [i]);
1392                                                 break;
1393                                 }
1394                         }
1395                         return sb.ToString ();
1396                 }
1397
1398                 private static IEnumerable<string> GetLines (string description, int firstWidth, int remWidth)
1399                 {
1400                         return StringCoda.WrappedLines (description, firstWidth, remWidth);
1401                 }
1402         }
1403 }
1404