mcs/class/corlib/System/String.cs

   1 // -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
   2 //
   3 // System.String.cs
   4 //
   5 // Author:
   6 //   Jeffrey Stedfast (fejj@ximian.com)
   7 //
   8 // (C) 2001 Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11 // FIXME: from what I gather from msdn, when a function is to return an empty string
  12 //        we should be returning this.Empty - some methods do this and others don't.
  13
  14 // FIXME: I didn't realise until later that `string' has a .Length method and so
  15 //        I am missing some proper bounds-checking in some methods. Find these
  16 //        instances and throw the ArgumentOutOfBoundsException at the programmer.
  17 //        I like pelting programmers with ArgumentOutOfBoundsException's :-)
  18
  19 // FIXME: The ToLower(), ToUpper(), and Compare(..., bool ignoreCase) methods
  20 //        need to be made unicode aware.
  21
  22 // FIXME: when you have a char carr[], does carr.Length include the terminating null char?
  23
  24 using System;
  25 using System.Text;
  26 using System.Collections;
  27 using System.Globalization;
  28 using System.Runtime.CompilerServices;
  29
  30 namespace System {
  31
  32         public sealed class String : IComparable, ICloneable, IConvertible, IEnumerable {
  33                 public static readonly string Empty = "";
  34                 private char[] c_str;
  35                 private int length;
  36
  37                 // Constructors
  38
  39                 internal String (int storage)
  40                 {
  41                         length = storage;
  42                         c_str = new char [storage];
  43                 }
  44
  45                 [CLSCompliant(false)]
  46                 unsafe public String (char *value)
  47                 {
  48                         int i;
  49
  50                         // FIXME: can I do value.Length here?
  51                         if (value == null) {
  52                                 this.length = 0;
  53                         } else {
  54                                 for (i = 0; *(value + i) != '\0'; i++);
  55                                 this.length = i;
  56                         }
  57
  58                         this.c_str = new char [this.length + 1];
  59                         for (i = 0; i < this.length; i++)
  60                                 this.c_str[i] = *(value + i);
  61                 }
  62
  63                 public String (char[] value)
  64                 {
  65                         int i;
  66
  67                         // FIXME: value.Length includes the terminating null char?
  68                         this.length = value != null ? strlen (value): 0;
  69                         this.c_str = new char [this.length + 1];
  70                         for (i = 0; i < this.length; i++)
  71                                 this.c_str[i] = value[i];
  72                 }
  73
  74                 [CLSCompliant(false)]
  75                 unsafe public String (sbyte *value)
  76                 {
  77                         // FIXME: consider unicode?
  78                         int i;
  79
  80                         // FIXME: can I do value.Length here? */
  81                         if (value == null) {
  82                                 this.length = 0;
  83                         } else {
  84                                 for (i = 0; *(value + i) != '\0'; i++);
  85                                 this.length = i;
  86                         }
  87
  88                         this.c_str = new char [this.length + 1];
  89                         for (i = 0; i < this.length; i++)
  90                                 this.c_str[i] = (char) *(value + i);
  91                 }
  92
  93                 public String (char c, int count)
  94                 {
  95                         int i;
  96
  97                         this.length = count;
  98                         this.c_str = new char [count + 1];
  99                         for (i = 0; i < count; i++)
 100                                 this.c_str[i] = c;
 101                 }
 102
 103                 [CLSCompliant(false)]
 104                 unsafe public String (char *value, int startIndex, int length)
 105                 {
 106                         int i;
 107
 108                         if (value == null && startIndex != 0 && length != 0)
 109                                 throw new ArgumentNullException ();
 110
 111                         if (startIndex < 0 || length < 0)
 112                                 throw new ArgumentOutOfRangeException ();
 113
 114                         this.length = length;
 115                         this.c_str = new char [length + 1];
 116                         for (i = 0; i < length; i++)
 117                                 this.c_str[i] = *(value + startIndex + i);
 118                 }
 119
 120                 public String (char[] value, int startIndex, int length)
 121                 {
 122                         int i;
 123
 124                         if (value == null && startIndex != 0 && length != 0)
 125                                 throw new ArgumentNullException ();
 126
 127                         if (startIndex < 0 || length < 0)
 128                                 throw new ArgumentOutOfRangeException ();
 129
 130                         this.length = length;
 131                         this.c_str = new char [length + 1];
 132                         for (i = 0; i < length; i++)
 133                                 this.c_str[i] = value[startIndex + i];
 134                 }
 135
 136                 [CLSCompliant(false)]
 137                 unsafe public String (sbyte *value, int startIndex, int length)
 138                 {
 139                         // FIXME: consider unicode?
 140                         int i;
 141
 142                         if (value == null && startIndex != 0 && length != 0)
 143                                 throw new ArgumentNullException ();
 144
 145                         if (startIndex < 0 || length < 0)
 146                                 throw new ArgumentOutOfRangeException ();
 147
 148                         this.length = length;
 149                         this.c_str = new char [length + 1];
 150                         for (i = 0; i < length; i++)
 151                                 this.c_str[i] = (char) *(value + startIndex + i);
 152                 }
 153
 154                 [CLSCompliant(false)][MonoTODO]
 155                 unsafe public String (sbyte *value, int startIndex, int length, Encoding enc)
 156                 {
 157                         // FIXME: implement me
 158                 }
 159
 160                 ~String ()
 161                 {
 162                         // FIXME: is there anything we need to do here?
 163                         /*base.Finalize ();*/
 164                 }
 165
 166                 // Properties
 167                 public int Length {
 168                         get {
 169                                 return this.length;
 170                         }
 171                 }
 172
 173                 // FIXME: is this correct syntax??
 174                 public char this [int index] {
 175                         get {
 176                                 if (index >= this.length)
 177                                         throw new ArgumentOutOfRangeException ();
 178
 179                                 return this.c_str[index];
 180                         }
 181                 }
 182
 183                 // Private helper methods
 184                 private static int strlen (char[] str)
 185                 {
 186                         // FIXME: if str.Length includes terminating null char, then return (str.Length - 1)
 187                         return str.Length;
 188                 }
 189
 190                 [MonoTODO]
 191                 private static char tolowerordinal (char c)
 192                 {
 193                         // FIXME: implement me
 194                         return c;
 195                 }
 196
 197                 private static bool is_lwsp (char c)
 198                 {
 199                         /* this comes from the msdn docs for String.Trim() */
 200                         if ((c >= '\x9' && c <= '\xD') || c == '\x20' || c == '\xA0' ||
 201                             (c >= '\x2000' && c <= '\x200B') || c == '\x3000' || c == '\xFEFF')
 202                                 return true;
 203                         else
 204                                 return false;
 205                 }
 206
 207                 private static int BoyerMoore (char[] haystack, string needle, int startIndex, int count)
 208                 {
 209                         /* (hopefully) Unicode-safe Boyer-Moore implementation */
 210                         int[] skiptable = new int[65536];  /* our unicode-safe skip-table */
 211                         int h, n, he, ne, hc, nc, i;
 212
 213                         if (haystack == null || needle == null)
 214                                 throw new ArgumentNullException ();
 215
 216                         /* if the search buffer is shorter than the pattern buffer, we can't match */
 217                         if (count < needle.Length)
 218                                 return -1;
 219
 220                         /* return an instant match if the pattern is 0-length */
 221                         if (needle.Length == 0)
 222                                 return startIndex;
 223
 224                         /* set a pointer at the end of each string */
 225                         ne = needle.Length - 1;      /* position of char before '\0' */
 226                         he = startIndex + count;     /* position of last valid char */
 227
 228                         /* init the skip table with the pattern length */
 229                         for (i = 0; i < 65536; i++)
 230                                 skiptable[i] = needle.Length;
 231
 232                         /* set the skip value for the chars that *do* appear in the
 233                          * pattern buffer (needle) to the distance from the index to
 234                          * the end of the pattern buffer. */
 235                         for (nc = 0; nc < ne; nc++)
 236                                 skiptable[(int) needle[nc]] = ne - nc;
 237
 238                         h = startIndex;
 239                         while (count >= needle.Length) {
 240                                 hc = h + needle.Length - 1;  /* set the haystack compare pointer */
 241                                 nc = ne;                     /* set the needle compare pointer */
 242
 243                                 /* work our way backwards until they don't match */
 244                                 for (i = 0; nc > 0; nc--, hc--, i++)
 245                                         if (needle[nc] != haystack[hc])
 246                                                 break;
 247
 248                                 if (needle[nc] != haystack[hc]) {
 249                                         n = skiptable[(int) haystack[hc]] - i;
 250                                         h += n;
 251                                         count -= n;
 252                                 } else
 253                                         return h;
 254                         }
 255
 256                         return -1;
 257                 }
 258
 259                 // Methods
 260                 [MonoTODO]
 261                 public object Clone ()
 262                 {
 263                         // FIXME: implement me
 264                         return null;
 265                 }
 266
 267                 public static int Compare (string strA, string strB)
 268                 {
 269                         int min, i;
 270
 271                         if (strA == null) {
 272                                 if (strB == null)
 273                                         return 0;
 274                                 else
 275                                         return -1;
 276                         } else if (strB == null)
 277                                 return 1;
 278
 279                         min = strA.length < strB.length ? strA.length : strB.length;
 280
 281                         for (i = 0; i < min; i++) {
 282                                 if (strA.c_str[i] != strB.c_str[i]) {
 283                                         return (int)strA.c_str[i] - (int)strB.c_str[i];
 284                                 }
 285                         }
 286                         if (strA.length == strB.length) {
 287                                 return 0;
 288                         }
 289                         if (strA.length > min) {
 290                                 return 1;
 291                         } else {
 292                                 return -1;
 293                         }
 294                 }
 295
 296                 public static int Compare (string strA, string strB, bool ignoreCase)
 297                 {
 298                         int min, i;
 299
 300                         if (!ignoreCase)
 301                                 return Compare (strA, strB);
 302
 303                         /*
 304                          * And here I thought Eazel developers were on crack...
 305                          * if a string is null it should pelt the programmer with
 306                          * ArgumentNullExceptions, damnit!
 307                          */
 308                         if (strA == null) {
 309                                 if (strB == null)
 310                                         return 0;
 311                                 else
 312                                         return -1;
 313                         } else if (strB == null)
 314                                 return 1;
 315
 316                         min = strA.length < strB.length ? strA.length : strB.length;
 317
 318                         for (i = 0; i < min; i++) {
 319                                 if (Char.ToLower (strA.c_str[i]) != Char.ToLower (strB.c_str[i]))
 320                                         break;
 321                         }
 322
 323                         return ((int) (strA.c_str[i] - strB.c_str[i]));
 324                 }
 325
 326                 [MonoTODO]
 327                 public static int Compare (string strA, string strB, bool ignoreCase, CultureInfo culture)
 328                 {
 329                         // FIXME: implement me
 330                         return 0;
 331                 }
 332
 333                 public static int Compare (string strA, int indexA, string strB, int indexB, int length)
 334                 {
 335                         int i;
 336
 337                         if (length < 0 || indexA < 0 || indexB < 0)
 338                                 throw new ArgumentOutOfRangeException ();
 339
 340                         if (indexA > strA.Length || indexB > strB.Length)
 341                                 throw new ArgumentOutOfRangeException ();
 342
 343                         /* And again with the ("" > null) logic... lord have mercy! */
 344                         if (strA == null) {
 345                                 if (strB == null)
 346                                         return 0;
 347                                 else
 348                                         return -1;
 349                         } else if (strB == null)
 350                                 return 1;
 351
 352                         for (i = 0; i < length - 1; i++) {
 353                                 if (strA[indexA + i] != strB[indexB + i])
 354                                         break;
 355                         }
 356
 357                         return ((int) (strA[indexA + i] - strB[indexB + i]));
 358                 }
 359
 360                 public static int Compare (string strA, int indexA, string strB, int indexB,
 361                                            int length, bool ignoreCase)
 362                 {
 363                         int i;
 364
 365                         if (!ignoreCase)
 366                                 return Compare (strA, indexA, strB, indexB, length);
 367
 368                         if (length < 0 || indexA < 0 || indexB < 0)
 369                                 throw new ArgumentOutOfRangeException ();
 370
 371                         if (indexA > strA.Length || indexB > strB.Length)
 372                                 throw new ArgumentOutOfRangeException ();
 373
 374                         /* When will the hurting stop!?!? */
 375                         if (strA == null) {
 376                                 if (strB == null)
 377                                         return 0;
 378                                 else
 379                                         return -1;
 380                         } else if (strB == null)
 381                                 return 1;
 382
 383                         for (i = 0; i < length - 1; i++) {
 384                                 if (Char.ToLower (strA[indexA + i]) != Char.ToLower (strB[indexB + i]))
 385                                         break;
 386                         }
 387
 388                         return ((int) (strA[indexA + i] - strB[indexB + i]));
 389                 }
 390
 391                 [MonoTODO]
 392                 public static int Compare (string strA, int indexA, string strB, int indexB,
 393                                            int length, bool ignoreCase, CultureInfo culture)
 394                 {
 395                         if (culture == null)
 396                                 throw new ArgumentNullException ();
 397
 398                         if (length < 0 || indexA < 0 || indexB < 0)
 399                                 throw new ArgumentOutOfRangeException ();
 400
 401                         if (indexA > strA.Length || indexB > strB.Length)
 402                                 throw new ArgumentOutOfRangeException ();
 403
 404                         /* I can't take it anymore! */
 405                         if (strA == null) {
 406                                 if (strB == null)
 407                                         return 0;
 408                                 else
 409                                         return -1;
 410                         } else if (strB == null)
 411                                 return 1;
 412
 413                         // FIXME: implement me
 414                         return 0;
 415                 }
 416
 417                 public static int CompareOrdinal (string strA, string strB)
 418                 {
 419                         int i;
 420
 421                         /* Please God, make it stop! */
 422                         if (strA == null) {
 423                                 if (strB == null)
 424                                         return 0;
 425                                 else
 426                                         return -1;
 427                         } else if (strB == null)
 428                                 return 1;
 429
 430                         for (i = 0; i < strA.Length && i < strB.Length; i++) {
 431                                 char cA, cB;
 432
 433                                 cA = tolowerordinal (strA[i]);
 434                                 cB = tolowerordinal (strB[i]);
 435
 436                                 if (cA != cB)
 437                                         break;
 438                         }
 439
 440                         return ((int) (strA[i] - strB[i]));
 441                 }
 442
 443                 public static int CompareOrdinal (string strA, int indexA, string strB, int indexB,
 444                                                   int length)
 445                 {
 446                         int i;
 447
 448                         if (length < 0 || indexA < 0 || indexB < 0)
 449                                 throw new ArgumentOutOfRangeException ();
 450
 451                         if (strA == null) {
 452                                 if (strB == null)
 453                                         return 0;
 454                                 else
 455                                         return -1;
 456                         } else if (strB == null)
 457                                 return 1;
 458
 459                         for (i = 0; i < length; i++) {
 460                                 char cA, cB;
 461
 462                                 cA = tolowerordinal (strA[indexA + i]);
 463                                 cB = tolowerordinal (strB[indexB + i]);
 464
 465                                 if (cA != cB)
 466                                         break;
 467                         }
 468
 469                         return ((int) (strA[indexA + i] - strB[indexB + i]));
 470                 }
 471
 472                 public int CompareTo (object obj)
 473                 {
 474                         return Compare (this, obj == null ? null : obj.ToString ());
 475                 }
 476
 477                 public int CompareTo (string str)
 478                 {
 479                         return Compare (this, str);
 480                 }
 481
 482                 public static string Concat (object arg)
 483                 {
 484                         return arg != null ? arg.ToString () : String.Empty;
 485                 }
 486
 487                 public static string Concat (params object[] args)
 488                 {
 489                         string[] strings;
 490                         char[] str;
 491                         int len, i;
 492
 493                         if (args == null)
 494                                 throw new ArgumentNullException ();
 495
 496                         strings = new string [args.Length];
 497                         len = 0;
 498                         i = 0;
 499                         foreach (object arg in args) {
 500                                 /* use Empty for each null argument */
 501                                 if (arg == null)
 502                                         strings[i] = String.Empty;
 503                                 else
 504                                         strings[i] = arg.ToString ();
 505                                 len += strings[i].length;
 506                                 i++;
 507                         }
 508
 509                         if (len == 0)
 510                                 return String.Empty;
 511
 512                         String res = new String (len);
 513                         str = res.c_str;
 514                         i = 0;
 515                         for (int j = 0; j < strings.Length; j++)
 516                                 for (int k = 0; k < strings[j].length; k++)
 517                                         str[i++] = strings[j].c_str[k];
 518
 519                         return res;
 520                 }
 521
 522                 public static string Concat (params string[] values)
 523                 {
 524                         int len, i;
 525                         char[] str;
 526
 527                         if (values == null)
 528                                 throw new ArgumentNullException ();
 529
 530                         len = 0;
 531                         foreach (string value in values)
 532                                 len += value != null ? value.Length : 0;
 533
 534                         if (len == 0)
 535                                 return String.Empty;
 536
 537                         String res = new String (len);
 538                         str = res.c_str;
 539                         i = 0;
 540                         foreach (string value in values) {
 541                                 if (value == null)
 542                                         continue;
 543
 544                                 for (int j = 0; j < value.length; j++)
 545                                         str[i++] = value.c_str[j];
 546                         }
 547
 548                         return res;
 549                 }
 550
 551                 public static string Concat (object arg0, object arg1)
 552                 {
 553                         string str0 = arg0 != null ? arg0.ToString () : String.Empty;
 554                         string str1 = arg1 != null ? arg1.ToString () : String.Empty;
 555
 556                         return Concat (str0, str1);
 557                 }
 558
 559                 public static string Concat (string str0, string str1)
 560                 {
 561                         char[] concat;
 562                         int i, j, len;
 563
 564                         if (str0 == null)
 565                                 str0 = String.Empty;
 566                         if (str1 == null)
 567                                 str1 = String.Empty;
 568
 569                         len = str0.length + str1.length;
 570                         if (len == 0)
 571                                 return String.Empty;
 572
 573                         String res = new String (len);
 574
 575                         concat = res.c_str;
 576                         for (i = 0; i < str0.length; i++)
 577                                 concat[i] = str0.c_str[i];
 578                         for (j = 0 ; j < str1.length; j++)
 579                                 concat[i + j] = str1.c_str[j];
 580
 581                         return res;
 582                 }
 583
 584                 public static string Concat (object arg0, object arg1, object arg2)
 585                 {
 586                         string str0 = arg0 != null ? arg0.ToString () : String.Empty;
 587                         string str1 = arg1 != null ? arg1.ToString () : String.Empty;
 588                         string str2 = arg2 != null ? arg2.ToString () : String.Empty;
 589
 590                         return Concat (str0, str1, str2);
 591                 }
 592
 593                 public static string Concat (string str0, string str1, string str2)
 594                 {
 595                         char[] concat;
 596                         int i, j, k, len;
 597
 598                         if (str0 == null)
 599                                 str0 = String.Empty;
 600                         if (str1 == null)
 601                                 str1 = String.Empty;
 602                         if (str2 == null)
 603                                 str2 = String.Empty;
 604
 605                         len = str0.length + str1.length + str2.length;
 606                         if (len == 0)
 607                                 return String.Empty;
 608
 609                         String res = new String (len);
 610
 611                         concat = res.c_str;
 612                         for (i = 0; i < str0.length; i++)
 613                                 concat[i] = str0.c_str[i];
 614                         for (j = 0; j < str1.length; j++)
 615                                 concat[i + j] = str1.c_str[j];
 616                         for (k = 0; k < str2.length; k++)
 617                                 concat[i + j + k] = str2.c_str[k];
 618
 619                         return res;
 620                 }
 621
 622                 public static string Concat (string str0, string str1, string str2, string str3)
 623                 {
 624                         char[] concat;
 625                         int i, j, k, l, len;
 626
 627                         if (str0 == null)
 628                                 str0 = String.Empty;
 629                         if (str1 == null)
 630                                 str1 = String.Empty;
 631                         if (str2 == null)
 632                                 str2 = String.Empty;
 633                         if (str3 == null)
 634                                 str3 = String.Empty;
 635
 636                         len = str0.length + str1.length + str2.length + str3.length;
 637                         if (len == 0)
 638                                 return String.Empty;
 639                         String res = new String (len);
 640
 641                         concat = res.c_str;
 642                         for (i = 0; i < str0.length; i++)
 643                                 concat[i] = str0.c_str[i];
 644                         for (j = 0; j < str1.length; j++)
 645                                 concat[i + j] = str1.c_str[j];
 646                         for (k = 0; k < str2.length; k++)
 647                                 concat[i + j + k] = str2.c_str[k];
 648                         for (l = 0; l < str3.length; l++)
 649                                 concat[i + j + k + l] = str3.c_str[l];
 650
 651                         return res;
 652                 }
 653
 654                 public static string Copy (string str)
 655                 {
 656                         // FIXME: how do I *copy* a string if I can only have 1 of each?
 657                         if (str == null)
 658                                 throw new ArgumentNullException ();
 659
 660                         return str;
 661                 }
 662
 663                 public void CopyTo (int sourceIndex, char[] destination, int destinationIndex, int count)
 664                 {
 665                         // LAMESPEC: should I null-terminate?
 666                         int i;
 667
 668                         if (destination == null)
 669                                 throw new ArgumentNullException ();
 670
 671                         if (sourceIndex < 0 || destinationIndex < 0 || count < 0)
 672                                 throw new ArgumentOutOfRangeException ();
 673
 674                         if (sourceIndex + count > this.length)
 675                                 throw new ArgumentOutOfRangeException ();
 676
 677                         if (destinationIndex + count > destination.Length)
 678                                 throw new ArgumentOutOfRangeException ();
 679
 680                         for (i = 0; i < count; i++)
 681                                 destination[destinationIndex + i] = this.c_str[sourceIndex + i];
 682                 }
 683
 684                 public bool EndsWith (string value)
 685                 {
 686                         bool endswith = true;
 687                         int start, i;
 688
 689                         if (value == null)
 690                                 throw new ArgumentNullException ();
 691
 692                         start = this.length - value.length;
 693                         if (start < 0)
 694                                 return false;
 695
 696                         for (i = start; i < this.length && endswith; i++)
 697                                 endswith = this.c_str[i] == value.c_str[i - start];
 698
 699                         return endswith;
 700                 }
 701
 702                 public override bool Equals (object obj)
 703                 {
 704                         if (!(obj is String))
 705                                 return false;
 706
 707                         return this == (String) obj;
 708                 }
 709
 710                 public bool Equals (string value)
 711                 {
 712                         return this == value;
 713                 }
 714
 715                 public static bool Equals (string a, string b)
 716                 {
 717                         return a == b;
 718                 }
 719
 720                 [MonoTODO]
 721                 public static string Format (string format, object arg0)
 722                 {
 723                         // FIXME: implement me
 724                         return null;
 725                 }
 726
 727                 [MonoTODO]
 728                 public static string Format (string format, params object[] args)
 729                 {
 730                         // FIXME: implement me
 731                         return null;
 732                 }
 733
 734                 [MonoTODO]
 735                 public static string Format (IFormatProvider provider, string format, params object[] args)
 736                 {
 737                         // FIXME: implement me
 738                         return null;
 739                 }
 740
 741                 [MonoTODO]
 742                 public static string Format (string format, object arg0, object arg1)
 743                 {
 744                         // FIXME: implement me
 745                         return null;
 746                 }
 747
 748                 [MonoTODO]
 749                 public static string Format (string format, object arg0, object arg1, object arg2)
 750                 {
 751                         // FIXME: implement me
 752                         return null;
 753                 }
 754
 755                 //public CharEnumerator GetEnumerator ()
 756                 [MonoTODO]
 757                 public IEnumerator GetEnumerator ()
 758                 {
 759                         // FIXME: implement me
 760                         return null;
 761                 }
 762
 763                 public override int GetHashCode ()
 764                 {
 765                         int h = 0;
 766                         int i;
 767                         for (i = 0; i < length; ++i)
 768                                 h = (h << 5) - h + c_str [i];
 769                         return h;
 770                 }
 771
 772                 public TypeCode GetTypeCode ()
 773                 {
 774                         return TypeCode.String;
 775                 }
 776
 777                 public int IndexOf (char value)
 778                 {
 779                         return IndexOf (value, 0, this.length);
 780                 }
 781
 782                 public int IndexOf (string value)
 783                 {
 784                         return IndexOf (value, 0, this.length);
 785                 }
 786
 787                 public int IndexOf (char value, int startIndex)
 788                 {
 789                         return IndexOf (value, startIndex, this.length - startIndex);
 790                 }
 791
 792                 public int IndexOf (string value, int startIndex)
 793                 {
 794                         return IndexOf (value, startIndex, this.length - startIndex);
 795                 }
 796
 797                 public int IndexOf (char value, int startIndex, int count)
 798                 {
 799                         int i;
 800
 801                         if (startIndex < 0 || count < 0 || startIndex + count > this.length)
 802                                 throw new ArgumentOutOfRangeException ();
 803
 804                         for (i = startIndex; i - startIndex < count; i++)
 805                                 if (this.c_str[i] == value)
 806                                         return i;
 807
 808                         return -1;
 809                 }
 810
 811                 public int IndexOf (string value, int startIndex, int count)
 812                 {
 813                         if (value == null)
 814                                 throw new ArgumentNullException ();
 815
 816                         if (startIndex < 0 || count < 0 || startIndex + count > this.length)
 817                                 throw new ArgumentOutOfRangeException ();
 818
 819                         return BoyerMoore (this.c_str, value, startIndex, count);
 820 #if XXX
 821                         int i;
 822                         for (i = startIndex; i - startIndex + value.Length <= count; ) {
 823                                 if (this.c_str[i] == value[0]) {
 824                                         bool equal = true;
 825                                         int j, nexti = 0;
 826
 827                                         for (j = 1; equal && j < value.Length; j++) {
 828                                                 equal = this.c_str[i + j] == value[j];
 829                                                 if (this.c_str[i + j] == value[0] && nexti == 0)
 830                                                         nexti = i + j;
 831                                         }
 832
 833                                         if (equal)
 834                                                 return i;
 835
 836                                         if (nexti != 0)
 837                                                 i = nexti;
 838                                         else
 839                                                 i += j;
 840                                 } else
 841                                         i++;
 842                         }
 843
 844                         return -1;
 845 #endif
 846                 }
 847
 848                 public int IndexOfAny (char[] values)
 849                 {
 850                         return IndexOfAny (values, 0, this.length);
 851                 }
 852
 853                 public int IndexOfAny (char[] values, int startIndex)
 854                 {
 855                         return IndexOfAny (values, startIndex, this.length - startIndex);
 856                 }
 857
 858                 public int IndexOfAny (char[] values, int startIndex, int count)
 859                 {
 860                         if (values == null)
 861                                 throw new ArgumentNullException ();
 862
 863                         if (startIndex < 0 || count < 0 || startIndex + count > this.length)
 864                                 throw new ArgumentOutOfRangeException ();
 865
 866                         for (int i = startIndex; i < startIndex + count; i++) {
 867                                 for (int j = 0; j < strlen (values); j++) {
 868                                         if (this.c_str[i] == values[j])
 869                                                 return i;
 870                                 }
 871                         }
 872
 873                         return -1;
 874                 }
 875
 876                 public string Insert (int startIndex, string value)
 877                 {
 878                         char[] str;
 879                         int i, j;
 880
 881                         if (value == null)
 882                                 throw new ArgumentNullException ();
 883
 884                         if (startIndex < 0 || startIndex > this.length)
 885                                 throw new ArgumentOutOfRangeException ();
 886
 887                         String res = new String (value.length + this.length);
 888
 889                         str = res.c_str;
 890                         for (i = 0; i < startIndex; i++)
 891                                 str[i] = this.c_str[i];
 892                         for (j = 0; j < value.length; j++)
 893                                 str[i + j] = value.c_str[j];
 894                         for ( ; i < this.length; i++)
 895                                 str[i + j] = this.c_str[i];
 896
 897                         return res;
 898                 }
 899
 900                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 901                 public extern static string Intern (string str);
 902
 903                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 904                 public extern static string IsInterned (string str);
 905
 906                 public static string Join (string separator, string[] value)
 907                 {
 908                         return Join (separator, value, 0, value.Length);
 909                 }
 910
 911                 public static string Join (string separator, string[] value, int startIndex, int count)
 912                 {
 913                         // LAMESPEC: msdn doesn't specify what happens when separator is null
 914                         int len, i, j, used;
 915                         char[] str;
 916
 917                         if (separator == null || value == null)
 918                                 throw new ArgumentNullException ();
 919
 920                         if (startIndex + count > value.Length)
 921                                 throw new ArgumentOutOfRangeException ();
 922
 923                         len = 0;
 924                         for (i = startIndex, used = 0; used < count; i++, used++) {
 925                                 if (i != startIndex)
 926                                         len += separator.length;
 927
 928                                 len += value[i].length;
 929                         }
 930
 931                         // We have no elements to join?
 932                         if (i == startIndex)
 933                                 return String.Empty;
 934
 935                         String res = new String (len);
 936
 937                         str = res.c_str;
 938                         for (i = 0; i < value[startIndex].length; i++)
 939                                 str[i] = value[startIndex][i];
 940
 941                         used = 1;
 942                         for (j = startIndex + 1; used < count; j++, used++) {
 943                                 int k;
 944
 945                                 for (k = 0; k < separator.length; k++)
 946                                         str[i++] = separator.c_str[k];
 947                                 for (k = 0; k < value[j].length; k++)
 948                                         str[i++] = value[j].c_str[k];
 949                         }
 950
 951                         return res;
 952                 }
 953
 954                 public int LastIndexOf (char value)
 955                 {
 956                         int i = this.length;
 957                         if (i == 0)
 958                                 return -1;
 959                         --i;
 960                         for (; i >= 0; i--) {
 961                                 if (this.c_str[i] == value)
 962                                         return i;
 963                         }
 964
 965                         return -1;
 966                 }
 967
 968                 public int LastIndexOf (string value)
 969                 {
 970                         return LastIndexOf (value, this.length, this.length);
 971                 }
 972
 973                 public int LastIndexOf (char value, int startIndex)
 974                 {
 975                         if (startIndex < 0 || startIndex > this.length)
 976                                 throw new ArgumentOutOfRangeException ();
 977
 978                         for (int i = startIndex; i >= 0; i--) {
 979                                 if (this.c_str[i] == value)
 980                                         return i;
 981                         }
 982
 983                         return -1;
 984                 }
 985
 986                 public int LastIndexOf (string value, int startIndex)
 987                 {
 988                         return LastIndexOf (value, startIndex, this.length);
 989                 }
 990
 991                 public int LastIndexOf (char value, int startIndex, int count)
 992                 {
 993                         if (startIndex < 0 || count < 0)
 994                                 throw new ArgumentOutOfRangeException ();
 995
 996                         if (startIndex > this.length || startIndex - count < 0)
 997                                 throw new ArgumentOutOfRangeException ();
 998
 999                         for (int i = startIndex; i >= startIndex - count; i--) {
1000                                 if (this.c_str[i] == value)
1001                                         return i;
1002                         }
1003
1004                         return -1;
1005                 }
1006
1007                 public int LastIndexOf (string value, int startIndex, int count)
1008                 {
1009                         // LAMESPEC: currently I'm using startIndex as the 0-position in the comparison,
1010                         //           but maybe it's the end-position in MS's implementation?
1011                         //           msdn is unclear on this point. I think this is correct though.
1012                         int i, len;
1013
1014                         if (value == null)
1015                                 throw new ArgumentNullException ();
1016
1017                         if (startIndex < 0 || startIndex > this.length)
1018                                 throw new ArgumentOutOfRangeException ();
1019
1020                         if (count < 0 || startIndex - count < 0)
1021                                 throw new ArgumentOutOfRangeException ();
1022
1023                         if (value == String.Empty)
1024                                 return startIndex;
1025
1026                         if (startIndex + value.length > this.length) {
1027                                 /* just a little optimization */
1028                                 int start;
1029
1030                                 start = this.length - value.length;
1031                                 count -= startIndex - start;
1032                                 startIndex = start;
1033                         }
1034
1035                         // FIXME: use a reversed-unicode-safe-Boyer-Moore?
1036                         len = value.length - 1;
1037                         for (i = startIndex; i >= startIndex - count; i--) {
1038                                 if (this.c_str[i + len] == value.c_str[len]) {
1039                                         bool equal = true;
1040                                         int j;
1041
1042                                         for (j = len - 1; equal && j >= 0; j--)
1043                                                 equal = this.c_str[i + j] == value.c_str[j];
1044
1045                                         if (equal)
1046                                                 return i;
1047                                 }
1048                         }
1049
1050                         return -1;
1051                 }
1052
1053                 public int LastIndexOfAny (char[] values)
1054                 {
1055                         return LastIndexOfAny (values, this.length, this.length);
1056                 }
1057
1058                 public int LastIndexOfAny (char[] values, int startIndex)
1059                 {
1060                         return LastIndexOfAny (values, startIndex, startIndex);
1061                 }
1062
1063                 public int LastIndexOfAny (char[] values, int startIndex, int count)
1064                 {
1065                         int i;
1066
1067                         if (values == null)
1068                                 throw new ArgumentNullException ();
1069
1070                         if (startIndex < 0 || count < 0 || startIndex - count < 0)
1071                                 throw new ArgumentOutOfRangeException ();
1072
1073                         for (i = startIndex; i >= startIndex - count; i--) {
1074                                 for (int j = 0; j < strlen (values); j++) {
1075                                         if (this.c_str[i] == values[j])
1076                                                 return i;
1077                                 }
1078                         }
1079
1080                         return -1;
1081                 }
1082
1083                 public string PadLeft (int totalWidth)
1084                 {
1085                         return PadLeft (totalWidth, ' ');
1086                 }
1087
1088                 public string PadLeft (int totalWidth, char padChar)
1089                 {
1090                         char[] str;
1091                         int i, j;
1092
1093                         if (totalWidth < 0)
1094                                 throw new ArgumentException ();
1095
1096                         str = new char [totalWidth > this.length ? totalWidth : this.length];
1097                         for (i = 0; i < totalWidth - this.length; i++)
1098                                 str[i] = padChar;
1099
1100                         for (j = 0; j < this.length; i++, j++)
1101                                 str[i] = this.c_str[j];
1102
1103                         return new String (str);
1104                 }
1105
1106                 public string PadRight (int totalWidth)
1107                 {
1108                         return PadRight (totalWidth, ' ');
1109                 }
1110
1111                 public string PadRight (int totalWidth, char padChar)
1112                 {
1113                         char[] str;
1114                         int i;
1115
1116                         if (totalWidth < 0)
1117                                 throw new ArgumentException ();
1118
1119                         str = new char [totalWidth > this.length ? totalWidth : this.length];
1120                         for (i = 0; i < this.length; i++)
1121                                 str[i] = this.c_str[i];
1122
1123                         for ( ; i < str.Length; i++)
1124                                 str[i] = padChar;
1125
1126                         return new String (str);
1127                 }
1128
1129                 public string Remove (int startIndex, int count)
1130                 {
1131                         char[] str;
1132                         int i, j, len;
1133
1134                         if (startIndex < 0 || count < 0 || startIndex + count > this.length)
1135                                 throw new ArgumentOutOfRangeException ();
1136
1137                         len = this.length - count;
1138                         if (len == 0)
1139                                 return String.Empty;
1140
1141                         String res = new String (len);
1142                         str = res.c_str;
1143                         for (i = 0; i < startIndex; i++)
1144                                 str[i] = this.c_str[i];
1145                         for (j = i + count; j < this.length; j++)
1146                                 str[i++] = this.c_str[j];
1147
1148                         return res;
1149                 }
1150
1151                 public string Replace (char oldChar, char newChar)
1152                 {
1153                         char[] str;
1154                         int i;
1155
1156                         String res = new String (length);
1157                         str = res.c_str;
1158                         for (i = 0; i < this.length; i++) {
1159                                 if (this.c_str[i] == oldChar)
1160                                         str[i] = newChar;
1161                                 else
1162                                         str[i] = this.c_str[i];
1163                         }
1164
1165                         return res;
1166                 }
1167
1168                 public string Replace (string oldValue, string newValue)
1169                 {
1170                         // LAMESPEC: msdn doesn't specify what to do if either args is null
1171                         int index, len, i, j;
1172                         char[] str;
1173
1174                         if (oldValue == null || newValue == null)
1175                                 throw new ArgumentNullException ();
1176
1177                         // Use IndexOf in case I later rewrite it to use Boyer-Moore
1178                         index = IndexOf (oldValue, 0);
1179                         if (index == -1) {
1180                                 // This is the easy one ;-)
1181                                 return Substring (0, this.length);
1182                         }
1183
1184                         len = this.length - oldValue.length + newValue.length;
1185                         if (len == 0)
1186                                 return String.Empty;
1187
1188                         String res = new String (len);
1189                         str = res.c_str;
1190                         for (i = 0; i < index; i++)
1191                                 str[i] = this.c_str[i];
1192                         for (j = 0; j < newValue.length; j++)
1193                                 str[i++] = newValue[j];
1194                         for (j = index + oldValue.length; j < this.length; j++)
1195                                 str[i++] = this.c_str[j];
1196
1197                         return res;
1198                 }
1199
1200                 private int splitme (char[] separators, int startIndex)
1201                 {
1202                         /* this is basically a customized IndexOfAny() for the Split() methods */
1203                         for (int i = startIndex; i < this.length; i++) {
1204                                 if (separators != null) {
1205                                         foreach (char sep in separators) {
1206                                                 if (this.c_str[i] == sep)
1207                                                         return i - startIndex;
1208                                         }
1209                                 } else if (is_lwsp (this.c_str[i])) {
1210                                         return i - startIndex;
1211                                 }
1212                         }
1213
1214                         return -1;
1215                 }
1216
1217                 public string[] Split (params char[] separator)
1218                 {
1219                         /**
1220                          * split:
1221                          * @separator: delimiting chars or null to split on whtspc
1222                          *
1223                          * Returns: 1. An array consisting of a single
1224                          * element (@this) if none of the delimiting
1225                          * chars appear in @this. 2. An array of
1226                          * substrings which are delimited by one of
1227                          * the separator chars. 3. An array of
1228                          * substrings separated by whitespace if
1229                          * @separator is null. The Empty string should
1230                          * be returned wherever 2 delimiting chars are
1231                          * adjacent.
1232                          **/
1233                         // FIXME: would using a Queue be better?
1234                         string[] strings;
1235                         ArrayList list;
1236                         int index, len;
1237
1238                         list = new ArrayList ();
1239                         for (index = 0, len = 0; index < this.length; index += len + 1) {
1240                                 len = splitme (separator, index);
1241                                 len = len > -1 ? len : this.length - index;
1242                                 if (len == 0) {
1243                                         list.Add (String.Empty);
1244                                 } else {
1245                                         char[] str;
1246                                         int i;
1247
1248                                         str = new char [len];
1249                                         for (i = 0; i < len; i++)
1250                                                 str[i] = this.c_str[index + i];
1251
1252                                         list.Add (new String (str));
1253                                 }
1254                         }
1255
1256                         strings = new string [list.Count];
1257                         if (list.Count == 1) {
1258                                 /* special case for an array holding @this */
1259                                 strings[0] = this;
1260                         } else {
1261                                 for (index = 0; index < list.Count; index++)
1262                                         strings[index] = (string) list[index];
1263                         }
1264
1265                         return strings;
1266                 }
1267
1268                 public string[] Split (char[] separator, int maxCount)
1269                 {
1270                         // FIXME: what to do if maxCount <= 0?
1271                         // FIXME: would using Queue be better than ArrayList?
1272                         string[] strings;
1273                         ArrayList list;
1274                         int index, len, used;
1275
1276                         used = 0;
1277                         list = new ArrayList ();
1278                         for (index = 0, len = 0; index < this.length && used < maxCount; index += len + 1) {
1279                                 len = splitme (separator, index);
1280                                 len = len > -1 ? len : this.length - index;
1281                                 if (len == 0) {
1282                                         list.Add (String.Empty);
1283                                 } else {
1284                                         char[] str;
1285                                         int i;
1286
1287                                         str = new char [len];
1288                                         for (i = 0; i < len; i++)
1289                                                 str[i] = this.c_str[index + i];
1290
1291                                         list.Add (new String (str));
1292                                 }
1293                                 used++;
1294                         }
1295
1296                         /* fit the remaining chunk of the @this into it's own element */
1297                         if (index != this.length) {
1298                                 char[] str;
1299                                 int i;
1300
1301                                 str = new char [this.length - index];
1302                                 for (i = index; i < this.length; i++)
1303                                         str[i - index] = this.c_str[i];
1304
1305                                 list.Add (new String (str));
1306                         }
1307
1308                         strings = new string [list.Count];
1309                         if (list.Count == 1) {
1310                                 /* special case for an array holding @this */
1311                                 strings[0] = this;
1312                         } else {
1313                                 for (index = 0; index < list.Count; index++)
1314                                         strings[index] = (string) list[index];
1315                         }
1316
1317                         return strings;
1318                 }
1319
1320                 public bool StartsWith (string value)
1321                 {
1322                         bool startswith = true;
1323                         int i;
1324
1325                         if (value == null)
1326                                 throw new ArgumentNullException ();
1327
1328                         if (value.length > this.length)
1329                                 return false;
1330
1331                         for (i = 0; i < value.length && startswith; i++)
1332                                 startswith = startswith && value.c_str[i] == this.c_str[i];
1333
1334                         return startswith;
1335                 }
1336
1337                 public string Substring (int startIndex)
1338                 {
1339                         char[] str;
1340                         int i, len;
1341
1342                         if (startIndex < 0 || startIndex > this.length)
1343                                 throw new ArgumentOutOfRangeException ();
1344
1345                         len = this.length - startIndex;
1346                         if (len == 0)
1347                                 return String.Empty;
1348                         String res = new String (len);
1349                         str = res.c_str;
1350                         for (i = startIndex; i < this.length; i++)
1351                                 str[i - startIndex] = this.c_str[i];
1352
1353                         return res;
1354                 }
1355
1356                 public string Substring (int startIndex, int length)
1357                 {
1358                         char[] str;
1359                         int i;
1360
1361                         if (startIndex < 0 || length < 0 || startIndex + length > this.length)
1362                                 throw new ArgumentOutOfRangeException ();
1363
1364                         if (length == 0)
1365                                 return String.Empty;
1366
1367                         String res = new String (length);
1368                         str = res.c_str;
1369                         for (i = startIndex; i < startIndex + length; i++)
1370                                 str[i - startIndex] = this.c_str[i];
1371
1372                         return res;
1373                 }
1374
1375                 [MonoTODO]
1376                 public bool ToBoolean (IFormatProvider provider)
1377                 {
1378                         // FIXME: implement me
1379                         throw new NotImplementedException ();
1380                 }
1381
1382                 [MonoTODO]
1383                 public byte ToByte (IFormatProvider provider)
1384                 {
1385                         // FIXME: implement me
1386                         throw new NotImplementedException ();
1387                 }
1388
1389                 [MonoTODO]
1390                 public char ToChar (IFormatProvider provider)
1391                 {
1392                         // FIXME: implement me
1393                         throw new NotImplementedException ();
1394                 }
1395
1396                 public char[] ToCharArray ()
1397                 {
1398                         return ToCharArray (0, this.length);
1399                 }
1400
1401                 public char[] ToCharArray (int startIndex, int length)
1402                 {
1403                         char[] chars;
1404                         int i;
1405
1406                         if (startIndex < 0 || length < 0 || startIndex + length > this.length)
1407                                 throw new ArgumentOutOfRangeException ();
1408
1409                         chars = new char [length];
1410                         for (i = startIndex; i < length; i++)
1411                                 chars[i - startIndex] = this.c_str[i];
1412
1413                         return chars;
1414                 }
1415
1416                 [MonoTODO]
1417                 public DateTime ToDateTime (IFormatProvider provider)
1418                 {
1419                         // FIXME: implement me
1420                         // return new DateTime (0);
1421                         throw new NotImplementedException ();
1422                 }
1423
1424                 [MonoTODO]
1425                 public decimal ToDecimal (IFormatProvider provider)
1426                 {
1427                         // FIXME: implement me
1428                         throw new NotImplementedException ();
1429                 }
1430
1431                 [MonoTODO]
1432                 public double ToDouble (IFormatProvider provider)
1433                 {
1434                         // FIXME: implement me
1435                         throw new NotImplementedException ();
1436                 }
1437
1438                 [MonoTODO]
1439                 public short ToInt16 (IFormatProvider provider)
1440                 {
1441                         // FIXME: implement me
1442                         throw new NotImplementedException ();
1443                 }
1444
1445                 [MonoTODO]
1446                 public int ToInt32 (IFormatProvider provider)
1447                 {
1448                         // FIXME: implement me
1449                         throw new NotImplementedException ();
1450                 }
1451
1452                 [MonoTODO]
1453                 public long ToInt64 (IFormatProvider provider)
1454                 {
1455                         // FIXME: implement me
1456                         throw new NotImplementedException ();
1457                 }
1458
1459                 public string ToLower ()
1460                 {
1461                         char[] str;
1462                         int i;
1463
1464                         String res = new String (length);
1465                         str = res.c_str;
1466                         for (i = 0; i < this.length; i++)
1467                                 str[i] = Char.ToLower (this.c_str[i]);
1468
1469                         return res;
1470                 }
1471
1472                 [MonoTODO]
1473                 public string ToLower (CultureInfo culture)
1474                 {
1475                         // FIXME: implement me
1476                         throw new NotImplementedException ();
1477
1478                 }
1479
1480                 [CLSCompliant(false)][MonoTODO]
1481                 public sbyte ToSByte (IFormatProvider provider)
1482                 {
1483                         // FIXME: implement me
1484                         throw new NotImplementedException ();
1485                 }
1486
1487                 [MonoTODO]
1488                 public float ToSingle (IFormatProvider provider)
1489                 {
1490                         // FIXME: implement me
1491                         throw new NotImplementedException ();
1492                 }
1493
1494                 public override string ToString ()
1495                 {
1496                         return this;
1497                 }
1498
1499                 [MonoTODO]
1500                 public string ToString (IFormatProvider format)
1501                 {
1502                         // FIXME: implement me
1503                         throw new NotImplementedException ();
1504                 }
1505
1506                 [MonoTODO]
1507                 public object ToType (Type conversionType, IFormatProvider provider)
1508                 {
1509                         // FIXME: implement me
1510                         throw new NotImplementedException ();
1511                 }
1512
1513                 [CLSCompliant(false)][MonoTODO]
1514                 public ushort ToUInt16 (IFormatProvider provider)
1515                 {
1516                         // FIXME: implement me
1517                         throw new NotImplementedException ();
1518                 }
1519
1520                 [CLSCompliant(false)][MonoTODO]
1521                 public uint ToUInt32 (IFormatProvider provider)
1522                 {
1523                         // FIXME: implement me
1524                         throw new NotImplementedException ();
1525                 }
1526
1527                 [CLSCompliant(false)][MonoTODO]
1528                 public ulong ToUInt64 (IFormatProvider provider)
1529                 {
1530                         // FIXME: implement me
1531                         throw new NotImplementedException ();
1532                 }
1533
1534                 public string ToUpper ()
1535                 {
1536                         char[] str;
1537                         int i;
1538
1539                         String res = new String (length);
1540                         str = res.c_str;
1541                         for (i = 0; i < this.length; i++)
1542                                 str[i] = Char.ToUpper (this.c_str[i]);
1543
1544                         return res;
1545                 }
1546
1547                 [MonoTODO]
1548                 public string ToUpper (CultureInfo culture)
1549                 {
1550                         // FIXME: implement me
1551                         throw new NotImplementedException ();
1552                 }
1553
1554                 public string Trim ()
1555                 {
1556                         return Trim (null);
1557                 }
1558
1559                 public string Trim (params char[] trimChars)
1560                 {
1561                         int begin, end;
1562                         bool matches;
1563
1564                         matches = true;
1565                         for (begin = 0; matches && begin < this.length; begin++) {
1566                                 if (trimChars != null) {
1567                                         matches = false;
1568                                         foreach (char c in trimChars) {
1569                                                 matches = this.c_str[begin] == c;
1570                                                 if (matches)
1571                                                         break;
1572                                         }
1573                                 } else {
1574                                         matches = is_lwsp (this.c_str[begin]);
1575                                 }
1576                         }
1577
1578                         matches = true;
1579                         for (end = this.length - 1; matches && end > begin; end--) {
1580                                 if (trimChars != null) {
1581                                         matches = false;
1582                                         foreach (char c in trimChars) {
1583                                                 matches = this.c_str[end] == c;
1584                                                 if (matches)
1585                                                         break;
1586                                         }
1587                                 } else {
1588                                         matches = is_lwsp (this.c_str[end]);
1589                                 }
1590                         }
1591
1592                         if (begin >= end)
1593                                 return String.Empty;
1594
1595                         return Substring (begin, end - begin);
1596                 }
1597
1598                 public string TrimEnd (params char[] trimChars)
1599                 {
1600                         bool matches = true;
1601                         int end;
1602
1603                         for (end = this.length; end > 0; end--) {
1604                                 if (trimChars != null) {
1605                                         matches = false;
1606                                         foreach (char c in trimChars) {
1607                                                 matches = this.c_str[end] == c;
1608                                                 if (matches)
1609                                                         break;
1610                                         }
1611                                 } else {
1612                                         matches = is_lwsp (this.c_str[end]);
1613                                 }
1614                         }
1615
1616                         if (end == 0)
1617                                 return String.Empty;
1618
1619                         return Substring (0, end);
1620                 }
1621
1622                 public string TrimStart (params char[] trimChars)
1623                 {
1624                         bool matches = true;
1625                         int begin;
1626
1627                         for (begin = 0; matches && begin < this.length; begin++) {
1628                                 if (trimChars != null) {
1629                                         matches = false;
1630                                         foreach (char c in trimChars) {
1631                                                 matches = this.c_str[begin] == c;
1632                                                 if (matches)
1633                                                         break;
1634                                         }
1635                                 } else {
1636                                         matches = is_lwsp (this.c_str[begin]);
1637                                 }
1638                         }
1639
1640                         if (begin == this.length)
1641                                 return String.Empty;
1642
1643                         return Substring (begin, this.length - begin);
1644                 }
1645
1646                 // Operators
1647                 public static bool operator ==(string a, string b)
1648                 {
1649                         if (a.length != b.length)
1650                                 return false;
1651
1652                         int l = a.length;
1653                         for (int i = 0; i < l; i++)
1654                                 if (a.c_str[i] != b.c_str[i])
1655                                         return false;
1656
1657                         return true;
1658                 }
1659
1660                 public static bool operator !=(string a, string b)
1661                 {
1662                         return !(a == b);
1663                 }
1664         }
1665 }