contrib/src/stc/scintilla/src/Document.cxx

   1 // Scintilla source code edit control
   2 /** @file Document.cxx
   3  ** Text document that handles notifications, DBCS, styling, words and end of line.
   4  **/
   5 // Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <stdio.h>
  11 #include <ctype.h>
  12
  13 #include "Platform.h"
  14
  15 #include "Scintilla.h"
  16 #include "SVector.h"
  17 #include "CellBuffer.h"
  18 #include "Document.h"
  19 #include "RESearch.h"
  20
  21 // This is ASCII specific but is safe with chars >= 0x80
  22 inline bool isspacechar(unsigned char ch) {
  23         return (ch == ' ') || ((ch >= 0x09) && (ch <= 0x0d));
  24 }
  25
  26 Document::Document() {
  27         refCount = 0;
  28 #ifdef unix
  29         eolMode = SC_EOL_LF;
  30 #else
  31         eolMode = SC_EOL_CRLF;
  32 #endif
  33         dbcsCodePage = 0;
  34         stylingBits = 5;
  35         stylingBitsMask = 0x1F;
  36         stylingMask = 0;
  37         for (int ch = 0; ch < 256; ch++) {
  38                 wordchars[ch] = isalnum(ch) || ch == '_';
  39         }
  40         endStyled = 0;
  41         enteredCount = 0;
  42         enteredReadOnlyCount = 0;
  43         tabInChars = 8;
  44         indentInChars = 0;
  45         useTabs = true;
  46         tabIndents = true;
  47         backspaceUnindents = false;
  48         watchers = 0;
  49         lenWatchers = 0;
  50
  51         matchesValid = false;
  52         pre = 0;
  53         substituted = 0;
  54 }
  55
  56 Document::~Document() {
  57         for (int i = 0; i < lenWatchers; i++) {
  58                 watchers[i].watcher->NotifyDeleted(this, watchers[i].userData);
  59         }
  60         delete []watchers;
  61         watchers = 0;
  62         lenWatchers = 0;
  63         delete pre;
  64         pre = 0;
  65         delete []substituted;
  66         substituted = 0;
  67 }
  68
  69 // Increase reference count and return its previous value.
  70 int Document::AddRef() {
  71         return refCount++;
  72 }
  73
  74 // Decrease reference count and return its previous value.
  75 // Delete the document if reference count reaches zero.
  76 int Document::Release() {
  77         int curRefCount = --refCount;
  78         if (curRefCount == 0)
  79                 delete this;
  80         return curRefCount;
  81 }
  82
  83 void Document::SetSavePoint() {
  84         cb.SetSavePoint();
  85         NotifySavePoint(true);
  86 }
  87
  88 int Document::AddMark(int line, int markerNum) {
  89         int prev = cb.AddMark(line, markerNum);
  90         DocModification mh(SC_MOD_CHANGEMARKER, LineStart(line), 0, 0, 0);
  91         NotifyModified(mh);
  92         return prev;
  93 }
  94
  95 void Document::DeleteMark(int line, int markerNum) {
  96         cb.DeleteMark(line, markerNum);
  97         DocModification mh(SC_MOD_CHANGEMARKER, LineStart(line), 0, 0, 0);
  98         NotifyModified(mh);
  99 }
 100
 101 void Document::DeleteMarkFromHandle(int markerHandle) {
 102         cb.DeleteMarkFromHandle(markerHandle);
 103         DocModification mh(SC_MOD_CHANGEMARKER, 0, 0, 0, 0);
 104         NotifyModified(mh);
 105 }
 106
 107 void Document::DeleteAllMarks(int markerNum) {
 108         cb.DeleteAllMarks(markerNum);
 109         DocModification mh(SC_MOD_CHANGEMARKER, 0, 0, 0, 0);
 110         NotifyModified(mh);
 111 }
 112
 113 int Document::LineStart(int line) {
 114         return cb.LineStart(line);
 115 }
 116
 117 int Document::LineEnd(int line) {
 118         if (line == LinesTotal() - 1) {
 119                 return LineStart(line + 1);
 120         } else {
 121                 int position = LineStart(line + 1) - 1;
 122                 // When line terminator is CR+LF, may need to go back one more
 123                 if ((position > LineStart(line)) && (cb.CharAt(position - 1) == '\r')) {
 124                         position--;
 125                 }
 126                 return position;
 127         }
 128 }
 129
 130 int Document::LineFromPosition(int pos) {
 131         return cb.LineFromPosition(pos);
 132 }
 133
 134 int Document::LineEndPosition(int position) {
 135         return LineEnd(LineFromPosition(position));
 136 }
 137
 138 int Document::VCHomePosition(int position) {
 139         int line = LineFromPosition(position);
 140         int startPosition = LineStart(line);
 141         int endLine = LineStart(line + 1) - 1;
 142         int startText = startPosition;
 143         while (startText < endLine && (cb.CharAt(startText) == ' ' || cb.CharAt(startText) == '\t' ) )
 144                 startText++;
 145         if (position == startText)
 146                 return startPosition;
 147         else
 148                 return startText;
 149 }
 150
 151 int Document::SetLevel(int line, int level) {
 152         int prev = cb.SetLevel(line, level);
 153         if (prev != level) {
 154                 DocModification mh(SC_MOD_CHANGEFOLD | SC_MOD_CHANGEMARKER,
 155                                    LineStart(line), 0, 0, 0);
 156                 mh.line = line;
 157                 mh.foldLevelNow = level;
 158                 mh.foldLevelPrev = prev;
 159                 NotifyModified(mh);
 160         }
 161         return prev;
 162 }
 163
 164 static bool IsSubordinate(int levelStart, int levelTry) {
 165         if (levelTry & SC_FOLDLEVELWHITEFLAG)
 166                 return true;
 167         else
 168                 return (levelStart & SC_FOLDLEVELNUMBERMASK) < (levelTry & SC_FOLDLEVELNUMBERMASK);
 169 }
 170
 171 int Document::GetLastChild(int lineParent, int level) {
 172         if (level == -1)
 173                 level = GetLevel(lineParent) & SC_FOLDLEVELNUMBERMASK;
 174         int maxLine = LinesTotal();
 175         int lineMaxSubord = lineParent;
 176         while (lineMaxSubord < maxLine - 1) {
 177                 EnsureStyledTo(LineStart(lineMaxSubord + 2));
 178                 if (!IsSubordinate(level, GetLevel(lineMaxSubord + 1)))
 179                         break;
 180                 lineMaxSubord++;
 181         }
 182         if (lineMaxSubord > lineParent) {
 183                 if (level > (GetLevel(lineMaxSubord + 1) & SC_FOLDLEVELNUMBERMASK)) {
 184                         // Have chewed up some whitespace that belongs to a parent so seek back
 185                         if (GetLevel(lineMaxSubord) & SC_FOLDLEVELWHITEFLAG) {
 186                                 lineMaxSubord--;
 187                         }
 188                 }
 189         }
 190         return lineMaxSubord;
 191 }
 192
 193 int Document::GetFoldParent(int line) {
 194         int level = GetLevel(line);
 195         int lineLook = line - 1;
 196         while ((lineLook > 0) && (
 197                     (!(GetLevel(lineLook) & SC_FOLDLEVELHEADERFLAG)) ||
 198                     ((GetLevel(lineLook) & SC_FOLDLEVELNUMBERMASK) >= level))
 199               ) {
 200                 lineLook--;
 201         }
 202         if ((GetLevel(lineLook) & SC_FOLDLEVELHEADERFLAG) &&
 203                 ((GetLevel(lineLook) & SC_FOLDLEVELNUMBERMASK) < level)) {
 204                 return lineLook;
 205         } else {
 206                 return -1;
 207         }
 208 }
 209
 210 int Document::ClampPositionIntoDocument(int pos) {
 211         return Platform::Clamp(pos, 0, Length());
 212 }
 213
 214 bool Document::IsCrLf(int pos) {
 215         if (pos < 0)
 216                 return false;
 217         if (pos >= (Length() - 1))
 218                 return false;
 219         return (cb.CharAt(pos) == '\r') && (cb.CharAt(pos + 1) == '\n');
 220 }
 221
 222 #if PLAT_WIN
 223 bool Document::IsDBCS(int pos) {
 224         if (dbcsCodePage) {
 225                 if (SC_CP_UTF8 == dbcsCodePage) {
 226                         unsigned char ch = static_cast<unsigned char>(cb.CharAt(pos));
 227                         return ch >= 0x80;
 228                 } else {
 229                         // Anchor DBCS calculations at start of line because start of line can
 230                         // not be a DBCS trail byte.
 231                         int startLine = pos;
 232                         while (startLine > 0 && cb.CharAt(startLine) != '\r' && cb.CharAt(startLine) != '\n')
 233                                 startLine--;
 234                         while (startLine <= pos) {
 235                                 if (IsDBCSLeadByteEx(dbcsCodePage, cb.CharAt(startLine))) {
 236                                         startLine++;
 237                                         if (startLine >= pos)
 238                                                 return true;
 239                                 }
 240                                 startLine++;
 241                         }
 242                 }
 243         }
 244         return false;
 245 }
 246 #else
 247 // PLAT_GTK or PLAT_WX
 248 // TODO: support DBCS under GTK+ and WX
 249 bool Document::IsDBCS(int) {
 250         return false;
 251 }
 252 #endif
 253
 254 int Document::LenChar(int pos) {
 255         if (IsCrLf(pos)) {
 256                 return 2;
 257         } else if (SC_CP_UTF8 == dbcsCodePage) {
 258                 unsigned char ch = static_cast<unsigned char>(cb.CharAt(pos));
 259                 if (ch < 0x80)
 260                         return 1;
 261                 int len = 2;
 262                 if (ch >= (0x80 + 0x40 + 0x20))
 263                         len = 3;
 264                 int lengthDoc = Length();
 265                 if ((pos + len) > lengthDoc)
 266                         return lengthDoc -pos;
 267                 else
 268                         return len;
 269         } else if (IsDBCS(pos)) {
 270                 return 2;
 271         } else {
 272                 return 1;
 273         }
 274 }
 275
 276 // Normalise a position so that it is not halfway through a two byte character.
 277 // This can occur in two situations -
 278 // When lines are terminated with \r\n pairs which should be treated as one character.
 279 // When displaying DBCS text such as Japanese.
 280 // If moving, move the position in the indicated direction.
 281 int Document::MovePositionOutsideChar(int pos, int moveDir, bool checkLineEnd) {
 282         //Platform::DebugPrintf("NoCRLF %d %d\n", pos, moveDir);
 283         // If out of range, just return value - should be fixed up after
 284         if (pos < 0)
 285                 return pos;
 286         if (pos > Length())
 287                 return pos;
 288
 289         // Position 0 and Length() can not be between any two characters
 290         if (pos == 0)
 291                 return pos;
 292         if (pos == Length())
 293                 return pos;
 294
 295         // assert pos > 0 && pos < Length()
 296         if (checkLineEnd && IsCrLf(pos - 1)) {
 297                 if (moveDir > 0)
 298                         return pos + 1;
 299                 else
 300                         return pos - 1;
 301         }
 302
 303         // Not between CR and LF
 304
 305 #if PLAT_WIN
 306         if (dbcsCodePage) {
 307                 if (SC_CP_UTF8 == dbcsCodePage) {
 308                         unsigned char ch = static_cast<unsigned char>(cb.CharAt(pos));
 309                         while ((pos > 0) && (pos < Length()) && (ch >= 0x80) && (ch < (0x80 + 0x40))) {
 310                                 // ch is a trail byte
 311                                 if (moveDir > 0)
 312                                         pos++;
 313                                 else
 314                                         pos--;
 315                                 ch = static_cast<unsigned char>(cb.CharAt(pos));
 316                         }
 317                 } else {
 318                         // Anchor DBCS calculations at start of line because start of line can
 319                         // not be a DBCS trail byte.
 320                         int startLine = pos;
 321                         while (startLine > 0 && cb.CharAt(startLine) != '\r' && cb.CharAt(startLine) != '\n')
 322                                 startLine--;
 323                         bool atLeadByte = false;
 324                         while (startLine < pos) {
 325                                 if (atLeadByte)
 326                                         atLeadByte = false;
 327                                 else if (IsDBCSLeadByteEx(dbcsCodePage, cb.CharAt(startLine)))
 328                                         atLeadByte = true;
 329                                 else
 330                                         atLeadByte = false;
 331                                 startLine++;
 332                                 //Platform::DebugPrintf("DBCS %s\n", atlead ? "D" : "-");
 333                         }
 334
 335
 336                         if (atLeadByte) {
 337                                 // Position is between a lead byte and a trail byte
 338                                 if (moveDir > 0)
 339                                         return pos + 1;
 340                                 else
 341                                         return pos - 1;
 342                         }
 343                 }
 344         }
 345 #endif
 346
 347         return pos;
 348 }
 349
 350 void Document::ModifiedAt(int pos) {
 351         if (endStyled > pos)
 352                 endStyled = pos;
 353 }
 354
 355 // Document only modified by gateways DeleteChars, InsertStyledString, Undo, Redo, and SetStyleAt.
 356 // SetStyleAt does not change the persistent state of a document
 357
 358 // Unlike Undo, Redo, and InsertStyledString, the pos argument is a cell number not a char number
 359 void Document::DeleteChars(int pos, int len) {
 360         if ((pos + len) > Length())
 361                 return ;
 362         if (cb.IsReadOnly() && enteredReadOnlyCount == 0) {
 363                 enteredReadOnlyCount++;
 364                 NotifyModifyAttempt();
 365                 enteredReadOnlyCount--;
 366         }
 367         if (enteredCount == 0) {
 368                 enteredCount++;
 369                 if (!cb.IsReadOnly()) {
 370                         NotifyModified(
 371                             DocModification(
 372                                 SC_MOD_BEFOREDELETE | SC_PERFORMED_USER,
 373                                 pos, len,
 374                                 0, 0));
 375                         int prevLinesTotal = LinesTotal();
 376                         bool startSavePoint = cb.IsSavePoint();
 377                         const char *text = cb.DeleteChars(pos * 2, len * 2);
 378                         if (startSavePoint && cb.IsCollectingUndo())
 379                                 NotifySavePoint(!startSavePoint);
 380                         if ((pos < Length()) || (pos == 0))
 381                                 ModifiedAt(pos);
 382                         else
 383                                 ModifiedAt(pos-1);
 384                         NotifyModified(
 385                             DocModification(
 386                                 SC_MOD_DELETETEXT | SC_PERFORMED_USER,
 387                                 pos, len,
 388                                 LinesTotal() - prevLinesTotal, text));
 389                 }
 390                 enteredCount--;
 391         }
 392 }
 393
 394 void Document::InsertStyledString(int position, char *s, int insertLength) {
 395         if (cb.IsReadOnly() && enteredReadOnlyCount == 0) {
 396                 enteredReadOnlyCount++;
 397                 NotifyModifyAttempt();
 398                 enteredReadOnlyCount--;
 399         }
 400         if (enteredCount == 0) {
 401                 enteredCount++;
 402                 if (!cb.IsReadOnly()) {
 403                         NotifyModified(
 404                             DocModification(
 405                                 SC_MOD_BEFOREINSERT | SC_PERFORMED_USER,
 406                                 position / 2, insertLength / 2,
 407                                 0, 0));
 408                         int prevLinesTotal = LinesTotal();
 409                         bool startSavePoint = cb.IsSavePoint();
 410                         const char *text = cb.InsertString(position, s, insertLength);
 411                         if (startSavePoint && cb.IsCollectingUndo())
 412                                 NotifySavePoint(!startSavePoint);
 413                         ModifiedAt(position / 2);
 414                         NotifyModified(
 415                             DocModification(
 416                                 SC_MOD_INSERTTEXT | SC_PERFORMED_USER,
 417                                 position / 2, insertLength / 2,
 418                                 LinesTotal() - prevLinesTotal, text));
 419                 }
 420                 enteredCount--;
 421         }
 422 }
 423
 424 int Document::Undo() {
 425         int newPos = 0;
 426         if (enteredCount == 0) {
 427                 enteredCount++;
 428                 bool startSavePoint = cb.IsSavePoint();
 429                 int steps = cb.StartUndo();
 430                 //Platform::DebugPrintf("Steps=%d\n", steps);
 431                 for (int step = 0; step < steps; step++) {
 432                         int prevLinesTotal = LinesTotal();
 433                         const Action &action = cb.GetUndoStep();
 434                         if (action.at == removeAction) {
 435                                 NotifyModified(DocModification(
 436                                                    SC_MOD_BEFOREINSERT | SC_PERFORMED_UNDO, action));
 437                         } else {
 438                                 NotifyModified(DocModification(
 439                                                    SC_MOD_BEFOREDELETE | SC_PERFORMED_UNDO, action));
 440                         }
 441                         cb.PerformUndoStep();
 442                         int cellPosition = action.position / 2;
 443                         ModifiedAt(cellPosition);
 444                         newPos = cellPosition;
 445
 446                         int modFlags = SC_PERFORMED_UNDO;
 447                         // With undo, an insertion action becomes a deletion notification
 448                         if (action.at == removeAction) {
 449                                 newPos += action.lenData;
 450                                 modFlags |= SC_MOD_INSERTTEXT;
 451                         } else {
 452                                 modFlags |= SC_MOD_DELETETEXT;
 453                         }
 454                         if (step == steps - 1)
 455                                 modFlags |= SC_LASTSTEPINUNDOREDO;
 456                         NotifyModified(DocModification(modFlags, cellPosition, action.lenData,
 457                                                        LinesTotal() - prevLinesTotal, action.data));
 458                 }
 459
 460                 bool endSavePoint = cb.IsSavePoint();
 461                 if (startSavePoint != endSavePoint)
 462                         NotifySavePoint(endSavePoint);
 463                 enteredCount--;
 464         }
 465         return newPos;
 466 }
 467
 468 int Document::Redo() {
 469         int newPos = 0;
 470         if (enteredCount == 0) {
 471                 enteredCount++;
 472                 bool startSavePoint = cb.IsSavePoint();
 473                 int steps = cb.StartRedo();
 474                 for (int step = 0; step < steps; step++) {
 475                         int prevLinesTotal = LinesTotal();
 476                         const Action &action = cb.GetRedoStep();
 477                         if (action.at == insertAction) {
 478                                 NotifyModified(DocModification(
 479                                                    SC_MOD_BEFOREINSERT | SC_PERFORMED_REDO, action));
 480                         } else {
 481                                 NotifyModified(DocModification(
 482                                                    SC_MOD_BEFOREDELETE | SC_PERFORMED_REDO, action));
 483                         }
 484                         cb.PerformRedoStep();
 485                         ModifiedAt(action.position / 2);
 486                         newPos = action.position / 2;
 487
 488                         int modFlags = SC_PERFORMED_REDO;
 489                         if (action.at == insertAction) {
 490                                 newPos += action.lenData;
 491                                 modFlags |= SC_MOD_INSERTTEXT;
 492                         } else {
 493                                 modFlags |= SC_MOD_DELETETEXT;
 494                         }
 495                         if (step == steps - 1)
 496                                 modFlags |= SC_LASTSTEPINUNDOREDO;
 497                         NotifyModified(
 498                             DocModification(modFlags, action.position / 2, action.lenData,
 499                                             LinesTotal() - prevLinesTotal, action.data));
 500                 }
 501
 502                 bool endSavePoint = cb.IsSavePoint();
 503                 if (startSavePoint != endSavePoint)
 504                         NotifySavePoint(endSavePoint);
 505                 enteredCount--;
 506         }
 507         return newPos;
 508 }
 509
 510 void Document::InsertChar(int pos, char ch) {
 511         char chs[2];
 512         chs[0] = ch;
 513         chs[1] = 0;
 514         InsertStyledString(pos*2, chs, 2);
 515 }
 516
 517 // Insert a null terminated string
 518 void Document::InsertString(int position, const char *s) {
 519         InsertString(position, s, strlen(s));
 520 }
 521
 522 // Insert a string with a length
 523 void Document::InsertString(int position, const char *s, int insertLength) {
 524         char *sWithStyle = new char[insertLength * 2];
 525         if (sWithStyle) {
 526                 for (int i = 0; i < insertLength; i++) {
 527                         sWithStyle[i*2] = s[i];
 528                         sWithStyle[i*2 + 1] = 0;
 529                 }
 530                 InsertStyledString(position*2, sWithStyle, insertLength*2);
 531                 delete []sWithStyle;
 532         }
 533 }
 534
 535 void Document::ChangeChar(int pos, char ch) {
 536         DeleteChars(pos, 1);
 537         InsertChar(pos, ch);
 538 }
 539
 540 void Document::DelChar(int pos) {
 541         DeleteChars(pos, LenChar(pos));
 542 }
 543
 544 int Document::DelCharBack(int pos) {
 545         if (pos <= 0) {
 546                 return pos;
 547         } else if (IsCrLf(pos - 2)) {
 548                 DeleteChars(pos - 2, 2);
 549                 return pos - 2;
 550         } else if (SC_CP_UTF8 == dbcsCodePage) {
 551                 int startChar = MovePositionOutsideChar(pos - 1, -1, false);
 552                 DeleteChars(startChar, pos - startChar);
 553                 return startChar;
 554         } else if (IsDBCS(pos - 1)) {
 555                 DeleteChars(pos - 2, 2);
 556                 return pos - 2;
 557         } else {
 558                 DeleteChars(pos - 1, 1);
 559                 return pos - 1;
 560         }
 561 }
 562
 563 static bool isindentchar(char ch) {
 564         return (ch == ' ') || (ch == '\t');
 565 }
 566
 567 static int NextTab(int pos, int tabSize) {
 568         return ((pos / tabSize) + 1) * tabSize;
 569 }
 570
 571 static void CreateIndentation(char *linebuf, int length, int indent, int tabSize, bool insertSpaces) {
 572         length--;       // ensure space for \0
 573         if (!insertSpaces) {
 574                 while ((indent >= tabSize) && (length > 0)) {
 575                         *linebuf++ = '\t';
 576                         indent -= tabSize;
 577                         length--;
 578                 }
 579         }
 580         while ((indent > 0) && (length > 0)) {
 581                 *linebuf++ = ' ';
 582                 indent--;
 583                 length--;
 584         }
 585         *linebuf = '\0';
 586 }
 587
 588 int Document::GetLineIndentation(int line) {
 589         int indent = 0;
 590         if ((line >= 0) && (line < LinesTotal())) {
 591                 int lineStart = LineStart(line);
 592                 int length = Length();
 593                 for (int i = lineStart;i < length;i++) {
 594                         char ch = cb.CharAt(i);
 595                         if (ch == ' ')
 596                                 indent++;
 597                         else if (ch == '\t')
 598                                 indent = NextTab(indent, tabInChars);
 599                         else
 600                                 return indent;
 601                 }
 602         }
 603         return indent;
 604 }
 605
 606 void Document::SetLineIndentation(int line, int indent) {
 607         int indentOfLine = GetLineIndentation(line);
 608         if (indent < 0)
 609                 indent = 0;
 610         if (indent != indentOfLine) {
 611                 char linebuf[1000];
 612                 CreateIndentation(linebuf, sizeof(linebuf), indent, tabInChars, !useTabs);
 613                 int thisLineStart = LineStart(line);
 614                 int indentPos = GetLineIndentPosition(line);
 615                 DeleteChars(thisLineStart, indentPos - thisLineStart);
 616                 InsertString(thisLineStart, linebuf);
 617         }
 618 }
 619
 620 int Document::GetLineIndentPosition(int line) {
 621         if (line < 0)
 622                 return 0;
 623         int pos = LineStart(line);
 624         int length = Length();
 625         while ((pos < length) && isindentchar(cb.CharAt(pos))) {
 626                 pos++;
 627         }
 628         return pos;
 629 }
 630
 631 int Document::GetColumn(int pos) {
 632         int column = 0;
 633         int line = LineFromPosition(pos);
 634         if ((line >= 0) && (line < LinesTotal())) {
 635                 for (int i = LineStart(line);i < pos;i++) {
 636                         char ch = cb.CharAt(i);
 637                         if (ch == '\t')
 638                                 column = NextTab(column, tabInChars);
 639                         else if (ch == '\r')
 640                                 return column;
 641                         else if (ch == '\n')
 642                                 return column;
 643                         else
 644                                 column++;
 645                 }
 646         }
 647         return column;
 648 }
 649
 650 void Document::Indent(bool forwards, int lineBottom, int lineTop) {
 651         // Dedent - suck white space off the front of the line to dedent by equivalent of a tab
 652         for (int line = lineBottom; line >= lineTop; line--) {
 653                 int indentOfLine = GetLineIndentation(line);
 654                 if (forwards)
 655                         SetLineIndentation(line, indentOfLine + IndentSize());
 656                 else
 657                         SetLineIndentation(line, indentOfLine - IndentSize());
 658         }
 659 }
 660
 661 void Document::ConvertLineEnds(int eolModeSet) {
 662         BeginUndoAction();
 663         for (int pos = 0; pos < Length(); pos++) {
 664                 if (cb.CharAt(pos) == '\r') {
 665                         if (cb.CharAt(pos + 1) == '\n') {
 666                                 if (eolModeSet != SC_EOL_CRLF) {
 667                                         DeleteChars(pos, 2);
 668                                         if (eolModeSet == SC_EOL_CR)
 669                                                 InsertString(pos, "\r", 1);
 670                                         else
 671                                                 InsertString(pos, "\n", 1);
 672                                 } else {
 673                                         pos++;
 674                                 }
 675                         } else {
 676                                 if (eolModeSet != SC_EOL_CR) {
 677                                         DeleteChars(pos, 1);
 678                                         if (eolModeSet == SC_EOL_CRLF) {
 679                                                 InsertString(pos, "\r\n", 2);
 680                                                 pos++;
 681                                         } else {
 682                                                 InsertString(pos, "\n", 1);
 683                                         }
 684                                 }
 685                         }
 686                 } else if (cb.CharAt(pos) == '\n') {
 687                         if (eolModeSet != SC_EOL_LF) {
 688                                 DeleteChars(pos, 1);
 689                                 if (eolModeSet == SC_EOL_CRLF) {
 690                                         InsertString(pos, "\r\n", 2);
 691                                         pos++;
 692                                 } else {
 693                                         InsertString(pos, "\r", 1);
 694                                 }
 695                         }
 696                 }
 697         }
 698         EndUndoAction();
 699 }
 700
 701 bool Document::IsWordChar(unsigned char ch) {
 702         if ((SC_CP_UTF8 == dbcsCodePage) && (ch > 0x80))
 703                 return true;
 704         return wordchars[ch];
 705 }
 706
 707 int Document::ExtendWordSelect(int pos, int delta) {
 708         if (delta < 0) {
 709                 while (pos > 0 && IsWordChar(cb.CharAt(pos - 1)))
 710                         pos--;
 711         } else {
 712                 while (pos < (Length()) && IsWordChar(cb.CharAt(pos)))
 713                         pos++;
 714         }
 715         return pos;
 716 }
 717
 718 int Document::NextWordStart(int pos, int delta) {
 719         if (delta < 0) {
 720                 while (pos > 0 && (cb.CharAt(pos - 1) == ' ' || cb.CharAt(pos - 1) == '\t'))
 721                         pos--;
 722                 if (isspacechar(cb.CharAt(pos - 1))) {  // Back up to previous line
 723                         while (pos > 0 && isspacechar(cb.CharAt(pos - 1)))
 724                                 pos--;
 725                 } else {
 726                         bool startAtWordChar = IsWordChar(cb.CharAt(pos - 1));
 727                         while (pos > 0 && !isspacechar(cb.CharAt(pos - 1)) && (startAtWordChar == IsWordChar(cb.CharAt(pos - 1))))
 728                                 pos--;
 729                 }
 730         } else {
 731                 bool startAtWordChar = IsWordChar(cb.CharAt(pos));
 732                 while (pos < (Length()) && isspacechar(cb.CharAt(pos)))
 733                         pos++;
 734                 while (pos < (Length()) && !isspacechar(cb.CharAt(pos)) && (startAtWordChar == IsWordChar(cb.CharAt(pos))))
 735                         pos++;
 736                 while (pos < (Length()) && (cb.CharAt(pos) == ' ' || cb.CharAt(pos) == '\t'))
 737                         pos++;
 738         }
 739         return pos;
 740 }
 741
 742 /**
 743  * Check that the character before the given position
 744  * is not a word character.
 745  */
 746 bool Document::IsWordStartAt(int pos) {
 747         if (pos > 0) {
 748                 return !IsWordChar(CharAt(pos - 1));
 749         }
 750         return true;
 751 }
 752
 753 /**
 754  * Check that the character after the given position
 755  * is not a word character.
 756  */
 757 bool Document::IsWordEndAt(int pos) {
 758         if (pos < Length() - 1) {
 759                 return !IsWordChar(CharAt(pos));
 760         }
 761         return true;
 762 }
 763
 764 /**
 765  * Check that the given range is delimited by
 766  * non word characters.
 767  */
 768 bool Document::IsWordAt(int start, int end) {
 769         return IsWordStartAt(start) && IsWordEndAt(end);
 770 }
 771
 772 // The comparison and case changing functions here assume ASCII
 773 // or extended ASCII such as the normal Windows code page.
 774
 775 static inline char MakeUpperCase(char ch) {
 776         if (ch < 'a' || ch > 'z')
 777                 return ch;
 778         else
 779                 return static_cast<char>(ch - 'a' + 'A');
 780 }
 781
 782 static inline char MakeLowerCase(char ch) {
 783         if (ch < 'A' || ch > 'Z')
 784                 return ch;
 785         else
 786                 return static_cast<char>(ch - 'A' + 'a');
 787 }
 788
 789 // Define a way for the Regular Expression code to access the document
 790 class DocumentIndexer : public CharacterIndexer {
 791         Document *pdoc;
 792         int end;
 793 public:
 794 DocumentIndexer(Document *pdoc_, int end_) :
 795         pdoc(pdoc_), end(end_) {}
 796
 797         virtual char CharAt(int index) {
 798                 if (index < 0 || index >= end)
 799                         return 0;
 800                 else
 801                         return pdoc->CharAt(index);
 802         }
 803 };
 804
 805 /**
 806  * Find text in document, supporting both forward and backward
 807  * searches (just pass minPos > maxPos to do a backward search)
 808  * Has not been tested with backwards DBCS searches yet.
 809  */
 810 long Document::FindText(int minPos, int maxPos, const char *s,
 811                         bool caseSensitive, bool word, bool wordStart, bool regExp,
 812                         int *length) {
 813         if (regExp) {
 814                 if (!pre)
 815                         pre = new RESearch();
 816                 if (!pre)
 817                         return -1;
 818
 819                 int startPos;
 820                 int endPos;
 821
 822                 if (minPos <= maxPos) {
 823                         startPos = minPos;
 824                         endPos = maxPos;
 825                 } else {
 826                         startPos = maxPos;
 827                         endPos = minPos;
 828                 }
 829
 830                 // Range endpoints should not be inside DBCS characters, but just in case, move them.
 831                 startPos = MovePositionOutsideChar(startPos, 1, false);
 832                 endPos = MovePositionOutsideChar(endPos, 1, false);
 833
 834                 const char *errmsg = pre->Compile(s, *length, caseSensitive);
 835                 if (errmsg) {
 836                         return -1;
 837                 }
 838                 // Find a variable in a property file: \$(\([A-Za-z0-9_.]+\))
 839                 // Replace first '.' with '-' in each property file variable reference:
 840                 //     Search: \$(\([A-Za-z0-9_-]+\)\.\([A-Za-z0-9_.]+\))
 841                 //     Replace: $(\1-\2)
 842                 int lineRangeStart = LineFromPosition(startPos);
 843                 int lineRangeEnd = LineFromPosition(endPos);
 844                 if ((startPos >= LineEnd(lineRangeStart)) && (lineRangeStart < lineRangeEnd)) {
 845                         // the start position is at end of line or between line end characters.
 846                         lineRangeStart++;
 847                         startPos = LineStart(lineRangeStart);
 848                 }
 849                 int pos = -1;
 850                 int lenRet = 0;
 851                 char searchEnd = s[*length - 1];
 852                 if (*length == 1) {
 853                         // These produce empty selections so nudge them on if needed
 854                         if (s[0] == '^') {
 855                                 if (startPos == LineStart(lineRangeStart))
 856                                         startPos++;
 857                         } else if (s[0] == '$') {
 858                                 if ((startPos == LineEnd(lineRangeStart)) && (lineRangeStart < lineRangeEnd))
 859                                         startPos = LineStart(lineRangeStart + 1);
 860                         }
 861                         lineRangeStart = LineFromPosition(startPos);
 862                         lineRangeEnd = LineFromPosition(endPos);
 863                 }
 864                 for (int line = lineRangeStart; line <= lineRangeEnd; line++) {
 865                         int startOfLine = LineStart(line);
 866                         int endOfLine = LineEnd(line);
 867                         if (line == lineRangeStart) {
 868                                 if ((startPos != startOfLine) && (s[0] == '^'))
 869                                         continue;       // Can't match start of line if start position after start of line
 870                                 startOfLine = startPos;
 871                         }
 872                         if (line == lineRangeEnd) {
 873                                 if ((endPos != endOfLine) && (searchEnd == '$'))
 874                                         continue;       // Can't match end of line if end position before end of line
 875                                 endOfLine = endPos;
 876                         }
 877                         DocumentIndexer di(this, endOfLine);
 878                         int success = pre->Execute(di, startOfLine, endOfLine);
 879                         if (success) {
 880                                 pos = pre->bopat[0];
 881                                 lenRet = pre->eopat[0] - pre->bopat[0];
 882                                 break;
 883                         }
 884                 }
 885                 *length = lenRet;
 886                 return pos;
 887
 888         } else {
 889
 890                 bool forward = minPos <= maxPos;
 891                 int increment = forward ? 1 : -1;
 892
 893                 // Range endpoints should not be inside DBCS characters, but just in case, move them.
 894                 int startPos = MovePositionOutsideChar(minPos, increment, false);
 895                 int endPos = MovePositionOutsideChar(maxPos, increment, false);
 896
 897                 // Compute actual search ranges needed
 898                 int lengthFind = *length;
 899                 if (lengthFind == -1)
 900                         lengthFind = strlen(s);
 901                 int endSearch = endPos;
 902                 if (startPos <= endPos) {
 903                         endSearch = endPos - lengthFind + 1;
 904                 }
 905                 //Platform::DebugPrintf("Find %d %d %s %d\n", startPos, endPos, ft->lpstrText, lengthFind);
 906                 char firstChar = s[0];
 907                 if (!caseSensitive)
 908                         firstChar = static_cast<char>(MakeUpperCase(firstChar));
 909                 int pos = startPos;
 910                 while (forward ? (pos < endSearch) : (pos >= endSearch)) {
 911                         char ch = CharAt(pos);
 912                         if (caseSensitive) {
 913                                 if (ch == firstChar) {
 914                                         bool found = true;
 915                                         for (int posMatch = 1; posMatch < lengthFind && found; posMatch++) {
 916                                                 ch = CharAt(pos + posMatch);
 917                                                 if (ch != s[posMatch])
 918                                                         found = false;
 919                                         }
 920                                         if (found) {
 921                                                 if ((!word && !wordStart) ||
 922                                                         word && IsWordAt(pos, pos + lengthFind) ||
 923                                                         wordStart && IsWordStartAt(pos))
 924                                                         return pos;
 925                                         }
 926                                 }
 927                         } else {
 928                                 if (MakeUpperCase(ch) == firstChar) {
 929                                         bool found = true;
 930                                         for (int posMatch = 1; posMatch < lengthFind && found; posMatch++) {
 931                                                 ch = CharAt(pos + posMatch);
 932                                                 if (MakeUpperCase(ch) != MakeUpperCase(s[posMatch]))
 933                                                         found = false;
 934                                         }
 935                                         if (found) {
 936                                                 if ((!word && !wordStart) ||
 937                                                         word && IsWordAt(pos, pos + lengthFind) ||
 938                                                         wordStart && IsWordStartAt(pos))
 939                                                         return pos;
 940                                         }
 941                                 }
 942                         }
 943                         pos += increment;
 944                         if (dbcsCodePage) {
 945                                 // Ensure trying to match from start of character
 946                                 pos = MovePositionOutsideChar(pos, increment, false);
 947                         }
 948                 }
 949         }
 950         //Platform::DebugPrintf("Not found\n");
 951         return -1;
 952 }
 953
 954 const char *Document::SubstituteByPosition(const char *text, int *length) {
 955         if (!pre)
 956                 return 0;
 957         delete []substituted;
 958         substituted = 0;
 959         DocumentIndexer di(this, Length());
 960         if (!pre->GrabMatches(di))
 961                 return 0;
 962         unsigned int lenResult = 0;
 963         for (int i = 0; i < *length; i++) {
 964                 if ((text[i] == '\\') && (text[i + 1] >= '1' && text[i + 1] <= '9')) {
 965                         unsigned int patNum = text[i + 1] - '0';
 966                         lenResult += pre->eopat[patNum] - pre->bopat[patNum];
 967                         i++;
 968                 } else {
 969                         lenResult++;
 970                 }
 971         }
 972         substituted = new char[lenResult + 1];
 973         if (!substituted)
 974                 return 0;
 975         char *o = substituted;
 976         for (int j = 0; j < *length; j++) {
 977                 if ((text[j] == '\\') && (text[j + 1] >= '1' && text[j + 1] <= '9')) {
 978                         unsigned int patNum = text[j + 1] - '0';
 979                         unsigned int len = pre->eopat[patNum] - pre->bopat[patNum];
 980                         if (pre->pat[patNum])   // Will be null if try for a match that did not occur
 981                                 memcpy(o, pre->pat[patNum], len);
 982                         o += len;
 983                         j++;
 984                 } else {
 985                         *o++ = text[j];
 986                 }
 987         }
 988         *o = '\0';
 989         *length = lenResult;
 990         return substituted;
 991 }
 992
 993 int Document::LinesTotal() {
 994         return cb.Lines();
 995 }
 996
 997 void Document::ChangeCase(Range r, bool makeUpperCase) {
 998         for (int pos = r.start; pos < r.end; pos++) {
 999                 char ch = CharAt(pos);
1000                 if (dbcsCodePage && IsDBCS(pos)) {
1001                         pos += LenChar(pos);
1002                 } else {
1003                         if (makeUpperCase) {
1004                                 if (islower(ch)) {
1005                                         ChangeChar(pos, static_cast<char>(MakeUpperCase(ch)));
1006                                 }
1007                         } else {
1008                                 if (isupper(ch)) {
1009                                         ChangeChar(pos, static_cast<char>(MakeLowerCase(ch)));
1010                                 }
1011                         }
1012                 }
1013         }
1014 }
1015
1016 void Document::SetWordChars(unsigned char *chars) {
1017         int ch;
1018         for (ch = 0; ch < 256; ch++) {
1019                 wordchars[ch] = false;
1020         }
1021         if (chars) {
1022                 while (*chars) {
1023                         wordchars[*chars] = true;
1024                         chars++;
1025                 }
1026         } else {
1027                 for (ch = 0; ch < 256; ch++) {
1028                         wordchars[ch] = isalnum(ch) || ch == '_';
1029                 }
1030         }
1031 }
1032
1033 void Document::SetStylingBits(int bits) {
1034         stylingBits = bits;
1035         stylingBitsMask = 0;
1036         for (int bit = 0; bit < stylingBits; bit++) {
1037                 stylingBitsMask <<= 1;
1038                 stylingBitsMask |= 1;
1039         }
1040 }
1041
1042 void Document::StartStyling(int position, char mask) {
1043         stylingMask = mask;
1044         endStyled = position;
1045 }
1046
1047 void Document::SetStyleFor(int length, char style) {
1048         if (enteredCount == 0) {
1049                 enteredCount++;
1050                 int prevEndStyled = endStyled;
1051                 if (cb.SetStyleFor(endStyled, length, style, stylingMask)) {
1052                         DocModification mh(SC_MOD_CHANGESTYLE | SC_PERFORMED_USER,
1053                                            prevEndStyled, length);
1054                         NotifyModified(mh);
1055                 }
1056                 endStyled += length;
1057                 enteredCount--;
1058         }
1059 }
1060
1061 void Document::SetStyles(int length, char *styles) {
1062         if (enteredCount == 0) {
1063                 enteredCount++;
1064                 int prevEndStyled = endStyled;
1065                 bool didChange = false;
1066                 for (int iPos = 0; iPos < length; iPos++, endStyled++) {
1067                         if (cb.SetStyleAt(endStyled, styles[iPos], stylingMask)) {
1068                                 didChange = true;
1069                         }
1070                 }
1071                 if (didChange) {
1072                         DocModification mh(SC_MOD_CHANGESTYLE | SC_PERFORMED_USER,
1073                                            prevEndStyled, endStyled - prevEndStyled);
1074                         NotifyModified(mh);
1075                 }
1076                 enteredCount--;
1077         }
1078 }
1079
1080 bool Document::EnsureStyledTo(int pos) {
1081         // Ask the watchers to style, and stop as soon as one responds.
1082         for (int i = 0; pos > GetEndStyled() && i < lenWatchers; i++)
1083                 watchers[i].watcher->NotifyStyleNeeded(this, watchers[i].userData, pos);
1084         return pos <= GetEndStyled();
1085 }
1086
1087 bool Document::AddWatcher(DocWatcher *watcher, void *userData) {
1088         for (int i = 0; i < lenWatchers; i++) {
1089                 if ((watchers[i].watcher == watcher) &&
1090                         (watchers[i].userData == userData))
1091                         return false;
1092         }
1093         WatcherWithUserData *pwNew = new WatcherWithUserData[lenWatchers + 1];
1094         if (!pwNew)
1095                 return false;
1096         for (int j = 0; j < lenWatchers; j++)
1097                 pwNew[j] = watchers[j];
1098         pwNew[lenWatchers].watcher = watcher;
1099         pwNew[lenWatchers].userData = userData;
1100         delete []watchers;
1101         watchers = pwNew;
1102         lenWatchers++;
1103         return true;
1104 }
1105
1106 bool Document::RemoveWatcher(DocWatcher *watcher, void *userData) {
1107         for (int i = 0; i < lenWatchers; i++) {
1108                 if ((watchers[i].watcher == watcher) &&
1109                         (watchers[i].userData == userData)) {
1110                         if (lenWatchers == 1) {
1111                                 delete []watchers;
1112                                 watchers = 0;
1113                                 lenWatchers = 0;
1114                         } else {
1115                                 WatcherWithUserData *pwNew = new WatcherWithUserData[lenWatchers];
1116                                 if (!pwNew)
1117                                         return false;
1118                                 for (int j = 0; j < lenWatchers - 1; j++) {
1119                                         pwNew[j] = (j < i) ? watchers[j] : watchers[j + 1];
1120                                 }
1121                                 delete []watchers;
1122                                 watchers = pwNew;
1123                                 lenWatchers--;
1124                         }
1125                         return true;
1126                 }
1127         }
1128         return false;
1129 }
1130
1131 void Document::NotifyModifyAttempt() {
1132         for (int i = 0; i < lenWatchers; i++) {
1133                 watchers[i].watcher->NotifyModifyAttempt(this, watchers[i].userData);
1134         }
1135 }
1136
1137 void Document::NotifySavePoint(bool atSavePoint) {
1138         for (int i = 0; i < lenWatchers; i++) {
1139                 watchers[i].watcher->NotifySavePoint(this, watchers[i].userData, atSavePoint);
1140         }
1141 }
1142
1143 void Document::NotifyModified(DocModification mh) {
1144         for (int i = 0; i < lenWatchers; i++) {
1145                 watchers[i].watcher->NotifyModified(this, mh, watchers[i].userData);
1146         }
1147 }
1148
1149 bool Document::IsWordPartSeparator(char ch) {
1150         return ispunct(ch) && IsWordChar(ch);
1151 }
1152
1153 int Document::WordPartLeft(int pos) {
1154         if (pos > 0) {
1155                 --pos;
1156                 char startChar = cb.CharAt(pos);
1157                 if (IsWordPartSeparator(startChar)) {
1158                         while (pos > 0 && IsWordPartSeparator(cb.CharAt(pos))) {
1159                                 --pos;
1160                         }
1161                 }
1162                 if (pos > 0) {
1163                         startChar = cb.CharAt(pos);
1164                         --pos;
1165                         if (islower(startChar)) {
1166                                 while (pos > 0 && islower(cb.CharAt(pos)))
1167                                         --pos;
1168                                 if (!isupper(cb.CharAt(pos)) && !islower(cb.CharAt(pos)))
1169                                         ++pos;
1170                         } else if (isupper(startChar)) {
1171                                 while (pos > 0 && isupper(cb.CharAt(pos)))
1172                                         --pos;
1173                                 if (!isupper(cb.CharAt(pos)))
1174                                         ++pos;
1175                         } else if (isdigit(startChar)) {
1176                                 while (pos > 0 && isdigit(cb.CharAt(pos)))
1177                                         --pos;
1178                                 if (!isdigit(cb.CharAt(pos)))
1179                                         ++pos;
1180                         } else if (ispunct(startChar)) {
1181                                 while (pos > 0 && ispunct(cb.CharAt(pos)))
1182                                         --pos;
1183                                 if (!ispunct(cb.CharAt(pos)))
1184                                         ++pos;
1185                         } else if (isspacechar(startChar)) {
1186                                 while (pos > 0 && isspacechar(cb.CharAt(pos)))
1187                                         --pos;
1188                                 if (!isspacechar(cb.CharAt(pos)))
1189                                         ++pos;
1190                         }
1191                 }
1192         }
1193         return pos;
1194 }
1195
1196 int Document::WordPartRight(int pos) {
1197         char startChar = cb.CharAt(pos);
1198         int length = Length();
1199         if (IsWordPartSeparator(startChar)) {
1200                 while (pos < length && IsWordPartSeparator(cb.CharAt(pos)))
1201                         ++pos;
1202                 startChar = cb.CharAt(pos);
1203         }
1204         if (islower(startChar)) {
1205                 while (pos < length && islower(cb.CharAt(pos)))
1206                         ++pos;
1207         } else if (isupper(startChar)) {
1208                 if (islower(cb.CharAt(pos + 1))) {
1209                         ++pos;
1210                         while (pos < length && islower(cb.CharAt(pos)))
1211                                 ++pos;
1212                 } else {
1213                         while (pos < length && isupper(cb.CharAt(pos)))
1214                                 ++pos;
1215                 }
1216                 if (islower(cb.CharAt(pos)) && isupper(cb.CharAt(pos - 1)))
1217                         --pos;
1218         } else if (isdigit(startChar)) {
1219                 while (pos < length && isdigit(cb.CharAt(pos)))
1220                         ++pos;
1221         } else if (ispunct(startChar)) {
1222                 while (pos < length && ispunct(cb.CharAt(pos)))
1223                         ++pos;
1224         } else if (isspacechar(startChar)) {
1225                 while (pos < length && isspacechar(cb.CharAt(pos)))
1226                         ++pos;
1227         }
1228         return pos;
1229 }