src/stc/scintilla/src/Document.cxx

   1 // Scintilla source code edit control
   2 // Document.cxx - text document that handles notifications, DBCS, styling, words and end of line
   3 // Copyright 1998-2000 by Neil Hodgson <neilh@scintilla.org>
   4 // The License.txt file describes the conditions under which this software may be distributed.
   5
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9 #include <ctype.h>
  10
  11 #include "Platform.h"
  12
  13 #include "Scintilla.h"
  14 #include "SVector.h"
  15 #include "CellBuffer.h"
  16 #include "Document.h"
  17
  18 Document::Document() {
  19         refCount = 0;
  20 #ifdef unix
  21         eolMode = SC_EOL_LF;
  22 #else
  23         eolMode = SC_EOL_CRLF;
  24 #endif
  25         dbcsCodePage = 0;
  26         stylingBits = 5;
  27         stylingBitsMask = 0x1F;
  28         stylingPos = 0;
  29         stylingMask = 0;
  30         for (int ch = 0; ch < 256; ch++) {
  31                 wordchars[ch] = isalnum(ch) || ch == '_';
  32         }
  33         endStyled = 0;
  34         enteredCount = 0;
  35         enteredReadOnlyCount = 0;
  36         tabInChars = 8;
  37         indentInChars = 0;
  38         useTabs = true;
  39         watchers = 0;
  40         lenWatchers = 0;
  41 }
  42
  43 Document::~Document() {
  44         for (int i = 0; i < lenWatchers; i++) {
  45                 watchers[i].watcher->NotifyDeleted(this, watchers[i].userData);
  46         }
  47         delete []watchers;
  48         watchers = 0;
  49         lenWatchers = 0;
  50 }
  51
  52 // Increase reference count and return its previous value.
  53 int Document::AddRef() {
  54         return refCount++;
  55 }
  56
  57 // Decrease reference count and return its provius value.
  58 // Delete the document if reference count reaches zero.
  59 int Document::Release() {
  60         int curRefCount = --refCount;
  61         if (curRefCount == 0)
  62                 delete this;
  63         return curRefCount;
  64 }
  65
  66 void Document::SetSavePoint() {
  67         cb.SetSavePoint();
  68         NotifySavePoint(true);
  69 }
  70
  71 int Document::AddMark(int line, int markerNum) {
  72         int prev = cb.AddMark(line, markerNum);
  73         DocModification mh(SC_MOD_CHANGEMARKER, LineStart(line), 0, 0, 0);
  74         NotifyModified(mh);
  75         return prev;
  76 }
  77
  78 void Document::DeleteMark(int line, int markerNum) {
  79         cb.DeleteMark(line, markerNum);
  80         DocModification mh(SC_MOD_CHANGEMARKER, LineStart(line), 0, 0, 0);
  81         NotifyModified(mh);
  82 }
  83
  84 void Document::DeleteMarkFromHandle(int markerHandle) {
  85         cb.DeleteMarkFromHandle(markerHandle);
  86         DocModification mh(SC_MOD_CHANGEMARKER, 0, 0, 0, 0);
  87         NotifyModified(mh);
  88 }
  89
  90 void Document::DeleteAllMarks(int markerNum) {
  91         cb.DeleteAllMarks(markerNum);
  92         DocModification mh(SC_MOD_CHANGEMARKER, 0, 0, 0, 0);
  93         NotifyModified(mh);
  94 }
  95
  96 int Document::LineStart(int line) {
  97         return cb.LineStart(line);
  98 }
  99
 100 int Document::LineEnd(int line) {
 101         if (line == LinesTotal() - 1) {
 102                 return LineStart(line + 1);
 103         } else {
 104                 int position = LineStart(line + 1) - 1;
 105                 // When line terminator is CR+LF, may need to go back one more
 106                 if ((position > LineStart(line)) && (cb.CharAt(position - 1) == '\r')) {
 107                         position--;
 108                 }
 109                 return position;
 110         }
 111 }
 112
 113 int Document::LineFromPosition(int pos) {
 114         return cb.LineFromPosition(pos);
 115 }
 116
 117 int Document::LineEndPosition(int position) {
 118         return LineEnd(LineFromPosition(position));
 119 }
 120
 121 int Document::VCHomePosition(int position) {
 122         int line = LineFromPosition(position);
 123         int startPosition = LineStart(line);
 124         int endLine = LineStart(line + 1) - 1;
 125         int startText = startPosition;
 126         while (startText < endLine && (cb.CharAt(startText) == ' ' || cb.CharAt(startText) == '\t' ) )
 127                 startText++;
 128         if (position == startText)
 129                 return startPosition;
 130         else
 131                 return startText;
 132 }
 133
 134 int Document::SetLevel(int line, int level) {
 135         int prev = cb.SetLevel(line, level);
 136         if (prev != level) {
 137                 DocModification mh(SC_MOD_CHANGEFOLD, LineStart(line), 0, 0, 0);
 138                 mh.line = line;
 139                 mh.foldLevelNow = level;
 140                 mh.foldLevelPrev = prev;
 141                 NotifyModified(mh);
 142         }
 143         return prev;
 144 }
 145
 146 static bool IsSubordinate(int levelStart, int levelTry) {
 147         if (levelTry & SC_FOLDLEVELWHITEFLAG)
 148                 return true;
 149         else
 150                 return (levelStart & SC_FOLDLEVELNUMBERMASK) < (levelTry & SC_FOLDLEVELNUMBERMASK);
 151 }
 152
 153 int Document::GetLastChild(int lineParent, int level) {
 154         if (level == -1)
 155                 level = GetLevel(lineParent) & SC_FOLDLEVELNUMBERMASK;
 156         int maxLine = LinesTotal();
 157         int lineMaxSubord = lineParent;
 158         while (lineMaxSubord < maxLine-1) {
 159                 EnsureStyledTo(LineStart(lineMaxSubord+2));
 160                 if (!IsSubordinate(level, GetLevel(lineMaxSubord+1)))
 161                         break;
 162                 lineMaxSubord++;
 163         }
 164         if (lineMaxSubord > lineParent) {
 165                 if (level > (GetLevel(lineMaxSubord+1) & SC_FOLDLEVELNUMBERMASK)) {
 166                         // Have chewed up some whitespace that belongs to a parent so seek back
 167                         if ((lineMaxSubord > lineParent) && (GetLevel(lineMaxSubord) & SC_FOLDLEVELWHITEFLAG)) {
 168                                 lineMaxSubord--;
 169                         }
 170                 }
 171         }
 172         return lineMaxSubord;
 173 }
 174
 175 int Document::GetFoldParent(int line) {
 176         int level = GetLevel(line);
 177         int lineLook = line-1;
 178         while ((lineLook > 0) && (
 179                 (!(GetLevel(lineLook) & SC_FOLDLEVELHEADERFLAG)) ||
 180                 ((GetLevel(lineLook) & SC_FOLDLEVELNUMBERMASK) >= level))
 181         ) {
 182                 lineLook--;
 183         }
 184         if ((GetLevel(lineLook) & SC_FOLDLEVELHEADERFLAG) &&
 185                 ((GetLevel(lineLook) & SC_FOLDLEVELNUMBERMASK) < level)) {
 186                 return lineLook;
 187         } else {
 188                 return -1;
 189         }
 190 }
 191
 192 int Document::ClampPositionIntoDocument(int pos) {
 193         return Platform::Clamp(pos, 0, Length());
 194 }
 195
 196 bool Document::IsCrLf(int pos) {
 197         if (pos < 0)
 198                 return false;
 199         if (pos >= (Length() - 1))
 200                 return false;
 201         return (cb.CharAt(pos) == '\r') && (cb.CharAt(pos + 1) == '\n');
 202 }
 203
 204 bool Document::IsDBCS(int pos) {
 205 #if PLAT_WIN
 206         if (dbcsCodePage) {
 207                 if (SC_CP_UTF8 == dbcsCodePage) {
 208                         unsigned char ch = static_cast<unsigned char>(cb.CharAt(pos));
 209                         return ch >= 0x80;
 210                 } else {
 211                         // Anchor DBCS calculations at start of line because start of line can
 212                         // not be a DBCS trail byte.
 213                         int startLine = pos;
 214                         while (startLine > 0 && cb.CharAt(startLine) != '\r' && cb.CharAt(startLine) != '\n')
 215                                 startLine--;
 216                         while (startLine <= pos) {
 217                                 if (IsDBCSLeadByteEx(dbcsCodePage, cb.CharAt(startLine))) {
 218                                         startLine++;
 219                                         if (startLine >= pos)
 220                                                 return true;
 221                                 }
 222                                 startLine++;
 223                         }
 224                 }
 225         }
 226         return false;
 227 #else
 228         return false;
 229 #endif
 230 }
 231
 232 int Document::LenChar(int pos) {
 233         if (IsCrLf(pos)) {
 234                 return 2;
 235         } else if (SC_CP_UTF8 == dbcsCodePage) {
 236                 unsigned char ch = static_cast<unsigned char>(cb.CharAt(pos));
 237                 if (ch < 0x80)
 238                         return 1;
 239                 int len = 2;
 240                 if (ch >= (0x80+0x40+0x20))
 241                         len = 3;
 242                 int lengthDoc = Length();
 243                 if ((pos + len) > lengthDoc)
 244                         return lengthDoc-pos;
 245                 else
 246                         return len;
 247         } else if (IsDBCS(pos)) {
 248                 return 2;
 249         } else {
 250                 return 1;
 251         }
 252 }
 253
 254 // Normalise a position so that it is not halfway through a two byte character.
 255 // This can occur in two situations -
 256 // When lines are terminated with \r\n pairs which should be treated as one character.
 257 // When displaying DBCS text such as Japanese.
 258 // If moving, move the position in the indicated direction.
 259 int Document::MovePositionOutsideChar(int pos, int moveDir, bool checkLineEnd) {
 260         //Platform::DebugPrintf("NoCRLF %d %d\n", pos, moveDir);
 261         // If out of range, just return value - should be fixed up after
 262         if (pos < 0)
 263                 return pos;
 264         if (pos > Length())
 265                 return pos;
 266
 267         // Position 0 and Length() can not be between any two characters
 268         if (pos == 0)
 269                 return pos;
 270         if (pos == Length())
 271                 return pos;
 272
 273         // assert pos > 0 && pos < Length()
 274         if (checkLineEnd && IsCrLf(pos - 1)) {
 275                 if (moveDir > 0)
 276                         return pos + 1;
 277                 else
 278                         return pos - 1;
 279         }
 280
 281         // Not between CR and LF
 282
 283 #if PLAT_WIN
 284         if (dbcsCodePage) {
 285                 if (SC_CP_UTF8 == dbcsCodePage) {
 286                         unsigned char ch = static_cast<unsigned char>(cb.CharAt(pos));
 287                         while ((pos > 0) && (pos < Length()) && (ch >= 0x80) && (ch < (0x80 + 0x40))) {
 288                                 // ch is a trail byte
 289                                 if (moveDir > 0)
 290                                         pos++;
 291                                 else
 292                                         pos--;
 293                                 ch = static_cast<unsigned char>(cb.CharAt(pos));
 294                         }
 295                 } else {
 296                         // Anchor DBCS calculations at start of line because start of line can
 297                         // not be a DBCS trail byte.
 298                         int startLine = pos;
 299                         while (startLine > 0 && cb.CharAt(startLine) != '\r' && cb.CharAt(startLine) != '\n')
 300                                 startLine--;
 301                         bool atLeadByte = false;
 302                         while (startLine < pos) {
 303                                 if (atLeadByte)
 304                                         atLeadByte = false;
 305                                 else if (IsDBCSLeadByteEx(dbcsCodePage, cb.CharAt(startLine)))
 306                                         atLeadByte = true;
 307                                 else
 308                                         atLeadByte = false;
 309                                 startLine++;
 310                                 //Platform::DebugPrintf("DBCS %s\n", atlead ? "D" : "-");
 311                         }
 312
 313                         if (atLeadByte) {
 314                                 // Position is between a lead byte and a trail byte
 315                                 if (moveDir > 0)
 316                                         return pos + 1;
 317                                 else
 318                                         return pos - 1;
 319                         }
 320                 }
 321         }
 322 #endif
 323
 324         return pos;
 325 }
 326
 327 void Document::ModifiedAt(int pos) {
 328         if (endStyled > pos)
 329                 endStyled = pos;
 330 }
 331
 332 // Document only modified by gateways DeleteChars, InsertStyledString, Undo, Redo, and SetStyleAt.
 333 // SetStyleAt does not change the persistent state of a document
 334
 335 // Unlike Undo, Redo, and InsertStyledString, the pos argument is a cell number not a char number
 336 void Document::DeleteChars(int pos, int len) {
 337         if (cb.IsReadOnly() && enteredReadOnlyCount==0) {
 338                 enteredReadOnlyCount++;
 339                 NotifyModifyAttempt();
 340                 enteredReadOnlyCount--;
 341         }
 342         if (enteredCount == 0) {
 343                 enteredCount++;
 344                 if (!cb.IsReadOnly()) {
 345                         NotifyModified(
 346                 DocModification(
 347                     SC_MOD_BEFOREDELETE | SC_PERFORMED_USER,
 348                     pos, len,
 349                     0, 0));
 350                         int prevLinesTotal = LinesTotal();
 351                         bool startSavePoint = cb.IsSavePoint();
 352                         const char *text = cb.DeleteChars(pos*2, len * 2);
 353                         if (startSavePoint && cb.IsCollectingUndo())
 354                                 NotifySavePoint(!startSavePoint);
 355                         ModifiedAt(pos);
 356                         NotifyModified(
 357                 DocModification(
 358                     SC_MOD_DELETETEXT | SC_PERFORMED_USER,
 359                     pos, len,
 360                     LinesTotal() - prevLinesTotal, text));
 361                 }
 362                 enteredCount--;
 363         }
 364 }
 365
 366 void Document::InsertStyledString(int position, char *s, int insertLength) {
 367         if (cb.IsReadOnly() && enteredReadOnlyCount==0) {
 368                 enteredReadOnlyCount++;
 369                 NotifyModifyAttempt();
 370                 enteredReadOnlyCount--;
 371         }
 372         if (enteredCount == 0) {
 373                 enteredCount++;
 374                 if (!cb.IsReadOnly()) {
 375                         NotifyModified(
 376                 DocModification(
 377                     SC_MOD_BEFOREINSERT | SC_PERFORMED_USER,
 378                     position / 2, insertLength / 2,
 379                     0, 0));
 380                         int prevLinesTotal = LinesTotal();
 381                         bool startSavePoint = cb.IsSavePoint();
 382                         const char *text = cb.InsertString(position, s, insertLength);
 383                         if (startSavePoint && cb.IsCollectingUndo())
 384                                 NotifySavePoint(!startSavePoint);
 385                         ModifiedAt(position / 2);
 386                         NotifyModified(
 387                 DocModification(
 388                     SC_MOD_INSERTTEXT | SC_PERFORMED_USER,
 389                     position / 2, insertLength / 2,
 390                     LinesTotal() - prevLinesTotal, text));
 391                 }
 392                 enteredCount--;
 393         }
 394 }
 395
 396 int Document::Undo() {
 397         int newPos = 0;
 398         if (enteredCount == 0) {
 399                 enteredCount++;
 400                 bool startSavePoint = cb.IsSavePoint();
 401                 int steps = cb.StartUndo();
 402                 //Platform::DebugPrintf("Steps=%d\n", steps);
 403                 for (int step=0; step<steps; step++) {
 404                         int prevLinesTotal = LinesTotal();
 405                         const Action &action = cb.GetUndoStep();
 406                         if (action.at == removeAction) {
 407                             NotifyModified(DocModification(
 408                     SC_MOD_BEFOREINSERT | SC_PERFORMED_UNDO, action));
 409             } else {
 410                             NotifyModified(DocModification(
 411                     SC_MOD_BEFOREDELETE | SC_PERFORMED_UNDO, action));
 412             }
 413                         cb.PerformUndoStep();
 414                         int cellPosition = action.position / 2;
 415                         ModifiedAt(cellPosition);
 416                         newPos = cellPosition;
 417
 418                         int modFlags = SC_PERFORMED_UNDO;
 419                         // With undo, an insertion action becomes a deletion notification
 420                         if (action.at == removeAction) {
 421                                 newPos += action.lenData;
 422                                 modFlags |= SC_MOD_INSERTTEXT;
 423                         } else {
 424                                 modFlags |= SC_MOD_DELETETEXT;
 425                         }
 426                         if (step == steps-1)
 427                                 modFlags |= SC_LASTSTEPINUNDOREDO;
 428                         NotifyModified(DocModification(modFlags, cellPosition, action.lenData,
 429                                 LinesTotal() - prevLinesTotal, action.data));
 430                 }
 431
 432                 bool endSavePoint = cb.IsSavePoint();
 433                 if (startSavePoint != endSavePoint)
 434                         NotifySavePoint(endSavePoint);
 435                 enteredCount--;
 436         }
 437         return newPos;
 438 }
 439
 440 int Document::Redo() {
 441         int newPos = 0;
 442         if (enteredCount == 0) {
 443                 enteredCount++;
 444                 bool startSavePoint = cb.IsSavePoint();
 445                 int steps = cb.StartRedo();
 446                 for (int step=0; step<steps; step++) {
 447                         int prevLinesTotal = LinesTotal();
 448                         const Action &action = cb.GetRedoStep();
 449                         if (action.at == insertAction) {
 450                             NotifyModified(DocModification(
 451                     SC_MOD_BEFOREINSERT | SC_PERFORMED_REDO, action));
 452             } else {
 453                             NotifyModified(DocModification(
 454                     SC_MOD_BEFOREDELETE | SC_PERFORMED_REDO, action));
 455             }
 456                         cb.PerformRedoStep();
 457                         ModifiedAt(action.position / 2);
 458                         newPos = action.position / 2;
 459
 460                         int modFlags = SC_PERFORMED_REDO;
 461                         if (action.at == insertAction) {
 462                                 newPos += action.lenData;
 463                                 modFlags |= SC_MOD_INSERTTEXT;
 464                         } else {
 465                                 modFlags |= SC_MOD_DELETETEXT;
 466                         }
 467                         if (step == steps-1)
 468                                 modFlags |= SC_LASTSTEPINUNDOREDO;
 469                         NotifyModified(
 470                 DocModification(modFlags, action.position / 2, action.lenData,
 471                                 LinesTotal() - prevLinesTotal, action.data));
 472                 }
 473
 474                 bool endSavePoint = cb.IsSavePoint();
 475                 if (startSavePoint != endSavePoint)
 476                         NotifySavePoint(endSavePoint);
 477                 enteredCount--;
 478         }
 479         return newPos;
 480 }
 481
 482 void Document::InsertChar(int pos, char ch) {
 483         char chs[2];
 484         chs[0] = ch;
 485         chs[1] = 0;
 486         InsertStyledString(pos*2, chs, 2);
 487 }
 488
 489 // Insert a null terminated string
 490 void Document::InsertString(int position, const char *s) {
 491         InsertString(position, s, strlen(s));
 492 }
 493
 494 // Insert a string with a length
 495 void Document::InsertString(int position, const char *s, int insertLength) {
 496         char *sWithStyle = new char[insertLength * 2];
 497         if (sWithStyle) {
 498                 for (int i = 0; i < insertLength; i++) {
 499                         sWithStyle[i*2] = s[i];
 500                         sWithStyle[i*2 + 1] = 0;
 501                 }
 502                 InsertStyledString(position*2, sWithStyle, insertLength*2);
 503                 delete []sWithStyle;
 504         }
 505 }
 506
 507 void Document::ChangeChar(int pos, char ch) {
 508         DeleteChars(pos, 1);
 509         InsertChar(pos, ch);
 510 }
 511
 512 void Document::DelChar(int pos) {
 513         DeleteChars(pos, LenChar(pos));
 514 }
 515
 516 int Document::DelCharBack(int pos) {
 517         if (pos <= 0) {
 518                 return pos;
 519         } else if (IsCrLf(pos - 2)) {
 520                 DeleteChars(pos - 2, 2);
 521                 return pos - 2;
 522         } else if (SC_CP_UTF8 == dbcsCodePage) {
 523                 int startChar = MovePositionOutsideChar(pos-1, -1, false);
 524                 DeleteChars(startChar, pos - startChar);
 525                 return startChar;
 526         } else if (IsDBCS(pos - 1)) {
 527                 DeleteChars(pos - 2, 2);
 528                 return pos - 2;
 529         } else {
 530                 DeleteChars(pos - 1, 1);
 531                 return pos - 1;
 532         }
 533 }
 534
 535 static bool isindentchar(char ch) {
 536         return (ch == ' ') || (ch == '\t');
 537 }
 538
 539 static int NextTab(int pos, int tabSize) {
 540         return ((pos / tabSize) + 1) * tabSize;
 541 }
 542
 543 static void CreateIndentation(char *linebuf, int length, int indent, int tabSize, bool insertSpaces) {
 544         length--;       // ensure space for \0
 545         if (!insertSpaces) {
 546                 while ((indent >= tabSize) && (length > 0)) {
 547                         *linebuf++ = '\t';
 548                         indent -= tabSize;
 549                         length--;
 550                 }
 551         }
 552         while ((indent > 0) && (length > 0)) {
 553                 *linebuf++ = ' ';
 554                 indent--;
 555                 length--;
 556         }
 557         *linebuf = '\0';
 558 }
 559
 560 int Document::GetLineIndentation(int line) {
 561         int indent = 0;
 562         if ((line >= 0) && (line < LinesTotal())) {
 563                 int lineStart = LineStart(line);
 564                 int length = Length();
 565                 for (int i=lineStart;i<length;i++) {
 566                         char ch = cb.CharAt(i);
 567                         if (ch == ' ')
 568                                 indent++;
 569                         else if (ch == '\t')
 570                                 indent = NextTab(indent, tabInChars);
 571                         else
 572                                 return indent;
 573                 }
 574         }
 575         return indent;
 576 }
 577
 578 void Document::SetLineIndentation(int line, int indent) {
 579         int indentOfLine = GetLineIndentation(line);
 580         if (indent < 0)
 581                 indent = 0;
 582         if (indent != indentOfLine) {
 583                 char linebuf[1000];
 584                 CreateIndentation(linebuf, sizeof(linebuf), indent, tabInChars, !useTabs);
 585                 int thisLineStart = LineStart(line);
 586                 int indentPos = GetLineIndentPosition(line);
 587                 DeleteChars(thisLineStart, indentPos - thisLineStart);
 588                 InsertString(thisLineStart, linebuf);
 589         }
 590 }
 591
 592 int Document::GetLineIndentPosition(int line) {
 593         int pos = LineStart(line);
 594         int length = Length();
 595         while ((pos < length) && isindentchar(cb.CharAt(pos))) {
 596                 pos++;
 597         }
 598         return pos;
 599 }
 600
 601 void Document::Indent(bool forwards, int lineBottom, int lineTop) {
 602         // Dedent - suck white space off the front of the line to dedent by equivalent of a tab
 603         for (int line = lineBottom; line >= lineTop; line--) {
 604                 int indentOfLine = GetLineIndentation(line);
 605                 if (forwards)
 606                         SetLineIndentation(line, indentOfLine + IndentSize());
 607                 else
 608                         SetLineIndentation(line, indentOfLine - IndentSize());
 609         }
 610 }
 611
 612 void Document::ConvertLineEnds(int eolModeSet) {
 613         BeginUndoAction();
 614         for (int pos = 0; pos < Length(); pos++) {
 615                 if (cb.CharAt(pos) == '\r') {
 616                         if (cb.CharAt(pos+1) == '\n') {
 617                                 if (eolModeSet != SC_EOL_CRLF) {
 618                                         DeleteChars(pos, 2);
 619                                         if (eolModeSet == SC_EOL_CR)
 620                                                 InsertString(pos, "\r", 1);
 621                                         else
 622                                                 InsertString(pos, "\n", 1);
 623                                 } else {
 624                                         pos++;
 625                                 }
 626                         } else {
 627                                 if (eolModeSet != SC_EOL_CR) {
 628                                         DeleteChars(pos, 1);
 629                                         if (eolModeSet == SC_EOL_CRLF) {
 630                                                 InsertString(pos, "\r\n", 2);
 631                                                 pos++;
 632                                         } else {
 633                                                 InsertString(pos, "\n", 1);
 634                                         }
 635                                 }
 636                         }
 637                 } else if (cb.CharAt(pos) == '\n') {
 638                         if (eolModeSet != SC_EOL_LF) {
 639                                 DeleteChars(pos, 1);
 640                                 if (eolModeSet == SC_EOL_CRLF) {
 641                                         InsertString(pos, "\r\n", 2);
 642                                         pos++;
 643                                 } else {
 644                                         InsertString(pos, "\r", 1);
 645                                 }
 646                         }
 647                 }
 648         }
 649         EndUndoAction();
 650 }
 651
 652 bool Document::IsWordChar(unsigned char ch) {
 653         if ((SC_CP_UTF8 == dbcsCodePage) && (ch >0x80))
 654                 return true;
 655         return wordchars[ch];
 656 }
 657
 658 int Document::ExtendWordSelect(int pos, int delta) {
 659         if (delta < 0) {
 660                 while (pos > 0 && IsWordChar(cb.CharAt(pos - 1)))
 661                         pos--;
 662         } else {
 663                 while (pos < (Length()) && IsWordChar(cb.CharAt(pos)))
 664                         pos++;
 665         }
 666         return pos;
 667 }
 668
 669 int Document::NextWordStart(int pos, int delta) {
 670         if (delta < 0) {
 671                 while (pos > 0 && (cb.CharAt(pos - 1) == ' ' || cb.CharAt(pos - 1) == '\t'))
 672                         pos--;
 673                 if (isspace(cb.CharAt(pos - 1))) {      // Back up to previous line
 674                         while (pos > 0 && isspace(cb.CharAt(pos - 1)))
 675                                 pos--;
 676                 } else {
 677                         bool startAtWordChar = IsWordChar(cb.CharAt(pos - 1));
 678                         while (pos > 0 && !isspace(cb.CharAt(pos - 1)) && (startAtWordChar == IsWordChar(cb.CharAt(pos - 1))))
 679                                 pos--;
 680                 }
 681         } else {
 682                 bool startAtWordChar = IsWordChar(cb.CharAt(pos));
 683                 while (pos < (Length()) && isspace(cb.CharAt(pos)))
 684                         pos++;
 685                 while (pos < (Length()) && !isspace(cb.CharAt(pos)) && (startAtWordChar == IsWordChar(cb.CharAt(pos))))
 686                         pos++;
 687                 while (pos < (Length()) && (cb.CharAt(pos) == ' ' || cb.CharAt(pos) == '\t'))
 688                         pos++;
 689         }
 690         return pos;
 691 }
 692
 693 bool Document::IsWordAt(int start, int end) {
 694         int lengthDoc = Length();
 695         if (start > 0) {
 696                 char ch = CharAt(start - 1);
 697                 if (IsWordChar(ch))
 698                         return false;
 699         }
 700         if (end < lengthDoc - 1) {
 701                 char ch = CharAt(end);
 702                 if (IsWordChar(ch))
 703                         return false;
 704         }
 705         return true;
 706 }
 707
 708 // Find text in document, supporting both forward and backward
 709 // searches (just pass minPos > maxPos to do a backward search)
 710 // Has not been tested with backwards DBCS searches yet.
 711 long Document::FindText(int minPos, int maxPos, const char *s, bool caseSensitive, bool word) {
 712         bool forward = minPos <= maxPos;
 713         int increment = forward ? 1 : -1;
 714
 715         // Range endpoints should not be inside DBCS characters, but just in case, move them.
 716         int startPos = MovePositionOutsideChar(minPos, increment, false);
 717         int endPos = MovePositionOutsideChar(maxPos, increment, false);
 718
 719         // Compute actual search ranges needed
 720         int lengthFind = strlen(s);
 721         int endSearch = endPos;
 722         if (startPos <= endPos) {
 723                 endSearch = endPos - lengthFind + 1;
 724         }
 725         //Platform::DebugPrintf("Find %d %d %s %d\n", startPos, endPos, ft->lpstrText, lengthFind);
 726         char firstChar = s[0];
 727         if (!caseSensitive)
 728                 firstChar = static_cast<char>(toupper(firstChar));
 729         int pos = startPos;
 730         while (forward ? (pos < endSearch) : (pos >= endSearch)) {
 731                 char ch = CharAt(pos);
 732                 if (caseSensitive) {
 733                         if (ch == firstChar) {
 734                                 bool found = true;
 735                                 for (int posMatch = 1; posMatch < lengthFind && found; posMatch++) {
 736                                         ch = CharAt(pos + posMatch);
 737                                         if (ch != s[posMatch])
 738                                                 found = false;
 739                                 }
 740                                 if (found) {
 741                                         if ((!word) || IsWordAt(pos, pos + lengthFind))
 742                                                 return pos;
 743                                 }
 744                         }
 745                 } else {
 746                         if (toupper(ch) == firstChar) {
 747                                 bool found = true;
 748                                 for (int posMatch = 1; posMatch < lengthFind && found; posMatch++) {
 749                                         ch = CharAt(pos + posMatch);
 750                                         if (toupper(ch) != toupper(s[posMatch]))
 751                                                 found = false;
 752                                 }
 753                                 if (found) {
 754                                         if ((!word) || IsWordAt(pos, pos + lengthFind))
 755                                                 return pos;
 756                                 }
 757                         }
 758                 }
 759                 pos += increment;
 760                 if (dbcsCodePage) {
 761                         // Ensure trying to match from start of character
 762                         pos = MovePositionOutsideChar(pos, increment, false);
 763                 }
 764         }
 765         //Platform::DebugPrintf("Not found\n");
 766         return - 1;
 767 }
 768
 769 int Document::LinesTotal() {
 770         return cb.Lines();
 771 }
 772
 773 void Document::ChangeCase(Range r, bool makeUpperCase) {
 774         for (int pos=r.start; pos<r.end; pos++) {
 775                 char ch = CharAt(pos);
 776                 if (dbcsCodePage && IsDBCS(pos)) {
 777                         pos += LenChar(pos);
 778                 } else {
 779                         if (makeUpperCase) {
 780                                 if (islower(ch)) {
 781                                         ChangeChar(pos, static_cast<char>(toupper(ch)));
 782                                 }
 783                         } else {
 784                                 if (isupper(ch)) {
 785                                         ChangeChar(pos, static_cast<char>(tolower(ch)));
 786                                 }
 787                         }
 788                 }
 789         }
 790 }
 791
 792 void Document::SetWordChars(unsigned char *chars) {
 793         int ch;
 794         for (ch = 0; ch < 256; ch++) {
 795                 wordchars[ch] = false;
 796         }
 797         if (chars) {
 798                 while (*chars) {
 799                         wordchars[*chars] = true;
 800                         chars++;
 801                 }
 802         } else {
 803                 for (ch = 0; ch < 256; ch++) {
 804                         wordchars[ch] = isalnum(ch) || ch == '_';
 805                 }
 806         }
 807 }
 808
 809 void Document::SetStylingBits(int bits) {
 810         stylingBits = bits;
 811         stylingBitsMask = 0;
 812         for (int bit=0; bit<stylingBits; bit++) {
 813                 stylingBitsMask <<= 1;
 814                 stylingBitsMask |= 1;
 815         }
 816 }
 817
 818 void Document::StartStyling(int position, char mask) {
 819         stylingPos = position;
 820         stylingMask = mask;
 821 }
 822
 823 void Document::SetStyleFor(int length, char style) {
 824         if (enteredCount == 0) {
 825                 enteredCount++;
 826                 int prevEndStyled = endStyled;
 827                 if (cb.SetStyleFor(stylingPos, length, style, stylingMask)) {
 828                         DocModification mh(SC_MOD_CHANGESTYLE | SC_PERFORMED_USER,
 829                                 prevEndStyled, length);
 830                         NotifyModified(mh);
 831                 }
 832                 stylingPos += length;
 833                 endStyled = stylingPos;
 834                 enteredCount--;
 835         }
 836 }
 837
 838 void Document::SetStyles(int length, char *styles) {
 839         if (enteredCount == 0) {
 840                 enteredCount++;
 841                 int prevEndStyled = endStyled;
 842                 bool didChange = false;
 843                 for (int iPos = 0; iPos < length; iPos++, stylingPos++) {
 844                         if (cb.SetStyleAt(stylingPos, styles[iPos], stylingMask)) {
 845                                 didChange = true;
 846                         }
 847                 }
 848                 endStyled = stylingPos;
 849                 if (didChange) {
 850                         DocModification mh(SC_MOD_CHANGESTYLE | SC_PERFORMED_USER,
 851                                 prevEndStyled, endStyled - prevEndStyled);
 852                         NotifyModified(mh);
 853                 }
 854                 enteredCount--;
 855         }
 856 }
 857
 858 bool Document::EnsureStyledTo(int pos) {
 859         // Ask the watchers to style, and stop as soon as one responds.
 860         for (int i = 0; pos > GetEndStyled() && i < lenWatchers; i++)
 861                 watchers[i].watcher->NotifyStyleNeeded(this, watchers[i].userData, pos);
 862         return pos <= GetEndStyled();
 863 }
 864
 865 bool Document::AddWatcher(DocWatcher *watcher, void *userData) {
 866         for (int i = 0; i < lenWatchers; i++) {
 867                 if ((watchers[i].watcher == watcher) &&
 868                         (watchers[i].userData == userData))
 869                         return false;
 870         }
 871         WatcherWithUserData *pwNew = new WatcherWithUserData[lenWatchers + 1];
 872         if (!pwNew)
 873                 return false;
 874         for (int j = 0; j < lenWatchers; j++)
 875                 pwNew[j] = watchers[j];
 876         pwNew[lenWatchers].watcher = watcher;
 877         pwNew[lenWatchers].userData = userData;
 878         delete []watchers;
 879         watchers = pwNew;
 880         lenWatchers++;
 881         return true;
 882 }
 883
 884 bool Document::RemoveWatcher(DocWatcher *watcher, void *userData) {
 885         for (int i = 0; i < lenWatchers; i++) {
 886                 if ((watchers[i].watcher == watcher) &&
 887                         (watchers[i].userData == userData)) {
 888                         if (lenWatchers == 1) {
 889                                 delete []watchers;
 890                                 watchers = 0;
 891                                 lenWatchers = 0;
 892                         } else {
 893                                 WatcherWithUserData *pwNew = new WatcherWithUserData[lenWatchers];
 894                                 if (!pwNew)
 895                                         return false;
 896                                 for (int j = 0; j < lenWatchers - 1; j++) {
 897                                         pwNew[j] = (j < i) ? watchers[j] : watchers[j + 1];
 898                                 }
 899                                 delete []watchers;
 900                                 watchers = pwNew;
 901                                 lenWatchers--;
 902                         }
 903                         return true;
 904                 }
 905         }
 906         return false;
 907 }
 908
 909 void Document::NotifyModifyAttempt() {
 910         for (int i = 0; i < lenWatchers; i++) {
 911                 watchers[i].watcher->NotifyModifyAttempt(this, watchers[i].userData);
 912         }
 913 }
 914
 915 void Document::NotifySavePoint(bool atSavePoint) {
 916         for (int i = 0; i < lenWatchers; i++) {
 917                 watchers[i].watcher->NotifySavePoint(this, watchers[i].userData, atSavePoint);
 918         }
 919 }
 920
 921 void Document::NotifyModified(DocModification mh) {
 922         for (int i = 0; i < lenWatchers; i++) {
 923                 watchers[i].watcher->NotifyModified(this, mh, watchers[i].userData);
 924         }
 925 }