src/stc/scintilla/src/LexPython.cxx

   1 // Scintilla source code edit control
   2 /** @file LexPython.cxx
   3  ** Lexer for Python.
   4  **/
   5 // Copyright 1998-2002 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 <ctype.h>
  11 #include <stdio.h>
  12 #include <stdarg.h>
  13
  14 #include "Platform.h"
  15
  16 #include "PropSet.h"
  17 #include "Accessor.h"
  18 #include "StyleContext.h"
  19 #include "KeyWords.h"
  20 #include "Scintilla.h"
  21 #include "SciLexer.h"
  22
  23 #ifdef SCI_NAMESPACE
  24 using namespace Scintilla;
  25 #endif
  26
  27 /* kwCDef, kwCTypeName only used for Cython */
  28 enum kwType { kwOther, kwClass, kwDef, kwImport, kwCDef, kwCTypeName };
  29
  30 static const int indicatorWhitespace = 1;
  31
  32 static bool IsPyComment(Accessor &styler, int pos, int len) {
  33         return len > 0 && styler[pos] == '#';
  34 }
  35
  36 enum literalsAllowed { litNone=0, litU=1, litB=2};
  37
  38 static bool IsPyStringTypeChar(int ch, literalsAllowed allowed) {
  39         return
  40                 ((allowed & litB) && (ch == 'b' || ch == 'B')) ||
  41                 ((allowed & litU) && (ch == 'u' || ch == 'U'));
  42 }
  43
  44 static bool IsPyStringStart(int ch, int chNext, int chNext2, literalsAllowed allowed) {
  45         if (ch == '\'' || ch == '"')
  46                 return true;
  47         if (IsPyStringTypeChar(ch, allowed)) {
  48                 if (chNext == '"' || chNext == '\'')
  49                         return true;
  50                 if ((chNext == 'r' || chNext == 'R') && (chNext2 == '"' || chNext2 == '\''))
  51                         return true;
  52         }
  53         if ((ch == 'r' || ch == 'R') && (chNext == '"' || chNext == '\''))
  54                 return true;
  55
  56         return false;
  57 }
  58
  59 /* Return the state to use for the string starting at i; *nextIndex will be set to the first index following the quote(s) */
  60 static int GetPyStringState(Accessor &styler, int i, unsigned int *nextIndex, literalsAllowed allowed) {
  61         char ch = styler.SafeGetCharAt(i);
  62         char chNext = styler.SafeGetCharAt(i + 1);
  63
  64         // Advance beyond r, u, or ur prefix (or r, b, or br in Python 3.0), but bail if there are any unexpected chars
  65         if (ch == 'r' || ch == 'R') {
  66                 i++;
  67                 ch = styler.SafeGetCharAt(i);
  68                 chNext = styler.SafeGetCharAt(i + 1);
  69         } else if (IsPyStringTypeChar(ch, allowed)) {
  70                 if (chNext == 'r' || chNext == 'R')
  71                         i += 2;
  72                 else
  73                         i += 1;
  74                 ch = styler.SafeGetCharAt(i);
  75                 chNext = styler.SafeGetCharAt(i + 1);
  76         }
  77
  78         if (ch != '"' && ch != '\'') {
  79                 *nextIndex = i + 1;
  80                 return SCE_P_DEFAULT;
  81         }
  82
  83         if (ch == chNext && ch == styler.SafeGetCharAt(i + 2)) {
  84                 *nextIndex = i + 3;
  85
  86                 if (ch == '"')
  87                         return SCE_P_TRIPLEDOUBLE;
  88                 else
  89                         return SCE_P_TRIPLE;
  90         } else {
  91                 *nextIndex = i + 1;
  92
  93                 if (ch == '"')
  94                         return SCE_P_STRING;
  95                 else
  96                         return SCE_P_CHARACTER;
  97         }
  98 }
  99
 100 static inline bool IsAWordChar(int ch) {
 101         return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
 102 }
 103
 104 static inline bool IsAWordStart(int ch) {
 105         return (ch < 0x80) && (isalnum(ch) || ch == '_');
 106 }
 107
 108 static void ColourisePyDoc(unsigned int startPos, int length, int initStyle,
 109         WordList *keywordlists[], Accessor &styler) {
 110
 111         int endPos = startPos + length;
 112
 113         // Backtrack to previous line in case need to fix its tab whinging
 114         int lineCurrent = styler.GetLine(startPos);
 115         if (startPos > 0) {
 116                 if (lineCurrent > 0) {
 117                         lineCurrent--;
 118                         // Look for backslash-continued lines
 119                         while (lineCurrent > 0) {
 120                                 int eolPos = styler.LineStart(lineCurrent) - 1;
 121                                 int eolStyle = styler.StyleAt(eolPos);
 122                                 if (eolStyle == SCE_P_STRING
 123                                     || eolStyle == SCE_P_CHARACTER
 124                                     || eolStyle == SCE_P_STRINGEOL) {
 125                                         lineCurrent -= 1;
 126                                 } else {
 127                                         break;
 128                                 }
 129                         }
 130                         startPos = styler.LineStart(lineCurrent);
 131                 }
 132                 initStyle = startPos == 0 ? SCE_P_DEFAULT : styler.StyleAt(startPos - 1);
 133         }
 134
 135         WordList &keywords = *keywordlists[0];
 136         WordList &keywords2 = *keywordlists[1];
 137
 138         // property tab.timmy.whinge.level
 139         //      For Python code, checks whether indenting is consistent.
 140         //      The default, 0 turns off indentation checking,
 141         //      1 checks whether each line is potentially inconsistent with the previous line,
 142         //      2 checks whether any space characters occur before a tab character in the indentation,
 143         //      3 checks whether any spaces are in the indentation, and
 144         //      4 checks for any tab characters in the indentation.
 145         //      1 is a good level to use.
 146         const int whingeLevel = styler.GetPropertyInt("tab.timmy.whinge.level");
 147
 148         // property lexer.python.literals.binary
 149         //      Set to 0 to not recognise Python 3 binary and octal literals: 0b1011 0o712.
 150         bool base2or8Literals = styler.GetPropertyInt("lexer.python.literals.binary", 1) != 0;
 151
 152         // property lexer.python.strings.u
 153         //      Set to 0 to not recognise Python Unicode literals u"x" as used before Python 3.
 154         literalsAllowed allowedLiterals = (styler.GetPropertyInt("lexer.python.strings.u", 1)) ? litU : litNone;
 155
 156         // property lexer.python.strings.b
 157         //      Set to 0 to not recognise Python 3 bytes literals b"x".
 158         if (styler.GetPropertyInt("lexer.python.strings.b", 1))
 159                 allowedLiterals = static_cast<literalsAllowed>(allowedLiterals | litB);
 160
 161         // property lexer.python.strings.over.newline
 162         //      Set to 1 to allow strings to span newline characters.
 163         bool stringsOverNewline = styler.GetPropertyInt("lexer.python.strings.over.newline") != 0;
 164
 165         initStyle = initStyle & 31;
 166         if (initStyle == SCE_P_STRINGEOL) {
 167                 initStyle = SCE_P_DEFAULT;
 168         }
 169
 170         kwType kwLast = kwOther;
 171         int spaceFlags = 0;
 172         styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
 173         bool base_n_number = false;
 174
 175         StyleContext sc(startPos, endPos - startPos, initStyle, styler);
 176
 177         bool indentGood = true;
 178         int startIndicator = sc.currentPos;
 179         bool inContinuedString = false;
 180
 181         for (; sc.More(); sc.Forward()) {
 182
 183                 if (sc.atLineStart) {
 184                         styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
 185                         indentGood = true;
 186                         if (whingeLevel == 1) {
 187                                 indentGood = (spaceFlags & wsInconsistent) == 0;
 188                         } else if (whingeLevel == 2) {
 189                                 indentGood = (spaceFlags & wsSpaceTab) == 0;
 190                         } else if (whingeLevel == 3) {
 191                                 indentGood = (spaceFlags & wsSpace) == 0;
 192                         } else if (whingeLevel == 4) {
 193                                 indentGood = (spaceFlags & wsTab) == 0;
 194                         }
 195                         if (!indentGood) {
 196                                 styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 0);
 197                                 startIndicator = sc.currentPos;
 198                         }
 199                 }
 200
 201                 if (sc.atLineEnd) {
 202                         if ((sc.state == SCE_P_DEFAULT) ||
 203                                 (sc.state == SCE_P_TRIPLE) ||
 204                                 (sc.state == SCE_P_TRIPLEDOUBLE)) {
 205                                 // Perform colourisation of white space and triple quoted strings at end of each line to allow
 206                                 // tab marking to work inside white space and triple quoted strings
 207                                 sc.SetState(sc.state);
 208                         }
 209                         lineCurrent++;
 210                         if ((sc.state == SCE_P_STRING) || (sc.state == SCE_P_CHARACTER)) {
 211                                 if (inContinuedString || stringsOverNewline) {
 212                                         inContinuedString = false;
 213                                 } else {
 214                                         sc.ChangeState(SCE_P_STRINGEOL);
 215                                         sc.ForwardSetState(SCE_P_DEFAULT);
 216                                 }
 217                         }
 218                         if (!sc.More())
 219                                 break;
 220                 }
 221
 222                 bool needEOLCheck = false;
 223
 224                 // Check for a state end
 225                 if (sc.state == SCE_P_OPERATOR) {
 226                         kwLast = kwOther;
 227                         sc.SetState(SCE_P_DEFAULT);
 228                 } else if (sc.state == SCE_P_NUMBER) {
 229                         if (!IsAWordChar(sc.ch) &&
 230                                 !(!base_n_number && ((sc.ch == '+' || sc.ch == '-') && (sc.chPrev == 'e' || sc.chPrev == 'E')))) {
 231                                 sc.SetState(SCE_P_DEFAULT);
 232                         }
 233                 } else if (sc.state == SCE_P_IDENTIFIER) {
 234                         if ((sc.ch == '.') || (!IsAWordChar(sc.ch))) {
 235                                 char s[100];
 236                                 sc.GetCurrent(s, sizeof(s));
 237                                 int style = SCE_P_IDENTIFIER;
 238                                 if ((kwLast == kwImport) && (strcmp(s, "as") == 0)) {
 239                                         style = SCE_P_WORD;
 240                                 } else if (keywords.InList(s)) {
 241                                         style = SCE_P_WORD;
 242                                 } else if (kwLast == kwClass) {
 243                                         style = SCE_P_CLASSNAME;
 244                                 } else if (kwLast == kwDef) {
 245                                         style = SCE_P_DEFNAME;
 246                                 } else if (kwLast == kwCDef) {
 247                                         int pos = sc.currentPos;
 248                                         unsigned char ch = styler.SafeGetCharAt(pos, '\0');
 249                                         while (ch != '\0') {
 250                                                 if (ch == '(') {
 251                                                         style = SCE_P_DEFNAME;
 252                                                         break;
 253                                                 } else if (ch == ':') {
 254                                                         style = SCE_P_CLASSNAME;
 255                                                         break;
 256                                                 } else if (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') {
 257                                                         pos++;
 258                                                         ch = styler.SafeGetCharAt(pos, '\0');
 259                                                 } else {
 260                                                         break;
 261                                                 }
 262                                         }
 263                                 } else if (keywords2.InList(s)) {
 264                                         style = SCE_P_WORD2;
 265                                 }
 266                                 sc.ChangeState(style);
 267                                 sc.SetState(SCE_P_DEFAULT);
 268                                 if (style == SCE_P_WORD) {
 269                                         if (0 == strcmp(s, "class"))
 270                                                 kwLast = kwClass;
 271                                         else if (0 == strcmp(s, "def"))
 272                                                 kwLast = kwDef;
 273                                         else if (0 == strcmp(s, "import"))
 274                                                 kwLast = kwImport;
 275                                         else if (0 == strcmp(s, "cdef"))
 276                                                 kwLast = kwCDef;
 277                                         else if (0 == strcmp(s, "cimport"))
 278                                                 kwLast = kwImport;
 279                                         else if (kwLast != kwCDef)
 280                                                 kwLast = kwOther;
 281                                 } else if (kwLast != kwCDef) {
 282                                         kwLast = kwOther;
 283                                 }
 284                         }
 285                 } else if ((sc.state == SCE_P_COMMENTLINE) || (sc.state == SCE_P_COMMENTBLOCK)) {
 286                         if (sc.ch == '\r' || sc.ch == '\n') {
 287                                 sc.SetState(SCE_P_DEFAULT);
 288                         }
 289                 } else if (sc.state == SCE_P_DECORATOR) {
 290                         if (!IsAWordChar(sc.ch)) {
 291                                 sc.SetState(SCE_P_DEFAULT);
 292                         }
 293                 } else if ((sc.state == SCE_P_STRING) || (sc.state == SCE_P_CHARACTER)) {
 294                         if (sc.ch == '\\') {
 295                                 if ((sc.chNext == '\r') && (sc.GetRelative(2) == '\n')) {
 296                                         sc.Forward();
 297                                 }
 298                                 if (sc.chNext == '\n' || sc.chNext == '\r') {
 299                                         inContinuedString = true;
 300                                 } else {
 301                                         // Don't roll over the newline.
 302                                         sc.Forward();
 303                                 }
 304                         } else if ((sc.state == SCE_P_STRING) && (sc.ch == '\"')) {
 305                                 sc.ForwardSetState(SCE_P_DEFAULT);
 306                                 needEOLCheck = true;
 307                         } else if ((sc.state == SCE_P_CHARACTER) && (sc.ch == '\'')) {
 308                                 sc.ForwardSetState(SCE_P_DEFAULT);
 309                                 needEOLCheck = true;
 310                         }
 311                 } else if (sc.state == SCE_P_TRIPLE) {
 312                         if (sc.ch == '\\') {
 313                                 sc.Forward();
 314                         } else if (sc.Match("\'\'\'")) {
 315                                 sc.Forward();
 316                                 sc.Forward();
 317                                 sc.ForwardSetState(SCE_P_DEFAULT);
 318                                 needEOLCheck = true;
 319                         }
 320                 } else if (sc.state == SCE_P_TRIPLEDOUBLE) {
 321                         if (sc.ch == '\\') {
 322                                 sc.Forward();
 323                         } else if (sc.Match("\"\"\"")) {
 324                                 sc.Forward();
 325                                 sc.Forward();
 326                                 sc.ForwardSetState(SCE_P_DEFAULT);
 327                                 needEOLCheck = true;
 328                         }
 329                 }
 330
 331                 if (!indentGood && !IsASpaceOrTab(sc.ch)) {
 332                         styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 1);
 333                         startIndicator = sc.currentPos;
 334                         indentGood = true;
 335                 }
 336
 337                 // One cdef line, clear kwLast only at end of line
 338                 if (kwLast == kwCDef && sc.atLineEnd) {
 339                         kwLast = kwOther;
 340                 }
 341
 342                 // State exit code may have moved on to end of line
 343                 if (needEOLCheck && sc.atLineEnd) {
 344                         lineCurrent++;
 345                         styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
 346                         if (!sc.More())
 347                                 break;
 348                 }
 349
 350                 // Check for a new state starting character
 351                 if (sc.state == SCE_P_DEFAULT) {
 352                         if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
 353                                 if (sc.ch == '0' && (sc.chNext == 'x' || sc.chNext == 'X')) {
 354                                         base_n_number = true;
 355                                         sc.SetState(SCE_P_NUMBER);
 356                                 } else if (sc.ch == '0' &&
 357                                         (sc.chNext == 'o' || sc.chNext == 'O' || sc.chNext == 'b' || sc.chNext == 'B')) {
 358                                         if (base2or8Literals) {
 359                                                 base_n_number = true;
 360                                                 sc.SetState(SCE_P_NUMBER);
 361                                         } else {
 362                                                 sc.SetState(SCE_P_NUMBER);
 363                                                 sc.ForwardSetState(SCE_P_IDENTIFIER);
 364                                         }
 365                                 } else {
 366                                         base_n_number = false;
 367                                         sc.SetState(SCE_P_NUMBER);
 368                                 }
 369                         } else if ((isascii(sc.ch) && isoperator(static_cast<char>(sc.ch))) || sc.ch == '`') {
 370                                 sc.SetState(SCE_P_OPERATOR);
 371                         } else if (sc.ch == '#') {
 372                                 sc.SetState(sc.chNext == '#' ? SCE_P_COMMENTBLOCK : SCE_P_COMMENTLINE);
 373                         } else if (sc.ch == '@') {
 374                                 sc.SetState(SCE_P_DECORATOR);
 375                         } else if (IsPyStringStart(sc.ch, sc.chNext, sc.GetRelative(2), allowedLiterals)) {
 376                                 unsigned int nextIndex = 0;
 377                                 sc.SetState(GetPyStringState(styler, sc.currentPos, &nextIndex, allowedLiterals));
 378                                 while (nextIndex > (sc.currentPos + 1) && sc.More()) {
 379                                         sc.Forward();
 380                                 }
 381                         } else if (IsAWordStart(sc.ch)) {
 382                                 sc.SetState(SCE_P_IDENTIFIER);
 383                         }
 384                 }
 385         }
 386         styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 0);
 387         sc.Complete();
 388 }
 389
 390 static bool IsCommentLine(int line, Accessor &styler) {
 391         int pos = styler.LineStart(line);
 392         int eol_pos = styler.LineStart(line + 1) - 1;
 393         for (int i = pos; i < eol_pos; i++) {
 394                 char ch = styler[i];
 395                 if (ch == '#')
 396                         return true;
 397                 else if (ch != ' ' && ch != '\t')
 398                         return false;
 399         }
 400         return false;
 401 }
 402
 403 static bool IsQuoteLine(int line, Accessor &styler) {
 404         int style = styler.StyleAt(styler.LineStart(line)) & 31;
 405         return ((style == SCE_P_TRIPLE) || (style == SCE_P_TRIPLEDOUBLE));
 406 }
 407
 408
 409 static void FoldPyDoc(unsigned int startPos, int length, int /*initStyle - unused*/,
 410                       WordList *[], Accessor &styler) {
 411         const int maxPos = startPos + length;
 412         const int maxLines = styler.GetLine(maxPos - 1);             // Requested last line
 413         const int docLines = styler.GetLine(styler.Length() - 1);  // Available last line
 414
 415         // property fold.comment.python
 416         //      This option enables folding multi-line comments when using the Python lexer.
 417         const bool foldComment = styler.GetPropertyInt("fold.comment.python") != 0;
 418
 419         // property fold.quotes.python
 420         //      This option enables folding multi-line quoted strings when using the Python lexer.
 421         const bool foldQuotes = styler.GetPropertyInt("fold.quotes.python") != 0;
 422
 423         const bool foldCompact = styler.GetPropertyInt("fold.compact") != 0;
 424
 425         // Backtrack to previous non-blank line so we can determine indent level
 426         // for any white space lines (needed esp. within triple quoted strings)
 427         // and so we can fix any preceding fold level (which is why we go back
 428         // at least one line in all cases)
 429         int spaceFlags = 0;
 430         int lineCurrent = styler.GetLine(startPos);
 431         int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, NULL);
 432         while (lineCurrent > 0) {
 433                 lineCurrent--;
 434                 indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, NULL);
 435                 if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG) &&
 436                         (!IsCommentLine(lineCurrent, styler)) &&
 437                         (!IsQuoteLine(lineCurrent, styler)))
 438                         break;
 439         }
 440         int indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
 441
 442         // Set up initial loop state
 443         startPos = styler.LineStart(lineCurrent);
 444         int prev_state = SCE_P_DEFAULT & 31;
 445         if (lineCurrent >= 1)
 446                 prev_state = styler.StyleAt(startPos - 1) & 31;
 447         int prevQuote = foldQuotes && ((prev_state == SCE_P_TRIPLE) || (prev_state == SCE_P_TRIPLEDOUBLE));
 448         int prevComment = 0;
 449         if (lineCurrent >= 1)
 450                 prevComment = foldComment && IsCommentLine(lineCurrent - 1, styler);
 451
 452         // Process all characters to end of requested range or end of any triple quote
 453         // or comment that hangs over the end of the range.  Cap processing in all cases
 454         // to end of document (in case of unclosed quote or comment at end).
 455         while ((lineCurrent <= docLines) && ((lineCurrent <= maxLines) || prevQuote || prevComment)) {
 456
 457                 // Gather info
 458                 int lev = indentCurrent;
 459                 int lineNext = lineCurrent + 1;
 460                 int indentNext = indentCurrent;
 461                 int quote = false;
 462                 if (lineNext <= docLines) {
 463                         // Information about next line is only available if not at end of document
 464                         indentNext = styler.IndentAmount(lineNext, &spaceFlags, NULL);
 465                         int style = styler.StyleAt(styler.LineStart(lineNext)) & 31;
 466                         quote = foldQuotes && ((style == SCE_P_TRIPLE) || (style == SCE_P_TRIPLEDOUBLE));
 467                 }
 468                 const int quote_start = (quote && !prevQuote);
 469                 const int quote_continue = (quote && prevQuote);
 470                 const int comment = foldComment && IsCommentLine(lineCurrent, styler);
 471                 const int comment_start = (comment && !prevComment && (lineNext <= docLines) &&
 472                                            IsCommentLine(lineNext, styler) && (lev > SC_FOLDLEVELBASE));
 473                 const int comment_continue = (comment && prevComment);
 474                 if ((!quote || !prevQuote) && !comment)
 475                         indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
 476                 if (quote)
 477                         indentNext = indentCurrentLevel;
 478                 if (indentNext & SC_FOLDLEVELWHITEFLAG)
 479                         indentNext = SC_FOLDLEVELWHITEFLAG | indentCurrentLevel;
 480
 481                 if (quote_start) {
 482                         // Place fold point at start of triple quoted string
 483                         lev |= SC_FOLDLEVELHEADERFLAG;
 484                 } else if (quote_continue || prevQuote) {
 485                         // Add level to rest of lines in the string
 486                         lev = lev + 1;
 487                 } else if (comment_start) {
 488                         // Place fold point at start of a block of comments
 489                         lev |= SC_FOLDLEVELHEADERFLAG;
 490                 } else if (comment_continue) {
 491                         // Add level to rest of lines in the block
 492                         lev = lev + 1;
 493                 }
 494
 495                 // Skip past any blank lines for next indent level info; we skip also
 496                 // comments (all comments, not just those starting in column 0)
 497                 // which effectively folds them into surrounding code rather
 498                 // than screwing up folding.
 499
 500                 while (!quote &&
 501                         (lineNext < docLines) &&
 502                         ((indentNext & SC_FOLDLEVELWHITEFLAG) ||
 503                          (lineNext <= docLines && IsCommentLine(lineNext, styler)))) {
 504
 505                         lineNext++;
 506                         indentNext = styler.IndentAmount(lineNext, &spaceFlags, NULL);
 507                 }
 508
 509                 const int levelAfterComments = indentNext & SC_FOLDLEVELNUMBERMASK;
 510                 const int levelBeforeComments = Platform::Maximum(indentCurrentLevel,levelAfterComments);
 511
 512                 // Now set all the indent levels on the lines we skipped
 513                 // Do this from end to start.  Once we encounter one line
 514                 // which is indented more than the line after the end of
 515                 // the comment-block, use the level of the block before
 516
 517                 int skipLine = lineNext;
 518                 int skipLevel = levelAfterComments;
 519
 520                 while (--skipLine > lineCurrent) {
 521                         int skipLineIndent = styler.IndentAmount(skipLine, &spaceFlags, NULL);
 522
 523                         if (foldCompact) {
 524                                 if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments)
 525                                         skipLevel = levelBeforeComments;
 526
 527                                 int whiteFlag = skipLineIndent & SC_FOLDLEVELWHITEFLAG;
 528
 529                                 styler.SetLevel(skipLine, skipLevel | whiteFlag);
 530                         } else {
 531                                 if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments &&
 532                                         !(skipLineIndent & SC_FOLDLEVELWHITEFLAG) &&
 533                                         !IsCommentLine(skipLine, styler))
 534                                         skipLevel = levelBeforeComments;
 535
 536                                 styler.SetLevel(skipLine, skipLevel);
 537                         }
 538                 }
 539
 540                 // Set fold header on non-quote/non-comment line
 541                 if (!quote && !comment && !(indentCurrent & SC_FOLDLEVELWHITEFLAG) ) {
 542                         if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK))
 543                                 lev |= SC_FOLDLEVELHEADERFLAG;
 544                 }
 545
 546                 // Keep track of triple quote and block comment state of previous line
 547                 prevQuote = quote;
 548                 prevComment = comment_start || comment_continue;
 549
 550                 // Set fold level for this line and move to next line
 551                 styler.SetLevel(lineCurrent, lev);
 552                 indentCurrent = indentNext;
 553                 lineCurrent = lineNext;
 554         }
 555
 556         // NOTE: Cannot set level of last line here because indentCurrent doesn't have
 557         // header flag set; the loop above is crafted to take care of this case!
 558         //styler.SetLevel(lineCurrent, indentCurrent);
 559 }
 560
 561 static const char * const pythonWordListDesc[] = {
 562         "Keywords",
 563         "Highlighted identifiers",
 564         0
 565 };
 566
 567 LexerModule lmPython(SCLEX_PYTHON, ColourisePyDoc, "python", FoldPyDoc,
 568                                          pythonWordListDesc);
 569