src/stc/scintilla/lexers/LexOScript.cxx

   1 // Scintilla source code edit control
   2 /** @file LexOScript.cxx
   3  ** Lexer for OScript sources; ocx files and/or OSpace dumps.
   4  ** OScript is a programming language used to develop applications for the
   5  ** Livelink server platform.
   6  **/
   7 // Written by Ferdinand Prantl <prantlf@gmail.com>, inspired by the code from
   8 // LexVB.cxx and LexPascal.cxx. The License.txt file describes the conditions
   9 // under which this software may be distributed.
  10
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <stdio.h>
  14 #include <stdarg.h>
  15 #include <assert.h>
  16 #include <ctype.h>
  17
  18 #include "ILexer.h"
  19 #include "Scintilla.h"
  20 #include "SciLexer.h"
  21
  22 #include "WordList.h"
  23 #include "LexAccessor.h"
  24 #include "Accessor.h"
  25 #include "StyleContext.h"
  26 #include "CharacterSet.h"
  27 #include "LexerModule.h"
  28
  29 #ifdef SCI_NAMESPACE
  30 using namespace Scintilla;
  31 #endif
  32
  33 // -----------------------------------------
  34 // Functions classifying a single character.
  35
  36 // This function is generic and should be probably moved to CharSet.h where
  37 // IsAlphaNumeric the others reside.
  38 inline bool IsAlpha(int ch) {
  39         return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z');
  40 }
  41
  42 static inline bool IsIdentifierChar(int ch) {
  43         // Identifiers cannot contain non-ASCII letters; a word with non-English
  44         // language-specific characters cannot be an identifier.
  45         return IsAlphaNumeric(ch) || ch == '_';
  46 }
  47
  48 static inline bool IsIdentifierStart(int ch) {
  49         // Identifiers cannot contain non-ASCII letters; a word with non-English
  50         // language-specific characters cannot be an identifier.
  51         return IsAlpha(ch) || ch == '_';
  52 }
  53
  54 static inline bool IsNumberChar(int ch, int chNext) {
  55         // Numeric constructs are not checked for lexical correctness. They are
  56         // expected to look like +1.23-E9 but actually any bunch of the following
  57         // characters will be styled as number.
  58         // KNOWN PROBLEM: if you put + or - operators immediately after a number
  59         // and the next operand starts with the letter E, the operator will not be
  60         // recognized and it will be styled together with the preceding number.
  61         // This should not occur; at least not often. The coding style recommends
  62         // putting spaces around operators.
  63         return IsADigit(ch) || toupper(ch) == 'E' || ch == '.' ||
  64                    ((ch == '-' || ch == '+') && toupper(chNext) == 'E');
  65 }
  66
  67 // This function checks for the start or a natural number without any symbols
  68 // or operators as a prefix; the IsPrefixedNumberStart should be called
  69 // immediately after this one to cover all possible numeric constructs.
  70 static inline bool IsNaturalNumberStart(int ch) {
  71         return IsADigit(ch) != 0;
  72 }
  73
  74 static inline bool IsPrefixedNumberStart(int ch, int chNext) {
  75         // KNOWN PROBLEM: if you put + or - operators immediately before a number
  76         // the operator will not be recognized and it will be styled together with
  77         // the succeeding number. This should not occur; at least not often. The
  78         // coding style recommends putting spaces around operators.
  79         return (ch == '.' || ch == '-' || ch == '+') && IsADigit(chNext);
  80 }
  81
  82 static inline bool IsOperator(int ch) {
  83         return strchr("%^&*()-+={}[]:;<>,/?!.~|\\", ch) != NULL;
  84 }
  85
  86 // ---------------------------------------------------------------
  87 // Functions classifying a token currently processed in the lexer.
  88
  89 // Checks if the current line starts with the preprocessor directive used
  90 // usually to introduce documentation comments: #ifdef DOC. This method is
  91 // supposed to be called if the line has been recognized as a preprocessor
  92 // directive already.
  93 static bool IsDocCommentStart(StyleContext &sc) {
  94         // Check the line back to its start only if the end looks promising.
  95         if (sc.LengthCurrent() == 10 && !IsAlphaNumeric(sc.ch)) {
  96                 char s[11];
  97                 sc.GetCurrentLowered(s, sizeof(s));
  98                 return strcmp(s, "#ifdef doc") == 0;
  99         }
 100         return false;
 101 }
 102
 103 // Checks if the current line starts with the preprocessor directive that
 104 // is complementary to the #ifdef DOC start: #endif. This method is supposed
 105 // to be called if the current state point to the documentation comment.
 106 // QUESTIONAL ASSUMPTION: The complete #endif directive is not checked; just
 107 // the starting #e. However, there is no other preprocessor directive with
 108 // the same starting letter and thus this optimization should always work.
 109 static bool IsDocCommentEnd(StyleContext &sc) {
 110         return sc.ch == '#' && sc.chNext == 'e';
 111 }
 112
 113 class IdentifierClassifier {
 114         WordList &keywords;  // Passed from keywords property.
 115         WordList &constants; // Passed from keywords2 property.
 116         WordList &operators; // Passed from keywords3 property.
 117         WordList &types;     // Passed from keywords4 property.
 118         WordList &functions; // Passed from keywords5 property.
 119         WordList &objects;   // Passed from keywords6 property.
 120
 121         IdentifierClassifier(IdentifierClassifier const&);
 122         IdentifierClassifier& operator=(IdentifierClassifier const&);
 123
 124 public:
 125         IdentifierClassifier(WordList *keywordlists[]) :
 126                 keywords(*keywordlists[0]), constants(*keywordlists[1]),
 127                 operators(*keywordlists[2]), types(*keywordlists[3]),
 128                 functions(*keywordlists[4]), objects(*keywordlists[5])
 129         {}
 130
 131         void ClassifyIdentifier(StyleContext &sc) {
 132                 // Opening parenthesis following an identifier makes it a possible
 133                 // function call.
 134                 // KNOWN PROBLEM: If some whitespace is inserted between the
 135                 // identifier and the parenthesis they will not be able to be
 136                 // recognized as a function call. This should not occur; at
 137                 // least not often. Such coding style would be weird.
 138                 if (sc.Match('(')) {
 139                         char s[100];
 140                         sc.GetCurrentLowered(s, sizeof(s));
 141                         // Before an opening brace can be control statements and
 142                         // operators too; function call is the last option.
 143                         if (keywords.InList(s)) {
 144                                 sc.ChangeState(SCE_OSCRIPT_KEYWORD);
 145                         } else if (operators.InList(s)) {
 146                                 sc.ChangeState(SCE_OSCRIPT_OPERATOR);
 147                         } else if (functions.InList(s)) {
 148                                 sc.ChangeState(SCE_OSCRIPT_FUNCTION);
 149                         } else {
 150                                 sc.ChangeState(SCE_OSCRIPT_METHOD);
 151                         }
 152                         sc.SetState(SCE_OSCRIPT_OPERATOR);
 153                 } else {
 154                         char s[100];
 155                         sc.GetCurrentLowered(s, sizeof(s));
 156                         // A dot following an identifier means an access to an object
 157                         // member. The related object identifier can be special.
 158                         // KNOWN PROBLEM: If there is whitespace between the identifier
 159                         // and the following dot, the identifier will not be recognized
 160                         // as an object in an object member access. If it is one of the
 161                         // listed static objects it will not be styled.
 162                         if (sc.Match('.') && objects.InList(s)) {
 163                                 sc.ChangeState(SCE_OSCRIPT_OBJECT);
 164                                 sc.SetState(SCE_OSCRIPT_OPERATOR);
 165                         } else {
 166                                 if (keywords.InList(s)) {
 167                                         sc.ChangeState(SCE_OSCRIPT_KEYWORD);
 168                                 } else if (constants.InList(s)) {
 169                                         sc.ChangeState(SCE_OSCRIPT_CONSTANT);
 170                                 } else if (operators.InList(s)) {
 171                                         sc.ChangeState(SCE_OSCRIPT_OPERATOR);
 172                                 } else if (types.InList(s)) {
 173                                         sc.ChangeState(SCE_OSCRIPT_TYPE);
 174                                 } else if (functions.InList(s)) {
 175                                         sc.ChangeState(SCE_OSCRIPT_FUNCTION);
 176                                 }
 177                                 sc.SetState(SCE_OSCRIPT_DEFAULT);
 178                         }
 179                 }
 180         }
 181 };
 182
 183 // ------------------------------------------------
 184 // Function colourising an excerpt of OScript code.
 185
 186 static void ColouriseOScriptDoc(unsigned int startPos, int length,
 187                                                                 int initStyle, WordList *keywordlists[],
 188                                                                 Accessor &styler) {
 189         // I wonder how whole-line styles ended by EOLN can escape the resetting
 190         // code in the loop below and overflow to the next line. Let us make sure
 191         // that a new line does not start with them carried from the previous one.
 192         // NOTE: An overflowing string is intentionally not checked; it reminds
 193         // the developer that the string must be ended on the same line.
 194         if (initStyle == SCE_OSCRIPT_LINE_COMMENT ||
 195                         initStyle == SCE_OSCRIPT_PREPROCESSOR) {
 196                 initStyle = SCE_OSCRIPT_DEFAULT;
 197         }
 198
 199         styler.StartAt(startPos);
 200         StyleContext sc(startPos, length, initStyle, styler);
 201         IdentifierClassifier identifierClassifier(keywordlists);
 202
 203         // It starts with true at the beginning of a line and changes to false as
 204         // soon as the first non-whitespace character has been processed.
 205         bool isFirstToken = true;
 206         // It starts with true at the beginning of a line and changes to false as
 207         // soon as the first identifier on the line is passed by.
 208         bool isFirstIdentifier = true;
 209         // It becomes false when #ifdef DOC (the preprocessor directive often
 210         // used to start a documentation comment) is encountered and remain false
 211         // until the end of the documentation block is not detected. This is done
 212         // by checking for the complementary #endif preprocessor directive.
 213         bool endDocComment = false;
 214
 215         for (; sc.More(); sc.Forward()) {
 216
 217                 if (sc.atLineStart) {
 218                         isFirstToken = true;
 219                         isFirstIdentifier = true;
 220                 // Detect the current state is neither whitespace nor identifier. It
 221                 // means that no next identifier can be the first token on the line.
 222                 } else if (isFirstIdentifier && sc.state != SCE_OSCRIPT_DEFAULT &&
 223                                    sc.state != SCE_OSCRIPT_IDENTIFIER) {
 224                         isFirstIdentifier = false;
 225                 }
 226
 227                 // Check if the current state should be changed.
 228                 if (sc.state == SCE_OSCRIPT_OPERATOR) {
 229                         // Multiple-symbol operators are marked by single characters.
 230                         sc.SetState(SCE_OSCRIPT_DEFAULT);
 231                 } else if (sc.state == SCE_OSCRIPT_IDENTIFIER) {
 232                         if (!IsIdentifierChar(sc.ch)) {
 233                                 // Colon after an identifier makes it a label if it is the
 234                                 // first token on the line.
 235                                 // KNOWN PROBLEM: If some whitespace is inserted between the
 236                                 // identifier and the colon they will not be recognized as a
 237                                 // label. This should not occur; at least not often. It would
 238                                 // make the code structure less legible and examples in the
 239                                 // Livelink documentation do not show it.
 240                                 if (sc.Match(':') && isFirstIdentifier) {
 241                                         sc.ChangeState(SCE_OSCRIPT_LABEL);
 242                                         sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 243                                 } else {
 244                                         identifierClassifier.ClassifyIdentifier(sc);
 245                                 }
 246                                 // Avoid a sequence of two words be mistaken for a label. A
 247                                 // switch case would be an example.
 248                                 isFirstIdentifier = false;
 249                         }
 250                 } else if (sc.state == SCE_OSCRIPT_GLOBAL) {
 251                         if (!IsIdentifierChar(sc.ch)) {
 252                                 sc.SetState(SCE_OSCRIPT_DEFAULT);
 253                         }
 254                 } else if (sc.state == SCE_OSCRIPT_PROPERTY) {
 255                         if (!IsIdentifierChar(sc.ch)) {
 256                                 // Any member access introduced by the dot operator is
 257                                 // initially marked as a property access. If an opening
 258                                 // parenthesis is detected later it is changed to method call.
 259                                 // KNOWN PROBLEM: The same as at the function call recognition
 260                                 // for SCE_OSCRIPT_IDENTIFIER above.
 261                                 if (sc.Match('(')) {
 262                                         sc.ChangeState(SCE_OSCRIPT_METHOD);
 263                                 }
 264                                 sc.SetState(SCE_OSCRIPT_DEFAULT);
 265                         }
 266                 } else if (sc.state == SCE_OSCRIPT_NUMBER) {
 267                         if (!IsNumberChar(sc.ch, sc.chNext)) {
 268                                 sc.SetState(SCE_OSCRIPT_DEFAULT);
 269                         }
 270                 } else if (sc.state == SCE_OSCRIPT_SINGLEQUOTE_STRING) {
 271                         if (sc.ch == '\'') {
 272                                 // Two consequential apostrophes convert to a single one.
 273                                 if (sc.chNext == '\'') {
 274                                         sc.Forward();
 275                                 } else {
 276                                         sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 277                                 }
 278                         } else if (sc.atLineEnd) {
 279                                 sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 280                         }
 281                 } else if (sc.state == SCE_OSCRIPT_DOUBLEQUOTE_STRING) {
 282                         if (sc.ch == '\"') {
 283                                 // Two consequential quotation marks convert to a single one.
 284                                 if (sc.chNext == '\"') {
 285                                         sc.Forward();
 286                                 } else {
 287                                         sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 288                                 }
 289                         } else if (sc.atLineEnd) {
 290                                 sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 291                         }
 292                 } else if (sc.state == SCE_OSCRIPT_BLOCK_COMMENT) {
 293                         if (sc.Match('*', '/')) {
 294                                 sc.Forward();
 295                                 sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 296                         }
 297                 } else if (sc.state == SCE_OSCRIPT_LINE_COMMENT) {
 298                         if (sc.atLineEnd) {
 299                                 sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 300                         }
 301                 } else if (sc.state == SCE_OSCRIPT_PREPROCESSOR) {
 302                         if (IsDocCommentStart(sc)) {
 303                                 sc.ChangeState(SCE_OSCRIPT_DOC_COMMENT);
 304                                 endDocComment = false;
 305                         } else if (sc.atLineEnd) {
 306                                 sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 307                         }
 308                 } else if (sc.state == SCE_OSCRIPT_DOC_COMMENT) {
 309                         // KNOWN PROBLEM: The first line detected that would close a
 310                         // conditional preprocessor block (#endif) the documentation
 311                         // comment block will end. (Nested #if-#endif blocks are not
 312                         // supported. Hopefully it will not occur often that a line
 313                         // within the text block would stat with #endif.
 314                         if (isFirstToken && IsDocCommentEnd(sc)) {
 315                                 endDocComment = true;
 316                         } else if (sc.atLineEnd && endDocComment) {
 317                                 sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
 318                         }
 319                 }
 320
 321                 // Check what state starts with the current character.
 322                 if (sc.state == SCE_OSCRIPT_DEFAULT) {
 323                         if (sc.Match('\'')) {
 324                                 sc.SetState(SCE_OSCRIPT_SINGLEQUOTE_STRING);
 325                         } else if (sc.Match('\"')) {
 326                                 sc.SetState(SCE_OSCRIPT_DOUBLEQUOTE_STRING);
 327                         } else if (sc.Match('/', '/')) {
 328                                 sc.SetState(SCE_OSCRIPT_LINE_COMMENT);
 329                                 sc.Forward();
 330                         } else if (sc.Match('/', '*')) {
 331                                 sc.SetState(SCE_OSCRIPT_BLOCK_COMMENT);
 332                                 sc.Forward();
 333                         } else if (isFirstToken && sc.Match('#')) {
 334                                 sc.SetState(SCE_OSCRIPT_PREPROCESSOR);
 335                         } else if (sc.Match('$')) {
 336                                 // Both process-global ($xxx) and thread-global ($$xxx)
 337                                 // variables are handled as one global.
 338                                 sc.SetState(SCE_OSCRIPT_GLOBAL);
 339                         } else if (IsNaturalNumberStart(sc.ch)) {
 340                                 sc.SetState(SCE_OSCRIPT_NUMBER);
 341                         } else if (IsPrefixedNumberStart(sc.ch, sc.chNext)) {
 342                                 sc.SetState(SCE_OSCRIPT_NUMBER);
 343                                 sc.Forward();
 344                         } else if (sc.Match('.') && IsIdentifierStart(sc.chNext)) {
 345                                 // Every object member access is marked as a property access
 346                                 // initially. The decision between property and method is made
 347                                 // after parsing the identifier and looking what comes then.
 348                                 // KNOWN PROBLEM: If there is whitespace between the following
 349                                 // identifier and the dot, the dot will not be recognized
 350                                 // as a member accessing operator. In turn, the identifier
 351                                 // will not be recognizable as a property or a method too.
 352                                 sc.SetState(SCE_OSCRIPT_OPERATOR);
 353                                 sc.Forward();
 354                                 sc.SetState(SCE_OSCRIPT_PROPERTY);
 355                         } else if (IsIdentifierStart(sc.ch)) {
 356                                 sc.SetState(SCE_OSCRIPT_IDENTIFIER);
 357                         } else if (IsOperator(sc.ch)) {
 358                                 sc.SetState(SCE_OSCRIPT_OPERATOR);
 359                         }
 360                 }
 361
 362                 if (isFirstToken && !IsASpaceOrTab(sc.ch)) {
 363                         isFirstToken = false;
 364                 }
 365         }
 366
 367         sc.Complete();
 368 }
 369
 370 // ------------------------------------------
 371 // Functions supporting OScript code folding.
 372
 373 static inline bool IsBlockComment(int style) {
 374         return style == SCE_OSCRIPT_BLOCK_COMMENT;
 375 }
 376
 377 static bool IsLineComment(int line, Accessor &styler) {
 378         int pos = styler.LineStart(line);
 379         int eolPos = styler.LineStart(line + 1) - 1;
 380         for (int i = pos; i < eolPos; i++) {
 381                 char ch = styler[i];
 382                 char chNext = styler.SafeGetCharAt(i + 1);
 383                 int style = styler.StyleAt(i);
 384                 if (ch == '/' && chNext == '/' && style == SCE_OSCRIPT_LINE_COMMENT) {
 385                         return true;
 386                 } else if (!IsASpaceOrTab(ch)) {
 387                         return false;
 388                 }
 389         }
 390         return false;
 391 }
 392
 393 static inline bool IsPreprocessor(int style) {
 394         return style == SCE_OSCRIPT_PREPROCESSOR ||
 395                    style == SCE_OSCRIPT_DOC_COMMENT;
 396 }
 397
 398 static void GetRangeLowered(unsigned int start, unsigned int end,
 399                                                         Accessor &styler, char *s, unsigned int len) {
 400         unsigned int i = 0;
 401         while (i < end - start + 1 && i < len - 1) {
 402                 s[i] = static_cast<char>(tolower(styler[start + i]));
 403                 i++;
 404         }
 405         s[i] = '\0';
 406 }
 407
 408 static void GetForwardWordLowered(unsigned int start, Accessor &styler,
 409                                                                   char *s, unsigned int len) {
 410         unsigned int i = 0;
 411         while (i < len - 1 && IsAlpha(styler.SafeGetCharAt(start + i))) {
 412                 s[i] = static_cast<char>(tolower(styler.SafeGetCharAt(start + i)));
 413                 i++;
 414         }
 415         s[i] = '\0';
 416 }
 417
 418 static void UpdatePreprocessorFoldLevel(int &levelCurrent,
 419                 unsigned int startPos, Accessor &styler) {
 420         char s[7]; // Size of the longest possible keyword + null.
 421         GetForwardWordLowered(startPos, styler, s, sizeof(s));
 422
 423         if (strcmp(s, "ifdef") == 0 ||
 424                 strcmp(s, "ifndef") == 0) {
 425                 levelCurrent++;
 426         } else if (strcmp(s, "endif") == 0) {
 427                 levelCurrent--;
 428                 if (levelCurrent < SC_FOLDLEVELBASE) {
 429                         levelCurrent = SC_FOLDLEVELBASE;
 430                 }
 431         }
 432 }
 433
 434 static void UpdateKeywordFoldLevel(int &levelCurrent, unsigned int lastStart,
 435                 unsigned int currentPos, Accessor &styler) {
 436         char s[9];
 437         GetRangeLowered(lastStart, currentPos, styler, s, sizeof(s));
 438
 439         if (strcmp(s, "if") == 0 || strcmp(s, "for") == 0 ||
 440                 strcmp(s, "switch") == 0 || strcmp(s, "function") == 0 ||
 441                 strcmp(s, "while") == 0 || strcmp(s, "repeat") == 0) {
 442                 levelCurrent++;
 443         } else if (strcmp(s, "end") == 0 || strcmp(s, "until") == 0) {
 444                 levelCurrent--;
 445                 if (levelCurrent < SC_FOLDLEVELBASE) {
 446                         levelCurrent = SC_FOLDLEVELBASE;
 447                 }
 448         }
 449 }
 450
 451 // ------------------------------
 452 // Function folding OScript code.
 453
 454 static void FoldOScriptDoc(unsigned int startPos, int length, int initStyle,
 455                                                    WordList *[], Accessor &styler) {
 456         bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
 457         bool foldPreprocessor = styler.GetPropertyInt("fold.preprocessor") != 0;
 458         bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
 459         int endPos = startPos + length;
 460         int visibleChars = 0;
 461         int lineCurrent = styler.GetLine(startPos);
 462         int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 463         int levelCurrent = levelPrev;
 464         char chNext = styler[startPos];
 465         int styleNext = styler.StyleAt(startPos);
 466         int style = initStyle;
 467         int lastStart = 0;
 468
 469         for (int i = startPos; i < endPos; i++) {
 470                 char ch = chNext;
 471                 chNext = styler.SafeGetCharAt(i + 1);
 472                 int stylePrev = style;
 473                 style = styleNext;
 474                 styleNext = styler.StyleAt(i + 1);
 475                 bool atLineEnd = (ch == '\r' && chNext != '\n') || (ch == '\n');
 476
 477                 if (foldComment && IsBlockComment(style)) {
 478                         if (!IsBlockComment(stylePrev)) {
 479                                 levelCurrent++;
 480                         } else if (!IsBlockComment(styleNext) && !atLineEnd) {
 481                                 // Comments do not end at end of line and the next character
 482                                 // may not be styled.
 483                                 levelCurrent--;
 484                         }
 485                 }
 486                 if (foldComment && atLineEnd && IsLineComment(lineCurrent, styler)) {
 487                         if (!IsLineComment(lineCurrent - 1, styler) &&
 488                                 IsLineComment(lineCurrent + 1, styler))
 489                                 levelCurrent++;
 490                         else if (IsLineComment(lineCurrent - 1, styler) &&
 491                                          !IsLineComment(lineCurrent+1, styler))
 492                                 levelCurrent--;
 493                 }
 494                 if (foldPreprocessor) {
 495                         if (ch == '#' && IsPreprocessor(style)) {
 496                                 UpdatePreprocessorFoldLevel(levelCurrent, i + 1, styler);
 497                         }
 498                 }
 499
 500                 if (stylePrev != SCE_OSCRIPT_KEYWORD && style == SCE_OSCRIPT_KEYWORD) {
 501                         lastStart = i;
 502                 }
 503                 if (stylePrev == SCE_OSCRIPT_KEYWORD) {
 504                         if(IsIdentifierChar(ch) && !IsIdentifierChar(chNext)) {
 505                                 UpdateKeywordFoldLevel(levelCurrent, lastStart, i, styler);
 506                         }
 507                 }
 508
 509                 if (!IsASpace(ch))
 510                         visibleChars++;
 511
 512                 if (atLineEnd) {
 513                         int level = levelPrev;
 514                         if (visibleChars == 0 && foldCompact)
 515                                 level |= SC_FOLDLEVELWHITEFLAG;
 516                         if ((levelCurrent > levelPrev) && (visibleChars > 0))
 517                                 level |= SC_FOLDLEVELHEADERFLAG;
 518                         if (level != styler.LevelAt(lineCurrent)) {
 519                                 styler.SetLevel(lineCurrent, level);
 520                         }
 521                         lineCurrent++;
 522                         levelPrev = levelCurrent;
 523                         visibleChars = 0;
 524                 }
 525         }
 526
 527         // If we did not reach EOLN in the previous loop, store the line level and
 528         // whitespace information. The rest will be filled in later.
 529         int lev = levelPrev;
 530         if (visibleChars == 0 && foldCompact)
 531                 lev |= SC_FOLDLEVELWHITEFLAG;
 532         styler.SetLevel(lineCurrent, lev);
 533 }
 534
 535 // --------------------------------------------
 536 // Declaration of the OScript lexer descriptor.
 537
 538 static const char * const oscriptWordListDesc[] = {
 539         "Keywords and reserved words",
 540         "Literal constants",
 541         "Literal operators",
 542         "Built-in value and reference types",
 543         "Built-in global functions",
 544         "Built-in static objects",
 545         0
 546 };
 547
 548 LexerModule lmOScript(SCLEX_OSCRIPT, ColouriseOScriptDoc, "oscript", FoldOScriptDoc, oscriptWordListDesc);