src/stc/scintilla/lexers/LexErlang.cxx

   1 // Scintilla source code edit control
   2 // Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
   3 // The License.txt file describes the conditions under which this software may be distributed.
   4 /** @file LexErlang.cxx
   5  ** Lexer for Erlang.
   6  ** Enhanced by Etienne 'Lenain' Girondel (lenaing@gmail.com)
   7  ** Originally wrote by Peter-Henry Mander,
   8  ** based on Matlab lexer by José Fonseca.
   9  **/
  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 static int is_radix(int radix, int ch) {
  34         int digit;
  35
  36         if (36 < radix || 2 > radix)
  37                 return 0;
  38
  39         if (isdigit(ch)) {
  40                 digit = ch - '0';
  41         } else if (isalnum(ch)) {
  42                 digit = toupper(ch) - 'A' + 10;
  43         } else {
  44                 return 0;
  45         }
  46
  47         return (digit < radix);
  48 }
  49
  50 typedef enum {
  51         STATE_NULL,
  52         COMMENT,
  53         COMMENT_FUNCTION,
  54         COMMENT_MODULE,
  55         COMMENT_DOC,
  56         COMMENT_DOC_MACRO,
  57         ATOM_UNQUOTED,
  58         ATOM_QUOTED,
  59         NODE_NAME_UNQUOTED,
  60         NODE_NAME_QUOTED,
  61         MACRO_START,
  62         MACRO_UNQUOTED,
  63         MACRO_QUOTED,
  64         RECORD_START,
  65         RECORD_UNQUOTED,
  66         RECORD_QUOTED,
  67         NUMERAL_START,
  68         NUMERAL_BASE_VALUE,
  69         NUMERAL_FLOAT,
  70         NUMERAL_EXPONENT,
  71         PREPROCESSOR
  72 } atom_parse_state_t;
  73
  74 static inline bool IsAWordChar(const int ch) {
  75         return (ch < 0x80) && (ch != ' ') && (isalnum(ch) || ch == '_');
  76 }
  77
  78 static void ColouriseErlangDoc(unsigned int startPos, int length, int initStyle,
  79                                                                 WordList *keywordlists[], Accessor &styler) {
  80
  81         StyleContext sc(startPos, length, initStyle, styler);
  82         WordList &reservedWords = *keywordlists[0];
  83         WordList &erlangBIFs = *keywordlists[1];
  84         WordList &erlangPreproc = *keywordlists[2];
  85         WordList &erlangModulesAtt = *keywordlists[3];
  86         WordList &erlangDoc = *keywordlists[4];
  87         WordList &erlangDocMacro = *keywordlists[5];
  88         int radix_digits = 0;
  89         int exponent_digits = 0;
  90         atom_parse_state_t parse_state = STATE_NULL;
  91         atom_parse_state_t old_parse_state = STATE_NULL;
  92         bool to_late_to_comment = false;
  93         char cur[100];
  94         int old_style = SCE_ERLANG_DEFAULT;
  95
  96         styler.StartAt(startPos);
  97
  98         for (; sc.More(); sc.Forward()) {
  99                 int style = SCE_ERLANG_DEFAULT;
 100                 if (STATE_NULL != parse_state) {
 101
 102                         switch (parse_state) {
 103
 104                                 case STATE_NULL : sc.SetState(SCE_ERLANG_DEFAULT); break;
 105
 106                         /* COMMENTS ------------------------------------------------------*/
 107                                 case COMMENT : {
 108                                         if (sc.ch != '%') {
 109                                                 to_late_to_comment = true;
 110                                         } else if (!to_late_to_comment && sc.ch == '%') {
 111                                                 // Switch to comment level 2 (Function)
 112                                                 sc.ChangeState(SCE_ERLANG_COMMENT_FUNCTION);
 113                                                 old_style = SCE_ERLANG_COMMENT_FUNCTION;
 114                                                 parse_state = COMMENT_FUNCTION;
 115                                                 sc.Forward();
 116                                         }
 117                                 }
 118                                 // V--- Falling through!
 119                                 case COMMENT_FUNCTION : {
 120                                         if (sc.ch != '%') {
 121                                                 to_late_to_comment = true;
 122                                         } else if (!to_late_to_comment && sc.ch == '%') {
 123                                                 // Switch to comment level 3 (Module)
 124                                                 sc.ChangeState(SCE_ERLANG_COMMENT_MODULE);
 125                                                 old_style = SCE_ERLANG_COMMENT_MODULE;
 126                                                 parse_state = COMMENT_MODULE;
 127                                                 sc.Forward();
 128                                         }
 129                                 }
 130                                 // V--- Falling through!
 131                                 case COMMENT_MODULE : {
 132                                         if (parse_state != COMMENT) {
 133                                                 // Search for comment documentation
 134                                                 if (sc.chNext == '@') {
 135                                                         old_parse_state = parse_state;
 136                                                         parse_state = ('{' == sc.ch)
 137                                                                                         ? COMMENT_DOC_MACRO
 138                                                                                         : COMMENT_DOC;
 139                                                         sc.ForwardSetState(sc.state);
 140                                                 }
 141                                         }
 142
 143                                         // All comments types fall here.
 144                                         if (sc.atLineEnd) {
 145                                                 to_late_to_comment = false;
 146                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 147                                                 parse_state = STATE_NULL;
 148                                         }
 149                                 } break;
 150
 151                                 case COMMENT_DOC :
 152                                 // V--- Falling through!
 153                                 case COMMENT_DOC_MACRO : {
 154
 155                                         if (!isalnum(sc.ch)) {
 156                                                 // Try to match documentation comment
 157                                                 sc.GetCurrent(cur, sizeof(cur));
 158
 159                                                 if (parse_state == COMMENT_DOC_MACRO
 160                                                         && erlangDocMacro.InList(cur)) {
 161                                                                 sc.ChangeState(SCE_ERLANG_COMMENT_DOC_MACRO);
 162                                                                 while (sc.ch != '}' && !sc.atLineEnd)
 163                                                                         sc.Forward();
 164                                                 } else if (erlangDoc.InList(cur)) {
 165                                                         sc.ChangeState(SCE_ERLANG_COMMENT_DOC);
 166                                                 } else {
 167                                                         sc.ChangeState(old_style);
 168                                                 }
 169
 170                                                 // Switch back to old state
 171                                                 sc.SetState(old_style);
 172                                                 parse_state = old_parse_state;
 173                                         }
 174
 175                                         if (sc.atLineEnd) {
 176                                                 to_late_to_comment = false;
 177                                                 sc.ChangeState(old_style);
 178                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 179                                                 parse_state = STATE_NULL;
 180                                         }
 181                                 } break;
 182
 183                         /* -------------------------------------------------------------- */
 184                         /* Atoms ---------------------------------------------------------*/
 185                                 case ATOM_UNQUOTED : {
 186                                         if ('@' == sc.ch){
 187                                                 parse_state = NODE_NAME_UNQUOTED;
 188                                         } else if (sc.ch == ':') {
 189                                                 // Searching for module name
 190                                                 if (sc.chNext == ' ') {
 191                                                         // error
 192                                                         sc.ChangeState(SCE_ERLANG_UNKNOWN);
 193                                                         parse_state = STATE_NULL;
 194                                                 } else {
 195                                                         sc.Forward();
 196                                                         if (isalnum(sc.ch))  {
 197                                                                 sc.GetCurrent(cur, sizeof(cur));
 198                                                                 sc.ChangeState(SCE_ERLANG_MODULES);
 199                                                                 sc.SetState(SCE_ERLANG_MODULES);
 200                                                         }
 201                                                 }
 202                                         } else if (!IsAWordChar(sc.ch)) {
 203
 204                                                 sc.GetCurrent(cur, sizeof(cur));
 205                                                 if (reservedWords.InList(cur)) {
 206                                                         style = SCE_ERLANG_KEYWORD;
 207                                                 } else if (erlangBIFs.InList(cur)
 208                                                                         && strcmp(cur,"erlang:")){
 209                                                         style = SCE_ERLANG_BIFS;
 210                                                 } else if (sc.ch == '(' || '/' == sc.ch){
 211                                                         style = SCE_ERLANG_FUNCTION_NAME;
 212                                                 } else {
 213                                                         style = SCE_ERLANG_ATOM;
 214                                                 }
 215
 216                                                 sc.ChangeState(style);
 217                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 218                                                 parse_state = STATE_NULL;
 219                                         }
 220
 221                                 } break;
 222
 223                                 case ATOM_QUOTED : {
 224                                         if ( '@' == sc.ch ){
 225                                                 parse_state = NODE_NAME_QUOTED;
 226                                         } else if ('\'' == sc.ch && '\\' != sc.chPrev) {
 227                                                 sc.ChangeState(SCE_ERLANG_ATOM);
 228                                                 sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 229                                                 parse_state = STATE_NULL;
 230                                         }
 231                                 } break;
 232
 233                         /* -------------------------------------------------------------- */
 234                         /* Node names ----------------------------------------------------*/
 235                                 case NODE_NAME_UNQUOTED : {
 236                                         if ('@' == sc.ch) {
 237                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 238                                                 parse_state = STATE_NULL;
 239                                         } else if (!IsAWordChar(sc.ch)) {
 240                                                 sc.ChangeState(SCE_ERLANG_NODE_NAME);
 241                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 242                                                 parse_state = STATE_NULL;
 243                                         }
 244                                 } break;
 245
 246                                 case NODE_NAME_QUOTED : {
 247                                         if ('@' == sc.ch) {
 248                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 249                                                 parse_state = STATE_NULL;
 250                                         } else if ('\'' == sc.ch && '\\' != sc.chPrev) {
 251                                                 sc.ChangeState(SCE_ERLANG_NODE_NAME_QUOTED);
 252                                                 sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 253                                                 parse_state = STATE_NULL;
 254                                         }
 255                                 } break;
 256
 257                         /* -------------------------------------------------------------- */
 258                         /* Records -------------------------------------------------------*/
 259                                 case RECORD_START : {
 260                                         if ('\'' == sc.ch) {
 261                                                 parse_state = RECORD_QUOTED;
 262                                         } else if (isalpha(sc.ch) && islower(sc.ch)) {
 263                                                 parse_state = RECORD_UNQUOTED;
 264                                         } else { // error
 265                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 266                                                 parse_state = STATE_NULL;
 267                                         }
 268                                 } break;
 269
 270                                 case RECORD_UNQUOTED : {
 271                                         if (!IsAWordChar(sc.ch)) {
 272                                                 sc.ChangeState(SCE_ERLANG_RECORD);
 273                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 274                                                 parse_state = STATE_NULL;
 275                                         }
 276                                 } break;
 277
 278                                 case RECORD_QUOTED : {
 279                                         if ('\'' == sc.ch && '\\' != sc.chPrev) {
 280                                                 sc.ChangeState(SCE_ERLANG_RECORD_QUOTED);
 281                                                 sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 282                                                 parse_state = STATE_NULL;
 283                                         }
 284                                 } break;
 285
 286                         /* -------------------------------------------------------------- */
 287                         /* Macros --------------------------------------------------------*/
 288                                 case MACRO_START : {
 289                                         if ('\'' == sc.ch) {
 290                                                 parse_state = MACRO_QUOTED;
 291                                         } else if (isalpha(sc.ch)) {
 292                                                 parse_state = MACRO_UNQUOTED;
 293                                         } else { // error
 294                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 295                                                 parse_state = STATE_NULL;
 296                                         }
 297                                 } break;
 298
 299                                 case MACRO_UNQUOTED : {
 300                                         if (!IsAWordChar(sc.ch)) {
 301                                                 sc.ChangeState(SCE_ERLANG_MACRO);
 302                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 303                                                 parse_state = STATE_NULL;
 304                                         }
 305                                 } break;
 306
 307                                 case MACRO_QUOTED : {
 308                                         if ('\'' == sc.ch && '\\' != sc.chPrev) {
 309                                                 sc.ChangeState(SCE_ERLANG_MACRO_QUOTED);
 310                                                 sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 311                                                 parse_state = STATE_NULL;
 312                                         }
 313                                 } break;
 314
 315                         /* -------------------------------------------------------------- */
 316                         /* Numerics ------------------------------------------------------*/
 317                         /* Simple integer */
 318                                 case NUMERAL_START : {
 319                                         if (isdigit(sc.ch)) {
 320                                                 radix_digits *= 10;
 321                                                 radix_digits += sc.ch - '0'; // Assuming ASCII here!
 322                                         } else if ('#' == sc.ch) {
 323                                                 if (2 > radix_digits || 36 < radix_digits) {
 324                                                         sc.SetState(SCE_ERLANG_DEFAULT);
 325                                                         parse_state = STATE_NULL;
 326                                                 } else {
 327                                                         parse_state = NUMERAL_BASE_VALUE;
 328                                                 }
 329                                         } else if ('.' == sc.ch && isdigit(sc.chNext)) {
 330                                                 radix_digits = 0;
 331                                                 parse_state = NUMERAL_FLOAT;
 332                                         } else if ('e' == sc.ch || 'E' == sc.ch) {
 333                                                 exponent_digits = 0;
 334                                                 parse_state = NUMERAL_EXPONENT;
 335                                         } else {
 336                                                 radix_digits = 0;
 337                                                 sc.ChangeState(SCE_ERLANG_NUMBER);
 338                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 339                                                 parse_state = STATE_NULL;
 340                                         }
 341                                 } break;
 342
 343                         /* Integer in other base than 10 (x#yyy) */
 344                                 case NUMERAL_BASE_VALUE : {
 345                                         if (!is_radix(radix_digits,sc.ch)) {
 346                                                 radix_digits = 0;
 347
 348                                                 if (!isalnum(sc.ch))
 349                                                         sc.ChangeState(SCE_ERLANG_NUMBER);
 350
 351                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 352                                                 parse_state = STATE_NULL;
 353                                         }
 354                                 } break;
 355
 356                         /* Float (x.yyy) */
 357                                 case NUMERAL_FLOAT : {
 358                                         if ('e' == sc.ch || 'E' == sc.ch) {
 359                                                 exponent_digits = 0;
 360                                                 parse_state = NUMERAL_EXPONENT;
 361                                         } else if (!isdigit(sc.ch)) {
 362                                                 sc.ChangeState(SCE_ERLANG_NUMBER);
 363                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 364                                                 parse_state = STATE_NULL;
 365                                         }
 366                                 } break;
 367
 368                         /* Exponent, either integer or float (xEyy, x.yyEzzz) */
 369                                 case NUMERAL_EXPONENT : {
 370                                         if (('-' == sc.ch || '+' == sc.ch)
 371                                                         && (isdigit(sc.chNext))) {
 372                                                 sc.Forward();
 373                                         } else if (!isdigit(sc.ch)) {
 374                                                 if (0 < exponent_digits)
 375                                                         sc.ChangeState(SCE_ERLANG_NUMBER);
 376                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 377                                                 parse_state = STATE_NULL;
 378                                         } else {
 379                                                 ++exponent_digits;
 380                                         }
 381                                 } break;
 382
 383                         /* -------------------------------------------------------------- */
 384                         /* Preprocessor --------------------------------------------------*/
 385                                 case PREPROCESSOR : {
 386                                         if (!IsAWordChar(sc.ch)) {
 387
 388                                                 sc.GetCurrent(cur, sizeof(cur));
 389                                                 if (erlangPreproc.InList(cur)) {
 390                                                         style = SCE_ERLANG_PREPROC;
 391                                                 } else if (erlangModulesAtt.InList(cur)) {
 392                                                         style = SCE_ERLANG_MODULES_ATT;
 393                                                 }
 394
 395                                                 sc.ChangeState(style);
 396                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 397                                                 parse_state = STATE_NULL;
 398                                         }
 399                                 } break;
 400
 401                         }
 402
 403                 } /* End of : STATE_NULL != parse_state */
 404                 else
 405                 {
 406                         switch (sc.state) {
 407                                 case SCE_ERLANG_VARIABLE : {
 408                                         if (!IsAWordChar(sc.ch))
 409                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 410                                 } break;
 411                                 case SCE_ERLANG_STRING : {
 412                                          if (sc.ch == '\"' && sc.chPrev != '\\')
 413                                                 sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 414                                 } break;
 415                                 case SCE_ERLANG_COMMENT : {
 416                                          if (sc.atLineEnd)
 417                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 418                                 } break;
 419                                 case SCE_ERLANG_CHARACTER : {
 420                                         if (sc.chPrev == '\\') {
 421                                                 sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 422                                         } else if (sc.ch != '\\') {
 423                                                 sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 424                                         }
 425                                 } break;
 426                                 case SCE_ERLANG_OPERATOR : {
 427                                         if (sc.chPrev == '.') {
 428                                                 if (sc.ch == '*' || sc.ch == '/' || sc.ch == '\\'
 429                                                         || sc.ch == '^') {
 430                                                         sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 431                                                 } else if (sc.ch == '\'') {
 432                                                         sc.ForwardSetState(SCE_ERLANG_DEFAULT);
 433                                                 } else {
 434                                                         sc.SetState(SCE_ERLANG_DEFAULT);
 435                                                 }
 436                                         } else {
 437                                                 sc.SetState(SCE_ERLANG_DEFAULT);
 438                                         }
 439                                 } break;
 440                         }
 441                 }
 442
 443                 if (sc.state == SCE_ERLANG_DEFAULT) {
 444                         bool no_new_state = false;
 445
 446                         switch (sc.ch) {
 447                                 case '\"' : sc.SetState(SCE_ERLANG_STRING); break;
 448                                 case '$' : sc.SetState(SCE_ERLANG_CHARACTER); break;
 449                                 case '%' : {
 450                                         parse_state = COMMENT;
 451                                         sc.SetState(SCE_ERLANG_COMMENT);
 452                                 } break;
 453                                 case '#' : {
 454                                         parse_state = RECORD_START;
 455                                         sc.SetState(SCE_ERLANG_UNKNOWN);
 456                                 } break;
 457                                 case '?' : {
 458                                         parse_state = MACRO_START;
 459                                         sc.SetState(SCE_ERLANG_UNKNOWN);
 460                                 } break;
 461                                 case '\'' : {
 462                                         parse_state = ATOM_QUOTED;
 463                                         sc.SetState(SCE_ERLANG_UNKNOWN);
 464                                 } break;
 465                                 case '+' :
 466                                 case '-' : {
 467                                         if (IsADigit(sc.chNext)) {
 468                                                 parse_state = NUMERAL_START;
 469                                                 radix_digits = 0;
 470                                                 sc.SetState(SCE_ERLANG_UNKNOWN);
 471                                         } else if (sc.ch != '+') {
 472                                                 parse_state = PREPROCESSOR;
 473                                                 sc.SetState(SCE_ERLANG_UNKNOWN);
 474                                         }
 475                                 } break;
 476                                 default : no_new_state = true;
 477                         }
 478
 479                         if (no_new_state) {
 480                                 if (isdigit(sc.ch)) {
 481                                         parse_state = NUMERAL_START;
 482                                         radix_digits = sc.ch - '0';
 483                                         sc.SetState(SCE_ERLANG_UNKNOWN);
 484                                 } else if (isupper(sc.ch) || '_' == sc.ch) {
 485                                         sc.SetState(SCE_ERLANG_VARIABLE);
 486                                 } else if (isalpha(sc.ch)) {
 487                                         parse_state = ATOM_UNQUOTED;
 488                                         sc.SetState(SCE_ERLANG_UNKNOWN);
 489                                 } else if (isoperator(static_cast<char>(sc.ch))
 490                                                         || sc.ch == '\\') {
 491                                         sc.SetState(SCE_ERLANG_OPERATOR);
 492                                 }
 493                         }
 494                 }
 495
 496         }
 497         sc.Complete();
 498 }
 499
 500 static int ClassifyErlangFoldPoint(
 501         Accessor &styler,
 502         int styleNext,
 503         int keyword_start
 504 ) {
 505         int lev = 0;
 506         if (styler.Match(keyword_start,"case")
 507                 || (
 508                         styler.Match(keyword_start,"fun")
 509                         && (SCE_ERLANG_FUNCTION_NAME != styleNext)
 510                         )
 511                 || styler.Match(keyword_start,"if")
 512                 || styler.Match(keyword_start,"query")
 513                 || styler.Match(keyword_start,"receive")
 514         ) {
 515                 ++lev;
 516         } else if (styler.Match(keyword_start,"end")) {
 517                 --lev;
 518         }
 519
 520         return lev;
 521 }
 522
 523 static void FoldErlangDoc(
 524         unsigned int startPos, int length, int initStyle,
 525         WordList** /*keywordlists*/, Accessor &styler
 526 ) {
 527         unsigned int endPos = startPos + length;
 528         int currentLine = styler.GetLine(startPos);
 529         int lev;
 530         int previousLevel = styler.LevelAt(currentLine) & SC_FOLDLEVELNUMBERMASK;
 531         int currentLevel = previousLevel;
 532         int styleNext = styler.StyleAt(startPos);
 533         int style = initStyle;
 534         int stylePrev;
 535         int keyword_start = 0;
 536         char ch;
 537         char chNext = styler.SafeGetCharAt(startPos);
 538         bool atEOL;
 539
 540         for (unsigned int i = startPos; i < endPos; i++) {
 541                 ch = chNext;
 542                 chNext = styler.SafeGetCharAt(i + 1);
 543
 544                 // Get styles
 545                 stylePrev = style;
 546                 style = styleNext;
 547                 styleNext = styler.StyleAt(i + 1);
 548                 atEOL = ((ch == '\r') && (chNext != '\n')) || (ch == '\n');
 549
 550                 if (stylePrev != SCE_ERLANG_KEYWORD
 551                         && style == SCE_ERLANG_KEYWORD) {
 552                         keyword_start = i;
 553                 }
 554
 555                 // Fold on keywords
 556                 if (stylePrev == SCE_ERLANG_KEYWORD
 557                         && style != SCE_ERLANG_KEYWORD
 558                         && style != SCE_ERLANG_ATOM
 559                 ) {
 560                         currentLevel += ClassifyErlangFoldPoint(styler,
 561                                                                                                         styleNext,
 562                                                                                                         keyword_start);
 563                 }
 564
 565                 // Fold on comments
 566                 if (style == SCE_ERLANG_COMMENT
 567                         || style == SCE_ERLANG_COMMENT_MODULE
 568                         || style == SCE_ERLANG_COMMENT_FUNCTION) {
 569
 570                         if (ch == '%' && chNext == '{') {
 571                                 currentLevel++;
 572                         } else if (ch == '%' && chNext == '}') {
 573                                 currentLevel--;
 574                         }
 575                 }
 576
 577                 // Fold on braces
 578                 if (style == SCE_ERLANG_OPERATOR) {
 579                         if (ch == '{' || ch == '(' || ch == '[') {
 580                                 currentLevel++;
 581                         } else if (ch == '}' || ch == ')' || ch == ']') {
 582                                 currentLevel--;
 583                         }
 584                 }
 585
 586
 587                 if (atEOL) {
 588                         lev = previousLevel;
 589
 590                         if (currentLevel > previousLevel)
 591                                 lev |= SC_FOLDLEVELHEADERFLAG;
 592
 593                         if (lev != styler.LevelAt(currentLine))
 594                                 styler.SetLevel(currentLine, lev);
 595
 596                         currentLine++;
 597                         previousLevel = currentLevel;
 598                 }
 599
 600         }
 601
 602         // Fill in the real level of the next line, keeping the current flags as they will be filled in later
 603         styler.SetLevel(currentLine,
 604                                         previousLevel
 605                                         | (styler.LevelAt(currentLine) & ~SC_FOLDLEVELNUMBERMASK));
 606 }
 607
 608 static const char * const erlangWordListDesc[] = {
 609         "Erlang Reserved words",
 610         "Erlang BIFs",
 611         "Erlang Preprocessor",
 612         "Erlang Module Attributes",
 613         "Erlang Documentation",
 614         "Erlang Documentation Macro",
 615         0
 616 };
 617
 618 LexerModule lmErlang(
 619         SCLEX_ERLANG,
 620         ColouriseErlangDoc,
 621         "erlang",
 622         FoldErlangDoc,
 623         erlangWordListDesc);