scintilla/LexBash.cxx

   1 // Scintilla source code edit control
   2 /** @file LexBash.cxx
   3  ** Lexer for Bash.
   4  **/
   5 // Copyright 2004 by Neil Hodgson <neilh@scintilla.org>
   6 // Adapted from LexPerl by Kein-Hong Man <mkh@pl.jaring.my> 2004
   7 // The License.txt file describes the conditions under which this software may be distributed.
   8
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <ctype.h>
  12 #include <stdio.h>
  13 #include <stdarg.h>
  14
  15 #include "Platform.h"
  16
  17 #include "PropSet.h"
  18 #include "Accessor.h"
  19 #include "KeyWords.h"
  20 #include "Scintilla.h"
  21 #include "SciLexer.h"
  22
  23 #define BASH_BASE_ERROR         65
  24 #define BASH_BASE_DECIMAL       66
  25 #define BASH_BASE_HEX           67
  26 #define BASH_BASE_OCTAL         68
  27 #define BASH_BASE_OCTAL_ERROR   69
  28
  29 #define HERE_DELIM_MAX 256
  30
  31 static inline int translateBashDigit(char ch) {
  32         if (ch >= '0' && ch <= '9') {
  33                 return ch - '0';
  34         } else if (ch >= 'a' && ch <= 'z') {
  35                 return ch - 'a' + 10;
  36         } else if (ch >= 'A' && ch <= 'Z') {
  37                 return ch - 'A' + 36;
  38         } else if (ch == '@') {
  39                 return 62;
  40         } else if (ch == '_') {
  41                 return 63;
  42         }
  43         return BASH_BASE_ERROR;
  44 }
  45
  46 static inline bool isEOLChar(char ch) {
  47         return (ch == '\r') || (ch == '\n');
  48 }
  49
  50 static bool isSingleCharOp(char ch) {
  51         char strCharSet[2];
  52         strCharSet[0] = ch;
  53         strCharSet[1] = '\0';
  54         return (NULL != strstr("rwxoRWXOezsfdlpSbctugkTBMACahGLNn", strCharSet));
  55 }
  56
  57 static inline bool isBashOperator(char ch) {
  58         if (ch == '^' || ch == '&' || ch == '\\' || ch == '%' ||
  59                 ch == '(' || ch == ')' || ch == '-' || ch == '+' ||
  60                 ch == '=' || ch == '|' || ch == '{' || ch == '}' ||
  61                 ch == '[' || ch == ']' || ch == ':' || ch == ';' ||
  62                 ch == '>' || ch == ',' || ch == '/' || ch == '<' ||
  63                 ch == '?' || ch == '!' || ch == '.' || ch == '~' ||
  64                 ch == '@')
  65                 return true;
  66         return false;
  67 }
  68
  69 static int classifyWordBash(unsigned int start, unsigned int end, WordList &keywords, Accessor &styler) {
  70         char s[100];
  71         for (unsigned int i = 0; i < end - start + 1 && i < 30; i++) {
  72                 s[i] = styler[start + i];
  73                 s[i + 1] = '\0';
  74         }
  75         char chAttr = SCE_SH_IDENTIFIER;
  76         if (keywords.InList(s))
  77                 chAttr = SCE_SH_WORD;
  78         styler.ColourTo(end, chAttr);
  79         return chAttr;
  80 }
  81
  82 static inline int getBashNumberBase(unsigned int start, unsigned int end, Accessor &styler) {
  83         int base = 0;
  84         for (unsigned int i = 0; i < end - start + 1 && i < 10; i++) {
  85                 base = base * 10 + (styler[start + i] - '0');
  86         }
  87         if (base > 64 || (end - start) > 1) {
  88                 return BASH_BASE_ERROR;
  89         }
  90         return base;
  91 }
  92
  93 static inline bool isEndVar(char ch) {
  94         return !isalnum(ch) && ch != '$' && ch != '_';
  95 }
  96
  97 static inline bool isNonQuote(char ch) {
  98         return isalnum(ch) || ch == '_';
  99 }
 100
 101 static bool isMatch(Accessor &styler, int lengthDoc, int pos, const char *val) {
 102         if ((pos + static_cast<int>(strlen(val))) >= lengthDoc) {
 103                 return false;
 104         }
 105         while (*val) {
 106                 if (*val != styler[pos++]) {
 107                         return false;
 108                 }
 109                 val++;
 110         }
 111         return true;
 112 }
 113
 114 static char opposite(char ch) {
 115         if (ch == '(')
 116                 return ')';
 117         if (ch == '[')
 118                 return ']';
 119         if (ch == '{')
 120                 return '}';
 121         if (ch == '<')
 122                 return '>';
 123         return ch;
 124 }
 125
 126 static void ColouriseBashDoc(unsigned int startPos, int length, int initStyle,
 127                              WordList *keywordlists[], Accessor &styler) {
 128
 129         // Lexer for bash often has to backtrack to start of current style to determine
 130         // which characters are being used as quotes, how deeply nested is the
 131         // start position and what the termination string is for here documents
 132
 133         WordList &keywords = *keywordlists[0];
 134
 135         class HereDocCls {
 136         public:
 137                 int State;              // 0: '<<' encountered
 138                 // 1: collect the delimiter
 139                 // 2: here doc text (lines after the delimiter)
 140                 char Quote;             // the char after '<<'
 141                 bool Quoted;            // true if Quote in ('\'','"','`')
 142                 bool Indent;            // indented delimiter (for <<-)
 143                 int DelimiterLength;    // strlen(Delimiter)
 144                 char *Delimiter;        // the Delimiter, 256: sizeof PL_tokenbuf
 145                 HereDocCls() {
 146                         State = 0;
 147                         DelimiterLength = 0;
 148                         Delimiter = new char[HERE_DELIM_MAX];
 149                         Delimiter[0] = '\0';
 150                 }
 151                 ~HereDocCls() {
 152                         delete []Delimiter;
 153                 }
 154         };
 155         HereDocCls HereDoc;
 156
 157         class QuoteCls {
 158                 public:
 159                 int  Rep;
 160                 int  Count;
 161                 char Up;
 162                 char Down;
 163                 QuoteCls() {
 164                         this->New(1);
 165                 }
 166                 void New(int r) {
 167                         Rep   = r;
 168                         Count = 0;
 169                         Up    = '\0';
 170                         Down  = '\0';
 171                 }
 172                 void Open(char u) {
 173                         Count++;
 174                         Up    = u;
 175                         Down  = opposite(Up);
 176                 }
 177         };
 178         QuoteCls Quote;
 179
 180         int state = initStyle;
 181         int numBase = 0;
 182         unsigned int lengthDoc = startPos + length;
 183
 184         // If in a long distance lexical state, seek to the beginning to find quote characters
 185         // Bash strings can be multi-line with embedded newlines, so backtrack.
 186         // Bash numbers have additional state during lexing, so backtrack too.
 187         if (state == SCE_SH_HERE_Q) {
 188                 while ((startPos > 1) && (styler.StyleAt(startPos) != SCE_SH_HERE_DELIM)) {
 189                         startPos--;
 190                 }
 191                 startPos = styler.LineStart(styler.GetLine(startPos));
 192                 state = styler.StyleAt(startPos - 1);
 193         }
 194         if (state == SCE_SH_STRING
 195          || state == SCE_SH_BACKTICKS
 196          || state == SCE_SH_CHARACTER
 197          || state == SCE_SH_NUMBER
 198          || state == SCE_SH_IDENTIFIER
 199          || state == SCE_SH_COMMENTLINE
 200         ) {
 201                 while ((startPos > 1) && (styler.StyleAt(startPos - 1) == state)) {
 202                         startPos--;
 203                 }
 204                 state = SCE_SH_DEFAULT;
 205         }
 206
 207         styler.StartAt(startPos);
 208         char chPrev = styler.SafeGetCharAt(startPos - 1);
 209         if (startPos == 0)
 210                 chPrev = '\n';
 211         char chNext = styler[startPos];
 212         styler.StartSegment(startPos);
 213
 214         for (unsigned int i = startPos; i < lengthDoc; i++) {
 215                 char ch = chNext;
 216                 // if the current character is not consumed due to the completion of an
 217                 // earlier style, lexing can be restarted via a simple goto
 218         restartLexer:
 219                 chNext = styler.SafeGetCharAt(i + 1);
 220                 char chNext2 = styler.SafeGetCharAt(i + 2);
 221
 222                 if (styler.IsLeadByte(ch)) {
 223                         chNext = styler.SafeGetCharAt(i + 2);
 224                         chPrev = ' ';
 225                         i += 1;
 226                         continue;
 227                 }
 228
 229                 if ((chPrev == '\r' && ch == '\n')) {   // skip on DOS/Windows
 230                         styler.ColourTo(i, state);
 231                         chPrev = ch;
 232                         continue;
 233                 }
 234
 235                 if (HereDoc.State == 1 && isEOLChar(ch)) {
 236                         // Begin of here-doc (the line after the here-doc delimiter):
 237                         // Lexically, the here-doc starts from the next line after the >>, but the
 238                         // first line of here-doc seem to follow the style of the last EOL sequence
 239                         HereDoc.State = 2;
 240                         if (HereDoc.Quoted) {
 241                                 if (state == SCE_SH_HERE_DELIM) {
 242                                         // Missing quote at end of string! We are stricter than bash.
 243                                         // Colour here-doc anyway while marking this bit as an error.
 244                                         state = SCE_SH_ERROR;
 245                                 }
 246                                 styler.ColourTo(i - 1, state);
 247                                 // HereDoc.Quote always == '\''
 248                                 state = SCE_SH_HERE_Q;
 249                         } else {
 250                                 styler.ColourTo(i - 1, state);
 251                                 // always switch
 252                                 state = SCE_SH_HERE_Q;
 253                         }
 254                 }
 255
 256                 if (state == SCE_SH_DEFAULT) {
 257                         if (ch == '\\') {       // escaped character
 258                                 i++;
 259                                 ch = chNext;
 260                                 chNext = chNext2;
 261                                 styler.ColourTo(i, SCE_SH_IDENTIFIER);
 262                         } else if (isdigit(ch)) {
 263                                 state = SCE_SH_NUMBER;
 264                                 numBase = BASH_BASE_DECIMAL;
 265                                 if (ch == '0') {        // hex,octal
 266                                         if (chNext == 'x' || chNext == 'X') {
 267                                                 numBase = BASH_BASE_HEX;
 268                                                 i++;
 269                                                 ch = chNext;
 270                                                 chNext = chNext2;
 271                                         } else if (isdigit(chNext)) {
 272                                                 numBase = BASH_BASE_OCTAL;
 273                                         }
 274                                 }
 275                         } else if (iswordstart(ch)) {
 276                                 state = SCE_SH_WORD;
 277                                 if (!iswordchar(chNext) && chNext != '+' && chNext != '-') {
 278                                         // We need that if length of word == 1!
 279                                         // This test is copied from the SCE_SH_WORD handler.
 280                                         classifyWordBash(styler.GetStartSegment(), i, keywords, styler);
 281                                         state = SCE_SH_DEFAULT;
 282                                 }
 283                         } else if (ch == '#') {
 284                                 state = SCE_SH_COMMENTLINE;
 285                         } else if (ch == '\"') {
 286                                 state = SCE_SH_STRING;
 287                                 Quote.New(1);
 288                                 Quote.Open(ch);
 289                         } else if (ch == '\'') {
 290                                 state = SCE_SH_CHARACTER;
 291                                 Quote.New(1);
 292                                 Quote.Open(ch);
 293                         } else if (ch == '`') {
 294                                 state = SCE_SH_BACKTICKS;
 295                                 Quote.New(1);
 296                                 Quote.Open(ch);
 297                         } else if (ch == '$') {
 298                                 if (chNext == '{') {
 299                                         state = SCE_SH_PARAM;
 300                                         goto startQuote;
 301                                 } else if (chNext == '\'') {
 302                                         state = SCE_SH_CHARACTER;
 303                                         goto startQuote;
 304                                 } else if (chNext == '"') {
 305                                         state = SCE_SH_STRING;
 306                                         goto startQuote;
 307                                 } else if (chNext == '(' && chNext2 == '(') {
 308                                         styler.ColourTo(i, SCE_SH_OPERATOR);
 309                                         state = SCE_SH_DEFAULT;
 310                                         goto skipChar;
 311                                 } else if (chNext == '(' || chNext == '`') {
 312                                         state = SCE_SH_BACKTICKS;
 313                                 startQuote:
 314                                         Quote.New(1);
 315                                         Quote.Open(chNext);
 316                                         goto skipChar;
 317                                 } else {
 318                                         state = SCE_SH_SCALAR;
 319                                 skipChar:
 320                                         i++;
 321                                         ch = chNext;
 322                                         chNext = chNext2;
 323                                 }
 324                         } else if (ch == '*') {
 325                                 if (chNext == '*') {    // exponentiation
 326                                         i++;
 327                                         ch = chNext;
 328                                         chNext = chNext2;
 329                                 }
 330                                 styler.ColourTo(i, SCE_SH_OPERATOR);
 331                         } else if (ch == '<' && chNext == '<') {
 332                                 state = SCE_SH_HERE_DELIM;
 333                                 HereDoc.State = 0;
 334                                 HereDoc.Indent = false;
 335                         } else if (ch == '-'    // file test operators
 336                                    && isSingleCharOp(chNext)
 337                                    && !isalnum((chNext2 = styler.SafeGetCharAt(i+2)))) {
 338                                 styler.ColourTo(i + 1, SCE_SH_WORD);
 339                                 state = SCE_SH_DEFAULT;
 340                                 i++;
 341                                 ch = chNext;
 342                                 chNext = chNext2;
 343                         } else if (isBashOperator(ch)) {
 344                                 styler.ColourTo(i, SCE_SH_OPERATOR);
 345                         } else {
 346                                 // keep colouring defaults to make restart easier
 347                                 styler.ColourTo(i, SCE_SH_DEFAULT);
 348                         }
 349                 } else if (state == SCE_SH_NUMBER) {
 350                         int digit = translateBashDigit(ch);
 351                         if (numBase == BASH_BASE_DECIMAL) {
 352                                 if (ch == '#') {
 353                                         numBase = getBashNumberBase(styler.GetStartSegment(), i - 1, styler);
 354                                         if (numBase == BASH_BASE_ERROR) // take the rest as comment
 355                                                 goto numAtEnd;
 356                                 } else if (!isdigit(ch))
 357                                         goto numAtEnd;
 358                         } else if (numBase == BASH_BASE_HEX) {
 359                                 if ((digit < 16) || (digit >= 36 && digit <= 41)) {
 360                                         // hex digit 0-9a-fA-F
 361                                 } else
 362                                         goto numAtEnd;
 363                         } else if (numBase == BASH_BASE_OCTAL ||
 364                                    numBase == BASH_BASE_OCTAL_ERROR) {
 365                                 if (digit > 7) {
 366                                         if (digit <= 9) {
 367                                                 numBase = BASH_BASE_OCTAL_ERROR;
 368                                         } else
 369                                                 goto numAtEnd;
 370                                 }
 371                         } else if (numBase == BASH_BASE_ERROR) {
 372                                 if (digit > 9)
 373                                         goto numAtEnd;
 374                         } else {        // DD#DDDD number style handling
 375                                 if (digit != BASH_BASE_ERROR) {
 376                                         if (numBase <= 36) {
 377                                                 // case-insensitive if base<=36
 378                                                 if (digit >= 36) digit -= 26;
 379                                         }
 380                                         if (digit >= numBase) {
 381                                                 if (digit <= 9) {
 382                                                         numBase = BASH_BASE_ERROR;
 383                                                 } else
 384                                                         goto numAtEnd;
 385                                         }
 386                                 } else {
 387                         numAtEnd:
 388                                         if (numBase == BASH_BASE_ERROR ||
 389                                             numBase == BASH_BASE_OCTAL_ERROR)
 390                                                 state = SCE_SH_ERROR;
 391                                         styler.ColourTo(i - 1, state);
 392                                         state = SCE_SH_DEFAULT;
 393                                         goto restartLexer;
 394                                 }
 395                         }
 396                 } else if (state == SCE_SH_WORD) {
 397                         if (!iswordchar(chNext) && chNext != '+' && chNext != '-') {
 398                                 // "." never used in Bash variable names
 399                                 // but used in file names
 400                                 classifyWordBash(styler.GetStartSegment(), i, keywords, styler);
 401                                 state = SCE_SH_DEFAULT;
 402                                 ch = ' ';
 403                         }
 404                 } else if (state == SCE_SH_IDENTIFIER) {
 405                         if (!iswordchar(chNext) && chNext != '+' && chNext != '-') {
 406                                 styler.ColourTo(i, SCE_SH_IDENTIFIER);
 407                                 state = SCE_SH_DEFAULT;
 408                                 ch = ' ';
 409                         }
 410                 } else {
 411                         if (state == SCE_SH_COMMENTLINE) {
 412                                 if (ch == '\\' && isEOLChar(chNext)) {
 413                                         // comment continuation
 414                                         if (chNext == '\r' && chNext2 == '\n') {
 415                                                 i += 2;
 416                                                 ch = styler.SafeGetCharAt(i);
 417                                                 chNext = styler.SafeGetCharAt(i + 1);
 418                                         } else {
 419                                                 i++;
 420                                                 ch = chNext;
 421                                                 chNext = chNext2;
 422                                         }
 423                                 } else if (isEOLChar(ch)) {
 424                                         styler.ColourTo(i - 1, state);
 425                                         state = SCE_SH_DEFAULT;
 426                                         goto restartLexer;
 427                                 } else if (isEOLChar(chNext)) {
 428                                         styler.ColourTo(i, state);
 429                                         state = SCE_SH_DEFAULT;
 430                                 }
 431                         } else if (state == SCE_SH_HERE_DELIM) {
 432                                 //
 433                                 // From Bash info:
 434                                 // ---------------
 435                                 // Specifier format is: <<[-]WORD
 436                                 // Optional '-' is for removal of leading tabs from here-doc.
 437                                 // Whitespace acceptable after <<[-] operator
 438                                 //
 439                                 if (HereDoc.State == 0) { // '<<' encountered
 440                                         HereDoc.State = 1;
 441                                         HereDoc.Quote = chNext;
 442                                         HereDoc.Quoted = false;
 443                                         HereDoc.DelimiterLength = 0;
 444                                         HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
 445                                         if (chNext == '\'') {   // a quoted here-doc delimiter (' only)
 446                                                 i++;
 447                                                 ch = chNext;
 448                                                 chNext = chNext2;
 449                                                 HereDoc.Quoted = true;
 450                                         } else if (!HereDoc.Indent && chNext == '-') {  // <<- indent case
 451                                                 HereDoc.Indent = true;
 452                                                 HereDoc.State = 0;
 453                                         } else if (isalpha(chNext) || chNext == '_' || chNext == '\\'
 454                                                 || chNext == '-' || chNext == '+') {
 455                                                 // an unquoted here-doc delimiter, no special handling
 456                                         } else if (chNext == '<') {     // HERE string <<<
 457                                                 i++;
 458                                                 ch = chNext;
 459                                                 chNext = chNext2;
 460                                                 styler.ColourTo(i, SCE_SH_HERE_DELIM);
 461                                                 state = SCE_SH_DEFAULT;
 462                                                 HereDoc.State = 0;
 463                                         } else if (isspacechar(chNext)) {
 464                                                 // eat whitespace
 465                                                 HereDoc.State = 0;
 466                                         } else if (isdigit(chNext) || chNext == '=' || chNext == '$') {
 467                                                 // left shift << or <<= operator cases
 468                                                 styler.ColourTo(i, SCE_SH_OPERATOR);
 469                                                 state = SCE_SH_DEFAULT;
 470                                                 HereDoc.State = 0;
 471                                         } else {
 472                                                 // symbols terminates; deprecated zero-length delimiter
 473                                         }
 474                                 } else if (HereDoc.State == 1) { // collect the delimiter
 475                                         if (HereDoc.Quoted) { // a quoted here-doc delimiter
 476                                                 if (ch == HereDoc.Quote) { // closing quote => end of delimiter
 477                                                         styler.ColourTo(i, state);
 478                                                         state = SCE_SH_DEFAULT;
 479                                                 } else {
 480                                                         if (ch == '\\' && chNext == HereDoc.Quote) { // escaped quote
 481                                                                 i++;
 482                                                                 ch = chNext;
 483                                                                 chNext = chNext2;
 484                                                         }
 485                                                         HereDoc.Delimiter[HereDoc.DelimiterLength++] = ch;
 486                                                         HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
 487                                                 }
 488                                         } else { // an unquoted here-doc delimiter
 489                                                 if (isalnum(ch) || ch == '_' || ch == '-' || ch == '+') {
 490                                                         HereDoc.Delimiter[HereDoc.DelimiterLength++] = ch;
 491                                                         HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
 492                                                 } else if (ch == '\\') {
 493                                                         // skip escape prefix
 494                                                 } else {
 495                                                         styler.ColourTo(i - 1, state);
 496                                                         state = SCE_SH_DEFAULT;
 497                                                         goto restartLexer;
 498                                                 }
 499                                         }
 500                                         if (HereDoc.DelimiterLength >= HERE_DELIM_MAX - 1) {
 501                                                 styler.ColourTo(i - 1, state);
 502                                                 state = SCE_SH_ERROR;
 503                                                 goto restartLexer;
 504                                         }
 505                                 }
 506                         } else if (HereDoc.State == 2) {
 507                                 // state == SCE_SH_HERE_Q
 508                                 if (isMatch(styler, lengthDoc, i, HereDoc.Delimiter)) {
 509                                         if (!HereDoc.Indent && isEOLChar(chPrev)) {
 510                                         endHereDoc:
 511                                                 // standard HERE delimiter
 512                                                 i += HereDoc.DelimiterLength;
 513                                                 chPrev = styler.SafeGetCharAt(i - 1);
 514                                                 ch = styler.SafeGetCharAt(i);
 515                                                 if (isEOLChar(ch)) {
 516                                                         styler.ColourTo(i - 1, state);
 517                                                         state = SCE_SH_DEFAULT;
 518                                                         HereDoc.State = 0;
 519                                                         goto restartLexer;
 520                                                 }
 521                                                 chNext = styler.SafeGetCharAt(i + 1);
 522                                         } else if (HereDoc.Indent) {
 523                                                 // indented HERE delimiter
 524                                                 unsigned int bk = (i > 0)? i - 1: 0;
 525                                                 while (i > 0) {
 526                                                         ch = styler.SafeGetCharAt(bk--);
 527                                                         if (isEOLChar(ch)) {
 528                                                                 goto endHereDoc;
 529                                                         } else if (!isspacechar(ch)) {
 530                                                                 break;  // got leading non-whitespace
 531                                                         }
 532                                                 }
 533                                         }
 534                                 }
 535                         } else if (state == SCE_SH_SCALAR) {    // variable names
 536                                 if (isEndVar(ch)) {
 537                                         if ((state == SCE_SH_SCALAR)
 538                                             && i == (styler.GetStartSegment() + 1)) {
 539                                                 // Special variable: $(, $_ etc.
 540                                                 styler.ColourTo(i, state);
 541                                                 state = SCE_SH_DEFAULT;
 542                                         } else {
 543                                                 styler.ColourTo(i - 1, state);
 544                                                 state = SCE_SH_DEFAULT;
 545                                                 goto restartLexer;
 546                                         }
 547                                 }
 548                         } else if (state == SCE_SH_STRING
 549                                 || state == SCE_SH_CHARACTER
 550                                 || state == SCE_SH_BACKTICKS
 551                                 || state == SCE_SH_PARAM
 552                                 ) {
 553                                 if (!Quote.Down && !isspacechar(ch)) {
 554                                         Quote.Open(ch);
 555                                 } else if (ch == '\\' && Quote.Up != '\\') {
 556                                         i++;
 557                                         ch = chNext;
 558                                         chNext = styler.SafeGetCharAt(i + 1);
 559                                 } else if (ch == Quote.Down) {
 560                                         Quote.Count--;
 561                                         if (Quote.Count == 0) {
 562                                                 Quote.Rep--;
 563                                                 if (Quote.Rep <= 0) {
 564                                                         styler.ColourTo(i, state);
 565                                                         state = SCE_SH_DEFAULT;
 566                                                         ch = ' ';
 567                                                 }
 568                                                 if (Quote.Up == Quote.Down) {
 569                                                         Quote.Count++;
 570                                                 }
 571                                         }
 572                                 } else if (ch == Quote.Up) {
 573                                         Quote.Count++;
 574                                 }
 575                         }
 576                 }
 577                 if (state == SCE_SH_ERROR) {
 578                         break;
 579                 }
 580                 chPrev = ch;
 581         }
 582         styler.ColourTo(lengthDoc - 1, state);
 583 }
 584
 585 static void FoldBashDoc(unsigned int startPos, int length, int, WordList *[],
 586                             Accessor &styler) {
 587         bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
 588         bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
 589         unsigned int endPos = startPos + length;
 590         int visibleChars = 0;
 591         int lineCurrent = styler.GetLine(startPos);
 592         int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 593         int levelCurrent = levelPrev;
 594         char chNext = styler[startPos];
 595         int styleNext = styler.StyleAt(startPos);
 596         for (unsigned int i = startPos; i < endPos; i++) {
 597                 char ch = chNext;
 598                 chNext = styler.SafeGetCharAt(i + 1);
 599                 int style = styleNext;
 600                 styleNext = styler.StyleAt(i + 1);
 601                 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 602                 if (foldComment && (style == SCE_SH_COMMENTLINE)) {
 603                         if ((ch == '/') && (chNext == '/')) {
 604                                 char chNext2 = styler.SafeGetCharAt(i + 2);
 605                                 if (chNext2 == '{') {
 606                                         levelCurrent++;
 607                                 } else if (chNext2 == '}') {
 608                                         levelCurrent--;
 609                                 }
 610                         }
 611                 }
 612                 if (style == SCE_C_OPERATOR) {
 613                         if (ch == '{') {
 614                                 levelCurrent++;
 615                         } else if (ch == '}') {
 616                                 levelCurrent--;
 617                         }
 618                 }
 619                 if (atEOL) {
 620                         int lev = levelPrev;
 621                         if (visibleChars == 0 && foldCompact)
 622                                 lev |= SC_FOLDLEVELWHITEFLAG;
 623                         if ((levelCurrent > levelPrev) && (visibleChars > 0))
 624                                 lev |= SC_FOLDLEVELHEADERFLAG;
 625                         if (lev != styler.LevelAt(lineCurrent)) {
 626                                 styler.SetLevel(lineCurrent, lev);
 627                         }
 628                         lineCurrent++;
 629                         levelPrev = levelCurrent;
 630                         visibleChars = 0;
 631                 }
 632                 if (!isspacechar(ch))
 633                         visibleChars++;
 634         }
 635         // Fill in the real level of the next line, keeping the current flags as they will be filled in later
 636         int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
 637         styler.SetLevel(lineCurrent, levelPrev | flagsNext);
 638 }
 639
 640 static const char * const bashWordListDesc[] = {
 641         "Keywords",
 642         0
 643 };
 644
 645 LexerModule lmBash(SCLEX_BASH, ColouriseBashDoc, "bash", FoldBashDoc, bashWordListDesc);