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[wxWidgets.git] / contrib / src / stc / scintilla / src / LexBash.cxx
1 // Scintilla source code edit control
2 /** @file LexBash.cxx
3 ** Lexer for Bash.
4 **/
5 // Copyright 2004-2005 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 Quote = 0;
148 Quoted = false;
149 Indent = 0;
150 DelimiterLength = 0;
151 Delimiter = new char[HERE_DELIM_MAX];
152 Delimiter[0] = '\0';
153 }
154 ~HereDocCls() {
155 delete []Delimiter;
156 }
157 };
158 HereDocCls HereDoc;
159
160 class QuoteCls {
161 public:
162 int Rep;
163 int Count;
164 char Up;
165 char Down;
166 QuoteCls() {
167 this->New(1);
168 }
169 void New(int r) {
170 Rep = r;
171 Count = 0;
172 Up = '\0';
173 Down = '\0';
174 }
175 void Open(char u) {
176 Count++;
177 Up = u;
178 Down = opposite(Up);
179 }
180 };
181 QuoteCls Quote;
182
183 int state = initStyle;
184 int numBase = 0;
185 unsigned int lengthDoc = startPos + length;
186
187 // If in a long distance lexical state, seek to the beginning to find quote characters
188 // Bash strings can be multi-line with embedded newlines, so backtrack.
189 // Bash numbers have additional state during lexing, so backtrack too.
190 if (state == SCE_SH_HERE_Q) {
191 while ((startPos > 1) && (styler.StyleAt(startPos) != SCE_SH_HERE_DELIM)) {
192 startPos--;
193 }
194 startPos = styler.LineStart(styler.GetLine(startPos));
195 state = styler.StyleAt(startPos - 1);
196 }
197 if (state == SCE_SH_STRING
198 || state == SCE_SH_BACKTICKS
199 || state == SCE_SH_CHARACTER
200 || state == SCE_SH_NUMBER
201 || state == SCE_SH_IDENTIFIER
202 || state == SCE_SH_COMMENTLINE
203 ) {
204 while ((startPos > 1) && (styler.StyleAt(startPos - 1) == state)) {
205 startPos--;
206 }
207 state = SCE_SH_DEFAULT;
208 }
209
210 styler.StartAt(startPos);
211 char chPrev = styler.SafeGetCharAt(startPos - 1);
212 if (startPos == 0)
213 chPrev = '\n';
214 char chNext = styler[startPos];
215 styler.StartSegment(startPos);
216
217 for (unsigned int i = startPos; i < lengthDoc; i++) {
218 char ch = chNext;
219 // if the current character is not consumed due to the completion of an
220 // earlier style, lexing can be restarted via a simple goto
221 restartLexer:
222 chNext = styler.SafeGetCharAt(i + 1);
223 char chNext2 = styler.SafeGetCharAt(i + 2);
224
225 if (styler.IsLeadByte(ch)) {
226 chNext = styler.SafeGetCharAt(i + 2);
227 chPrev = ' ';
228 i += 1;
229 continue;
230 }
231
232 if ((chPrev == '\r' && ch == '\n')) { // skip on DOS/Windows
233 styler.ColourTo(i, state);
234 chPrev = ch;
235 continue;
236 }
237
238 if (HereDoc.State == 1 && isEOLChar(ch)) {
239 // Begin of here-doc (the line after the here-doc delimiter):
240 // Lexically, the here-doc starts from the next line after the >>, but the
241 // first line of here-doc seem to follow the style of the last EOL sequence
242 HereDoc.State = 2;
243 if (HereDoc.Quoted) {
244 if (state == SCE_SH_HERE_DELIM) {
245 // Missing quote at end of string! We are stricter than bash.
246 // Colour here-doc anyway while marking this bit as an error.
247 state = SCE_SH_ERROR;
248 }
249 styler.ColourTo(i - 1, state);
250 // HereDoc.Quote always == '\''
251 state = SCE_SH_HERE_Q;
252 } else {
253 styler.ColourTo(i - 1, state);
254 // always switch
255 state = SCE_SH_HERE_Q;
256 }
257 }
258
259 if (state == SCE_SH_DEFAULT) {
260 if (ch == '\\') { // escaped character
261 i++;
262 ch = chNext;
263 chNext = chNext2;
264 styler.ColourTo(i, SCE_SH_IDENTIFIER);
265 } else if (isdigit(ch)) {
266 state = SCE_SH_NUMBER;
267 numBase = BASH_BASE_DECIMAL;
268 if (ch == '0') { // hex,octal
269 if (chNext == 'x' || chNext == 'X') {
270 numBase = BASH_BASE_HEX;
271 i++;
272 ch = chNext;
273 chNext = chNext2;
274 } else if (isdigit(chNext)) {
275 numBase = BASH_BASE_OCTAL;
276 }
277 }
278 } else if (iswordstart(ch)) {
279 state = SCE_SH_WORD;
280 if (!iswordchar(chNext) && chNext != '+' && chNext != '-') {
281 // We need that if length of word == 1!
282 // This test is copied from the SCE_SH_WORD handler.
283 classifyWordBash(styler.GetStartSegment(), i, keywords, styler);
284 state = SCE_SH_DEFAULT;
285 }
286 } else if (ch == '#') {
287 state = SCE_SH_COMMENTLINE;
288 } else if (ch == '\"') {
289 state = SCE_SH_STRING;
290 Quote.New(1);
291 Quote.Open(ch);
292 } else if (ch == '\'') {
293 state = SCE_SH_CHARACTER;
294 Quote.New(1);
295 Quote.Open(ch);
296 } else if (ch == '`') {
297 state = SCE_SH_BACKTICKS;
298 Quote.New(1);
299 Quote.Open(ch);
300 } else if (ch == '$') {
301 if (chNext == '{') {
302 state = SCE_SH_PARAM;
303 goto startQuote;
304 } else if (chNext == '\'') {
305 state = SCE_SH_CHARACTER;
306 goto startQuote;
307 } else if (chNext == '"') {
308 state = SCE_SH_STRING;
309 goto startQuote;
310 } else if (chNext == '(' && chNext2 == '(') {
311 styler.ColourTo(i, SCE_SH_OPERATOR);
312 state = SCE_SH_DEFAULT;
313 goto skipChar;
314 } else if (chNext == '(' || chNext == '`') {
315 state = SCE_SH_BACKTICKS;
316 startQuote:
317 Quote.New(1);
318 Quote.Open(chNext);
319 goto skipChar;
320 } else {
321 state = SCE_SH_SCALAR;
322 skipChar:
323 i++;
324 ch = chNext;
325 chNext = chNext2;
326 }
327 } else if (ch == '*') {
328 if (chNext == '*') { // exponentiation
329 i++;
330 ch = chNext;
331 chNext = chNext2;
332 }
333 styler.ColourTo(i, SCE_SH_OPERATOR);
334 } else if (ch == '<' && chNext == '<') {
335 state = SCE_SH_HERE_DELIM;
336 HereDoc.State = 0;
337 HereDoc.Indent = false;
338 } else if (ch == '-' // file test operators
339 && isSingleCharOp(chNext)
340 && !isalnum((chNext2 = styler.SafeGetCharAt(i+2)))) {
341 styler.ColourTo(i + 1, SCE_SH_WORD);
342 state = SCE_SH_DEFAULT;
343 i++;
344 ch = chNext;
345 chNext = chNext2;
346 } else if (isBashOperator(ch)) {
347 styler.ColourTo(i, SCE_SH_OPERATOR);
348 } else {
349 // keep colouring defaults to make restart easier
350 styler.ColourTo(i, SCE_SH_DEFAULT);
351 }
352 } else if (state == SCE_SH_NUMBER) {
353 int digit = translateBashDigit(ch);
354 if (numBase == BASH_BASE_DECIMAL) {
355 if (ch == '#') {
356 numBase = getBashNumberBase(styler.GetStartSegment(), i - 1, styler);
357 if (numBase == BASH_BASE_ERROR) // take the rest as comment
358 goto numAtEnd;
359 } else if (!isdigit(ch))
360 goto numAtEnd;
361 } else if (numBase == BASH_BASE_HEX) {
362 if ((digit < 16) || (digit >= 36 && digit <= 41)) {
363 // hex digit 0-9a-fA-F
364 } else
365 goto numAtEnd;
366 } else if (numBase == BASH_BASE_OCTAL ||
367 numBase == BASH_BASE_OCTAL_ERROR) {
368 if (digit > 7) {
369 if (digit <= 9) {
370 numBase = BASH_BASE_OCTAL_ERROR;
371 } else
372 goto numAtEnd;
373 }
374 } else if (numBase == BASH_BASE_ERROR) {
375 if (digit > 9)
376 goto numAtEnd;
377 } else { // DD#DDDD number style handling
378 if (digit != BASH_BASE_ERROR) {
379 if (numBase <= 36) {
380 // case-insensitive if base<=36
381 if (digit >= 36) digit -= 26;
382 }
383 if (digit >= numBase) {
384 if (digit <= 9) {
385 numBase = BASH_BASE_ERROR;
386 } else
387 goto numAtEnd;
388 }
389 } else {
390 numAtEnd:
391 if (numBase == BASH_BASE_ERROR ||
392 numBase == BASH_BASE_OCTAL_ERROR)
393 state = SCE_SH_ERROR;
394 styler.ColourTo(i - 1, state);
395 state = SCE_SH_DEFAULT;
396 goto restartLexer;
397 }
398 }
399 } else if (state == SCE_SH_WORD) {
400 if (!iswordchar(chNext) && chNext != '+' && chNext != '-') {
401 // "." never used in Bash variable names
402 // but used in file names
403 classifyWordBash(styler.GetStartSegment(), i, keywords, styler);
404 state = SCE_SH_DEFAULT;
405 ch = ' ';
406 }
407 } else if (state == SCE_SH_IDENTIFIER) {
408 if (!iswordchar(chNext) && chNext != '+' && chNext != '-') {
409 styler.ColourTo(i, SCE_SH_IDENTIFIER);
410 state = SCE_SH_DEFAULT;
411 ch = ' ';
412 }
413 } else {
414 if (state == SCE_SH_COMMENTLINE) {
415 if (ch == '\\' && isEOLChar(chNext)) {
416 // comment continuation
417 if (chNext == '\r' && chNext2 == '\n') {
418 i += 2;
419 ch = styler.SafeGetCharAt(i);
420 chNext = styler.SafeGetCharAt(i + 1);
421 } else {
422 i++;
423 ch = chNext;
424 chNext = chNext2;
425 }
426 } else if (isEOLChar(ch)) {
427 styler.ColourTo(i - 1, state);
428 state = SCE_SH_DEFAULT;
429 goto restartLexer;
430 } else if (isEOLChar(chNext)) {
431 styler.ColourTo(i, state);
432 state = SCE_SH_DEFAULT;
433 }
434 } else if (state == SCE_SH_HERE_DELIM) {
435 //
436 // From Bash info:
437 // ---------------
438 // Specifier format is: <<[-]WORD
439 // Optional '-' is for removal of leading tabs from here-doc.
440 // Whitespace acceptable after <<[-] operator
441 //
442 if (HereDoc.State == 0) { // '<<' encountered
443 HereDoc.State = 1;
444 HereDoc.Quote = chNext;
445 HereDoc.Quoted = false;
446 HereDoc.DelimiterLength = 0;
447 HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
448 if (chNext == '\'' || chNext == '\"') { // a quoted here-doc delimiter (' or ")
449 i++;
450 ch = chNext;
451 chNext = chNext2;
452 HereDoc.Quoted = true;
453 } else if (!HereDoc.Indent && chNext == '-') { // <<- indent case
454 HereDoc.Indent = true;
455 HereDoc.State = 0;
456 } else if (isalpha(chNext) || chNext == '_' || chNext == '\\'
457 || chNext == '-' || chNext == '+' || chNext == '!') {
458 // an unquoted here-doc delimiter, no special handling
459 // TODO check what exactly bash considers part of the delim
460 } else if (chNext == '<') { // HERE string <<<
461 i++;
462 ch = chNext;
463 chNext = chNext2;
464 styler.ColourTo(i, SCE_SH_HERE_DELIM);
465 state = SCE_SH_DEFAULT;
466 HereDoc.State = 0;
467 } else if (isspacechar(chNext)) {
468 // eat whitespace
469 HereDoc.State = 0;
470 } else if (isdigit(chNext) || chNext == '=' || chNext == '$') {
471 // left shift << or <<= operator cases
472 styler.ColourTo(i, SCE_SH_OPERATOR);
473 state = SCE_SH_DEFAULT;
474 HereDoc.State = 0;
475 } else {
476 // symbols terminates; deprecated zero-length delimiter
477 }
478 } else if (HereDoc.State == 1) { // collect the delimiter
479 if (HereDoc.Quoted) { // a quoted here-doc delimiter
480 if (ch == HereDoc.Quote) { // closing quote => end of delimiter
481 styler.ColourTo(i, state);
482 state = SCE_SH_DEFAULT;
483 } else {
484 if (ch == '\\' && chNext == HereDoc.Quote) { // escaped quote
485 i++;
486 ch = chNext;
487 chNext = chNext2;
488 }
489 HereDoc.Delimiter[HereDoc.DelimiterLength++] = ch;
490 HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
491 }
492 } else { // an unquoted here-doc delimiter
493 if (isalnum(ch) || ch == '_' || ch == '-' || ch == '+' || ch == '!') {
494 HereDoc.Delimiter[HereDoc.DelimiterLength++] = ch;
495 HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
496 } else if (ch == '\\') {
497 // skip escape prefix
498 } else {
499 styler.ColourTo(i - 1, state);
500 state = SCE_SH_DEFAULT;
501 goto restartLexer;
502 }
503 }
504 if (HereDoc.DelimiterLength >= HERE_DELIM_MAX - 1) {
505 styler.ColourTo(i - 1, state);
506 state = SCE_SH_ERROR;
507 goto restartLexer;
508 }
509 }
510 } else if (HereDoc.State == 2) {
511 // state == SCE_SH_HERE_Q
512 if (isMatch(styler, lengthDoc, i, HereDoc.Delimiter)) {
513 if (!HereDoc.Indent && isEOLChar(chPrev)) {
514 endHereDoc:
515 // standard HERE delimiter
516 i += HereDoc.DelimiterLength;
517 chPrev = styler.SafeGetCharAt(i - 1);
518 ch = styler.SafeGetCharAt(i);
519 if (isEOLChar(ch)) {
520 styler.ColourTo(i - 1, state);
521 state = SCE_SH_DEFAULT;
522 HereDoc.State = 0;
523 goto restartLexer;
524 }
525 chNext = styler.SafeGetCharAt(i + 1);
526 } else if (HereDoc.Indent) {
527 // indented HERE delimiter
528 unsigned int bk = (i > 0)? i - 1: 0;
529 while (i > 0) {
530 ch = styler.SafeGetCharAt(bk--);
531 if (isEOLChar(ch)) {
532 goto endHereDoc;
533 } else if (!isspacechar(ch)) {
534 break; // got leading non-whitespace
535 }
536 }
537 }
538 }
539 } else if (state == SCE_SH_SCALAR) { // variable names
540 if (isEndVar(ch)) {
541 if ((state == SCE_SH_SCALAR)
542 && i == (styler.GetStartSegment() + 1)) {
543 // Special variable: $(, $_ etc.
544 styler.ColourTo(i, state);
545 state = SCE_SH_DEFAULT;
546 } else {
547 styler.ColourTo(i - 1, state);
548 state = SCE_SH_DEFAULT;
549 goto restartLexer;
550 }
551 }
552 } else if (state == SCE_SH_STRING
553 || state == SCE_SH_CHARACTER
554 || state == SCE_SH_BACKTICKS
555 || state == SCE_SH_PARAM
556 ) {
557 if (!Quote.Down && !isspacechar(ch)) {
558 Quote.Open(ch);
559 } else if (ch == '\\' && Quote.Up != '\\') {
560 i++;
561 ch = chNext;
562 chNext = styler.SafeGetCharAt(i + 1);
563 } else if (ch == Quote.Down) {
564 Quote.Count--;
565 if (Quote.Count == 0) {
566 Quote.Rep--;
567 if (Quote.Rep <= 0) {
568 styler.ColourTo(i, state);
569 state = SCE_SH_DEFAULT;
570 ch = ' ';
571 }
572 if (Quote.Up == Quote.Down) {
573 Quote.Count++;
574 }
575 }
576 } else if (ch == Quote.Up) {
577 Quote.Count++;
578 }
579 }
580 }
581 if (state == SCE_SH_ERROR) {
582 break;
583 }
584 chPrev = ch;
585 }
586 styler.ColourTo(lengthDoc - 1, state);
587 }
588
589 static bool IsCommentLine(int line, Accessor &styler) {
590 int pos = styler.LineStart(line);
591 int eol_pos = styler.LineStart(line + 1) - 1;
592 for (int i = pos; i < eol_pos; i++) {
593 char ch = styler[i];
594 if (ch == '#')
595 return true;
596 else if (ch != ' ' && ch != '\t')
597 return false;
598 }
599 return false;
600 }
601
602 static void FoldBashDoc(unsigned int startPos, int length, int, WordList *[],
603 Accessor &styler) {
604 bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
605 bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
606 unsigned int endPos = startPos + length;
607 int visibleChars = 0;
608 int lineCurrent = styler.GetLine(startPos);
609 int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
610 int levelCurrent = levelPrev;
611 char chNext = styler[startPos];
612 int styleNext = styler.StyleAt(startPos);
613 for (unsigned int i = startPos; i < endPos; i++) {
614 char ch = chNext;
615 chNext = styler.SafeGetCharAt(i + 1);
616 int style = styleNext;
617 styleNext = styler.StyleAt(i + 1);
618 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
619 // Comment folding
620 if (foldComment && atEOL && IsCommentLine(lineCurrent, styler))
621 {
622 if (!IsCommentLine(lineCurrent - 1, styler)
623 && IsCommentLine(lineCurrent + 1, styler))
624 levelCurrent++;
625 else if (IsCommentLine(lineCurrent - 1, styler)
626 && !IsCommentLine(lineCurrent+1, styler))
627 levelCurrent--;
628 }
629 if (style == SCE_C_OPERATOR) {
630 if (ch == '{') {
631 levelCurrent++;
632 } else if (ch == '}') {
633 levelCurrent--;
634 }
635 }
636 if (atEOL) {
637 int lev = levelPrev;
638 if (visibleChars == 0 && foldCompact)
639 lev |= SC_FOLDLEVELWHITEFLAG;
640 if ((levelCurrent > levelPrev) && (visibleChars > 0))
641 lev |= SC_FOLDLEVELHEADERFLAG;
642 if (lev != styler.LevelAt(lineCurrent)) {
643 styler.SetLevel(lineCurrent, lev);
644 }
645 lineCurrent++;
646 levelPrev = levelCurrent;
647 visibleChars = 0;
648 }
649 if (!isspacechar(ch))
650 visibleChars++;
651 }
652 // Fill in the real level of the next line, keeping the current flags as they will be filled in later
653 int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
654 styler.SetLevel(lineCurrent, levelPrev | flagsNext);
655 }
656
657 static const char * const bashWordListDesc[] = {
658 "Keywords",
659 0
660 };
661
662 LexerModule lmBash(SCLEX_BASH, ColouriseBashDoc, "bash", FoldBashDoc, bashWordListDesc);
wxWidgets (Impactor)