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Date:: Mon Nov 3 18:35:56 2008 UTC
Message:: awk: import from sources
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1 /****************************************************************
2 Copyright (C) Lucent Technologies 1997
3 All Rights Reserved
4 
5 Permission to use, copy, modify, and distribute this software and
6 its documentation for any purpose and without fee is hereby
7 granted, provided that the above copyright notice appear in all
8 copies and that both that the copyright notice and this
9 permission notice and warranty disclaimer appear in supporting
10 documentation, and that the name Lucent Technologies or any of
11 its entities not be used in advertising or publicity pertaining
12 to distribution of the software without specific, written prior
13 permission.
14 
15 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
16 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
17 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
18 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
20 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
21 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
22 THIS SOFTWARE.
23 ****************************************************************/
24 
25 %{
26 #include <stdio.h>
27 #include <string.h>
28 #include "awk.h"
29 
30 #define	makedfa(a,b)	compre(a)
31 
32 void checkdup(Node *list, Cell *item);
33 int yywrap(void) { return(1); }
34 
35 Node	*beginloc = 0;
36 Node	*endloc = 0;
37 int	infunc	= 0;	/* = 1 if in arglist or body of func */
38 int	inloop	= 0;	/* = 1 if in while, for, do */
39 char	*curfname = 0;	/* current function name */
40 Node	*arglist = 0;	/* list of args for current function */
41 %}
42 
43 %union {
44 	Node	*p;
45 	Cell	*cp;
46 	int	i;
47 	char	*s;
48 }
49 
50 %token	<i>	FIRSTTOKEN	/* must be first */
51 %token	<p>	PROGRAM PASTAT PASTAT2 XBEGIN XEND
52 %token	<i>	NL ',' '{' '(' '|' ';' '/' ')' '}' '[' ']'
53 %token	<i>	ARRAY
54 %token	<i>	MATCH NOTMATCH MATCHOP
55 %token	<i>	FINAL DOT ALL CCL NCCL CHAR OR STAR QUEST PLUS
56 %token	<i>	AND BOR APPEND EQ GE GT LE LT NE IN
57 %token	<i>	ARG BLTIN BREAK CLOSE CONTINUE DELETE DO EXIT FOR FUNC 
58 %token	<i>	SUB GSUB IF INDEX LSUBSTR MATCHFCN NEXT NEXTFILE
59 %token	<i>	ADD MINUS MULT DIVIDE MOD
60 %token	<i>	ASSIGN ASGNOP ADDEQ SUBEQ MULTEQ DIVEQ MODEQ POWEQ
61 %token	<i>	PRINT PRINTF SPRINTF
62 %token	<p>	ELSE INTEST CONDEXPR
63 %token	<i>	POSTINCR PREINCR POSTDECR PREDECR
64 %token	<cp>	VAR IVAR VARNF CALL NUMBER STRING
65 %token	<s>	REGEXPR
66 
67 %type	<p>	pas pattern ppattern plist pplist patlist prarg term re
68 %type	<p>	pa_pat pa_stat pa_stats
69 %type	<s>	reg_expr
70 %type	<p>	simple_stmt opt_simple_stmt stmt stmtlist
71 %type	<p>	var varname funcname varlist
72 %type	<p>	for if else while
73 %type	<i>	do st
74 %type	<i>	pst opt_pst lbrace rbrace rparen comma nl opt_nl and bor
75 %type	<i>	subop print
76 
77 %right	ASGNOP
78 %right	'?'
79 %right	':'
80 %left	BOR
81 %left	AND
82 %left	GETLINE
83 %nonassoc APPEND EQ GE GT LE LT NE MATCHOP IN '|'
84 %left	ARG BLTIN BREAK CALL CLOSE CONTINUE DELETE DO EXIT FOR FUNC 
85 %left	GSUB IF INDEX LSUBSTR MATCHFCN NEXT NUMBER
86 %left	PRINT PRINTF RETURN SPLIT SPRINTF STRING SUB SUBSTR
87 %left	REGEXPR VAR VARNF IVAR WHILE '('
88 %left	CAT
89 %left	'+' '-'
90 %left	'*' '/' '%'
91 %left	NOT UMINUS
92 %right	POWER
93 %right	DECR INCR
94 %left	INDIRECT
95 %token	LASTTOKEN	/* must be last */
96 
97 %%
98 
99 program:
100 	  pas	{ if (errorflag==0)
101 			winner = (Node *)stat3(PROGRAM, beginloc, $1, endloc); }
102 	| error	{ yyclearin; bracecheck(); SYNTAX("bailing out"); }
103 	;
104 
105 and:
106 	  AND | and NL
107 	;
108 
109 bor:
110 	  BOR | bor NL
111 	;
112 
113 comma:
114 	  ',' | comma NL
115 	;
116 
117 do:
118 	  DO | do NL
119 	;
120 
121 else:
122 	  ELSE | else NL
123 	;
124 
125 for:
126 	  FOR '(' opt_simple_stmt ';' opt_nl pattern ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
127 		{ --inloop; $$ = stat4(FOR, $3, notnull($6), $9, $12); }
128 	| FOR '(' opt_simple_stmt ';'  ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
129 		{ --inloop; $$ = stat4(FOR, $3, NIL, $7, $10); }
130 	| FOR '(' varname IN varname rparen {inloop++;} stmt
131 		{ --inloop; $$ = stat3(IN, $3, makearr($5), $8); }
132 	;
133 
134 funcname:
135 	  VAR	{ setfname($1); }
136 	| CALL	{ setfname($1); }
137 	;
138 
139 if:
140 	  IF '(' pattern rparen		{ $$ = notnull($3); }
141 	;
142 
143 lbrace:
144 	  '{' | lbrace NL
145 	;
146 
147 nl:
148 	  NL | nl NL
149 	;
150 
151 opt_nl:
152 	  /* empty */	{ $$ = 0; }
153 	| nl
154 	;
155 
156 opt_pst:
157 	  /* empty */	{ $$ = 0; }
158 	| pst
159 	;
160 
161 
162 opt_simple_stmt:
163 	  /* empty */			{ $$ = 0; }
164 	| simple_stmt
165 	;
166 
167 pas:
168 	  opt_pst			{ $$ = 0; }
169 	| opt_pst pa_stats opt_pst	{ $$ = $2; }
170 	;
171 
172 pa_pat:
173 	  pattern	{ $$ = notnull($1); }
174 	;
175 
176 pa_stat:
177 	  pa_pat			{ $$ = stat2(PASTAT, $1, stat2(PRINT, rectonode(), NIL)); }
178 	| pa_pat lbrace stmtlist '}'	{ $$ = stat2(PASTAT, $1, $3); }
179 	| pa_pat ',' pa_pat		{ $$ = pa2stat($1, $3, stat2(PRINT, rectonode(), NIL)); }
180 	| pa_pat ',' pa_pat lbrace stmtlist '}'	{ $$ = pa2stat($1, $3, $5); }
181 	| lbrace stmtlist '}'		{ $$ = stat2(PASTAT, NIL, $2); }
182 	| XBEGIN lbrace stmtlist '}'
183 		{ beginloc = linkum(beginloc, $3); $$ = 0; }
184 	| XEND lbrace stmtlist '}'
185 		{ endloc = linkum(endloc, $3); $$ = 0; }
186 	| FUNC funcname '(' varlist rparen {infunc++;} lbrace stmtlist '}'
187 		{ infunc--; curfname=0; defn((Cell *)$2, $4, $8); $$ = 0; }
188 	;
189 
190 pa_stats:
191 	  pa_stat
192 	| pa_stats opt_pst pa_stat	{ $$ = linkum($1, $3); }
193 	;
194 
195 patlist:
196 	  pattern
197 	| patlist comma pattern		{ $$ = linkum($1, $3); }
198 	;
199 
200 ppattern:
201 	  var ASGNOP ppattern		{ $$ = op2($2, $1, $3); }
202 	| ppattern '?' ppattern ':' ppattern %prec '?'
203 	 	{ $$ = op3(CONDEXPR, notnull($1), $3, $5); }
204 	| ppattern bor ppattern %prec BOR
205 		{ $$ = op2(BOR, notnull($1), notnull($3)); }
206 	| ppattern and ppattern %prec AND
207 		{ $$ = op2(AND, notnull($1), notnull($3)); }
208 	| ppattern MATCHOP reg_expr	{ $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
209 	| ppattern MATCHOP ppattern
210 		{ if (constnode($3))
211 			$$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
212 		  else
213 			$$ = op3($2, (Node *)1, $1, $3); }
214 	| ppattern IN varname		{ $$ = op2(INTEST, $1, makearr($3)); }
215 	| '(' plist ')' IN varname	{ $$ = op2(INTEST, $2, makearr($5)); }
216 	| ppattern term %prec CAT	{ $$ = op2(CAT, $1, $2); }
217 	| re
218 	| term
219 	;
220 
221 pattern:
222 	  var ASGNOP pattern		{ $$ = op2($2, $1, $3); }
223 	| pattern '?' pattern ':' pattern %prec '?'
224 	 	{ $$ = op3(CONDEXPR, notnull($1), $3, $5); }
225 	| pattern bor pattern %prec BOR
226 		{ $$ = op2(BOR, notnull($1), notnull($3)); }
227 	| pattern and pattern %prec AND
228 		{ $$ = op2(AND, notnull($1), notnull($3)); }
229 	| pattern EQ pattern		{ $$ = op2($2, $1, $3); }
230 	| pattern GE pattern		{ $$ = op2($2, $1, $3); }
231 	| pattern GT pattern		{ $$ = op2($2, $1, $3); }
232 	| pattern LE pattern		{ $$ = op2($2, $1, $3); }
233 	| pattern LT pattern		{ $$ = op2($2, $1, $3); }
234 	| pattern NE pattern		{ $$ = op2($2, $1, $3); }
235 	| pattern MATCHOP reg_expr	{ $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
236 	| pattern MATCHOP pattern
237 		{ if (constnode($3))
238 			$$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
239 		  else
240 			$$ = op3($2, (Node *)1, $1, $3); }
241 	| pattern IN varname		{ $$ = op2(INTEST, $1, makearr($3)); }
242 	| '(' plist ')' IN varname	{ $$ = op2(INTEST, $2, makearr($5)); }
243 	| pattern '|' GETLINE var	{ 
244 			if (safe) SYNTAX("cmd | getline is unsafe");
245 			else $$ = op3(GETLINE, $4, itonp($2), $1); }
246 	| pattern '|' GETLINE		{ 
247 			if (safe) SYNTAX("cmd | getline is unsafe");
248 			else $$ = op3(GETLINE, (Node*)0, itonp($2), $1); }
249 	| pattern term %prec CAT	{ $$ = op2(CAT, $1, $2); }
250 	| re
251 	| term
252 	;
253 
254 plist:
255 	  pattern comma pattern		{ $$ = linkum($1, $3); }
256 	| plist comma pattern		{ $$ = linkum($1, $3); }
257 	;
258 
259 pplist:
260 	  ppattern
261 	| pplist comma ppattern		{ $$ = linkum($1, $3); }
262 	;
263 
264 prarg:
265 	  /* empty */			{ $$ = rectonode(); }
266 	| pplist
267 	| '(' plist ')'			{ $$ = $2; }
268 	;
269 
270 print:
271 	  PRINT | PRINTF
272 	;
273 
274 pst:
275 	  NL | ';' | pst NL | pst ';'
276 	;
277 
278 rbrace:
279 	  '}' | rbrace NL
280 	;
281 
282 re:
283 	   reg_expr
284 		{ $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); }
285 	| NOT re	{ $$ = op1(NOT, notnull($2)); }
286 	;
287 
288 reg_expr:
289 	  '/' {startreg();} REGEXPR '/'		{ $$ = $3; }
290 	;
291 
292 rparen:
293 	  ')' | rparen NL
294 	;
295 
296 simple_stmt:
297 	  print prarg '|' term		{ 
298 			if (safe) SYNTAX("print | is unsafe");
299 			else $$ = stat3($1, $2, itonp($3), $4); }
300 	| print prarg APPEND term	{
301 			if (safe) SYNTAX("print >> is unsafe");
302 			else $$ = stat3($1, $2, itonp($3), $4); }
303 	| print prarg GT term		{
304 			if (safe) SYNTAX("print > is unsafe");
305 			else $$ = stat3($1, $2, itonp($3), $4); }
306 	| print prarg			{ $$ = stat3($1, $2, NIL, NIL); }
307 	| DELETE varname '[' patlist ']' { $$ = stat2(DELETE, makearr($2), $4); }
308 	| DELETE varname		 { $$ = stat2(DELETE, makearr($2), 0); }
309 	| pattern			{ $$ = exptostat($1); }
310 	| error				{ yyclearin; SYNTAX("illegal statement"); }
311 	;
312 
313 st:
314 	  nl
315 	| ';' opt_nl
316 	;
317 
318 stmt:
319 	  BREAK st		{ if (!inloop) SYNTAX("break illegal outside of loops");
320 				  $$ = stat1(BREAK, NIL); }
321 	| CLOSE pattern st	{ $$ = stat1(CLOSE, $2); }
322 	| CONTINUE st		{  if (!inloop) SYNTAX("continue illegal outside of loops");
323 				  $$ = stat1(CONTINUE, NIL); }
324 	| do {inloop++;} stmt {--inloop;} WHILE '(' pattern ')' st
325 		{ $$ = stat2(DO, $3, notnull($7)); }
326 	| EXIT pattern st	{ $$ = stat1(EXIT, $2); }
327 	| EXIT st		{ $$ = stat1(EXIT, NIL); }
328 	| for
329 	| if stmt else stmt	{ $$ = stat3(IF, $1, $2, $4); }
330 	| if stmt		{ $$ = stat3(IF, $1, $2, NIL); }
331 	| lbrace stmtlist rbrace { $$ = $2; }
332 	| NEXT st	{ if (infunc)
333 				SYNTAX("next is illegal inside a function");
334 			  $$ = stat1(NEXT, NIL); }
335 	| NEXTFILE st	{ if (infunc)
336 				SYNTAX("nextfile is illegal inside a function");
337 			  $$ = stat1(NEXTFILE, NIL); }
338 	| RETURN pattern st	{ $$ = stat1(RETURN, $2); }
339 	| RETURN st		{ $$ = stat1(RETURN, NIL); }
340 	| simple_stmt st
341 	| while {inloop++;} stmt	{ --inloop; $$ = stat2(WHILE, $1, $3); }
342 	| ';' opt_nl		{ $$ = 0; }
343 	;
344 
345 stmtlist:
346 	  stmt
347 	| stmtlist stmt		{ $$ = linkum($1, $2); }
348 	;
349 
350 subop:
351 	  SUB | GSUB
352 	;
353 
354 term:
355  	  term '/' ASGNOP term		{ $$ = op2(DIVEQ, $1, $4); }
356  	| term '+' term			{ $$ = op2(ADD, $1, $3); }
357 	| term '-' term			{ $$ = op2(MINUS, $1, $3); }
358 	| term '*' term			{ $$ = op2(MULT, $1, $3); }
359 	| term '/' term			{ $$ = op2(DIVIDE, $1, $3); }
360 	| term '%' term			{ $$ = op2(MOD, $1, $3); }
361 	| term POWER term		{ $$ = op2(POWER, $1, $3); }
362 	| '-' term %prec UMINUS		{ $$ = op1(UMINUS, $2); }
363 	| '+' term %prec UMINUS		{ $$ = $2; }
364 	| NOT term %prec UMINUS		{ $$ = op1(NOT, notnull($2)); }
365 	| BLTIN '(' ')'			{ $$ = op2(BLTIN, itonp($1), rectonode()); }
366 	| BLTIN '(' patlist ')'		{ $$ = op2(BLTIN, itonp($1), $3); }
367 	| BLTIN				{ $$ = op2(BLTIN, itonp($1), rectonode()); }
368 	| CALL '(' ')'			{ $$ = op2(CALL, celltonode($1,CVAR), NIL); }
369 	| CALL '(' patlist ')'		{ $$ = op2(CALL, celltonode($1,CVAR), $3); }
370 	| DECR var			{ $$ = op1(PREDECR, $2); }
371 	| INCR var			{ $$ = op1(PREINCR, $2); }
372 	| var DECR			{ $$ = op1(POSTDECR, $1); }
373 	| var INCR			{ $$ = op1(POSTINCR, $1); }
374 	| GETLINE var LT term		{ $$ = op3(GETLINE, $2, itonp($3), $4); }
375 	| GETLINE LT term		{ $$ = op3(GETLINE, NIL, itonp($2), $3); }
376 	| GETLINE var			{ $$ = op3(GETLINE, $2, NIL, NIL); }
377 	| GETLINE			{ $$ = op3(GETLINE, NIL, NIL, NIL); }
378 	| INDEX '(' pattern comma pattern ')'
379 		{ $$ = op2(INDEX, $3, $5); }
380 	| INDEX '(' pattern comma reg_expr ')'
381 		{ SYNTAX("index() doesn't permit regular expressions");
382 		  $$ = op2(INDEX, $3, (Node*)$5); }
383 	| '(' pattern ')'		{ $$ = $2; }
384 	| MATCHFCN '(' pattern comma reg_expr ')'
385 		{ $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa($5, 1)); }
386 	| MATCHFCN '(' pattern comma pattern ')'
387 		{ if (constnode($5))
388 			$$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1));
389 		  else
390 			$$ = op3(MATCHFCN, (Node *)1, $3, $5); }
391 	| NUMBER			{ $$ = celltonode($1, CCON); }
392 	| SPLIT '(' pattern comma varname comma pattern ')'     /* string */
393 		{ $$ = op4(SPLIT, $3, makearr($5), $7, (Node*)STRING); }
394 	| SPLIT '(' pattern comma varname comma reg_expr ')'    /* const /regexp/ */
395 		{ $$ = op4(SPLIT, $3, makearr($5), (Node*)makedfa($7, 1), (Node *)REGEXPR); }
396 	| SPLIT '(' pattern comma varname ')'
397 		{ $$ = op4(SPLIT, $3, makearr($5), NIL, (Node*)STRING); }  /* default */
398 	| SPRINTF '(' patlist ')'	{ $$ = op1($1, $3); }
399 	| STRING	 		{ $$ = celltonode($1, CCON); }
400 	| subop '(' reg_expr comma pattern ')'
401 		{ $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); }
402 	| subop '(' pattern comma pattern ')'
403 		{ if (constnode($3))
404 			$$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode());
405 		  else
406 			$$ = op4($1, (Node *)1, $3, $5, rectonode()); }
407 	| subop '(' reg_expr comma pattern comma var ')'
408 		{ $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, $7); }
409 	| subop '(' pattern comma pattern comma var ')'
410 		{ if (constnode($3))
411 			$$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7);
412 		  else
413 			$$ = op4($1, (Node *)1, $3, $5, $7); }
414 	| SUBSTR '(' pattern comma pattern comma pattern ')'
415 		{ $$ = op3(SUBSTR, $3, $5, $7); }
416 	| SUBSTR '(' pattern comma pattern ')'
417 		{ $$ = op3(SUBSTR, $3, $5, NIL); }
418 	| var
419 	;
420 
421 var:
422 	  varname
423 	| varname '[' patlist ']'	{ $$ = op2(ARRAY, makearr($1), $3); }
424 	| IVAR				{ $$ = op1(INDIRECT, celltonode($1, CVAR)); }
425 	| INDIRECT term	 		{ $$ = op1(INDIRECT, $2); }
426 	;	
427 
428 varlist:
429 	  /* nothing */		{ arglist = $$ = 0; }
430 	| VAR			{ arglist = $$ = celltonode($1,CVAR); }
431 	| varlist comma VAR	{
432 			checkdup($1, $3);
433 			arglist = $$ = linkum($1,celltonode($3,CVAR)); }
434 	;
435 
436 varname:
437 	  VAR			{ $$ = celltonode($1, CVAR); }
438 	| ARG 			{ $$ = op1(ARG, itonp($1)); }
439 	| VARNF			{ $$ = op1(VARNF, (Node *) $1); }
440 	;
441 
442 
443 while:
444 	  WHILE '(' pattern rparen	{ $$ = notnull($3); }
445 	;
446 
447 %%
448 
449 void setfname(Cell *p)
450 {
451 	if (isarr(p))
452 		SYNTAX("%s is an array, not a function", p->nval);
453 	else if (isfcn(p))
454 		SYNTAX("you can't define function %s more than once", p->nval);
455 	curfname = p->nval;
456 }
457 
458 int constnode(Node *p)
459 {
460 	return isvalue(p) && ((Cell *) (p->narg[0]))->csub == CCON;
461 }
462 
463 char *strnode(Node *p)
464 {
465 	return ((Cell *)(p->narg[0]))->sval;
466 }
467 
468 Node *notnull(Node *n)
469 {
470 	switch (n->nobj) {
471 	case LE: case LT: case EQ: case NE: case GT: case GE:
472 	case BOR: case AND: case NOT:
473 		return n;
474 	default:
475 		return op2(NE, n, nullnode);
476 	}
477 }
478 
479 void checkdup(Node *vl, Cell *cp)	/* check if name already in list */
480 {
481 	char *s = cp->nval;
482 	for ( ; vl; vl = vl->nnext) {
483 		if (strcmp(s, ((Cell *)(vl->narg[0]))->nval) == 0) {
484 			SYNTAX("duplicate argument %s", s);
485 			break;
486 		}
487 	}
488 }
489