xref: /freebsd/contrib/one-true-awk/awkgram.y (revision 02e9120893770924227138ba49df1edb3896112a)
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 void checkdup(Node *list, Cell *item);
31 int yywrap(void) { return(1); }
32 
33 Node	*beginloc = 0;
34 Node	*endloc = 0;
35 bool	infunc	= false;	/* = true if in arglist or body of func */
36 int	inloop	= 0;	/* >= 1 if in while, for, do; can't be bool, since loops can next */
37 char	*curfname = 0;	/* current function name */
38 Node	*arglist = 0;	/* list of args for current function */
39 %}
40 
41 %union {
42 	Node	*p;
43 	Cell	*cp;
44 	int	i;
45 	char	*s;
46 }
47 
48 %token	<i>	FIRSTTOKEN	/* must be first */
49 %token	<p>	PROGRAM PASTAT PASTAT2 XBEGIN XEND
50 %token	<i>	NL ',' '{' '(' '|' ';' '/' ')' '}' '[' ']'
51 %token	<i>	ARRAY
52 %token	<i>	MATCH NOTMATCH MATCHOP
53 %token	<i>	FINAL DOT ALL CCL NCCL CHAR OR STAR QUEST PLUS EMPTYRE ZERO
54 %token	<i>	AND BOR APPEND EQ GE GT LE LT NE IN
55 %token	<i>	ARG BLTIN BREAK CLOSE CONTINUE DELETE DO EXIT FOR FUNC
56 %token	<i>	GENSUB SUB GSUB IF INDEX LSUBSTR MATCHFCN NEXT NEXTFILE
57 %token	<i>	ADD MINUS MULT DIVIDE MOD
58 %token	<i>	ASSIGN ASGNOP ADDEQ SUBEQ MULTEQ DIVEQ MODEQ POWEQ
59 %token	<i>	PRINT PRINTF SPRINTF
60 %token	<p>	ELSE INTEST CONDEXPR
61 %token	<i>	POSTINCR PREINCR POSTDECR PREDECR
62 %token	<cp>	VAR IVAR VARNF CALL NUMBER STRING
63 %token	<s>	REGEXPR
64 
65 %type	<p>	pas pattern ppattern plist pplist patlist prarg term re
66 %type	<p>	pa_pat pa_stat pa_stats
67 %type	<s>	reg_expr
68 %type	<p>	simple_stmt opt_simple_stmt stmt stmtlist
69 %type	<p>	var varname funcname varlist
70 %type	<p>	for if else while
71 %type	<i>	do st
72 %type	<i>	pst opt_pst lbrace rbrace rparen comma nl opt_nl and bor
73 %type	<i>	subop print
74 %type	<cp>	string
75 
76 %right	ASGNOP
77 %right	'?'
78 %right	':'
79 %left	BOR
80 %left	AND
81 %left	GETLINE
82 %nonassoc APPEND EQ GE GT LE LT NE MATCHOP IN '|'
83 %left	ARG BLTIN BREAK CALL CLOSE CONTINUE DELETE DO EXIT FOR FUNC
84 %left	GSUB IF INDEX LSUBSTR MATCHFCN NEXT NUMBER
85 %left	PRINT PRINTF RETURN SPLIT SPRINTF STRING SUB SUBSTR
86 %left	REGEXPR VAR VARNF IVAR WHILE '('
87 %left	CAT
88 %left	'+' '-'
89 %left	'*' '/' '%'
90 %left	NOT UMINUS UPLUS
91 %right	POWER
92 %right	DECR INCR
93 %left	INDIRECT
94 %token	LASTTOKEN	/* must be last */
95 
96 %%
97 
98 program:
99 	  pas	{ if (errorflag==0)
100 			winner = (Node *)stat3(PROGRAM, beginloc, $1, endloc); }
101 	| error	{ yyclearin; bracecheck(); SYNTAX("bailing out"); }
102 	;
103 
104 and:
105 	  AND | and NL
106 	;
107 
108 bor:
109 	  BOR | bor NL
110 	;
111 
112 comma:
113 	  ',' | comma NL
114 	;
115 
116 do:
117 	  DO | do NL
118 	;
119 
120 else:
121 	  ELSE | else NL
122 	;
123 
124 for:
125 	  FOR '(' opt_simple_stmt ';' opt_nl pattern ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
126 		{ --inloop; $$ = stat4(FOR, $3, notnull($6), $9, $12); }
127 	| FOR '(' opt_simple_stmt ';'  ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
128 		{ --inloop; $$ = stat4(FOR, $3, NIL, $7, $10); }
129 	| FOR '(' varname IN varname rparen {inloop++;} stmt
130 		{ --inloop; $$ = stat3(IN, $3, makearr($5), $8); }
131 	;
132 
133 funcname:
134 	  VAR	{ setfname($1); }
135 	| CALL	{ setfname($1); }
136 	;
137 
138 if:
139 	  IF '(' pattern rparen		{ $$ = notnull($3); }
140 	;
141 
142 lbrace:
143 	  '{' | lbrace NL
144 	;
145 
146 nl:
147 	  NL | nl NL
148 	;
149 
150 opt_nl:
151 	  /* empty */	{ $$ = 0; }
152 	| nl
153 	;
154 
155 opt_pst:
156 	  /* empty */	{ $$ = 0; }
157 	| pst
158 	;
159 
160 
161 opt_simple_stmt:
162 	  /* empty */			{ $$ = 0; }
163 	| simple_stmt
164 	;
165 
166 pas:
167 	  opt_pst			{ $$ = 0; }
168 	| opt_pst pa_stats opt_pst	{ $$ = $2; }
169 	;
170 
171 pa_pat:
172 	  pattern	{ $$ = notnull($1); }
173 	;
174 
175 pa_stat:
176 	  pa_pat			{ $$ = stat2(PASTAT, $1, stat2(PRINT, rectonode(), NIL)); }
177 	| pa_pat lbrace stmtlist '}'	{ $$ = stat2(PASTAT, $1, $3); }
178 	| pa_pat ',' opt_nl pa_pat		{ $$ = pa2stat($1, $4, stat2(PRINT, rectonode(), NIL)); }
179 	| pa_pat ',' opt_nl pa_pat lbrace stmtlist '}'	{ $$ = pa2stat($1, $4, $6); }
180 	| lbrace stmtlist '}'		{ $$ = stat2(PASTAT, NIL, $2); }
181 	| XBEGIN lbrace stmtlist '}'
182 		{ beginloc = linkum(beginloc, $3); $$ = 0; }
183 	| XEND lbrace stmtlist '}'
184 		{ endloc = linkum(endloc, $3); $$ = 0; }
185 	| FUNC funcname '(' varlist rparen {infunc = true;} lbrace stmtlist '}'
186 		{ infunc = false; curfname=0; defn((Cell *)$2, $4, $8); $$ = 0; }
187 	;
188 
189 pa_stats:
190 	  pa_stat
191 	| pa_stats opt_pst pa_stat	{ $$ = linkum($1, $3); }
192 	;
193 
194 patlist:
195 	  pattern
196 	| patlist comma pattern		{ $$ = linkum($1, $3); }
197 	;
198 
199 ppattern:
200 	  var ASGNOP ppattern		{ $$ = op2($2, $1, $3); }
201 	| ppattern '?' ppattern ':' ppattern %prec '?'
202 	 	{ $$ = op3(CONDEXPR, notnull($1), $3, $5); }
203 	| ppattern bor ppattern %prec BOR
204 		{ $$ = op2(BOR, notnull($1), notnull($3)); }
205 	| ppattern and ppattern %prec AND
206 		{ $$ = op2(AND, notnull($1), notnull($3)); }
207 	| ppattern MATCHOP reg_expr	{ $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
208 	| ppattern MATCHOP ppattern
209 		{ if (constnode($3))
210 			$$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
211 		  else
212 			$$ = op3($2, (Node *)1, $1, $3); }
213 	| ppattern IN varname		{ $$ = op2(INTEST, $1, makearr($3)); }
214 	| '(' plist ')' IN varname	{ $$ = op2(INTEST, $2, makearr($5)); }
215 	| ppattern term %prec CAT	{ $$ = op2(CAT, $1, $2); }
216 	| re
217 	| term
218 	;
219 
220 pattern:
221 	  var ASGNOP pattern		{ $$ = op2($2, $1, $3); }
222 	| pattern '?' pattern ':' pattern %prec '?'
223 	 	{ $$ = op3(CONDEXPR, notnull($1), $3, $5); }
224 	| pattern bor pattern %prec BOR
225 		{ $$ = op2(BOR, notnull($1), notnull($3)); }
226 	| pattern and pattern %prec AND
227 		{ $$ = op2(AND, notnull($1), notnull($3)); }
228 	| pattern EQ pattern		{ $$ = op2($2, $1, $3); }
229 	| pattern GE pattern		{ $$ = op2($2, $1, $3); }
230 	| pattern GT pattern		{ $$ = op2($2, $1, $3); }
231 	| pattern LE pattern		{ $$ = op2($2, $1, $3); }
232 	| pattern LT pattern		{ $$ = op2($2, $1, $3); }
233 	| pattern NE pattern		{ $$ = op2($2, $1, $3); }
234 	| pattern MATCHOP reg_expr	{ $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
235 	| pattern MATCHOP pattern
236 		{ if (constnode($3))
237 			$$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
238 		  else
239 			$$ = op3($2, (Node *)1, $1, $3); }
240 	| pattern IN varname		{ $$ = op2(INTEST, $1, makearr($3)); }
241 	| '(' plist ')' IN varname	{ $$ = op2(INTEST, $2, makearr($5)); }
242 	| pattern '|' GETLINE var	{
243 			if (safe) SYNTAX("cmd | getline is unsafe");
244 			else $$ = op3(GETLINE, $4, itonp($2), $1); }
245 	| pattern '|' GETLINE		{
246 			if (safe) SYNTAX("cmd | getline is unsafe");
247 			else $$ = op3(GETLINE, (Node*)0, itonp($2), $1); }
248 	| pattern term %prec CAT	{ $$ = op2(CAT, $1, $2); }
249 	| re
250 	| term
251 	;
252 
253 plist:
254 	  pattern comma pattern		{ $$ = linkum($1, $3); }
255 	| plist comma pattern		{ $$ = linkum($1, $3); }
256 	;
257 
258 pplist:
259 	  ppattern
260 	| pplist comma ppattern		{ $$ = linkum($1, $3); }
261 	;
262 
263 prarg:
264 	  /* empty */			{ $$ = rectonode(); }
265 	| pplist
266 	| '(' plist ')'			{ $$ = $2; }
267 	;
268 
269 print:
270 	  PRINT | PRINTF
271 	;
272 
273 pst:
274 	  NL | ';' | pst NL | pst ';'
275 	;
276 
277 rbrace:
278 	  '}' | rbrace NL
279 	;
280 
281 re:
282 	   reg_expr
283 		{ $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); }
284 	| NOT re	{ $$ = op1(NOT, notnull($2)); }
285 	;
286 
287 reg_expr:
288 	  '/' {startreg();} REGEXPR '/'		{ $$ = $3; }
289 	;
290 
291 rparen:
292 	  ')' | rparen NL
293 	;
294 
295 simple_stmt:
296 	  print prarg '|' term		{
297 			if (safe) SYNTAX("print | is unsafe");
298 			else $$ = stat3($1, $2, itonp($3), $4); }
299 	| print prarg APPEND term	{
300 			if (safe) SYNTAX("print >> is unsafe");
301 			else $$ = stat3($1, $2, itonp($3), $4); }
302 	| print prarg GT term		{
303 			if (safe) SYNTAX("print > is unsafe");
304 			else $$ = stat3($1, $2, itonp($3), $4); }
305 	| print prarg			{ $$ = stat3($1, $2, NIL, NIL); }
306 	| DELETE varname '[' patlist ']' { $$ = stat2(DELETE, makearr($2), $4); }
307 	| DELETE varname		 { $$ = stat2(DELETE, makearr($2), 0); }
308 	| pattern			{ $$ = exptostat($1); }
309 	| error				{ yyclearin; SYNTAX("illegal statement"); }
310 	;
311 
312 st:
313 	  nl
314 	| ';' opt_nl
315 	;
316 
317 stmt:
318 	  BREAK st		{ if (!inloop) SYNTAX("break illegal outside of loops");
319 				  $$ = stat1(BREAK, NIL); }
320 	| CONTINUE st		{  if (!inloop) SYNTAX("continue illegal outside of loops");
321 				  $$ = stat1(CONTINUE, NIL); }
322 	| do {inloop++;} stmt {--inloop;} WHILE '(' pattern ')' st
323 		{ $$ = stat2(DO, $3, notnull($7)); }
324 	| EXIT pattern st	{ $$ = stat1(EXIT, $2); }
325 	| EXIT st		{ $$ = stat1(EXIT, NIL); }
326 	| for
327 	| if stmt else stmt	{ $$ = stat3(IF, $1, $2, $4); }
328 	| if stmt		{ $$ = stat3(IF, $1, $2, NIL); }
329 	| lbrace stmtlist rbrace { $$ = $2; }
330 	| NEXT st	{ if (infunc)
331 				SYNTAX("next is illegal inside a function");
332 			  $$ = stat1(NEXT, NIL); }
333 	| NEXTFILE st	{ if (infunc)
334 				SYNTAX("nextfile is illegal inside a function");
335 			  $$ = stat1(NEXTFILE, NIL); }
336 	| RETURN pattern st	{ $$ = stat1(RETURN, $2); }
337 	| RETURN st		{ $$ = stat1(RETURN, NIL); }
338 	| simple_stmt st
339 	| while {inloop++;} stmt	{ --inloop; $$ = stat2(WHILE, $1, $3); }
340 	| ';' opt_nl		{ $$ = 0; }
341 	;
342 
343 stmtlist:
344 	  stmt
345 	| stmtlist stmt		{ $$ = linkum($1, $2); }
346 	;
347 
348 subop:
349 	  SUB | GSUB
350 	;
351 
352 string:
353 	  STRING
354 	| string STRING		{ $$ = catstr($1, $2); }
355 	;
356 
357 term:
358  	  term '/' ASGNOP term		{ $$ = op2(DIVEQ, $1, $4); }
359  	| term '+' term			{ $$ = op2(ADD, $1, $3); }
360 	| term '-' term			{ $$ = op2(MINUS, $1, $3); }
361 	| term '*' term			{ $$ = op2(MULT, $1, $3); }
362 	| term '/' term			{ $$ = op2(DIVIDE, $1, $3); }
363 	| term '%' term			{ $$ = op2(MOD, $1, $3); }
364 	| term POWER term		{ $$ = op2(POWER, $1, $3); }
365 	| '-' term %prec UMINUS		{ $$ = op1(UMINUS, $2); }
366 	| '+' term %prec UMINUS		{ $$ = op1(UPLUS, $2); }
367 	| NOT term %prec UMINUS		{ $$ = op1(NOT, notnull($2)); }
368 	| BLTIN '(' ')'			{ $$ = op2(BLTIN, itonp($1), rectonode()); }
369 	| BLTIN '(' patlist ')'		{ $$ = op2(BLTIN, itonp($1), $3); }
370 	| BLTIN				{ $$ = op2(BLTIN, itonp($1), rectonode()); }
371 	| CALL '(' ')'			{ $$ = op2(CALL, celltonode($1,CVAR), NIL); }
372 	| CALL '(' patlist ')'		{ $$ = op2(CALL, celltonode($1,CVAR), $3); }
373 	| CLOSE term			{ $$ = op1(CLOSE, $2); }
374 	| DECR var			{ $$ = op1(PREDECR, $2); }
375 	| INCR var			{ $$ = op1(PREINCR, $2); }
376 	| var DECR			{ $$ = op1(POSTDECR, $1); }
377 	| var INCR			{ $$ = op1(POSTINCR, $1); }
378 	| GENSUB '(' reg_expr comma pattern comma pattern ')'
379 		{ $$ = op5(GENSUB, NIL, (Node*)makedfa($3, 1), $5, $7, rectonode()); }
380 	| GENSUB '(' pattern comma pattern comma pattern ')'
381 		{ if (constnode($3))
382 			$$ = op5(GENSUB, NIL, (Node *)makedfa(strnode($3), 1), $5, $7, rectonode());
383 		  else
384 			$$ = op5(GENSUB, (Node *)1, $3, $5, $7, rectonode());
385 		}
386 	| GENSUB '(' reg_expr comma pattern comma pattern comma pattern ')'
387 		{ $$ = op5(GENSUB, NIL, (Node*)makedfa($3, 1), $5, $7, $9); }
388 	| GENSUB '(' pattern comma pattern comma pattern comma pattern ')'
389 		{ if (constnode($3))
390 			$$ = op5(GENSUB, NIL, (Node *)makedfa(strnode($3),1), $5,$7,$9);
391 		  else
392 			$$ = op5(GENSUB, (Node *)1, $3, $5, $7, $9);
393 		}
394 	| GETLINE var LT term		{ $$ = op3(GETLINE, $2, itonp($3), $4); }
395 	| GETLINE LT term		{ $$ = op3(GETLINE, NIL, itonp($2), $3); }
396 	| GETLINE var			{ $$ = op3(GETLINE, $2, NIL, NIL); }
397 	| GETLINE			{ $$ = op3(GETLINE, NIL, NIL, NIL); }
398 	| INDEX '(' pattern comma pattern ')'
399 		{ $$ = op2(INDEX, $3, $5); }
400 	| INDEX '(' pattern comma reg_expr ')'
401 		{ SYNTAX("index() doesn't permit regular expressions");
402 		  $$ = op2(INDEX, $3, (Node*)$5); }
403 	| '(' pattern ')'		{ $$ = $2; }
404 	| MATCHFCN '(' pattern comma reg_expr ')'
405 		{ $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa($5, 1)); }
406 	| MATCHFCN '(' pattern comma pattern ')'
407 		{ if (constnode($5))
408 			$$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1));
409 		  else
410 			$$ = op3(MATCHFCN, (Node *)1, $3, $5); }
411 	| NUMBER			{ $$ = celltonode($1, CCON); }
412 	| SPLIT '(' pattern comma varname comma pattern ')'     /* string */
413 		{ $$ = op4(SPLIT, $3, makearr($5), $7, (Node*)STRING); }
414 	| SPLIT '(' pattern comma varname comma reg_expr ')'    /* const /regexp/ */
415 		{ $$ = op4(SPLIT, $3, makearr($5), (Node*)makedfa($7, 1), (Node *)REGEXPR); }
416 	| SPLIT '(' pattern comma varname ')'
417 		{ $$ = op4(SPLIT, $3, makearr($5), NIL, (Node*)STRING); }  /* default */
418 	| SPRINTF '(' patlist ')'	{ $$ = op1($1, $3); }
419 	| string	 		{ $$ = celltonode($1, CCON); }
420 	| subop '(' reg_expr comma pattern ')'
421 		{ $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); }
422 	| subop '(' pattern comma pattern ')'
423 		{ if (constnode($3))
424 			$$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode());
425 		  else
426 			$$ = op4($1, (Node *)1, $3, $5, rectonode()); }
427 	| subop '(' reg_expr comma pattern comma var ')'
428 		{ $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, $7); }
429 	| subop '(' pattern comma pattern comma var ')'
430 		{ if (constnode($3))
431 			$$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7);
432 		  else
433 			$$ = op4($1, (Node *)1, $3, $5, $7); }
434 	| SUBSTR '(' pattern comma pattern comma pattern ')'
435 		{ $$ = op3(SUBSTR, $3, $5, $7); }
436 	| SUBSTR '(' pattern comma pattern ')'
437 		{ $$ = op3(SUBSTR, $3, $5, NIL); }
438 	| var
439 	;
440 
441 var:
442 	  varname
443 	| varname '[' patlist ']'	{ $$ = op2(ARRAY, makearr($1), $3); }
444 	| IVAR				{ $$ = op1(INDIRECT, celltonode($1, CVAR)); }
445 	| INDIRECT term	 		{ $$ = op1(INDIRECT, $2); }
446 	;
447 
448 varlist:
449 	  /* nothing */		{ arglist = $$ = 0; }
450 	| VAR			{ arglist = $$ = celltonode($1,CVAR); }
451 	| varlist comma VAR	{
452 			checkdup($1, $3);
453 			arglist = $$ = linkum($1,celltonode($3,CVAR)); }
454 	;
455 
456 varname:
457 	  VAR			{ $$ = celltonode($1, CVAR); }
458 	| ARG 			{ $$ = op1(ARG, itonp($1)); }
459 	| VARNF			{ $$ = op1(VARNF, (Node *) $1); }
460 	;
461 
462 
463 while:
464 	  WHILE '(' pattern rparen	{ $$ = notnull($3); }
465 	;
466 
467 %%
468 
469 void setfname(Cell *p)
470 {
471 	if (isarr(p))
472 		SYNTAX("%s is an array, not a function", p->nval);
473 	else if (isfcn(p))
474 		SYNTAX("you can't define function %s more than once", p->nval);
475 	curfname = p->nval;
476 }
477 
478 int constnode(Node *p)
479 {
480 	return isvalue(p) && ((Cell *) (p->narg[0]))->csub == CCON;
481 }
482 
483 char *strnode(Node *p)
484 {
485 	return ((Cell *)(p->narg[0]))->sval;
486 }
487 
488 Node *notnull(Node *n)
489 {
490 	switch (n->nobj) {
491 	case LE: case LT: case EQ: case NE: case GT: case GE:
492 	case BOR: case AND: case NOT:
493 		return n;
494 	default:
495 		return op2(NE, n, nullnode);
496 	}
497 }
498 
499 void checkdup(Node *vl, Cell *cp)	/* check if name already in list */
500 {
501 	char *s = cp->nval;
502 	for ( ; vl; vl = vl->nnext) {
503 		if (strcmp(s, ((Cell *)(vl->narg[0]))->nval) == 0) {
504 			SYNTAX("duplicate argument %s", s);
505 			break;
506 		}
507 	}
508 }
509