summaryrefslogtreecommitdiff
path: root/usr.bin/awk/awkgram.y
blob: bd751e3e8f7cda6a8259c104c2c824d1982ea02c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
/*	$OpenBSD: awkgram.y,v 1.4 1997/08/25 16:17:09 kstailey Exp $	*/
/****************************************************************
Copyright (C) Lucent Technologies 1997
All Rights Reserved

Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name Lucent Technologies or any of
its entities not be used in advertising or publicity pertaining
to distribution of the software without specific, written prior
permission.

LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
****************************************************************/

%{
#include <stdio.h>
#include <string.h>
#include "awk.h"

void checkdup(Node *list, Cell *item);
int yywrap(void) { return(1); }

Node	*beginloc = 0;
Node	*endloc = 0;
int	infunc	= 0;	/* = 1 if in arglist or body of func */
int	inloop	= 0;	/* = 1 if in while, for, do */
char	*curfname = 0;	/* current function name */
Node	*arglist = 0;	/* list of args for current function */
%}

%union {
	Node	*p;
	Cell	*cp;
	int	i;
	char	*s;
}

%token	<i>	FIRSTTOKEN	/* must be first */
%token	<p>	PROGRAM PASTAT PASTAT2 XBEGIN XEND
%token	<i>	NL ',' '{' '(' '|' ';' '/' ')' '}' '[' ']'
%token	<i>	ARRAY
%token	<i>	MATCH NOTMATCH MATCHOP
%token	<i>	FINAL DOT ALL CCL NCCL CHAR OR STAR QUEST PLUS
%token	<i>	AND BOR APPEND EQ GE GT LE LT NE IN
%token	<i>	ARG BLTIN BREAK CLOSE CONTINUE DELETE DO EXIT FOR FUNC 
%token	<i>	SUB GSUB IF INDEX LSUBSTR MATCHFCN NEXT NEXTFILE
%token	<i>	ADD MINUS MULT DIVIDE MOD
%token	<i>	ASSIGN ASGNOP ADDEQ SUBEQ MULTEQ DIVEQ MODEQ POWEQ
%token	<i>	PRINT PRINTF SPRINTF
%token	<p>	ELSE INTEST CONDEXPR
%token	<i>	POSTINCR PREINCR POSTDECR PREDECR
%token	<cp>	VAR IVAR VARNF CALL NUMBER STRING
%token	<s>	REGEXPR

%type	<p>	pas pattern ppattern plist pplist patlist prarg term re
%type	<p>	pa_pat pa_stat pa_stats
%type	<s>	reg_expr
%type	<p>	simple_stmt opt_simple_stmt stmt stmtlist
%type	<p>	var varname funcname varlist
%type	<p>	for if else while
%type	<i>	do st
%type	<i>	pst opt_pst lbrace rbrace rparen comma nl opt_nl and bor
%type	<i>	subop print

%right	ASGNOP
%right	'?'
%right	':'
%left	BOR
%left	AND
%left	GETLINE
%nonassoc APPEND EQ GE GT LE LT NE MATCHOP IN '|'
%left	ARG BLTIN BREAK CALL CLOSE CONTINUE DELETE DO EXIT FOR FUNC 
%left	GSUB IF INDEX LSUBSTR MATCHFCN NEXT NUMBER
%left	PRINT PRINTF RETURN SPLIT SPRINTF STRING SUB SUBSTR
%left	REGEXPR VAR VARNF IVAR WHILE '('
%left	CAT
%left	'+' '-'
%left	'*' '/' '%'
%left	NOT UMINUS
%right	POWER
%right	DECR INCR
%left	INDIRECT
%token	LASTTOKEN	/* must be last */

%%

program:
	  pas	{ if (errorflag==0)
			winner = (Node *)stat3(PROGRAM, beginloc, $1, endloc); }
	| error	{ yyclearin; bracecheck(); ERROR "bailing out" SYNTAX; }
	;

and:
	  AND | and NL
	;

bor:
	  BOR | bor NL
	;

comma:
	  ',' | comma NL
	;

do:
	  DO | do NL
	;

else:
	  ELSE | else NL
	;

for:
	  FOR '(' opt_simple_stmt ';' opt_nl pattern ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
		{ --inloop; $$ = stat4(FOR, $3, notnull($6), $9, $12); }
	| FOR '(' opt_simple_stmt ';'  ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt
		{ --inloop; $$ = stat4(FOR, $3, NIL, $7, $10); }
	| FOR '(' varname IN varname rparen {inloop++;} stmt
		{ --inloop; $$ = stat3(IN, $3, makearr($5), $8); }
	;

funcname:
	  VAR	{ setfname($1); }
	| CALL	{ setfname($1); }
	;

if:
	  IF '(' pattern rparen		{ $$ = notnull($3); }
	;

lbrace:
	  '{' | lbrace NL
	;

nl:
	  NL | nl NL
	;

opt_nl:
	  /* empty */	{ $$ = 0; }
	| nl
	;

opt_pst:
	  /* empty */	{ $$ = 0; }
	| pst
	;


opt_simple_stmt:
	  /* empty */			{ $$ = 0; }
	| simple_stmt
	;

pas:
	  opt_pst			{ $$ = 0; }
	| opt_pst pa_stats opt_pst	{ $$ = $2; }
	;

pa_pat:
	  pattern	{ $$ = notnull($1); }
	;

pa_stat:
	  pa_pat			{ $$ = stat2(PASTAT, $1, stat2(PRINT, rectonode(), NIL)); }
	| pa_pat lbrace stmtlist '}'	{ $$ = stat2(PASTAT, $1, $3); }
	| pa_pat ',' pa_pat		{ $$ = pa2stat($1, $3, stat2(PRINT, rectonode(), NIL)); }
	| pa_pat ',' pa_pat lbrace stmtlist '}'	{ $$ = pa2stat($1, $3, $5); }
	| lbrace stmtlist '}'		{ $$ = stat2(PASTAT, NIL, $2); }
	| XBEGIN lbrace stmtlist '}'
		{ beginloc = linkum(beginloc, $3); $$ = 0; }
	| XEND lbrace stmtlist '}'
		{ endloc = linkum(endloc, $3); $$ = 0; }
	| FUNC funcname '(' varlist rparen {infunc++;} lbrace stmtlist '}'
		{ infunc--; curfname=0; defn((Cell *)$2, $4, $8); $$ = 0; }
	;

pa_stats:
	  pa_stat
	| pa_stats opt_pst pa_stat	{ $$ = linkum($1, $3); }
	;

patlist:
	  pattern
	| patlist comma pattern		{ $$ = linkum($1, $3); }
	;

ppattern:
	  var ASGNOP ppattern		{ $$ = op2($2, $1, $3); }
	| ppattern '?' ppattern ':' ppattern %prec '?'
	 	{ $$ = op3(CONDEXPR, notnull($1), $3, $5); }
	| ppattern bor ppattern %prec BOR
		{ $$ = op2(BOR, notnull($1), notnull($3)); }
	| ppattern and ppattern %prec AND
		{ $$ = op2(AND, notnull($1), notnull($3)); }
	| ppattern MATCHOP reg_expr	{ $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
	| ppattern MATCHOP ppattern
		{ if (constnode($3))
			$$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
		  else
			$$ = op3($2, (Node *)1, $1, $3); }
	| ppattern IN varname		{ $$ = op2(INTEST, $1, makearr($3)); }
	| '(' plist ')' IN varname	{ $$ = op2(INTEST, $2, makearr($5)); }
	| ppattern term %prec CAT	{ $$ = op2(CAT, $1, $2); }
	| re
	| term
	;

pattern:
	  var ASGNOP pattern		{ $$ = op2($2, $1, $3); }
	| pattern '?' pattern ':' pattern %prec '?'
	 	{ $$ = op3(CONDEXPR, notnull($1), $3, $5); }
	| pattern bor pattern %prec BOR
		{ $$ = op2(BOR, notnull($1), notnull($3)); }
	| pattern and pattern %prec AND
		{ $$ = op2(AND, notnull($1), notnull($3)); }
	| pattern EQ pattern		{ $$ = op2($2, $1, $3); }
	| pattern GE pattern		{ $$ = op2($2, $1, $3); }
	| pattern GT pattern		{ $$ = op2($2, $1, $3); }
	| pattern LE pattern		{ $$ = op2($2, $1, $3); }
	| pattern LT pattern		{ $$ = op2($2, $1, $3); }
	| pattern NE pattern		{ $$ = op2($2, $1, $3); }
	| pattern MATCHOP reg_expr	{ $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
	| pattern MATCHOP pattern
		{ if (constnode($3))
			$$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
		  else
			$$ = op3($2, (Node *)1, $1, $3); }
	| pattern IN varname		{ $$ = op2(INTEST, $1, makearr($3)); }
	| '(' plist ')' IN varname	{ $$ = op2(INTEST, $2, makearr($5)); }
	| pattern '|' GETLINE var	{ 
			if (safe) ERROR "cmd | getline is unsafe" SYNTAX;
			else $$ = op3(GETLINE, $4, (Node*)$2, $1); }
	| pattern '|' GETLINE		{ 
			if (safe) ERROR "cmd | getline is unsafe" SYNTAX;
			else $$ = op3(GETLINE, (Node*)0, (Node*)$2, $1); }
	| pattern term %prec CAT	{ $$ = op2(CAT, $1, $2); }
	| re
	| term
	;

plist:
	  pattern comma pattern		{ $$ = linkum($1, $3); }
	| plist comma pattern		{ $$ = linkum($1, $3); }
	;

pplist:
	  ppattern
	| pplist comma ppattern		{ $$ = linkum($1, $3); }
	;

prarg:
	  /* empty */			{ $$ = rectonode(); }
	| pplist
	| '(' plist ')'			{ $$ = $2; }
	;

print:
	  PRINT | PRINTF
	;

pst:
	  NL | ';' | pst NL | pst ';'
	;

rbrace:
	  '}' | rbrace NL
	;

re:
	   reg_expr
		{ $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); }
	| NOT re	{ $$ = op1(NOT, notnull($2)); }
	;

reg_expr:
	  '/' {startreg();} REGEXPR '/'		{ $$ = $3; }
	;

rparen:
	  ')' | rparen NL
	;

simple_stmt:
	  print prarg '|' term		{ 
			if (safe) ERROR "print | is unsafe" SYNTAX;
			else $$ = stat3($1, $2, (Node *) $3, $4); }
	| print prarg APPEND term	{
			if (safe) ERROR "print >> is unsafe" SYNTAX;
			else $$ = stat3($1, $2, (Node *) $3, $4); }
	| print prarg GT term		{
			if (safe) ERROR "print > is unsafe" SYNTAX;
			else $$ = stat3($1, $2, (Node *) $3, $4); }
	| print prarg			{ $$ = stat3($1, $2, NIL, NIL); }
	| DELETE varname '[' patlist ']' { $$ = stat2(DELETE, makearr($2), $4); }
	| DELETE varname		 { $$ = stat2(DELETE, makearr($2), 0); }
	| pattern			{ $$ = exptostat($1); }
	| error				{ yyclearin; ERROR "illegal statement" SYNTAX; }
	;

st:
	  nl
	| ';' opt_nl
	;

stmt:
	  BREAK st		{ if (!inloop) ERROR "break illegal outside of loops" SYNTAX;
				  $$ = stat1(BREAK, NIL); }
	| CLOSE pattern st	{ $$ = stat1(CLOSE, $2); }
	| CONTINUE st		{  if (!inloop) ERROR "continue illegal outside of loops" SYNTAX;
				  $$ = stat1(CONTINUE, NIL); }
	| do {inloop++;} stmt {--inloop;} WHILE '(' pattern ')' st
		{ $$ = stat2(DO, $3, notnull($7)); }
	| EXIT pattern st	{ $$ = stat1(EXIT, $2); }
	| EXIT st		{ $$ = stat1(EXIT, NIL); }
	| for
	| if stmt else stmt	{ $$ = stat3(IF, $1, $2, $4); }
	| if stmt		{ $$ = stat3(IF, $1, $2, NIL); }
	| lbrace stmtlist rbrace { $$ = $2; }
	| NEXT st	{ if (infunc)
				ERROR "next is illegal inside a function" SYNTAX;
			  $$ = stat1(NEXT, NIL); }
	| NEXTFILE st	{ if (infunc)
				ERROR "nextfile is illegal inside a function" SYNTAX;
			  $$ = stat1(NEXTFILE, NIL); }
	| RETURN pattern st	{ $$ = stat1(RETURN, $2); }
	| RETURN st		{ $$ = stat1(RETURN, NIL); }
	| simple_stmt st
	| while {inloop++;} stmt	{ --inloop; $$ = stat2(WHILE, $1, $3); }
	| ';' opt_nl		{ $$ = 0; }
	;

stmtlist:
	  stmt
	| stmtlist stmt		{ $$ = linkum($1, $2); }
	;

subop:
	  SUB | GSUB
	;

term:
	  term '+' term			{ $$ = op2(ADD, $1, $3); }
	| term '-' term			{ $$ = op2(MINUS, $1, $3); }
	| term '*' term			{ $$ = op2(MULT, $1, $3); }
	| term '/' term			{ $$ = op2(DIVIDE, $1, $3); }
	| term '%' term			{ $$ = op2(MOD, $1, $3); }
	| term POWER term		{ $$ = op2(POWER, $1, $3); }
	| '-' term %prec UMINUS		{ $$ = op1(UMINUS, $2); }
	| '+' term %prec UMINUS		{ $$ = $2; }
	| NOT term %prec UMINUS		{ $$ = op1(NOT, notnull($2)); }
	| BLTIN '(' ')'			{ $$ = op2(BLTIN, (Node *) $1, rectonode()); }
	| BLTIN '(' patlist ')'		{ $$ = op2(BLTIN, (Node *) $1, $3); }
	| BLTIN				{ $$ = op2(BLTIN, (Node *) $1, rectonode()); }
	| CALL '(' ')'			{ $$ = op2(CALL, celltonode($1,CVAR), NIL); }
	| CALL '(' patlist ')'		{ $$ = op2(CALL, celltonode($1,CVAR), $3); }
	| DECR var			{ $$ = op1(PREDECR, $2); }
	| INCR var			{ $$ = op1(PREINCR, $2); }
	| var DECR			{ $$ = op1(POSTDECR, $1); }
	| var INCR			{ $$ = op1(POSTINCR, $1); }
	| GETLINE var LT term		{ $$ = op3(GETLINE, $2, (Node *)$3, $4); }
	| GETLINE LT term		{ $$ = op3(GETLINE, NIL, (Node *)$2, $3); }
	| GETLINE var			{ $$ = op3(GETLINE, $2, NIL, NIL); }
	| GETLINE			{ $$ = op3(GETLINE, NIL, NIL, NIL); }
	| INDEX '(' pattern comma pattern ')'
		{ $$ = op2(INDEX, $3, $5); }
	| INDEX '(' pattern comma reg_expr ')'
		{ ERROR "index() doesn't permit regular expressions" SYNTAX;
		  $$ = op2(INDEX, $3, (Node*)$5); }
	| '(' pattern ')'		{ $$ = $2; }
	| MATCHFCN '(' pattern comma reg_expr ')'
		{ $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa($5, 1)); }
	| MATCHFCN '(' pattern comma pattern ')'
		{ if (constnode($5))
			$$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1));
		  else
			$$ = op3(MATCHFCN, (Node *)1, $3, $5); }
	| NUMBER			{ $$ = celltonode($1, CCON); }
	| SPLIT '(' pattern comma varname comma pattern ')'     /* string */
		{ $$ = op4(SPLIT, $3, makearr($5), $7, (Node*)STRING); }
	| SPLIT '(' pattern comma varname comma reg_expr ')'    /* const /regexp/ */
		{ $$ = op4(SPLIT, $3, makearr($5), (Node*)makedfa($7, 1), (Node *)REGEXPR); }
	| SPLIT '(' pattern comma varname ')'
		{ $$ = op4(SPLIT, $3, makearr($5), NIL, (Node*)STRING); }  /* default */
	| SPRINTF '(' patlist ')'	{ $$ = op1($1, $3); }
	| STRING	 		{ $$ = celltonode($1, CCON); }
	| subop '(' reg_expr comma pattern ')'
		{ $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); }
	| subop '(' pattern comma pattern ')'
		{ if (constnode($3))
			$$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode());
		  else
			$$ = op4($1, (Node *)1, $3, $5, rectonode()); }
	| subop '(' reg_expr comma pattern comma var ')'
		{ $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, $7); }
	| subop '(' pattern comma pattern comma var ')'
		{ if (constnode($3))
			$$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7);
		  else
			$$ = op4($1, (Node *)1, $3, $5, $7); }
	| SUBSTR '(' pattern comma pattern comma pattern ')'
		{ $$ = op3(SUBSTR, $3, $5, $7); }
	| SUBSTR '(' pattern comma pattern ')'
		{ $$ = op3(SUBSTR, $3, $5, NIL); }
	| var
	;

var:
	  varname
	| varname '[' patlist ']'	{ $$ = op2(ARRAY, makearr($1), $3); }
	| IVAR				{ $$ = op1(INDIRECT, celltonode($1, CVAR)); }
	| INDIRECT term	 		{ $$ = op1(INDIRECT, $2); }
	;	

varlist:
	  /* nothing */		{ arglist = $$ = 0; }
	| VAR			{ arglist = $$ = celltonode($1,CVAR); }
	| varlist comma VAR	{
			checkdup($1, $3);
			arglist = $$ = linkum($1,celltonode($3,CVAR)); }
	;

varname:
	  VAR			{ $$ = celltonode($1, CVAR); }
	| ARG 			{ $$ = op1(ARG, (Node *) $1); }
	| VARNF			{ $$ = op1(VARNF, (Node *) $1); }
	;


while:
	  WHILE '(' pattern rparen	{ $$ = notnull($3); }
	;

%%

void setfname(Cell *p)
{
	if (isarr(p))
		ERROR "%s is an array, not a function", p->nval SYNTAX;
	else if (isfcn(p))
		ERROR "you can't define function %s more than once", p->nval SYNTAX;
	curfname = p->nval;
}

int constnode(Node *p)
{
	return isvalue(p) && ((Cell *) (p->narg[0]))->csub == CCON;
}

char *strnode(Node *p)
{
	return ((Cell *)(p->narg[0]))->sval;
}

Node *notnull(Node *n)
{
	switch (n->nobj) {
	case LE: case LT: case EQ: case NE: case GT: case GE:
	case BOR: case AND: case NOT:
		return n;
	default:
		return op2(NE, n, nullnode);
	}
}

void checkdup(Node *vl, Cell *cp)	/* check if name already in list */
{
	char *s = cp->nval;
	for ( ; vl; vl = vl->nnext) {
		if (strcmp(s, ((Cell *)(vl->narg[0]))->nval) == 0) {
			ERROR "duplicate argument %s", s SYNTAX;
			break;
		}
	}
}