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);
yywrap(void)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 { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); free($3); }
208 | ppattern MATCHOP ppattern
209 { if (constnode($3)) {
210 $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
211 free($3);
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 { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); free($3); }
236 | pattern MATCHOP pattern
237 { if (constnode($3)) {
238 $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
239 free($3);
240 } else
241 $$ = op3($2, (Node *)1, $1, $3); }
242 | pattern IN varname { $$ = op2(INTEST, $1, makearr($3)); }
243 | '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); }
244 | pattern '|' GETLINE var {
245 if (safe) SYNTAX("cmd | getline is unsafe");
246 else $$ = op3(GETLINE, $4, itonp($2), $1); }
247 | pattern '|' GETLINE {
248 if (safe) SYNTAX("cmd | getline is unsafe");
249 else $$ = op3(GETLINE, (Node*)0, itonp($2), $1); }
250 | pattern term %prec CAT { $$ = op2(CAT, $1, $2); }
251 | re
252 | term
253 ;
254
255 plist:
256 pattern comma pattern { $$ = linkum($1, $3); }
257 | plist comma pattern { $$ = linkum($1, $3); }
258 ;
259
260 pplist:
261 ppattern
262 | pplist comma ppattern { $$ = linkum($1, $3); }
263 ;
264
265 prarg:
266 /* empty */ { $$ = rectonode(); }
267 | pplist
268 | '(' plist ')' { $$ = $2; }
269 ;
270
271 print:
272 PRINT | PRINTF
273 ;
274
275 pst:
276 NL | ';' | pst NL | pst ';'
277 ;
278
279 rbrace:
280 '}' | rbrace NL
281 ;
282
283 re:
284 reg_expr
285 { $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); free($1); }
286 | NOT re { $$ = op1(NOT, notnull($2)); }
287 ;
288
289 reg_expr:
290 '/' {startreg();} REGEXPR '/' { $$ = $3; }
291 ;
292
293 rparen:
294 ')' | rparen NL
295 ;
296
297 simple_stmt:
298 print prarg '|' term {
299 if (safe) SYNTAX("print | is unsafe");
300 else $$ = stat3($1, $2, itonp($3), $4); }
301 | print prarg APPEND term {
302 if (safe) SYNTAX("print >> is unsafe");
303 else $$ = stat3($1, $2, itonp($3), $4); }
304 | print prarg GT term {
305 if (safe) SYNTAX("print > is unsafe");
306 else $$ = stat3($1, $2, itonp($3), $4); }
307 | print prarg { $$ = stat3($1, $2, NIL, NIL); }
308 | DELETE varname '[' patlist ']' { $$ = stat2(DELETE, makearr($2), $4); }
309 | DELETE varname { $$ = stat2(DELETE, makearr($2), 0); }
310 | pattern { $$ = exptostat($1); }
311 | error { yyclearin; SYNTAX("illegal statement"); }
312 ;
313
314 st:
315 nl
316 | ';' opt_nl
317 ;
318
319 stmt:
320 BREAK st { if (!inloop) SYNTAX("break illegal outside of loops");
321 $$ = stat1(BREAK, NIL); }
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 string:
355 STRING
356 | string STRING { $$ = catstr($1, $2); }
357 ;
358
359 term:
360 term '/' ASGNOP term { $$ = op2(DIVEQ, $1, $4); }
361 | term '+' term { $$ = op2(ADD, $1, $3); }
362 | term '-' term { $$ = op2(MINUS, $1, $3); }
363 | term '*' term { $$ = op2(MULT, $1, $3); }
364 | term '/' term { $$ = op2(DIVIDE, $1, $3); }
365 | term '%' term { $$ = op2(MOD, $1, $3); }
366 | term POWER term { $$ = op2(POWER, $1, $3); }
367 | '-' term %prec UMINUS { $$ = op1(UMINUS, $2); }
368 | '+' term %prec UMINUS { $$ = op1(UPLUS, $2); }
369 | NOT term %prec UMINUS { $$ = op1(NOT, notnull($2)); }
370 | BLTIN '(' ')' { $$ = op2(BLTIN, itonp($1), rectonode()); }
371 | BLTIN '(' patlist ')' { $$ = op2(BLTIN, itonp($1), $3); }
372 | BLTIN { $$ = op2(BLTIN, itonp($1), rectonode()); }
373 | CALL '(' ')' { $$ = op2(CALL, celltonode($1,CVAR), NIL); }
374 | CALL '(' patlist ')' { $$ = op2(CALL, celltonode($1,CVAR), $3); }
375 | CLOSE term { $$ = op1(CLOSE, $2); }
376 | DECR var { $$ = op1(PREDECR, $2); }
377 | INCR var { $$ = op1(PREINCR, $2); }
378 | var DECR { $$ = op1(POSTDECR, $1); }
379 | var INCR { $$ = op1(POSTINCR, $1); }
380 | GENSUB '(' reg_expr comma pattern comma pattern ')'
381 { $$ = op5(GENSUB, NIL, (Node*)makedfa($3, 1), $5, $7, rectonode()); }
382 | GENSUB '(' pattern comma pattern comma pattern ')'
383 { if (constnode($3)) {
384 $$ = op5(GENSUB, NIL, (Node *)makedfa(strnode($3), 1), $5, $7, rectonode());
385 free($3);
386 } else
387 $$ = op5(GENSUB, (Node *)1, $3, $5, $7, rectonode());
388 }
389 | GENSUB '(' reg_expr comma pattern comma pattern comma pattern ')'
390 { $$ = op5(GENSUB, NIL, (Node*)makedfa($3, 1), $5, $7, $9); }
391 | GENSUB '(' pattern comma pattern comma pattern comma pattern ')'
392 { if (constnode($3)) {
393 $$ = op5(GENSUB, NIL, (Node *)makedfa(strnode($3),1), $5,$7,$9);
394 free($3);
395 } else
396 $$ = op5(GENSUB, (Node *)1, $3, $5, $7, $9);
397 }
398 | GETLINE var LT term { $$ = op3(GETLINE, $2, itonp($3), $4); }
399 | GETLINE LT term { $$ = op3(GETLINE, NIL, itonp($2), $3); }
400 | GETLINE var { $$ = op3(GETLINE, $2, NIL, NIL); }
401 | GETLINE { $$ = op3(GETLINE, NIL, NIL, NIL); }
402 | INDEX '(' pattern comma pattern ')'
403 { $$ = op2(INDEX, $3, $5); }
404 | INDEX '(' pattern comma reg_expr ')'
405 { SYNTAX("index() doesn't permit regular expressions");
406 $$ = op2(INDEX, $3, (Node*)$5); }
407 | '(' pattern ')' { $$ = $2; }
408 | MATCHFCN '(' pattern comma reg_expr ')'
409 { $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa($5, 1)); free($5); }
410 | MATCHFCN '(' pattern comma pattern ')'
411 { if (constnode($5)) {
412 $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1));
413 free($5);
414 } else
415 $$ = op3(MATCHFCN, (Node *)1, $3, $5); }
416 | NUMBER { $$ = celltonode($1, CCON); }
417 | SPLIT '(' pattern comma varname comma pattern ')' /* string */
418 { $$ = op4(SPLIT, $3, makearr($5), $7, (Node*)STRING); }
419 | SPLIT '(' pattern comma varname comma reg_expr ')' /* const /regexp/ */
420 { $$ = op4(SPLIT, $3, makearr($5), (Node*)makedfa($7, 1), (Node *)REGEXPR); free($7); }
421 | SPLIT '(' pattern comma varname ')'
422 { $$ = op4(SPLIT, $3, makearr($5), NIL, (Node*)STRING); } /* default */
423 | SPRINTF '(' patlist ')' { $$ = op1($1, $3); }
424 | string { $$ = celltonode($1, CCON); }
425 | subop '(' reg_expr comma pattern ')'
426 { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); free($3); }
427 | subop '(' pattern comma pattern ')'
428 { if (constnode($3)) {
429 $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode());
430 free($3);
431 } else
432 $$ = op4($1, (Node *)1, $3, $5, rectonode()); }
433 | subop '(' reg_expr comma pattern comma var ')'
434 { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, $7); free($3); }
435 | subop '(' pattern comma pattern comma var ')'
436 { if (constnode($3)) {
437 $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7);
438 free($3);
439 } else
440 $$ = op4($1, (Node *)1, $3, $5, $7); }
441 | SUBSTR '(' pattern comma pattern comma pattern ')'
442 { $$ = op3(SUBSTR, $3, $5, $7); }
443 | SUBSTR '(' pattern comma pattern ')'
444 { $$ = op3(SUBSTR, $3, $5, NIL); }
445 | var
446 ;
447
448 var:
449 varname
450 | varname '[' patlist ']' { $$ = op2(ARRAY, makearr($1), $3); }
451 | IVAR { $$ = op1(INDIRECT, celltonode($1, CVAR)); }
452 | INDIRECT term { $$ = op1(INDIRECT, $2); }
453 ;
454
455 varlist:
456 /* nothing */ { arglist = $$ = 0; }
457 | VAR { arglist = $$ = celltonode($1,CVAR); }
458 | varlist comma VAR {
459 checkdup($1, $3);
460 arglist = $$ = linkum($1,celltonode($3,CVAR)); }
461 ;
462
463 varname:
464 VAR { $$ = celltonode($1, CVAR); }
465 | ARG { $$ = op1(ARG, itonp($1)); }
466 | VARNF { $$ = op1(VARNF, (Node *) $1); }
467 ;
468
469
470 while:
471 WHILE '(' pattern rparen { $$ = notnull($3); }
472 ;
473
474 %%
475
476 void setfname(Cell *p)
477 {
478 if (isarr(p))
479 SYNTAX("%s is an array, not a function", p->nval);
480 else if (isfcn(p))
481 SYNTAX("you can't define function %s more than once", p->nval);
482 curfname = p->nval;
483 }
484
485 int constnode(Node *p)
486 {
487 return isvalue(p) && ((Cell *) (p->narg[0]))->csub == CCON;
488 }
489
490 char *strnode(Node *p)
491 {
492 return ((Cell *)(p->narg[0]))->sval;
493 }
494
495 Node *notnull(Node *n)
496 {
497 switch (n->nobj) {
498 case LE: case LT: case EQ: case NE: case GT: case GE:
499 case BOR: case AND: case NOT:
500 return n;
501 default:
502 return op2(NE, n, nullnode);
503 }
504 }
505
506 void checkdup(Node *vl, Cell *cp) /* check if name already in list */
507 {
508 char *s = cp->nval;
509 for ( ; vl; vl = vl->nnext) {
510 if (strcmp(s, ((Cell *)(vl->narg[0]))->nval) == 0) {
511 SYNTAX("duplicate argument %s", s);
512 break;
513 }
514 }
515 }
516