1 /****************************************************************
2 Copyright (C) Lucent Technologies 1997
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
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
23 ****************************************************************/
30 void checkdup(Node *list, Cell *item);
31 int yywrap(void) { return(1); }
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 */
48 %token <i> FIRSTTOKEN /* must be first */
49 %token <p> PROGRAM PASTAT PASTAT2 XBEGIN XEND
50 %token <i> NL ',' '{' '(' '|' ';' '/' ')' '}' '[' ']'
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
65 %type <p> pas pattern ppattern plist pplist patlist prarg term re
66 %type <p> pa_pat pa_stat pa_stats
68 %type <p> simple_stmt opt_simple_stmt stmt stmtlist
69 %type <p> var varname funcname varlist
70 %type <p> for if else while
72 %type <i> pst opt_pst lbrace rbrace rparen comma nl opt_nl and bor
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 '('
90 %left NOT UMINUS UPLUS
94 %token LASTTOKEN /* must be last */
99 pas { if (errorflag==0)
100 winner = (Node *)stat3(PROGRAM, beginloc, $1, endloc); }
101 | error { yyclearin; bracecheck(); SYNTAX("bailing out"); }
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; $$ = stat3(IN, $3, makearr($5), $8); }
134 VAR { setfname($1); }
135 | CALL { setfname($1); }
139 IF '(' pattern rparen { $$ = notnull($3); }
151 /* empty */ { $$ = 0; }
156 /* empty */ { $$ = 0; }
162 /* empty */ { $$ = 0; }
168 | opt_pst pa_stats opt_pst { $$ = $2; }
172 pattern { $$ = notnull($1); }
176 pa_pat { $$ = 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); $$ = 0; }
191 | pa_stats opt_pst pa_stat { $$ = linkum($1, $3); }
196 | patlist comma pattern { $$ = linkum($1, $3); }
200 var ASGNOP ppattern { $$ = 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
210 $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
212 $$ = 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 { $$ = op2(CAT, $1, $2); }
221 var ASGNOP pattern { $$ = 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
237 $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
239 $$ = 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 { $$ = op2(CAT, $1, $2); }
254 pattern comma pattern { $$ = linkum($1, $3); }
255 | plist comma pattern { $$ = linkum($1, $3); }
260 | pplist comma ppattern { $$ = linkum($1, $3); }
264 /* empty */ { $$ = rectonode(); }
266 | '(' plist ')' { $$ = $2; }
274 NL | ';' | pst NL | pst ';'
283 { $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); }
284 | NOT re { $$ = op1(NOT, notnull($2)); }
288 '/' {startreg();} REGEXPR '/' { $$ = $3; }
296 print prarg '|' term {
297 if (safe) SYNTAX("print | is unsafe");
298 else $$ = 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"); }
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 { $$ = stat1(EXIT, NIL); }
327 | if stmt else stmt { $$ = 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); }
339 | while {inloop++;} stmt { --inloop; $$ = stat2(WHILE, $1, $3); }
340 | ';' opt_nl { $$ = 0; }
345 | stmtlist stmt { $$ = linkum($1, $2); }
354 | string STRING { $$ = catstr($1, $2); }
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 { $$ = op5(GENSUB, NIL, (Node*)makedfa($3, 1), $5, $7, rectonode()); }
380 | GENSUB '(' pattern comma pattern comma pattern ')'
382 $$ = op5(GENSUB, NIL, (Node *)makedfa(strnode($3), 1), $5, $7, rectonode());
384 $$ = op5(GENSUB, (Node *)1, $3, $5, $7, rectonode());
386 | GENSUB '(' reg_expr comma pattern comma pattern comma pattern ')'
387 { $$ = op5(GENSUB, NIL, (Node*)makedfa($3, 1), $5, $7, $9); }
388 | GENSUB '(' pattern comma pattern comma pattern comma pattern ')'
390 $$ = op5(GENSUB, NIL, (Node *)makedfa(strnode($3),1), $5,$7,$9);
392 $$ = op5(GENSUB, (Node *)1, $3, $5, $7, $9);
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 ')'
408 $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1));
410 $$ = 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 { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); }
422 | subop '(' pattern comma pattern ')'
424 $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode());
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 ')'
431 $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7);
433 $$ = 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); }
443 | varname '[' patlist ']' { $$ = op2(ARRAY, makearr($1), $3); }
444 | IVAR { $$ = op1(INDIRECT, celltonode($1, CVAR)); }
445 | INDIRECT term { $$ = op1(INDIRECT, $2); }
449 /* nothing */ { arglist = $$ = 0; }
450 | VAR { arglist = $$ = celltonode($1,CVAR); }
451 | varlist comma VAR {
453 arglist = $$ = linkum($1,celltonode($3,CVAR)); }
457 VAR { $$ = celltonode($1, CVAR); }
458 | ARG { $$ = op1(ARG, itonp($1)); }
459 | VARNF { $$ = op1(VARNF, (Node *) $1); }
464 WHILE '(' pattern rparen { $$ = notnull($3); }
469 void setfname(Cell *p)
472 SYNTAX("%s is an array, not a function", p->nval);
474 SYNTAX("you can't define function %s more than once", p->nval);
478 int constnode(Node *p)
480 return isvalue(p) && ((Cell *) (p->narg[0]))->csub == CCON;
483 char *strnode(Node *p)
485 return ((Cell *)(p->narg[0]))->sval;
488 Node *notnull(Node *n)
491 case LE: case LT: case EQ: case NE: case GT: case GE:
492 case BOR: case AND: case NOT:
495 return op2(NE, n, nullnode);
499 void checkdup(Node *vl, Cell *cp) /* check if name already in list */
502 for ( ; vl; vl = vl->nnext) {
503 if (strcmp(s, ((Cell *)(vl->narg[0]))->nval) == 0) {
504 SYNTAX("duplicate argument %s", s);