3 * Copyright (c) 1991-1994, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
11 * 'I see,' laughed Strider. 'I look foul and feel fair. Is that it?
12 * All that is gold does not glitter, not all those that wander are lost.'
22 deprecate("\"do\" to call subroutines");
38 %token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF
39 %token <opval> FUNC0SUB UNIOPSUB LSTOPSUB
41 %token <ival> FORMAT SUB ANONSUB PACKAGE USE
42 %token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
43 %token <ival> LOOPEX DOTDOT
44 %token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
45 %token <ival> RELOP EQOP MULOP ADDOP
46 %token <ival> DOLSHARP DO HASHBRACK NOAMP
49 %type <ival> prog decl local format startsub remember mremember '&'
50 %type <opval> block mblock lineseq line loop cond else
51 %type <opval> expr term scalar ary hsh arylen star amper sideff
52 %type <opval> argexpr nexpr texpr iexpr mexpr mnexpr mtexpr miexpr
53 %type <opval> listexpr listexprcom indirob
54 %type <opval> listop method proto cont my_scalar
60 %nonassoc LSTOP LSTOPSUB
62 %right <ival> ASSIGNOP
71 %nonassoc UNIOP UNIOPSUB
76 %right '!' '~' UMINUS REFGEN
78 %nonassoc PREINC PREDEC POSTINC POSTDEC
86 #if defined(YYDEBUG) && defined(DEBUGGING)
87 yydebug = (debug & 1);
95 block : '{' remember lineseq '}'
96 { if (copline > (line_t)$1)
98 $$ = block_end($2, $3); }
101 remember: /* NULL */ /* start a full lexical scope */
102 { $$ = block_start(TRUE); }
105 mblock : '{' mremember lineseq '}'
106 { if (copline > (line_t)$1)
108 $$ = block_end($2, $3); }
111 mremember: /* NULL */ /* start a partial lexical scope */
112 { $$ = block_start(FALSE); }
120 { $$ = append_list(OP_LINESEQ,
121 (LISTOP*)$1, (LISTOP*)$2);
122 pad_reset_pending = TRUE;
123 if ($1 && $2) hints |= HINT_BLOCK_SCOPE; }
127 { $$ = newSTATEOP(0, $1, $2); }
128 | loop /* loops add their own labels */
130 { if ($1 != Nullch) {
131 $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0));
139 { $$ = newSTATEOP(0, $1, $2);
148 { $$ = newLOGOP(OP_AND, 0, $3, $1); }
150 { $$ = newLOGOP(OP_OR, 0, $3, $1); }
152 { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); }
154 { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);}
161 | ELSIF '(' mexpr ')' mblock else
163 $$ = newSTATEOP(0, Nullch,
164 newCONDOP(0, $3, scope($5), $6));
165 hints |= HINT_BLOCK_SCOPE; }
168 cond : IF '(' remember mexpr ')' mblock else
171 newCONDOP(0, $4, scope($6), $7)); }
172 | UNLESS '(' remember miexpr ')' mblock else
175 newCONDOP(0, $4, scope($6), $7)); }
184 loop : label WHILE '(' remember mtexpr ')' mblock cont
188 newWHILEOP(0, 1, (LOOP*)Nullop,
190 | label UNTIL '(' remember miexpr ')' mblock cont
194 newWHILEOP(0, 1, (LOOP*)Nullop,
196 | label FOR MY remember my_scalar '(' mexpr ')' mblock cont
198 newFOROP(0, $1, $2, $5, $7, $9, $10)); }
199 | label FOR scalar '(' remember mexpr ')' mblock cont
201 newFOROP(0, $1, $2, mod($3, OP_ENTERLOOP),
203 | label FOR '(' remember mexpr ')' mblock cont
205 newFOROP(0, $1, $2, Nullop, $5, $7, $8)); }
206 | label FOR '(' remember mnexpr ';' mtexpr ';' mnexpr ')' mblock
207 /* basically fake up an initialize-while lineseq */
210 append_elem(OP_LINESEQ, scalar($5),
212 newWHILEOP(0, 1, (LOOP*)Nullop,
214 $11, scalar($9))))); }
215 | label block cont /* a block is a loop that happens once */
217 $1, newWHILEOP(0, 1, (LOOP*)Nullop,
226 texpr : /* NULL means true */
227 { (void)scan_num("1"); $$ = yylval.opval; }
232 { $$ = invert(scalar($1)); }
236 { $$ = $1; intro_my(); }
240 { $$ = $1; intro_my(); }
244 { $$ = $1; intro_my(); }
248 { $$ = $1; intro_my(); }
266 format : FORMAT startsub WORD block
267 { newFORM($2, $3, $4); }
268 | FORMAT startsub block
269 { newFORM($2, Nullop, $3); }
272 subrout : SUB startsub WORD proto block
273 { newSUB($2, $3, $4, $5); }
274 | SUB startsub WORD proto ';'
275 { newSUB($2, $3, $4, Nullop); expect = XSTATE; }
283 startsub: /* NULL */ /* start a subroutine scope */
284 { $$ = start_subparse(); }
287 package : PACKAGE WORD ';'
293 use : USE startsub WORD WORD listexpr ';'
294 { utilize($1, $2, $3, $4, $5); }
297 expr : expr ANDOP expr
298 { $$ = newLOGOP(OP_AND, 0, $1, $3); }
300 { $$ = newLOGOP($2, 0, $1, $3); }
304 argexpr : argexpr ','
307 { $$ = append_elem(OP_LIST, $1, $3); }
311 listop : LSTOP indirob argexpr
312 { $$ = convert($1, OPf_STACKED,
313 prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); }
314 | FUNC '(' indirob expr ')'
315 { $$ = convert($1, OPf_STACKED,
316 prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); }
317 | term ARROW method '(' listexprcom ')'
318 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
320 prepend_elem(OP_LIST, scalar($1), $5),
321 newUNOP(OP_METHOD, 0, $3))); }
322 | METHOD indirob listexpr
323 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
325 prepend_elem(OP_LIST, $2, $3),
326 newUNOP(OP_METHOD, 0, $1))); }
327 | FUNCMETH indirob '(' listexprcom ')'
328 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
330 prepend_elem(OP_LIST, $2, $4),
331 newUNOP(OP_METHOD, 0, $1))); }
333 { $$ = convert($1, 0, $2); }
334 | FUNC '(' listexprcom ')'
335 { $$ = convert($1, 0, $3); }
336 | LSTOPSUB startsub block listexpr %prec LSTOP
337 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
339 prepend_elem(OP_LIST, newANONSUB($2, 0, $3), $4),
347 term : term ASSIGNOP term
348 { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); }
350 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
352 { if ($2 != OP_REPEAT)
354 $$ = newBINOP($2, 0, $1, scalar($3)); }
356 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
358 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
360 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
362 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
364 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
366 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
368 { $$ = newRANGE($2, scalar($1), scalar($3));}
370 { $$ = newLOGOP(OP_AND, 0, $1, $3); }
372 { $$ = newLOGOP(OP_OR, 0, $1, $3); }
373 | term '?' term ':' term
374 { $$ = newCONDOP(0, $1, $3, $5); }
376 { $$ = bind_match($2, $1, $3); }
378 | '-' term %prec UMINUS
379 { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
380 | '+' term %prec UMINUS
383 { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
385 { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
387 { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); }
389 { $$ = newUNOP(OP_POSTINC, 0,
390 mod(scalar($1), OP_POSTINC)); }
392 { $$ = newUNOP(OP_POSTDEC, 0,
393 mod(scalar($1), OP_POSTDEC)); }
395 { $$ = newUNOP(OP_PREINC, 0,
396 mod(scalar($2), OP_PREINC)); }
398 { $$ = newUNOP(OP_PREDEC, 0,
399 mod(scalar($2), OP_PREDEC)); }
400 | local term %prec UNIOP
401 { $$ = localize($2,$1); }
403 { $$ = sawparens($2); }
405 { $$ = sawparens(newNULLLIST()); }
406 | '[' expr ']' %prec '('
407 { $$ = newANONLIST($2); }
409 { $$ = newANONLIST(Nullop); }
410 | HASHBRACK expr ';' '}' %prec '('
411 { $$ = newANONHASH($2); }
412 | HASHBRACK ';' '}' %prec '('
413 { $$ = newANONHASH(Nullop); }
414 | ANONSUB startsub proto block %prec '('
415 { $$ = newANONSUB($2, $3, $4); }
418 | star '{' expr ';' '}'
419 { $$ = newBINOP(OP_GELEM, 0, newGVREF(0,$1), $3); }
422 | scalar '[' expr ']' %prec '('
423 { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); }
424 | term ARROW '[' expr ']' %prec '('
425 { $$ = newBINOP(OP_AELEM, 0,
426 ref(newAVREF($1),OP_RV2AV),
428 | term '[' expr ']' %prec '('
429 { assertref($1); $$ = newBINOP(OP_AELEM, 0,
430 ref(newAVREF($1),OP_RV2AV),
437 { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
438 | scalar '{' expr ';' '}' %prec '('
439 { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
440 expect = XOPERATOR; }
441 | term ARROW '{' expr ';' '}' %prec '('
442 { $$ = newBINOP(OP_HELEM, 0,
443 ref(newHVREF($1),OP_RV2HV),
445 expect = XOPERATOR; }
446 | term '{' expr ';' '}' %prec '('
447 { assertref($1); $$ = newBINOP(OP_HELEM, 0,
448 ref(newHVREF($1),OP_RV2HV),
450 expect = XOPERATOR; }
451 | '(' expr ')' '[' expr ']' %prec '('
452 { $$ = newSLICEOP(0, $5, $2); }
453 | '(' ')' '[' expr ']' %prec '('
454 { $$ = newSLICEOP(0, $4, Nullop); }
455 | ary '[' expr ']' %prec '('
456 { $$ = prepend_elem(OP_ASLICE,
457 newOP(OP_PUSHMARK, 0),
458 newLISTOP(OP_ASLICE, 0,
460 ref($1, OP_ASLICE))); }
461 | ary '{' expr ';' '}' %prec '('
462 { $$ = prepend_elem(OP_HSLICE,
463 newOP(OP_PUSHMARK, 0),
464 newLISTOP(OP_HSLICE, 0,
466 ref(oopsHV($1), OP_HSLICE)));
467 expect = XOPERATOR; }
471 { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); }
473 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
475 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
476 append_elem(OP_LIST, $3, scalar($1))); }
477 | NOAMP WORD listexpr
478 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
479 append_elem(OP_LIST, $3, scalar($2))); }
480 | DO term %prec UNIOP
481 { $$ = newUNOP(OP_DOFILE, 0, scalar($2)); }
483 { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); }
485 { $$ = newUNOP(OP_ENTERSUB,
486 OPf_SPECIAL|OPf_STACKED,
487 prepend_elem(OP_LIST,
489 (OPpENTERSUB_AMPER<<8),
492 | DO WORD '(' expr ')'
493 { $$ = newUNOP(OP_ENTERSUB,
494 OPf_SPECIAL|OPf_STACKED,
498 (OPpENTERSUB_AMPER<<8),
502 { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
503 prepend_elem(OP_LIST,
504 scalar(newCVREF(0,scalar($2))), Nullop)); dep();}
505 | DO scalar '(' expr ')'
506 { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
507 prepend_elem(OP_LIST,
509 scalar(newCVREF(0,scalar($2))))); dep();}
511 { $$ = newOP($1, OPf_SPECIAL);
512 hints |= HINT_BLOCK_SCOPE; }
514 { $$ = newLOOPEX($1,$2); }
516 { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
518 { $$ = newOP($1, 0); }
520 { $$ = newUNOP($1, 0, $2); }
522 { $$ = newUNOP($1, 0, $2); }
524 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
525 append_elem(OP_LIST, $2, scalar($1))); }
527 { $$ = newOP($1, 0); }
529 { $$ = newOP($1, 0); }
531 { $$ = newUNOP(OP_ENTERSUB, 0,
534 { $$ = newOP($1, OPf_SPECIAL); }
536 { $$ = newUNOP($1, 0, $3); }
537 | PMFUNC '(' term ')'
538 { $$ = pmruntime($1, $3, Nullop); }
539 | PMFUNC '(' term ',' term ')'
540 { $$ = pmruntime($1, $3, $5); }
551 listexprcom: /* NULL */
559 local : LOCAL { $$ = 0; }
564 { in_my = 0; $$ = my($1); }
568 { $$ = newCVREF($1,$2); }
572 { $$ = newSVREF($2); }
576 { $$ = newAVREF($2); }
580 { $$ = newHVREF($2); }
583 arylen : DOLSHARP indirob
584 { $$ = newAVREF($2); }
588 { $$ = newGVREF(0,$2); }