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a0d0e21e 1/* perly.y
a687059c 2 *
0de566d7 3 * Copyright (c) 1991-2002, 2003, 2004 Larry Wall
a687059c 4 *
9ef589d8
LW
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.
8d063cd8 7 *
a0d0e21e
LW
8 */
9
10/*
11 * 'I see,' laughed Strider. 'I look foul and feel fair. Is that it?
14a38fd5 12 * All that is gold does not glitter, not all those who wander are lost.'
8d063cd8
LW
13 */
14
166f8a29
DM
15/* This file holds the grammar for the Perl language. If edited, you need
16 * to run regen_perly.pl, which re-creates the files perly.h, perly.tab
17 * and perly.act which are derived from this.
18 *
19 * The main job of of this grammar is to call the various newFOO()
20 * functions in op.c to build a syntax tree of OP structs.
61296642 21 * It relies on the lexer in toke.c to do the tokenizing.
166f8a29
DM
22 */
23
0de566d7 24/* Make the parser re-entrant. */
8d063cd8 25
0de566d7 26%pure_parser
8d063cd8 27
0de566d7 28%start prog
9d116dd7 29
8d063cd8 30%union {
79072805
LW
31 I32 ival;
32 char *pval;
7f46837f
NC
33#ifdef PERL_MAD
34 TOKEN* tkval;
35#endif
79072805
LW
36 OP *opval;
37 GV *gvval;
8d063cd8
LW
38}
39
fad39ff1 40%token <ival> '{'
f0fcb552 41
a0d0e21e 42%token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF
4633a7c4 43%token <opval> FUNC0SUB UNIOPSUB LSTOPSUB
79072805 44%token <pval> LABEL
a0d0e21e 45%token <ival> FORMAT SUB ANONSUB PACKAGE USE
79072805 46%token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
0d863452 47%token <ival> GIVEN WHEN DEFAULT
79072805 48%token <ival> LOOPEX DOTDOT
36477c24 49%token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
79072805 50%token <ival> RELOP EQOP MULOP ADDOP
55497cff 51%token <ival> DOLSHARP DO HASHBRACK NOAMP
a72a1c8b 52%token <ival> LOCAL MY MYSUB REQUIRE
09bef843 53%token COLONATTR
79072805 54
a034e688 55%type <ival> prog decl format startsub startanonsub startformsub mintro
0d863452 56%type <ival> progstart remember mremember '&' savescope mydefsv
bbce6d69 57%type <opval> block mblock lineseq line loop cond else
fad39ff1 58%type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
a034e688 59%type <opval> argexpr nexpr texpr iexpr mexpr mnexpr miexpr
44a8e56a
PP
60%type <opval> listexpr listexprcom indirob listop method
61%type <opval> formname subname proto subbody cont my_scalar
09bef843 62%type <opval> subattrlist myattrlist mysubrout myattrterm myterm
891be019 63%type <opval> termbinop termunop anonymous termdo
0d863452 64%type <opval> switch case
79072805 65%type <pval> label
79072805 66
fad39ff1
SM
67%nonassoc PREC_LOW
68%nonassoc LOOPEX
69
c963b151 70%left <ival> OROP DOROP
463ee0b2 71%left ANDOP
c07a80fd 72%right NOTOP
36477c24 73%nonassoc LSTOP LSTOPSUB
8d063cd8 74%left ','
a0d0e21e 75%right <ival> ASSIGNOP
8d063cd8
LW
76%right '?' ':'
77%nonassoc DOTDOT
c963b151 78%left OROR DORDOR
8d063cd8 79%left ANDAND
79072805
LW
80%left <ival> BITOROP
81%left <ival> BITANDOP
a687059c
LW
82%nonassoc EQOP
83%nonassoc RELOP
36477c24 84%nonassoc UNIOP UNIOPSUB
20515881 85%nonassoc REQUIRE
79072805 86%left <ival> SHIFTOP
a687059c
LW
87%left ADDOP
88%left MULOP
8990e307 89%left <ival> MATCHOP
79072805
LW
90%right '!' '~' UMINUS REFGEN
91%right <ival> POWOP
92%nonassoc PREINC PREDEC POSTINC POSTDEC
8990e307 93%left ARROW
fad39ff1 94%nonassoc <ival> ')'
8d063cd8 95%left '('
fad39ff1 96%left '[' '{'
8d063cd8 97
7f46837f
NC
98%token PEG
99
8d063cd8
LW
100%% /* RULES */
101
891be019 102/* The whole program */
ecb2f335 103prog : progstart
ae986130 104 /*CONTINUED*/ lineseq
ecb2f335 105 { $$ = $1; newPROG(block_end($1,$2)); }
8d063cd8
LW
106 ;
107
891be019 108/* An ordinary block */
a687059c 109block : '{' remember lineseq '}'
3280af22 110 { if (PL_copline > (line_t)$1)
eb160463 111 PL_copline = (line_t)$1;
36477c24 112 $$ = block_end($2, $3); }
a0d0e21e
LW
113 ;
114
55497cff
PP
115remember: /* NULL */ /* start a full lexical scope */
116 { $$ = block_start(TRUE); }
117 ;
118
0d863452
RH
119mydefsv: /* NULL */ /* lexicalize $_ */
120 { $$ = (I32) allocmy("$_"); }
121 ;
122
ecb2f335
NIS
123progstart:
124 {
ecb2f335
NIS
125 PL_expect = XSTATE; $$ = block_start(TRUE);
126 }
127 ;
128
129
bbce6d69 130mblock : '{' mremember lineseq '}'
3280af22 131 { if (PL_copline > (line_t)$1)
eb160463 132 PL_copline = (line_t)$1;
36477c24 133 $$ = block_end($2, $3); }
55497cff
PP
134 ;
135
136mremember: /* NULL */ /* start a partial lexical scope */
137 { $$ = block_start(FALSE); }
8d063cd8
LW
138 ;
139
500bedb6
DM
140savescope: /* NULL */ /* remember stack pos in case of error */
141 { $$ = PL_savestack_ix; }
142
891be019 143/* A collection of "lines" in the program */
8d063cd8 144lineseq : /* NULL */
79072805
LW
145 { $$ = Nullop; }
146 | lineseq decl
147 { $$ = $1; }
500bedb6
DM
148 | lineseq savescope line
149 { LEAVE_SCOPE($2);
150 $$ = append_list(OP_LINESEQ,
151 (LISTOP*)$1, (LISTOP*)$3);
3280af22 152 PL_pad_reset_pending = TRUE;
500bedb6 153 if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; }
8d063cd8
LW
154 ;
155
891be019 156/* A "line" in the program */
79072805
LW
157line : label cond
158 { $$ = newSTATEOP(0, $1, $2); }
8d063cd8 159 | loop /* loops add their own labels */
0d863452
RH
160 | switch /* ... and so do switches */
161 { $$ = $1; }
162 | label case
163 { $$ = newSTATEOP(0, $1, $2); }
8d063cd8
LW
164 | label ';'
165 { if ($1 != Nullch) {
79072805 166 $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0));
450a55e4
LW
167 }
168 else {
79072805 169 $$ = Nullop;
3280af22 170 PL_copline = NOLINE;
32c2e4fb 171 }
3280af22 172 PL_expect = XSTATE; }
8d063cd8 173 | label sideff ';'
79072805 174 { $$ = newSTATEOP(0, $1, $2);
3280af22 175 PL_expect = XSTATE; }
8d063cd8
LW
176 ;
177
891be019 178/* An expression which may have a side-effect */
a687059c 179sideff : error
79072805 180 { $$ = Nullop; }
a687059c 181 | expr
79072805 182 { $$ = $1; }
a687059c 183 | expr IF expr
79072805 184 { $$ = newLOGOP(OP_AND, 0, $3, $1); }
a687059c 185 | expr UNLESS expr
79072805 186 { $$ = newLOGOP(OP_OR, 0, $3, $1); }
a687059c 187 | expr WHILE expr
8990e307 188 { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); }
55497cff
PP
189 | expr UNTIL iexpr
190 { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);}
ecca16b0 191 | expr FOR expr
eb160463 192 { $$ = newFOROP(0, Nullch, (line_t)$2,
ecca16b0 193 Nullop, $3, $1, Nullop); }
79072805
LW
194 ;
195
891be019 196/* else and elsif blocks */
79072805
LW
197else : /* NULL */
198 { $$ = Nullop; }
55497cff 199 | ELSE mblock
38a230cb 200 { ($2)->op_flags |= OPf_PARENS; $$ = scope($2); }
55497cff 201 | ELSIF '(' mexpr ')' mblock else
eb160463 202 { PL_copline = (line_t)$1;
2c15bef3 203 $$ = newCONDOP(0, $3, scope($5), $6);
3280af22 204 PL_hints |= HINT_BLOCK_SCOPE; }
79072805
LW
205 ;
206
891be019 207/* Real conditional expressions */
55497cff 208cond : IF '(' remember mexpr ')' mblock else
eb160463 209 { PL_copline = (line_t)$1;
36477c24 210 $$ = block_end($3,
bbce6d69 211 newCONDOP(0, $4, scope($6), $7)); }
55497cff 212 | UNLESS '(' remember miexpr ')' mblock else
eb160463 213 { PL_copline = (line_t)$1;
36477c24 214 $$ = block_end($3,
bbce6d69 215 newCONDOP(0, $4, scope($6), $7)); }
79072805
LW
216 ;
217
0d863452
RH
218/* Cases for a switch statement */
219case : WHEN '(' remember mexpr ')' mblock
220 { $$ = block_end($3,
221 newWHENOP($4, scope($6))); }
222 | DEFAULT block
223 { $$ = newWHENOP(0, scope($2)); }
224 ;
225
891be019 226/* Continue blocks */
79072805
LW
227cont : /* NULL */
228 { $$ = Nullop; }
229 | CONTINUE block
230 { $$ = scope($2); }
231 ;
232
891be019 233/* Loops: while, until, for, and a bare block */
a034e688 234loop : label WHILE '(' remember texpr ')' mintro mblock cont
eb160463 235 { PL_copline = (line_t)$2;
36477c24 236 $$ = block_end($4,
55497cff 237 newSTATEOP(0, $1,
bbce6d69 238 newWHILEOP(0, 1, (LOOP*)Nullop,
a034e688
DM
239 $2, $5, $8, $9, $7))); }
240 | label UNTIL '(' remember iexpr ')' mintro mblock cont
eb160463 241 { PL_copline = (line_t)$2;
36477c24 242 $$ = block_end($4,
55497cff 243 newSTATEOP(0, $1,
bbce6d69 244 newWHILEOP(0, 1, (LOOP*)Nullop,
a034e688 245 $2, $5, $8, $9, $7))); }
bbce6d69 246 | label FOR MY remember my_scalar '(' mexpr ')' mblock cont
36477c24 247 { $$ = block_end($4,
eb160463 248 newFOROP(0, $1, (line_t)$2, $5, $7, $9, $10)); }
bbce6d69 249 | label FOR scalar '(' remember mexpr ')' mblock cont
36477c24 250 { $$ = block_end($5,
eb160463 251 newFOROP(0, $1, (line_t)$2, mod($3, OP_ENTERLOOP),
bbce6d69
PP
252 $6, $8, $9)); }
253 | label FOR '(' remember mexpr ')' mblock cont
36477c24 254 { $$ = block_end($4,
eb160463 255 newFOROP(0, $1, (line_t)$2, Nullop, $5, $7, $8)); }
a034e688
DM
256 | label FOR '(' remember mnexpr ';' texpr ';' mintro mnexpr ')'
257 mblock
8d063cd8 258 /* basically fake up an initialize-while lineseq */
36c66720 259 { OP *forop;
eb160463 260 PL_copline = (line_t)$2;
36c66720
RH
261 forop = newSTATEOP(0, $1,
262 newWHILEOP(0, 1, (LOOP*)Nullop,
263 $2, scalar($7),
a034e688 264 $12, $10, $9));
36c66720
RH
265 if ($5) {
266 forop = append_elem(OP_LINESEQ,
267 newSTATEOP(0, ($1?savepv($1):Nullch),
268 $5),
269 forop);
270 }
271
272 $$ = block_end($4, forop); }
79072805 273 | label block cont /* a block is a loop that happens once */
fb73857a
PP
274 { $$ = newSTATEOP(0, $1,
275 newWHILEOP(0, 1, (LOOP*)Nullop,
a034e688 276 NOLINE, Nullop, $2, $3, 0)); }
8d063cd8
LW
277 ;
278
0d863452
RH
279/* Switch blocks */
280switch : label GIVEN '(' remember mydefsv mexpr ')' mblock
281 { PL_copline = (line_t) $2;
282 $$ = block_end($4,
283 newSTATEOP(0, $1,
284 newGIVENOP($6, scope($8),
285 (PADOFFSET) $5) )); }
286 ;
287
a034e688
DM
288/* determine whether there are any new my declarations */
289mintro : /* NULL */
290 { $$ = (PL_min_intro_pending &&
291 PL_max_intro_pending >= PL_min_intro_pending);
292 intro_my(); }
293
891be019 294/* Normal expression */
8d063cd8 295nexpr : /* NULL */
79072805 296 { $$ = Nullop; }
8d063cd8
LW
297 | sideff
298 ;
299
891be019 300/* Boolean expression */
8d063cd8 301texpr : /* NULL means true */
b73d6f50 302 { (void)scan_num("1", &yylval); $$ = yylval.opval; }
8d063cd8
LW
303 | expr
304 ;
305
891be019 306/* Inverted boolean expression */
55497cff
PP
307iexpr : expr
308 { $$ = invert(scalar($1)); }
309 ;
310
891be019 311/* Expression with its own lexical scope */
55497cff 312mexpr : expr
bbce6d69
PP
313 { $$ = $1; intro_my(); }
314 ;
315
316mnexpr : nexpr
317 { $$ = $1; intro_my(); }
55497cff
PP
318 ;
319
55497cff 320miexpr : iexpr
bbce6d69 321 { $$ = $1; intro_my(); }
55497cff
PP
322 ;
323
891be019 324/* Optional "MAIN:"-style loop labels */
8d063cd8
LW
325label : /* empty */
326 { $$ = Nullch; }
32c2e4fb 327 | LABEL
8d063cd8
LW
328 ;
329
891be019 330/* Some kind of declaration - does not take part in the parse tree */
8d063cd8
LW
331decl : format
332 { $$ = 0; }
333 | subrout
334 { $$ = 0; }
09bef843
SB
335 | mysubrout
336 { $$ = 0; }
a687059c
LW
337 | package
338 { $$ = 0; }
a0d0e21e 339 | use
85e6fe83 340 { $$ = 0; }
8d063cd8
LW
341 ;
342
44a8e56a 343format : FORMAT startformsub formname block
a8ff2fa6
DM
344 { SvREFCNT_inc(PL_compcv);
345 newFORM($2, $3, $4); }
44a8e56a
PP
346 ;
347
348formname: WORD { $$ = $1; }
349 | /* NULL */ { $$ = Nullop; }
8d063cd8
LW
350 ;
351
891be019 352/* Unimplemented "my sub foo { }" */
09bef843 353mysubrout: MYSUB startsub subname proto subattrlist subbody
a8ff2fa6
DM
354 { SvREFCNT_inc(PL_compcv);
355 newMYSUB($2, $3, $4, $5, $6); }
09bef843
SB
356 ;
357
891be019 358/* Subroutine definition */
09bef843 359subrout : SUB startsub subname proto subattrlist subbody
a8ff2fa6
DM
360 { SvREFCNT_inc(PL_compcv);
361 newATTRSUB($2, $3, $4, $5, $6); }
28757baa
PP
362 ;
363
fa83b5b6 364startsub: /* NULL */ /* start a regular subroutine scope */
a8ff2fa6
DM
365 { $$ = start_subparse(FALSE, 0);
366 SAVEFREESV(PL_compcv); }
28757baa
PP
367 ;
368
369startanonsub: /* NULL */ /* start an anonymous subroutine scope */
a8ff2fa6
DM
370 { $$ = start_subparse(FALSE, CVf_ANON);
371 SAVEFREESV(PL_compcv); }
28757baa
PP
372 ;
373
44a8e56a 374startformsub: /* NULL */ /* start a format subroutine scope */
a8ff2fa6
DM
375 { $$ = start_subparse(TRUE, 0);
376 SAVEFREESV(PL_compcv); }
44a8e56a
PP
377 ;
378
891be019 379/* Name of a subroutine - must be a bareword, could be special */
2596d9fe 380subname : WORD { const char *const name = SvPV_nolen_const(((SVOP*)$1)->op_sv);
e858de61 381 if (strEQ(name, "BEGIN") || strEQ(name, "END")
7d30b5c4 382 || strEQ(name, "INIT") || strEQ(name, "CHECK"))
1aff0e91 383 CvSPECIAL_on(PL_compcv);
28757baa 384 $$ = $1; }
a0d0e21e
LW
385 ;
386
891be019 387/* Subroutine prototype */
4633a7c4
LW
388proto : /* NULL */
389 { $$ = Nullop; }
390 | THING
391 ;
28757baa 392
891be019 393/* Optional list of subroutine attributes */
09bef843
SB
394subattrlist: /* NULL */
395 { $$ = Nullop; }
396 | COLONATTR THING
397 { $$ = $2; }
398 | COLONATTR
399 { $$ = Nullop; }
400 ;
401
891be019 402/* List of attributes for a "my" variable declaration */
09bef843
SB
403myattrlist: COLONATTR THING
404 { $$ = $2; }
405 | COLONATTR
406 { $$ = Nullop; }
407 ;
408
891be019 409/* Subroutine body - either null or a block */
28757baa 410subbody : block { $$ = $1; }
3280af22 411 | ';' { $$ = Nullop; PL_expect = XSTATE; }
8d063cd8
LW
412 ;
413
a687059c 414package : PACKAGE WORD ';'
79072805 415 { package($2); }
a687059c
LW
416 ;
417
28757baa 418use : USE startsub
1aff0e91 419 { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
28757baa 420 WORD WORD listexpr ';'
a8ff2fa6
DM
421 { SvREFCNT_inc(PL_compcv);
422 utilize($1, $2, $4, $5, $6); }
85e6fe83
LW
423 ;
424
891be019 425/* Ordinary expressions; logical combinations */
a0d0e21e
LW
426expr : expr ANDOP expr
427 { $$ = newLOGOP(OP_AND, 0, $1, $3); }
428 | expr OROP expr
429 { $$ = newLOGOP($2, 0, $1, $3); }
c963b151
BD
430 | expr DOROP expr
431 { $$ = newLOGOP(OP_DOR, 0, $1, $3); }
fad39ff1 432 | argexpr %prec PREC_LOW
a0d0e21e
LW
433 ;
434
891be019 435/* Expressions are a list of terms joined by commas */
a0d0e21e
LW
436argexpr : argexpr ','
437 { $$ = $1; }
438 | argexpr ',' term
79072805 439 { $$ = append_elem(OP_LIST, $1, $3); }
fad39ff1 440 | term %prec PREC_LOW
8d063cd8
LW
441 ;
442
891be019 443/* List operators */
ad4673e5 444listop : LSTOP indirob argexpr /* map {...} @args or print $fh @args */
79072805 445 { $$ = convert($1, OPf_STACKED,
a0d0e21e 446 prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); }
891be019 447 | FUNC '(' indirob expr ')' /* print ($fh @args */
79072805 448 { $$ = convert($1, OPf_STACKED,
a0d0e21e 449 prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); }
891be019 450 | term ARROW method '(' listexprcom ')' /* $foo->bar(list) */
4633a7c4 451 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
a0d0e21e 452 append_elem(OP_LIST,
55497cff 453 prepend_elem(OP_LIST, scalar($1), $5),
a0d0e21e 454 newUNOP(OP_METHOD, 0, $3))); }
891be019 455 | term ARROW method /* $foo->bar */
b1524f17
SM
456 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
457 append_elem(OP_LIST, scalar($1),
458 newUNOP(OP_METHOD, 0, $3))); }
891be019 459 | METHOD indirob listexpr /* new Class @args */
4633a7c4 460 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
a0d0e21e 461 append_elem(OP_LIST,
4633a7c4 462 prepend_elem(OP_LIST, $2, $3),
a0d0e21e 463 newUNOP(OP_METHOD, 0, $1))); }
891be019 464 | FUNCMETH indirob '(' listexprcom ')' /* method $object (@args) */
4633a7c4 465 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
a0d0e21e 466 append_elem(OP_LIST,
4633a7c4 467 prepend_elem(OP_LIST, $2, $4),
a0d0e21e 468 newUNOP(OP_METHOD, 0, $1))); }
891be019 469 | LSTOP listexpr /* print @args */
79072805 470 { $$ = convert($1, 0, $2); }
891be019 471 | FUNC '(' listexprcom ')' /* print (@args) */
79072805 472 { $$ = convert($1, 0, $3); }
ad4673e5 473 | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */
a8ff2fa6
DM
474 { SvREFCNT_inc(PL_compcv);
475 $3 = newANONATTRSUB($2, 0, Nullop, $3); }
891be019 476 listexpr %prec LSTOP /* ... @bar */
4633a7c4 477 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
28757baa
PP
478 append_elem(OP_LIST,
479 prepend_elem(OP_LIST, $3, $5), $1)); }
a687059c
LW
480 ;
481
891be019 482/* Names of methods. May use $object->$methodname */
a0d0e21e
LW
483method : METHOD
484 | scalar
485 ;
486
891be019
SC
487/* Some kind of subscripted expression */
488subscripted: star '{' expr ';' '}' /* *main::{something} */
489 /* In this and all the hash accessors, ';' is
490 * provided by the tokeniser */
264e1af3
RGS
491 { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3));
492 PL_expect = XOPERATOR; }
891be019 493 | scalar '[' expr ']' /* $array[$element] */
fad39ff1 494 { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); }
891be019 495 | term ARROW '[' expr ']' /* somearef->[$element] */
fad39ff1
SM
496 { $$ = newBINOP(OP_AELEM, 0,
497 ref(newAVREF($1),OP_RV2AV),
498 scalar($4));}
891be019 499 | subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */
fad39ff1
SM
500 { $$ = newBINOP(OP_AELEM, 0,
501 ref(newAVREF($1),OP_RV2AV),
502 scalar($3));}
891be019 503 | scalar '{' expr ';' '}' /* $foo->{bar();} */
fad39ff1
SM
504 { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
505 PL_expect = XOPERATOR; }
891be019 506 | term ARROW '{' expr ';' '}' /* somehref->{bar();} */
fad39ff1
SM
507 { $$ = newBINOP(OP_HELEM, 0,
508 ref(newHVREF($1),OP_RV2HV),
509 jmaybe($4));
510 PL_expect = XOPERATOR; }
891be019 511 | subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */
fad39ff1
SM
512 { $$ = newBINOP(OP_HELEM, 0,
513 ref(newHVREF($1),OP_RV2HV),
514 jmaybe($3));
515 PL_expect = XOPERATOR; }
891be019 516 | term ARROW '(' ')' /* $subref->() */
fad39ff1
SM
517 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
518 newCVREF(0, scalar($1))); }
891be019 519 | term ARROW '(' expr ')' /* $subref->(@args) */
fad39ff1
SM
520 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
521 append_elem(OP_LIST, $4,
522 newCVREF(0, scalar($1)))); }
523
891be019 524 | subscripted '(' expr ')' /* $foo->{bar}->(@args) */
fad39ff1
SM
525 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
526 append_elem(OP_LIST, $3,
527 newCVREF(0, scalar($1)))); }
891be019 528 | subscripted '(' ')' /* $foo->{bar}->() */
fad39ff1
SM
529 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
530 newCVREF(0, scalar($1))); }
9a9798c2
YST
531 | '(' expr ')' '[' expr ']' /* list slice */
532 { $$ = newSLICEOP(0, $5, $2); }
533 | '(' ')' '[' expr ']' /* empty list slice! */
534 { $$ = newSLICEOP(0, $4, Nullop); }
891be019 535 ;
fad39ff1 536
891be019
SC
537/* Binary operators between terms */
538termbinop : term ASSIGNOP term /* $x = $y */
a0d0e21e 539 { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); }
891be019 540 | term POWOP term /* $x ** $y */
79072805 541 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 542 | term MULOP term /* $x * $y, $x x $y */
79072805
LW
543 { if ($2 != OP_REPEAT)
544 scalar($1);
545 $$ = newBINOP($2, 0, $1, scalar($3)); }
891be019 546 | term ADDOP term /* $x + $y */
79072805 547 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 548 | term SHIFTOP term /* $x >> $y, $x << $y */
79072805 549 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 550 | term RELOP term /* $x > $y, etc. */
79072805 551 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 552 | term EQOP term /* $x == $y, $x eq $y */
79072805 553 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 554 | term BITANDOP term /* $x & $y */
79072805 555 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 556 | term BITOROP term /* $x | $y */
79072805 557 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 558 | term DOTDOT term /* $x..$y, $x...$y */
79072805 559 { $$ = newRANGE($2, scalar($1), scalar($3));}
891be019 560 | term ANDAND term /* $x && $y */
463ee0b2 561 { $$ = newLOGOP(OP_AND, 0, $1, $3); }
891be019 562 | term OROR term /* $x || $y */
463ee0b2 563 { $$ = newLOGOP(OP_OR, 0, $1, $3); }
c963b151
BD
564 | term DORDOR term /* $x // $y */
565 { $$ = newLOGOP(OP_DOR, 0, $1, $3); }
891be019 566 | term MATCHOP term /* $x =~ /$y/ */
79072805 567 { $$ = bind_match($2, $1, $3); }
891be019 568 ;
8d063cd8 569
891be019
SC
570/* Unary operators and terms */
571termunop : '-' term %prec UMINUS /* -$x */
79072805 572 { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
891be019 573 | '+' term %prec UMINUS /* +$x */
a687059c 574 { $$ = $2; }
891be019 575 | '!' term /* !$x */
79072805 576 { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
891be019 577 | '~' term /* ~$x */
79072805 578 { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
891be019 579 | term POSTINC /* $x++ */
79072805 580 { $$ = newUNOP(OP_POSTINC, 0,
463ee0b2 581 mod(scalar($1), OP_POSTINC)); }
891be019 582 | term POSTDEC /* $x-- */
79072805 583 { $$ = newUNOP(OP_POSTDEC, 0,
463ee0b2 584 mod(scalar($1), OP_POSTDEC)); }
891be019 585 | PREINC term /* ++$x */
79072805 586 { $$ = newUNOP(OP_PREINC, 0,
463ee0b2 587 mod(scalar($2), OP_PREINC)); }
891be019 588 | PREDEC term /* --$x */
79072805 589 { $$ = newUNOP(OP_PREDEC, 0,
463ee0b2 590 mod(scalar($2), OP_PREDEC)); }
891be019
SC
591
592 ;
593
594/* Constructors for anonymous data */
595anonymous: '[' expr ']'
596 { $$ = newANONLIST($2); }
597 | '[' ']'
598 { $$ = newANONLIST(Nullop); }
599 | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */
ecb2f335 600 { $$ = newANONHASH($2); }
891be019
SC
601 | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */
602 { $$ = newANONHASH(Nullop); }
603 | ANONSUB startanonsub proto subattrlist block %prec '('
a8ff2fa6
DM
604 { SvREFCNT_inc(PL_compcv);
605 $$ = newANONATTRSUB($2, $3, $4, $5); }
891be019
SC
606
607 ;
608
609/* Things called with "do" */
610termdo : DO term %prec UNIOP /* do $filename */
850e8516 611 { $$ = dofile($2, $1); }
891be019
SC
612 | DO block %prec '(' /* do { code */
613 { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); }
614 | DO WORD '(' ')' /* do somesub() */
615 { $$ = newUNOP(OP_ENTERSUB,
616 OPf_SPECIAL|OPf_STACKED,
617 prepend_elem(OP_LIST,
618 scalar(newCVREF(
619 (OPpENTERSUB_AMPER<<8),
620 scalar($2)
621 )),Nullop)); dep();}
622 | DO WORD '(' expr ')' /* do somesub(@args) */
623 { $$ = newUNOP(OP_ENTERSUB,
624 OPf_SPECIAL|OPf_STACKED,
625 append_elem(OP_LIST,
626 $4,
627 scalar(newCVREF(
628 (OPpENTERSUB_AMPER<<8),
629 scalar($2)
630 )))); dep();}
631 | DO scalar '(' ')' /* do $subref () */
632 { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
633 prepend_elem(OP_LIST,
634 scalar(newCVREF(0,scalar($2))), Nullop)); dep();}
635 | DO scalar '(' expr ')' /* do $subref (@args) */
636 { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
637 prepend_elem(OP_LIST,
638 $4,
639 scalar(newCVREF(0,scalar($2))))); dep();}
640
641 ;
642
643term : termbinop
644 | termunop
645 | anonymous
646 | termdo
e9bdcc27 647 | term '?' term ':' term
891be019
SC
648 { $$ = newCONDOP(0, $1, $3, $5); }
649 | REFGEN term /* \$x, \@y, \%z */
650 { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); }
09bef843
SB
651 | myattrterm %prec UNIOP
652 { $$ = $1; }
653 | LOCAL term %prec UNIOP
93a17b20 654 { $$ = localize($2,$1); }
a0d0e21e 655 | '(' expr ')'
79072805 656 { $$ = sawparens($2); }
8d063cd8 657 | '(' ')'
8990e307 658 { $$ = sawparens(newNULLLIST()); }
79072805 659 | scalar %prec '('
8d063cd8 660 { $$ = $1; }
79072805 661 | star %prec '('
8d063cd8 662 { $$ = $1; }
79072805 663 | hsh %prec '('
8d063cd8 664 { $$ = $1; }
79072805 665 | ary %prec '('
8d063cd8 666 { $$ = $1; }
891be019 667 | arylen %prec '(' /* $#x, $#{ something } */
79072805 668 { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
fad39ff1
SM
669 | subscripted
670 { $$ = $1; }
891be019 671 | ary '[' expr ']' /* array slice */
79072805
LW
672 { $$ = prepend_elem(OP_ASLICE,
673 newOP(OP_PUSHMARK, 0),
79072805
LW
674 newLISTOP(OP_ASLICE, 0,
675 list($3),
a0d0e21e 676 ref($1, OP_ASLICE))); }
891be019 677 | ary '{' expr ';' '}' /* @hash{@keys} */
79072805
LW
678 { $$ = prepend_elem(OP_HSLICE,
679 newOP(OP_PUSHMARK, 0),
79072805
LW
680 newLISTOP(OP_HSLICE, 0,
681 list($3),
a0d0e21e 682 ref(oopsHV($1), OP_HSLICE)));
3280af22 683 PL_expect = XOPERATOR; }
79072805
LW
684 | THING %prec '('
685 { $$ = $1; }
891be019 686 | amper /* &foo; */
c07a80fd 687 { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); }
ecb2f335 688 | amper '(' ')' /* &foo() */
a0d0e21e 689 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
891be019 690 | amper '(' expr ')' /* &foo(@args) */
a0d0e21e 691 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
4633a7c4 692 append_elem(OP_LIST, $3, scalar($1))); }
891be019 693 | NOAMP WORD listexpr /* foo(@args) */
a0d0e21e 694 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
a5f75d66 695 append_elem(OP_LIST, $3, scalar($2))); }
891be019 696 | LOOPEX /* loop exiting command (goto, last, dump, etc) */
85e6fe83 697 { $$ = newOP($1, OPf_SPECIAL);
3280af22 698 PL_hints |= HINT_BLOCK_SCOPE; }
a0d0e21e 699 | LOOPEX term
8990e307 700 { $$ = newLOOPEX($1,$2); }
891be019 701 | NOTOP argexpr /* not $foo */
c07a80fd 702 { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
891be019 703 | UNIOP /* Unary op, $_ implied */
79072805 704 { $$ = newOP($1, 0); }
30173ab5 705 | UNIOP block /* eval { foo } */
79072805 706 { $$ = newUNOP($1, 0, $2); }
891be019 707 | UNIOP term /* Unary op */
79072805 708 { $$ = newUNOP($1, 0, $2); }
a72a1c8b
RGS
709 | REQUIRE /* require, $_ implied */
710 { $$ = newOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0); }
711 | REQUIRE term /* require Foo */
712 { $$ = newUNOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0, $2); }
891be019 713 | UNIOPSUB term /* Sub treated as unop */
4633a7c4
LW
714 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
715 append_elem(OP_LIST, $2, scalar($1))); }
891be019 716 | FUNC0 /* Nullary operator */
79072805 717 { $$ = newOP($1, 0); }
ae986130 718 | FUNC0 '(' ')'
79072805 719 { $$ = newOP($1, 0); }
891be019 720 | FUNC0SUB /* Sub treated as nullop */
28757baa 721 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
4633a7c4 722 scalar($1)); }
891be019 723 | FUNC1 '(' ')' /* not () */
a758b0b5
MHM
724 { $$ = $1 == OP_NOT ? newUNOP($1, 0, newSVOP(OP_CONST, 0, newSViv(0)))
725 : newOP($1, OPf_SPECIAL); }
891be019 726 | FUNC1 '(' expr ')' /* not($foo) */
79072805 727 { $$ = newUNOP($1, 0, $3); }
131b3ad0
DM
728 | PMFUNC '(' argexpr ')' /* m//, s///, tr/// */
729 { $$ = pmruntime($1, $3, 1); }
79072805 730 | WORD
378cc40b 731 | listop
8d063cd8
LW
732 ;
733
891be019 734/* "my" declarations, with optional attributes */
09bef843
SB
735myattrterm: MY myterm myattrlist
736 { $$ = my_attrs($2,$3); }
737 | MY myterm
738 { $$ = localize($2,$1); }
739 ;
740
891be019 741/* Things that can be "my"'d */
09bef843
SB
742myterm : '(' expr ')'
743 { $$ = sawparens($2); }
744 | '(' ')'
745 { $$ = sawparens(newNULLLIST()); }
746 | scalar %prec '('
747 { $$ = $1; }
748 | hsh %prec '('
749 { $$ = $1; }
750 | ary %prec '('
751 { $$ = $1; }
752 ;
753
891be019 754/* Basic list expressions */
fad39ff1 755listexpr: /* NULL */ %prec PREC_LOW
8990e307 756 { $$ = Nullop; }
fad39ff1 757 | argexpr %prec PREC_LOW
a0d0e21e
LW
758 { $$ = $1; }
759 ;
760
761listexprcom: /* NULL */
762 { $$ = Nullop; }
79072805
LW
763 | expr
764 { $$ = $1; }
a0d0e21e
LW
765 | expr ','
766 { $$ = $1; }
79072805
LW
767 ;
768
891be019
SC
769/* A little bit of trickery to make "for my $foo (@bar)" actually be
770 lexical */
55497cff 771my_scalar: scalar
3280af22 772 { PL_in_my = 0; $$ = my($1); }
55497cff
PP
773 ;
774
79072805 775amper : '&' indirob
c07a80fd 776 { $$ = newCVREF($1,$2); }
a687059c
LW
777 ;
778
79072805
LW
779scalar : '$' indirob
780 { $$ = newSVREF($2); }
a687059c
LW
781 ;
782
79072805
LW
783ary : '@' indirob
784 { $$ = newAVREF($2); }
785 ;
786
787hsh : '%' indirob
788 { $$ = newHVREF($2); }
789 ;
790
791arylen : DOLSHARP indirob
792 { $$ = newAVREF($2); }
793 ;
794
795star : '*' indirob
a0d0e21e 796 { $$ = newGVREF(0,$2); }
79072805
LW
797 ;
798
891be019 799/* Indirect objects */
79072805
LW
800indirob : WORD
801 { $$ = scalar($1); }
fad39ff1 802 | scalar %prec PREC_LOW
463ee0b2 803 { $$ = scalar($1); }
79072805 804 | block
a0d0e21e 805 { $$ = scope($1); }
79072805 806
93a17b20
LW
807 | PRIVATEREF
808 { $$ = $1; }
8d063cd8 809 ;