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Fix copy & paste bugs in mX?PUSH macro tests.
[perl5.git] / perly.y
CommitLineData
a0d0e21e 1/* perly.y
a687059c 2 *
0de566d7 3 * Copyright (c) 1991-2002, 2003, 2004 Larry Wall
a687059c 4 *
9ef589d8
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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 *
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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.'
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13 */
14
0de566d7 15/* Make the parser re-entrant. */
8d063cd8 16
0de566d7 17%pure_parser
8d063cd8 18
0de566d7 19%start prog
9d116dd7 20
8d063cd8 21%union {
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22 I32 ival;
23 char *pval;
24 OP *opval;
25 GV *gvval;
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26}
27
fad39ff1 28%token <ival> '{'
f0fcb552 29
a0d0e21e 30%token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF
4633a7c4 31%token <opval> FUNC0SUB UNIOPSUB LSTOPSUB
79072805 32%token <pval> LABEL
a0d0e21e 33%token <ival> FORMAT SUB ANONSUB PACKAGE USE
79072805
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34%token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
35%token <ival> LOOPEX DOTDOT
36477c24 36%token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
79072805 37%token <ival> RELOP EQOP MULOP ADDOP
55497cff 38%token <ival> DOLSHARP DO HASHBRACK NOAMP
09bef843
SB
39%token <ival> LOCAL MY MYSUB
40%token COLONATTR
79072805 41
09bef843 42%type <ival> prog decl format startsub startanonsub startformsub
500bedb6 43%type <ival> progstart remember mremember '&' savescope
bbce6d69 44%type <opval> block mblock lineseq line loop cond else
fad39ff1 45%type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
bbce6d69 46%type <opval> argexpr nexpr texpr iexpr mexpr mnexpr mtexpr miexpr
44a8e56a
PP
47%type <opval> listexpr listexprcom indirob listop method
48%type <opval> formname subname proto subbody cont my_scalar
09bef843 49%type <opval> subattrlist myattrlist mysubrout myattrterm myterm
891be019 50%type <opval> termbinop termunop anonymous termdo
79072805 51%type <pval> label
79072805 52
fad39ff1
SM
53%nonassoc PREC_LOW
54%nonassoc LOOPEX
55
c963b151 56%left <ival> OROP DOROP
463ee0b2 57%left ANDOP
c07a80fd 58%right NOTOP
36477c24 59%nonassoc LSTOP LSTOPSUB
8d063cd8 60%left ','
a0d0e21e 61%right <ival> ASSIGNOP
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62%right '?' ':'
63%nonassoc DOTDOT
c963b151 64%left OROR DORDOR
8d063cd8 65%left ANDAND
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66%left <ival> BITOROP
67%left <ival> BITANDOP
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LW
68%nonassoc EQOP
69%nonassoc RELOP
36477c24 70%nonassoc UNIOP UNIOPSUB
79072805 71%left <ival> SHIFTOP
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72%left ADDOP
73%left MULOP
8990e307 74%left <ival> MATCHOP
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75%right '!' '~' UMINUS REFGEN
76%right <ival> POWOP
77%nonassoc PREINC PREDEC POSTINC POSTDEC
8990e307 78%left ARROW
fad39ff1 79%nonassoc <ival> ')'
8d063cd8 80%left '('
fad39ff1 81%left '[' '{'
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82
83%% /* RULES */
84
891be019 85/* The whole program */
ecb2f335 86prog : progstart
ae986130 87 /*CONTINUED*/ lineseq
ecb2f335 88 { $$ = $1; newPROG(block_end($1,$2)); }
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LW
89 ;
90
891be019 91/* An ordinary block */
a687059c 92block : '{' remember lineseq '}'
3280af22 93 { if (PL_copline > (line_t)$1)
eb160463 94 PL_copline = (line_t)$1;
36477c24 95 $$ = block_end($2, $3); }
a0d0e21e
LW
96 ;
97
55497cff
PP
98remember: /* NULL */ /* start a full lexical scope */
99 { $$ = block_start(TRUE); }
100 ;
101
ecb2f335
NIS
102progstart:
103 {
ecb2f335
NIS
104 PL_expect = XSTATE; $$ = block_start(TRUE);
105 }
106 ;
107
108
bbce6d69 109mblock : '{' mremember lineseq '}'
3280af22 110 { if (PL_copline > (line_t)$1)
eb160463 111 PL_copline = (line_t)$1;
36477c24 112 $$ = block_end($2, $3); }
55497cff
PP
113 ;
114
115mremember: /* NULL */ /* start a partial lexical scope */
116 { $$ = block_start(FALSE); }
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LW
117 ;
118
500bedb6
DM
119savescope: /* NULL */ /* remember stack pos in case of error */
120 { $$ = PL_savestack_ix; }
121
891be019 122/* A collection of "lines" in the program */
8d063cd8 123lineseq : /* NULL */
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LW
124 { $$ = Nullop; }
125 | lineseq decl
126 { $$ = $1; }
500bedb6
DM
127 | lineseq savescope line
128 { LEAVE_SCOPE($2);
129 $$ = append_list(OP_LINESEQ,
130 (LISTOP*)$1, (LISTOP*)$3);
3280af22 131 PL_pad_reset_pending = TRUE;
500bedb6 132 if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; }
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LW
133 ;
134
891be019 135/* A "line" in the program */
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136line : label cond
137 { $$ = newSTATEOP(0, $1, $2); }
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138 | loop /* loops add their own labels */
139 | label ';'
140 { if ($1 != Nullch) {
79072805 141 $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0));
450a55e4
LW
142 }
143 else {
79072805 144 $$ = Nullop;
3280af22 145 PL_copline = NOLINE;
32c2e4fb 146 }
3280af22 147 PL_expect = XSTATE; }
8d063cd8 148 | label sideff ';'
79072805 149 { $$ = newSTATEOP(0, $1, $2);
3280af22 150 PL_expect = XSTATE; }
8d063cd8
LW
151 ;
152
891be019 153/* An expression which may have a side-effect */
a687059c 154sideff : error
79072805 155 { $$ = Nullop; }
a687059c 156 | expr
79072805 157 { $$ = $1; }
a687059c 158 | expr IF expr
79072805 159 { $$ = newLOGOP(OP_AND, 0, $3, $1); }
a687059c 160 | expr UNLESS expr
79072805 161 { $$ = newLOGOP(OP_OR, 0, $3, $1); }
a687059c 162 | expr WHILE expr
8990e307 163 { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); }
55497cff
PP
164 | expr UNTIL iexpr
165 { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);}
ecca16b0 166 | expr FOR expr
eb160463 167 { $$ = newFOROP(0, Nullch, (line_t)$2,
ecca16b0 168 Nullop, $3, $1, Nullop); }
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LW
169 ;
170
891be019 171/* else and elsif blocks */
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172else : /* NULL */
173 { $$ = Nullop; }
55497cff 174 | ELSE mblock
38a230cb 175 { ($2)->op_flags |= OPf_PARENS; $$ = scope($2); }
55497cff 176 | ELSIF '(' mexpr ')' mblock else
eb160463 177 { PL_copline = (line_t)$1;
2c15bef3 178 $$ = newCONDOP(0, $3, scope($5), $6);
3280af22 179 PL_hints |= HINT_BLOCK_SCOPE; }
79072805
LW
180 ;
181
891be019 182/* Real conditional expressions */
55497cff 183cond : IF '(' remember mexpr ')' mblock else
eb160463 184 { PL_copline = (line_t)$1;
36477c24 185 $$ = block_end($3,
bbce6d69 186 newCONDOP(0, $4, scope($6), $7)); }
55497cff 187 | UNLESS '(' remember miexpr ')' mblock else
eb160463 188 { PL_copline = (line_t)$1;
36477c24 189 $$ = block_end($3,
bbce6d69 190 newCONDOP(0, $4, scope($6), $7)); }
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LW
191 ;
192
891be019 193/* Continue blocks */
79072805
LW
194cont : /* NULL */
195 { $$ = Nullop; }
196 | CONTINUE block
197 { $$ = scope($2); }
198 ;
199
891be019 200/* Loops: while, until, for, and a bare block */
55497cff 201loop : label WHILE '(' remember mtexpr ')' mblock cont
eb160463 202 { PL_copline = (line_t)$2;
36477c24 203 $$ = block_end($4,
55497cff 204 newSTATEOP(0, $1,
bbce6d69 205 newWHILEOP(0, 1, (LOOP*)Nullop,
fb73857a 206 $2, $5, $7, $8))); }
55497cff 207 | label UNTIL '(' remember miexpr ')' mblock cont
eb160463 208 { PL_copline = (line_t)$2;
36477c24 209 $$ = block_end($4,
55497cff 210 newSTATEOP(0, $1,
bbce6d69 211 newWHILEOP(0, 1, (LOOP*)Nullop,
fb73857a 212 $2, $5, $7, $8))); }
bbce6d69 213 | label FOR MY remember my_scalar '(' mexpr ')' mblock cont
36477c24 214 { $$ = block_end($4,
eb160463 215 newFOROP(0, $1, (line_t)$2, $5, $7, $9, $10)); }
bbce6d69 216 | label FOR scalar '(' remember mexpr ')' mblock cont
36477c24 217 { $$ = block_end($5,
eb160463 218 newFOROP(0, $1, (line_t)$2, mod($3, OP_ENTERLOOP),
bbce6d69
PP
219 $6, $8, $9)); }
220 | label FOR '(' remember mexpr ')' mblock cont
36477c24 221 { $$ = block_end($4,
eb160463 222 newFOROP(0, $1, (line_t)$2, Nullop, $5, $7, $8)); }
bbce6d69 223 | label FOR '(' remember mnexpr ';' mtexpr ';' mnexpr ')' mblock
8d063cd8 224 /* basically fake up an initialize-while lineseq */
36c66720 225 { OP *forop;
eb160463 226 PL_copline = (line_t)$2;
36c66720
RH
227 forop = newSTATEOP(0, $1,
228 newWHILEOP(0, 1, (LOOP*)Nullop,
229 $2, scalar($7),
230 $11, $9));
231 if ($5) {
232 forop = append_elem(OP_LINESEQ,
233 newSTATEOP(0, ($1?savepv($1):Nullch),
234 $5),
235 forop);
236 }
237
238 $$ = block_end($4, forop); }
79072805 239 | label block cont /* a block is a loop that happens once */
fb73857a
PP
240 { $$ = newSTATEOP(0, $1,
241 newWHILEOP(0, 1, (LOOP*)Nullop,
242 NOLINE, Nullop, $2, $3)); }
8d063cd8
LW
243 ;
244
891be019 245/* Normal expression */
8d063cd8 246nexpr : /* NULL */
79072805 247 { $$ = Nullop; }
8d063cd8
LW
248 | sideff
249 ;
250
891be019 251/* Boolean expression */
8d063cd8 252texpr : /* NULL means true */
b73d6f50 253 { (void)scan_num("1", &yylval); $$ = yylval.opval; }
8d063cd8
LW
254 | expr
255 ;
256
891be019 257/* Inverted boolean expression */
55497cff
PP
258iexpr : expr
259 { $$ = invert(scalar($1)); }
260 ;
261
891be019 262/* Expression with its own lexical scope */
55497cff 263mexpr : expr
bbce6d69
PP
264 { $$ = $1; intro_my(); }
265 ;
266
267mnexpr : nexpr
268 { $$ = $1; intro_my(); }
55497cff
PP
269 ;
270
271mtexpr : texpr
bbce6d69 272 { $$ = $1; intro_my(); }
55497cff
PP
273 ;
274
275miexpr : iexpr
bbce6d69 276 { $$ = $1; intro_my(); }
55497cff
PP
277 ;
278
891be019 279/* Optional "MAIN:"-style loop labels */
8d063cd8
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280label : /* empty */
281 { $$ = Nullch; }
32c2e4fb 282 | LABEL
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283 ;
284
891be019 285/* Some kind of declaration - does not take part in the parse tree */
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286decl : format
287 { $$ = 0; }
288 | subrout
289 { $$ = 0; }
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290 | mysubrout
291 { $$ = 0; }
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292 | package
293 { $$ = 0; }
a0d0e21e 294 | use
85e6fe83 295 { $$ = 0; }
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296 ;
297
44a8e56a 298format : FORMAT startformsub formname block
a0d0e21e 299 { newFORM($2, $3, $4); }
44a8e56a
PP
300 ;
301
302formname: WORD { $$ = $1; }
303 | /* NULL */ { $$ = Nullop; }
8d063cd8
LW
304 ;
305
891be019 306/* Unimplemented "my sub foo { }" */
09bef843
SB
307mysubrout: MYSUB startsub subname proto subattrlist subbody
308 { newMYSUB($2, $3, $4, $5, $6); }
309 ;
310
891be019 311/* Subroutine definition */
09bef843
SB
312subrout : SUB startsub subname proto subattrlist subbody
313 { newATTRSUB($2, $3, $4, $5, $6); }
28757baa
PP
314 ;
315
fa83b5b6 316startsub: /* NULL */ /* start a regular subroutine scope */
774d564b 317 { $$ = start_subparse(FALSE, 0); }
28757baa
PP
318 ;
319
320startanonsub: /* NULL */ /* start an anonymous subroutine scope */
774d564b 321 { $$ = start_subparse(FALSE, CVf_ANON); }
28757baa
PP
322 ;
323
44a8e56a 324startformsub: /* NULL */ /* start a format subroutine scope */
774d564b 325 { $$ = start_subparse(TRUE, 0); }
44a8e56a
PP
326 ;
327
891be019 328/* Name of a subroutine - must be a bareword, could be special */
2d8e6c8d 329subname : WORD { STRLEN n_a; char *name = SvPV(((SVOP*)$1)->op_sv,n_a);
e858de61 330 if (strEQ(name, "BEGIN") || strEQ(name, "END")
7d30b5c4 331 || strEQ(name, "INIT") || strEQ(name, "CHECK"))
1aff0e91 332 CvSPECIAL_on(PL_compcv);
28757baa 333 $$ = $1; }
a0d0e21e
LW
334 ;
335
891be019 336/* Subroutine prototype */
4633a7c4
LW
337proto : /* NULL */
338 { $$ = Nullop; }
339 | THING
340 ;
28757baa 341
891be019 342/* Optional list of subroutine attributes */
09bef843
SB
343subattrlist: /* NULL */
344 { $$ = Nullop; }
345 | COLONATTR THING
346 { $$ = $2; }
347 | COLONATTR
348 { $$ = Nullop; }
349 ;
350
891be019 351/* List of attributes for a "my" variable declaration */
09bef843
SB
352myattrlist: COLONATTR THING
353 { $$ = $2; }
354 | COLONATTR
355 { $$ = Nullop; }
356 ;
357
891be019 358/* Subroutine body - either null or a block */
28757baa 359subbody : block { $$ = $1; }
3280af22 360 | ';' { $$ = Nullop; PL_expect = XSTATE; }
8d063cd8
LW
361 ;
362
a687059c 363package : PACKAGE WORD ';'
79072805 364 { package($2); }
a687059c
LW
365 ;
366
28757baa 367use : USE startsub
1aff0e91 368 { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
28757baa
PP
369 WORD WORD listexpr ';'
370 { utilize($1, $2, $4, $5, $6); }
85e6fe83
LW
371 ;
372
891be019 373/* Ordinary expressions; logical combinations */
a0d0e21e
LW
374expr : expr ANDOP expr
375 { $$ = newLOGOP(OP_AND, 0, $1, $3); }
376 | expr OROP expr
377 { $$ = newLOGOP($2, 0, $1, $3); }
c963b151
BD
378 | expr DOROP expr
379 { $$ = newLOGOP(OP_DOR, 0, $1, $3); }
fad39ff1 380 | argexpr %prec PREC_LOW
a0d0e21e
LW
381 ;
382
891be019 383/* Expressions are a list of terms joined by commas */
a0d0e21e
LW
384argexpr : argexpr ','
385 { $$ = $1; }
386 | argexpr ',' term
79072805 387 { $$ = append_elem(OP_LIST, $1, $3); }
fad39ff1 388 | term %prec PREC_LOW
8d063cd8
LW
389 ;
390
891be019
SC
391/* List operators */
392listop : LSTOP indirob argexpr /* print $fh @args */
79072805 393 { $$ = convert($1, OPf_STACKED,
a0d0e21e 394 prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); }
891be019 395 | FUNC '(' indirob expr ')' /* print ($fh @args */
79072805 396 { $$ = convert($1, OPf_STACKED,
a0d0e21e 397 prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); }
891be019 398 | term ARROW method '(' listexprcom ')' /* $foo->bar(list) */
4633a7c4 399 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
a0d0e21e 400 append_elem(OP_LIST,
55497cff 401 prepend_elem(OP_LIST, scalar($1), $5),
a0d0e21e 402 newUNOP(OP_METHOD, 0, $3))); }
891be019 403 | term ARROW method /* $foo->bar */
b1524f17
SM
404 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
405 append_elem(OP_LIST, scalar($1),
406 newUNOP(OP_METHOD, 0, $3))); }
891be019 407 | METHOD indirob listexpr /* new Class @args */
4633a7c4 408 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
a0d0e21e 409 append_elem(OP_LIST,
4633a7c4 410 prepend_elem(OP_LIST, $2, $3),
a0d0e21e 411 newUNOP(OP_METHOD, 0, $1))); }
891be019 412 | FUNCMETH indirob '(' listexprcom ')' /* method $object (@args) */
4633a7c4 413 { $$ = convert(OP_ENTERSUB, OPf_STACKED,
a0d0e21e 414 append_elem(OP_LIST,
4633a7c4 415 prepend_elem(OP_LIST, $2, $4),
a0d0e21e 416 newUNOP(OP_METHOD, 0, $1))); }
891be019 417 | LSTOP listexpr /* print @args */
79072805 418 { $$ = convert($1, 0, $2); }
891be019 419 | FUNC '(' listexprcom ')' /* print (@args) */
79072805 420 { $$ = convert($1, 0, $3); }
ecb2f335 421 | LSTOPSUB startanonsub block /* map { foo } ... */
09bef843 422 { $3 = newANONATTRSUB($2, 0, Nullop, $3); }
891be019 423 listexpr %prec LSTOP /* ... @bar */
4633a7c4 424 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
28757baa
PP
425 append_elem(OP_LIST,
426 prepend_elem(OP_LIST, $3, $5), $1)); }
a687059c
LW
427 ;
428
891be019 429/* Names of methods. May use $object->$methodname */
a0d0e21e
LW
430method : METHOD
431 | scalar
432 ;
433
891be019
SC
434/* Some kind of subscripted expression */
435subscripted: star '{' expr ';' '}' /* *main::{something} */
436 /* In this and all the hash accessors, ';' is
437 * provided by the tokeniser */
264e1af3
RGS
438 { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3));
439 PL_expect = XOPERATOR; }
891be019 440 | scalar '[' expr ']' /* $array[$element] */
fad39ff1 441 { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); }
891be019 442 | term ARROW '[' expr ']' /* somearef->[$element] */
fad39ff1
SM
443 { $$ = newBINOP(OP_AELEM, 0,
444 ref(newAVREF($1),OP_RV2AV),
445 scalar($4));}
891be019 446 | subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */
fad39ff1
SM
447 { $$ = newBINOP(OP_AELEM, 0,
448 ref(newAVREF($1),OP_RV2AV),
449 scalar($3));}
891be019 450 | scalar '{' expr ';' '}' /* $foo->{bar();} */
fad39ff1
SM
451 { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
452 PL_expect = XOPERATOR; }
891be019 453 | term ARROW '{' expr ';' '}' /* somehref->{bar();} */
fad39ff1
SM
454 { $$ = newBINOP(OP_HELEM, 0,
455 ref(newHVREF($1),OP_RV2HV),
456 jmaybe($4));
457 PL_expect = XOPERATOR; }
891be019 458 | subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */
fad39ff1
SM
459 { $$ = newBINOP(OP_HELEM, 0,
460 ref(newHVREF($1),OP_RV2HV),
461 jmaybe($3));
462 PL_expect = XOPERATOR; }
891be019 463 | term ARROW '(' ')' /* $subref->() */
fad39ff1
SM
464 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
465 newCVREF(0, scalar($1))); }
891be019 466 | term ARROW '(' expr ')' /* $subref->(@args) */
fad39ff1
SM
467 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
468 append_elem(OP_LIST, $4,
469 newCVREF(0, scalar($1)))); }
470
891be019 471 | subscripted '(' expr ')' /* $foo->{bar}->(@args) */
fad39ff1
SM
472 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
473 append_elem(OP_LIST, $3,
474 newCVREF(0, scalar($1)))); }
891be019 475 | subscripted '(' ')' /* $foo->{bar}->() */
fad39ff1
SM
476 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
477 newCVREF(0, scalar($1))); }
891be019 478 ;
fad39ff1 479
891be019
SC
480/* Binary operators between terms */
481termbinop : term ASSIGNOP term /* $x = $y */
a0d0e21e 482 { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); }
891be019 483 | term POWOP term /* $x ** $y */
79072805 484 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 485 | term MULOP term /* $x * $y, $x x $y */
79072805
LW
486 { if ($2 != OP_REPEAT)
487 scalar($1);
488 $$ = newBINOP($2, 0, $1, scalar($3)); }
891be019 489 | term ADDOP term /* $x + $y */
79072805 490 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 491 | term SHIFTOP term /* $x >> $y, $x << $y */
79072805 492 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 493 | term RELOP term /* $x > $y, etc. */
79072805 494 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 495 | term EQOP term /* $x == $y, $x eq $y */
79072805 496 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 497 | term BITANDOP term /* $x & $y */
79072805 498 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 499 | term BITOROP term /* $x | $y */
79072805 500 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 501 | term DOTDOT term /* $x..$y, $x...$y */
79072805 502 { $$ = newRANGE($2, scalar($1), scalar($3));}
891be019 503 | term ANDAND term /* $x && $y */
463ee0b2 504 { $$ = newLOGOP(OP_AND, 0, $1, $3); }
891be019 505 | term OROR term /* $x || $y */
463ee0b2 506 { $$ = newLOGOP(OP_OR, 0, $1, $3); }
c963b151
BD
507 | term DORDOR term /* $x // $y */
508 { $$ = newLOGOP(OP_DOR, 0, $1, $3); }
891be019 509 | term MATCHOP term /* $x =~ /$y/ */
79072805 510 { $$ = bind_match($2, $1, $3); }
891be019 511 ;
8d063cd8 512
891be019
SC
513/* Unary operators and terms */
514termunop : '-' term %prec UMINUS /* -$x */
79072805 515 { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
891be019 516 | '+' term %prec UMINUS /* +$x */
a687059c 517 { $$ = $2; }
891be019 518 | '!' term /* !$x */
79072805 519 { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
891be019 520 | '~' term /* ~$x */
79072805 521 { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
891be019 522 | term POSTINC /* $x++ */
79072805 523 { $$ = newUNOP(OP_POSTINC, 0,
463ee0b2 524 mod(scalar($1), OP_POSTINC)); }
891be019 525 | term POSTDEC /* $x-- */
79072805 526 { $$ = newUNOP(OP_POSTDEC, 0,
463ee0b2 527 mod(scalar($1), OP_POSTDEC)); }
891be019 528 | PREINC term /* ++$x */
79072805 529 { $$ = newUNOP(OP_PREINC, 0,
463ee0b2 530 mod(scalar($2), OP_PREINC)); }
891be019 531 | PREDEC term /* --$x */
79072805 532 { $$ = newUNOP(OP_PREDEC, 0,
463ee0b2 533 mod(scalar($2), OP_PREDEC)); }
891be019
SC
534
535 ;
536
537/* Constructors for anonymous data */
538anonymous: '[' expr ']'
539 { $$ = newANONLIST($2); }
540 | '[' ']'
541 { $$ = newANONLIST(Nullop); }
542 | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */
ecb2f335 543 { $$ = newANONHASH($2); }
891be019
SC
544 | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */
545 { $$ = newANONHASH(Nullop); }
546 | ANONSUB startanonsub proto subattrlist block %prec '('
547 { $$ = newANONATTRSUB($2, $3, $4, $5); }
548
549 ;
550
551/* Things called with "do" */
552termdo : DO term %prec UNIOP /* do $filename */
553 { $$ = dofile($2); }
554 | DO block %prec '(' /* do { code */
555 { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); }
556 | DO WORD '(' ')' /* do somesub() */
557 { $$ = newUNOP(OP_ENTERSUB,
558 OPf_SPECIAL|OPf_STACKED,
559 prepend_elem(OP_LIST,
560 scalar(newCVREF(
561 (OPpENTERSUB_AMPER<<8),
562 scalar($2)
563 )),Nullop)); dep();}
564 | DO WORD '(' expr ')' /* do somesub(@args) */
565 { $$ = newUNOP(OP_ENTERSUB,
566 OPf_SPECIAL|OPf_STACKED,
567 append_elem(OP_LIST,
568 $4,
569 scalar(newCVREF(
570 (OPpENTERSUB_AMPER<<8),
571 scalar($2)
572 )))); dep();}
573 | DO scalar '(' ')' /* do $subref () */
574 { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
575 prepend_elem(OP_LIST,
576 scalar(newCVREF(0,scalar($2))), Nullop)); dep();}
577 | DO scalar '(' expr ')' /* do $subref (@args) */
578 { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
579 prepend_elem(OP_LIST,
580 $4,
581 scalar(newCVREF(0,scalar($2))))); dep();}
582
583 ;
584
585term : termbinop
586 | termunop
587 | anonymous
588 | termdo
e9bdcc27 589 | term '?' term ':' term
891be019
SC
590 { $$ = newCONDOP(0, $1, $3, $5); }
591 | REFGEN term /* \$x, \@y, \%z */
592 { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); }
09bef843
SB
593 | myattrterm %prec UNIOP
594 { $$ = $1; }
595 | LOCAL term %prec UNIOP
93a17b20 596 { $$ = localize($2,$1); }
a0d0e21e 597 | '(' expr ')'
79072805 598 { $$ = sawparens($2); }
8d063cd8 599 | '(' ')'
8990e307 600 { $$ = sawparens(newNULLLIST()); }
79072805 601 | scalar %prec '('
8d063cd8 602 { $$ = $1; }
79072805 603 | star %prec '('
8d063cd8 604 { $$ = $1; }
79072805 605 | hsh %prec '('
8d063cd8 606 { $$ = $1; }
79072805 607 | ary %prec '('
8d063cd8 608 { $$ = $1; }
891be019 609 | arylen %prec '(' /* $#x, $#{ something } */
79072805 610 { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
fad39ff1
SM
611 | subscripted
612 { $$ = $1; }
891be019 613 | '(' expr ')' '[' expr ']' /* list slice */
79072805 614 { $$ = newSLICEOP(0, $5, $2); }
891be019 615 | '(' ')' '[' expr ']' /* empty list slice! */
79072805 616 { $$ = newSLICEOP(0, $4, Nullop); }
891be019 617 | ary '[' expr ']' /* array slice */
79072805
LW
618 { $$ = prepend_elem(OP_ASLICE,
619 newOP(OP_PUSHMARK, 0),
79072805
LW
620 newLISTOP(OP_ASLICE, 0,
621 list($3),
a0d0e21e 622 ref($1, OP_ASLICE))); }
891be019 623 | ary '{' expr ';' '}' /* @hash{@keys} */
79072805
LW
624 { $$ = prepend_elem(OP_HSLICE,
625 newOP(OP_PUSHMARK, 0),
79072805
LW
626 newLISTOP(OP_HSLICE, 0,
627 list($3),
a0d0e21e 628 ref(oopsHV($1), OP_HSLICE)));
3280af22 629 PL_expect = XOPERATOR; }
79072805
LW
630 | THING %prec '('
631 { $$ = $1; }
891be019 632 | amper /* &foo; */
c07a80fd 633 { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); }
ecb2f335 634 | amper '(' ')' /* &foo() */
a0d0e21e 635 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
891be019 636 | amper '(' expr ')' /* &foo(@args) */
a0d0e21e 637 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
4633a7c4 638 append_elem(OP_LIST, $3, scalar($1))); }
891be019 639 | NOAMP WORD listexpr /* foo(@args) */
a0d0e21e 640 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
a5f75d66 641 append_elem(OP_LIST, $3, scalar($2))); }
891be019 642 | LOOPEX /* loop exiting command (goto, last, dump, etc) */
85e6fe83 643 { $$ = newOP($1, OPf_SPECIAL);
3280af22 644 PL_hints |= HINT_BLOCK_SCOPE; }
a0d0e21e 645 | LOOPEX term
8990e307 646 { $$ = newLOOPEX($1,$2); }
891be019 647 | NOTOP argexpr /* not $foo */
c07a80fd 648 { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
891be019 649 | UNIOP /* Unary op, $_ implied */
79072805 650 { $$ = newOP($1, 0); }
30173ab5 651 | UNIOP block /* eval { foo } */
79072805 652 { $$ = newUNOP($1, 0, $2); }
891be019 653 | UNIOP term /* Unary op */
79072805 654 { $$ = newUNOP($1, 0, $2); }
891be019 655 | UNIOPSUB term /* Sub treated as unop */
4633a7c4
LW
656 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
657 append_elem(OP_LIST, $2, scalar($1))); }
891be019 658 | FUNC0 /* Nullary operator */
79072805 659 { $$ = newOP($1, 0); }
ae986130 660 | FUNC0 '(' ')'
79072805 661 { $$ = newOP($1, 0); }
891be019 662 | FUNC0SUB /* Sub treated as nullop */
28757baa 663 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
4633a7c4 664 scalar($1)); }
891be019 665 | FUNC1 '(' ')' /* not () */
79072805 666 { $$ = newOP($1, OPf_SPECIAL); }
891be019 667 | FUNC1 '(' expr ')' /* not($foo) */
79072805 668 { $$ = newUNOP($1, 0, $3); }
30173ab5 669 | PMFUNC '(' term ')' /* /foo/ */
79072805 670 { $$ = pmruntime($1, $3, Nullop); }
30173ab5 671 | PMFUNC '(' term ',' term ')' /* s/foo/bar/ (or tr) */
79072805
LW
672 { $$ = pmruntime($1, $3, $5); }
673 | WORD
378cc40b 674 | listop
8d063cd8
LW
675 ;
676
891be019 677/* "my" declarations, with optional attributes */
09bef843
SB
678myattrterm: MY myterm myattrlist
679 { $$ = my_attrs($2,$3); }
680 | MY myterm
681 { $$ = localize($2,$1); }
682 ;
683
891be019 684/* Things that can be "my"'d */
09bef843
SB
685myterm : '(' expr ')'
686 { $$ = sawparens($2); }
687 | '(' ')'
688 { $$ = sawparens(newNULLLIST()); }
689 | scalar %prec '('
690 { $$ = $1; }
691 | hsh %prec '('
692 { $$ = $1; }
693 | ary %prec '('
694 { $$ = $1; }
695 ;
696
891be019 697/* Basic list expressions */
fad39ff1 698listexpr: /* NULL */ %prec PREC_LOW
8990e307 699 { $$ = Nullop; }
fad39ff1 700 | argexpr %prec PREC_LOW
a0d0e21e
LW
701 { $$ = $1; }
702 ;
703
704listexprcom: /* NULL */
705 { $$ = Nullop; }
79072805
LW
706 | expr
707 { $$ = $1; }
a0d0e21e
LW
708 | expr ','
709 { $$ = $1; }
79072805
LW
710 ;
711
891be019
SC
712/* A little bit of trickery to make "for my $foo (@bar)" actually be
713 lexical */
55497cff 714my_scalar: scalar
3280af22 715 { PL_in_my = 0; $$ = my($1); }
55497cff
PP
716 ;
717
79072805 718amper : '&' indirob
c07a80fd 719 { $$ = newCVREF($1,$2); }
a687059c
LW
720 ;
721
79072805
LW
722scalar : '$' indirob
723 { $$ = newSVREF($2); }
a687059c
LW
724 ;
725
79072805
LW
726ary : '@' indirob
727 { $$ = newAVREF($2); }
728 ;
729
730hsh : '%' indirob
731 { $$ = newHVREF($2); }
732 ;
733
734arylen : DOLSHARP indirob
735 { $$ = newAVREF($2); }
736 ;
737
738star : '*' indirob
a0d0e21e 739 { $$ = newGVREF(0,$2); }
79072805
LW
740 ;
741
891be019 742/* Indirect objects */
79072805
LW
743indirob : WORD
744 { $$ = scalar($1); }
fad39ff1 745 | scalar %prec PREC_LOW
463ee0b2 746 { $$ = scalar($1); }
79072805 747 | block
a0d0e21e 748 { $$ = scope($1); }
79072805 749
93a17b20
LW
750 | PRIVATEREF
751 { $$ = $1; }
8d063cd8 752 ;