Commit | Line | Data |
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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 | 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 | 103 | prog : progstart |
ae986130 | 104 | /*CONTINUED*/ lineseq |
ecb2f335 | 105 | { $$ = $1; newPROG(block_end($1,$2)); } |
8d063cd8 LW |
106 | ; |
107 | ||
891be019 | 108 | /* An ordinary block */ |
a687059c | 109 | block : '{' remember lineseq '}' |
3280af22 | 110 | { if (PL_copline > (line_t)$1) |
eb160463 | 111 | PL_copline = (line_t)$1; |
36477c24 | 112 | $$ = block_end($2, $3); } |
a0d0e21e LW |
113 | ; |
114 | ||
55497cff | 115 | remember: /* NULL */ /* start a full lexical scope */ |
116 | { $$ = block_start(TRUE); } | |
117 | ; | |
118 | ||
0d863452 RH |
119 | mydefsv: /* NULL */ /* lexicalize $_ */ |
120 | { $$ = (I32) allocmy("$_"); } | |
121 | ; | |
122 | ||
ecb2f335 NIS |
123 | progstart: |
124 | { | |
ecb2f335 NIS |
125 | PL_expect = XSTATE; $$ = block_start(TRUE); |
126 | } | |
127 | ; | |
128 | ||
129 | ||
bbce6d69 | 130 | mblock : '{' mremember lineseq '}' |
3280af22 | 131 | { if (PL_copline > (line_t)$1) |
eb160463 | 132 | PL_copline = (line_t)$1; |
36477c24 | 133 | $$ = block_end($2, $3); } |
55497cff | 134 | ; |
135 | ||
136 | mremember: /* NULL */ /* start a partial lexical scope */ | |
137 | { $$ = block_start(FALSE); } | |
8d063cd8 LW |
138 | ; |
139 | ||
500bedb6 DM |
140 | savescope: /* NULL */ /* remember stack pos in case of error */ |
141 | { $$ = PL_savestack_ix; } | |
142 | ||
891be019 | 143 | /* A collection of "lines" in the program */ |
8d063cd8 | 144 | lineseq : /* NULL */ |
79072805 LW |
145 | { $$ = Nullop; } |
146 | | lineseq decl | |
147 | { $$ = $1; } | |
500bedb6 DM |
148 | | lineseq savescope line |
149 | { LEAVE_SCOPE($2); | |
150 | $$ = append_list(OP_LINESEQ, | |
151 | (LISTOP*)$1, (LISTOP*)$3); | |
3280af22 | 152 | PL_pad_reset_pending = TRUE; |
500bedb6 | 153 | if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; } |
8d063cd8 LW |
154 | ; |
155 | ||
891be019 | 156 | /* A "line" in the program */ |
79072805 LW |
157 | line : label cond |
158 | { $$ = 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 | { $$ = newSTATEOP(0, $1, $2); |
3280af22 | 175 | PL_expect = XSTATE; } |
8d063cd8 LW |
176 | ; |
177 | ||
891be019 | 178 | /* An expression which may have a side-effect */ |
a687059c | 179 | sideff : error |
79072805 | 180 | { $$ = 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 | 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 |
197 | else : /* 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 | $$ = newCONDOP(0, $3, scope($5), $6); |
3280af22 | 204 | PL_hints |= HINT_BLOCK_SCOPE; } |
79072805 LW |
205 | ; |
206 | ||
891be019 | 207 | /* Real conditional expressions */ |
55497cff | 208 | cond : IF '(' remember mexpr ')' mblock else |
eb160463 | 209 | { PL_copline = (line_t)$1; |
36477c24 | 210 | $$ = 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 | $$ = block_end($3, |
bbce6d69 | 215 | newCONDOP(0, $4, scope($6), $7)); } |
79072805 LW |
216 | ; |
217 | ||
0d863452 RH |
218 | /* Cases for a switch statement */ |
219 | case : WHEN '(' remember mexpr ')' mblock | |
220 | { $$ = block_end($3, | |
221 | newWHENOP($4, scope($6))); } | |
222 | | DEFAULT block | |
223 | { $$ = newWHENOP(0, scope($2)); } | |
224 | ; | |
225 | ||
891be019 | 226 | /* Continue blocks */ |
79072805 LW |
227 | cont : /* NULL */ |
228 | { $$ = Nullop; } | |
229 | | CONTINUE block | |
230 | { $$ = scope($2); } | |
231 | ; | |
232 | ||
891be019 | 233 | /* Loops: while, until, for, and a bare block */ |
a034e688 | 234 | loop : label WHILE '(' remember texpr ')' mintro mblock cont |
eb160463 | 235 | { PL_copline = (line_t)$2; |
36477c24 | 236 | $$ = 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 | { $$ = block_end($5, |
eb160463 | 251 | newFOROP(0, $1, (line_t)$2, mod($3, OP_ENTERLOOP), |
bbce6d69 | 252 | $6, $8, $9)); } |
253 | | label FOR '(' remember mexpr ')' mblock cont | |
36477c24 | 254 | { $$ = 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 | $$ = block_end($4, forop); } | |
79072805 | 273 | | label block cont /* a block is a loop that happens once */ |
fb73857a | 274 | { $$ = 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 */ |
280 | switch : label GIVEN '(' remember mydefsv mexpr ')' mblock | |
281 | { PL_copline = (line_t) $2; | |
282 | $$ = block_end($4, | |
283 | newSTATEOP(0, $1, | |
284 | newGIVENOP($6, scope($8), | |
285 | (PADOFFSET) $5) )); } | |
286 | ; | |
287 | ||
a034e688 DM |
288 | /* determine whether there are any new my declarations */ |
289 | mintro : /* NULL */ | |
290 | { $$ = (PL_min_intro_pending && | |
291 | PL_max_intro_pending >= PL_min_intro_pending); | |
292 | intro_my(); } | |
293 | ||
891be019 | 294 | /* Normal expression */ |
8d063cd8 | 295 | nexpr : /* NULL */ |
79072805 | 296 | { $$ = Nullop; } |
8d063cd8 LW |
297 | | sideff |
298 | ; | |
299 | ||
891be019 | 300 | /* Boolean expression */ |
8d063cd8 | 301 | texpr : /* NULL means true */ |
b73d6f50 | 302 | { (void)scan_num("1", &yylval); $$ = yylval.opval; } |
8d063cd8 LW |
303 | | expr |
304 | ; | |
305 | ||
891be019 | 306 | /* Inverted boolean expression */ |
55497cff | 307 | iexpr : expr |
308 | { $$ = invert(scalar($1)); } | |
309 | ; | |
310 | ||
891be019 | 311 | /* Expression with its own lexical scope */ |
55497cff | 312 | mexpr : expr |
bbce6d69 | 313 | { $$ = $1; intro_my(); } |
314 | ; | |
315 | ||
316 | mnexpr : nexpr | |
317 | { $$ = $1; intro_my(); } | |
55497cff | 318 | ; |
319 | ||
55497cff | 320 | miexpr : iexpr |
bbce6d69 | 321 | { $$ = $1; intro_my(); } |
55497cff | 322 | ; |
323 | ||
891be019 | 324 | /* Optional "MAIN:"-style loop labels */ |
8d063cd8 LW |
325 | label : /* empty */ |
326 | { $$ = Nullch; } | |
32c2e4fb | 327 | | LABEL |
8d063cd8 LW |
328 | ; |
329 | ||
891be019 | 330 | /* Some kind of declaration - does not take part in the parse tree */ |
8d063cd8 LW |
331 | decl : format |
332 | { $$ = 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 | 343 | format : FORMAT startformsub formname block |
a8ff2fa6 DM |
344 | { SvREFCNT_inc(PL_compcv); |
345 | newFORM($2, $3, $4); } | |
44a8e56a | 346 | ; |
347 | ||
348 | formname: WORD { $$ = $1; } | |
349 | | /* NULL */ { $$ = Nullop; } | |
8d063cd8 LW |
350 | ; |
351 | ||
891be019 | 352 | /* Unimplemented "my sub foo { }" */ |
09bef843 | 353 | mysubrout: 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 | 359 | subrout : SUB startsub subname proto subattrlist subbody |
a8ff2fa6 DM |
360 | { SvREFCNT_inc(PL_compcv); |
361 | newATTRSUB($2, $3, $4, $5, $6); } | |
28757baa | 362 | ; |
363 | ||
fa83b5b6 | 364 | startsub: /* NULL */ /* start a regular subroutine scope */ |
a8ff2fa6 DM |
365 | { $$ = start_subparse(FALSE, 0); |
366 | SAVEFREESV(PL_compcv); } | |
28757baa | 367 | ; |
368 | ||
369 | startanonsub: /* NULL */ /* start an anonymous subroutine scope */ | |
a8ff2fa6 DM |
370 | { $$ = start_subparse(FALSE, CVf_ANON); |
371 | SAVEFREESV(PL_compcv); } | |
28757baa | 372 | ; |
373 | ||
44a8e56a | 374 | startformsub: /* NULL */ /* start a format subroutine scope */ |
a8ff2fa6 DM |
375 | { $$ = start_subparse(TRUE, 0); |
376 | SAVEFREESV(PL_compcv); } | |
44a8e56a | 377 | ; |
378 | ||
891be019 | 379 | /* Name of a subroutine - must be a bareword, could be special */ |
2596d9fe | 380 | subname : WORD { const char *const name = SvPV_nolen_const(((SVOP*)$1)->op_sv); |
e858de61 | 381 | if (strEQ(name, "BEGIN") || strEQ(name, "END") |
3c10abe3 AG |
382 | || strEQ(name, "INIT") || strEQ(name, "CHECK") |
383 | || strEQ(name, "UNITCHECK")) | |
1aff0e91 | 384 | CvSPECIAL_on(PL_compcv); |
28757baa | 385 | $$ = $1; } |
a0d0e21e LW |
386 | ; |
387 | ||
891be019 | 388 | /* Subroutine prototype */ |
4633a7c4 LW |
389 | proto : /* NULL */ |
390 | { $$ = Nullop; } | |
391 | | THING | |
392 | ; | |
28757baa | 393 | |
891be019 | 394 | /* Optional list of subroutine attributes */ |
09bef843 SB |
395 | subattrlist: /* NULL */ |
396 | { $$ = Nullop; } | |
397 | | COLONATTR THING | |
398 | { $$ = $2; } | |
399 | | COLONATTR | |
400 | { $$ = Nullop; } | |
401 | ; | |
402 | ||
891be019 | 403 | /* List of attributes for a "my" variable declaration */ |
09bef843 SB |
404 | myattrlist: COLONATTR THING |
405 | { $$ = $2; } | |
406 | | COLONATTR | |
407 | { $$ = Nullop; } | |
408 | ; | |
409 | ||
891be019 | 410 | /* Subroutine body - either null or a block */ |
28757baa | 411 | subbody : block { $$ = $1; } |
3280af22 | 412 | | ';' { $$ = Nullop; PL_expect = XSTATE; } |
8d063cd8 LW |
413 | ; |
414 | ||
a687059c | 415 | package : PACKAGE WORD ';' |
79072805 | 416 | { package($2); } |
a687059c LW |
417 | ; |
418 | ||
28757baa | 419 | use : USE startsub |
1aff0e91 | 420 | { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ } |
28757baa | 421 | WORD WORD listexpr ';' |
a8ff2fa6 DM |
422 | { SvREFCNT_inc(PL_compcv); |
423 | utilize($1, $2, $4, $5, $6); } | |
85e6fe83 LW |
424 | ; |
425 | ||
891be019 | 426 | /* Ordinary expressions; logical combinations */ |
a0d0e21e LW |
427 | expr : expr ANDOP expr |
428 | { $$ = newLOGOP(OP_AND, 0, $1, $3); } | |
429 | | expr OROP expr | |
430 | { $$ = newLOGOP($2, 0, $1, $3); } | |
c963b151 BD |
431 | | expr DOROP expr |
432 | { $$ = newLOGOP(OP_DOR, 0, $1, $3); } | |
fad39ff1 | 433 | | argexpr %prec PREC_LOW |
a0d0e21e LW |
434 | ; |
435 | ||
891be019 | 436 | /* Expressions are a list of terms joined by commas */ |
a0d0e21e LW |
437 | argexpr : argexpr ',' |
438 | { $$ = $1; } | |
439 | | argexpr ',' term | |
79072805 | 440 | { $$ = append_elem(OP_LIST, $1, $3); } |
fad39ff1 | 441 | | term %prec PREC_LOW |
8d063cd8 LW |
442 | ; |
443 | ||
891be019 | 444 | /* List operators */ |
ad4673e5 | 445 | listop : LSTOP indirob argexpr /* map {...} @args or print $fh @args */ |
79072805 | 446 | { $$ = convert($1, OPf_STACKED, |
a0d0e21e | 447 | prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); } |
891be019 | 448 | | FUNC '(' indirob expr ')' /* print ($fh @args */ |
79072805 | 449 | { $$ = convert($1, OPf_STACKED, |
a0d0e21e | 450 | prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); } |
891be019 | 451 | | term ARROW method '(' listexprcom ')' /* $foo->bar(list) */ |
4633a7c4 | 452 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e | 453 | append_elem(OP_LIST, |
55497cff | 454 | prepend_elem(OP_LIST, scalar($1), $5), |
a0d0e21e | 455 | newUNOP(OP_METHOD, 0, $3))); } |
891be019 | 456 | | term ARROW method /* $foo->bar */ |
b1524f17 SM |
457 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
458 | append_elem(OP_LIST, scalar($1), | |
459 | newUNOP(OP_METHOD, 0, $3))); } | |
891be019 | 460 | | METHOD indirob listexpr /* new Class @args */ |
4633a7c4 | 461 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e | 462 | append_elem(OP_LIST, |
4633a7c4 | 463 | prepend_elem(OP_LIST, $2, $3), |
a0d0e21e | 464 | newUNOP(OP_METHOD, 0, $1))); } |
891be019 | 465 | | FUNCMETH indirob '(' listexprcom ')' /* method $object (@args) */ |
4633a7c4 | 466 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e | 467 | append_elem(OP_LIST, |
4633a7c4 | 468 | prepend_elem(OP_LIST, $2, $4), |
a0d0e21e | 469 | newUNOP(OP_METHOD, 0, $1))); } |
891be019 | 470 | | LSTOP listexpr /* print @args */ |
79072805 | 471 | { $$ = convert($1, 0, $2); } |
891be019 | 472 | | FUNC '(' listexprcom ')' /* print (@args) */ |
79072805 | 473 | { $$ = convert($1, 0, $3); } |
ad4673e5 | 474 | | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */ |
a8ff2fa6 DM |
475 | { SvREFCNT_inc(PL_compcv); |
476 | $3 = newANONATTRSUB($2, 0, Nullop, $3); } | |
891be019 | 477 | listexpr %prec LSTOP /* ... @bar */ |
4633a7c4 | 478 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
28757baa | 479 | append_elem(OP_LIST, |
480 | prepend_elem(OP_LIST, $3, $5), $1)); } | |
a687059c LW |
481 | ; |
482 | ||
891be019 | 483 | /* Names of methods. May use $object->$methodname */ |
a0d0e21e LW |
484 | method : METHOD |
485 | | scalar | |
486 | ; | |
487 | ||
891be019 SC |
488 | /* Some kind of subscripted expression */ |
489 | subscripted: star '{' expr ';' '}' /* *main::{something} */ | |
490 | /* In this and all the hash accessors, ';' is | |
491 | * provided by the tokeniser */ | |
264e1af3 RGS |
492 | { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); |
493 | PL_expect = XOPERATOR; } | |
891be019 | 494 | | scalar '[' expr ']' /* $array[$element] */ |
fad39ff1 | 495 | { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); } |
891be019 | 496 | | term ARROW '[' expr ']' /* somearef->[$element] */ |
fad39ff1 SM |
497 | { $$ = newBINOP(OP_AELEM, 0, |
498 | ref(newAVREF($1),OP_RV2AV), | |
499 | scalar($4));} | |
891be019 | 500 | | subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */ |
fad39ff1 SM |
501 | { $$ = newBINOP(OP_AELEM, 0, |
502 | ref(newAVREF($1),OP_RV2AV), | |
503 | scalar($3));} | |
891be019 | 504 | | scalar '{' expr ';' '}' /* $foo->{bar();} */ |
fad39ff1 SM |
505 | { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3)); |
506 | PL_expect = XOPERATOR; } | |
891be019 | 507 | | term ARROW '{' expr ';' '}' /* somehref->{bar();} */ |
fad39ff1 SM |
508 | { $$ = newBINOP(OP_HELEM, 0, |
509 | ref(newHVREF($1),OP_RV2HV), | |
510 | jmaybe($4)); | |
511 | PL_expect = XOPERATOR; } | |
891be019 | 512 | | subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */ |
fad39ff1 SM |
513 | { $$ = newBINOP(OP_HELEM, 0, |
514 | ref(newHVREF($1),OP_RV2HV), | |
515 | jmaybe($3)); | |
516 | PL_expect = XOPERATOR; } | |
891be019 | 517 | | term ARROW '(' ')' /* $subref->() */ |
fad39ff1 SM |
518 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
519 | newCVREF(0, scalar($1))); } | |
891be019 | 520 | | term ARROW '(' expr ')' /* $subref->(@args) */ |
fad39ff1 SM |
521 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
522 | append_elem(OP_LIST, $4, | |
523 | newCVREF(0, scalar($1)))); } | |
524 | ||
891be019 | 525 | | subscripted '(' expr ')' /* $foo->{bar}->(@args) */ |
fad39ff1 SM |
526 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
527 | append_elem(OP_LIST, $3, | |
528 | newCVREF(0, scalar($1)))); } | |
891be019 | 529 | | subscripted '(' ')' /* $foo->{bar}->() */ |
fad39ff1 SM |
530 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
531 | newCVREF(0, scalar($1))); } | |
9a9798c2 YST |
532 | | '(' expr ')' '[' expr ']' /* list slice */ |
533 | { $$ = newSLICEOP(0, $5, $2); } | |
534 | | '(' ')' '[' expr ']' /* empty list slice! */ | |
535 | { $$ = newSLICEOP(0, $4, Nullop); } | |
891be019 | 536 | ; |
fad39ff1 | 537 | |
891be019 SC |
538 | /* Binary operators between terms */ |
539 | termbinop : term ASSIGNOP term /* $x = $y */ | |
a0d0e21e | 540 | { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); } |
891be019 | 541 | | term POWOP term /* $x ** $y */ |
79072805 | 542 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 543 | | term MULOP term /* $x * $y, $x x $y */ |
79072805 LW |
544 | { if ($2 != OP_REPEAT) |
545 | scalar($1); | |
546 | $$ = newBINOP($2, 0, $1, scalar($3)); } | |
891be019 | 547 | | term ADDOP term /* $x + $y */ |
79072805 | 548 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 549 | | term SHIFTOP term /* $x >> $y, $x << $y */ |
79072805 | 550 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 551 | | term RELOP term /* $x > $y, etc. */ |
79072805 | 552 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 553 | | term EQOP term /* $x == $y, $x eq $y */ |
79072805 | 554 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 555 | | term BITANDOP term /* $x & $y */ |
79072805 | 556 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 557 | | term BITOROP term /* $x | $y */ |
79072805 | 558 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 559 | | term DOTDOT term /* $x..$y, $x...$y */ |
79072805 | 560 | { $$ = newRANGE($2, scalar($1), scalar($3));} |
891be019 | 561 | | term ANDAND term /* $x && $y */ |
463ee0b2 | 562 | { $$ = newLOGOP(OP_AND, 0, $1, $3); } |
891be019 | 563 | | term OROR term /* $x || $y */ |
463ee0b2 | 564 | { $$ = newLOGOP(OP_OR, 0, $1, $3); } |
c963b151 BD |
565 | | term DORDOR term /* $x // $y */ |
566 | { $$ = newLOGOP(OP_DOR, 0, $1, $3); } | |
891be019 | 567 | | term MATCHOP term /* $x =~ /$y/ */ |
79072805 | 568 | { $$ = bind_match($2, $1, $3); } |
891be019 | 569 | ; |
8d063cd8 | 570 | |
891be019 SC |
571 | /* Unary operators and terms */ |
572 | termunop : '-' term %prec UMINUS /* -$x */ | |
79072805 | 573 | { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); } |
891be019 | 574 | | '+' term %prec UMINUS /* +$x */ |
a687059c | 575 | { $$ = $2; } |
891be019 | 576 | | '!' term /* !$x */ |
79072805 | 577 | { $$ = newUNOP(OP_NOT, 0, scalar($2)); } |
891be019 | 578 | | '~' term /* ~$x */ |
79072805 | 579 | { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));} |
891be019 | 580 | | term POSTINC /* $x++ */ |
79072805 | 581 | { $$ = newUNOP(OP_POSTINC, 0, |
463ee0b2 | 582 | mod(scalar($1), OP_POSTINC)); } |
891be019 | 583 | | term POSTDEC /* $x-- */ |
79072805 | 584 | { $$ = newUNOP(OP_POSTDEC, 0, |
463ee0b2 | 585 | mod(scalar($1), OP_POSTDEC)); } |
891be019 | 586 | | PREINC term /* ++$x */ |
79072805 | 587 | { $$ = newUNOP(OP_PREINC, 0, |
463ee0b2 | 588 | mod(scalar($2), OP_PREINC)); } |
891be019 | 589 | | PREDEC term /* --$x */ |
79072805 | 590 | { $$ = newUNOP(OP_PREDEC, 0, |
463ee0b2 | 591 | mod(scalar($2), OP_PREDEC)); } |
891be019 SC |
592 | |
593 | ; | |
594 | ||
595 | /* Constructors for anonymous data */ | |
596 | anonymous: '[' expr ']' | |
597 | { $$ = newANONLIST($2); } | |
598 | | '[' ']' | |
599 | { $$ = newANONLIST(Nullop); } | |
600 | | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */ | |
ecb2f335 | 601 | { $$ = newANONHASH($2); } |
891be019 SC |
602 | | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */ |
603 | { $$ = newANONHASH(Nullop); } | |
604 | | ANONSUB startanonsub proto subattrlist block %prec '(' | |
a8ff2fa6 DM |
605 | { SvREFCNT_inc(PL_compcv); |
606 | $$ = newANONATTRSUB($2, $3, $4, $5); } | |
891be019 SC |
607 | |
608 | ; | |
609 | ||
610 | /* Things called with "do" */ | |
611 | termdo : DO term %prec UNIOP /* do $filename */ | |
850e8516 | 612 | { $$ = dofile($2, $1); } |
891be019 SC |
613 | | DO block %prec '(' /* do { code */ |
614 | { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); } | |
615 | | DO WORD '(' ')' /* do somesub() */ | |
616 | { $$ = newUNOP(OP_ENTERSUB, | |
617 | OPf_SPECIAL|OPf_STACKED, | |
618 | prepend_elem(OP_LIST, | |
619 | scalar(newCVREF( | |
620 | (OPpENTERSUB_AMPER<<8), | |
621 | scalar($2) | |
622 | )),Nullop)); dep();} | |
623 | | DO WORD '(' expr ')' /* do somesub(@args) */ | |
624 | { $$ = newUNOP(OP_ENTERSUB, | |
625 | OPf_SPECIAL|OPf_STACKED, | |
626 | append_elem(OP_LIST, | |
627 | $4, | |
628 | scalar(newCVREF( | |
629 | (OPpENTERSUB_AMPER<<8), | |
630 | scalar($2) | |
631 | )))); dep();} | |
632 | | DO scalar '(' ')' /* do $subref () */ | |
633 | { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED, | |
634 | prepend_elem(OP_LIST, | |
635 | scalar(newCVREF(0,scalar($2))), Nullop)); dep();} | |
636 | | DO scalar '(' expr ')' /* do $subref (@args) */ | |
637 | { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED, | |
638 | prepend_elem(OP_LIST, | |
639 | $4, | |
640 | scalar(newCVREF(0,scalar($2))))); dep();} | |
641 | ||
642 | ; | |
643 | ||
644 | term : termbinop | |
645 | | termunop | |
646 | | anonymous | |
647 | | termdo | |
e9bdcc27 | 648 | | term '?' term ':' term |
891be019 SC |
649 | { $$ = newCONDOP(0, $1, $3, $5); } |
650 | | REFGEN term /* \$x, \@y, \%z */ | |
651 | { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); } | |
09bef843 SB |
652 | | myattrterm %prec UNIOP |
653 | { $$ = $1; } | |
654 | | LOCAL term %prec UNIOP | |
93a17b20 | 655 | { $$ = localize($2,$1); } |
a0d0e21e | 656 | | '(' expr ')' |
79072805 | 657 | { $$ = sawparens($2); } |
8d063cd8 | 658 | | '(' ')' |
8990e307 | 659 | { $$ = sawparens(newNULLLIST()); } |
79072805 | 660 | | scalar %prec '(' |
8d063cd8 | 661 | { $$ = $1; } |
79072805 | 662 | | star %prec '(' |
8d063cd8 | 663 | { $$ = $1; } |
79072805 | 664 | | hsh %prec '(' |
8d063cd8 | 665 | { $$ = $1; } |
79072805 | 666 | | ary %prec '(' |
8d063cd8 | 667 | { $$ = $1; } |
891be019 | 668 | | arylen %prec '(' /* $#x, $#{ something } */ |
79072805 | 669 | { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));} |
fad39ff1 SM |
670 | | subscripted |
671 | { $$ = $1; } | |
891be019 | 672 | | ary '[' expr ']' /* array slice */ |
79072805 LW |
673 | { $$ = prepend_elem(OP_ASLICE, |
674 | newOP(OP_PUSHMARK, 0), | |
79072805 LW |
675 | newLISTOP(OP_ASLICE, 0, |
676 | list($3), | |
a0d0e21e | 677 | ref($1, OP_ASLICE))); } |
891be019 | 678 | | ary '{' expr ';' '}' /* @hash{@keys} */ |
79072805 LW |
679 | { $$ = prepend_elem(OP_HSLICE, |
680 | newOP(OP_PUSHMARK, 0), | |
79072805 LW |
681 | newLISTOP(OP_HSLICE, 0, |
682 | list($3), | |
a0d0e21e | 683 | ref(oopsHV($1), OP_HSLICE))); |
3280af22 | 684 | PL_expect = XOPERATOR; } |
79072805 LW |
685 | | THING %prec '(' |
686 | { $$ = $1; } | |
891be019 | 687 | | amper /* &foo; */ |
c07a80fd | 688 | { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); } |
ecb2f335 | 689 | | amper '(' ')' /* &foo() */ |
a0d0e21e | 690 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); } |
891be019 | 691 | | amper '(' expr ')' /* &foo(@args) */ |
a0d0e21e | 692 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
4633a7c4 | 693 | append_elem(OP_LIST, $3, scalar($1))); } |
891be019 | 694 | | NOAMP WORD listexpr /* foo(@args) */ |
a0d0e21e | 695 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
a5f75d66 | 696 | append_elem(OP_LIST, $3, scalar($2))); } |
891be019 | 697 | | LOOPEX /* loop exiting command (goto, last, dump, etc) */ |
85e6fe83 | 698 | { $$ = newOP($1, OPf_SPECIAL); |
3280af22 | 699 | PL_hints |= HINT_BLOCK_SCOPE; } |
a0d0e21e | 700 | | LOOPEX term |
8990e307 | 701 | { $$ = newLOOPEX($1,$2); } |
891be019 | 702 | | NOTOP argexpr /* not $foo */ |
c07a80fd | 703 | { $$ = newUNOP(OP_NOT, 0, scalar($2)); } |
891be019 | 704 | | UNIOP /* Unary op, $_ implied */ |
79072805 | 705 | { $$ = newOP($1, 0); } |
30173ab5 | 706 | | UNIOP block /* eval { foo } */ |
79072805 | 707 | { $$ = newUNOP($1, 0, $2); } |
891be019 | 708 | | UNIOP term /* Unary op */ |
79072805 | 709 | { $$ = newUNOP($1, 0, $2); } |
a72a1c8b RGS |
710 | | REQUIRE /* require, $_ implied */ |
711 | { $$ = newOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0); } | |
712 | | REQUIRE term /* require Foo */ | |
713 | { $$ = newUNOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0, $2); } | |
3cd0a11a RGS |
714 | | UNIOPSUB |
715 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); } | |
891be019 | 716 | | UNIOPSUB term /* Sub treated as unop */ |
4633a7c4 LW |
717 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
718 | append_elem(OP_LIST, $2, scalar($1))); } | |
891be019 | 719 | | FUNC0 /* Nullary operator */ |
79072805 | 720 | { $$ = newOP($1, 0); } |
ae986130 | 721 | | FUNC0 '(' ')' |
79072805 | 722 | { $$ = newOP($1, 0); } |
891be019 | 723 | | FUNC0SUB /* Sub treated as nullop */ |
28757baa | 724 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
4633a7c4 | 725 | scalar($1)); } |
891be019 | 726 | | FUNC1 '(' ')' /* not () */ |
a758b0b5 MHM |
727 | { $$ = $1 == OP_NOT ? newUNOP($1, 0, newSVOP(OP_CONST, 0, newSViv(0))) |
728 | : newOP($1, OPf_SPECIAL); } | |
891be019 | 729 | | FUNC1 '(' expr ')' /* not($foo) */ |
79072805 | 730 | { $$ = newUNOP($1, 0, $3); } |
131b3ad0 DM |
731 | | PMFUNC '(' argexpr ')' /* m//, s///, tr/// */ |
732 | { $$ = pmruntime($1, $3, 1); } | |
79072805 | 733 | | WORD |
378cc40b | 734 | | listop |
8d063cd8 LW |
735 | ; |
736 | ||
891be019 | 737 | /* "my" declarations, with optional attributes */ |
09bef843 SB |
738 | myattrterm: MY myterm myattrlist |
739 | { $$ = my_attrs($2,$3); } | |
740 | | MY myterm | |
741 | { $$ = localize($2,$1); } | |
742 | ; | |
743 | ||
891be019 | 744 | /* Things that can be "my"'d */ |
09bef843 SB |
745 | myterm : '(' expr ')' |
746 | { $$ = sawparens($2); } | |
747 | | '(' ')' | |
748 | { $$ = sawparens(newNULLLIST()); } | |
749 | | scalar %prec '(' | |
750 | { $$ = $1; } | |
751 | | hsh %prec '(' | |
752 | { $$ = $1; } | |
753 | | ary %prec '(' | |
754 | { $$ = $1; } | |
755 | ; | |
756 | ||
891be019 | 757 | /* Basic list expressions */ |
fad39ff1 | 758 | listexpr: /* NULL */ %prec PREC_LOW |
8990e307 | 759 | { $$ = Nullop; } |
fad39ff1 | 760 | | argexpr %prec PREC_LOW |
a0d0e21e LW |
761 | { $$ = $1; } |
762 | ; | |
763 | ||
764 | listexprcom: /* NULL */ | |
765 | { $$ = Nullop; } | |
79072805 LW |
766 | | expr |
767 | { $$ = $1; } | |
a0d0e21e LW |
768 | | expr ',' |
769 | { $$ = $1; } | |
79072805 LW |
770 | ; |
771 | ||
891be019 SC |
772 | /* A little bit of trickery to make "for my $foo (@bar)" actually be |
773 | lexical */ | |
55497cff | 774 | my_scalar: scalar |
3280af22 | 775 | { PL_in_my = 0; $$ = my($1); } |
55497cff | 776 | ; |
777 | ||
79072805 | 778 | amper : '&' indirob |
c07a80fd | 779 | { $$ = newCVREF($1,$2); } |
a687059c LW |
780 | ; |
781 | ||
79072805 LW |
782 | scalar : '$' indirob |
783 | { $$ = newSVREF($2); } | |
a687059c LW |
784 | ; |
785 | ||
79072805 LW |
786 | ary : '@' indirob |
787 | { $$ = newAVREF($2); } | |
788 | ; | |
789 | ||
790 | hsh : '%' indirob | |
791 | { $$ = newHVREF($2); } | |
792 | ; | |
793 | ||
794 | arylen : DOLSHARP indirob | |
795 | { $$ = newAVREF($2); } | |
796 | ; | |
797 | ||
798 | star : '*' indirob | |
a0d0e21e | 799 | { $$ = newGVREF(0,$2); } |
79072805 LW |
800 | ; |
801 | ||
891be019 | 802 | /* Indirect objects */ |
79072805 LW |
803 | indirob : WORD |
804 | { $$ = scalar($1); } | |
fad39ff1 | 805 | | scalar %prec PREC_LOW |
463ee0b2 | 806 | { $$ = scalar($1); } |
79072805 | 807 | | block |
a0d0e21e | 808 | { $$ = scope($1); } |
79072805 | 809 | |
93a17b20 LW |
810 | | PRIVATEREF |
811 | { $$ = $1; } | |
8d063cd8 | 812 | ; |