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; | |
33 | OP *opval; | |
34 | GV *gvval; | |
8d063cd8 LW |
35 | } |
36 | ||
fad39ff1 | 37 | %token <ival> '{' |
f0fcb552 | 38 | |
a0d0e21e | 39 | %token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF |
4633a7c4 | 40 | %token <opval> FUNC0SUB UNIOPSUB LSTOPSUB |
79072805 | 41 | %token <pval> LABEL |
a0d0e21e | 42 | %token <ival> FORMAT SUB ANONSUB PACKAGE USE |
79072805 LW |
43 | %token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR |
44 | %token <ival> LOOPEX DOTDOT | |
36477c24 | 45 | %token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP |
79072805 | 46 | %token <ival> RELOP EQOP MULOP ADDOP |
55497cff | 47 | %token <ival> DOLSHARP DO HASHBRACK NOAMP |
09bef843 SB |
48 | %token <ival> LOCAL MY MYSUB |
49 | %token COLONATTR | |
79072805 | 50 | |
a034e688 | 51 | %type <ival> prog decl format startsub startanonsub startformsub mintro |
500bedb6 | 52 | %type <ival> progstart remember mremember '&' savescope |
bbce6d69 | 53 | %type <opval> block mblock lineseq line loop cond else |
fad39ff1 | 54 | %type <opval> expr term subscripted scalar ary hsh arylen star amper sideff |
a034e688 | 55 | %type <opval> argexpr nexpr texpr iexpr mexpr mnexpr miexpr |
44a8e56a | 56 | %type <opval> listexpr listexprcom indirob listop method |
57 | %type <opval> formname subname proto subbody cont my_scalar | |
09bef843 | 58 | %type <opval> subattrlist myattrlist mysubrout myattrterm myterm |
891be019 | 59 | %type <opval> termbinop termunop anonymous termdo |
79072805 | 60 | %type <pval> label |
79072805 | 61 | |
fad39ff1 SM |
62 | %nonassoc PREC_LOW |
63 | %nonassoc LOOPEX | |
64 | ||
c963b151 | 65 | %left <ival> OROP DOROP |
463ee0b2 | 66 | %left ANDOP |
c07a80fd | 67 | %right NOTOP |
36477c24 | 68 | %nonassoc LSTOP LSTOPSUB |
8d063cd8 | 69 | %left ',' |
a0d0e21e | 70 | %right <ival> ASSIGNOP |
8d063cd8 LW |
71 | %right '?' ':' |
72 | %nonassoc DOTDOT | |
c963b151 | 73 | %left OROR DORDOR |
8d063cd8 | 74 | %left ANDAND |
79072805 LW |
75 | %left <ival> BITOROP |
76 | %left <ival> BITANDOP | |
a687059c LW |
77 | %nonassoc EQOP |
78 | %nonassoc RELOP | |
36477c24 | 79 | %nonassoc UNIOP UNIOPSUB |
79072805 | 80 | %left <ival> SHIFTOP |
a687059c LW |
81 | %left ADDOP |
82 | %left MULOP | |
8990e307 | 83 | %left <ival> MATCHOP |
79072805 LW |
84 | %right '!' '~' UMINUS REFGEN |
85 | %right <ival> POWOP | |
86 | %nonassoc PREINC PREDEC POSTINC POSTDEC | |
8990e307 | 87 | %left ARROW |
fad39ff1 | 88 | %nonassoc <ival> ')' |
8d063cd8 | 89 | %left '(' |
fad39ff1 | 90 | %left '[' '{' |
8d063cd8 LW |
91 | |
92 | %% /* RULES */ | |
93 | ||
891be019 | 94 | /* The whole program */ |
ecb2f335 | 95 | prog : progstart |
ae986130 | 96 | /*CONTINUED*/ lineseq |
ecb2f335 | 97 | { $$ = $1; newPROG(block_end($1,$2)); } |
8d063cd8 LW |
98 | ; |
99 | ||
891be019 | 100 | /* An ordinary block */ |
a687059c | 101 | block : '{' remember lineseq '}' |
3280af22 | 102 | { if (PL_copline > (line_t)$1) |
eb160463 | 103 | PL_copline = (line_t)$1; |
36477c24 | 104 | $$ = block_end($2, $3); } |
a0d0e21e LW |
105 | ; |
106 | ||
55497cff | 107 | remember: /* NULL */ /* start a full lexical scope */ |
108 | { $$ = block_start(TRUE); } | |
109 | ; | |
110 | ||
ecb2f335 NIS |
111 | progstart: |
112 | { | |
ecb2f335 NIS |
113 | PL_expect = XSTATE; $$ = block_start(TRUE); |
114 | } | |
115 | ; | |
116 | ||
117 | ||
bbce6d69 | 118 | mblock : '{' mremember lineseq '}' |
3280af22 | 119 | { if (PL_copline > (line_t)$1) |
eb160463 | 120 | PL_copline = (line_t)$1; |
36477c24 | 121 | $$ = block_end($2, $3); } |
55497cff | 122 | ; |
123 | ||
124 | mremember: /* NULL */ /* start a partial lexical scope */ | |
125 | { $$ = block_start(FALSE); } | |
8d063cd8 LW |
126 | ; |
127 | ||
500bedb6 DM |
128 | savescope: /* NULL */ /* remember stack pos in case of error */ |
129 | { $$ = PL_savestack_ix; } | |
130 | ||
891be019 | 131 | /* A collection of "lines" in the program */ |
8d063cd8 | 132 | lineseq : /* NULL */ |
79072805 LW |
133 | { $$ = Nullop; } |
134 | | lineseq decl | |
135 | { $$ = $1; } | |
500bedb6 DM |
136 | | lineseq savescope line |
137 | { LEAVE_SCOPE($2); | |
138 | $$ = append_list(OP_LINESEQ, | |
139 | (LISTOP*)$1, (LISTOP*)$3); | |
3280af22 | 140 | PL_pad_reset_pending = TRUE; |
500bedb6 | 141 | if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; } |
8d063cd8 LW |
142 | ; |
143 | ||
891be019 | 144 | /* A "line" in the program */ |
79072805 LW |
145 | line : label cond |
146 | { $$ = newSTATEOP(0, $1, $2); } | |
8d063cd8 LW |
147 | | loop /* loops add their own labels */ |
148 | | label ';' | |
149 | { if ($1 != Nullch) { | |
79072805 | 150 | $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0)); |
450a55e4 LW |
151 | } |
152 | else { | |
79072805 | 153 | $$ = Nullop; |
3280af22 | 154 | PL_copline = NOLINE; |
32c2e4fb | 155 | } |
3280af22 | 156 | PL_expect = XSTATE; } |
8d063cd8 | 157 | | label sideff ';' |
79072805 | 158 | { $$ = newSTATEOP(0, $1, $2); |
3280af22 | 159 | PL_expect = XSTATE; } |
8d063cd8 LW |
160 | ; |
161 | ||
891be019 | 162 | /* An expression which may have a side-effect */ |
a687059c | 163 | sideff : error |
79072805 | 164 | { $$ = Nullop; } |
a687059c | 165 | | expr |
79072805 | 166 | { $$ = $1; } |
a687059c | 167 | | expr IF expr |
79072805 | 168 | { $$ = newLOGOP(OP_AND, 0, $3, $1); } |
a687059c | 169 | | expr UNLESS expr |
79072805 | 170 | { $$ = newLOGOP(OP_OR, 0, $3, $1); } |
a687059c | 171 | | expr WHILE expr |
8990e307 | 172 | { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); } |
55497cff | 173 | | expr UNTIL iexpr |
174 | { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);} | |
ecca16b0 | 175 | | expr FOR expr |
eb160463 | 176 | { $$ = newFOROP(0, Nullch, (line_t)$2, |
ecca16b0 | 177 | Nullop, $3, $1, Nullop); } |
79072805 LW |
178 | ; |
179 | ||
891be019 | 180 | /* else and elsif blocks */ |
79072805 LW |
181 | else : /* NULL */ |
182 | { $$ = Nullop; } | |
55497cff | 183 | | ELSE mblock |
38a230cb | 184 | { ($2)->op_flags |= OPf_PARENS; $$ = scope($2); } |
55497cff | 185 | | ELSIF '(' mexpr ')' mblock else |
eb160463 | 186 | { PL_copline = (line_t)$1; |
2c15bef3 | 187 | $$ = newCONDOP(0, $3, scope($5), $6); |
3280af22 | 188 | PL_hints |= HINT_BLOCK_SCOPE; } |
79072805 LW |
189 | ; |
190 | ||
891be019 | 191 | /* Real conditional expressions */ |
55497cff | 192 | cond : IF '(' remember mexpr ')' mblock else |
eb160463 | 193 | { PL_copline = (line_t)$1; |
36477c24 | 194 | $$ = block_end($3, |
bbce6d69 | 195 | newCONDOP(0, $4, scope($6), $7)); } |
55497cff | 196 | | UNLESS '(' remember miexpr ')' mblock else |
eb160463 | 197 | { PL_copline = (line_t)$1; |
36477c24 | 198 | $$ = block_end($3, |
bbce6d69 | 199 | newCONDOP(0, $4, scope($6), $7)); } |
79072805 LW |
200 | ; |
201 | ||
891be019 | 202 | /* Continue blocks */ |
79072805 LW |
203 | cont : /* NULL */ |
204 | { $$ = Nullop; } | |
205 | | CONTINUE block | |
206 | { $$ = scope($2); } | |
207 | ; | |
208 | ||
891be019 | 209 | /* Loops: while, until, for, and a bare block */ |
a034e688 | 210 | loop : label WHILE '(' remember texpr ')' mintro mblock cont |
eb160463 | 211 | { PL_copline = (line_t)$2; |
36477c24 | 212 | $$ = block_end($4, |
55497cff | 213 | newSTATEOP(0, $1, |
bbce6d69 | 214 | newWHILEOP(0, 1, (LOOP*)Nullop, |
a034e688 DM |
215 | $2, $5, $8, $9, $7))); } |
216 | | label UNTIL '(' remember iexpr ')' mintro mblock cont | |
eb160463 | 217 | { PL_copline = (line_t)$2; |
36477c24 | 218 | $$ = block_end($4, |
55497cff | 219 | newSTATEOP(0, $1, |
bbce6d69 | 220 | newWHILEOP(0, 1, (LOOP*)Nullop, |
a034e688 | 221 | $2, $5, $8, $9, $7))); } |
bbce6d69 | 222 | | label FOR MY remember my_scalar '(' mexpr ')' mblock cont |
36477c24 | 223 | { $$ = block_end($4, |
eb160463 | 224 | newFOROP(0, $1, (line_t)$2, $5, $7, $9, $10)); } |
bbce6d69 | 225 | | label FOR scalar '(' remember mexpr ')' mblock cont |
36477c24 | 226 | { $$ = block_end($5, |
eb160463 | 227 | newFOROP(0, $1, (line_t)$2, mod($3, OP_ENTERLOOP), |
bbce6d69 | 228 | $6, $8, $9)); } |
229 | | label FOR '(' remember mexpr ')' mblock cont | |
36477c24 | 230 | { $$ = block_end($4, |
eb160463 | 231 | newFOROP(0, $1, (line_t)$2, Nullop, $5, $7, $8)); } |
a034e688 DM |
232 | | label FOR '(' remember mnexpr ';' texpr ';' mintro mnexpr ')' |
233 | mblock | |
8d063cd8 | 234 | /* basically fake up an initialize-while lineseq */ |
36c66720 | 235 | { OP *forop; |
eb160463 | 236 | PL_copline = (line_t)$2; |
36c66720 RH |
237 | forop = newSTATEOP(0, $1, |
238 | newWHILEOP(0, 1, (LOOP*)Nullop, | |
239 | $2, scalar($7), | |
a034e688 | 240 | $12, $10, $9)); |
36c66720 RH |
241 | if ($5) { |
242 | forop = append_elem(OP_LINESEQ, | |
243 | newSTATEOP(0, ($1?savepv($1):Nullch), | |
244 | $5), | |
245 | forop); | |
246 | } | |
247 | ||
248 | $$ = block_end($4, forop); } | |
79072805 | 249 | | label block cont /* a block is a loop that happens once */ |
fb73857a | 250 | { $$ = newSTATEOP(0, $1, |
251 | newWHILEOP(0, 1, (LOOP*)Nullop, | |
a034e688 | 252 | NOLINE, Nullop, $2, $3, 0)); } |
8d063cd8 LW |
253 | ; |
254 | ||
a034e688 DM |
255 | /* determine whether there are any new my declarations */ |
256 | mintro : /* NULL */ | |
257 | { $$ = (PL_min_intro_pending && | |
258 | PL_max_intro_pending >= PL_min_intro_pending); | |
259 | intro_my(); } | |
260 | ||
891be019 | 261 | /* Normal expression */ |
8d063cd8 | 262 | nexpr : /* NULL */ |
79072805 | 263 | { $$ = Nullop; } |
8d063cd8 LW |
264 | | sideff |
265 | ; | |
266 | ||
891be019 | 267 | /* Boolean expression */ |
8d063cd8 | 268 | texpr : /* NULL means true */ |
b73d6f50 | 269 | { (void)scan_num("1", &yylval); $$ = yylval.opval; } |
8d063cd8 LW |
270 | | expr |
271 | ; | |
272 | ||
891be019 | 273 | /* Inverted boolean expression */ |
55497cff | 274 | iexpr : expr |
275 | { $$ = invert(scalar($1)); } | |
276 | ; | |
277 | ||
891be019 | 278 | /* Expression with its own lexical scope */ |
55497cff | 279 | mexpr : expr |
bbce6d69 | 280 | { $$ = $1; intro_my(); } |
281 | ; | |
282 | ||
283 | mnexpr : nexpr | |
284 | { $$ = $1; intro_my(); } | |
55497cff | 285 | ; |
286 | ||
55497cff | 287 | miexpr : iexpr |
bbce6d69 | 288 | { $$ = $1; intro_my(); } |
55497cff | 289 | ; |
290 | ||
891be019 | 291 | /* Optional "MAIN:"-style loop labels */ |
8d063cd8 LW |
292 | label : /* empty */ |
293 | { $$ = Nullch; } | |
32c2e4fb | 294 | | LABEL |
8d063cd8 LW |
295 | ; |
296 | ||
891be019 | 297 | /* Some kind of declaration - does not take part in the parse tree */ |
8d063cd8 LW |
298 | decl : format |
299 | { $$ = 0; } | |
300 | | subrout | |
301 | { $$ = 0; } | |
09bef843 SB |
302 | | mysubrout |
303 | { $$ = 0; } | |
a687059c LW |
304 | | package |
305 | { $$ = 0; } | |
a0d0e21e | 306 | | use |
85e6fe83 | 307 | { $$ = 0; } |
8d063cd8 LW |
308 | ; |
309 | ||
44a8e56a | 310 | format : FORMAT startformsub formname block |
a0d0e21e | 311 | { newFORM($2, $3, $4); } |
44a8e56a | 312 | ; |
313 | ||
314 | formname: WORD { $$ = $1; } | |
315 | | /* NULL */ { $$ = Nullop; } | |
8d063cd8 LW |
316 | ; |
317 | ||
891be019 | 318 | /* Unimplemented "my sub foo { }" */ |
09bef843 SB |
319 | mysubrout: MYSUB startsub subname proto subattrlist subbody |
320 | { newMYSUB($2, $3, $4, $5, $6); } | |
321 | ; | |
322 | ||
891be019 | 323 | /* Subroutine definition */ |
09bef843 SB |
324 | subrout : SUB startsub subname proto subattrlist subbody |
325 | { newATTRSUB($2, $3, $4, $5, $6); } | |
28757baa | 326 | ; |
327 | ||
fa83b5b6 | 328 | startsub: /* NULL */ /* start a regular subroutine scope */ |
774d564b | 329 | { $$ = start_subparse(FALSE, 0); } |
28757baa | 330 | ; |
331 | ||
332 | startanonsub: /* NULL */ /* start an anonymous subroutine scope */ | |
774d564b | 333 | { $$ = start_subparse(FALSE, CVf_ANON); } |
28757baa | 334 | ; |
335 | ||
44a8e56a | 336 | startformsub: /* NULL */ /* start a format subroutine scope */ |
774d564b | 337 | { $$ = start_subparse(TRUE, 0); } |
44a8e56a | 338 | ; |
339 | ||
891be019 | 340 | /* Name of a subroutine - must be a bareword, could be special */ |
fd367867 | 341 | subname : WORD { STRLEN n_a; const char *name = SvPV_const(((SVOP*)$1)->op_sv,n_a); |
e858de61 | 342 | if (strEQ(name, "BEGIN") || strEQ(name, "END") |
7d30b5c4 | 343 | || strEQ(name, "INIT") || strEQ(name, "CHECK")) |
1aff0e91 | 344 | CvSPECIAL_on(PL_compcv); |
28757baa | 345 | $$ = $1; } |
a0d0e21e LW |
346 | ; |
347 | ||
891be019 | 348 | /* Subroutine prototype */ |
4633a7c4 LW |
349 | proto : /* NULL */ |
350 | { $$ = Nullop; } | |
351 | | THING | |
352 | ; | |
28757baa | 353 | |
891be019 | 354 | /* Optional list of subroutine attributes */ |
09bef843 SB |
355 | subattrlist: /* NULL */ |
356 | { $$ = Nullop; } | |
357 | | COLONATTR THING | |
358 | { $$ = $2; } | |
359 | | COLONATTR | |
360 | { $$ = Nullop; } | |
361 | ; | |
362 | ||
891be019 | 363 | /* List of attributes for a "my" variable declaration */ |
09bef843 SB |
364 | myattrlist: COLONATTR THING |
365 | { $$ = $2; } | |
366 | | COLONATTR | |
367 | { $$ = Nullop; } | |
368 | ; | |
369 | ||
891be019 | 370 | /* Subroutine body - either null or a block */ |
28757baa | 371 | subbody : block { $$ = $1; } |
3280af22 | 372 | | ';' { $$ = Nullop; PL_expect = XSTATE; } |
8d063cd8 LW |
373 | ; |
374 | ||
a687059c | 375 | package : PACKAGE WORD ';' |
79072805 | 376 | { package($2); } |
a687059c LW |
377 | ; |
378 | ||
28757baa | 379 | use : USE startsub |
1aff0e91 | 380 | { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ } |
28757baa | 381 | WORD WORD listexpr ';' |
382 | { utilize($1, $2, $4, $5, $6); } | |
85e6fe83 LW |
383 | ; |
384 | ||
891be019 | 385 | /* Ordinary expressions; logical combinations */ |
a0d0e21e LW |
386 | expr : expr ANDOP expr |
387 | { $$ = newLOGOP(OP_AND, 0, $1, $3); } | |
388 | | expr OROP expr | |
389 | { $$ = newLOGOP($2, 0, $1, $3); } | |
c963b151 BD |
390 | | expr DOROP expr |
391 | { $$ = newLOGOP(OP_DOR, 0, $1, $3); } | |
fad39ff1 | 392 | | argexpr %prec PREC_LOW |
a0d0e21e LW |
393 | ; |
394 | ||
891be019 | 395 | /* Expressions are a list of terms joined by commas */ |
a0d0e21e LW |
396 | argexpr : argexpr ',' |
397 | { $$ = $1; } | |
398 | | argexpr ',' term | |
79072805 | 399 | { $$ = append_elem(OP_LIST, $1, $3); } |
fad39ff1 | 400 | | term %prec PREC_LOW |
8d063cd8 LW |
401 | ; |
402 | ||
891be019 | 403 | /* List operators */ |
ad4673e5 | 404 | listop : LSTOP indirob argexpr /* map {...} @args or print $fh @args */ |
79072805 | 405 | { $$ = convert($1, OPf_STACKED, |
a0d0e21e | 406 | prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); } |
891be019 | 407 | | FUNC '(' indirob expr ')' /* print ($fh @args */ |
79072805 | 408 | { $$ = convert($1, OPf_STACKED, |
a0d0e21e | 409 | prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); } |
891be019 | 410 | | term ARROW method '(' listexprcom ')' /* $foo->bar(list) */ |
4633a7c4 | 411 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e | 412 | append_elem(OP_LIST, |
55497cff | 413 | prepend_elem(OP_LIST, scalar($1), $5), |
a0d0e21e | 414 | newUNOP(OP_METHOD, 0, $3))); } |
891be019 | 415 | | term ARROW method /* $foo->bar */ |
b1524f17 SM |
416 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
417 | append_elem(OP_LIST, scalar($1), | |
418 | newUNOP(OP_METHOD, 0, $3))); } | |
891be019 | 419 | | METHOD indirob listexpr /* new Class @args */ |
4633a7c4 | 420 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e | 421 | append_elem(OP_LIST, |
4633a7c4 | 422 | prepend_elem(OP_LIST, $2, $3), |
a0d0e21e | 423 | newUNOP(OP_METHOD, 0, $1))); } |
891be019 | 424 | | FUNCMETH indirob '(' listexprcom ')' /* method $object (@args) */ |
4633a7c4 | 425 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e | 426 | append_elem(OP_LIST, |
4633a7c4 | 427 | prepend_elem(OP_LIST, $2, $4), |
a0d0e21e | 428 | newUNOP(OP_METHOD, 0, $1))); } |
891be019 | 429 | | LSTOP listexpr /* print @args */ |
79072805 | 430 | { $$ = convert($1, 0, $2); } |
891be019 | 431 | | FUNC '(' listexprcom ')' /* print (@args) */ |
79072805 | 432 | { $$ = convert($1, 0, $3); } |
ad4673e5 | 433 | | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */ |
09bef843 | 434 | { $3 = newANONATTRSUB($2, 0, Nullop, $3); } |
891be019 | 435 | listexpr %prec LSTOP /* ... @bar */ |
4633a7c4 | 436 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
28757baa | 437 | append_elem(OP_LIST, |
438 | prepend_elem(OP_LIST, $3, $5), $1)); } | |
a687059c LW |
439 | ; |
440 | ||
891be019 | 441 | /* Names of methods. May use $object->$methodname */ |
a0d0e21e LW |
442 | method : METHOD |
443 | | scalar | |
444 | ; | |
445 | ||
891be019 SC |
446 | /* Some kind of subscripted expression */ |
447 | subscripted: star '{' expr ';' '}' /* *main::{something} */ | |
448 | /* In this and all the hash accessors, ';' is | |
449 | * provided by the tokeniser */ | |
264e1af3 RGS |
450 | { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); |
451 | PL_expect = XOPERATOR; } | |
891be019 | 452 | | scalar '[' expr ']' /* $array[$element] */ |
fad39ff1 | 453 | { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); } |
891be019 | 454 | | term ARROW '[' expr ']' /* somearef->[$element] */ |
fad39ff1 SM |
455 | { $$ = newBINOP(OP_AELEM, 0, |
456 | ref(newAVREF($1),OP_RV2AV), | |
457 | scalar($4));} | |
891be019 | 458 | | subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */ |
fad39ff1 SM |
459 | { $$ = newBINOP(OP_AELEM, 0, |
460 | ref(newAVREF($1),OP_RV2AV), | |
461 | scalar($3));} | |
891be019 | 462 | | scalar '{' expr ';' '}' /* $foo->{bar();} */ |
fad39ff1 SM |
463 | { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3)); |
464 | PL_expect = XOPERATOR; } | |
891be019 | 465 | | term ARROW '{' expr ';' '}' /* somehref->{bar();} */ |
fad39ff1 SM |
466 | { $$ = newBINOP(OP_HELEM, 0, |
467 | ref(newHVREF($1),OP_RV2HV), | |
468 | jmaybe($4)); | |
469 | PL_expect = XOPERATOR; } | |
891be019 | 470 | | subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */ |
fad39ff1 SM |
471 | { $$ = newBINOP(OP_HELEM, 0, |
472 | ref(newHVREF($1),OP_RV2HV), | |
473 | jmaybe($3)); | |
474 | PL_expect = XOPERATOR; } | |
891be019 | 475 | | term ARROW '(' ')' /* $subref->() */ |
fad39ff1 SM |
476 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
477 | newCVREF(0, scalar($1))); } | |
891be019 | 478 | | term ARROW '(' expr ')' /* $subref->(@args) */ |
fad39ff1 SM |
479 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
480 | append_elem(OP_LIST, $4, | |
481 | newCVREF(0, scalar($1)))); } | |
482 | ||
891be019 | 483 | | subscripted '(' expr ')' /* $foo->{bar}->(@args) */ |
fad39ff1 SM |
484 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
485 | append_elem(OP_LIST, $3, | |
486 | newCVREF(0, scalar($1)))); } | |
891be019 | 487 | | subscripted '(' ')' /* $foo->{bar}->() */ |
fad39ff1 SM |
488 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
489 | newCVREF(0, scalar($1))); } | |
891be019 | 490 | ; |
fad39ff1 | 491 | |
891be019 SC |
492 | /* Binary operators between terms */ |
493 | termbinop : term ASSIGNOP term /* $x = $y */ | |
a0d0e21e | 494 | { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); } |
891be019 | 495 | | term POWOP term /* $x ** $y */ |
79072805 | 496 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 497 | | term MULOP term /* $x * $y, $x x $y */ |
79072805 LW |
498 | { if ($2 != OP_REPEAT) |
499 | scalar($1); | |
500 | $$ = newBINOP($2, 0, $1, scalar($3)); } | |
891be019 | 501 | | term ADDOP term /* $x + $y */ |
79072805 | 502 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 503 | | term SHIFTOP term /* $x >> $y, $x << $y */ |
79072805 | 504 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 505 | | term RELOP term /* $x > $y, etc. */ |
79072805 | 506 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 507 | | term EQOP term /* $x == $y, $x eq $y */ |
79072805 | 508 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 509 | | term BITANDOP term /* $x & $y */ |
79072805 | 510 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 511 | | term BITOROP term /* $x | $y */ |
79072805 | 512 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 | 513 | | term DOTDOT term /* $x..$y, $x...$y */ |
79072805 | 514 | { $$ = newRANGE($2, scalar($1), scalar($3));} |
891be019 | 515 | | term ANDAND term /* $x && $y */ |
463ee0b2 | 516 | { $$ = newLOGOP(OP_AND, 0, $1, $3); } |
891be019 | 517 | | term OROR term /* $x || $y */ |
463ee0b2 | 518 | { $$ = newLOGOP(OP_OR, 0, $1, $3); } |
c963b151 BD |
519 | | term DORDOR term /* $x // $y */ |
520 | { $$ = newLOGOP(OP_DOR, 0, $1, $3); } | |
891be019 | 521 | | term MATCHOP term /* $x =~ /$y/ */ |
79072805 | 522 | { $$ = bind_match($2, $1, $3); } |
891be019 | 523 | ; |
8d063cd8 | 524 | |
891be019 SC |
525 | /* Unary operators and terms */ |
526 | termunop : '-' term %prec UMINUS /* -$x */ | |
79072805 | 527 | { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); } |
891be019 | 528 | | '+' term %prec UMINUS /* +$x */ |
a687059c | 529 | { $$ = $2; } |
891be019 | 530 | | '!' term /* !$x */ |
79072805 | 531 | { $$ = newUNOP(OP_NOT, 0, scalar($2)); } |
891be019 | 532 | | '~' term /* ~$x */ |
79072805 | 533 | { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));} |
891be019 | 534 | | term POSTINC /* $x++ */ |
79072805 | 535 | { $$ = newUNOP(OP_POSTINC, 0, |
463ee0b2 | 536 | mod(scalar($1), OP_POSTINC)); } |
891be019 | 537 | | term POSTDEC /* $x-- */ |
79072805 | 538 | { $$ = newUNOP(OP_POSTDEC, 0, |
463ee0b2 | 539 | mod(scalar($1), OP_POSTDEC)); } |
891be019 | 540 | | PREINC term /* ++$x */ |
79072805 | 541 | { $$ = newUNOP(OP_PREINC, 0, |
463ee0b2 | 542 | mod(scalar($2), OP_PREINC)); } |
891be019 | 543 | | PREDEC term /* --$x */ |
79072805 | 544 | { $$ = newUNOP(OP_PREDEC, 0, |
463ee0b2 | 545 | mod(scalar($2), OP_PREDEC)); } |
891be019 SC |
546 | |
547 | ; | |
548 | ||
549 | /* Constructors for anonymous data */ | |
550 | anonymous: '[' expr ']' | |
551 | { $$ = newANONLIST($2); } | |
552 | | '[' ']' | |
553 | { $$ = newANONLIST(Nullop); } | |
554 | | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */ | |
ecb2f335 | 555 | { $$ = newANONHASH($2); } |
891be019 SC |
556 | | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */ |
557 | { $$ = newANONHASH(Nullop); } | |
558 | | ANONSUB startanonsub proto subattrlist block %prec '(' | |
559 | { $$ = newANONATTRSUB($2, $3, $4, $5); } | |
560 | ||
561 | ; | |
562 | ||
563 | /* Things called with "do" */ | |
564 | termdo : DO term %prec UNIOP /* do $filename */ | |
565 | { $$ = dofile($2); } | |
566 | | DO block %prec '(' /* do { code */ | |
567 | { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); } | |
568 | | DO WORD '(' ')' /* do somesub() */ | |
569 | { $$ = newUNOP(OP_ENTERSUB, | |
570 | OPf_SPECIAL|OPf_STACKED, | |
571 | prepend_elem(OP_LIST, | |
572 | scalar(newCVREF( | |
573 | (OPpENTERSUB_AMPER<<8), | |
574 | scalar($2) | |
575 | )),Nullop)); dep();} | |
576 | | DO WORD '(' expr ')' /* do somesub(@args) */ | |
577 | { $$ = newUNOP(OP_ENTERSUB, | |
578 | OPf_SPECIAL|OPf_STACKED, | |
579 | append_elem(OP_LIST, | |
580 | $4, | |
581 | scalar(newCVREF( | |
582 | (OPpENTERSUB_AMPER<<8), | |
583 | scalar($2) | |
584 | )))); dep();} | |
585 | | DO scalar '(' ')' /* do $subref () */ | |
586 | { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED, | |
587 | prepend_elem(OP_LIST, | |
588 | scalar(newCVREF(0,scalar($2))), Nullop)); dep();} | |
589 | | DO scalar '(' expr ')' /* do $subref (@args) */ | |
590 | { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED, | |
591 | prepend_elem(OP_LIST, | |
592 | $4, | |
593 | scalar(newCVREF(0,scalar($2))))); dep();} | |
594 | ||
595 | ; | |
596 | ||
597 | term : termbinop | |
598 | | termunop | |
599 | | anonymous | |
600 | | termdo | |
e9bdcc27 | 601 | | term '?' term ':' term |
891be019 SC |
602 | { $$ = newCONDOP(0, $1, $3, $5); } |
603 | | REFGEN term /* \$x, \@y, \%z */ | |
604 | { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); } | |
09bef843 SB |
605 | | myattrterm %prec UNIOP |
606 | { $$ = $1; } | |
607 | | LOCAL term %prec UNIOP | |
93a17b20 | 608 | { $$ = localize($2,$1); } |
a0d0e21e | 609 | | '(' expr ')' |
79072805 | 610 | { $$ = sawparens($2); } |
8d063cd8 | 611 | | '(' ')' |
8990e307 | 612 | { $$ = sawparens(newNULLLIST()); } |
79072805 | 613 | | scalar %prec '(' |
8d063cd8 | 614 | { $$ = $1; } |
79072805 | 615 | | star %prec '(' |
8d063cd8 | 616 | { $$ = $1; } |
79072805 | 617 | | hsh %prec '(' |
8d063cd8 | 618 | { $$ = $1; } |
79072805 | 619 | | ary %prec '(' |
8d063cd8 | 620 | { $$ = $1; } |
891be019 | 621 | | arylen %prec '(' /* $#x, $#{ something } */ |
79072805 | 622 | { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));} |
fad39ff1 SM |
623 | | subscripted |
624 | { $$ = $1; } | |
891be019 | 625 | | '(' expr ')' '[' expr ']' /* list slice */ |
79072805 | 626 | { $$ = newSLICEOP(0, $5, $2); } |
891be019 | 627 | | '(' ')' '[' expr ']' /* empty list slice! */ |
79072805 | 628 | { $$ = newSLICEOP(0, $4, Nullop); } |
891be019 | 629 | | ary '[' expr ']' /* array slice */ |
79072805 LW |
630 | { $$ = prepend_elem(OP_ASLICE, |
631 | newOP(OP_PUSHMARK, 0), | |
79072805 LW |
632 | newLISTOP(OP_ASLICE, 0, |
633 | list($3), | |
a0d0e21e | 634 | ref($1, OP_ASLICE))); } |
891be019 | 635 | | ary '{' expr ';' '}' /* @hash{@keys} */ |
79072805 LW |
636 | { $$ = prepend_elem(OP_HSLICE, |
637 | newOP(OP_PUSHMARK, 0), | |
79072805 LW |
638 | newLISTOP(OP_HSLICE, 0, |
639 | list($3), | |
a0d0e21e | 640 | ref(oopsHV($1), OP_HSLICE))); |
3280af22 | 641 | PL_expect = XOPERATOR; } |
79072805 LW |
642 | | THING %prec '(' |
643 | { $$ = $1; } | |
891be019 | 644 | | amper /* &foo; */ |
c07a80fd | 645 | { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); } |
ecb2f335 | 646 | | amper '(' ')' /* &foo() */ |
a0d0e21e | 647 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); } |
891be019 | 648 | | amper '(' expr ')' /* &foo(@args) */ |
a0d0e21e | 649 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
4633a7c4 | 650 | append_elem(OP_LIST, $3, scalar($1))); } |
891be019 | 651 | | NOAMP WORD listexpr /* foo(@args) */ |
a0d0e21e | 652 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
a5f75d66 | 653 | append_elem(OP_LIST, $3, scalar($2))); } |
891be019 | 654 | | LOOPEX /* loop exiting command (goto, last, dump, etc) */ |
85e6fe83 | 655 | { $$ = newOP($1, OPf_SPECIAL); |
3280af22 | 656 | PL_hints |= HINT_BLOCK_SCOPE; } |
a0d0e21e | 657 | | LOOPEX term |
8990e307 | 658 | { $$ = newLOOPEX($1,$2); } |
891be019 | 659 | | NOTOP argexpr /* not $foo */ |
c07a80fd | 660 | { $$ = newUNOP(OP_NOT, 0, scalar($2)); } |
891be019 | 661 | | UNIOP /* Unary op, $_ implied */ |
79072805 | 662 | { $$ = newOP($1, 0); } |
30173ab5 | 663 | | UNIOP block /* eval { foo } */ |
79072805 | 664 | { $$ = newUNOP($1, 0, $2); } |
891be019 | 665 | | UNIOP term /* Unary op */ |
79072805 | 666 | { $$ = newUNOP($1, 0, $2); } |
891be019 | 667 | | UNIOPSUB term /* Sub treated as unop */ |
4633a7c4 LW |
668 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
669 | append_elem(OP_LIST, $2, scalar($1))); } | |
891be019 | 670 | | FUNC0 /* Nullary operator */ |
79072805 | 671 | { $$ = newOP($1, 0); } |
ae986130 | 672 | | FUNC0 '(' ')' |
79072805 | 673 | { $$ = newOP($1, 0); } |
891be019 | 674 | | FUNC0SUB /* Sub treated as nullop */ |
28757baa | 675 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
4633a7c4 | 676 | scalar($1)); } |
891be019 | 677 | | FUNC1 '(' ')' /* not () */ |
a758b0b5 MHM |
678 | { $$ = $1 == OP_NOT ? newUNOP($1, 0, newSVOP(OP_CONST, 0, newSViv(0))) |
679 | : newOP($1, OPf_SPECIAL); } | |
891be019 | 680 | | FUNC1 '(' expr ')' /* not($foo) */ |
79072805 | 681 | { $$ = newUNOP($1, 0, $3); } |
131b3ad0 DM |
682 | | PMFUNC '(' argexpr ')' /* m//, s///, tr/// */ |
683 | { $$ = pmruntime($1, $3, 1); } | |
79072805 | 684 | | WORD |
378cc40b | 685 | | listop |
8d063cd8 LW |
686 | ; |
687 | ||
891be019 | 688 | /* "my" declarations, with optional attributes */ |
09bef843 SB |
689 | myattrterm: MY myterm myattrlist |
690 | { $$ = my_attrs($2,$3); } | |
691 | | MY myterm | |
692 | { $$ = localize($2,$1); } | |
693 | ; | |
694 | ||
891be019 | 695 | /* Things that can be "my"'d */ |
09bef843 SB |
696 | myterm : '(' expr ')' |
697 | { $$ = sawparens($2); } | |
698 | | '(' ')' | |
699 | { $$ = sawparens(newNULLLIST()); } | |
700 | | scalar %prec '(' | |
701 | { $$ = $1; } | |
702 | | hsh %prec '(' | |
703 | { $$ = $1; } | |
704 | | ary %prec '(' | |
705 | { $$ = $1; } | |
706 | ; | |
707 | ||
891be019 | 708 | /* Basic list expressions */ |
fad39ff1 | 709 | listexpr: /* NULL */ %prec PREC_LOW |
8990e307 | 710 | { $$ = Nullop; } |
fad39ff1 | 711 | | argexpr %prec PREC_LOW |
a0d0e21e LW |
712 | { $$ = $1; } |
713 | ; | |
714 | ||
715 | listexprcom: /* NULL */ | |
716 | { $$ = Nullop; } | |
79072805 LW |
717 | | expr |
718 | { $$ = $1; } | |
a0d0e21e LW |
719 | | expr ',' |
720 | { $$ = $1; } | |
79072805 LW |
721 | ; |
722 | ||
891be019 SC |
723 | /* A little bit of trickery to make "for my $foo (@bar)" actually be |
724 | lexical */ | |
55497cff | 725 | my_scalar: scalar |
3280af22 | 726 | { PL_in_my = 0; $$ = my($1); } |
55497cff | 727 | ; |
728 | ||
79072805 | 729 | amper : '&' indirob |
c07a80fd | 730 | { $$ = newCVREF($1,$2); } |
a687059c LW |
731 | ; |
732 | ||
79072805 LW |
733 | scalar : '$' indirob |
734 | { $$ = newSVREF($2); } | |
a687059c LW |
735 | ; |
736 | ||
79072805 LW |
737 | ary : '@' indirob |
738 | { $$ = newAVREF($2); } | |
739 | ; | |
740 | ||
741 | hsh : '%' indirob | |
742 | { $$ = newHVREF($2); } | |
743 | ; | |
744 | ||
745 | arylen : DOLSHARP indirob | |
746 | { $$ = newAVREF($2); } | |
747 | ; | |
748 | ||
749 | star : '*' indirob | |
a0d0e21e | 750 | { $$ = newGVREF(0,$2); } |
79072805 LW |
751 | ; |
752 | ||
891be019 | 753 | /* Indirect objects */ |
79072805 LW |
754 | indirob : WORD |
755 | { $$ = scalar($1); } | |
fad39ff1 | 756 | | scalar %prec PREC_LOW |
463ee0b2 | 757 | { $$ = scalar($1); } |
79072805 | 758 | | block |
a0d0e21e | 759 | { $$ = scope($1); } |
79072805 | 760 | |
93a17b20 LW |
761 | | PRIVATEREF |
762 | { $$ = $1; } | |
8d063cd8 | 763 | ; |