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1 | /* perly.y |
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2 | * |
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3 | * Copyright (c) 1991-2002, 2003, 2004 Larry Wall |
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4 | * |
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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. |
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7 | * |
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8 | */ |
9 | |
10 | /* |
11 | * 'I see,' laughed Strider. 'I look foul and feel fair. Is that it? |
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12 | * All that is gold does not glitter, not all those who wander are lost.' |
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13 | */ |
14 | |
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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. |
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21 | * It relies on the lexer in toke.c to do the tokenizing. |
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22 | */ |
23 | |
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24 | /* Make the parser re-entrant. */ |
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25 | |
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26 | %pure_parser |
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27 | |
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28 | %start prog |
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29 | |
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30 | %union { |
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31 | I32 ival; |
32 | char *pval; |
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33 | #ifdef PERL_MAD |
34 | TOKEN* tkval; |
35 | #endif |
79072805 |
36 | OP *opval; |
37 | GV *gvval; |
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38 | } |
39 | |
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40 | %token <ival> '{' |
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41 | |
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42 | %token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF |
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43 | %token <opval> FUNC0SUB UNIOPSUB LSTOPSUB |
79072805 |
44 | %token <pval> LABEL |
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45 | %token <ival> FORMAT SUB ANONSUB PACKAGE USE |
79072805 |
46 | %token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR |
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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 |
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54 | |
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55 | %type <ival> prog decl format startsub startanonsub startformsub mintro |
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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 |
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60 | %type <opval> listexpr listexprcom indirob listop method |
61 | %type <opval> formname subname proto subbody cont my_scalar |
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62 | %type <opval> subattrlist myattrlist mysubrout myattrterm myterm |
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63 | %type <opval> termbinop termunop anonymous termdo |
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64 | %type <opval> switch case |
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65 | %type <pval> label |
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66 | |
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67 | %nonassoc PREC_LOW |
68 | %nonassoc LOOPEX |
69 | |
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70 | %left <ival> OROP DOROP |
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71 | %left ANDOP |
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72 | %right NOTOP |
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73 | %nonassoc LSTOP LSTOPSUB |
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74 | %left ',' |
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75 | %right <ival> ASSIGNOP |
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76 | %right '?' ':' |
77 | %nonassoc DOTDOT |
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78 | %left OROR DORDOR |
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79 | %left ANDAND |
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80 | %left <ival> BITOROP |
81 | %left <ival> BITANDOP |
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82 | %nonassoc EQOP |
83 | %nonassoc RELOP |
36477c24 |
84 | %nonassoc UNIOP UNIOPSUB |
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85 | %nonassoc REQUIRE |
79072805 |
86 | %left <ival> SHIFTOP |
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87 | %left ADDOP |
88 | %left MULOP |
8990e307 |
89 | %left <ival> MATCHOP |
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90 | %right '!' '~' UMINUS REFGEN |
91 | %right <ival> POWOP |
92 | %nonassoc PREINC PREDEC POSTINC POSTDEC |
8990e307 |
93 | %left ARROW |
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94 | %nonassoc <ival> ')' |
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95 | %left '(' |
fad39ff1 |
96 | %left '[' '{' |
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97 | |
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98 | %token PEG |
99 | |
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100 | %% /* RULES */ |
101 | |
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102 | /* The whole program */ |
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103 | prog : progstart |
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104 | /*CONTINUED*/ lineseq |
ecb2f335 |
105 | { $$ = $1; newPROG(block_end($1,$2)); } |
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106 | ; |
107 | |
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108 | /* An ordinary block */ |
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109 | block : '{' remember lineseq '}' |
3280af22 |
110 | { if (PL_copline > (line_t)$1) |
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111 | PL_copline = (line_t)$1; |
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112 | $$ = block_end($2, $3); } |
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113 | ; |
114 | |
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115 | remember: /* NULL */ /* start a full lexical scope */ |
116 | { $$ = block_start(TRUE); } |
117 | ; |
118 | |
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119 | mydefsv: /* NULL */ /* lexicalize $_ */ |
120 | { $$ = (I32) allocmy("$_"); } |
121 | ; |
122 | |
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123 | progstart: |
124 | { |
ecb2f335 |
125 | PL_expect = XSTATE; $$ = block_start(TRUE); |
126 | } |
127 | ; |
128 | |
129 | |
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130 | mblock : '{' mremember lineseq '}' |
3280af22 |
131 | { if (PL_copline > (line_t)$1) |
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132 | PL_copline = (line_t)$1; |
36477c24 |
133 | $$ = block_end($2, $3); } |
55497cff |
134 | ; |
135 | |
136 | mremember: /* NULL */ /* start a partial lexical scope */ |
137 | { $$ = block_start(FALSE); } |
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138 | ; |
139 | |
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140 | savescope: /* NULL */ /* remember stack pos in case of error */ |
141 | { $$ = PL_savestack_ix; } |
142 | |
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143 | /* A collection of "lines" in the program */ |
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144 | lineseq : /* NULL */ |
79072805 |
145 | { $$ = Nullop; } |
146 | | lineseq decl |
147 | { $$ = $1; } |
500bedb6 |
148 | | lineseq savescope line |
149 | { LEAVE_SCOPE($2); |
150 | $$ = append_list(OP_LINESEQ, |
151 | (LISTOP*)$1, (LISTOP*)$3); |
3280af22 |
152 | PL_pad_reset_pending = TRUE; |
500bedb6 |
153 | if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; } |
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154 | ; |
155 | |
891be019 |
156 | /* A "line" in the program */ |
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157 | line : label cond |
158 | { $$ = newSTATEOP(0, $1, $2); } |
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159 | | loop /* loops add their own labels */ |
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160 | | switch /* ... and so do switches */ |
161 | { $$ = $1; } |
162 | | label case |
163 | { $$ = newSTATEOP(0, $1, $2); } |
8d063cd8 |
164 | | label ';' |
165 | { if ($1 != Nullch) { |
79072805 |
166 | $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0)); |
450a55e4 |
167 | } |
168 | else { |
79072805 |
169 | $$ = Nullop; |
3280af22 |
170 | PL_copline = NOLINE; |
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171 | } |
3280af22 |
172 | PL_expect = XSTATE; } |
8d063cd8 |
173 | | label sideff ';' |
79072805 |
174 | { $$ = newSTATEOP(0, $1, $2); |
3280af22 |
175 | PL_expect = XSTATE; } |
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176 | ; |
177 | |
891be019 |
178 | /* An expression which may have a side-effect */ |
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179 | sideff : error |
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180 | { $$ = Nullop; } |
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181 | | expr |
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182 | { $$ = $1; } |
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183 | | expr IF expr |
79072805 |
184 | { $$ = newLOGOP(OP_AND, 0, $3, $1); } |
a687059c |
185 | | expr UNLESS expr |
79072805 |
186 | { $$ = newLOGOP(OP_OR, 0, $3, $1); } |
a687059c |
187 | | expr WHILE expr |
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188 | { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); } |
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189 | | expr UNTIL iexpr |
190 | { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);} |
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191 | | expr FOR expr |
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192 | { $$ = newFOROP(0, Nullch, (line_t)$2, |
ecca16b0 |
193 | Nullop, $3, $1, Nullop); } |
79072805 |
194 | ; |
195 | |
891be019 |
196 | /* else and elsif blocks */ |
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197 | else : /* NULL */ |
198 | { $$ = Nullop; } |
55497cff |
199 | | ELSE mblock |
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200 | { ($2)->op_flags |= OPf_PARENS; $$ = scope($2); } |
55497cff |
201 | | ELSIF '(' mexpr ')' mblock else |
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202 | { PL_copline = (line_t)$1; |
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203 | $$ = newCONDOP(0, $3, scope($5), $6); |
3280af22 |
204 | PL_hints |= HINT_BLOCK_SCOPE; } |
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205 | ; |
206 | |
891be019 |
207 | /* Real conditional expressions */ |
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208 | cond : IF '(' remember mexpr ')' mblock else |
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209 | { PL_copline = (line_t)$1; |
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210 | $$ = block_end($3, |
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211 | newCONDOP(0, $4, scope($6), $7)); } |
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212 | | UNLESS '(' remember miexpr ')' mblock else |
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213 | { PL_copline = (line_t)$1; |
36477c24 |
214 | $$ = block_end($3, |
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215 | newCONDOP(0, $4, scope($6), $7)); } |
79072805 |
216 | ; |
217 | |
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218 | /* Cases for a switch statement */ |
219 | case : WHEN '(' remember mexpr ')' mblock |
220 | { $$ = block_end($3, |
221 | newWHENOP($4, scope($6))); } |
222 | | DEFAULT block |
223 | { $$ = newWHENOP(0, scope($2)); } |
224 | ; |
225 | |
891be019 |
226 | /* Continue blocks */ |
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227 | cont : /* NULL */ |
228 | { $$ = Nullop; } |
229 | | CONTINUE block |
230 | { $$ = scope($2); } |
231 | ; |
232 | |
891be019 |
233 | /* Loops: while, until, for, and a bare block */ |
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234 | loop : label WHILE '(' remember texpr ')' mintro mblock cont |
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235 | { PL_copline = (line_t)$2; |
36477c24 |
236 | $$ = block_end($4, |
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237 | newSTATEOP(0, $1, |
bbce6d69 |
238 | newWHILEOP(0, 1, (LOOP*)Nullop, |
a034e688 |
239 | $2, $5, $8, $9, $7))); } |
240 | | label UNTIL '(' remember iexpr ')' mintro mblock cont |
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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 | { $$ = block_end($5, |
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251 | newFOROP(0, $1, (line_t)$2, mod($3, OP_ENTERLOOP), |
bbce6d69 |
252 | $6, $8, $9)); } |
253 | | label FOR '(' remember mexpr ')' mblock cont |
36477c24 |
254 | { $$ = block_end($4, |
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255 | newFOROP(0, $1, (line_t)$2, Nullop, $5, $7, $8)); } |
a034e688 |
256 | | label FOR '(' remember mnexpr ';' texpr ';' mintro mnexpr ')' |
257 | mblock |
8d063cd8 |
258 | /* basically fake up an initialize-while lineseq */ |
36c66720 |
259 | { OP *forop; |
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260 | PL_copline = (line_t)$2; |
36c66720 |
261 | forop = newSTATEOP(0, $1, |
262 | newWHILEOP(0, 1, (LOOP*)Nullop, |
263 | $2, scalar($7), |
a034e688 |
264 | $12, $10, $9)); |
36c66720 |
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 |
277 | ; |
278 | |
0d863452 |
279 | /* Switch blocks */ |
280 | switch : label GIVEN '(' remember mydefsv mexpr ')' mblock |
281 | { PL_copline = (line_t) $2; |
282 | $$ = block_end($4, |
283 | newSTATEOP(0, $1, |
284 | newGIVENOP($6, scope($8), |
285 | (PADOFFSET) $5) )); } |
286 | ; |
287 | |
a034e688 |
288 | /* determine whether there are any new my declarations */ |
289 | mintro : /* NULL */ |
290 | { $$ = (PL_min_intro_pending && |
291 | PL_max_intro_pending >= PL_min_intro_pending); |
292 | intro_my(); } |
293 | |
891be019 |
294 | /* Normal expression */ |
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295 | nexpr : /* NULL */ |
79072805 |
296 | { $$ = Nullop; } |
8d063cd8 |
297 | | sideff |
298 | ; |
299 | |
891be019 |
300 | /* Boolean expression */ |
8d063cd8 |
301 | texpr : /* NULL means true */ |
b73d6f50 |
302 | { (void)scan_num("1", &yylval); $$ = yylval.opval; } |
8d063cd8 |
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 |
325 | label : /* empty */ |
326 | { $$ = Nullch; } |
32c2e4fb |
327 | | LABEL |
8d063cd8 |
328 | ; |
329 | |
891be019 |
330 | /* Some kind of declaration - does not take part in the parse tree */ |
8d063cd8 |
331 | decl : format |
332 | { $$ = 0; } |
333 | | subrout |
334 | { $$ = 0; } |
09bef843 |
335 | | mysubrout |
336 | { $$ = 0; } |
a687059c |
337 | | package |
338 | { $$ = 0; } |
a0d0e21e |
339 | | use |
85e6fe83 |
340 | { $$ = 0; } |
8d063cd8 |
341 | ; |
342 | |
44a8e56a |
343 | format : FORMAT startformsub formname block |
a8ff2fa6 |
344 | { SvREFCNT_inc(PL_compcv); |
345 | newFORM($2, $3, $4); } |
44a8e56a |
346 | ; |
347 | |
348 | formname: WORD { $$ = $1; } |
349 | | /* NULL */ { $$ = Nullop; } |
8d063cd8 |
350 | ; |
351 | |
891be019 |
352 | /* Unimplemented "my sub foo { }" */ |
09bef843 |
353 | mysubrout: MYSUB startsub subname proto subattrlist subbody |
a8ff2fa6 |
354 | { SvREFCNT_inc(PL_compcv); |
355 | newMYSUB($2, $3, $4, $5, $6); } |
09bef843 |
356 | ; |
357 | |
891be019 |
358 | /* Subroutine definition */ |
09bef843 |
359 | subrout : SUB startsub subname proto subattrlist subbody |
a8ff2fa6 |
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 |
365 | { $$ = start_subparse(FALSE, 0); |
366 | SAVEFREESV(PL_compcv); } |
28757baa |
367 | ; |
368 | |
369 | startanonsub: /* NULL */ /* start an anonymous subroutine scope */ |
a8ff2fa6 |
370 | { $$ = start_subparse(FALSE, CVf_ANON); |
371 | SAVEFREESV(PL_compcv); } |
28757baa |
372 | ; |
373 | |
44a8e56a |
374 | startformsub: /* NULL */ /* start a format subroutine scope */ |
a8ff2fa6 |
375 | { $$ = start_subparse(TRUE, 0); |
376 | SAVEFREESV(PL_compcv); } |
44a8e56a |
377 | ; |
378 | |
891be019 |
379 | /* Name of a subroutine - must be a bareword, could be special */ |
2596d9fe |
380 | subname : WORD { const char *const name = SvPV_nolen_const(((SVOP*)$1)->op_sv); |
e858de61 |
381 | if (strEQ(name, "BEGIN") || strEQ(name, "END") |
3c10abe3 |
382 | || strEQ(name, "INIT") || strEQ(name, "CHECK") |
383 | || strEQ(name, "UNITCHECK")) |
1aff0e91 |
384 | CvSPECIAL_on(PL_compcv); |
28757baa |
385 | $$ = $1; } |
a0d0e21e |
386 | ; |
387 | |
891be019 |
388 | /* Subroutine prototype */ |
4633a7c4 |
389 | proto : /* NULL */ |
390 | { $$ = Nullop; } |
391 | | THING |
392 | ; |
28757baa |
393 | |
891be019 |
394 | /* Optional list of subroutine attributes */ |
09bef843 |
395 | subattrlist: /* NULL */ |
396 | { $$ = Nullop; } |
397 | | COLONATTR THING |
398 | { $$ = $2; } |
399 | | COLONATTR |
400 | { $$ = Nullop; } |
401 | ; |
402 | |
891be019 |
403 | /* List of attributes for a "my" variable declaration */ |
09bef843 |
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 |
413 | ; |
414 | |
a687059c |
415 | package : PACKAGE WORD ';' |
79072805 |
416 | { package($2); } |
a687059c |
417 | ; |
418 | |
28757baa |
419 | use : USE startsub |
1aff0e91 |
420 | { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ } |
28757baa |
421 | WORD WORD listexpr ';' |
a8ff2fa6 |
422 | { SvREFCNT_inc(PL_compcv); |
423 | utilize($1, $2, $4, $5, $6); } |
85e6fe83 |
424 | ; |
425 | |
891be019 |
426 | /* Ordinary expressions; logical combinations */ |
a0d0e21e |
427 | expr : expr ANDOP expr |
428 | { $$ = newLOGOP(OP_AND, 0, $1, $3); } |
429 | | expr OROP expr |
430 | { $$ = newLOGOP($2, 0, $1, $3); } |
c963b151 |
431 | | expr DOROP expr |
432 | { $$ = newLOGOP(OP_DOR, 0, $1, $3); } |
fad39ff1 |
433 | | argexpr %prec PREC_LOW |
a0d0e21e |
434 | ; |
435 | |
891be019 |
436 | /* Expressions are a list of terms joined by commas */ |
a0d0e21e |
437 | argexpr : argexpr ',' |
438 | { $$ = $1; } |
439 | | argexpr ',' term |
79072805 |
440 | { $$ = append_elem(OP_LIST, $1, $3); } |
fad39ff1 |
441 | | term %prec PREC_LOW |
8d063cd8 |
442 | ; |
443 | |
891be019 |
444 | /* List operators */ |
ad4673e5 |
445 | listop : LSTOP indirob argexpr /* map {...} @args or print $fh @args */ |
79072805 |
446 | { $$ = 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 |
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 | { $$ = convert($1, 0, $3); } |
ad4673e5 |
474 | | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */ |
a8ff2fa6 |
475 | { SvREFCNT_inc(PL_compcv); |
476 | $3 = newANONATTRSUB($2, 0, Nullop, $3); } |
891be019 |
477 | listexpr %prec LSTOP /* ... @bar */ |
4633a7c4 |
478 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
28757baa |
479 | append_elem(OP_LIST, |
480 | prepend_elem(OP_LIST, $3, $5), $1)); } |
a687059c |
481 | ; |
482 | |
891be019 |
483 | /* Names of methods. May use $object->$methodname */ |
a0d0e21e |
484 | method : METHOD |
485 | | scalar |
486 | ; |
487 | |
891be019 |
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 |
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 |
497 | { $$ = newBINOP(OP_AELEM, 0, |
498 | ref(newAVREF($1),OP_RV2AV), |
499 | scalar($4));} |
891be019 |
500 | | subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */ |
fad39ff1 |
501 | { $$ = newBINOP(OP_AELEM, 0, |
502 | ref(newAVREF($1),OP_RV2AV), |
503 | scalar($3));} |
891be019 |
504 | | scalar '{' expr ';' '}' /* $foo->{bar();} */ |
fad39ff1 |
505 | { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3)); |
506 | PL_expect = XOPERATOR; } |
891be019 |
507 | | term ARROW '{' expr ';' '}' /* somehref->{bar();} */ |
fad39ff1 |
508 | { $$ = 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 |
513 | { $$ = newBINOP(OP_HELEM, 0, |
514 | ref(newHVREF($1),OP_RV2HV), |
515 | jmaybe($3)); |
516 | PL_expect = XOPERATOR; } |
891be019 |
517 | | term ARROW '(' ')' /* $subref->() */ |
fad39ff1 |
518 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
519 | newCVREF(0, scalar($1))); } |
891be019 |
520 | | term ARROW '(' expr ')' /* $subref->(@args) */ |
fad39ff1 |
521 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
522 | append_elem(OP_LIST, $4, |
523 | newCVREF(0, scalar($1)))); } |
524 | |
891be019 |
525 | | subscripted '(' expr ')' /* $foo->{bar}->(@args) */ |
fad39ff1 |
526 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
527 | append_elem(OP_LIST, $3, |
528 | newCVREF(0, scalar($1)))); } |
891be019 |
529 | | subscripted '(' ')' /* $foo->{bar}->() */ |
fad39ff1 |
530 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
531 | newCVREF(0, scalar($1))); } |
9a9798c2 |
532 | | '(' expr ')' '[' expr ']' /* list slice */ |
533 | { $$ = newSLICEOP(0, $5, $2); } |
534 | | '(' ')' '[' expr ']' /* empty list slice! */ |
535 | { $$ = newSLICEOP(0, $4, Nullop); } |
891be019 |
536 | ; |
fad39ff1 |
537 | |
891be019 |
538 | /* Binary operators between terms */ |
539 | termbinop : term ASSIGNOP term /* $x = $y */ |
a0d0e21e |
540 | { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); } |
891be019 |
541 | | term POWOP term /* $x ** $y */ |
79072805 |
542 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 |
543 | | term MULOP term /* $x * $y, $x x $y */ |
79072805 |
544 | { if ($2 != OP_REPEAT) |
545 | scalar($1); |
546 | $$ = 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 | { $$ = newLOGOP(OP_OR, 0, $1, $3); } |
c963b151 |
565 | | term DORDOR term /* $x // $y */ |
566 | { $$ = newLOGOP(OP_DOR, 0, $1, $3); } |
891be019 |
567 | | term MATCHOP term /* $x =~ /$y/ */ |
79072805 |
568 | { $$ = bind_match($2, $1, $3); } |
891be019 |
569 | ; |
8d063cd8 |
570 | |
891be019 |
571 | /* Unary operators and terms */ |
572 | termunop : '-' term %prec UMINUS /* -$x */ |
79072805 |
573 | { $$ = 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 | { $$ = newUNOP(OP_PREDEC, 0, |
463ee0b2 |
591 | mod(scalar($2), OP_PREDEC)); } |
891be019 |
592 | |
593 | ; |
594 | |
595 | /* Constructors for anonymous data */ |
596 | anonymous: '[' expr ']' |
597 | { $$ = newANONLIST($2); } |
598 | | '[' ']' |
599 | { $$ = newANONLIST(Nullop); } |
600 | | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */ |
ecb2f335 |
601 | { $$ = newANONHASH($2); } |
891be019 |
602 | | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */ |
603 | { $$ = newANONHASH(Nullop); } |
604 | | ANONSUB startanonsub proto subattrlist block %prec '(' |
a8ff2fa6 |
605 | { SvREFCNT_inc(PL_compcv); |
606 | $$ = newANONATTRSUB($2, $3, $4, $5); } |
891be019 |
607 | |
608 | ; |
609 | |
610 | /* Things called with "do" */ |
611 | termdo : DO term %prec UNIOP /* do $filename */ |
850e8516 |
612 | { $$ = dofile($2, $1); } |
891be019 |
613 | | DO block %prec '(' /* do { code */ |
614 | { $$ = 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 |
649 | { $$ = newCONDOP(0, $1, $3, $5); } |
650 | | REFGEN term /* \$x, \@y, \%z */ |
651 | { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); } |
09bef843 |
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 | { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));} |
fad39ff1 |
670 | | subscripted |
671 | { $$ = $1; } |
891be019 |
672 | | ary '[' expr ']' /* array slice */ |
79072805 |
673 | { $$ = prepend_elem(OP_ASLICE, |
674 | newOP(OP_PUSHMARK, 0), |
79072805 |
675 | newLISTOP(OP_ASLICE, 0, |
676 | list($3), |
a0d0e21e |
677 | ref($1, OP_ASLICE))); } |
891be019 |
678 | | ary '{' expr ';' '}' /* @hash{@keys} */ |
79072805 |
679 | { $$ = prepend_elem(OP_HSLICE, |
680 | newOP(OP_PUSHMARK, 0), |
79072805 |
681 | newLISTOP(OP_HSLICE, 0, |
682 | list($3), |
a0d0e21e |
683 | ref(oopsHV($1), OP_HSLICE))); |
3280af22 |
684 | PL_expect = XOPERATOR; } |
79072805 |
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 | { $$ = newUNOP($1, 0, $2); } |
a72a1c8b |
710 | | REQUIRE /* require, $_ implied */ |
711 | { $$ = newOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0); } |
712 | | REQUIRE term /* require Foo */ |
713 | { $$ = newUNOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0, $2); } |
3cd0a11a |
714 | | UNIOPSUB |
715 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); } |
891be019 |
716 | | UNIOPSUB term /* Sub treated as unop */ |
4633a7c4 |
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 |
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 |
731 | | PMFUNC '(' argexpr ')' /* m//, s///, tr/// */ |
732 | { $$ = pmruntime($1, $3, 1); } |
79072805 |
733 | | WORD |
378cc40b |
734 | | listop |
8d063cd8 |
735 | ; |
736 | |
891be019 |
737 | /* "my" declarations, with optional attributes */ |
09bef843 |
738 | myattrterm: MY myterm myattrlist |
739 | { $$ = my_attrs($2,$3); } |
740 | | MY myterm |
741 | { $$ = localize($2,$1); } |
742 | ; |
743 | |
891be019 |
744 | /* Things that can be "my"'d */ |
09bef843 |
745 | myterm : '(' expr ')' |
746 | { $$ = 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 | { $$ = Nullop; } |
fad39ff1 |
760 | | argexpr %prec PREC_LOW |
a0d0e21e |
761 | { $$ = $1; } |
762 | ; |
763 | |
764 | listexprcom: /* NULL */ |
765 | { $$ = Nullop; } |
79072805 |
766 | | expr |
767 | { $$ = $1; } |
a0d0e21e |
768 | | expr ',' |
769 | { $$ = $1; } |
79072805 |
770 | ; |
771 | |
891be019 |
772 | /* A little bit of trickery to make "for my $foo (@bar)" actually be |
773 | lexical */ |
55497cff |
774 | my_scalar: scalar |
3280af22 |
775 | { PL_in_my = 0; $$ = my($1); } |
55497cff |
776 | ; |
777 | |
79072805 |
778 | amper : '&' indirob |
c07a80fd |
779 | { $$ = newCVREF($1,$2); } |
a687059c |
780 | ; |
781 | |
79072805 |
782 | scalar : '$' indirob |
783 | { $$ = newSVREF($2); } |
a687059c |
784 | ; |
785 | |
79072805 |
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 |
800 | ; |
801 | |
891be019 |
802 | /* Indirect objects */ |
79072805 |
803 | indirob : WORD |
804 | { $$ = scalar($1); } |
fad39ff1 |
805 | | scalar %prec PREC_LOW |
463ee0b2 |
806 | { $$ = scalar($1); } |
79072805 |
807 | | block |
a0d0e21e |
808 | { $$ = scope($1); } |
79072805 |
809 | |
93a17b20 |
810 | | PRIVATEREF |
811 | { $$ = $1; } |
8d063cd8 |
812 | ; |