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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; |
33 | OP *opval; |
34 | GV *gvval; |
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35 | } |
36 | |
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37 | %token <ival> '{' |
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38 | |
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39 | %token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF |
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40 | %token <opval> FUNC0SUB UNIOPSUB LSTOPSUB |
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41 | %token <pval> LABEL |
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42 | %token <ival> FORMAT SUB ANONSUB PACKAGE USE |
79072805 |
43 | %token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR |
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44 | %token <ival> GIVEN WHEN DEFAULT |
79072805 |
45 | %token <ival> LOOPEX DOTDOT |
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46 | %token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP |
79072805 |
47 | %token <ival> RELOP EQOP MULOP ADDOP |
55497cff |
48 | %token <ival> DOLSHARP DO HASHBRACK NOAMP |
a72a1c8b |
49 | %token <ival> LOCAL MY MYSUB REQUIRE |
09bef843 |
50 | %token COLONATTR |
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51 | |
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52 | %type <ival> prog decl format startsub startanonsub startformsub mintro |
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53 | %type <ival> progstart remember mremember '&' savescope mydefsv |
bbce6d69 |
54 | %type <opval> block mblock lineseq line loop cond else |
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55 | %type <opval> expr term subscripted scalar ary hsh arylen star amper sideff |
a034e688 |
56 | %type <opval> argexpr nexpr texpr iexpr mexpr mnexpr miexpr |
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57 | %type <opval> listexpr listexprcom indirob listop method |
58 | %type <opval> formname subname proto subbody cont my_scalar |
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59 | %type <opval> subattrlist myattrlist mysubrout myattrterm myterm |
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60 | %type <opval> termbinop termunop anonymous termdo |
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61 | %type <opval> switch case |
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62 | %type <pval> label |
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63 | |
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64 | %nonassoc PREC_LOW |
65 | %nonassoc LOOPEX |
66 | |
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67 | %left <ival> OROP DOROP |
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68 | %left ANDOP |
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69 | %right NOTOP |
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70 | %nonassoc LSTOP LSTOPSUB |
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71 | %left ',' |
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72 | %right <ival> ASSIGNOP |
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73 | %right '?' ':' |
74 | %nonassoc DOTDOT |
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75 | %left OROR DORDOR |
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76 | %left ANDAND |
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77 | %left <ival> BITOROP |
78 | %left <ival> BITANDOP |
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79 | %nonassoc EQOP |
80 | %nonassoc RELOP |
36477c24 |
81 | %nonassoc UNIOP UNIOPSUB |
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82 | %nonassoc REQUIRE |
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83 | %left <ival> SHIFTOP |
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84 | %left ADDOP |
85 | %left MULOP |
8990e307 |
86 | %left <ival> MATCHOP |
79072805 |
87 | %right '!' '~' UMINUS REFGEN |
88 | %right <ival> POWOP |
89 | %nonassoc PREINC PREDEC POSTINC POSTDEC |
8990e307 |
90 | %left ARROW |
fad39ff1 |
91 | %nonassoc <ival> ')' |
8d063cd8 |
92 | %left '(' |
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93 | %left '[' '{' |
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94 | |
95 | %% /* RULES */ |
96 | |
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97 | /* The whole program */ |
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98 | prog : progstart |
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99 | /*CONTINUED*/ lineseq |
ecb2f335 |
100 | { $$ = $1; newPROG(block_end($1,$2)); } |
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101 | ; |
102 | |
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103 | /* An ordinary block */ |
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104 | block : '{' remember lineseq '}' |
3280af22 |
105 | { if (PL_copline > (line_t)$1) |
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106 | PL_copline = (line_t)$1; |
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107 | $$ = block_end($2, $3); } |
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108 | ; |
109 | |
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110 | remember: /* NULL */ /* start a full lexical scope */ |
111 | { $$ = block_start(TRUE); } |
112 | ; |
113 | |
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114 | mydefsv: /* NULL */ /* lexicalize $_ */ |
115 | { $$ = (I32) allocmy("$_"); } |
116 | ; |
117 | |
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118 | progstart: |
119 | { |
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120 | PL_expect = XSTATE; $$ = block_start(TRUE); |
121 | } |
122 | ; |
123 | |
124 | |
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125 | mblock : '{' mremember lineseq '}' |
3280af22 |
126 | { if (PL_copline > (line_t)$1) |
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127 | PL_copline = (line_t)$1; |
36477c24 |
128 | $$ = block_end($2, $3); } |
55497cff |
129 | ; |
130 | |
131 | mremember: /* NULL */ /* start a partial lexical scope */ |
132 | { $$ = block_start(FALSE); } |
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133 | ; |
134 | |
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135 | savescope: /* NULL */ /* remember stack pos in case of error */ |
136 | { $$ = PL_savestack_ix; } |
137 | |
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138 | /* A collection of "lines" in the program */ |
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139 | lineseq : /* NULL */ |
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140 | { $$ = Nullop; } |
141 | | lineseq decl |
142 | { $$ = $1; } |
500bedb6 |
143 | | lineseq savescope line |
144 | { LEAVE_SCOPE($2); |
145 | $$ = append_list(OP_LINESEQ, |
146 | (LISTOP*)$1, (LISTOP*)$3); |
3280af22 |
147 | PL_pad_reset_pending = TRUE; |
500bedb6 |
148 | if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; } |
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149 | ; |
150 | |
891be019 |
151 | /* A "line" in the program */ |
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152 | line : label cond |
153 | { $$ = newSTATEOP(0, $1, $2); } |
8d063cd8 |
154 | | loop /* loops add their own labels */ |
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155 | | switch /* ... and so do switches */ |
156 | { $$ = $1; } |
157 | | label case |
158 | { $$ = newSTATEOP(0, $1, $2); } |
8d063cd8 |
159 | | label ';' |
160 | { if ($1 != Nullch) { |
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161 | $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0)); |
450a55e4 |
162 | } |
163 | else { |
79072805 |
164 | $$ = Nullop; |
3280af22 |
165 | PL_copline = NOLINE; |
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166 | } |
3280af22 |
167 | PL_expect = XSTATE; } |
8d063cd8 |
168 | | label sideff ';' |
79072805 |
169 | { $$ = newSTATEOP(0, $1, $2); |
3280af22 |
170 | PL_expect = XSTATE; } |
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171 | ; |
172 | |
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173 | /* An expression which may have a side-effect */ |
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174 | sideff : error |
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175 | { $$ = Nullop; } |
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176 | | expr |
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177 | { $$ = $1; } |
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178 | | expr IF expr |
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179 | { $$ = newLOGOP(OP_AND, 0, $3, $1); } |
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180 | | expr UNLESS expr |
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181 | { $$ = newLOGOP(OP_OR, 0, $3, $1); } |
a687059c |
182 | | expr WHILE expr |
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183 | { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); } |
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184 | | expr UNTIL iexpr |
185 | { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);} |
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186 | | expr FOR expr |
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187 | { $$ = newFOROP(0, Nullch, (line_t)$2, |
ecca16b0 |
188 | Nullop, $3, $1, Nullop); } |
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189 | ; |
190 | |
891be019 |
191 | /* else and elsif blocks */ |
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192 | else : /* NULL */ |
193 | { $$ = Nullop; } |
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194 | | ELSE mblock |
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195 | { ($2)->op_flags |= OPf_PARENS; $$ = scope($2); } |
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196 | | ELSIF '(' mexpr ')' mblock else |
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197 | { PL_copline = (line_t)$1; |
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198 | $$ = newCONDOP(0, $3, scope($5), $6); |
3280af22 |
199 | PL_hints |= HINT_BLOCK_SCOPE; } |
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200 | ; |
201 | |
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202 | /* Real conditional expressions */ |
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203 | cond : IF '(' remember mexpr ')' mblock else |
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204 | { PL_copline = (line_t)$1; |
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205 | $$ = block_end($3, |
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206 | newCONDOP(0, $4, scope($6), $7)); } |
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207 | | UNLESS '(' remember miexpr ')' mblock else |
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208 | { PL_copline = (line_t)$1; |
36477c24 |
209 | $$ = block_end($3, |
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210 | newCONDOP(0, $4, scope($6), $7)); } |
79072805 |
211 | ; |
212 | |
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213 | /* Cases for a switch statement */ |
214 | case : WHEN '(' remember mexpr ')' mblock |
215 | { $$ = block_end($3, |
216 | newWHENOP($4, scope($6))); } |
217 | | DEFAULT block |
218 | { $$ = newWHENOP(0, scope($2)); } |
219 | ; |
220 | |
891be019 |
221 | /* Continue blocks */ |
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222 | cont : /* NULL */ |
223 | { $$ = Nullop; } |
224 | | CONTINUE block |
225 | { $$ = scope($2); } |
226 | ; |
227 | |
891be019 |
228 | /* Loops: while, until, for, and a bare block */ |
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229 | loop : label WHILE '(' remember texpr ')' mintro mblock cont |
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230 | { PL_copline = (line_t)$2; |
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231 | $$ = block_end($4, |
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232 | newSTATEOP(0, $1, |
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233 | newWHILEOP(0, 1, (LOOP*)Nullop, |
a034e688 |
234 | $2, $5, $8, $9, $7))); } |
235 | | label UNTIL '(' remember iexpr ')' mintro mblock cont |
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236 | { PL_copline = (line_t)$2; |
36477c24 |
237 | $$ = block_end($4, |
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238 | newSTATEOP(0, $1, |
bbce6d69 |
239 | newWHILEOP(0, 1, (LOOP*)Nullop, |
a034e688 |
240 | $2, $5, $8, $9, $7))); } |
bbce6d69 |
241 | | label FOR MY remember my_scalar '(' mexpr ')' mblock cont |
36477c24 |
242 | { $$ = block_end($4, |
eb160463 |
243 | newFOROP(0, $1, (line_t)$2, $5, $7, $9, $10)); } |
bbce6d69 |
244 | | label FOR scalar '(' remember mexpr ')' mblock cont |
36477c24 |
245 | { $$ = block_end($5, |
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246 | newFOROP(0, $1, (line_t)$2, mod($3, OP_ENTERLOOP), |
bbce6d69 |
247 | $6, $8, $9)); } |
248 | | label FOR '(' remember mexpr ')' mblock cont |
36477c24 |
249 | { $$ = block_end($4, |
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250 | newFOROP(0, $1, (line_t)$2, Nullop, $5, $7, $8)); } |
a034e688 |
251 | | label FOR '(' remember mnexpr ';' texpr ';' mintro mnexpr ')' |
252 | mblock |
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253 | /* basically fake up an initialize-while lineseq */ |
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254 | { OP *forop; |
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255 | PL_copline = (line_t)$2; |
36c66720 |
256 | forop = newSTATEOP(0, $1, |
257 | newWHILEOP(0, 1, (LOOP*)Nullop, |
258 | $2, scalar($7), |
a034e688 |
259 | $12, $10, $9)); |
36c66720 |
260 | if ($5) { |
261 | forop = append_elem(OP_LINESEQ, |
262 | newSTATEOP(0, ($1?savepv($1):Nullch), |
263 | $5), |
264 | forop); |
265 | } |
266 | |
267 | $$ = block_end($4, forop); } |
79072805 |
268 | | label block cont /* a block is a loop that happens once */ |
fb73857a |
269 | { $$ = newSTATEOP(0, $1, |
270 | newWHILEOP(0, 1, (LOOP*)Nullop, |
a034e688 |
271 | NOLINE, Nullop, $2, $3, 0)); } |
8d063cd8 |
272 | ; |
273 | |
0d863452 |
274 | /* Switch blocks */ |
275 | switch : label GIVEN '(' remember mydefsv mexpr ')' mblock |
276 | { PL_copline = (line_t) $2; |
277 | $$ = block_end($4, |
278 | newSTATEOP(0, $1, |
279 | newGIVENOP($6, scope($8), |
280 | (PADOFFSET) $5) )); } |
281 | ; |
282 | |
a034e688 |
283 | /* determine whether there are any new my declarations */ |
284 | mintro : /* NULL */ |
285 | { $$ = (PL_min_intro_pending && |
286 | PL_max_intro_pending >= PL_min_intro_pending); |
287 | intro_my(); } |
288 | |
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289 | /* Normal expression */ |
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290 | nexpr : /* NULL */ |
79072805 |
291 | { $$ = Nullop; } |
8d063cd8 |
292 | | sideff |
293 | ; |
294 | |
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295 | /* Boolean expression */ |
8d063cd8 |
296 | texpr : /* NULL means true */ |
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297 | { (void)scan_num("1", &yylval); $$ = yylval.opval; } |
8d063cd8 |
298 | | expr |
299 | ; |
300 | |
891be019 |
301 | /* Inverted boolean expression */ |
55497cff |
302 | iexpr : expr |
303 | { $$ = invert(scalar($1)); } |
304 | ; |
305 | |
891be019 |
306 | /* Expression with its own lexical scope */ |
55497cff |
307 | mexpr : expr |
bbce6d69 |
308 | { $$ = $1; intro_my(); } |
309 | ; |
310 | |
311 | mnexpr : nexpr |
312 | { $$ = $1; intro_my(); } |
55497cff |
313 | ; |
314 | |
55497cff |
315 | miexpr : iexpr |
bbce6d69 |
316 | { $$ = $1; intro_my(); } |
55497cff |
317 | ; |
318 | |
891be019 |
319 | /* Optional "MAIN:"-style loop labels */ |
8d063cd8 |
320 | label : /* empty */ |
321 | { $$ = Nullch; } |
32c2e4fb |
322 | | LABEL |
8d063cd8 |
323 | ; |
324 | |
891be019 |
325 | /* Some kind of declaration - does not take part in the parse tree */ |
8d063cd8 |
326 | decl : format |
327 | { $$ = 0; } |
328 | | subrout |
329 | { $$ = 0; } |
09bef843 |
330 | | mysubrout |
331 | { $$ = 0; } |
a687059c |
332 | | package |
333 | { $$ = 0; } |
a0d0e21e |
334 | | use |
85e6fe83 |
335 | { $$ = 0; } |
8d063cd8 |
336 | ; |
337 | |
44a8e56a |
338 | format : FORMAT startformsub formname block |
a0d0e21e |
339 | { newFORM($2, $3, $4); } |
44a8e56a |
340 | ; |
341 | |
342 | formname: WORD { $$ = $1; } |
343 | | /* NULL */ { $$ = Nullop; } |
8d063cd8 |
344 | ; |
345 | |
891be019 |
346 | /* Unimplemented "my sub foo { }" */ |
09bef843 |
347 | mysubrout: MYSUB startsub subname proto subattrlist subbody |
348 | { newMYSUB($2, $3, $4, $5, $6); } |
349 | ; |
350 | |
891be019 |
351 | /* Subroutine definition */ |
09bef843 |
352 | subrout : SUB startsub subname proto subattrlist subbody |
353 | { newATTRSUB($2, $3, $4, $5, $6); } |
28757baa |
354 | ; |
355 | |
fa83b5b6 |
356 | startsub: /* NULL */ /* start a regular subroutine scope */ |
774d564b |
357 | { $$ = start_subparse(FALSE, 0); } |
28757baa |
358 | ; |
359 | |
360 | startanonsub: /* NULL */ /* start an anonymous subroutine scope */ |
774d564b |
361 | { $$ = start_subparse(FALSE, CVf_ANON); } |
28757baa |
362 | ; |
363 | |
44a8e56a |
364 | startformsub: /* NULL */ /* start a format subroutine scope */ |
774d564b |
365 | { $$ = start_subparse(TRUE, 0); } |
44a8e56a |
366 | ; |
367 | |
891be019 |
368 | /* Name of a subroutine - must be a bareword, could be special */ |
2596d9fe |
369 | subname : WORD { const char *const name = SvPV_nolen_const(((SVOP*)$1)->op_sv); |
e858de61 |
370 | if (strEQ(name, "BEGIN") || strEQ(name, "END") |
7d30b5c4 |
371 | || strEQ(name, "INIT") || strEQ(name, "CHECK")) |
1aff0e91 |
372 | CvSPECIAL_on(PL_compcv); |
28757baa |
373 | $$ = $1; } |
a0d0e21e |
374 | ; |
375 | |
891be019 |
376 | /* Subroutine prototype */ |
4633a7c4 |
377 | proto : /* NULL */ |
378 | { $$ = Nullop; } |
379 | | THING |
380 | ; |
28757baa |
381 | |
891be019 |
382 | /* Optional list of subroutine attributes */ |
09bef843 |
383 | subattrlist: /* NULL */ |
384 | { $$ = Nullop; } |
385 | | COLONATTR THING |
386 | { $$ = $2; } |
387 | | COLONATTR |
388 | { $$ = Nullop; } |
389 | ; |
390 | |
891be019 |
391 | /* List of attributes for a "my" variable declaration */ |
09bef843 |
392 | myattrlist: COLONATTR THING |
393 | { $$ = $2; } |
394 | | COLONATTR |
395 | { $$ = Nullop; } |
396 | ; |
397 | |
891be019 |
398 | /* Subroutine body - either null or a block */ |
28757baa |
399 | subbody : block { $$ = $1; } |
3280af22 |
400 | | ';' { $$ = Nullop; PL_expect = XSTATE; } |
8d063cd8 |
401 | ; |
402 | |
a687059c |
403 | package : PACKAGE WORD ';' |
79072805 |
404 | { package($2); } |
a687059c |
405 | ; |
406 | |
28757baa |
407 | use : USE startsub |
1aff0e91 |
408 | { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ } |
28757baa |
409 | WORD WORD listexpr ';' |
410 | { utilize($1, $2, $4, $5, $6); } |
85e6fe83 |
411 | ; |
412 | |
891be019 |
413 | /* Ordinary expressions; logical combinations */ |
a0d0e21e |
414 | expr : expr ANDOP expr |
415 | { $$ = newLOGOP(OP_AND, 0, $1, $3); } |
416 | | expr OROP expr |
417 | { $$ = newLOGOP($2, 0, $1, $3); } |
c963b151 |
418 | | expr DOROP expr |
419 | { $$ = newLOGOP(OP_DOR, 0, $1, $3); } |
fad39ff1 |
420 | | argexpr %prec PREC_LOW |
a0d0e21e |
421 | ; |
422 | |
891be019 |
423 | /* Expressions are a list of terms joined by commas */ |
a0d0e21e |
424 | argexpr : argexpr ',' |
425 | { $$ = $1; } |
426 | | argexpr ',' term |
79072805 |
427 | { $$ = append_elem(OP_LIST, $1, $3); } |
fad39ff1 |
428 | | term %prec PREC_LOW |
8d063cd8 |
429 | ; |
430 | |
891be019 |
431 | /* List operators */ |
ad4673e5 |
432 | listop : LSTOP indirob argexpr /* map {...} @args or print $fh @args */ |
79072805 |
433 | { $$ = convert($1, OPf_STACKED, |
a0d0e21e |
434 | prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); } |
891be019 |
435 | | FUNC '(' indirob expr ')' /* print ($fh @args */ |
79072805 |
436 | { $$ = convert($1, OPf_STACKED, |
a0d0e21e |
437 | prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); } |
891be019 |
438 | | term ARROW method '(' listexprcom ')' /* $foo->bar(list) */ |
4633a7c4 |
439 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e |
440 | append_elem(OP_LIST, |
55497cff |
441 | prepend_elem(OP_LIST, scalar($1), $5), |
a0d0e21e |
442 | newUNOP(OP_METHOD, 0, $3))); } |
891be019 |
443 | | term ARROW method /* $foo->bar */ |
b1524f17 |
444 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
445 | append_elem(OP_LIST, scalar($1), |
446 | newUNOP(OP_METHOD, 0, $3))); } |
891be019 |
447 | | METHOD indirob listexpr /* new Class @args */ |
4633a7c4 |
448 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e |
449 | append_elem(OP_LIST, |
4633a7c4 |
450 | prepend_elem(OP_LIST, $2, $3), |
a0d0e21e |
451 | newUNOP(OP_METHOD, 0, $1))); } |
891be019 |
452 | | FUNCMETH indirob '(' listexprcom ')' /* method $object (@args) */ |
4633a7c4 |
453 | { $$ = convert(OP_ENTERSUB, OPf_STACKED, |
a0d0e21e |
454 | append_elem(OP_LIST, |
4633a7c4 |
455 | prepend_elem(OP_LIST, $2, $4), |
a0d0e21e |
456 | newUNOP(OP_METHOD, 0, $1))); } |
891be019 |
457 | | LSTOP listexpr /* print @args */ |
79072805 |
458 | { $$ = convert($1, 0, $2); } |
891be019 |
459 | | FUNC '(' listexprcom ')' /* print (@args) */ |
79072805 |
460 | { $$ = convert($1, 0, $3); } |
ad4673e5 |
461 | | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */ |
09bef843 |
462 | { $3 = newANONATTRSUB($2, 0, Nullop, $3); } |
891be019 |
463 | listexpr %prec LSTOP /* ... @bar */ |
4633a7c4 |
464 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
28757baa |
465 | append_elem(OP_LIST, |
466 | prepend_elem(OP_LIST, $3, $5), $1)); } |
a687059c |
467 | ; |
468 | |
891be019 |
469 | /* Names of methods. May use $object->$methodname */ |
a0d0e21e |
470 | method : METHOD |
471 | | scalar |
472 | ; |
473 | |
891be019 |
474 | /* Some kind of subscripted expression */ |
475 | subscripted: star '{' expr ';' '}' /* *main::{something} */ |
476 | /* In this and all the hash accessors, ';' is |
477 | * provided by the tokeniser */ |
264e1af3 |
478 | { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); |
479 | PL_expect = XOPERATOR; } |
891be019 |
480 | | scalar '[' expr ']' /* $array[$element] */ |
fad39ff1 |
481 | { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); } |
891be019 |
482 | | term ARROW '[' expr ']' /* somearef->[$element] */ |
fad39ff1 |
483 | { $$ = newBINOP(OP_AELEM, 0, |
484 | ref(newAVREF($1),OP_RV2AV), |
485 | scalar($4));} |
891be019 |
486 | | subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */ |
fad39ff1 |
487 | { $$ = newBINOP(OP_AELEM, 0, |
488 | ref(newAVREF($1),OP_RV2AV), |
489 | scalar($3));} |
891be019 |
490 | | scalar '{' expr ';' '}' /* $foo->{bar();} */ |
fad39ff1 |
491 | { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3)); |
492 | PL_expect = XOPERATOR; } |
891be019 |
493 | | term ARROW '{' expr ';' '}' /* somehref->{bar();} */ |
fad39ff1 |
494 | { $$ = newBINOP(OP_HELEM, 0, |
495 | ref(newHVREF($1),OP_RV2HV), |
496 | jmaybe($4)); |
497 | PL_expect = XOPERATOR; } |
891be019 |
498 | | subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */ |
fad39ff1 |
499 | { $$ = newBINOP(OP_HELEM, 0, |
500 | ref(newHVREF($1),OP_RV2HV), |
501 | jmaybe($3)); |
502 | PL_expect = XOPERATOR; } |
891be019 |
503 | | term ARROW '(' ')' /* $subref->() */ |
fad39ff1 |
504 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
505 | newCVREF(0, scalar($1))); } |
891be019 |
506 | | term ARROW '(' expr ')' /* $subref->(@args) */ |
fad39ff1 |
507 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
508 | append_elem(OP_LIST, $4, |
509 | newCVREF(0, scalar($1)))); } |
510 | |
891be019 |
511 | | subscripted '(' expr ')' /* $foo->{bar}->(@args) */ |
fad39ff1 |
512 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
513 | append_elem(OP_LIST, $3, |
514 | newCVREF(0, scalar($1)))); } |
891be019 |
515 | | subscripted '(' ')' /* $foo->{bar}->() */ |
fad39ff1 |
516 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
517 | newCVREF(0, scalar($1))); } |
9a9798c2 |
518 | | '(' expr ')' '[' expr ']' /* list slice */ |
519 | { $$ = newSLICEOP(0, $5, $2); } |
520 | | '(' ')' '[' expr ']' /* empty list slice! */ |
521 | { $$ = newSLICEOP(0, $4, Nullop); } |
891be019 |
522 | ; |
fad39ff1 |
523 | |
891be019 |
524 | /* Binary operators between terms */ |
525 | termbinop : term ASSIGNOP term /* $x = $y */ |
a0d0e21e |
526 | { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); } |
891be019 |
527 | | term POWOP term /* $x ** $y */ |
79072805 |
528 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 |
529 | | term MULOP term /* $x * $y, $x x $y */ |
79072805 |
530 | { if ($2 != OP_REPEAT) |
531 | scalar($1); |
532 | $$ = newBINOP($2, 0, $1, scalar($3)); } |
891be019 |
533 | | term ADDOP term /* $x + $y */ |
79072805 |
534 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 |
535 | | term SHIFTOP term /* $x >> $y, $x << $y */ |
79072805 |
536 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 |
537 | | term RELOP term /* $x > $y, etc. */ |
79072805 |
538 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 |
539 | | term EQOP term /* $x == $y, $x eq $y */ |
79072805 |
540 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 |
541 | | term BITANDOP term /* $x & $y */ |
79072805 |
542 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 |
543 | | term BITOROP term /* $x | $y */ |
79072805 |
544 | { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } |
891be019 |
545 | | term DOTDOT term /* $x..$y, $x...$y */ |
79072805 |
546 | { $$ = newRANGE($2, scalar($1), scalar($3));} |
891be019 |
547 | | term ANDAND term /* $x && $y */ |
463ee0b2 |
548 | { $$ = newLOGOP(OP_AND, 0, $1, $3); } |
891be019 |
549 | | term OROR term /* $x || $y */ |
463ee0b2 |
550 | { $$ = newLOGOP(OP_OR, 0, $1, $3); } |
c963b151 |
551 | | term DORDOR term /* $x // $y */ |
552 | { $$ = newLOGOP(OP_DOR, 0, $1, $3); } |
891be019 |
553 | | term MATCHOP term /* $x =~ /$y/ */ |
79072805 |
554 | { $$ = bind_match($2, $1, $3); } |
891be019 |
555 | ; |
8d063cd8 |
556 | |
891be019 |
557 | /* Unary operators and terms */ |
558 | termunop : '-' term %prec UMINUS /* -$x */ |
79072805 |
559 | { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); } |
891be019 |
560 | | '+' term %prec UMINUS /* +$x */ |
a687059c |
561 | { $$ = $2; } |
891be019 |
562 | | '!' term /* !$x */ |
79072805 |
563 | { $$ = newUNOP(OP_NOT, 0, scalar($2)); } |
891be019 |
564 | | '~' term /* ~$x */ |
79072805 |
565 | { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));} |
891be019 |
566 | | term POSTINC /* $x++ */ |
79072805 |
567 | { $$ = newUNOP(OP_POSTINC, 0, |
463ee0b2 |
568 | mod(scalar($1), OP_POSTINC)); } |
891be019 |
569 | | term POSTDEC /* $x-- */ |
79072805 |
570 | { $$ = newUNOP(OP_POSTDEC, 0, |
463ee0b2 |
571 | mod(scalar($1), OP_POSTDEC)); } |
891be019 |
572 | | PREINC term /* ++$x */ |
79072805 |
573 | { $$ = newUNOP(OP_PREINC, 0, |
463ee0b2 |
574 | mod(scalar($2), OP_PREINC)); } |
891be019 |
575 | | PREDEC term /* --$x */ |
79072805 |
576 | { $$ = newUNOP(OP_PREDEC, 0, |
463ee0b2 |
577 | mod(scalar($2), OP_PREDEC)); } |
891be019 |
578 | |
579 | ; |
580 | |
581 | /* Constructors for anonymous data */ |
582 | anonymous: '[' expr ']' |
583 | { $$ = newANONLIST($2); } |
584 | | '[' ']' |
585 | { $$ = newANONLIST(Nullop); } |
586 | | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */ |
ecb2f335 |
587 | { $$ = newANONHASH($2); } |
891be019 |
588 | | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */ |
589 | { $$ = newANONHASH(Nullop); } |
590 | | ANONSUB startanonsub proto subattrlist block %prec '(' |
591 | { $$ = newANONATTRSUB($2, $3, $4, $5); } |
592 | |
593 | ; |
594 | |
595 | /* Things called with "do" */ |
596 | termdo : DO term %prec UNIOP /* do $filename */ |
850e8516 |
597 | { $$ = dofile($2, $1); } |
891be019 |
598 | | DO block %prec '(' /* do { code */ |
599 | { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); } |
600 | | DO WORD '(' ')' /* do somesub() */ |
601 | { $$ = newUNOP(OP_ENTERSUB, |
602 | OPf_SPECIAL|OPf_STACKED, |
603 | prepend_elem(OP_LIST, |
604 | scalar(newCVREF( |
605 | (OPpENTERSUB_AMPER<<8), |
606 | scalar($2) |
607 | )),Nullop)); dep();} |
608 | | DO WORD '(' expr ')' /* do somesub(@args) */ |
609 | { $$ = newUNOP(OP_ENTERSUB, |
610 | OPf_SPECIAL|OPf_STACKED, |
611 | append_elem(OP_LIST, |
612 | $4, |
613 | scalar(newCVREF( |
614 | (OPpENTERSUB_AMPER<<8), |
615 | scalar($2) |
616 | )))); dep();} |
617 | | DO scalar '(' ')' /* do $subref () */ |
618 | { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED, |
619 | prepend_elem(OP_LIST, |
620 | scalar(newCVREF(0,scalar($2))), Nullop)); dep();} |
621 | | DO scalar '(' expr ')' /* do $subref (@args) */ |
622 | { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED, |
623 | prepend_elem(OP_LIST, |
624 | $4, |
625 | scalar(newCVREF(0,scalar($2))))); dep();} |
626 | |
627 | ; |
628 | |
629 | term : termbinop |
630 | | termunop |
631 | | anonymous |
632 | | termdo |
e9bdcc27 |
633 | | term '?' term ':' term |
891be019 |
634 | { $$ = newCONDOP(0, $1, $3, $5); } |
635 | | REFGEN term /* \$x, \@y, \%z */ |
636 | { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); } |
09bef843 |
637 | | myattrterm %prec UNIOP |
638 | { $$ = $1; } |
639 | | LOCAL term %prec UNIOP |
93a17b20 |
640 | { $$ = localize($2,$1); } |
a0d0e21e |
641 | | '(' expr ')' |
79072805 |
642 | { $$ = sawparens($2); } |
8d063cd8 |
643 | | '(' ')' |
8990e307 |
644 | { $$ = sawparens(newNULLLIST()); } |
79072805 |
645 | | scalar %prec '(' |
8d063cd8 |
646 | { $$ = $1; } |
79072805 |
647 | | star %prec '(' |
8d063cd8 |
648 | { $$ = $1; } |
79072805 |
649 | | hsh %prec '(' |
8d063cd8 |
650 | { $$ = $1; } |
79072805 |
651 | | ary %prec '(' |
8d063cd8 |
652 | { $$ = $1; } |
891be019 |
653 | | arylen %prec '(' /* $#x, $#{ something } */ |
79072805 |
654 | { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));} |
fad39ff1 |
655 | | subscripted |
656 | { $$ = $1; } |
891be019 |
657 | | ary '[' expr ']' /* array slice */ |
79072805 |
658 | { $$ = prepend_elem(OP_ASLICE, |
659 | newOP(OP_PUSHMARK, 0), |
79072805 |
660 | newLISTOP(OP_ASLICE, 0, |
661 | list($3), |
a0d0e21e |
662 | ref($1, OP_ASLICE))); } |
891be019 |
663 | | ary '{' expr ';' '}' /* @hash{@keys} */ |
79072805 |
664 | { $$ = prepend_elem(OP_HSLICE, |
665 | newOP(OP_PUSHMARK, 0), |
79072805 |
666 | newLISTOP(OP_HSLICE, 0, |
667 | list($3), |
a0d0e21e |
668 | ref(oopsHV($1), OP_HSLICE))); |
3280af22 |
669 | PL_expect = XOPERATOR; } |
79072805 |
670 | | THING %prec '(' |
671 | { $$ = $1; } |
891be019 |
672 | | amper /* &foo; */ |
c07a80fd |
673 | { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); } |
ecb2f335 |
674 | | amper '(' ')' /* &foo() */ |
a0d0e21e |
675 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); } |
891be019 |
676 | | amper '(' expr ')' /* &foo(@args) */ |
a0d0e21e |
677 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
4633a7c4 |
678 | append_elem(OP_LIST, $3, scalar($1))); } |
891be019 |
679 | | NOAMP WORD listexpr /* foo(@args) */ |
a0d0e21e |
680 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
a5f75d66 |
681 | append_elem(OP_LIST, $3, scalar($2))); } |
891be019 |
682 | | LOOPEX /* loop exiting command (goto, last, dump, etc) */ |
85e6fe83 |
683 | { $$ = newOP($1, OPf_SPECIAL); |
3280af22 |
684 | PL_hints |= HINT_BLOCK_SCOPE; } |
a0d0e21e |
685 | | LOOPEX term |
8990e307 |
686 | { $$ = newLOOPEX($1,$2); } |
891be019 |
687 | | NOTOP argexpr /* not $foo */ |
c07a80fd |
688 | { $$ = newUNOP(OP_NOT, 0, scalar($2)); } |
891be019 |
689 | | UNIOP /* Unary op, $_ implied */ |
79072805 |
690 | { $$ = newOP($1, 0); } |
30173ab5 |
691 | | UNIOP block /* eval { foo } */ |
79072805 |
692 | { $$ = newUNOP($1, 0, $2); } |
891be019 |
693 | | UNIOP term /* Unary op */ |
79072805 |
694 | { $$ = newUNOP($1, 0, $2); } |
a72a1c8b |
695 | | REQUIRE /* require, $_ implied */ |
696 | { $$ = newOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0); } |
697 | | REQUIRE term /* require Foo */ |
698 | { $$ = newUNOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0, $2); } |
891be019 |
699 | | UNIOPSUB term /* Sub treated as unop */ |
4633a7c4 |
700 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
701 | append_elem(OP_LIST, $2, scalar($1))); } |
891be019 |
702 | | FUNC0 /* Nullary operator */ |
79072805 |
703 | { $$ = newOP($1, 0); } |
ae986130 |
704 | | FUNC0 '(' ')' |
79072805 |
705 | { $$ = newOP($1, 0); } |
891be019 |
706 | | FUNC0SUB /* Sub treated as nullop */ |
28757baa |
707 | { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, |
4633a7c4 |
708 | scalar($1)); } |
891be019 |
709 | | FUNC1 '(' ')' /* not () */ |
a758b0b5 |
710 | { $$ = $1 == OP_NOT ? newUNOP($1, 0, newSVOP(OP_CONST, 0, newSViv(0))) |
711 | : newOP($1, OPf_SPECIAL); } |
891be019 |
712 | | FUNC1 '(' expr ')' /* not($foo) */ |
79072805 |
713 | { $$ = newUNOP($1, 0, $3); } |
131b3ad0 |
714 | | PMFUNC '(' argexpr ')' /* m//, s///, tr/// */ |
715 | { $$ = pmruntime($1, $3, 1); } |
79072805 |
716 | | WORD |
378cc40b |
717 | | listop |
8d063cd8 |
718 | ; |
719 | |
891be019 |
720 | /* "my" declarations, with optional attributes */ |
09bef843 |
721 | myattrterm: MY myterm myattrlist |
722 | { $$ = my_attrs($2,$3); } |
723 | | MY myterm |
724 | { $$ = localize($2,$1); } |
725 | ; |
726 | |
891be019 |
727 | /* Things that can be "my"'d */ |
09bef843 |
728 | myterm : '(' expr ')' |
729 | { $$ = sawparens($2); } |
730 | | '(' ')' |
731 | { $$ = sawparens(newNULLLIST()); } |
732 | | scalar %prec '(' |
733 | { $$ = $1; } |
734 | | hsh %prec '(' |
735 | { $$ = $1; } |
736 | | ary %prec '(' |
737 | { $$ = $1; } |
738 | ; |
739 | |
891be019 |
740 | /* Basic list expressions */ |
fad39ff1 |
741 | listexpr: /* NULL */ %prec PREC_LOW |
8990e307 |
742 | { $$ = Nullop; } |
fad39ff1 |
743 | | argexpr %prec PREC_LOW |
a0d0e21e |
744 | { $$ = $1; } |
745 | ; |
746 | |
747 | listexprcom: /* NULL */ |
748 | { $$ = Nullop; } |
79072805 |
749 | | expr |
750 | { $$ = $1; } |
a0d0e21e |
751 | | expr ',' |
752 | { $$ = $1; } |
79072805 |
753 | ; |
754 | |
891be019 |
755 | /* A little bit of trickery to make "for my $foo (@bar)" actually be |
756 | lexical */ |
55497cff |
757 | my_scalar: scalar |
3280af22 |
758 | { PL_in_my = 0; $$ = my($1); } |
55497cff |
759 | ; |
760 | |
79072805 |
761 | amper : '&' indirob |
c07a80fd |
762 | { $$ = newCVREF($1,$2); } |
a687059c |
763 | ; |
764 | |
79072805 |
765 | scalar : '$' indirob |
766 | { $$ = newSVREF($2); } |
a687059c |
767 | ; |
768 | |
79072805 |
769 | ary : '@' indirob |
770 | { $$ = newAVREF($2); } |
771 | ; |
772 | |
773 | hsh : '%' indirob |
774 | { $$ = newHVREF($2); } |
775 | ; |
776 | |
777 | arylen : DOLSHARP indirob |
778 | { $$ = newAVREF($2); } |
779 | ; |
780 | |
781 | star : '*' indirob |
a0d0e21e |
782 | { $$ = newGVREF(0,$2); } |
79072805 |
783 | ; |
784 | |
891be019 |
785 | /* Indirect objects */ |
79072805 |
786 | indirob : WORD |
787 | { $$ = scalar($1); } |
fad39ff1 |
788 | | scalar %prec PREC_LOW |
463ee0b2 |
789 | { $$ = scalar($1); } |
79072805 |
790 | | block |
a0d0e21e |
791 | { $$ = scope($1); } |
79072805 |
792 | |
93a17b20 |
793 | | PRIVATEREF |
794 | { $$ = $1; } |
8d063cd8 |
795 | ; |