x2p/a2p.y

   1 %{
   2 /* $RCSfile: a2p.y,v $$Revision: 4.1 $$Date: 92/08/07 18:29:12 $
   3  *
   4  *    Copyright (c) 1991-2001, Larry Wall
   5  *
   6  *    You may distribute under the terms of either the GNU General Public
   7  *    License or the Artistic License, as specified in the README file.
   8  *
   9  * $Log:        a2p.y,v $
  10  */
  11
  12 #include "INTERN.h"
  13 #include "a2p.h"
  14
  15 int root;
  16 int begins = Nullop;
  17 int ends = Nullop;
  18
  19 %}
  20 %token BEGIN END
  21 %token REGEX
  22 %token SEMINEW NEWLINE COMMENT
  23 %token FUN1 FUNN GRGR
  24 %token PRINT PRINTF SPRINTF_OLD SPRINTF_NEW SPLIT
  25 %token IF ELSE WHILE FOR IN
  26 %token EXIT NEXT BREAK CONTINUE RET
  27 %token GETLINE DO SUB GSUB MATCH
  28 %token FUNCTION USERFUN DELETE
  29
  30 %right ASGNOP
  31 %right '?' ':'
  32 %left OROR
  33 %left ANDAND
  34 %left IN
  35 %left NUMBER VAR SUBSTR INDEX
  36 %left MATCHOP
  37 %left RELOP '<' '>'
  38 %left OR
  39 %left STRING
  40 %left '+' '-'
  41 %left '*' '/' '%'
  42 %right UMINUS
  43 %left NOT
  44 %right '^'
  45 %left INCR DECR
  46 %left FIELD VFIELD
  47
  48 %%
  49
  50 program : junk hunks
  51                 { root = oper4(OPROG,$1,begins,$2,ends); }
  52         ;
  53
  54 begin   : BEGIN '{' maybe states '}' junk
  55                 { begins = oper4(OJUNK,begins,$3,$4,$6); in_begin = FALSE;
  56                     $$ = Nullop; }
  57         ;
  58
  59 end     : END '{' maybe states '}'
  60                 { ends = oper3(OJUNK,ends,$3,$4); $$ = Nullop; }
  61         | end NEWLINE
  62                 { $$ = $1; }
  63         ;
  64
  65 hunks   : hunks hunk junk
  66                 { $$ = oper3(OHUNKS,$1,$2,$3); }
  67         | /* NULL */
  68                 { $$ = Nullop; }
  69         ;
  70
  71 hunk    : patpat
  72                 { $$ = oper1(OHUNK,$1); need_entire = TRUE; }
  73         | patpat '{' maybe states '}'
  74                 { $$ = oper2(OHUNK,$1,oper2(OJUNK,$3,$4)); }
  75         | FUNCTION USERFUN '(' arg_list ')' maybe '{' maybe states '}'
  76                 { fixfargs($2,$4,0); $$ = oper5(OUSERDEF,$2,$4,$6,$8,$9); }
  77         | '{' maybe states '}'
  78                 { $$ = oper2(OHUNK,Nullop,oper2(OJUNK,$2,$3)); }
  79         | begin
  80         | end
  81         ;
  82
  83 arg_list: expr_list
  84                 { $$ = rememberargs($$); }
  85         ;
  86
  87 patpat  : cond
  88                 { $$ = oper1(OPAT,$1); }
  89         | cond ',' cond
  90                 { $$ = oper2(ORANGE,$1,$3); }
  91         ;
  92
  93 cond    : expr
  94         | match
  95         | rel
  96         | compound_cond
  97         | cond '?' expr ':' expr
  98                 { $$ = oper3(OCOND,$1,$3,$5); }
  99         ;
 100
 101 compound_cond
 102         : '(' compound_cond ')'
 103                 { $$ = oper1(OCPAREN,$2); }
 104         | cond ANDAND maybe cond
 105                 { $$ = oper3(OCANDAND,$1,$3,$4); }
 106         | cond OROR maybe cond
 107                 { $$ = oper3(OCOROR,$1,$3,$4); }
 108         | NOT cond
 109                 { $$ = oper1(OCNOT,$2); }
 110         ;
 111
 112 rel     : expr RELOP expr
 113                 { $$ = oper3(ORELOP,$2,$1,$3); }
 114         | expr '>' expr
 115                 { $$ = oper3(ORELOP,string(">",1),$1,$3); }
 116         | expr '<' expr
 117                 { $$ = oper3(ORELOP,string("<",1),$1,$3); }
 118         | '(' rel ')'
 119                 { $$ = oper1(ORPAREN,$2); }
 120         ;
 121
 122 match   : expr MATCHOP expr
 123                 { $$ = oper3(OMATCHOP,$2,$1,$3); }
 124         | expr MATCHOP REGEX
 125                 { $$ = oper3(OMATCHOP,$2,$1,oper1(OREGEX,$3)); }
 126         | REGEX         %prec MATCHOP
 127                 { $$ = oper1(OREGEX,$1); }
 128         | '(' match ')'
 129                 { $$ = oper1(OMPAREN,$2); }
 130         ;
 131
 132 expr    : term
 133                 { $$ = $1; }
 134         | expr term
 135                 { $$ = oper2(OCONCAT,$1,$2); }
 136         | expr '?' expr ':' expr
 137                 { $$ = oper3(OCOND,$1,$3,$5); }
 138         | variable ASGNOP cond
 139                 { $$ = oper3(OASSIGN,$2,$1,$3);
 140                         if ((ops[$1].ival & 255) == OFLD)
 141                             lval_field = TRUE;
 142                         if ((ops[$1].ival & 255) == OVFLD)
 143                             lval_field = TRUE;
 144                 }
 145         ;
 146
 147 sprintf : SPRINTF_NEW
 148         | SPRINTF_OLD ;
 149
 150 term    : variable
 151                 { $$ = $1; }
 152         | NUMBER
 153                 { $$ = oper1(ONUM,$1); }
 154         | STRING
 155                 { $$ = oper1(OSTR,$1); }
 156         | term '+' term
 157                 { $$ = oper2(OADD,$1,$3); }
 158         | term '-' term
 159                 { $$ = oper2(OSUBTRACT,$1,$3); }
 160         | term '*' term
 161                 { $$ = oper2(OMULT,$1,$3); }
 162         | term '/' term
 163                 { $$ = oper2(ODIV,$1,$3); }
 164         | term '%' term
 165                 { $$ = oper2(OMOD,$1,$3); }
 166         | term '^' term
 167                 { $$ = oper2(OPOW,$1,$3); }
 168         | term IN VAR
 169                 { $$ = oper2(ODEFINED,aryrefarg($3),$1); }
 170         | variable INCR
 171                 { $$ = oper1(OPOSTINCR,$1); }
 172         | variable DECR
 173                 { $$ = oper1(OPOSTDECR,$1); }
 174         | INCR variable
 175                 { $$ = oper1(OPREINCR,$2); }
 176         | DECR variable
 177                 { $$ = oper1(OPREDECR,$2); }
 178         | '-' term %prec UMINUS
 179                 { $$ = oper1(OUMINUS,$2); }
 180         | '+' term %prec UMINUS
 181                 { $$ = oper1(OUPLUS,$2); }
 182         | '(' cond ')'
 183                 { $$ = oper1(OPAREN,$2); }
 184         | GETLINE
 185                 { $$ = oper0(OGETLINE); }
 186         | GETLINE variable
 187                 { $$ = oper1(OGETLINE,$2); }
 188         | GETLINE '<' expr
 189                 { $$ = oper3(OGETLINE,Nullop,string("<",1),$3);
 190                     if (ops[$3].ival != OSTR + (1<<8)) do_fancy_opens = TRUE; }
 191         | GETLINE variable '<' expr
 192                 { $$ = oper3(OGETLINE,$2,string("<",1),$4);
 193                     if (ops[$4].ival != OSTR + (1<<8)) do_fancy_opens = TRUE; }
 194         | term 'p' GETLINE
 195                 { $$ = oper3(OGETLINE,Nullop,string("|",1),$1);
 196                     if (ops[$1].ival != OSTR + (1<<8)) do_fancy_opens = TRUE; }
 197         | term 'p' GETLINE variable
 198                 { $$ = oper3(OGETLINE,$4,string("|",1),$1);
 199                     if (ops[$1].ival != OSTR + (1<<8)) do_fancy_opens = TRUE; }
 200         | FUN1
 201                 { $$ = oper0($1); need_entire = do_chop = TRUE; }
 202         | FUN1 '(' ')'
 203                 { $$ = oper1($1,Nullop); need_entire = do_chop = TRUE; }
 204         | FUN1 '(' expr ')'
 205                 { $$ = oper1($1,$3); }
 206         | FUNN '(' expr_list ')'
 207                 { $$ = oper1($1,$3); }
 208         | USERFUN '(' expr_list ')'
 209                 { $$ = oper2(OUSERFUN,$1,$3); }
 210         | SPRINTF_NEW '(' expr_list ')'
 211                 { $$ = oper1(OSPRINTF,$3); }
 212         | sprintf expr_list
 213                 { $$ = oper1(OSPRINTF,$2); }
 214         | SUBSTR '(' expr ',' expr ',' expr ')'
 215                 { $$ = oper3(OSUBSTR,$3,$5,$7); }
 216         | SUBSTR '(' expr ',' expr ')'
 217                 { $$ = oper2(OSUBSTR,$3,$5); }
 218         | SPLIT '(' expr ',' VAR ',' expr ')'
 219                 { $$ = oper3(OSPLIT,$3,aryrefarg(numary($5)),$7); }
 220         | SPLIT '(' expr ',' VAR ',' REGEX ')'
 221                 { $$ = oper3(OSPLIT,$3,aryrefarg(numary($5)),oper1(OREGEX,$7));}
 222         | SPLIT '(' expr ',' VAR ')'
 223                 { $$ = oper2(OSPLIT,$3,aryrefarg(numary($5))); }
 224         | INDEX '(' expr ',' expr ')'
 225                 { $$ = oper2(OINDEX,$3,$5); }
 226         | MATCH '(' expr ',' REGEX ')'
 227                 { $$ = oper2(OMATCH,$3,oper1(OREGEX,$5)); }
 228         | MATCH '(' expr ',' expr ')'
 229                 { $$ = oper2(OMATCH,$3,$5); }
 230         | SUB '(' expr ',' expr ')'
 231                 { $$ = oper2(OSUB,$3,$5); }
 232         | SUB '(' REGEX ',' expr ')'
 233                 { $$ = oper2(OSUB,oper1(OREGEX,$3),$5); }
 234         | GSUB '(' expr ',' expr ')'
 235                 { $$ = oper2(OGSUB,$3,$5); }
 236         | GSUB '(' REGEX ',' expr ')'
 237                 { $$ = oper2(OGSUB,oper1(OREGEX,$3),$5); }
 238         | SUB '(' expr ',' expr ',' expr ')'
 239                 { $$ = oper3(OSUB,$3,$5,$7); }
 240         | SUB '(' REGEX ',' expr ',' expr ')'
 241                 { $$ = oper3(OSUB,oper1(OREGEX,$3),$5,$7); }
 242         | GSUB '(' expr ',' expr ',' expr ')'
 243                 { $$ = oper3(OGSUB,$3,$5,$7); }
 244         | GSUB '(' REGEX ',' expr ',' expr ')'
 245                 { $$ = oper3(OGSUB,oper1(OREGEX,$3),$5,$7); }
 246         ;
 247
 248 variable: VAR
 249                 { $$ = oper1(OVAR,$1); }
 250         | VAR '[' expr_list ']'
 251                 { $$ = oper2(OVAR,aryrefarg($1),$3); }
 252         | FIELD
 253                 { $$ = oper1(OFLD,$1); }
 254         | VFIELD term
 255                 { $$ = oper1(OVFLD,$2); }
 256         ;
 257
 258 expr_list
 259         : expr
 260         | clist
 261         | /* NULL */
 262                 { $$ = Nullop; }
 263         ;
 264
 265 clist   : expr ',' maybe expr
 266                 { $$ = oper3(OCOMMA,$1,$3,$4); }
 267         | clist ',' maybe expr
 268                 { $$ = oper3(OCOMMA,$1,$3,$4); }
 269         | '(' clist ')'         /* these parens are invisible */
 270                 { $$ = $2; }
 271         ;
 272
 273 junk    : junk hunksep
 274                 { $$ = oper2(OJUNK,$1,$2); }
 275         | /* NULL */
 276                 { $$ = Nullop; }
 277         ;
 278
 279 hunksep : ';'
 280                 { $$ = oper2(OJUNK,oper0(OSEMICOLON),oper0(ONEWLINE)); }
 281         | SEMINEW
 282                 { $$ = oper2(OJUNK,oper0(OSEMICOLON),oper0(ONEWLINE)); }
 283         | NEWLINE
 284                 { $$ = oper0(ONEWLINE); }
 285         | COMMENT
 286                 { $$ = oper1(OCOMMENT,$1); }
 287         ;
 288
 289 maybe   : maybe nlstuff
 290                 { $$ = oper2(OJUNK,$1,$2); }
 291         | /* NULL */
 292                 { $$ = Nullop; }
 293         ;
 294
 295 nlstuff : NEWLINE
 296                 { $$ = oper0(ONEWLINE); }
 297         | COMMENT
 298                 { $$ = oper1(OCOMMENT,$1); }
 299         ;
 300
 301 separator
 302         : ';' maybe
 303                 { $$ = oper2(OJUNK,oper0(OSEMICOLON),$2); }
 304         | SEMINEW maybe
 305                 { $$ = oper2(OJUNK,oper0(OSNEWLINE),$2); }
 306         | NEWLINE maybe
 307                 { $$ = oper2(OJUNK,oper0(OSNEWLINE),$2); }
 308         | COMMENT maybe
 309                 { $$ = oper2(OJUNK,oper1(OSCOMMENT,$1),$2); }
 310         ;
 311
 312 states  : states statement
 313                 { $$ = oper2(OSTATES,$1,$2); }
 314         | /* NULL */
 315                 { $$ = Nullop; }
 316         ;
 317
 318 statement
 319         : simple separator maybe
 320                 { $$ = oper2(OJUNK,oper2(OSTATE,$1,$2),$3); }
 321         | ';' maybe
 322                 { $$ = oper2(OSTATE,Nullop,oper2(OJUNK,oper0(OSEMICOLON),$2)); }
 323         | SEMINEW maybe
 324                 { $$ = oper2(OSTATE,Nullop,oper2(OJUNK,oper0(OSNEWLINE),$2)); }
 325         | compound
 326         ;
 327
 328 simpnull: simple
 329         | /* NULL */
 330                 { $$ = Nullop; }
 331         ;
 332
 333 simple
 334         : expr
 335         | PRINT expr_list redir expr
 336                 { $$ = oper3(OPRINT,$2,$3,$4);
 337                     do_opens = TRUE;
 338                     saw_ORS = saw_OFS = TRUE;
 339                     if (!$2) need_entire = TRUE;
 340                     if (ops[$4].ival != OSTR + (1<<8)) do_fancy_opens = TRUE; }
 341         | PRINT expr_list
 342                 { $$ = oper1(OPRINT,$2);
 343                     if (!$2) need_entire = TRUE;
 344                     saw_ORS = saw_OFS = TRUE;
 345                 }
 346         | PRINTF expr_list redir expr
 347                 { $$ = oper3(OPRINTF,$2,$3,$4);
 348                     do_opens = TRUE;
 349                     if (!$2) need_entire = TRUE;
 350                     if (ops[$4].ival != OSTR + (1<<8)) do_fancy_opens = TRUE; }
 351         | PRINTF expr_list
 352                 { $$ = oper1(OPRINTF,$2);
 353                     if (!$2) need_entire = TRUE;
 354                 }
 355         | BREAK
 356                 { $$ = oper0(OBREAK); }
 357         | NEXT
 358                 { $$ = oper0(ONEXT); }
 359         | EXIT
 360                 { $$ = oper0(OEXIT); }
 361         | EXIT expr
 362                 { $$ = oper1(OEXIT,$2); }
 363         | CONTINUE
 364                 { $$ = oper0(OCONTINUE); }
 365         | RET
 366                 { $$ = oper0(ORETURN); }
 367         | RET expr
 368                 { $$ = oper1(ORETURN,$2); }
 369         | DELETE VAR '[' expr_list ']'
 370                 { $$ = oper2(ODELETE,aryrefarg($2),$4); }
 371         ;
 372
 373 redir   : '>'   %prec FIELD
 374                 { $$ = oper1(OREDIR,string(">",1)); }
 375         | GRGR
 376                 { $$ = oper1(OREDIR,string(">>",2)); }
 377         | '|'
 378                 { $$ = oper1(OREDIR,string("|",1)); }
 379         ;
 380
 381 compound
 382         : IF '(' cond ')' maybe statement
 383                 { $$ = oper2(OIF,$3,bl($6,$5)); }
 384         | IF '(' cond ')' maybe statement ELSE maybe statement
 385                 { $$ = oper3(OIF,$3,bl($6,$5),bl($9,$8)); }
 386         | WHILE '(' cond ')' maybe statement
 387                 { $$ = oper2(OWHILE,$3,bl($6,$5)); }
 388         | DO maybe statement WHILE '(' cond ')'
 389                 { $$ = oper2(ODO,bl($3,$2),$6); }
 390         | FOR '(' simpnull ';' cond ';' simpnull ')' maybe statement
 391                 { $$ = oper4(OFOR,$3,$5,$7,bl($10,$9)); }
 392         | FOR '(' simpnull ';'  ';' simpnull ')' maybe statement
 393                 { $$ = oper4(OFOR,$3,string("",0),$6,bl($9,$8)); }
 394         | FOR '(' expr ')' maybe statement
 395                 { $$ = oper2(OFORIN,$3,bl($6,$5)); }
 396         | '{' maybe states '}' maybe
 397                 { $$ = oper3(OBLOCK,oper2(OJUNK,$2,$3),Nullop,$5); }
 398         ;
 399
 400 %%
 401
 402 int yyparse (void);
 403
 404 #include "a2py.c"