1 /**************************************************************** 2 Copyright (C) Lucent Technologies 1997 3 All Rights Reserved 4 5 Permission to use, copy, modify, and distribute this software and 6 its documentation for any purpose and without fee is hereby 7 granted, provided that the above copyright notice appear in all 8 copies and that both that the copyright notice and this 9 permission notice and warranty disclaimer appear in supporting 10 documentation, and that the name Lucent Technologies or any of 11 its entities not be used in advertising or publicity pertaining 12 to distribution of the software without specific, written prior 13 permission. 14 15 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 16 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 17 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 18 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 20 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 21 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 22 THIS SOFTWARE. 23 ****************************************************************/ 24 25 %{ 26 #include <stdio.h> 27 #include <string.h> 28 #include "awk.h" 29 30 void checkdup(Node *list, Cell *item); 31 int yywrap(void) { return(1); } 32 33 Node *beginloc = 0; 34 Node *endloc = 0; 35 bool infunc = false; /* = true if in arglist or body of func */ 36 int inloop = 0; /* >= 1 if in while, for, do; can't be bool, since loops can next */ 37 char *curfname = 0; /* current function name */ 38 Node *arglist = 0; /* list of args for current function */ 39 %} 40 41 %union { 42 Node *p; 43 Cell *cp; 44 int i; 45 char *s; 46 } 47 48 %token <i> FIRSTTOKEN /* must be first */ 49 %token <p> PROGRAM PASTAT PASTAT2 XBEGIN XEND 50 %token <i> NL ',' '{' '(' '|' ';' '/' ')' '}' '[' ']' 51 %token <i> ARRAY 52 %token <i> MATCH NOTMATCH MATCHOP 53 %token <i> FINAL DOT ALL CCL NCCL CHAR OR STAR QUEST PLUS EMPTYRE ZERO 54 %token <i> AND BOR APPEND EQ GE GT LE LT NE IN 55 %token <i> ARG BLTIN BREAK CLOSE CONTINUE DELETE DO EXIT FOR FUNC 56 %token <i> SUB GSUB IF INDEX LSUBSTR MATCHFCN NEXT NEXTFILE 57 %token <i> ADD MINUS MULT DIVIDE MOD 58 %token <i> ASSIGN ASGNOP ADDEQ SUBEQ MULTEQ DIVEQ MODEQ POWEQ 59 %token <i> PRINT PRINTF SPRINTF 60 %token <p> ELSE INTEST CONDEXPR 61 %token <i> POSTINCR PREINCR POSTDECR PREDECR 62 %token <cp> VAR IVAR VARNF CALL NUMBER STRING 63 %token <s> REGEXPR 64 65 %type <p> pas pattern ppattern plist pplist patlist prarg term re 66 %type <p> pa_pat pa_stat pa_stats 67 %type <s> reg_expr 68 %type <p> simple_stmt opt_simple_stmt stmt stmtlist 69 %type <p> var varname funcname varlist 70 %type <p> for if else while 71 %type <i> do st 72 %type <i> pst opt_pst lbrace rbrace rparen comma nl opt_nl and bor 73 %type <i> subop print 74 %type <cp> string 75 76 %right ASGNOP 77 %right '?' 78 %right ':' 79 %left BOR 80 %left AND 81 %left GETLINE 82 %nonassoc APPEND EQ GE GT LE LT NE MATCHOP IN '|' 83 %left ARG BLTIN BREAK CALL CLOSE CONTINUE DELETE DO EXIT FOR FUNC 84 %left GSUB IF INDEX LSUBSTR MATCHFCN NEXT NUMBER 85 %left PRINT PRINTF RETURN SPLIT SPRINTF STRING SUB SUBSTR 86 %left REGEXPR VAR VARNF IVAR WHILE '(' 87 %left CAT 88 %left '+' '-' 89 %left '*' '/' '%' 90 %left NOT UMINUS UPLUS 91 %right POWER 92 %right DECR INCR 93 %left INDIRECT 94 %token LASTTOKEN /* must be last */ 95 96 %% 97 98 program: 99 pas { if (errorflag==0) 100 winner = (Node *)stat3(PROGRAM, beginloc, $1, endloc); } 101 | error { yyclearin; bracecheck(); SYNTAX("bailing out"); } 102 ; 103 104 and: 105 AND | and NL 106 ; 107 108 bor: 109 BOR | bor NL 110 ; 111 112 comma: 113 ',' | comma NL 114 ; 115 116 do: 117 DO | do NL 118 ; 119 120 else: 121 ELSE | else NL 122 ; 123 124 for: 125 FOR '(' opt_simple_stmt ';' opt_nl pattern ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt 126 { --inloop; $$ = stat4(FOR, $3, notnull($6), $9, $12); } 127 | FOR '(' opt_simple_stmt ';' ';' opt_nl opt_simple_stmt rparen {inloop++;} stmt 128 { --inloop; $$ = stat4(FOR, $3, NIL, $7, $10); } 129 | FOR '(' varname IN varname rparen {inloop++;} stmt 130 { --inloop; $$ = stat3(IN, $3, makearr($5), $8); } 131 ; 132 133 funcname: 134 VAR { setfname($1); } 135 | CALL { setfname($1); } 136 ; 137 138 if: 139 IF '(' pattern rparen { $$ = notnull($3); } 140 ; 141 142 lbrace: 143 '{' | lbrace NL 144 ; 145 146 nl: 147 NL | nl NL 148 ; 149 150 opt_nl: 151 /* empty */ { $$ = 0; } 152 | nl 153 ; 154 155 opt_pst: 156 /* empty */ { $$ = 0; } 157 | pst 158 ; 159 160 161 opt_simple_stmt: 162 /* empty */ { $$ = 0; } 163 | simple_stmt 164 ; 165 166 pas: 167 opt_pst { $$ = 0; } 168 | opt_pst pa_stats opt_pst { $$ = $2; } 169 ; 170 171 pa_pat: 172 pattern { $$ = notnull($1); } 173 ; 174 175 pa_stat: 176 pa_pat { $$ = stat2(PASTAT, $1, stat2(PRINT, rectonode(), NIL)); } 177 | pa_pat lbrace stmtlist '}' { $$ = stat2(PASTAT, $1, $3); } 178 | pa_pat ',' opt_nl pa_pat { $$ = pa2stat($1, $4, stat2(PRINT, rectonode(), NIL)); } 179 | pa_pat ',' opt_nl pa_pat lbrace stmtlist '}' { $$ = pa2stat($1, $4, $6); } 180 | lbrace stmtlist '}' { $$ = stat2(PASTAT, NIL, $2); } 181 | XBEGIN lbrace stmtlist '}' 182 { beginloc = linkum(beginloc, $3); $$ = 0; } 183 | XEND lbrace stmtlist '}' 184 { endloc = linkum(endloc, $3); $$ = 0; } 185 | FUNC funcname '(' varlist rparen {infunc = true;} lbrace stmtlist '}' 186 { infunc = false; curfname=0; defn((Cell *)$2, $4, $8); $$ = 0; } 187 ; 188 189 pa_stats: 190 pa_stat 191 | pa_stats opt_pst pa_stat { $$ = linkum($1, $3); } 192 ; 193 194 patlist: 195 pattern 196 | patlist comma pattern { $$ = linkum($1, $3); } 197 ; 198 199 ppattern: 200 var ASGNOP ppattern { $$ = op2($2, $1, $3); } 201 | ppattern '?' ppattern ':' ppattern %prec '?' 202 { $$ = op3(CONDEXPR, notnull($1), $3, $5); } 203 | ppattern bor ppattern %prec BOR 204 { $$ = op2(BOR, notnull($1), notnull($3)); } 205 | ppattern and ppattern %prec AND 206 { $$ = op2(AND, notnull($1), notnull($3)); } 207 | ppattern MATCHOP reg_expr { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); free($3); } 208 | ppattern MATCHOP ppattern 209 { if (constnode($3)) { 210 $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0)); 211 free($3); 212 } else 213 $$ = op3($2, (Node *)1, $1, $3); } 214 | ppattern IN varname { $$ = op2(INTEST, $1, makearr($3)); } 215 | '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); } 216 | ppattern term %prec CAT { $$ = op2(CAT, $1, $2); } 217 | re 218 | term 219 ; 220 221 pattern: 222 var ASGNOP pattern { $$ = op2($2, $1, $3); } 223 | pattern '?' pattern ':' pattern %prec '?' 224 { $$ = op3(CONDEXPR, notnull($1), $3, $5); } 225 | pattern bor pattern %prec BOR 226 { $$ = op2(BOR, notnull($1), notnull($3)); } 227 | pattern and pattern %prec AND 228 { $$ = op2(AND, notnull($1), notnull($3)); } 229 | pattern EQ pattern { $$ = op2($2, $1, $3); } 230 | pattern GE pattern { $$ = op2($2, $1, $3); } 231 | pattern GT pattern { $$ = op2($2, $1, $3); } 232 | pattern LE pattern { $$ = op2($2, $1, $3); } 233 | pattern LT pattern { $$ = op2($2, $1, $3); } 234 | pattern NE pattern { $$ = op2($2, $1, $3); } 235 | pattern MATCHOP reg_expr { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); free($3); } 236 | pattern MATCHOP pattern 237 { if (constnode($3)) { 238 $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0)); 239 free($3); 240 } else 241 $$ = op3($2, (Node *)1, $1, $3); } 242 | pattern IN varname { $$ = op2(INTEST, $1, makearr($3)); } 243 | '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); } 244 | pattern '|' GETLINE var { 245 if (safe) SYNTAX("cmd | getline is unsafe"); 246 else $$ = op3(GETLINE, $4, itonp($2), $1); } 247 | pattern '|' GETLINE { 248 if (safe) SYNTAX("cmd | getline is unsafe"); 249 else $$ = op3(GETLINE, (Node*)0, itonp($2), $1); } 250 | pattern term %prec CAT { $$ = op2(CAT, $1, $2); } 251 | re 252 | term 253 ; 254 255 plist: 256 pattern comma pattern { $$ = linkum($1, $3); } 257 | plist comma pattern { $$ = linkum($1, $3); } 258 ; 259 260 pplist: 261 ppattern 262 | pplist comma ppattern { $$ = linkum($1, $3); } 263 ; 264 265 prarg: 266 /* empty */ { $$ = rectonode(); } 267 | pplist 268 | '(' plist ')' { $$ = $2; } 269 ; 270 271 print: 272 PRINT | PRINTF 273 ; 274 275 pst: 276 NL | ';' | pst NL | pst ';' 277 ; 278 279 rbrace: 280 '}' | rbrace NL 281 ; 282 283 re: 284 reg_expr 285 { $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); free($1); } 286 | NOT re { $$ = op1(NOT, notnull($2)); } 287 ; 288 289 reg_expr: 290 '/' {startreg();} REGEXPR '/' { $$ = $3; } 291 ; 292 293 rparen: 294 ')' | rparen NL 295 ; 296 297 simple_stmt: 298 print prarg '|' term { 299 if (safe) SYNTAX("print | is unsafe"); 300 else $$ = stat3($1, $2, itonp($3), $4); } 301 | print prarg APPEND term { 302 if (safe) SYNTAX("print >> is unsafe"); 303 else $$ = stat3($1, $2, itonp($3), $4); } 304 | print prarg GT term { 305 if (safe) SYNTAX("print > is unsafe"); 306 else $$ = stat3($1, $2, itonp($3), $4); } 307 | print prarg { $$ = stat3($1, $2, NIL, NIL); } 308 | DELETE varname '[' patlist ']' { $$ = stat2(DELETE, makearr($2), $4); } 309 | DELETE varname { $$ = stat2(DELETE, makearr($2), 0); } 310 | pattern { $$ = exptostat($1); } 311 | error { yyclearin; SYNTAX("illegal statement"); } 312 ; 313 314 st: 315 nl 316 | ';' opt_nl 317 ; 318 319 stmt: 320 BREAK st { if (!inloop) SYNTAX("break illegal outside of loops"); 321 $$ = stat1(BREAK, NIL); } 322 | CONTINUE st { if (!inloop) SYNTAX("continue illegal outside of loops"); 323 $$ = stat1(CONTINUE, NIL); } 324 | do {inloop++;} stmt {--inloop;} WHILE '(' pattern ')' st 325 { $$ = stat2(DO, $3, notnull($7)); } 326 | EXIT pattern st { $$ = stat1(EXIT, $2); } 327 | EXIT st { $$ = stat1(EXIT, NIL); } 328 | for 329 | if stmt else stmt { $$ = stat3(IF, $1, $2, $4); } 330 | if stmt { $$ = stat3(IF, $1, $2, NIL); } 331 | lbrace stmtlist rbrace { $$ = $2; } 332 | NEXT st { if (infunc) 333 SYNTAX("next is illegal inside a function"); 334 $$ = stat1(NEXT, NIL); } 335 | NEXTFILE st { if (infunc) 336 SYNTAX("nextfile is illegal inside a function"); 337 $$ = stat1(NEXTFILE, NIL); } 338 | RETURN pattern st { $$ = stat1(RETURN, $2); } 339 | RETURN st { $$ = stat1(RETURN, NIL); } 340 | simple_stmt st 341 | while {inloop++;} stmt { --inloop; $$ = stat2(WHILE, $1, $3); } 342 | ';' opt_nl { $$ = 0; } 343 ; 344 345 stmtlist: 346 stmt 347 | stmtlist stmt { $$ = linkum($1, $2); } 348 ; 349 350 subop: 351 SUB | GSUB 352 ; 353 354 string: 355 STRING 356 | string STRING { $$ = catstr($1, $2); } 357 ; 358 359 term: 360 term '/' ASGNOP term { $$ = op2(DIVEQ, $1, $4); } 361 | term '+' term { $$ = op2(ADD, $1, $3); } 362 | term '-' term { $$ = op2(MINUS, $1, $3); } 363 | term '*' term { $$ = op2(MULT, $1, $3); } 364 | term '/' term { $$ = op2(DIVIDE, $1, $3); } 365 | term '%' term { $$ = op2(MOD, $1, $3); } 366 | term POWER term { $$ = op2(POWER, $1, $3); } 367 | '-' term %prec UMINUS { $$ = op1(UMINUS, $2); } 368 | '+' term %prec UMINUS { $$ = op1(UPLUS, $2); } 369 | NOT term %prec UMINUS { $$ = op1(NOT, notnull($2)); } 370 | BLTIN '(' ')' { $$ = op2(BLTIN, itonp($1), rectonode()); } 371 | BLTIN '(' patlist ')' { $$ = op2(BLTIN, itonp($1), $3); } 372 | BLTIN { $$ = op2(BLTIN, itonp($1), rectonode()); } 373 | CALL '(' ')' { $$ = op2(CALL, celltonode($1,CVAR), NIL); } 374 | CALL '(' patlist ')' { $$ = op2(CALL, celltonode($1,CVAR), $3); } 375 | CLOSE term { $$ = op1(CLOSE, $2); } 376 | DECR var { $$ = op1(PREDECR, $2); } 377 | INCR var { $$ = op1(PREINCR, $2); } 378 | var DECR { $$ = op1(POSTDECR, $1); } 379 | var INCR { $$ = op1(POSTINCR, $1); } 380 | GETLINE var LT term { $$ = op3(GETLINE, $2, itonp($3), $4); } 381 | GETLINE LT term { $$ = op3(GETLINE, NIL, itonp($2), $3); } 382 | GETLINE var { $$ = op3(GETLINE, $2, NIL, NIL); } 383 | GETLINE { $$ = op3(GETLINE, NIL, NIL, NIL); } 384 | INDEX '(' pattern comma pattern ')' 385 { $$ = op2(INDEX, $3, $5); } 386 | INDEX '(' pattern comma reg_expr ')' 387 { SYNTAX("index() doesn't permit regular expressions"); 388 $$ = op2(INDEX, $3, (Node*)$5); } 389 | '(' pattern ')' { $$ = $2; } 390 | MATCHFCN '(' pattern comma reg_expr ')' 391 { $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa($5, 1)); free($5); } 392 | MATCHFCN '(' pattern comma pattern ')' 393 { if (constnode($5)) { 394 $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1)); 395 free($5); 396 } else 397 $$ = op3(MATCHFCN, (Node *)1, $3, $5); } 398 | NUMBER { $$ = celltonode($1, CCON); } 399 | SPLIT '(' pattern comma varname comma pattern ')' /* string */ 400 { $$ = op4(SPLIT, $3, makearr($5), $7, (Node*)STRING); } 401 | SPLIT '(' pattern comma varname comma reg_expr ')' /* const /regexp/ */ 402 { $$ = op4(SPLIT, $3, makearr($5), (Node*)makedfa($7, 1), (Node *)REGEXPR); free($7); } 403 | SPLIT '(' pattern comma varname ')' 404 { $$ = op4(SPLIT, $3, makearr($5), NIL, (Node*)STRING); } /* default */ 405 | SPRINTF '(' patlist ')' { $$ = op1($1, $3); } 406 | string { $$ = celltonode($1, CCON); } 407 | subop '(' reg_expr comma pattern ')' 408 { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); free($3); } 409 | subop '(' pattern comma pattern ')' 410 { if (constnode($3)) { 411 $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode()); 412 free($3); 413 } else 414 $$ = op4($1, (Node *)1, $3, $5, rectonode()); } 415 | subop '(' reg_expr comma pattern comma var ')' 416 { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, $7); free($3); } 417 | subop '(' pattern comma pattern comma var ')' 418 { if (constnode($3)) { 419 $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7); 420 free($3); 421 } else 422 $$ = op4($1, (Node *)1, $3, $5, $7); } 423 | SUBSTR '(' pattern comma pattern comma pattern ')' 424 { $$ = op3(SUBSTR, $3, $5, $7); } 425 | SUBSTR '(' pattern comma pattern ')' 426 { $$ = op3(SUBSTR, $3, $5, NIL); } 427 | var 428 ; 429 430 var: 431 varname 432 | varname '[' patlist ']' { $$ = op2(ARRAY, makearr($1), $3); } 433 | IVAR { $$ = op1(INDIRECT, celltonode($1, CVAR)); } 434 | INDIRECT term { $$ = op1(INDIRECT, $2); } 435 ; 436 437 varlist: 438 /* nothing */ { arglist = $$ = 0; } 439 | VAR { arglist = $$ = celltonode($1,CVAR); } 440 | varlist comma VAR { 441 checkdup($1, $3); 442 arglist = $$ = linkum($1,celltonode($3,CVAR)); } 443 ; 444 445 varname: 446 VAR { $$ = celltonode($1, CVAR); } 447 | ARG { $$ = op1(ARG, itonp($1)); } 448 | VARNF { $$ = op1(VARNF, (Node *) $1); } 449 ; 450 451 452 while: 453 WHILE '(' pattern rparen { $$ = notnull($3); } 454 ; 455 456 %% 457 458 void setfname(Cell *p) 459 { 460 if (isarr(p)) 461 SYNTAX("%s is an array, not a function", p->nval); 462 else if (isfcn(p)) 463 SYNTAX("you can't define function %s more than once", p->nval); 464 curfname = p->nval; 465 } 466 467 int constnode(Node *p) 468 { 469 return isvalue(p) && ((Cell *) (p->narg[0]))->csub == CCON; 470 } 471 472 char *strnode(Node *p) 473 { 474 return ((Cell *)(p->narg[0]))->sval; 475 } 476 477 Node *notnull(Node *n) 478 { 479 switch (n->nobj) { 480 case LE: case LT: case EQ: case NE: case GT: case GE: 481 case BOR: case AND: case NOT: 482 return n; 483 default: 484 return op2(NE, n, nullnode); 485 } 486 } 487 488 void checkdup(Node *vl, Cell *cp) /* check if name already in list */ 489 { 490 char *s = cp->nval; 491 for ( ; vl; vl = vl->nnext) { 492 if (strcmp(s, ((Cell *)(vl->narg[0]))->nval) == 0) { 493 SYNTAX("duplicate argument %s", s); 494 break; 495 } 496 } 497 } 498