lib/action/swf4compiler.y

   1 /* $Id: swf4compiler.y,v 1.1 2004/05/08 17:17:35 kramm Exp $ */
   2
   3 %start program
   4
   5 %{
   6
   7 #include <time.h>
   8 #include <string.h>
   9 #include <stdlib.h>
  10 #include "compile.h"
  11 #include "action.h"
  12
  13 #define YYPARSE_PARAM buffer
  14
  15 %}
  16
  17 %union {
  18   Buffer action;
  19   char *str;
  20   SWFActionFunction function;
  21   SWFGetUrl2Method getURLMethod;
  22 }
  23
  24 /* tokens etc. */
  25 %token BREAK
  26 %token FOR
  27 %token CONTINUE
  28 %token IF
  29 %token ELSE
  30 %token DO
  31 %token WHILE
  32
  33 %token THIS
  34
  35 /* functions */
  36 %token EVAL
  37 %token TIME
  38 %token RANDOM
  39 %token LENGTH
  40 %token INT
  41 %token CONCAT
  42 %token DUPLICATECLIP
  43 %token REMOVECLIP
  44 %token TRACE
  45 %token STARTDRAG
  46 %token STOPDRAG
  47 %token ORD
  48 %token CHR
  49 %token CALLFRAME
  50 %token GETURL
  51 %token GETURL1
  52 %token LOADMOVIE
  53 %token LOADVARIABLES
  54 %token POSTURL
  55 %token SUBSTR
  56
  57 %token GETPROPERTY
  58
  59 /* v3 functions */
  60 %token NEXTFRAME
  61 %token PREVFRAME
  62 %token PLAY
  63 %token STOP
  64 %token TOGGLEQUALITY
  65 %token STOPSOUNDS
  66 %token GOTOFRAME
  67 %token GOTOANDPLAY
  68 %token FRAMELOADED
  69 %token SETTARGET
  70
  71 /* high level functions */
  72 %token TELLTARGET
  73
  74 /* these three are strdup'ed in compiler.flex, so free them here */
  75 %token <str> STRING
  76 %token <str> NUMBER
  77 %token <str> IDENTIFIER
  78 %token <str> PATH
  79
  80 %token <getURLMethod> GETURL_METHOD
  81
  82 %token EQ "=="
  83 %token LE "<="
  84 %token GE ">="
  85 %token NE "!="
  86 %token LAN "&&"
  87 %token LOR "||"
  88 %token INC "++"
  89 %token DEC "--"
  90 %token IEQ "+="
  91 %token DEQ "/="
  92 %token MEQ "*="
  93 %token SEQ "-="
  94 %token STREQ "==="
  95 %token STRNE "!=="
  96 %token STRCMP "<=>"
  97 %token PARENT ".."
  98
  99 %token END "end"
 100
 101 /* ascending order of ops ..? */
 102 %left ','
 103 %right '=' "*=" "/=" "+=" "-="
 104 %right '?' ':'
 105 %left "&&" "||"
 106 %left "==" "!=" "===" "!=="
 107 %left '<' '>' "<=" ">=" "<=>"
 108 %left '&'
 109 %left '+' '-'
 110 %left '*' '/'
 111 %right "++" "--" UMINUS '!'
 112 %right POSTFIX
 113 %right NEGATE
 114
 115 %type <action> elem
 116 %type <action> elems
 117 %type <action> stmt
 118 %type <action> statements
 119 %type <action> if_stmt
 120 %type <action> iter_stmt
 121 %type <action> cont_stmt
 122 %type <action> break_stmt
 123 %type <action> expr_opt
 124 %type <action> void_function_call
 125 %type <action> function_call
 126 %type <action> lhs_expr
 127 %type <action> pf_expr
 128 %type <action> rhs_expr
 129 %type <action> assign_stmt
 130 %type <action> assign_stmts
 131 %type <action> assign_stmts_opt
 132 %type <action> expr
 133 %type <action> program
 134
 135 /* make sure to free these, too! */
 136 %type <str>    sprite
 137 %type <str>    variable
 138
 139 %%
 140
 141 /* rules */
 142
 143 program
 144         : elems
 145                 { *((Buffer *)buffer) = $1; }
 146
 147         ;
 148
 149 elems
 150         : elem
 151         | elems elem
 152                 { bufferConcat($1, $2); }
 153         ;
 154
 155 elem
 156         : stmt
 157         ;
 158
 159 stmt
 160         : '{' '}'                               { $$ = NULL; }
 161         | '{' statements '}'                    { $$ = $2; }
 162         | ';'                                   { $$ = NULL; }
 163         | assign_stmt ';'
 164         | if_stmt
 165         | iter_stmt
 166         | cont_stmt
 167         | break_stmt
 168         ;
 169
 170 assign_stmts
 171         : assign_stmt
 172         | assign_stmts ',' assign_stmt          { bufferConcat($1, $3); }
 173         ;
 174
 175 statements
 176         : /* empty */   { $$ = NULL; }
 177         | stmt
 178         | statements stmt
 179                         { bufferConcat($1, $2); }
 180         ;
 181
 182 if_stmt
 183         /* XXX- I haven't tested the frameloaded() stuff yet.. */
 184
 185         : IF '(' FRAMELOADED '(' NUMBER ')' ')' stmt ELSE stmt
 186                 { $$ = newBuffer();
 187                   bufferWriteU8($$, SWFACTION_WAITFORFRAME);
 188                   bufferWriteS16($$, 3);
 189                   bufferWriteS16($$, atoi($5));
 190                   free($5);
 191                   bufferWriteU8($$, 1);         /* if not loaded, jump to.. */
 192                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 193                   bufferWriteS16($$, 2);
 194                   bufferWriteS16($$, bufferLength($10)+5);
 195                   bufferConcat($$, $10);                          /* ..here */
 196                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 197                   bufferWriteS16($$, 2);
 198                   bufferWriteS16($$, bufferLength($8));
 199                   bufferConcat($$, $8); }
 200
 201         | IF '(' FRAMELOADED '(' NUMBER ')' ')' stmt
 202                 { $$ = newBuffer();
 203                   bufferWriteU8($$, SWFACTION_WAITFORFRAME);
 204                   bufferWriteS16($$, 3);
 205                   bufferWriteS16($$, atoi($5));
 206                   free($5);
 207                   bufferWriteU8($$, 1);         /* if not loaded, jump to.. */
 208                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 209                   bufferWriteS16($$, 2);
 210                   bufferWriteS16($$, 5);
 211                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);      /* ..here */
 212                   bufferWriteS16($$, 2);
 213                   bufferWriteS16($$, bufferLength($8));   /* ..and then out */
 214                   bufferConcat($$, $8); }
 215
 216         /* make this case cleaner.. */
 217         | IF '(' '!' FRAMELOADED '(' NUMBER ')' ')' stmt
 218                 { $$ = newBuffer();
 219                   bufferWriteU8($$, SWFACTION_WAITFORFRAME);
 220                   bufferWriteS16($$, 3);
 221                   bufferWriteS16($$, atoi($6));
 222                   free($6);
 223                   bufferWriteU8($$, 1);         /* if not loaded, jump to.. */
 224                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 225                   bufferWriteS16($$, 2);
 226                   bufferWriteS16($$, bufferLength($9));
 227                   bufferConcat($$, $9); }                         /* ..here */
 228
 229         | IF '(' FRAMELOADED '(' expr ')' ')' stmt ELSE stmt
 230                 { $$ = $5;
 231                   bufferWriteU8($$, SWFACTION_WAITFORFRAMEEXPRESSION);
 232                   bufferWriteS16($$, 1);
 233                   bufferWriteU8($$, 1);         /* if not loaded, jump to.. */
 234                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 235                   bufferWriteS16($$, 2);
 236                   bufferWriteS16($$, bufferLength($10)+5);
 237                   bufferConcat($$, $10);                          /* ..here */
 238                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 239                   bufferWriteS16($$, 2);
 240                   bufferWriteS16($$, bufferLength($8));
 241                   bufferConcat($$, $8); }
 242
 243         | IF '(' FRAMELOADED '(' expr ')' ')' stmt
 244                 { $$ = $5;
 245                   bufferWriteU8($$, SWFACTION_WAITFORFRAMEEXPRESSION);
 246                   bufferWriteS16($$, 1);
 247                   bufferWriteU8($$, 1);         /* if not loaded, jump to.. */
 248                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 249                   bufferWriteS16($$, 2);
 250                   bufferWriteS16($$, 5);
 251                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);      /* ..here */
 252                   bufferWriteS16($$, 2);
 253                   bufferWriteS16($$, bufferLength($8));   /* ..and then out */
 254                   bufferConcat($$, $8); }
 255
 256         /* make this case cleaner.. */
 257         | IF '(' '!' FRAMELOADED '(' expr ')' ')' stmt
 258                 { $$ = $6;
 259                   bufferWriteU8($$, SWFACTION_WAITFORFRAMEEXPRESSION);
 260                   bufferWriteS16($$, 1);
 261                   bufferWriteU8($$, 1);         /* if not loaded, jump to.. */
 262                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 263                   bufferWriteS16($$, 2);
 264                   bufferWriteS16($$, bufferLength($9));
 265                   bufferConcat($$, $9); }                         /* ..here */
 266
 267         | IF '(' expr ')' stmt ELSE stmt
 268                 { bufferWriteU8($3, SWFACTION_BRANCHIFTRUE);
 269                   bufferWriteS16($3, 2);
 270                   bufferWriteS16($3, bufferLength($7)+5);
 271                   bufferConcat($3, $7);
 272                   bufferWriteU8($3, SWFACTION_BRANCHALWAYS);
 273                   bufferWriteS16($3, 2);
 274                   bufferWriteS16($3, bufferLength($5));
 275                   bufferConcat($3, $5);
 276                   $$ = $3; }
 277
 278         | IF '(' expr ')' stmt
 279                 { bufferWriteU8($3, SWFACTION_LOGICALNOT);
 280                   bufferWriteU8($3, SWFACTION_BRANCHIFTRUE);
 281                   bufferWriteS16($3, 2);
 282                   bufferWriteS16($3, bufferLength($5));
 283                   bufferConcat($3, $5);
 284                   $$ = $3; }
 285         ;
 286
 287 expr_opt
 288         : /* empty */   { $$ = NULL; }
 289         | expr          { $$ = $1; }
 290         ;
 291
 292 /* not thought out yet..
 293 switch_stmt
 294         : SWITCH '(' expr ')' '{'
 295                 { $$ = $3;
 296                   pushLoop(); }
 297           switch_cases '}'
 298                 { bufferConcat($$, $7); }
 299         ;
 300
 301 switch_cases
 302         : switch_cases switch_case
 303         | switch_case
 304         ;
 305
 306 switch_case
 307         : CASE INTEGER ':' stmt
 308                 { $$ = newBuffer(); }
 309         ;
 310 */
 311
 312 iter_stmt
 313         : WHILE '(' '!' FRAMELOADED '(' NUMBER ')' ')' stmt
 314                 { $$ = newBuffer();
 315                   bufferWriteU8($$, SWFACTION_WAITFORFRAME);
 316                   bufferWriteS16($$, 3);
 317                   bufferWriteS16($$, atoi($6));
 318                   free($6);
 319                   bufferWriteU8($$, 1);         /* if not loaded, jump to.. */
 320                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 321                   bufferWriteS16($$, 2);
 322                   bufferWriteS16($$, bufferLength($9)+5);
 323                   bufferConcat($$, $9);                           /* ..here */
 324                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 325                   bufferWriteS16($$, 2);
 326                   bufferWriteS16($$, -(bufferLength($$)+2)); }
 327
 328         | WHILE '(' expr ')' stmt
 329                 { $$ = $3;
 330                   bufferWriteU8($$, SWFACTION_LOGICALNOT);
 331                   bufferWriteU8($$, SWFACTION_BRANCHIFTRUE);
 332                   bufferWriteS16($$, 2);
 333                   bufferWriteS16($$, bufferLength($5)+5);
 334                   bufferConcat($$, $5);
 335                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 336                   bufferWriteS16($$, 2);
 337                   bufferWriteS16($$, -(bufferLength($$)+2));
 338                   bufferResolveJumps($$); }
 339
 340         | DO stmt WHILE '(' expr ')'
 341                 { $$ = $2;
 342                   bufferConcat($$, $5);
 343                   bufferWriteU8($$, SWFACTION_BRANCHIFTRUE);
 344                   bufferWriteS16($$, 2);
 345                   bufferWriteS16($$, -(bufferLength($$)+2));
 346                   bufferResolveJumps($$); }
 347
 348         | FOR '(' assign_stmts_opt ';' expr_opt ';' assign_stmts_opt ')' stmt
 349                 { if (!$5)
 350                     $5 = newBuffer();
 351                   else {
 352                     bufferWriteU8($5, SWFACTION_LOGICALNOT);
 353                     bufferWriteU8($5, SWFACTION_BRANCHIFTRUE);
 354                     bufferWriteS16($5, 2);
 355                     bufferWriteS16($5, bufferLength($9)+bufferLength($7)+5);
 356                   }
 357                   bufferConcat($5, $9);
 358                   bufferConcat($5, $7);
 359                   bufferWriteU8($5, SWFACTION_BRANCHALWAYS);
 360                   bufferWriteS16($5, 2);
 361                   bufferWriteS16($5, -(bufferLength($5)+2));
 362                   bufferResolveJumps($5);
 363                   $$ = $3;
 364                   if(!$$) $$ = newBuffer();
 365                   bufferConcat($$, $5);
 366                 }
 367         ;
 368
 369 assign_stmts_opt
 370         : /* empty */                           { $$ = NULL; }
 371         | assign_stmts
 372         ;
 373
 374 cont_stmt
 375         : CONTINUE ';'
 376                 { $$ = newBuffer();
 377                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 378                   bufferWriteS16($$, 2);
 379                   bufferWriteS16($$, MAGIC_CONTINUE_NUMBER); }
 380         ;
 381
 382 break_stmt
 383         : BREAK ';'
 384                 { $$ = newBuffer();
 385                   bufferWriteU8($$, SWFACTION_BRANCHALWAYS);
 386                   bufferWriteS16($$, 2);
 387                   bufferWriteS16($$, MAGIC_BREAK_NUMBER); }
 388         ;
 389
 390 void_function_call
 391         : STOPDRAG '(' ')' /* no args */
 392                 { $$ = newBuffer();
 393                   bufferWriteU8($$, SWFACTION_STOPDRAGMOVIE); }
 394
 395         | CALLFRAME '(' variable ')'
 396                 { $$ = newBuffer();
 397                   bufferWriteString($$, $3, strlen($3)+1);
 398                   bufferWriteU8($$, SWFACTION_CALLFRAME);
 399                   bufferWriteS16($$, 0);
 400                   free($3); }
 401
 402         | CALLFRAME '(' STRING ')'
 403                 { $$ = newBuffer();
 404                   bufferWriteString($$, $3, strlen($3)+1);
 405                   bufferWriteU8($$, SWFACTION_CALLFRAME);
 406                   bufferWriteS16($$, 0);
 407                   free($3); }
 408
 409         | REMOVECLIP '(' expr ')'
 410                 { $$ = $3;
 411                   bufferWriteU8($$, SWFACTION_REMOVECLIP); }
 412
 413         | TRACE '(' expr ')'
 414                 { $$ = $3;
 415                   bufferWriteU8($$, SWFACTION_TRACE); }
 416
 417         /* getURL2(url, window, [method]) */
 418         | GETURL '(' expr ',' expr ')'
 419                 { $$ = $3;
 420                   bufferConcat($$, $5);
 421                   bufferWriteU8($$, SWFACTION_GETURL2);
 422                   bufferWriteS16($$, 1);
 423                   bufferWriteU8($$, GETURL_METHOD_NOSEND); }
 424
 425         | GETURL '(' expr ',' expr ',' GETURL_METHOD ')'
 426                 { $$ = $3;
 427                   bufferConcat($$, $5);
 428                   bufferWriteU8($$, SWFACTION_GETURL2);
 429                   bufferWriteS16($$, 1);
 430                   bufferWriteU8($$, $7); }
 431
 432         | GETURL1 '(' STRING ',' STRING ')'
 433                 { $$ = newBuffer();
 434                   bufferWriteU8($$, SWFACTION_GETURL);
 435                   bufferWriteS16($$, strlen($3) + strlen($5) + 2);
 436                   bufferWriteHardString($$, (byte*)$3, strlen($3));
 437                   bufferWriteU8($$, 0);
 438                   bufferWriteHardString($$, (byte*)$5, strlen($5));
 439                   bufferWriteU8($$, 0); }
 440
 441         | LOADMOVIE '(' expr ',' expr ')'
 442                 { $$ = $3;
 443                   bufferConcat($$, $5);
 444                   bufferWriteU8($$, SWFACTION_GETURL2);
 445                   bufferWriteS16($$, 1);
 446                   bufferWriteU8($$, GETURL_METHOD_NOSEND | GETURL_LOADMOVIE); }
 447
 448         | LOADMOVIE '(' expr ',' expr ',' GETURL_METHOD ')'
 449                 { $$ = $3;
 450                   bufferConcat($$, $5);
 451                   bufferWriteU8($$, SWFACTION_GETURL2);
 452                   bufferWriteS16($$, 1);
 453                   bufferWriteU8($$, $7 | GETURL_LOADMOVIE); }
 454
 455         | LOADVARIABLES '(' expr ',' expr ')'
 456                 { $$ = $3;
 457                   bufferConcat($$, $5);
 458                   bufferWriteU8($$, SWFACTION_GETURL2);
 459                   bufferWriteS16($$, 1);
 460                   bufferWriteU8($$, GETURL_METHOD_NOSEND | GETURL_LOADVARIABLES); }
 461
 462         | LOADVARIABLES '(' expr ',' expr ',' GETURL_METHOD ')'
 463                 { $$ = $3;
 464                   bufferConcat($$, $5);
 465                   bufferWriteU8($$, SWFACTION_GETURL2);
 466                   bufferWriteS16($$, 1);
 467                   bufferWriteU8($$, $7 | GETURL_LOADVARIABLES); }
 468
 469         /* startDrag(target, lock, [left, right, top, bottom]) */
 470         | STARTDRAG '(' expr ',' expr ')'
 471                 { $$ = newBuffer();
 472                   bufferWriteString($$, "0", 2); /* no constraint */
 473                   bufferConcat($$, $5);
 474                   bufferConcat($$, $3);
 475                   bufferWriteU8($$, SWFACTION_STARTDRAGMOVIE); }
 476
 477         | STARTDRAG '(' expr ',' expr ',' expr ',' expr ',' expr ',' expr ')'
 478                 { $$ = newBuffer();
 479                   bufferConcat($$, $7);
 480                   bufferConcat($$, $11);
 481                   bufferConcat($$, $9);
 482                   bufferConcat($$, $13);
 483                   bufferWriteString($$, "1", 2); /* has constraint */
 484                   bufferConcat($$, $5);
 485                   bufferConcat($$, $3);
 486                   bufferWriteU8($$, SWFACTION_STARTDRAGMOVIE); }
 487
 488         /* duplicateClip(target, new, depth) */
 489         | DUPLICATECLIP '(' expr ',' expr ',' expr ')'
 490                 { $$ = $3;
 491                   bufferConcat($$, $5);
 492                   bufferConcat($$, $7);
 493                   bufferWriteWTHITProperty($$);
 494                   bufferWriteU8($$, SWFACTION_ADD); /* see docs for explanation */
 495                   bufferWriteU8($$, SWFACTION_DUPLICATECLIP); }
 496
 497         /* v3 actions */
 498         | NEXTFRAME '(' ')'
 499                 { $$ = newBuffer();
 500                   bufferWriteU8($$, SWFACTION_NEXTFRAME); }
 501
 502         | PREVFRAME '(' ')'
 503                 { $$ = newBuffer();
 504                   bufferWriteU8($$, SWFACTION_PREVFRAME); }
 505
 506         | PLAY '(' ')'
 507                 { $$ = newBuffer();
 508                   bufferWriteU8($$, SWFACTION_PLAY); }
 509
 510         | STOP '(' ')'
 511                 { $$ = newBuffer();
 512                   bufferWriteU8($$, SWFACTION_STOP); }
 513
 514         | TOGGLEQUALITY '(' ')'
 515                 { $$ = newBuffer();
 516                   bufferWriteU8($$, SWFACTION_TOGGLEQUALITY); }
 517
 518         | STOPSOUNDS '(' ')'
 519                 { $$ = newBuffer();
 520                   bufferWriteU8($$, SWFACTION_STOPSOUNDS); }
 521
 522         | GOTOFRAME '(' NUMBER ')'
 523                 { $$ = newBuffer();
 524                   bufferWriteU8($$, SWFACTION_GOTOFRAME);
 525                   bufferWriteS16($$, 2);
 526                   bufferWriteS16($$, atoi($3));
 527                   free($3); }
 528
 529         | GOTOFRAME '(' STRING ')'
 530                 { $$ = newBuffer();
 531                   bufferWriteU8($$, SWFACTION_GOTOLABEL);
 532                   bufferWriteS16($$, strlen($3)+1);
 533                   bufferWriteHardString($$, (byte*)$3, strlen($3)+1);
 534                   free($3); }
 535
 536         | GOTOFRAME '(' expr ')'
 537                 { $$ = $3;
 538                   bufferWriteU8($$, SWFACTION_GOTOEXPRESSION);
 539                   bufferWriteS16($$, 1);
 540                   bufferWriteU8($$, 0); } /* XXX - and stop */
 541
 542         | GOTOANDPLAY '(' expr ')'
 543                 { $$ = $3;
 544                   bufferWriteU8($$, SWFACTION_GOTOEXPRESSION);
 545                   bufferWriteS16($$, 1);
 546                   bufferWriteU8($$, 1); } /* XXX - and play */
 547
 548         | SETTARGET '(' STRING ')'
 549                 { $$ = newBuffer();
 550                   bufferWriteU8($$, SWFACTION_SETTARGET);
 551                   bufferWriteS16($$, strlen($3)+1);
 552                   bufferWriteHardString($$, (byte*)$3, strlen($3)+1);
 553                   free($3); }
 554
 555         | SETTARGET '(' expr ')'
 556                 { $$ = $3;
 557                   bufferWriteU8($$, SWFACTION_SETTARGETEXPRESSION); }
 558
 559         | TELLTARGET '(' STRING ')' stmt
 560                 { $$ = newBuffer();
 561                         /* SetTarget(STRING) */
 562                   bufferWriteU8($$, SWFACTION_SETTARGET);
 563                   bufferWriteS16($$, strlen($3)+1);
 564                   bufferWriteHardString($$, (byte*)$3, strlen($3)+1);
 565                         /* stmt */
 566                   bufferConcat($$, $5);
 567                         /* SetTarget('') */
 568                   bufferWriteU8($$, SWFACTION_SETTARGET);
 569                   bufferWriteS16($$, 1);
 570                   bufferWriteU8($$, 0);
 571                   free($3); }
 572
 573         | TELLTARGET '(' expr ')' stmt
 574                 { $$ = $3;
 575                         /* SetTarget(expr) */
 576                   bufferWriteU8($$, SWFACTION_SETTARGETEXPRESSION);
 577                         /* stmt */
 578                   bufferConcat($$, $5);
 579                         /* SetTarget('') */
 580                   bufferWriteU8($$, SWFACTION_SETTARGET);
 581                   bufferWriteS16($$, 1);
 582                   bufferWriteU8($$, 0); }
 583         ;
 584
 585 function_call
 586         : EVAL '(' expr ')'
 587                 { $$ = $3;
 588                   bufferWriteU8($$, SWFACTION_GETVARIABLE); }
 589
 590         | TIME '(' ')'
 591                 { $$ = newBuffer();
 592                   bufferWriteU8($$, SWFACTION_GETTIMER); }
 593
 594         | RANDOM '(' expr ')'
 595                 { $$ = $3;
 596                   bufferWriteU8($$, SWFACTION_RANDOM); }
 597
 598         | LENGTH '(' expr ')'
 599                 { $$ = $3;
 600                   bufferWriteU8($$, SWFACTION_STRINGLENGTH); }
 601
 602         | INT '(' expr ')'
 603                 { $$ = $3;
 604                   bufferWriteU8($$, SWFACTION_INT); }
 605
 606         | ORD '(' expr ')'
 607                 { $$ = $3;
 608                   bufferWriteU8($$, SWFACTION_ORD); }
 609
 610         | CHR '(' expr ')'
 611                 { $$ = $3;
 612                   bufferWriteU8($$, SWFACTION_CHR); }
 613
 614         | CONCAT '(' expr ',' expr ')'
 615                 { $$ = $3;
 616                   bufferConcat($$, $5);
 617                   bufferWriteU8($$, SWFACTION_STRINGCONCAT); }
 618
 619         | SUBSTR '(' expr ',' expr ',' expr ')'
 620                 { $$ = $3;
 621                   bufferConcat($$, $5);
 622                   bufferConcat($$, $7);
 623                   bufferWriteU8($$, SWFACTION_SUBSTRING); }
 624
 625         | GETPROPERTY '(' expr ',' STRING ')'
 626                 { $$ = newBuffer();
 627                   bufferConcat($$, $3);
 628                   bufferWriteGetProperty($$, $5);
 629                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
 630                   free($5); }
 631         ;
 632
 633 pf_expr
 634         : lhs_expr "++" %prec POSTFIX
 635                 { $$ = newBuffer();
 636                   bufferWriteBuffer($$, $1);
 637                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 638                   bufferWriteBuffer($$, $1);
 639                   bufferConcat($$, $1);
 640                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 641                   bufferWriteString($$, "1", 2);
 642                   bufferWriteU8($$, SWFACTION_ADD);
 643                   bufferWriteU8($$, SWFACTION_SETVARIABLE); }
 644
 645         | lhs_expr "--" %prec POSTFIX
 646                 { $$ = newBuffer();
 647                   bufferWriteBuffer($$, $1);
 648                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 649                   bufferWriteBuffer($$, $1);
 650                   bufferConcat($$, $1);
 651                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 652                   bufferWriteString($$, "1", 2);
 653                   bufferWriteU8($$, SWFACTION_SUBTRACT);
 654                   bufferWriteU8($$, SWFACTION_SETVARIABLE); }
 655         ;
 656
 657 /* these leave a value on the stack */
 658 rhs_expr
 659         : function_call
 660
 661         | '(' rhs_expr ')'
 662                 { $$ = $2; }
 663
 664         | NUMBER
 665                 { $$ = newBuffer();
 666                   bufferWriteString($$, $1, strlen($1)+1);
 667                   free($1); }
 668
 669         | '-' NUMBER %prec NEGATE
 670                 { $$ = newBuffer();
 671                   bufferWriteString($$, "-", 2);
 672                   bufferWriteString($$, $2, strlen($2)+1);
 673                   free($2); }
 674
 675         | STRING
 676                 { $$ = newBuffer();
 677                   bufferWriteString($$, $1, strlen($1)+1);
 678                   free($1); }
 679
 680         | variable
 681                 { $$ = newBuffer();
 682                   bufferWriteString($$, $1, strlen($1)+1);
 683                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 684                   free($1); }
 685
 686         | sprite
 687                 { $$ = newBuffer();
 688                   bufferWriteString($$, $1, strlen($1)+1);
 689                   free($1); }
 690
 691         | sprite '.' IDENTIFIER
 692                 { $$ = newBuffer();
 693                   bufferWriteString($$, $1, strlen($1)+1);
 694                   bufferWriteGetProperty($$, $3);
 695                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
 696                   free($3);
 697                   free($1); }
 698
 699         | "++" sprite '.' IDENTIFIER
 700                 { $$ = newBuffer();
 701                   bufferWriteString($$, $2, strlen($2)+1);
 702                   bufferWriteGetProperty($$, $4);
 703                   bufferWriteString($$, $2, strlen($2)+1);
 704                   bufferWriteSetProperty($$, $4);
 705                   bufferWriteString($$, $2, strlen($2)+1);
 706                   bufferWriteGetProperty($$, $4);
 707                   bufferWriteString($$, "1", 2);
 708                   bufferWriteU8($$, SWFACTION_ADD);
 709                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
 710                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
 711                   free($2);
 712                   free($4); }
 713
 714         | "++" lhs_expr
 715                 { $$ = $2;
 716                   bufferWriteU8($$, SWFACTION_DUP);
 717                   bufferWriteU8($$, SWFACTION_DUP);
 718                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 719                   bufferWriteString($$, "1", 2);
 720                   bufferWriteU8($$, SWFACTION_ADD);
 721                   bufferWriteU8($$, SWFACTION_SETVARIABLE);
 722                   bufferWriteU8($$, SWFACTION_GETVARIABLE); }
 723
 724         | "--" sprite '.' IDENTIFIER
 725                 { $$ = newBuffer();
 726                   bufferWriteString($$, $2, strlen($2)+1);
 727                   bufferWriteGetProperty($$, $4);
 728                   bufferWriteString($$, $2, strlen($2)+1);
 729                   bufferWriteSetProperty($$, $4);
 730                   bufferWriteString($$, $2, strlen($2)+1);
 731                   bufferWriteGetProperty($$, $4);
 732                   bufferWriteString($$, "1", 2);
 733                   bufferWriteU8($$, SWFACTION_ADD);
 734                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
 735                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
 736                   free($2);
 737                   free($4); }
 738
 739         | "--" lhs_expr
 740                 { $$ = $2;
 741                   bufferWriteU8($$, SWFACTION_DUP);
 742                   bufferWriteU8($$, SWFACTION_DUP);
 743                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 744                   bufferWriteString($$, "1", 2);
 745                   bufferWriteU8($$, SWFACTION_SUBTRACT);
 746                   bufferWriteU8($$, SWFACTION_SETVARIABLE);
 747                   bufferWriteU8($$, SWFACTION_GETVARIABLE); }
 748
 749         | '-' rhs_expr %prec UMINUS
 750                 { $$ = $2;
 751                   bufferWriteString($2, "-1", 3);
 752                   bufferWriteU8($2, SWFACTION_MULTIPLY); }
 753
 754         | '!' rhs_expr
 755                 { $$ = $2;
 756                   bufferWriteU8($2, SWFACTION_LOGICALNOT); }
 757
 758         | lhs_expr '=' rhs_expr /* assign and leave copy on stack */
 759                 { $$ = $1;
 760                   bufferConcat($$, $3);
 761                   bufferWriteU8($$, SWFACTION_DUP);
 762                   bufferWriteU8($$, SWFACTION_SETVARIABLE); }
 763
 764         | rhs_expr '*' rhs_expr
 765                 { $$ = $1;
 766                   bufferConcat($$, $3);
 767                   bufferWriteU8($$, SWFACTION_MULTIPLY); }
 768
 769         | rhs_expr '/' rhs_expr
 770                 { $$ = $1;
 771                   bufferConcat($$, $3);
 772                   bufferWriteU8($$, SWFACTION_DIVIDE); }
 773
 774         | rhs_expr '+' rhs_expr
 775                 { $$ = $1;
 776                   bufferConcat($$, $3);
 777                   bufferWriteU8($$, SWFACTION_ADD); }
 778
 779         | rhs_expr '-' rhs_expr
 780                 { $$ = $1;
 781                   bufferConcat($$, $3);
 782                   bufferWriteU8($$, SWFACTION_SUBTRACT); }
 783
 784         | rhs_expr '&' rhs_expr
 785                 { $$ = $1;
 786                   bufferConcat($$, $3);
 787                   bufferWriteU8($$, SWFACTION_STRINGCONCAT); }
 788
 789         | rhs_expr '<' rhs_expr
 790                 { $$ = $1;
 791                   bufferConcat($$, $3);
 792                   bufferWriteU8($$, SWFACTION_LESSTHAN); }
 793
 794         | rhs_expr '>' rhs_expr
 795                 { $$ = $3;
 796                   bufferConcat($$, $1);
 797                   bufferWriteU8($$, SWFACTION_LESSTHAN); }
 798
 799         | rhs_expr "<=" rhs_expr
 800                 { $$ = $3;
 801                   bufferConcat($$, $1);
 802                   bufferWriteU8($$, SWFACTION_LESSTHAN);
 803                   bufferWriteU8($$, SWFACTION_LOGICALNOT); }
 804
 805         | rhs_expr ">=" rhs_expr
 806                 { bufferConcat($1, $3);
 807                   bufferWriteU8($1, SWFACTION_LESSTHAN);
 808                   bufferWriteU8($1, SWFACTION_LOGICALNOT); }
 809
 810         | rhs_expr "!==" rhs_expr
 811                 { bufferConcat($1, $3);
 812                   bufferWriteU8($1, SWFACTION_STRINGEQ);
 813                   bufferWriteU8($1, SWFACTION_LOGICALNOT); }
 814
 815         | rhs_expr "===" rhs_expr
 816                 { bufferConcat($1, $3);
 817                   bufferWriteU8($1, SWFACTION_STRINGEQ); }
 818
 819         | rhs_expr "<=>" rhs_expr
 820                 { bufferConcat($1, $3);
 821                   bufferWriteU8($1, SWFACTION_STRINGCOMPARE); }
 822
 823         | rhs_expr "==" rhs_expr
 824                 { bufferConcat($1, $3);
 825                   bufferWriteU8($1, SWFACTION_EQUAL); }
 826
 827         | rhs_expr "!=" rhs_expr
 828                 { bufferConcat($1, $3);
 829                   bufferWriteU8($1, SWFACTION_EQUAL);
 830                   bufferWriteU8($1, SWFACTION_LOGICALNOT); }
 831
 832         | rhs_expr "&&" rhs_expr
 833                 { bufferConcat($1, $3);
 834                   bufferWriteU8($1, SWFACTION_LOGICALAND); }
 835
 836         | rhs_expr "||" rhs_expr
 837                 { bufferConcat($1, $3);
 838                   bufferWriteU8($1, SWFACTION_LOGICALOR); }
 839
 840         | rhs_expr '?' rhs_expr ':' rhs_expr
 841                 { bufferWriteU8($1, SWFACTION_BRANCHIFTRUE);
 842                   bufferWriteS16($1, 2);
 843                   bufferWriteS16($1, bufferLength($5)+5);
 844                   bufferConcat($1, $5);
 845                   bufferWriteU8($1, SWFACTION_BRANCHALWAYS);
 846                   bufferWriteS16($1, 2);
 847                   bufferWriteS16($1, bufferLength($3));
 848                   bufferConcat($1, $3); }
 849         ;
 850
 851 variable
 852         : IDENTIFIER
 853
 854         | sprite ':' IDENTIFIER
 855                 { $$ = $1;
 856                   $$ = stringConcat($$, strdup(":"));
 857                   $$ = stringConcat($$, $3); }
 858         ;
 859
 860 sprite
 861         : THIS
 862                 { $$ = strdup(""); }
 863
 864         | '.'
 865                 { $$ = strdup(""); }
 866
 867         | '/'
 868                 { $$ = strdup("/"); }
 869
 870         | PARENT
 871                 { $$ = strdup(".."); }
 872
 873         | IDENTIFIER
 874                 { $$ = $1; }
 875
 876         | PATH
 877                 { $$ = $1; }
 878         ;
 879
 880 lhs_expr
 881         : variable
 882                 { $$ = newBuffer();
 883                   bufferWriteString($$, $1, strlen($1)+1);
 884                   free($1); }
 885
 886         | STRING
 887                 { $$ = newBuffer();
 888                   bufferWriteString($$, $1, strlen($1)+1);
 889                   free($1); }
 890
 891         | '(' rhs_expr ')'      { $$ = $2; }
 892         ;
 893
 894 assign_stmt
 895         : pf_expr
 896
 897         | void_function_call
 898
 899         | "++" lhs_expr
 900                 { $$ = $2;
 901                   bufferWriteBuffer($$, $2);
 902                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 903                   bufferWriteString($$, "1", 2);
 904                   bufferWriteU8($$, SWFACTION_ADD);
 905                   bufferWriteU8($$, SWFACTION_SETVARIABLE); }
 906
 907         | "--" lhs_expr
 908                 { $$ = $2;
 909                   bufferWriteBuffer($$, $2);
 910                   bufferWriteU8($$, SWFACTION_GETVARIABLE);
 911                   bufferWriteString($$, "1", 2);
 912                   bufferWriteU8($$, SWFACTION_SUBTRACT);
 913                   bufferWriteU8($$, SWFACTION_SETVARIABLE); }
 914
 915         | "++" sprite '.' IDENTIFIER
 916                 { $$ = newBuffer();
 917                   bufferWriteString($$, $2, strlen($2)+1);
 918                   bufferWriteGetProperty($$, $4);
 919                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
 920                   bufferWriteString($$, "1", 2);
 921                   bufferWriteU8($$, SWFACTION_ADD);
 922                   bufferWriteString($$, $2, strlen($2)+1);
 923                   bufferWriteSetProperty($$, $4);
 924                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
 925                   free($2);
 926                   free($4); }
 927
 928         | "--" sprite '.' IDENTIFIER
 929                 { $$ = newBuffer();
 930                   bufferWriteString($$, $2, strlen($2)+1);
 931                   bufferWriteGetProperty($$, $4);
 932                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
 933                   bufferWriteString($$, "1", 2);
 934                   bufferWriteU8($$, SWFACTION_SUBTRACT);
 935                   bufferWriteString($$, $2, strlen($2)+1);
 936                   bufferWriteSetProperty($$, $4);
 937                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
 938                   free($2);
 939                   free($4); }
 940
 941         | lhs_expr '=' rhs_expr
 942                 { bufferConcat($1, $3);
 943                   bufferWriteU8($1, SWFACTION_SETVARIABLE); }
 944
 945         | lhs_expr "*=" rhs_expr
 946                 { bufferWriteBuffer($1, $1);
 947                   bufferWriteU8($1, SWFACTION_GETVARIABLE);
 948                   bufferConcat($1, $3);
 949                   bufferWriteU8($1, SWFACTION_MULTIPLY);
 950                   bufferWriteU8($1, SWFACTION_SETVARIABLE); }
 951
 952         | lhs_expr "/=" rhs_expr
 953                 { bufferWriteBuffer($1, $1);
 954                   bufferWriteU8($1, SWFACTION_GETVARIABLE);
 955                   bufferConcat($1, $3);
 956                   bufferWriteU8($1, SWFACTION_DIVIDE);
 957                   bufferWriteU8($1, SWFACTION_SETVARIABLE); }
 958
 959         | lhs_expr "+=" rhs_expr
 960                 { bufferWriteBuffer($1, $1);
 961                   bufferWriteU8($1, SWFACTION_GETVARIABLE);
 962                   bufferConcat($1, $3);
 963                   bufferWriteU8($1, SWFACTION_ADD);
 964                   bufferWriteU8($1, SWFACTION_SETVARIABLE); }
 965
 966         | lhs_expr "-=" rhs_expr
 967                 { bufferWriteBuffer($1, $1);
 968                   bufferWriteU8($1, SWFACTION_GETVARIABLE);
 969                   bufferConcat($1, $3);
 970                   bufferWriteU8($1, SWFACTION_SUBTRACT);
 971                   bufferWriteU8($1, SWFACTION_SETVARIABLE); }
 972
 973         | sprite '.' IDENTIFIER '=' rhs_expr
 974                 { $$ = newBuffer();
 975                   bufferWriteString($$, $1, strlen($1)+1);
 976                   bufferWriteSetProperty($$, $3);
 977                   bufferConcat($$,$5);
 978                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
 979                   free($1);
 980                   free($3); }
 981
 982         | sprite '.' IDENTIFIER "*=" rhs_expr
 983                 { $$ = newBuffer();
 984                   bufferWriteString($$, $1, strlen($1)+1);
 985                   bufferWriteSetProperty($$, $3);
 986                   bufferWriteString($$, $1, strlen($1)+1);
 987                   bufferWriteGetProperty($$, $3);
 988                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
 989                   bufferConcat($$, $5);
 990                   bufferWriteU8($$, SWFACTION_MULTIPLY);
 991                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
 992                   free($1);
 993                   free($3); }
 994
 995         | sprite '.' IDENTIFIER "/=" rhs_expr
 996                 { $$ = newBuffer();
 997                   bufferWriteString($$, $1, strlen($1)+1);
 998                   bufferWriteSetProperty($$, $3);
 999                   bufferWriteString($$, $1, strlen($1)+1);
1000                   bufferWriteGetProperty($$, $3);
1001                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
1002                   bufferConcat($$, $5);
1003                   bufferWriteU8($$, SWFACTION_DIVIDE);
1004                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
1005                   free($1);
1006                   free($3); }
1007
1008         | sprite '.' IDENTIFIER "+=" rhs_expr
1009                 { $$ = newBuffer();
1010                   bufferWriteString($$, $1, strlen($1)+1);
1011                   bufferWriteSetProperty($$, $3);
1012                   bufferWriteString($$, $1, strlen($1)+1);
1013                   bufferWriteGetProperty($$, $3);
1014                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
1015                   bufferConcat($$, $5);
1016                   bufferWriteU8($$, SWFACTION_ADD);
1017                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
1018                   free($1);
1019                   free($3); }
1020
1021         | sprite '.' IDENTIFIER "-=" rhs_expr
1022                 { $$ = newBuffer();
1023                   bufferWriteString($$, $1, strlen($1)+1);
1024                   bufferWriteSetProperty($$, $3);
1025                   bufferWriteString($$, $1, strlen($1)+1);
1026                   bufferWriteGetProperty($$, $3);
1027                   bufferWriteU8($$, SWFACTION_GETPROPERTY);
1028                   bufferConcat($$, $5);
1029                   bufferWriteU8($$, SWFACTION_SUBTRACT);
1030                   bufferWriteU8($$, SWFACTION_SETPROPERTY);
1031                   free($1);
1032                   free($3); }
1033         ;
1034
1035 expr
1036         : rhs_expr
1037         ;
1038
1039 %%