dlls/jscript/lex.c

   1 /*
   2  * Copyright 2008 Jacek Caban for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <math.h>
  20 #include <limits.h>
  21
  22 #include "jscript.h"
  23 #include "activscp.h"
  24 #include "objsafe.h"
  25 #include "engine.h"
  26
  27 #include "parser.tab.h"
  28
  29 #include "wine/debug.h"
  30 #include "wine/unicode.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(jscript);
  33
  34 #define LONGLONG_MAX (((LONGLONG)0x7fffffff<<32)|0xffffffff)
  35
  36 static const WCHAR breakW[] = {'b','r','e','a','k',0};
  37 static const WCHAR caseW[] = {'c','a','s','e',0};
  38 static const WCHAR catchW[] = {'c','a','t','c','h',0};
  39 static const WCHAR continueW[] = {'c','o','n','t','i','n','u','e',0};
  40 static const WCHAR defaultW[] = {'d','e','f','a','u','l','t',0};
  41 static const WCHAR deleteW[] = {'d','e','l','e','t','e',0};
  42 static const WCHAR doW[] = {'d','o',0};
  43 static const WCHAR elseW[] = {'e','l','s','e',0};
  44 static const WCHAR falseW[] = {'f','a','l','s','e',0};
  45 static const WCHAR finallyW[] = {'f','i','n','a','l','l','y',0};
  46 static const WCHAR forW[] = {'f','o','r',0};
  47 static const WCHAR functionW[] = {'f','u','n','c','t','i','o','n',0};
  48 static const WCHAR ifW[] = {'i','f',0};
  49 static const WCHAR inW[] = {'i','n',0};
  50 static const WCHAR instanceofW[] = {'i','n','s','t','a','n','c','e','o','f',0};
  51 static const WCHAR newW[] = {'n','e','w',0};
  52 static const WCHAR nullW[] = {'n','u','l','l',0};
  53 static const WCHAR returnW[] = {'r','e','t','u','r','n',0};
  54 static const WCHAR switchW[] = {'s','w','i','t','c','h',0};
  55 static const WCHAR thisW[] = {'t','h','i','s',0};
  56 static const WCHAR throwW[] = {'t','h','r','o','w',0};
  57 static const WCHAR trueW[] = {'t','r','u','e',0};
  58 static const WCHAR tryW[] = {'t','r','y',0};
  59 static const WCHAR typeofW[] = {'t','y','p','e','o','f',0};
  60 static const WCHAR undefinedW[] = {'u','n','d','e','f','i','n','e','d',0};
  61 static const WCHAR varW[] = {'v','a','r',0};
  62 static const WCHAR voidW[] = {'v','o','i','d',0};
  63 static const WCHAR whileW[] = {'w','h','i','l','e',0};
  64 static const WCHAR withW[] = {'w','i','t','h',0};
  65
  66 static const struct {
  67     const WCHAR *word;
  68     int token;
  69 } keywords[] = {
  70     {breakW,       kBREAK},
  71     {caseW,        kCASE},
  72     {catchW,       kCATCH},
  73     {continueW,    kCONTINUE},
  74     {defaultW,     kDEFAULT},
  75     {deleteW,      kDELETE},
  76     {doW,          kDO},
  77     {elseW,        kELSE},
  78     {falseW,       kFALSE},
  79     {finallyW,     kFINALLY},
  80     {forW,         kFOR},
  81     {functionW,    kFUNCTION},
  82     {ifW,          kIF},
  83     {inW,          kIN},
  84     {instanceofW,  kINSTANCEOF},
  85     {newW,         kNEW},
  86     {nullW,        kNULL},
  87     {returnW,      kRETURN},
  88     {switchW,      kSWITCH},
  89     {thisW,        kTHIS},
  90     {throwW,       kTHROW},
  91     {trueW,        kTRUE},
  92     {tryW,         kTRY},
  93     {typeofW,      kTYPEOF},
  94     {undefinedW,   kUNDEFINED},
  95     {varW,         kVAR},
  96     {voidW,        kVOID},
  97     {whileW,       kWHILE},
  98     {withW,        kWITH}
  99 };
 100
 101 static int lex_error(parser_ctx_t *ctx, HRESULT hres)
 102 {
 103     ctx->hres = hres;
 104     return -1;
 105 }
 106
 107 static int check_keyword(parser_ctx_t *ctx, const WCHAR *word, const WCHAR **lval)
 108 {
 109     const WCHAR *p1 = ctx->ptr;
 110     const WCHAR *p2 = word;
 111
 112     while(p1 < ctx->end && *p2) {
 113         if(*p1 != *p2)
 114             return *p1 - *p2;
 115         p1++;
 116         p2++;
 117     }
 118
 119     if(*p2 || (p1 < ctx->end && isalnumW(*p1)))
 120         return 1;
 121
 122     *lval = ctx->ptr;
 123     ctx->ptr = p1;
 124     return 0;
 125 }
 126
 127 /* ECMA-262 3rd Edition    7.3 */
 128 static BOOL is_endline(WCHAR c)
 129 {
 130     return c == '\n' || c == '\r' || c == 0x2028 || c == 0x2029;
 131 }
 132
 133 static BOOL is_identifier_char(WCHAR c)
 134 {
 135     return isalnumW(c) || c == '$' || c == '_' || c == '\\';
 136 }
 137
 138 static int hex_to_int(WCHAR c)
 139 {
 140     if('0' <= c && c <= '9')
 141         return c-'0';
 142
 143     if('a' <= c && c <= 'f')
 144         return c-'a'+10;
 145
 146     if('A' <= c && c <= 'F')
 147         return c-'A'+10;
 148
 149     return -1;
 150 }
 151
 152 static int check_keywords(parser_ctx_t *ctx, const WCHAR **lval)
 153 {
 154     int min = 0, max = sizeof(keywords)/sizeof(keywords[0])-1, r, i;
 155
 156     while(min <= max) {
 157         i = (min+max)/2;
 158
 159         r = check_keyword(ctx, keywords[i].word, lval);
 160         if(!r)
 161             return keywords[i].token;
 162
 163         if(r > 0)
 164             min = i+1;
 165         else
 166             max = i-1;
 167     }
 168
 169     return 0;
 170 }
 171
 172 static void skip_spaces(parser_ctx_t *ctx)
 173 {
 174     while(ctx->ptr < ctx->end && isspaceW(*ctx->ptr)) {
 175         if(is_endline(*ctx->ptr++))
 176             ctx->nl = TRUE;
 177     }
 178 }
 179
 180 static BOOL skip_html_comment(parser_ctx_t *ctx)
 181 {
 182     const WCHAR html_commentW[] = {'<','!','-','-',0};
 183
 184     if(!ctx->is_html || ctx->ptr+3 >= ctx->end ||
 185         memcmp(ctx->ptr, html_commentW, sizeof(WCHAR)*4))
 186         return FALSE;
 187
 188     ctx->nl = TRUE;
 189     while(ctx->ptr < ctx->end && !is_endline(*ctx->ptr++));
 190
 191     return TRUE;
 192 }
 193
 194 static BOOL skip_comment(parser_ctx_t *ctx)
 195 {
 196     if(ctx->ptr+1 >= ctx->end || *ctx->ptr != '/')
 197         return FALSE;
 198
 199     switch(ctx->ptr[1]) {
 200     case '*':
 201         ctx->ptr += 2;
 202         while(ctx->ptr+1 < ctx->end && (ctx->ptr[0] != '*' || ctx->ptr[1] != '/'))
 203             ctx->ptr++;
 204
 205         if(ctx->ptr[0] == '*' && ctx->ptr[1] == '/') {
 206             ctx->ptr += 2;
 207         }else {
 208             WARN("unexpected end of file (missing end of comment)\n");
 209             ctx->ptr = ctx->end;
 210         }
 211         break;
 212     case '/':
 213         ctx->ptr += 2;
 214         while(ctx->ptr < ctx->end && !is_endline(*ctx->ptr))
 215             ctx->ptr++;
 216         break;
 217     default:
 218         return FALSE;
 219     }
 220
 221     return TRUE;
 222 }
 223
 224 static BOOL unescape(WCHAR *str)
 225 {
 226     WCHAR *pd, *p, c;
 227     int i;
 228
 229     pd = p = str;
 230     while(*p) {
 231         if(*p != '\\') {
 232             *pd++ = *p++;
 233             continue;
 234         }
 235
 236         p++;
 237         c = 0;
 238
 239         switch(*p) {
 240         case '\'':
 241         case '\"':
 242         case '\\':
 243             c = *p;
 244             break;
 245         case 'b':
 246             c = '\b';
 247             break;
 248         case 't':
 249             c = '\t';
 250             break;
 251         case 'n':
 252             c = '\n';
 253             break;
 254         case 'v':
 255             c = '\v';
 256             break;
 257         case 'f':
 258             c = '\f';
 259             break;
 260         case 'r':
 261             c = '\r';
 262             break;
 263         case 'x':
 264             i = hex_to_int(*++p);
 265             if(i == -1)
 266                 return FALSE;
 267             c = i << 4;
 268
 269             i = hex_to_int(*++p);
 270             if(i == -1)
 271                 return FALSE;
 272             c += i;
 273             break;
 274         case 'u':
 275             i = hex_to_int(*++p);
 276             if(i == -1)
 277                 return FALSE;
 278             c = i << 12;
 279
 280             i = hex_to_int(*++p);
 281             if(i == -1)
 282                 return FALSE;
 283             c += i << 8;
 284
 285             i = hex_to_int(*++p);
 286             if(i == -1)
 287                 return FALSE;
 288             c += 1 << 4;
 289
 290             i = hex_to_int(*++p);
 291             if(i == -1)
 292                 return FALSE;
 293             c += i;
 294             break;
 295         default:
 296             if(isdigitW(*p)) {
 297                 c = *p++ - '0';
 298                 while(isdigitW(*p))
 299                     c = c*10 + (*p++ - '0');
 300                 *pd++ = c;
 301                 continue;
 302             }
 303
 304             c = *p;
 305         }
 306
 307         *pd++ = c;
 308         p++;
 309     }
 310
 311     *pd = 0;
 312     return TRUE;
 313 }
 314
 315 static int parse_identifier(parser_ctx_t *ctx, const WCHAR **ret)
 316 {
 317     const WCHAR *ptr = ctx->ptr++;
 318     WCHAR *wstr;
 319     int len;
 320
 321     while(ctx->ptr < ctx->end && is_identifier_char(*ctx->ptr))
 322         ctx->ptr++;
 323
 324     len = ctx->ptr-ptr;
 325
 326     *ret = wstr = parser_alloc(ctx, (len+1)*sizeof(WCHAR));
 327     memcpy(wstr, ptr, (len+1)*sizeof(WCHAR));
 328     wstr[len] = 0;
 329
 330     /* FIXME: unescape */
 331     return tIdentifier;
 332 }
 333
 334 static int parse_string_literal(parser_ctx_t *ctx, const WCHAR **ret, WCHAR endch)
 335 {
 336     const WCHAR *ptr = ++ctx->ptr;
 337     WCHAR *wstr;
 338     int len;
 339
 340     while(ctx->ptr < ctx->end && *ctx->ptr != endch) {
 341         if(*ctx->ptr++ == '\\')
 342             ctx->ptr++;
 343     }
 344
 345     if(ctx->ptr == ctx->end) {
 346         WARN("unexpected end of file\n");
 347         return lex_error(ctx, E_FAIL);
 348     }
 349
 350     len = ctx->ptr-ptr;
 351
 352     *ret = wstr = parser_alloc(ctx, (len+1)*sizeof(WCHAR));
 353     memcpy(wstr, ptr, (len+1)*sizeof(WCHAR));
 354     wstr[len] = 0;
 355
 356     ctx->ptr++;
 357
 358     if(!unescape(wstr)) {
 359         WARN("unescape failed\n");
 360         return lex_error(ctx, E_FAIL);
 361     }
 362
 363     return tStringLiteral;
 364 }
 365
 366 static literal_t *alloc_int_literal(parser_ctx_t *ctx, LONG l)
 367 {
 368     literal_t *ret = parser_alloc(ctx, sizeof(literal_t));
 369
 370     ret->vt = VT_I4;
 371     ret->u.lval = l;
 372
 373     return ret;
 374 }
 375
 376 static int parse_double_literal(parser_ctx_t *ctx, LONG int_part, literal_t **literal)
 377 {
 378     LONGLONG d, hlp;
 379     int exp = 0;
 380
 381     if(ctx->ptr == ctx->end || (!isdigitW(*ctx->ptr) &&
 382         *ctx->ptr!='.' && *ctx->ptr!='e' && *ctx->ptr!='E')) {
 383         ERR("Illegal character\n");
 384         return 0;
 385     }
 386
 387     d = int_part;
 388     while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
 389         hlp = d*10 + *(ctx->ptr++) - '0';
 390         if(d>LONGLONG_MAX/10 || hlp<0) {
 391             exp++;
 392             break;
 393         }
 394         else
 395             d = hlp;
 396     }
 397     while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
 398         exp++;
 399         ctx->ptr++;
 400     }
 401
 402     if(*ctx->ptr == '.') ctx->ptr++;
 403
 404     while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
 405         hlp = d*10 + *(ctx->ptr++) - '0';
 406         if(d>LONGLONG_MAX/10 || hlp<0)
 407             break;
 408
 409         d = hlp;
 410         exp--;
 411     }
 412     while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr))
 413         ctx->ptr++;
 414
 415     if(ctx->ptr < ctx->end && (*ctx->ptr == 'e' || *ctx->ptr == 'E')) {
 416         int sign = 1, e = 0;
 417
 418         ctx->ptr++;
 419         if(ctx->ptr < ctx->end) {
 420             if(*ctx->ptr == '+') {
 421                 ctx->ptr++;
 422             }else if(*ctx->ptr == '-') {
 423                 sign = -1;
 424                 ctx->ptr++;
 425             }else if(!isdigitW(*ctx->ptr)) {
 426                 WARN("Expected exponent part\n");
 427                 return lex_error(ctx, E_FAIL);
 428             }
 429         }
 430
 431         if(ctx->ptr == ctx->end) {
 432             WARN("unexpected end of file\n");
 433             return lex_error(ctx, E_FAIL);
 434         }
 435
 436         while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr)) {
 437             if(e > INT_MAX/10 || (e = e*10 + *ctx->ptr++ - '0')<0)
 438                 e = INT_MAX;
 439         }
 440         e *= sign;
 441
 442         if(exp<0 && e<0 && e+exp>0) exp = INT_MIN;
 443         else if(exp>0 && e>0 && e+exp<0) exp = INT_MAX;
 444         else exp += e;
 445     }
 446
 447     *literal = parser_alloc(ctx, sizeof(literal_t));
 448     (*literal)->vt = VT_R8;
 449     (*literal)->u.dval = (double)d*pow(10, exp);
 450
 451     return tNumericLiteral;
 452 }
 453
 454 static int parse_numeric_literal(parser_ctx_t *ctx, literal_t **literal)
 455 {
 456     LONG l, d;
 457
 458     l = *ctx->ptr++ - '0';
 459     if(ctx->ptr == ctx->end) {
 460         *literal = alloc_int_literal(ctx, l);
 461         return tNumericLiteral;
 462     }
 463
 464     if(!l) {
 465         if(*ctx->ptr == 'x' || *ctx->ptr == 'X') {
 466             if(++ctx->ptr == ctx->end) {
 467                 ERR("unexpexted end of file\n");
 468                 return 0;
 469             }
 470
 471             while(ctx->ptr < ctx->end && (d = hex_to_int(*ctx->ptr)) != -1) {
 472                 l = l*16 + d;
 473                 ctx->ptr++;
 474             }
 475
 476             if(ctx->ptr < ctx->end && is_identifier_char(*ctx->ptr)) {
 477                 WARN("unexpected identifier char\n");
 478                 return lex_error(ctx, E_FAIL);
 479             }
 480
 481             *literal = alloc_int_literal(ctx, l);
 482             return tNumericLiteral;
 483         }
 484
 485         if(isdigitW(*ctx->ptr) || is_identifier_char(*ctx->ptr)) {
 486             WARN("wrong char after zero\n");
 487             return lex_error(ctx, E_FAIL);
 488         }
 489
 490         *literal = alloc_int_literal(ctx, 0);
 491     }
 492
 493     while(ctx->ptr < ctx->end && isdigitW(*ctx->ptr))
 494     {
 495         d = l*10 + *(ctx->ptr)-'0';
 496
 497         /* Check for integer overflow */
 498         if (l > INT_MAX/10 || d < 0)
 499             return parse_double_literal(ctx, l, literal);
 500
 501         l = d;
 502         ctx->ptr++;
 503     }
 504
 505     if(ctx->ptr < ctx->end) {
 506         if(*ctx->ptr == '.' || *ctx->ptr == 'e' || *ctx->ptr == 'E')
 507             return parse_double_literal(ctx, l, literal);
 508
 509         if(is_identifier_char(*ctx->ptr)) {
 510             WARN("unexpected identifier char\n");
 511             return lex_error(ctx, E_FAIL);
 512         }
 513     }
 514
 515     *literal = alloc_int_literal(ctx, l);
 516     return tNumericLiteral;
 517 }
 518
 519 int parser_lex(void *lval, parser_ctx_t *ctx)
 520 {
 521     int ret;
 522
 523     ctx->nl = ctx->ptr == ctx->begin;
 524
 525     do {
 526         skip_spaces(ctx);
 527         if(ctx->ptr == ctx->end)
 528             return 0;
 529     }while(skip_comment(ctx) || skip_html_comment(ctx));
 530
 531     if(isalphaW(*ctx->ptr)) {
 532         ret = check_keywords(ctx, lval);
 533         if(ret)
 534             return ret;
 535
 536         return parse_identifier(ctx, lval);
 537     }
 538
 539     if(isdigitW(*ctx->ptr))
 540         return parse_numeric_literal(ctx, lval);
 541
 542     switch(*ctx->ptr) {
 543     case '{':
 544     case '(':
 545     case ')':
 546     case '[':
 547     case ']':
 548     case ';':
 549     case ',':
 550     case '~':
 551     case '?':
 552     case ':':
 553         return *ctx->ptr++;
 554
 555     case '}':
 556         *(const WCHAR**)lval = ctx->ptr++;
 557         return '}';
 558
 559     case '.':
 560         if(++ctx->ptr < ctx->end && isdigitW(*ctx->ptr))
 561             return parse_double_literal(ctx, 0, lval);
 562         return '.';
 563
 564     case '<':
 565         if(++ctx->ptr == ctx->end) {
 566             *(int*)lval = EXPR_LESS;
 567             return tRelOper;
 568         }
 569
 570         switch(*ctx->ptr) {
 571         case '=':  /* <= */
 572             ctx->ptr++;
 573             *(int*)lval = EXPR_LESSEQ;
 574             return tRelOper;
 575         case '<':  /* << */
 576             if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* <<= */
 577                 ctx->ptr++;
 578                 *(int*)lval = EXPR_ASSIGNLSHIFT;
 579                 return tAssignOper;
 580             }
 581             *(int*)lval = EXPR_LSHIFT;
 582             return tShiftOper;
 583         default: /* < */
 584             *(int*)lval = EXPR_LESS;
 585             return tRelOper;
 586         }
 587
 588     case '>':
 589         if(++ctx->ptr == ctx->end) { /* > */
 590             *(int*)lval = EXPR_GREATER;
 591             return tRelOper;
 592         }
 593
 594         switch(*ctx->ptr) {
 595         case '=':  /* >= */
 596             ctx->ptr++;
 597             *(int*)lval = EXPR_GREATEREQ;
 598             return tRelOper;
 599         case '>':  /* >> */
 600             if(++ctx->ptr < ctx->end) {
 601                 if(*ctx->ptr == '=') {  /* >>= */
 602                     ctx->ptr++;
 603                     *(int*)lval = EXPR_ASSIGNRSHIFT;
 604                     return tAssignOper;
 605                 }
 606                 if(*ctx->ptr == '>') {  /* >>> */
 607                     if(++ctx->ptr < ctx->end && *ctx->ptr == '=') {  /* >>>= */
 608                         ctx->ptr++;
 609                         *(int*)lval = EXPR_ASSIGNRRSHIFT;
 610                         return tAssignOper;
 611                     }
 612                     *(int*)lval = EXPR_RRSHIFT;
 613                     return tRelOper;
 614                 }
 615             }
 616             *(int*)lval = EXPR_RSHIFT;
 617             return tShiftOper;
 618         default:
 619             *(int*)lval = EXPR_GREATER;
 620             return tRelOper;
 621         }
 622
 623     case '+':
 624         ctx->ptr++;
 625         if(ctx->ptr < ctx->end) {
 626             switch(*ctx->ptr) {
 627             case '+':  /* ++ */
 628                 ctx->ptr++;
 629                 return tINC;
 630             case '=':  /* += */
 631                 ctx->ptr++;
 632                 *(int*)lval = EXPR_ASSIGNADD;
 633                 return tAssignOper;
 634             }
 635         }
 636         return '+';
 637
 638     case '-':
 639         ctx->ptr++;
 640         if(ctx->ptr < ctx->end) {
 641             switch(*ctx->ptr) {
 642             case '-':  /* -- or --> */
 643                 ctx->ptr++;
 644                 if(ctx->is_html && ctx->nl && ctx->ptr < ctx->end && *ctx->ptr == '>') {
 645                     ctx->ptr++;
 646                     return tHTMLCOMMENT;
 647                 }
 648                 return tDEC;
 649             case '=':  /* -= */
 650                 ctx->ptr++;
 651                 *(int*)lval = EXPR_ASSIGNSUB;
 652                 return tAssignOper;
 653             }
 654         }
 655         return '-';
 656
 657     case '*':
 658         if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* *= */
 659             ctx->ptr++;
 660             *(int*)lval = EXPR_ASSIGNMUL;
 661             return tAssignOper;
 662         }
 663         return '*';
 664
 665     case '%':
 666         if(++ctx->ptr < ctx->end && *ctx->ptr == '=') { /* %= */
 667             ctx->ptr++;
 668             *(int*)lval = EXPR_ASSIGNMOD;
 669             return tAssignOper;
 670         }
 671         return '%';
 672
 673     case '&':
 674         if(++ctx->ptr < ctx->end) {
 675             switch(*ctx->ptr) {
 676             case '=':  /* &= */
 677                 ctx->ptr++;
 678                 *(int*)lval = EXPR_ASSIGNAND;
 679                 return tAssignOper;
 680             case '&':  /* && */
 681                 ctx->ptr++;
 682                 return tANDAND;
 683             }
 684         }
 685         return '&';
 686
 687     case '|':
 688         if(++ctx->ptr < ctx->end) {
 689             switch(*ctx->ptr) {
 690             case '=':  /* |= */
 691                 ctx->ptr++;
 692                 *(int*)lval = EXPR_ASSIGNOR;
 693                 return tAssignOper;
 694             case '|':  /* || */
 695                 ctx->ptr++;
 696                 return tOROR;
 697             }
 698         }
 699         return '|';
 700
 701     case '^':
 702         if(++ctx->ptr < ctx->end && *ctx->ptr == '=') {  /* ^= */
 703             ctx->ptr++;
 704             *(int*)lval = EXPR_ASSIGNXOR;
 705             return tAssignOper;
 706         }
 707         return '^';
 708
 709     case '!':
 710         if(++ctx->ptr < ctx->end && *ctx->ptr == '=') {  /* != */
 711             if(++ctx->ptr < ctx->end && *ctx->ptr == '=') {  /* !== */
 712                 ctx->ptr++;
 713                 *(int*)lval = EXPR_NOTEQEQ;
 714                 return tEqOper;
 715             }
 716             *(int*)lval = EXPR_NOTEQ;
 717             return tEqOper;
 718         }
 719         return '!';
 720
 721     case '=':
 722         if(++ctx->ptr < ctx->end && *ctx->ptr == '=') {  /* == */
 723             if(++ctx->ptr < ctx->end && *ctx->ptr == '=') {  /* === */
 724                 ctx->ptr++;
 725                 *(int*)lval = EXPR_EQEQ;
 726                 return tEqOper;
 727             }
 728             *(int*)lval = EXPR_EQ;
 729             return tEqOper;
 730         }
 731         return '=';
 732
 733     case '/':
 734         if(++ctx->ptr < ctx->end) {
 735             if(*ctx->ptr == '=') {  /* /= */
 736                 ctx->ptr++;
 737                 *(int*)lval = EXPR_ASSIGNDIV;
 738                 return tAssignOper;
 739             }
 740         }
 741         return '/';
 742
 743     case '\"':
 744     case '\'':
 745         return parse_string_literal(ctx, lval, *ctx->ptr);
 746
 747     case '_':
 748     case '$':
 749         return parse_identifier(ctx, lval);
 750     }
 751
 752     WARN("unexpected char '%c' %d\n", *ctx->ptr, *ctx->ptr);
 753     return 0;
 754 }
 755
 756 static void add_object_literal(parser_ctx_t *ctx, DispatchEx *obj)
 757 {
 758     obj_literal_t *literal = parser_alloc(ctx, sizeof(obj_literal_t));
 759
 760     literal->obj = obj;
 761     literal->next = ctx->obj_literals;
 762     ctx->obj_literals = literal;
 763 }
 764
 765 literal_t *parse_regexp(parser_ctx_t *ctx)
 766 {
 767     const WCHAR *re, *flags;
 768     DispatchEx *regexp;
 769     literal_t *ret;
 770     DWORD re_len;
 771     HRESULT hres;
 772
 773     TRACE("\n");
 774
 775     re = ctx->ptr;
 776     while(ctx->ptr < ctx->end && *ctx->ptr != '/') {
 777         if(*ctx->ptr++ == '\\' && ctx->ptr < ctx->end)
 778             ctx->ptr++;
 779     }
 780
 781     if(ctx->ptr == ctx->end) {
 782         WARN("unexpected end of file\n");
 783         return NULL;
 784     }
 785
 786     re_len = ctx->ptr-re;
 787
 788     flags = ++ctx->ptr;
 789     while(ctx->ptr < ctx->end && isalnumW(*ctx->ptr))
 790         ctx->ptr++;
 791
 792     hres = create_regexp_str(ctx->script, re, re_len, flags, ctx->ptr-flags, &regexp);
 793     if(FAILED(hres))
 794         return NULL;
 795
 796     add_object_literal(ctx, regexp);
 797
 798     ret = parser_alloc(ctx, sizeof(literal_t));
 799     ret->vt = VT_DISPATCH;
 800     ret->u.disp = (IDispatch*)_IDispatchEx_(regexp);
 801     return ret;
 802 }