lib/as3/tokenizer.lex

   1 /* tokenizer.lex
   2
   3    Routines for compiling Flash2 AVM2 ABC Actionscript
   4
   5    Extension module for the rfxswf library.
   6    Part of the swftools package.
   7
   8    Copyright (c) 2008 Matthias Kramm <kramm@quiss.org>
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  23 %{
  24
  25
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <stdarg.h>
  30 #include "../utf8.h"
  31 #include "tokenizer.h"
  32 #include "files.h"
  33
  34 static void countlines(char*text, int len) {
  35     int t;
  36     for(t=0;t<len;t++) {
  37         if(text[t]=='\n') {
  38             current_line++;
  39             current_column=0;
  40         } else {
  41             current_column++;
  42         }
  43     }
  44 }
  45
  46 static int verbose = 1;
  47 static void dbg(const char*format, ...)
  48 {
  49     char buf[1024];
  50     int l;
  51     va_list arglist;
  52     if(!verbose)
  53         return;
  54     va_start(arglist, format);
  55     vsprintf(buf, format, arglist);
  56     va_end(arglist);
  57     l = strlen(buf);
  58     while(l && buf[l-1]=='\n') {
  59         buf[l-1] = 0;
  60         l--;
  61     }
  62     printf("(tokenizer) ");
  63     printf("%s\n", buf);
  64     fflush(stdout);
  65 }
  66
  67 void syntaxerror(const char*format, ...)
  68 {
  69     char buf[1024];
  70     int l;
  71     va_list arglist;
  72     if(!verbose)
  73         return;
  74     va_start(arglist, format);
  75     vsprintf(buf, format, arglist);
  76     va_end(arglist);
  77     fprintf(stderr, "%s:%d:%d: error: %s\n", current_filename_short, current_line, current_column, buf);
  78     fflush(stderr);
  79     exit(1);
  80 }
  81 void warning(const char*format, ...)
  82 {
  83     char buf[1024];
  84     int l;
  85     va_list arglist;
  86     if(!verbose)
  87         return;
  88     va_start(arglist, format);
  89     vsprintf(buf, format, arglist);
  90     va_end(arglist);
  91     fprintf(stderr, "%s:%d:%d: warning: %s\n", current_filename_short, current_line, current_column, buf);
  92     fflush(stderr);
  93 }
  94
  95
  96 #ifndef YY_CURRENT_BUFFER
  97 #define YY_CURRENT_BUFFER yy_current_buffer
  98 #endif
  99
 100 void handleInclude(char*text, int len, char quotes)
 101 {
 102     char*filename = 0;
 103     if(quotes) {
 104         char*p1 = strchr(text, '"');
 105         char*p2 = strrchr(text, '"');
 106         if(!p1 || !p2 || p1==p2) {
 107             syntaxerror("Invalid include in line %d\n", current_line);
 108         }
 109         *p2 = 0;
 110         filename = strdup(p1+1);
 111     } else {
 112         int i1=0,i2=len;
 113         // find start
 114         while(!strchr(" \n\r\t", text[i1])) i1++;
 115         // strip
 116         while(strchr(" \n\r\t", text[i1])) i1++;
 117         while(strchr(" \n\r\t", text[i2-1])) i2--;
 118         if(i2!=len) text[i2]=0;
 119         filename = strdup(&text[i1]);
 120     }
 121
 122     char*fullfilename = enter_file(filename, YY_CURRENT_BUFFER);
 123     yyin = fopen(fullfilename, "rb");
 124     if (!yyin) {
 125         syntaxerror("Couldn't open include file \"%s\"\n", fullfilename);
 126     }
 127
 128     yy_switch_to_buffer(yy_create_buffer( yyin, YY_BUF_SIZE ) );
 129     //BEGIN(INITIAL); keep context
 130 }
 131
 132 string_t string_unescape(const char*in, int l)
 133 {
 134     int len=0;
 135     const char*s = in;
 136     const char*end = &in[l];
 137     char*n = (char*)malloc(l);
 138     char*o = n;
 139     while(s<end) {
 140         if(*s!='\\') {
 141             o[len++] = *s;
 142             s++;
 143             continue;
 144         }
 145         s++; //skip past '\'
 146         if(s==end) syntaxerror("invalid \\ at end of string");
 147
 148         /* handle the various line endings (mac, dos, unix) */
 149         if(*s=='\r') {
 150             s++;
 151             if(s==end) break;
 152             if(*s=='\n')
 153                 s++;
 154             continue;
 155         }
 156         if(*s=='\n')  {
 157             s++;
 158             continue;
 159         }
 160         switch(*s) {
 161             case '\\': o[len++] = '\\';s++; break;
 162             case '"': o[len++] = '"';s++; break;
 163             case 'b': o[len++] = '\b';s++; break;
 164             case 'f': o[len++] = '\f';s++; break;
 165             case 'n': o[len++] = '\n';s++; break;
 166             case 'r': o[len++] = '\r';s++; break;
 167             case 't': o[len++] = '\t';s++; break;
 168             case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': {
 169                 unsigned int num=0;
 170                 int nr = 0;
 171                 while(strchr("01234567", *s) && nr<3 && s<end) {
 172                     num <<= 3;
 173                     num |= *s-'0';
 174                     nr++;
 175                     s++;
 176                 }
 177                 if(num>256)
 178                     syntaxerror("octal number out of range (0-255): %d", num);
 179                 o[len++] = num;
 180                 continue;
 181             }
 182             case 'x': case 'u': {
 183                 int max=2;
 184                 char bracket = 0;
 185                 char unicode = 0;
 186                 if(*s == 'u') {
 187                     max = 6;
 188                     unicode = 1;
 189                 }
 190                 s++;
 191                 if(s==end) syntaxerror("invalid \\u or \\x at end of string");
 192                 if(*s == '{')  {
 193                     s++;
 194                     if(s==end) syntaxerror("invalid \\u{ at end of string");
 195                     bracket=1;
 196                 }
 197                 unsigned int num=0;
 198                 int nr = 0;
 199                 while(strchr("0123456789abcdefABCDEF", *s) && (bracket || nr < max) && s<end) {
 200                     num <<= 4;
 201                     if(*s>='0' && *s<='9') num |= *s - '0';
 202                     if(*s>='a' && *s<='f') num |= *s - 'a' + 10;
 203                     if(*s>='A' && *s<='F') num |= *s - 'A' + 10;
 204                     nr++;
 205                     s++;
 206                 }
 207                 if(bracket) {
 208                     if(*s=='}' && s<end) {
 209                         s++;
 210                     } else {
 211                         syntaxerror("missing terminating '}'");
 212                     }
 213                 }
 214                 if(unicode) {
 215                     char*utf8 = getUTF8(num);
 216                     while(*utf8) {
 217                         o[len++] = *utf8++;
 218                     }
 219                 } else {
 220                     if(num>256)
 221                         syntaxerror("byte out of range (0-255): %d", num);
 222                     o[len++] = num;
 223                 }
 224                 break;
 225             }
 226             default:
 227                 syntaxerror("unknown escape sequence: \"\\%c\"", *s);
 228         }
 229     }
 230     string_t out = string_new(n, len);
 231     o[len]=0;
 232     return out;
 233 }
 234
 235 static void handleString(char*s, int len)
 236 {
 237     if(s[0]=='"') {
 238         if(s[len-1]!='"') syntaxerror("String doesn't end with '\"'");
 239         s++;len-=2;
 240     }
 241     else if(s[0]=='\'') {
 242         if(s[len-1]!='\'') syntaxerror("String doesn't end with '\"'");
 243         s++;len-=2;
 244     }
 245     else syntaxerror("String incorrectly terminated");
 246
 247
 248     avm2_lval.str = string_unescape(s, len);
 249 }
 250
 251
 252 char start_of_expression;
 253
 254 static inline int mkid(int type)
 255 {
 256     char*s = malloc(yyleng+1);
 257     memcpy(s, yytext, yyleng);
 258     s[yyleng]=0;
 259     avm2_lval.id = s;
 260     return type;
 261 }
 262
 263 static inline int m(int type)
 264 {
 265     avm2_lval.token = type;
 266     return type;
 267 }
 268
 269
 270 static char numberbuf[64];
 271 static inline int handlenumber()
 272 {
 273     if(yyleng>sizeof(numberbuf)-1)
 274         syntaxerror("decimal number overflow");
 275
 276     char*s = numberbuf;
 277     memcpy(s, yytext, yyleng);
 278     s[yyleng]=0;
 279
 280     int t;
 281     char is_float=0;
 282     for(t=0;t<yyleng;t++) {
 283         if(yytext[t]=='.') {
 284             if(is_float)
 285                 syntaxerror("Invalid number");
 286             is_float=1;
 287         } else if(!strchr("-0123456789", yytext[t])) {
 288             syntaxerror("Invalid number");
 289         }
 290     }
 291     if(is_float) {
 292         avm2_lval.number_float = atof(s);
 293         return T_FLOAT;
 294     }
 295     char l = (yytext[0]=='-');
 296
 297     char*max = l?"1073741824":"2147483647";
 298     if(yyleng-l>10)
 299         syntaxerror("integer overflow");
 300     if(yyleng-l==10) {
 301         int t;
 302         for(t=0;t<yyleng-l;t++) {
 303             if(yytext[l+t]>max[t])
 304                 syntaxerror("integer overflow %s > %s", s+l,max);
 305             else if(yytext[l+t]<max[t])
 306                 break;
 307         }
 308     }
 309     if(yytext[0]=='-') {
 310         int v = atoi(s);
 311         avm2_lval.number_int = v;
 312         if(v>-128)
 313             return T_BYTE;
 314         else if(v>=-32768)
 315             return T_SHORT;
 316         else
 317             return T_INT;
 318     } else {
 319         unsigned int v = 0;
 320         for(t=0;t<yyleng;t++) {
 321             v*=10;
 322             v+=yytext[t]-'0';
 323         }
 324         avm2_lval.number_uint = v;
 325         if(v<128)
 326             return T_BYTE;
 327         else if(v<32768)
 328             return T_SHORT;
 329         else
 330             return T_UINT;
 331     }
 332 }
 333
 334 void initialize_scanner();
 335 #define YY_USER_INIT initialize_scanner();
 336
 337 #define c() {countlines(yytext, yyleng);}
 338
 339 %}
 340
 341 %s REGEXPOK
 342 %s BEGINNING
 343
 344 NAME     [a-zA-Z_][a-zA-Z0-9_\\]*
 345
 346 NUMBER   -?[0-9]+(\.[0-9]*)?|-?\.[0-9]+
 347
 348 STRING   ["](\\[\x00-\xff]|[^\\"\n])*["]|['](\\[\x00-\xff]|[^\\'\n])*[']
 349 S        [ \n\r\t]
 350 MULTILINE_COMMENT [/][*]+([*][^/]|[^/*]|[^*][/]|[\x00-\x1f])*[*]+[/]
 351 SINGLELINE_COMMENT \/\/[^\n]*\n
 352 REGEXP   [/]([^/\n]|\\[/])*[/][a-zA-Z]*
 353 %%
 354
 355
 356 {SINGLELINE_COMMENT}         {c(); /* single line comment */}
 357 {MULTILINE_COMMENT}          {c(); /* multi line comment */}
 358 [/][*]                       {syntaxerror("syntax error: unterminated comment", yytext);}
 359
 360 ^include{S}+{STRING}{S}*/\n    {c();handleInclude(yytext, yyleng, 1);}
 361 ^include{S}+[^" \t\r\n][\x20-\xff]*{S}*/\n    {c();handleInclude(yytext, yyleng, 0);}
 362 {STRING}                     {c(); BEGIN(INITIAL);handleString(yytext, yyleng);return T_STRING;}
 363
 364 <BEGINNING,REGEXPOK>{
 365 {REGEXP}                     {c(); BEGIN(INITIAL);return m(T_REGEXP);}
 366 }
 367
 368 \xef\xbb\xbf                 {/* utf 8 bom */}
 369 {S}                          {c();}
 370
 371 {NUMBER}                     {c(); BEGIN(INITIAL);return handlenumber();}
 372
 373 3rr0r                        {/* for debugging: generates a tokenizer-level error */
 374                               syntaxerror("3rr0r");}
 375
 376 [&][&]                       {c();BEGIN(REGEXPOK);return m(T_ANDAND);}
 377 [|][|]                       {c();BEGIN(REGEXPOK);return m(T_OROR);}
 378 [!][=]                       {c();BEGIN(REGEXPOK);return m(T_NE);}
 379 [=][=][=]                    {c();BEGIN(REGEXPOK);return m(T_EQEQEQ);}
 380 [=][=]                       {c();BEGIN(REGEXPOK);return m(T_EQEQ);}
 381 [>][=]                       {c();return m(T_GE);}
 382 [<][=]                       {c();return m(T_LE);}
 383 [-][-]                       {c();BEGIN(INITIAL);return m(T_MINUSMINUS);}
 384 [+][+]                       {c();BEGIN(INITIAL);return m(T_PLUSPLUS);}
 385 [+][=]                       {c();return m(T_PLUSBY);}
 386 [-][=]                       {c();return m(T_MINUSBY);}
 387 [/][=]                       {c();return m(T_DIVBY);}
 388 [%][=]                       {c();return m(T_MODBY);}
 389 [*][=]                       {c();return m(T_MULBY);}
 390 [>][>][=]                    {c();return m(T_SHRBY);}
 391 [<][<][=]                    {c();return m(T_SHLBY);}
 392 [>][>][>][=]                 {c();return m(T_USHRBY);}
 393 [<][<]                       {c();return m(T_SHL);}
 394 [>][>][>]                    {c();return m(T_USHR);}
 395 [>][>]                       {c();return m(T_SHR);}
 396 \.\.\.                       {c();return m(T_DOTDOTDOT);}
 397 \.\.                         {c();return m(T_DOTDOT);}
 398 \.                           {c();return m('.');}
 399 ::                           {c();return m(T_COLONCOLON);}
 400 :                            {c();return m(':');}
 401 implements                   {c();return m(KW_IMPLEMENTS);}
 402 interface                    {c();return m(KW_INTERFACE);}
 403 namespace                    {c();return m(KW_NAMESPACE);}
 404 protected                    {c();return m(KW_PROTECTED);}
 405 override                     {c();return m(KW_OVERRIDE);}
 406 internal                     {c();return m(KW_INTERNAL);}
 407 function                     {c();return m(KW_FUNCTION);}
 408 package                      {c();return m(KW_PACKAGE);}
 409 private                      {c();return m(KW_PRIVATE);}
 410 Boolean                      {c();return m(KW_BOOLEAN);}
 411 dynamic                      {c();return m(KW_DYNAMIC);}
 412 extends                      {c();return m(KW_EXTENDS);}
 413 return                       {c();return m(KW_RETURN);}
 414 public                       {c();return m(KW_PUBLIC);}
 415 native                       {c();return m(KW_NATIVE);}
 416 static                       {c();return m(KW_STATIC);}
 417 import                       {c();return m(KW_IMPORT);}
 418 Number                       {c();return m(KW_NUMBER);}
 419 while                        {c();return m(KW_WHILE);}
 420 class                        {c();return m(KW_CLASS);}
 421 const                        {c();return m(KW_CONST);}
 422 final                        {c();return m(KW_FINAL);}
 423 false                        {c();return m(KW_FALSE);}
 424 break                        {c();return m(KW_BREAK);}
 425 true                         {c();return m(KW_TRUE);}
 426 uint                         {c();return m(KW_UINT);}
 427 null                         {c();return m(KW_NULL);}
 428 else                         {c();return m(KW_ELSE);}
 429 use                          {c();return m(KW_USE);}
 430 int                          {c();return m(KW_INT);}
 431 new                          {c();return m(KW_NEW);}
 432 get                          {c();return m(KW_GET);}
 433 for                          {c();return m(KW_FOR);}
 434 set                          {c();return m(KW_SET);}
 435 var                          {c();return m(KW_VAR);}
 436 is                           {c();return m(KW_IS) ;}
 437 if                           {c();return m(KW_IF) ;}
 438 as                           {c();return m(KW_AS);}
 439 {NAME}                       {c();BEGIN(INITIAL);return mkid(T_IDENTIFIER);}
 440
 441 [+-\/*^~@$!%&\(=\[\]\{\}|?:;,<>] {c();BEGIN(REGEXPOK);return m(yytext[0]);}
 442 [\)\]]                            {c();BEGIN(INITIAL);return m(yytext[0]);}
 443
 444 .                            {char c1=yytext[0];
 445                               char buf[128];
 446                               buf[0] = yytext[0];
 447                               int t;
 448                               for(t=1;t<128;t++) {
 449                                   char c = buf[t]=input();
 450                                   if(c=='\n' || c==EOF)  {
 451                                       buf[t] = 0;
 452                                       break;
 453                                   }
 454                               }
 455                               if(c1>='0' && c1<='9')
 456                                   syntaxerror("syntax error: %s (identifiers must not start with a digit)");
 457                               else
 458                                   syntaxerror("syntax error: %s", buf);
 459                               printf("\n");
 460                               exit(1);
 461                               yyterminate();
 462                              }
 463 <<EOF>>                      {c();
 464                               void*b = leave_file();
 465                               if (!b) {
 466                                  yyterminate();
 467                                  yy_delete_buffer(YY_CURRENT_BUFFER);
 468                                  return m(T_EOF);
 469                               } else {
 470                                   yy_delete_buffer(YY_CURRENT_BUFFER);
 471                                   yy_switch_to_buffer(b);
 472                               }
 473                              }
 474
 475 %%
 476
 477 int yywrap()
 478 {
 479     return 1;
 480 }
 481
 482 static char mbuf[256];
 483 char*token2string(enum yytokentype nr, YYSTYPE v)
 484 {
 485     if(nr==T_STRING)     return "<string>";
 486     else if(nr==T_INT)     return "<int>";
 487     else if(nr==T_UINT)     return "<uint>";
 488     else if(nr==T_FLOAT)     return "<float>";
 489     else if(nr==T_REGEXP)     return "REGEXP";
 490     else if(nr==T_EOF)        return "***END***";
 491     else if(nr==T_GE)         return ">=";
 492     else if(nr==T_LE)         return "<=";
 493     else if(nr==T_MINUSMINUS) return "--";
 494     else if(nr==T_PLUSPLUS)   return "++";
 495     else if(nr==KW_IMPLEMENTS) return "implements";
 496     else if(nr==KW_INTERFACE)  return "interface";
 497     else if(nr==KW_NAMESPACE)  return "namespace";
 498     else if(nr==KW_PROTECTED)  return "protected";
 499     else if(nr==KW_OVERRIDE)   return "override";
 500     else if(nr==KW_INTERNAL)   return "internal";
 501     else if(nr==KW_FUNCTION)   return "function";
 502     else if(nr==KW_PACKAGE)    return "package";
 503     else if(nr==KW_PRIVATE)    return "private";
 504     else if(nr==KW_BOOLEAN)    return "Boolean";
 505     else if(nr==KW_DYNAMIC)    return "dynamic";
 506     else if(nr==KW_EXTENDS)    return "extends";
 507     else if(nr==KW_PUBLIC)     return "public";
 508     else if(nr==KW_NATIVE)     return "native";
 509     else if(nr==KW_STATIC)     return "static";
 510     else if(nr==KW_IMPORT)     return "import";
 511     else if(nr==KW_NUMBER)     return "number";
 512     else if(nr==KW_CLASS)      return "class";
 513     else if(nr==KW_CONST)      return "const";
 514     else if(nr==KW_FINAL)      return "final";
 515     else if(nr==KW_FALSE)      return "False";
 516     else if(nr==KW_TRUE)       return "True";
 517     else if(nr==KW_UINT)       return "uint";
 518     else if(nr==KW_NULL)       return "null";
 519     else if(nr==KW_ELSE)       return "else";
 520     else if(nr==KW_USE)        return "use";
 521     else if(nr==KW_INT)        return "int";
 522     else if(nr==KW_NEW)        return "new";
 523     else if(nr==KW_GET)        return "get";
 524     else if(nr==KW_FOR)        return "for";
 525     else if(nr==KW_SET)        return "set";
 526     else if(nr==KW_VAR)        return "var";
 527     else if(nr==KW_IS)         return "is";
 528     else if(nr==KW_AS)         return "as";
 529     else if(nr==T_IDENTIFIER)  return "ID";
 530     else {
 531         sprintf(mbuf, "%d", nr);
 532         return mbuf;
 533     }
 534 }
 535
 536 void initialize_scanner()
 537 {
 538     BEGIN(BEGINNING);
 539 }
 540