pidl/idl.yp

   1 ########################
   2 # IDL Parse::Yapp parser
   3 # Copyright (C) Andrew Tridgell <tridge@samba.org>
   4 # released under the GNU GPL version 3 or later
   5
   6
   7
   8 # the precedence actually doesn't matter at all for this grammar, but
   9 # by providing a precedence we reduce the number of conflicts
  10 # enormously
  11 %left   '-' '+' '&' '|' '*' '>' '.' '/' '(' ')' '[' ',' ';'
  12
  13
  14 ################
  15 # grammar
  16 %%
  17 idl:
  18         #empty  { {} }
  19         |
  20         idl interface { push(@{$_[1]}, $_[2]); $_[1] }
  21         |
  22         idl coclass   { push(@{$_[1]}, $_[2]); $_[1] }
  23         |
  24         idl import    { push(@{$_[1]}, $_[2]); $_[1] }
  25         |
  26         idl include   { push(@{$_[1]}, $_[2]); $_[1] }
  27         |
  28         idl importlib { push(@{$_[1]}, $_[2]); $_[1] }
  29         |
  30         idl cpp_quote { push(@{$_[1]}, $_[2]); $_[1] }
  31 ;
  32
  33 import:
  34         'import' commalist ';'
  35         {{
  36                 "TYPE" => "IMPORT",
  37                 "PATHS" => $_[2],
  38                 "FILE" => $_[0]->YYData->{FILE},
  39                 "LINE" => $_[0]->YYData->{LINE},
  40         }}
  41 ;
  42
  43 include:
  44         'include' commalist ';'
  45         {{
  46                 "TYPE" => "INCLUDE",
  47                 "PATHS" => $_[2],
  48                 "FILE" => $_[0]->YYData->{FILE},
  49                 "LINE" => $_[0]->YYData->{LINE},
  50         }}
  51 ;
  52
  53 importlib:
  54         'importlib' commalist ';'
  55         {{
  56                 "TYPE" => "IMPORTLIB",
  57                 "PATHS" => $_[2],
  58                 "FILE" => $_[0]->YYData->{FILE},
  59                 "LINE" => $_[0]->YYData->{LINE},
  60         }}
  61 ;
  62
  63 commalist:
  64         text { [ $_[1] ] }
  65         |
  66         commalist ',' text { push(@{$_[1]}, $_[3]); $_[1] }
  67 ;
  68
  69 coclass:
  70         property_list 'coclass' identifier '{' interface_names '}' optional_semicolon
  71         {{
  72                 "TYPE" => "COCLASS",
  73                 "PROPERTIES" => $_[1],
  74                 "NAME" => $_[3],
  75                 "DATA" => $_[5],
  76                 "FILE" => $_[0]->YYData->{FILE},
  77                 "LINE" => $_[0]->YYData->{LINE},
  78         }}
  79 ;
  80
  81 interface_names:
  82         #empty { {} }
  83         |
  84         interface_names 'interface' identifier ';' { push(@{$_[1]}, $_[2]); $_[1] }
  85 ;
  86
  87 interface:
  88         property_list 'interface' identifier base_interface '{' definitions '}' optional_semicolon
  89         {{
  90                 "TYPE" => "INTERFACE",
  91                 "PROPERTIES" => $_[1],
  92                 "NAME" => $_[3],
  93                 "BASE" => $_[4],
  94                 "DATA" => $_[6],
  95                 "FILE" => $_[0]->YYData->{FILE},
  96                 "LINE" => $_[0]->YYData->{LINE},
  97         }}
  98 ;
  99
 100 base_interface:
 101         #empty
 102         |
 103         ':' identifier { $_[2] }
 104 ;
 105
 106
 107 cpp_quote:
 108         'cpp_quote' '(' text ')'
 109         {{
 110                  "TYPE" => "CPP_QUOTE",
 111                  "DATA" => $_[3],
 112                  "FILE" => $_[0]->YYData->{FILE},
 113                  "LINE" => $_[0]->YYData->{LINE},
 114         }}
 115 ;
 116
 117 definitions:
 118         definition              { [ $_[1] ] }
 119         |
 120         definitions definition  { push(@{$_[1]}, $_[2]); $_[1] }
 121 ;
 122
 123 definition:
 124         function
 125         |
 126         const
 127         |
 128         typedef
 129         |
 130         typedecl
 131 ;
 132
 133 const:
 134         'const' identifier pointers identifier '=' anytext ';'
 135         {{
 136                 "TYPE"  => "CONST",
 137                 "DTYPE"  => $_[2],
 138                 "POINTERS" => $_[3],
 139                 "NAME"  => $_[4],
 140                 "VALUE" => $_[6],
 141                 "FILE" => $_[0]->YYData->{FILE},
 142                 "LINE" => $_[0]->YYData->{LINE},
 143         }}
 144         |
 145         'const' identifier pointers identifier array_len '=' anytext ';'
 146         {{
 147                 "TYPE"  => "CONST",
 148                 "DTYPE"  => $_[2],
 149                 "POINTERS" => $_[3],
 150                 "NAME"  => $_[4],
 151                 "ARRAY_LEN" => $_[5],
 152                 "VALUE" => $_[7],
 153                 "FILE" => $_[0]->YYData->{FILE},
 154                 "LINE" => $_[0]->YYData->{LINE},
 155         }}
 156 ;
 157
 158 function:
 159         property_list type identifier '(' element_list2 ')' ';'
 160         {{
 161                 "TYPE" => "FUNCTION",
 162                 "NAME" => $_[3],
 163                 "RETURN_TYPE" => $_[2],
 164                 "PROPERTIES" => $_[1],
 165                 "ELEMENTS" => $_[5],
 166                 "FILE" => $_[0]->YYData->{FILE},
 167                 "LINE" => $_[0]->YYData->{LINE},
 168         }}
 169 ;
 170
 171 typedef:
 172         property_list 'typedef' type pointers identifier array_len ';'
 173         {{
 174                 "TYPE" => "TYPEDEF",
 175                 "PROPERTIES" => $_[1],
 176                 "NAME" => $_[5],
 177                 "DATA" => $_[3],
 178                 "POINTERS" => $_[4],
 179                 "ARRAY_LEN" => $_[6],
 180                 "FILE" => $_[0]->YYData->{FILE},
 181                 "LINE" => $_[0]->YYData->{LINE},
 182         }}
 183 ;
 184
 185 usertype:
 186         struct
 187         |
 188         union
 189         |
 190         enum
 191         |
 192         bitmap
 193         |
 194         pipe
 195 ;
 196
 197 typedecl:
 198         usertype ';' { $_[1] }
 199 ;
 200
 201 sign:
 202         'signed'
 203         |
 204         'unsigned'
 205 ;
 206
 207 existingtype:
 208         sign identifier { ($_[1]?$_[1]:"signed") ." $_[2]" }
 209         |
 210         identifier
 211 ;
 212
 213 type:
 214         usertype
 215         |
 216         existingtype
 217         |
 218         void { "void" }
 219 ;
 220
 221 enum_body:
 222         '{' enum_elements '}' { $_[2] }
 223 ;
 224
 225 opt_enum_body:
 226         #empty
 227         |
 228         enum_body
 229 ;
 230
 231 enum:
 232         property_list 'enum' optional_identifier opt_enum_body
 233         {{
 234                 "TYPE" => "ENUM",
 235                 "PROPERTIES" => $_[1],
 236                 "NAME" => $_[3],
 237                 "ELEMENTS" => $_[4],
 238                 "FILE" => $_[0]->YYData->{FILE},
 239                 "LINE" => $_[0]->YYData->{LINE},
 240         }}
 241 ;
 242
 243 enum_elements:
 244         enum_element                    { [ $_[1] ] }
 245         |
 246         enum_elements ',' enum_element  { push(@{$_[1]}, $_[3]); $_[1] }
 247 ;
 248
 249 enum_element:
 250         identifier
 251         |
 252         identifier '=' anytext { "$_[1]$_[2]$_[3]" }
 253 ;
 254
 255 bitmap_body:
 256         '{' opt_bitmap_elements '}' { $_[2] }
 257 ;
 258
 259 opt_bitmap_body:
 260         #empty
 261         |
 262         bitmap_body
 263 ;
 264
 265 bitmap:
 266         property_list 'bitmap' optional_identifier opt_bitmap_body
 267         {{
 268                 "TYPE" => "BITMAP",
 269                 "PROPERTIES" => $_[1],
 270                 "NAME" => $_[3],
 271                 "ELEMENTS" => $_[4],
 272                 "FILE" => $_[0]->YYData->{FILE},
 273                 "LINE" => $_[0]->YYData->{LINE},
 274         }}
 275 ;
 276
 277 bitmap_elements:
 278         bitmap_element                      { [ $_[1] ] }
 279         |
 280         bitmap_elements ',' bitmap_element  { push(@{$_[1]}, $_[3]); $_[1] }
 281 ;
 282
 283 opt_bitmap_elements:
 284         #empty
 285         |
 286         bitmap_elements
 287 ;
 288
 289 bitmap_element:
 290         identifier '=' anytext { "$_[1] ( $_[3] )" }
 291 ;
 292
 293 struct_body:
 294         '{' element_list1 '}' { $_[2] }
 295 ;
 296
 297 opt_struct_body:
 298         #empty
 299         |
 300         struct_body
 301 ;
 302
 303 struct:
 304         property_list 'struct' optional_identifier opt_struct_body
 305         {{
 306                 "TYPE" => "STRUCT",
 307                 "PROPERTIES" => $_[1],
 308                 "NAME" => $_[3],
 309                 "ELEMENTS" => $_[4],
 310                 "FILE" => $_[0]->YYData->{FILE},
 311                 "LINE" => $_[0]->YYData->{LINE},
 312         }}
 313 ;
 314
 315 empty_element:
 316         property_list ';'
 317         {{
 318                 "NAME" => "",
 319                 "TYPE" => "EMPTY",
 320                 "PROPERTIES" => $_[1],
 321                 "POINTERS" => 0,
 322                 "ARRAY_LEN" => [],
 323                 "FILE" => $_[0]->YYData->{FILE},
 324                 "LINE" => $_[0]->YYData->{LINE},
 325         }}
 326 ;
 327
 328 base_or_empty:
 329         base_element ';'
 330         |
 331         empty_element;
 332
 333 optional_base_element:
 334         property_list base_or_empty { $_[2]->{PROPERTIES} = FlattenHash([$_[1],$_[2]->{PROPERTIES}]); $_[2] }
 335 ;
 336
 337 union_elements:
 338         #empty
 339         |
 340         union_elements optional_base_element { push(@{$_[1]}, $_[2]); $_[1] }
 341 ;
 342
 343 union_body:
 344         '{' union_elements '}' { $_[2] }
 345 ;
 346
 347 opt_union_body:
 348         #empty
 349         |
 350         union_body
 351 ;
 352
 353 union:
 354         property_list 'union' optional_identifier opt_union_body
 355         {{
 356                 "TYPE" => "UNION",
 357                 "PROPERTIES" => $_[1],
 358                 "NAME" => $_[3],
 359                 "ELEMENTS" => $_[4],
 360                 "FILE" => $_[0]->YYData->{FILE},
 361                 "LINE" => $_[0]->YYData->{LINE},
 362         }}
 363 ;
 364
 365 base_element:
 366         property_list type pointers identifier array_len
 367         {{
 368                 "NAME" => $_[4],
 369                 "TYPE" => $_[2],
 370                 "PROPERTIES" => $_[1],
 371                 "POINTERS" => $_[3],
 372                 "ARRAY_LEN" => $_[5],
 373                 "FILE" => $_[0]->YYData->{FILE},
 374                 "LINE" => $_[0]->YYData->{LINE},
 375         }}
 376 ;
 377
 378 pointers:
 379         #empty
 380         { 0 }
 381         |
 382         pointers '*'  { $_[1]+1 }
 383 ;
 384
 385 pipe:
 386         property_list 'pipe' type
 387         {{
 388                 "TYPE" => "PIPE",
 389                 "PROPERTIES" => $_[1],
 390                 "DATA" => $_[3],
 391                 "FILE" => $_[0]->YYData->{FILE},
 392                 "LINE" => $_[0]->YYData->{LINE},
 393         }}
 394 ;
 395
 396 element_list1:
 397         #empty
 398         { [] }
 399         |
 400         element_list1 base_element ';' { push(@{$_[1]}, $_[2]); $_[1] }
 401 ;
 402
 403 optional_const:
 404         #empty
 405         |
 406         'const'
 407 ;
 408
 409 element_list2:
 410         #empty
 411         |
 412         'void'
 413         |
 414         optional_const base_element { [ $_[2] ] }
 415         |
 416         element_list2 ',' optional_const base_element { push(@{$_[1]}, $_[4]); $_[1] }
 417 ;
 418
 419 array_len:
 420         #empty { [] }
 421         |
 422         '[' ']' array_len           { push(@{$_[3]}, "*"); $_[3] }
 423         |
 424         '[' anytext ']' array_len   { push(@{$_[4]}, "$_[2]"); $_[4] }
 425 ;
 426
 427 property_list:
 428         #empty
 429         |
 430         property_list '[' properties ']' { FlattenHash([$_[1],$_[3]]); }
 431 ;
 432
 433 properties:
 434         property                { $_[1] }
 435         |
 436         properties ',' property { FlattenHash([$_[1], $_[3]]); }
 437 ;
 438
 439 property:
 440         identifier                       {{ "$_[1]" => "1"     }}
 441         |
 442         identifier '(' commalisttext ')' {{ "$_[1]" => "$_[3]" }}
 443 ;
 444
 445 commalisttext:
 446         anytext
 447         |
 448         commalisttext ',' anytext { "$_[1],$_[3]" }
 449 ;
 450
 451 anytext:
 452         #empty
 453         { "" }
 454         |
 455         identifier
 456         |
 457         constant
 458         |
 459         text
 460         |
 461         anytext '-' anytext  { "$_[1]$_[2]$_[3]" }
 462         |
 463         anytext '.' anytext  { "$_[1]$_[2]$_[3]" }
 464         |
 465         anytext '*' anytext  { "$_[1]$_[2]$_[3]" }
 466         |
 467         anytext '>' anytext  { "$_[1]$_[2]$_[3]" }
 468         |
 469         anytext '<' anytext  { "$_[1]$_[2]$_[3]" }
 470         |
 471         anytext '|' anytext  { "$_[1]$_[2]$_[3]" }
 472         |
 473         anytext '&' anytext  { "$_[1]$_[2]$_[3]" }
 474         |
 475         anytext '/' anytext  { "$_[1]$_[2]$_[3]" }
 476         |
 477         anytext '?' anytext  { "$_[1]$_[2]$_[3]" }
 478         |
 479         anytext ':' anytext  { "$_[1]$_[2]$_[3]" }
 480         |
 481         anytext '=' anytext  { "$_[1]$_[2]$_[3]" }
 482         |
 483         anytext '+' anytext  { "$_[1]$_[2]$_[3]" }
 484         |
 485         anytext '~' anytext  { "$_[1]$_[2]$_[3]" }
 486         |
 487         anytext '(' commalisttext ')' anytext  { "$_[1]$_[2]$_[3]$_[4]$_[5]" }
 488         |
 489         anytext '{' commalisttext '}' anytext  { "$_[1]$_[2]$_[3]$_[4]$_[5]" }
 490 ;
 491
 492 identifier:
 493         IDENTIFIER
 494 ;
 495
 496 optional_identifier:
 497         #empty { undef }
 498         |
 499         IDENTIFIER
 500 ;
 501
 502 constant:
 503         CONSTANT
 504 ;
 505
 506 text:
 507         TEXT { "\"$_[1]\"" }
 508 ;
 509
 510 optional_semicolon:
 511         #empty
 512         |
 513         ';'
 514 ;
 515
 516
 517 #####################################
 518 # start code
 519 %%
 520
 521 use Parse::Pidl qw(error);
 522
 523 #####################################################################
 524 # flatten an array of hashes into a single hash
 525 sub FlattenHash($)
 526 {
 527         my $a = shift;
 528         my %b;
 529         for my $d (@{$a}) {
 530                 for my $k (keys %{$d}) {
 531                 $b{$k} = $d->{$k};
 532                 }
 533         }
 534         return \%b;
 535 }
 536
 537 #####################################################################
 538 # traverse a perl data structure removing any empty arrays or
 539 # hashes and any hash elements that map to undef
 540 sub CleanData($)
 541 {
 542         sub CleanData($);
 543         my($v) = shift;
 544
 545         return undef if (not defined($v));
 546
 547         if (ref($v) eq "ARRAY") {
 548                 foreach my $i (0 .. $#{$v}) {
 549                         CleanData($v->[$i]);
 550                 }
 551                 # this removes any undefined elements from the array
 552                 @{$v} = grep { defined $_ } @{$v};
 553         } elsif (ref($v) eq "HASH") {
 554                 foreach my $x (keys %{$v}) {
 555                         CleanData($v->{$x});
 556                         if (!defined $v->{$x}) {
 557                                 delete($v->{$x});
 558                                 next;
 559                         }
 560                 }
 561         }
 562
 563         return $v;
 564 }
 565
 566 sub _Error {
 567         if (exists $_[0]->YYData->{ERRMSG}) {
 568                 error($_[0]->YYData, $_[0]->YYData->{ERRMSG});
 569                 delete $_[0]->YYData->{ERRMSG};
 570                 return;
 571         }
 572
 573         my $last_token = $_[0]->YYData->{LAST_TOKEN};
 574
 575         error($_[0]->YYData, "Syntax error near '$last_token'");
 576 }
 577
 578 sub _Lexer($)
 579 {
 580         my($parser)=shift;
 581
 582         $parser->YYData->{INPUT} or return('',undef);
 583
 584 again:
 585         $parser->YYData->{INPUT} =~ s/^[ \t]*//;
 586
 587         for ($parser->YYData->{INPUT}) {
 588                 if (/^\#/) {
 589                         if (s/^\# (\d+) \"(.*?)\"( \d+|)//) {
 590                                 $parser->YYData->{LINE} = $1-1;
 591                                 $parser->YYData->{FILE} = $2;
 592                                 goto again;
 593                         }
 594                         if (s/^\#line (\d+) \"(.*?)\"( \d+|)//) {
 595                                 $parser->YYData->{LINE} = $1-1;
 596                                 $parser->YYData->{FILE} = $2;
 597                                 goto again;
 598                         }
 599                         if (s/^(\#.*)$//m) {
 600                                 goto again;
 601                         }
 602                 }
 603                 if (s/^(\n)//) {
 604                         $parser->YYData->{LINE}++;
 605                         goto again;
 606                 }
 607                 if (s/^\"(.*?)\"//) {
 608                         $parser->YYData->{LAST_TOKEN} = $1;
 609                         return('TEXT',$1);
 610                 }
 611                 if (s/^(\d+)(\W|$)/$2/) {
 612                         $parser->YYData->{LAST_TOKEN} = $1;
 613                         return('CONSTANT',$1);
 614                 }
 615                 if (s/^([\w_]+)//) {
 616                         $parser->YYData->{LAST_TOKEN} = $1;
 617                         if ($1 =~
 618                             /^(coclass|interface|import|importlib
 619                               |include|cpp_quote|typedef
 620                               |union|struct|enum|bitmap|pipe
 621                               |void|const|unsigned|signed)$/x) {
 622                                 return $1;
 623                         }
 624                         return('IDENTIFIER',$1);
 625                 }
 626                 if (s/^(.)//s) {
 627                         $parser->YYData->{LAST_TOKEN} = $1;
 628                         return($1,$1);
 629                 }
 630         }
 631 }
 632
 633 sub parse_string
 634 {
 635         my ($data,$filename) = @_;
 636
 637         my $self = new Parse::Pidl::IDL;
 638
 639         $self->YYData->{FILE} = $filename;
 640         $self->YYData->{INPUT} = $data;
 641         $self->YYData->{LINE} = 0;
 642         $self->YYData->{LAST_TOKEN} = "NONE";
 643
 644         my $idl = $self->YYParse( yylex => \&_Lexer, yyerror => \&_Error );
 645
 646         return CleanData($idl);
 647 }
 648
 649 sub parse_file($$)
 650 {
 651         my ($filename,$incdirs) = @_;
 652
 653         my $saved_delim = $/;
 654         undef $/;
 655         my $cpp = $ENV{CPP};
 656         my $options = "";
 657         if (! defined $cpp) {
 658                 if (defined $ENV{CC}) {
 659                         $cpp = "$ENV{CC}";
 660                         $options = "-E";
 661                 } else {
 662                         $cpp = "cpp";
 663                 }
 664         }
 665         my $includes = join('',map { " -I$_" } @$incdirs);
 666         my $data = `$cpp $options -D__PIDL__$includes -xc "$filename"`;
 667         $/ = $saved_delim;
 668
 669         return parse_string($data, $filename);
 670 }