src/mesa/shader/slang/library/slang_shader.syn

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 2004-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /*
  26  * \file slang_shader.syn
  27  * slang vertex/fragment shader syntax
  28  * \author Michal Krol
  29  */
  30
  31 /*
  32  * usage:
  33  *   syn2c slang_shader.syn > slang_shader_syn.h
  34  *
  35  * when modifying or extending this file, several things must be taken into consideration:
  36  * - when adding new operators that were marked as reserved in the initial specification,
  37  *   one must only uncomment particular lines of code that refer to operators being added;
  38  * - when adding new shader target, one must reserve new value for shader_type register and
  39  *   use it in .if constructs for symbols that are exclusive for that shader;
  40  * - some symbols mimic output of other symbols - the best example is the "for" construct:
  41  *   expression "for (foo(); ; bar())" is seen as "for (foo(); true; bar())" by the output
  42  *   processor - hence, special care must be taken when rearranging output of essential symbols;
  43  * - order of single-quoted tokens does matter in alternatives - so do not parse "<" operator
  44  *   before "<<" and "<<" before "<<=";
  45  * - all double-quoted tokens are internally preprocessed to eliminate problems with parsing
  46  *   strings that are prefixes of other strings, like "sampler1D" and "sampler1DShadow";
  47  */
  48
  49 .syntax translation_unit;
  50
  51 /* revision number - increment after each change affecting emitted output */
  52 .emtcode REVISION                                   3
  53
  54 /* external declaration */
  55 .emtcode EXTERNAL_NULL                              0
  56 .emtcode EXTERNAL_FUNCTION_DEFINITION               1
  57 .emtcode EXTERNAL_DECLARATION                       2
  58
  59 /* declaration */
  60 .emtcode DECLARATION_FUNCTION_PROTOTYPE             1
  61 .emtcode DECLARATION_INIT_DECLARATOR_LIST           2
  62
  63 /* function type */
  64 .emtcode FUNCTION_ORDINARY                          0
  65 .emtcode FUNCTION_CONSTRUCTOR                       1
  66 .emtcode FUNCTION_OPERATOR                          2
  67
  68 /* operator type */
  69 .emtcode OPERATOR_ADDASSIGN                         1
  70 .emtcode OPERATOR_SUBASSIGN                         2
  71 .emtcode OPERATOR_MULASSIGN                         3
  72 .emtcode OPERATOR_DIVASSIGN                         4
  73 /*.emtcode OPERATOR_MODASSIGN                         5*/
  74 /*.emtcode OPERATOR_LSHASSIGN                         6*/
  75 /*.emtcode OPERATOR_RSHASSIGN                         7*/
  76 /*.emtcode OPERATOR_ORASSIGN                          8*/
  77 /*.emtcode OPERATOR_XORASSIGN                         9*/
  78 /*.emtcode OPERATOR_ANDASSIGN                         10*/
  79 .emtcode OPERATOR_LOGICALXOR                        11
  80 /*.emtcode OPERATOR_BITOR                             12*/
  81 /*.emtcode OPERATOR_BITXOR                            13*/
  82 /*.emtcode OPERATOR_BITAND                            14*/
  83 .emtcode OPERATOR_LESS                              15
  84 .emtcode OPERATOR_GREATER                           16
  85 .emtcode OPERATOR_LESSEQUAL                         17
  86 .emtcode OPERATOR_GREATEREQUAL                      18
  87 /*.emtcode OPERATOR_LSHIFT                            19*/
  88 /*.emtcode OPERATOR_RSHIFT                            20*/
  89 .emtcode OPERATOR_MULTIPLY                          21
  90 .emtcode OPERATOR_DIVIDE                            22
  91 /*.emtcode OPERATOR_MODULUS                           23*/
  92 .emtcode OPERATOR_INCREMENT                         24
  93 .emtcode OPERATOR_DECREMENT                         25
  94 .emtcode OPERATOR_PLUS                              26
  95 .emtcode OPERATOR_MINUS                             27
  96 /*.emtcode OPERATOR_COMPLEMENT                        28*/
  97 .emtcode OPERATOR_NOT                               29
  98
  99 /* init declarator list */
 100 .emtcode DECLARATOR_NONE                            0
 101 .emtcode DECLARATOR_NEXT                            1
 102
 103 /* variable declaration */
 104 .emtcode VARIABLE_NONE                              0
 105 .emtcode VARIABLE_IDENTIFIER                        1
 106 .emtcode VARIABLE_INITIALIZER                       2
 107 .emtcode VARIABLE_ARRAY_EXPLICIT                    3
 108 .emtcode VARIABLE_ARRAY_UNKNOWN                     4
 109
 110 /* type qualifier */
 111 .emtcode TYPE_QUALIFIER_NONE                        0
 112 .emtcode TYPE_QUALIFIER_CONST                       1
 113 .emtcode TYPE_QUALIFIER_ATTRIBUTE                   2
 114 .emtcode TYPE_QUALIFIER_VARYING                     3
 115 .emtcode TYPE_QUALIFIER_UNIFORM                     4
 116 .emtcode TYPE_QUALIFIER_FIXEDOUTPUT                 5
 117 .emtcode TYPE_QUALIFIER_FIXEDINPUT                  6
 118
 119 /* type specifier */
 120 .emtcode TYPE_SPECIFIER_VOID                        0
 121 .emtcode TYPE_SPECIFIER_BOOL                        1
 122 .emtcode TYPE_SPECIFIER_BVEC2                       2
 123 .emtcode TYPE_SPECIFIER_BVEC3                       3
 124 .emtcode TYPE_SPECIFIER_BVEC4                       4
 125 .emtcode TYPE_SPECIFIER_INT                         5
 126 .emtcode TYPE_SPECIFIER_IVEC2                       6
 127 .emtcode TYPE_SPECIFIER_IVEC3                       7
 128 .emtcode TYPE_SPECIFIER_IVEC4                       8
 129 .emtcode TYPE_SPECIFIER_FLOAT                       9
 130 .emtcode TYPE_SPECIFIER_VEC2                        10
 131 .emtcode TYPE_SPECIFIER_VEC3                        11
 132 .emtcode TYPE_SPECIFIER_VEC4                        12
 133 .emtcode TYPE_SPECIFIER_MAT2                        13
 134 .emtcode TYPE_SPECIFIER_MAT3                        14
 135 .emtcode TYPE_SPECIFIER_MAT4                        15
 136 .emtcode TYPE_SPECIFIER_SAMPLER1D                   16
 137 .emtcode TYPE_SPECIFIER_SAMPLER2D                   17
 138 .emtcode TYPE_SPECIFIER_SAMPLER3D                   18
 139 .emtcode TYPE_SPECIFIER_SAMPLERCUBE                 19
 140 .emtcode TYPE_SPECIFIER_SAMPLER1DSHADOW             20
 141 .emtcode TYPE_SPECIFIER_SAMPLER2DSHADOW             21
 142 .emtcode TYPE_SPECIFIER_STRUCT                      22
 143 .emtcode TYPE_SPECIFIER_TYPENAME                    23
 144
 145 /* structure field */
 146 .emtcode FIELD_NONE                                 0
 147 .emtcode FIELD_NEXT                                 1
 148 .emtcode FIELD_ARRAY                                2
 149
 150 /* operation */
 151 .emtcode OP_END                                     0
 152 .emtcode OP_BLOCK_BEGIN_NO_NEW_SCOPE                1
 153 .emtcode OP_BLOCK_BEGIN_NEW_SCOPE                   2
 154 .emtcode OP_DECLARE                                 3
 155 .emtcode OP_ASM                                     4
 156 .emtcode OP_BREAK                                   5
 157 .emtcode OP_CONTINUE                                6
 158 .emtcode OP_DISCARD                                 7
 159 .emtcode OP_RETURN                                  8
 160 .emtcode OP_EXPRESSION                              9
 161 .emtcode OP_IF                                      10
 162 .emtcode OP_WHILE                                   11
 163 .emtcode OP_DO                                      12
 164 .emtcode OP_FOR                                     13
 165 .emtcode OP_PUSH_VOID                               14
 166 .emtcode OP_PUSH_BOOL                               15
 167 .emtcode OP_PUSH_INT                                16
 168 .emtcode OP_PUSH_FLOAT                              17
 169 .emtcode OP_PUSH_IDENTIFIER                         18
 170 .emtcode OP_SEQUENCE                                19
 171 .emtcode OP_ASSIGN                                  20
 172 .emtcode OP_ADDASSIGN                               21
 173 .emtcode OP_SUBASSIGN                               22
 174 .emtcode OP_MULASSIGN                               23
 175 .emtcode OP_DIVASSIGN                               24
 176 /*.emtcode OP_MODASSIGN                               25*/
 177 /*.emtcode OP_LSHASSIGN                               26*/
 178 /*.emtcode OP_RSHASSIGN                               27*/
 179 /*.emtcode OP_ORASSIGN                                28*/
 180 /*.emtcode OP_XORASSIGN                               29*/
 181 /*.emtcode OP_ANDASSIGN                               30*/
 182 .emtcode OP_SELECT                                  31
 183 .emtcode OP_LOGICALOR                               32
 184 .emtcode OP_LOGICALXOR                              33
 185 .emtcode OP_LOGICALAND                              34
 186 /*.emtcode OP_BITOR                                   35*/
 187 /*.emtcode OP_BITXOR                                  36*/
 188 /*.emtcode OP_BITAND                                  37*/
 189 .emtcode OP_EQUAL                                   38
 190 .emtcode OP_NOTEQUAL                                39
 191 .emtcode OP_LESS                                    40
 192 .emtcode OP_GREATER                                 41
 193 .emtcode OP_LESSEQUAL                               42
 194 .emtcode OP_GREATEREQUAL                            43
 195 /*.emtcode OP_LSHIFT                                  44*/
 196 /*.emtcode OP_RSHIFT                                  45*/
 197 .emtcode OP_ADD                                     46
 198 .emtcode OP_SUBTRACT                                47
 199 .emtcode OP_MULTIPLY                                48
 200 .emtcode OP_DIVIDE                                  49
 201 /*.emtcode OP_MODULUS                                 50*/
 202 .emtcode OP_PREINCREMENT                            51
 203 .emtcode OP_PREDECREMENT                            52
 204 .emtcode OP_PLUS                                    53
 205 .emtcode OP_MINUS                                   54
 206 /*.emtcode OP_COMPLEMENT                              55*/
 207 .emtcode OP_NOT                                     56
 208 .emtcode OP_SUBSCRIPT                               57
 209 .emtcode OP_CALL                                    58
 210 .emtcode OP_FIELD                                   59
 211 .emtcode OP_POSTINCREMENT                           60
 212 .emtcode OP_POSTDECREMENT                           61
 213
 214 /* parameter qualifier */
 215 .emtcode PARAM_QUALIFIER_IN                         0
 216 .emtcode PARAM_QUALIFIER_OUT                        1
 217 .emtcode PARAM_QUALIFIER_INOUT                      2
 218
 219 /* function parameter */
 220 .emtcode PARAMETER_NONE                             0
 221 .emtcode PARAMETER_NEXT                             1
 222
 223 /* function parameter array presence */
 224 .emtcode PARAMETER_ARRAY_NOT_PRESENT                0
 225 .emtcode PARAMETER_ARRAY_PRESENT                    1
 226
 227 .errtext INVALID_EXTERNAL_DECLARATION               "2001: Invalid external declaration."
 228 .errtext INVALID_OPERATOR_OVERRIDE                  "2002: Invalid operator override."
 229 .errtext LBRACE_EXPECTED                            "2003: '{' expected but '$err_token$' found."
 230 .errtext LPAREN_EXPECTED                            "2004: '(' expected but '$err_token$' found."
 231 .errtext RPAREN_EXPECTED                            "2005: ')' expected but '$err_token$' found."
 232
 233 /* tells whether the shader that is being parsed is a built-in shader or not */
 234 /*   0 - normal behaviour */
 235 /*   1 - accepts constructor and operator definitions and __asm statements */
 236 /* the implementation will set it to 1 when compiling internal built-in shaders */
 237 .regbyte parsing_builtin                            0
 238
 239 /* holds the type of the shader being parsed; possible values are listed below */
 240 /*   FRAGMENT_SHADER            1 */
 241 /*   VERTEX_SHADER              2 */
 242 /* shader type is set by the caller before parsing */
 243 .regbyte shader_type                                0
 244
 245 /*
 246     <variable_identifier>               ::= <identifier>
 247 */
 248 variable_identifier
 249     identifier .emit OP_PUSH_IDENTIFIER;
 250
 251 /*
 252     <primary_expression>                ::= <variable_identifier>
 253                                           | <intconstant>
 254                                           | <floatconstant>
 255                                           | <boolconstant>
 256                                           | "(" <expression> ")"
 257 */
 258 primary_expression
 259     floatconstant .or boolconstant .or intconstant .or variable_identifier .or primary_expression_1;
 260 primary_expression_1
 261     lparen .and expression .and rparen;
 262
 263 /*
 264     <postfix_expression>                ::= <primary_expression>
 265                                           | <postfix_expression> "[" <integer_expression> "]"
 266                                           | <function_call>
 267                                           | <postfix_expression> "." <field_selection>
 268                                           | <postfix_expression> "++"
 269                                           | <postfix_expression> "--"
 270 */
 271 postfix_expression
 272     postfix_expression_1 .and .loop postfix_expression_2;
 273 postfix_expression_1
 274     function_call .or primary_expression;
 275 postfix_expression_2
 276     postfix_expression_3 .or postfix_expression_4 .or
 277     plusplus .emit OP_POSTINCREMENT .or
 278     minusminus .emit OP_POSTDECREMENT;
 279 postfix_expression_3
 280     lbracket .and integer_expression .and rbracket .emit OP_SUBSCRIPT;
 281 postfix_expression_4
 282     dot .and field_selection .emit OP_FIELD;
 283
 284 /*
 285     <integer_expression>                ::= <expression>
 286 */
 287 integer_expression
 288     expression;
 289
 290 /*
 291     <function_call>                     ::= <function_call_generic>
 292 */
 293 function_call
 294     function_call_generic .emit OP_CALL .and .true .emit OP_END;
 295
 296 /*
 297     <function_call_generic>             ::= <function_call_header_with_parameters> ")"
 298                                           | <function_call_header_no_parameters> ")"
 299 */
 300 function_call_generic
 301     function_call_generic_1 .or function_call_generic_2;
 302 function_call_generic_1
 303     function_call_header_with_parameters .and rparen .error RPAREN_EXPECTED;
 304 function_call_generic_2
 305     function_call_header_no_parameters .and rparen .error RPAREN_EXPECTED;
 306
 307 /*
 308     <function_call_header_no_parameters>::= <function_call_header> "void"
 309                                           | <function_call_header>
 310 */
 311 function_call_header_no_parameters
 312     function_call_header .and function_call_header_no_parameters_1;
 313 function_call_header_no_parameters_1
 314     "void" .or .true;
 315
 316 /*
 317     <function_call_header_with_parameters>::= <function_call_header> <assignment_expression>
 318                                             | <function_call_header_with_parameters> ","
 319                                               <assignment_expression>
 320 */
 321 function_call_header_with_parameters
 322     function_call_header .and assignment_expression .and .true .emit OP_END .and
 323     .loop function_call_header_with_parameters_1;
 324 function_call_header_with_parameters_1
 325     comma .and assignment_expression .and .true .emit OP_END;
 326
 327 /*
 328     <function_call_header>              ::= <function_identifier> "("
 329 */
 330 function_call_header
 331     function_identifier .and lparen;
 332
 333 /*
 334     <function_identifier>               ::= <constructor_identifier>
 335                                           | <identifier>
 336
 337 note: <constructor_identifier> has been deleted
 338 */
 339 function_identifier
 340     identifier;
 341
 342 /*
 343     <unary_expression>                  ::= <postfix_expression>
 344                                           | "++" <unary_expression>
 345                                           | "--" <unary_expression>
 346                                           | <unary_operator> <unary_expression>
 347
 348     <unary_operator>                    ::= "+"
 349                                           | "-"
 350                                           | "!"
 351                                           | "~" // reserved
 352 */
 353 unary_expression
 354     postfix_expression .or unary_expression_1 .or unary_expression_2 .or unary_expression_3 .or
 355     unary_expression_4 .or unary_expression_5/* .or unary_expression_6*/;
 356 unary_expression_1
 357     plusplus .and unary_expression .and .true .emit OP_PREINCREMENT;
 358 unary_expression_2
 359     minusminus .and unary_expression .and .true .emit OP_PREDECREMENT;
 360 unary_expression_3
 361     plus .and unary_expression .and .true .emit OP_PLUS;
 362 unary_expression_4
 363     minus .and unary_expression .and .true .emit OP_MINUS;
 364 unary_expression_5
 365     bang .and unary_expression .and .true .emit OP_NOT;
 366 /*unary_expression_6
 367     tilde .and unary_expression .and .true .emit OP_COMPLEMENT;*/
 368
 369 /*
 370     <multiplicative_expression>         ::= <unary_expression>
 371                                           | <multiplicative_expression> "*" <unary_expression>
 372                                           | <multiplicative_expression> "/" <unary_expression>
 373                                           | <multiplicative_expression> "%" <unary_expression> // reserved
 374 */
 375 multiplicative_expression
 376     unary_expression .and .loop multiplicative_expression_1;
 377 multiplicative_expression_1
 378     multiplicative_expression_2 .or multiplicative_expression_3/* .or multiplicative_expression_4*/;
 379 multiplicative_expression_2
 380     star .and unary_expression .and .true .emit OP_MULTIPLY;
 381 multiplicative_expression_3
 382     slash .and unary_expression .and .true .emit OP_DIVIDE;
 383 /*multiplicative_expression_4
 384     percent .and unary_expression .and .true .emit OP_MODULUS;*/
 385
 386 /*
 387     <additive_expression>               ::= <multiplicative_expression>
 388                                           | <additive_expression> "+" <multiplicative_expression>
 389                                           | <additive_expression> "-" <multiplicative_expression>
 390 */
 391 additive_expression
 392     multiplicative_expression .and .loop additive_expression_1;
 393 additive_expression_1
 394     additive_expression_2 .or additive_expression_3;
 395 additive_expression_2
 396     plus .and multiplicative_expression .and .true .emit OP_ADD;
 397 additive_expression_3
 398     minus .and multiplicative_expression .and .true .emit OP_SUBTRACT;
 399
 400 /*
 401     <shift_expression>                  ::= <additive_expression>
 402                                           | <shift_expression> "<<" <additive_expression> // reserved
 403                                           | <shift_expression> ">>" <additive_expression> // reserved
 404 */
 405 shift_expression
 406     additive_expression/* .and .loop shift_expression_1*/;
 407 /*shift_expression_1
 408     shift_expression_2 .or shift_expression_3;*/
 409 /*shift_expression_2
 410     lessless .and additive_expression .and .true .emit OP_LSHIFT;*/
 411 /*shift_expression_3
 412     greatergreater .and additive_expression .and .true .emit OP_RSHIFT;*/
 413
 414 /*
 415     <relational_expression>             ::= <shift_expression>
 416                                           | <relational_expression> "<" <shift_expression>
 417                                           | <relational_expression> ">" <shift_expression>
 418                                           | <relational_expression> "<=" <shift_expression>
 419                                           | <relational_expression> ">=" <shift_expression>
 420 */
 421 relational_expression
 422     shift_expression .and .loop relational_expression_1;
 423 relational_expression_1
 424     relational_expression_2 .or relational_expression_3 .or relational_expression_4 .or
 425     relational_expression_5;
 426 relational_expression_2
 427     lessequals .and shift_expression .and .true .emit OP_LESSEQUAL;
 428 relational_expression_3
 429     greaterequals .and shift_expression .and .true .emit OP_GREATEREQUAL;
 430 relational_expression_4
 431     less .and shift_expression .and .true .emit OP_LESS;
 432 relational_expression_5
 433     greater .and shift_expression .and .true .emit OP_GREATER;
 434
 435 /*
 436     <equality_expression>               ::= <relational_expression>
 437                                           | <equality_expression> "==" <relational_expression>
 438                                           | <equality_expression> "!=" <relational_expression>
 439 */
 440 equality_expression
 441     relational_expression .and .loop equality_expression_1;
 442 equality_expression_1
 443     equality_expression_2 .or equality_expression_3;
 444 equality_expression_2
 445     equalsequals .and relational_expression .and .true .emit OP_EQUAL;
 446 equality_expression_3
 447     bangequals .and relational_expression .and .true .emit OP_NOTEQUAL;
 448
 449 /*
 450     <and_expression>                    ::= <equality_expression>
 451                                           | <and_expression> "&" <equality_expression> // reserved
 452 */
 453 and_expression
 454     equality_expression/* .and .loop and_expression_1*/;
 455 /*and_expression_1
 456     ampersand .and equality_expression .and .true .emit OP_BITAND;*/
 457
 458 /*
 459     <exclusive_or_expression>           ::= <and_expression>
 460                                           | <exclusive_or_expression> "^" <and_expression> // reserved
 461 */
 462 exclusive_or_expression
 463     and_expression/* .and .loop exclusive_or_expression_1*/;
 464 /*exclusive_or_expression_1
 465     caret .and and_expression .and .true .emit OP_BITXOR;*/
 466
 467 /*
 468     <inclusive_or_expression>           ::= <exclusive_or_expression>
 469                                           | <inclusive_or_expression> "|" <exclusive_or_expression> // reserved
 470 */
 471 inclusive_or_expression
 472     exclusive_or_expression/* .and .loop inclusive_or_expression_1*/;
 473 /*inclusive_or_expression_1
 474     bar .and exclusive_or_expression .and .true .emit OP_BITOR;*/
 475
 476 /*
 477     <logical_and_expression>            ::= <inclusive_or_expression>
 478                                           | <logical_and_expression> "&&" <inclusive_or_expression>
 479 */
 480 logical_and_expression
 481     inclusive_or_expression .and .loop logical_and_expression_1;
 482 logical_and_expression_1
 483     ampersandampersand .and inclusive_or_expression .and .true .emit OP_LOGICALAND;
 484
 485 /*
 486     <logical_xor_expression>            ::= <logical_and_expression>
 487                                           | <logical_xor_expression> "^^" <logical_and_expression>
 488 */
 489 logical_xor_expression
 490     logical_and_expression .and .loop logical_xor_expression_1;
 491 logical_xor_expression_1
 492     caretcaret .and logical_and_expression .and .true .emit OP_LOGICALXOR;
 493
 494 /*
 495     <logical_or_expression>             ::= <logical_xor_expression>
 496                                           | <logical_or_expression> "||" <logical_xor_expression>
 497 */
 498 logical_or_expression
 499     logical_xor_expression .and .loop logical_or_expression_1;
 500 logical_or_expression_1
 501     barbar .and logical_xor_expression .and .true .emit OP_LOGICALOR;
 502
 503 /*
 504     <conditional_expression>            ::= <logical_or_expression>
 505                                           | <logical_or_expression> "?" <expression> ":"
 506                                             <conditional_expression>
 507 */
 508 conditional_expression
 509     logical_or_expression .and .loop conditional_expression_1;
 510 conditional_expression_1
 511     question .and expression .and colon .and conditional_expression .and .true .emit OP_SELECT;
 512
 513 /*
 514     <assignment_expression>             ::= <conditional_expression>
 515                                           | <unary_expression> <assignment_operator>
 516                                             <assignment_expression>
 517
 518     <assignment_operator>               ::= "="
 519                                           | "*="
 520                                           | "/="
 521                                           | "+="
 522                                           | "-="
 523                                           | "%=" // reserved
 524                                           | "<<=" // reserved
 525                                           | ">>=" // reserved
 526                                           | "&=" // reserved
 527                                           | "^=" // reserved
 528                                           | "|=" // reserved
 529 */
 530 assignment_expression
 531     assignment_expression_1 .or assignment_expression_2 .or assignment_expression_3 .or
 532     assignment_expression_4 .or assignment_expression_5/* .or assignment_expression_6 .or
 533     assignment_expression_7 .or assignment_expression_8 .or assignment_expression_9 .or
 534     assignment_expression_10 .or assignment_expression_11*/ .or conditional_expression;
 535 assignment_expression_1
 536     unary_expression .and equals .and assignment_expression .and .true .emit OP_ASSIGN;
 537 assignment_expression_2
 538     unary_expression .and starequals .and assignment_expression .and .true .emit OP_MULASSIGN;
 539 assignment_expression_3
 540     unary_expression .and slashequals .and assignment_expression .and .true .emit OP_DIVASSIGN;
 541 assignment_expression_4
 542     unary_expression .and plusequals .and assignment_expression .and .true .emit OP_ADDASSIGN;
 543 assignment_expression_5
 544     unary_expression .and minusequals .and assignment_expression .and .true .emit OP_SUBASSIGN;
 545 /*assignment_expression_6
 546     unary_expression .and percentequals .and assignment_expression .and .true .emit OP_MODASSIGN;*/
 547 /*assignment_expression_7
 548     unary_expression .and lesslessequals .and assignment_expression .and .true .emit OP_LSHASSIGN;*/
 549 /*assignment_expression_8
 550     unary_expression .and greatergreaterequals .and assignment_expression .and
 551     .true .emit OP_RSHASSIGN;*/
 552 /*assignment_expression_9
 553     unary_expression .and ampersandequals .and assignment_expression .and .true .emit OP_ANDASSIGN;*/
 554 /*assignment_expression_10
 555     unary_expression .and caretequals .and assignment_expression .and .true .emit OP_XORASSIGN;*/
 556 /*assignment_expression_11
 557     unary_expression .and barequals .and assignment_expression .and .true .emit OP_ORASSIGN;*/
 558
 559 /*
 560     <expression>                        ::= <assignment_expression>
 561                                           | <expression> "," <assignment_expression>
 562 */
 563 expression
 564     assignment_expression .and .loop expression_1;
 565 expression_1
 566     comma .and assignment_expression .and .true .emit OP_SEQUENCE;
 567
 568 /*
 569     <constant_expression>               ::= <conditional_expression>
 570 */
 571 constant_expression
 572     conditional_expression .and .true .emit OP_END;
 573
 574 /*
 575     <declaration>                       ::= <function_prototype> ";"
 576                                           | <init_declarator_list> ";"
 577 */
 578 declaration
 579     declaration_1 .or declaration_2;
 580 declaration_1
 581     function_prototype .emit DECLARATION_FUNCTION_PROTOTYPE .and semicolon;
 582 declaration_2
 583     init_declarator_list .emit DECLARATION_INIT_DECLARATOR_LIST .and semicolon;
 584
 585 /*
 586     <function_prototype>                ::= <function_header> "void" ")"
 587                                           | <function_declarator> ")"
 588 */
 589 function_prototype
 590     function_prototype_1 .or function_prototype_2;
 591 function_prototype_1
 592     function_header .and "void" .and rparen .error RPAREN_EXPECTED .emit PARAMETER_NONE;
 593 function_prototype_2
 594     function_declarator .and rparen .error RPAREN_EXPECTED .emit PARAMETER_NONE;
 595
 596 /*
 597     <function_declarator>               ::= <function_header>
 598                                           | <function_header_with_parameters>
 599 */
 600 function_declarator
 601     function_header_with_parameters .or function_header;
 602
 603 /*
 604     <function_header_with_parameters>   ::= <function_header> <parameter_declaration>
 605                                           | <function_header_with_parameters> ","
 606                                             <parameter_declaration>
 607 */
 608 function_header_with_parameters
 609     function_header .and parameter_declaration .and .loop function_header_with_parameters_1;
 610 function_header_with_parameters_1
 611     comma .and parameter_declaration;
 612
 613 /*
 614     <function_header>                   ::= <fully_specified_type> <identifier> "("
 615 */
 616 function_header
 617     function_header_nospace .or function_header_space;
 618 function_header_space
 619     fully_specified_type_space .and space .and function_decl_identifier .and lparen;
 620 function_header_nospace
 621     fully_specified_type_nospace .and function_decl_identifier .and lparen;
 622
 623 /*
 624     <function_decl_identifier>          ::= "__constructor"
 625                                           | <__operator>
 626                                           | <identifier>
 627
 628 note: this is an extension to the standard language specification - normally slang disallows
 629       operator and constructor prototypes and definitions
 630 */
 631 function_decl_identifier
 632     .if (parsing_builtin != 0) __operator .emit FUNCTION_OPERATOR .or
 633     .if (parsing_builtin != 0) "__constructor" .emit FUNCTION_CONSTRUCTOR .or
 634     identifier .emit FUNCTION_ORDINARY;
 635
 636 /*
 637     <__operator>                        ::= "__operator" <overriden_op>
 638
 639 note: this is an extension to the standard language specification - normally slang disallows
 640       operator prototypes and definitions
 641 */
 642 __operator
 643     "__operator" .and overriden_operator .error INVALID_OPERATOR_OVERRIDE;
 644
 645 /*
 646     <overriden_op>                      ::= "="
 647                                           | "+="
 648                                           | "-="
 649                                           | "*="
 650                                           | "/="
 651                                           | "%=" // reserved
 652                                           | "<<=" // reserved
 653                                           | ">>=" // reserved
 654                                           | "&=" // reserved
 655                                           | "^=" // reserved
 656                                           | "|=" // reserved
 657                                           | "^^"
 658                                           | "|" // reserved
 659                                           | "^" // reserved
 660                                           | "&" // reserved
 661                                           | "=="
 662                                           | "!="
 663                                           | "<"
 664                                           | ">"
 665                                           | "<="
 666                                           | ">="
 667                                           | "<<" // reserved
 668                                           | ">>" // reserved
 669                                           | "*"
 670                                           | "/"
 671                                           | "%" // reserved
 672                                           | "++"
 673                                           | "--"
 674                                           | "+"
 675                                           | "-"
 676                                           | "~" // reserved
 677                                           | "!"
 678
 679 note: this is an extension to the standard language specification - normally slang disallows
 680       operator prototypes and definitions
 681 */
 682 overriden_operator
 683     plusplus .emit OPERATOR_INCREMENT .or
 684     plusequals .emit OPERATOR_ADDASSIGN .or
 685     plus .emit OPERATOR_PLUS .or
 686     minusminus .emit OPERATOR_DECREMENT .or
 687     minusequals .emit OPERATOR_SUBASSIGN .or
 688     minus .emit OPERATOR_MINUS .or
 689     bang .emit OPERATOR_NOT .or
 690     starequals .emit OPERATOR_MULASSIGN .or
 691     star .emit OPERATOR_MULTIPLY .or
 692     slashequals .emit OPERATOR_DIVASSIGN .or
 693     slash .emit OPERATOR_DIVIDE .or
 694     lessequals .emit OPERATOR_LESSEQUAL .or
 695     /*lesslessequals .emit OPERATOR_LSHASSIGN .or*/
 696     /*lessless .emit OPERATOR_LSHIFT .or*/
 697     less .emit OPERATOR_LESS .or
 698     greaterequals .emit OPERATOR_GREATEREQUAL .or
 699     /*greatergreaterequals .emit OPERATOR_RSHASSIGN .or*/
 700     /*greatergreater .emit OPERATOR_RSHIFT .or*/
 701     greater .emit OPERATOR_GREATER .or
 702     /*percentequals .emit OPERATOR_MODASSIGN .or*/
 703     /*percent .emit OPERATOR_MODULUS .or*/
 704     /*ampersandequals .emit OPERATOR_ANDASSIGN */
 705     /*ampersand .emit OPERATOR_BITAND .or*/
 706     /*barequals .emit OPERATOR_ORASSIGN .or*/
 707     /*bar .emit OPERATOR_BITOR .or*/
 708     /*tilde .emit OPERATOR_COMPLEMENT .or*/
 709     /*caretequals .emit OPERATOR_XORASSIGN .or*/
 710     caretcaret .emit OPERATOR_LOGICALXOR /*.or
 711     caret .emit OPERATOR_BITXOR*/;
 712
 713 /*
 714     <parameter_declarator>              ::= <type_specifier> <identifier>
 715                                           | <type_specifier> <identifier> "[" <constant_expression>
 716                                             "]"
 717 */
 718 parameter_declarator
 719     parameter_declarator_nospace .or parameter_declarator_space;
 720 parameter_declarator_nospace
 721     type_specifier_nospace .and identifier .and parameter_declarator_1;
 722 parameter_declarator_space
 723     type_specifier_space .and space .and identifier .and parameter_declarator_1;
 724 parameter_declarator_1
 725     parameter_declarator_2 .emit PARAMETER_ARRAY_PRESENT .or
 726     .true .emit PARAMETER_ARRAY_NOT_PRESENT;
 727 parameter_declarator_2
 728     lbracket .and constant_expression .and rbracket;
 729
 730 /*
 731     <parameter_declaration>             ::= <type_qualifier> <parameter_qualifier>
 732                                             <parameter_declarator>
 733                                           | <type_qualifier> <parameter_qualifier>
 734                                             <parameter_type_specifier>
 735                                           | <parameter_qualifier> <parameter_declarator>
 736                                           | <parameter_qualifier> <parameter_type_specifier>
 737 */
 738 parameter_declaration
 739     parameter_declaration_1 .emit PARAMETER_NEXT;
 740 parameter_declaration_1
 741     parameter_declaration_2 .or parameter_declaration_3;
 742 parameter_declaration_2
 743     type_qualifier .and space .and parameter_qualifier .and parameter_declaration_4;
 744 parameter_declaration_3
 745     parameter_qualifier .emit TYPE_QUALIFIER_NONE .and parameter_declaration_4;
 746 parameter_declaration_4
 747     parameter_declarator .or parameter_type_specifier;
 748
 749 /*
 750     <parameter_qualifier>               ::= "in"
 751                                           | "out"
 752                                           | "inout"
 753                                           | ""
 754 */
 755 parameter_qualifier
 756     parameter_qualifier_1 .or .true .emit PARAM_QUALIFIER_IN;
 757 parameter_qualifier_1
 758     parameter_qualifier_2 .and space;
 759 parameter_qualifier_2
 760     "in" .emit PARAM_QUALIFIER_IN .or
 761     "out" .emit PARAM_QUALIFIER_OUT .or
 762     "inout" .emit PARAM_QUALIFIER_INOUT;
 763
 764 /*
 765     <parameter_type_specifier>          ::= <type_specifier>
 766                                           | <type_specifier> "[" <constant_expression> "]"
 767 */
 768 parameter_type_specifier
 769     parameter_type_specifier_1 .and .true .emit '\0' .and parameter_type_specifier_2;
 770 parameter_type_specifier_1
 771     type_specifier_nospace .or type_specifier_space;
 772 parameter_type_specifier_2
 773     parameter_type_specifier_3 .emit PARAMETER_ARRAY_PRESENT .or
 774     .true .emit PARAMETER_ARRAY_NOT_PRESENT;
 775 parameter_type_specifier_3
 776     lbracket .and constant_expression .and rbracket;
 777
 778 /*
 779     <init_declarator_list>              ::= <single_declaration>
 780                                           | <init_declarator_list> "," <identifier>
 781                                           | <init_declarator_list> "," <identifier> "[" "]"
 782                                           | <init_declarator_list> "," <identifier> "["
 783                                             <constant_expression> "]"
 784                                           | <init_declarator_list> "," <identifier> "="
 785                                             <initializer>
 786 */
 787 init_declarator_list
 788     single_declaration .and .loop init_declarator_list_1 .emit DECLARATOR_NEXT .and
 789     .true .emit DECLARATOR_NONE;
 790 init_declarator_list_1
 791     comma .and identifier .emit VARIABLE_IDENTIFIER .and init_declarator_list_2;
 792 init_declarator_list_2
 793     init_declarator_list_3 .or init_declarator_list_4 .or .true .emit VARIABLE_NONE;
 794 init_declarator_list_3
 795     equals .and initializer .emit VARIABLE_INITIALIZER;
 796 init_declarator_list_4
 797     lbracket .and init_declarator_list_5 .and rbracket;
 798 init_declarator_list_5
 799     constant_expression .emit VARIABLE_ARRAY_EXPLICIT .or .true .emit VARIABLE_ARRAY_UNKNOWN;
 800
 801 /*
 802     <single_declaration>                ::= <fully_specified_type>
 803                                           | <fully_specified_type> <identifier>
 804                                           | <fully_specified_type> <identifier> "[" "]"
 805                                           | <fully_specified_type> <identifier> "["
 806                                             <constant_expression> "]"
 807                                           | <fully_specified_type> <identifier> "=" <initializer>
 808 */
 809 single_declaration
 810     single_declaration_nospace .or single_declaration_space;
 811 single_declaration_space
 812     fully_specified_type_space .and single_declaration_space_1;
 813 single_declaration_nospace
 814     fully_specified_type_nospace .and single_declaration_nospace_1;
 815 single_declaration_space_1
 816     single_declaration_space_2 .emit VARIABLE_IDENTIFIER .or .true .emit VARIABLE_NONE;
 817 single_declaration_nospace_1
 818     single_declaration_nospace_2 .emit VARIABLE_IDENTIFIER .or .true .emit VARIABLE_NONE;
 819 single_declaration_space_2
 820     space .and identifier .and single_declaration_3;
 821 single_declaration_nospace_2
 822     identifier .and single_declaration_3;
 823 single_declaration_3
 824     single_declaration_4 .or single_declaration_5 .or .true .emit VARIABLE_NONE;
 825 single_declaration_4
 826     equals .and initializer .emit VARIABLE_INITIALIZER;
 827 single_declaration_5
 828     lbracket .and single_declaration_6 .and rbracket;
 829 single_declaration_6
 830     constant_expression .emit VARIABLE_ARRAY_EXPLICIT .or .true .emit VARIABLE_ARRAY_UNKNOWN;
 831
 832 /*
 833     <fully_specified_type>              ::= <type_specifier>
 834                                           | <type_qualifier> <type_specifier>
 835 */
 836 fully_specified_type_space
 837     fully_specified_type_1 .and type_specifier_space;
 838 fully_specified_type_nospace
 839     fully_specified_type_1 .and type_specifier_nospace;
 840 fully_specified_type_1
 841     fully_specified_type_2 .or .true .emit TYPE_QUALIFIER_NONE;
 842 fully_specified_type_2
 843     type_qualifier .and space;
 844
 845 /*
 846     <type_qualifier>                    ::= "const"
 847                                           | "attribute" // Vertex only.
 848                                           | "varying"
 849                                           | "uniform"
 850                                                                                   | "__fixed_output"
 851                                                                                   | "__fixed_input"
 852
 853 note: this is an extension to the standard language specification - normally slang disallows
 854       __fixed_output and __fixed_input type qualifiers
 855 */
 856 type_qualifier
 857     "const" .emit TYPE_QUALIFIER_CONST .or
 858     .if (shader_type == 2) "attribute" .emit TYPE_QUALIFIER_ATTRIBUTE .or
 859     "varying" .emit TYPE_QUALIFIER_VARYING .or
 860     "uniform" .emit TYPE_QUALIFIER_UNIFORM .or
 861         .if (parsing_builtin != 0) "__fixed_output" .emit TYPE_QUALIFIER_FIXEDOUTPUT .or
 862         .if (parsing_builtin != 0) "__fixed_input" .emit TYPE_QUALIFIER_FIXEDINPUT;
 863
 864 /*
 865     <type_specifier>                    ::= "void"
 866                                           | "float"
 867                                           | "int"
 868                                           | "bool"
 869                                           | "vec2"
 870                                           | "vec3"
 871                                           | "vec4"
 872                                           | "bvec2"
 873                                           | "bvec3"
 874                                           | "bvec4"
 875                                           | "ivec2"
 876                                           | "ivec3"
 877                                           | "ivec4"
 878                                           | "mat2"
 879                                           | "mat3"
 880                                           | "mat4"
 881                                           | "sampler1D"
 882                                           | "sampler2D"
 883                                           | "sampler3D"
 884                                           | "samplerCube"
 885                                           | "sampler1DShadow"
 886                                           | "sampler2DShadow"
 887                                           | <struct_specifier>
 888                                           | <type_name>
 889 */
 890 type_specifier_space
 891     "void" .emit TYPE_SPECIFIER_VOID .or
 892     "float" .emit TYPE_SPECIFIER_FLOAT .or
 893     "int" .emit TYPE_SPECIFIER_INT .or
 894     "bool" .emit TYPE_SPECIFIER_BOOL .or
 895     "vec2" .emit TYPE_SPECIFIER_VEC2 .or
 896     "vec3" .emit TYPE_SPECIFIER_VEC3 .or
 897     "vec4" .emit TYPE_SPECIFIER_VEC4 .or
 898     "bvec2" .emit TYPE_SPECIFIER_BVEC2 .or
 899     "bvec3" .emit TYPE_SPECIFIER_BVEC3 .or
 900     "bvec4" .emit TYPE_SPECIFIER_BVEC4 .or
 901     "ivec2" .emit TYPE_SPECIFIER_IVEC2 .or
 902     "ivec3" .emit TYPE_SPECIFIER_IVEC3 .or
 903     "ivec4" .emit TYPE_SPECIFIER_IVEC4 .or
 904     "mat2" .emit TYPE_SPECIFIER_MAT2 .or
 905     "mat3" .emit TYPE_SPECIFIER_MAT3 .or
 906     "mat4" .emit TYPE_SPECIFIER_MAT4 .or
 907     "sampler1D" .emit TYPE_SPECIFIER_SAMPLER1D .or
 908     "sampler2D" .emit TYPE_SPECIFIER_SAMPLER2D .or
 909     "sampler3D" .emit TYPE_SPECIFIER_SAMPLER3D .or
 910     "samplerCube" .emit TYPE_SPECIFIER_SAMPLERCUBE .or
 911     "sampler1DShadow" .emit TYPE_SPECIFIER_SAMPLER1DSHADOW .or
 912     "sampler2DShadow" .emit TYPE_SPECIFIER_SAMPLER2DSHADOW .or
 913     type_name .emit TYPE_SPECIFIER_TYPENAME;
 914 type_specifier_nospace
 915     struct_specifier .emit TYPE_SPECIFIER_STRUCT;
 916
 917 /*
 918     <struct_specifier>                  ::= "struct" <identifier> "{" <struct_declaration_list> "}"
 919                                           | "struct" "{" <struct_declaration_list> "}"
 920 */
 921 struct_specifier
 922     "struct" .and struct_specifier_1 .and optional_space .and lbrace .error LBRACE_EXPECTED .and
 923     struct_declaration_list .and rbrace .emit FIELD_NONE;
 924 struct_specifier_1
 925     struct_specifier_2 .or .true .emit '\0';
 926 struct_specifier_2
 927     space .and identifier;
 928
 929 /*
 930     <struct_declaration_list>           ::= <struct_declaration>
 931                                           | <struct_declaration_list> <struct_declaration>
 932 */
 933 struct_declaration_list
 934     struct_declaration .and .loop struct_declaration .emit FIELD_NEXT;
 935
 936 /*
 937     <struct_declaration>                ::= <type_specifier> <struct_declarator_list> ";"
 938 */
 939 struct_declaration
 940     struct_declaration_nospace .or struct_declaration_space;
 941 struct_declaration_space
 942     type_specifier_space .and space .and struct_declarator_list .and semicolon .emit FIELD_NONE;
 943 struct_declaration_nospace
 944     type_specifier_nospace .and struct_declarator_list .and semicolon .emit FIELD_NONE;
 945
 946 /*
 947     <struct_declarator_list>            ::= <struct_declarator>
 948                                           | <struct_declarator_list> "," <struct_declarator>
 949 */
 950 struct_declarator_list
 951     struct_declarator .and .loop struct_declarator_list_1 .emit FIELD_NEXT;
 952 struct_declarator_list_1
 953     comma .and struct_declarator;
 954
 955 /*
 956     <struct_declarator>                 ::= <identifier>
 957                                           | <identifier> "[" <constant_expression> "]"
 958 */
 959 struct_declarator
 960     identifier .and struct_declarator_1;
 961 struct_declarator_1
 962     struct_declarator_2 .emit FIELD_ARRAY .or .true .emit FIELD_NONE;
 963 struct_declarator_2
 964     lbracket .and constant_expression .and rbracket;
 965
 966 /*
 967     <initializer>                       ::= <assignment_expression>
 968 */
 969 initializer
 970     assignment_expression .and .true .emit OP_END;
 971
 972 /*
 973     <declaration_statement>             ::= <declaration>
 974 */
 975 declaration_statement
 976     declaration;
 977
 978 /*
 979     <statement>                         ::= <compound_statement>
 980                                           | <simple_statement>
 981 */
 982 statement
 983     compound_statement .or simple_statement;
 984 statement_space
 985     compound_statement .or statement_space_1;
 986 statement_space_1
 987     space .and simple_statement;
 988
 989 /*
 990     <simple_statement>                  ::= <__asm_statement>
 991                                           | <selection_statement>
 992                                           | <iteration_statement>
 993                                           | <jump_statement>
 994                                           | <expression_statement>
 995                                           | <declaration_statement>
 996
 997 note: this is an extension to the standard language specification - normally slang disallows
 998       use of __asm statements
 999 */
1000 simple_statement
1001     .if (parsing_builtin != 0) __asm_statement .emit OP_ASM .or
1002     selection_statement .or
1003     iteration_statement .or
1004     jump_statement .or
1005     expression_statement .emit OP_EXPRESSION .or
1006     declaration_statement .emit OP_DECLARE;
1007
1008 /*
1009     <compound_statement>                ::= "{" "}"
1010                                           | "{" <statement_list> "}"
1011 */
1012 compound_statement
1013     compound_statement_1 .emit OP_BLOCK_BEGIN_NEW_SCOPE .and .true .emit OP_END;
1014 compound_statement_1
1015     compound_statement_2 .or compound_statement_3;
1016 compound_statement_2
1017     lbrace .and rbrace;
1018 compound_statement_3
1019     lbrace .and statement_list .and rbrace;
1020
1021 /*
1022     <statement_no_new_scope>            ::= <compound_statement_no_new_scope>
1023                                           | <simple_statement>
1024 */
1025 statement_no_new_scope
1026     compound_statement_no_new_scope .or simple_statement;
1027
1028 /*
1029     <compound_statement_no_new_scope>   ::= "{" "}"
1030                                           | "{" <statement_list> "}"
1031 */
1032 compound_statement_no_new_scope
1033     compound_statement_no_new_scope_1 .emit OP_BLOCK_BEGIN_NO_NEW_SCOPE .and .true .emit OP_END;
1034 compound_statement_no_new_scope_1
1035     compound_statement_no_new_scope_2 .or compound_statement_no_new_scope_3;
1036 compound_statement_no_new_scope_2
1037     lbrace .and rbrace;
1038 compound_statement_no_new_scope_3
1039     lbrace .and statement_list .and rbrace;
1040
1041 /*
1042     <statement_list>                    ::= <statement>
1043                                           | <statement_list> <statement>
1044 */
1045 statement_list
1046     statement .and .loop statement;
1047
1048 /*
1049     <expression_statement>              ::= ";"
1050                                           | <expression> ";"
1051 */
1052 expression_statement
1053     expression_statement_1 .or expression_statement_2;
1054 expression_statement_1
1055     semicolon .emit OP_PUSH_VOID .emit OP_END;
1056 expression_statement_2
1057     expression .and semicolon .emit OP_END;
1058
1059 /*
1060     <selection_statement>               ::= "if" "(" <expression> ")" <selection_rest_statement>
1061 */
1062 selection_statement
1063     "if" .emit OP_IF .and lparen .error LPAREN_EXPECTED .and expression .and
1064     rparen .error RPAREN_EXPECTED .emit OP_END .and selection_rest_statement;
1065
1066 /*
1067     <selection_rest_statement>          ::= <statement> "else" <statement>
1068                                           | <statement>
1069 */
1070 selection_rest_statement
1071     statement .and selection_rest_statement_1;
1072 selection_rest_statement_1
1073     selection_rest_statement_2 .or .true .emit OP_EXPRESSION .emit OP_PUSH_VOID .emit OP_END;
1074 selection_rest_statement_2
1075     "else" .and optional_space .and statement;
1076
1077 /*
1078     <condition>                         ::= <expression>
1079                                           | <fully_specified_type> <identifier> "=" <initializer>
1080
1081 note: if <condition_1> is executed, the emit format must match <declaration> emit format
1082 */
1083 condition
1084     condition_1 .emit OP_DECLARE .emit DECLARATION_INIT_DECLARATOR_LIST .or
1085     condition_3 .emit OP_EXPRESSION;
1086 condition_1
1087     condition_1_nospace .or condition_1_space;
1088 condition_1_nospace
1089     fully_specified_type_nospace .and condition_2;
1090 condition_1_space
1091     fully_specified_type_space .and space .and condition_2;
1092 condition_2
1093     identifier .emit VARIABLE_IDENTIFIER .and equals .emit VARIABLE_INITIALIZER .and
1094     initializer .and .true .emit DECLARATOR_NONE;
1095 condition_3
1096     expression .and .true .emit OP_END;
1097
1098 /*
1099     <iteration_statement>               ::= "while" "(" <condition> ")" <statement_no_new_scope>
1100                                           | "do" <statement> "while" "(" <expression> ")" ";"
1101                                           | "for" "(" <for_init_statement> <for_rest_statement> ")"
1102                                             <statement_no_new_scope>
1103 */
1104 iteration_statement
1105     iteration_statement_1 .or iteration_statement_2 .or iteration_statement_3;
1106 iteration_statement_1
1107     "while" .emit OP_WHILE .and lparen .error LPAREN_EXPECTED .and condition .and
1108     rparen .error RPAREN_EXPECTED .and statement_no_new_scope;
1109 iteration_statement_2
1110     "do" .emit OP_DO .and statement_space .and "while" .and lparen .error LPAREN_EXPECTED .and
1111     expression .and rparen .error RPAREN_EXPECTED .emit OP_END .and semicolon;
1112 iteration_statement_3
1113     "for" .emit OP_FOR .and lparen .error LPAREN_EXPECTED .and for_init_statement .and
1114     for_rest_statement .and rparen .error RPAREN_EXPECTED .and statement_no_new_scope;
1115
1116 /*
1117     <for_init_statement>                ::= <expression_statement>
1118                                           | <declaration_statement>
1119 */
1120 for_init_statement
1121     expression_statement .emit OP_EXPRESSION .or declaration_statement .emit OP_DECLARE;
1122
1123 /*
1124     <conditionopt>                      ::= <condition>
1125                                           | ""
1126
1127 note: <conditionopt> is used only by "for" statement - if <condition> is ommitted, parser
1128       simulates default behaviour, that is simulates "true" expression
1129 */
1130 conditionopt
1131     condition .or
1132     .true .emit OP_EXPRESSION .emit OP_PUSH_BOOL .emit 2 .emit '1' .emit '\0' .emit OP_END;
1133
1134 /*
1135     <for_rest_statement>                ::= <conditionopt> ";"
1136                                           | <conditionopt> ";" <expression>
1137 */
1138 for_rest_statement
1139     conditionopt .and semicolon .and for_rest_statement_1;
1140 for_rest_statement_1
1141     for_rest_statement_2 .or .true .emit OP_PUSH_VOID .emit OP_END;
1142 for_rest_statement_2
1143     expression .and .true .emit OP_END;
1144
1145 /*
1146     <jump_statement>                    ::= "continue" ";"
1147                                           | "break" ";"
1148                                           | "return" ";"
1149                                           | "return" <expression> ";"
1150                                           | "discard" ";" // Fragment shader only.
1151 */
1152 jump_statement
1153     jump_statement_1 .or jump_statement_2 .or jump_statement_3 .or jump_statement_4 .or
1154     .if (shader_type == 1) jump_statement_5;
1155 jump_statement_1
1156     "continue" .and semicolon .emit OP_CONTINUE;
1157 jump_statement_2
1158     "break" .and semicolon .emit OP_BREAK;
1159 jump_statement_3
1160     "return" .emit OP_RETURN .and optional_space .and expression .and semicolon .emit OP_END;
1161 jump_statement_4
1162     "return" .emit OP_RETURN .and semicolon .emit OP_PUSH_VOID .emit OP_END;
1163 jump_statement_5
1164     "discard" .and semicolon .emit OP_DISCARD;
1165
1166 /*
1167     <__asm_statement>                   ::= "__asm" <identifier> <asm_arguments> ";"
1168
1169 note: this is an extension to the standard language specification - normally slang disallows
1170       __asm statements
1171 */
1172 __asm_statement
1173     "__asm" .and space .and identifier .and space .and asm_arguments .and semicolon .emit OP_END;
1174
1175 /*
1176     <asm_arguments>                     ::= <asm_argument>
1177                                           | <asm_arguments> "," <asm_argument>
1178
1179 note: this is an extension to the standard language specification - normally slang disallows
1180       __asm statements
1181 */
1182 asm_arguments
1183     asm_argument .and .true .emit OP_END .and .loop asm_arguments_1;
1184 asm_arguments_1
1185     comma .and asm_argument .and .true .emit OP_END;
1186
1187 /*
1188     <asm_argument>                      ::= <variable_identifier>
1189                                           | <floatconstant>
1190
1191 note: this is an extension to the standard language specification - normally slang disallows
1192       __asm statements
1193 */
1194 asm_argument
1195     var_with_field .or
1196     variable_identifier .or
1197     floatconstant;
1198
1199 var_with_field
1200     variable_identifier .and dot .and field_selection .emit OP_FIELD;
1201
1202 /*
1203     <translation_unit>                  ::= <external_declaration>
1204                                           | <translation_unit> <external_declaration>
1205 */
1206 translation_unit
1207     optional_space .emit REVISION .and external_declaration .error INVALID_EXTERNAL_DECLARATION .and
1208     .loop external_declaration .and optional_space .and
1209     '\0' .error INVALID_EXTERNAL_DECLARATION .emit EXTERNAL_NULL;
1210
1211 /*
1212     <external_declaration>              ::= <function_definition>
1213                                           | <declaration>
1214 */
1215 external_declaration
1216     function_definition .emit EXTERNAL_FUNCTION_DEFINITION .or
1217     declaration .emit EXTERNAL_DECLARATION;
1218
1219 /*
1220     <function_definition>               :: <function_prototype> <compound_statement_no_new_scope>
1221 */
1222 function_definition
1223     function_prototype .and compound_statement_no_new_scope;
1224
1225 /* helper rulez, not part of the official language syntax */
1226
1227 digit_oct
1228     '0'-'7';
1229
1230 digit_dec
1231     '0'-'9';
1232
1233 digit_hex
1234     '0'-'9' .or 'A'-'F' .or 'a'-'f';
1235
1236 id_character_first
1237     'a'-'z' .or 'A'-'Z' .or '_';
1238
1239 id_character_next
1240     id_character_first .or digit_dec;
1241
1242 identifier
1243     id_character_first .emit * .and .loop id_character_next .emit * .and .true .emit '\0';
1244
1245 float
1246     float_1 .or float_2;
1247 float_1
1248     float_fractional_constant .and float_optional_exponent_part;
1249 float_2
1250     float_digit_sequence .and .true .emit '\0' .and float_exponent_part;
1251
1252 float_fractional_constant
1253     float_fractional_constant_1 .or float_fractional_constant_2 .or float_fractional_constant_3;
1254 float_fractional_constant_1
1255     float_digit_sequence .and '.' .and float_digit_sequence;
1256 float_fractional_constant_2
1257     float_digit_sequence .and '.' .and .true .emit '\0';
1258 float_fractional_constant_3
1259     '.' .emit '\0' .and float_digit_sequence;
1260
1261 float_optional_exponent_part
1262     float_exponent_part .or .true .emit '\0';
1263
1264 float_digit_sequence
1265     digit_dec .emit * .and .loop digit_dec .emit * .and .true .emit '\0';
1266
1267 float_exponent_part
1268     float_exponent_part_1 .or float_exponent_part_2;
1269 float_exponent_part_1
1270     'e' .and float_optional_sign .and float_digit_sequence;
1271 float_exponent_part_2
1272     'E' .and float_optional_sign .and float_digit_sequence;
1273
1274 float_optional_sign
1275     float_sign .or .true;
1276
1277 float_sign
1278     '+' .or '-' .emit '-';
1279
1280 integer
1281     integer_hex .or integer_oct .or integer_dec;
1282
1283 integer_hex
1284     '0' .and integer_hex_1 .emit 0x10 .and digit_hex .emit * .and .loop digit_hex .emit * .and
1285     .true .emit '\0';
1286 integer_hex_1
1287     'x' .or 'X';
1288
1289 integer_oct
1290     '0' .emit 8 .emit * .and .loop digit_oct .emit * .and .true .emit '\0';
1291
1292 integer_dec
1293     digit_dec .emit 10 .emit * .and .loop digit_dec .emit * .and .true .emit '\0';
1294
1295 boolean
1296     "true" .emit 2 .emit '1' .emit '\0' .or
1297     "false" .emit 2 .emit '0' .emit '\0';
1298
1299 type_name
1300     identifier;
1301
1302 field_selection
1303     identifier;
1304
1305 floatconstant
1306     float .emit OP_PUSH_FLOAT;
1307
1308 intconstant
1309     integer .emit OP_PUSH_INT;
1310
1311 boolconstant
1312     boolean .emit OP_PUSH_BOOL;
1313
1314 optional_space
1315     .loop single_space;
1316
1317 space
1318     single_space .and .loop single_space;
1319
1320 single_space
1321     white_char .or c_style_comment_block .or cpp_style_comment_block;
1322
1323 white_char
1324     ' ' .or '\t' .or new_line .or '\v' .or '\f';
1325
1326 new_line
1327     cr_lf .or lf_cr .or '\n' .or '\r';
1328
1329 cr_lf
1330     '\r' .and '\n';
1331
1332 lf_cr
1333     '\n' .and '\r';
1334
1335 c_style_comment_block
1336     '/' .and '*' .and c_style_comment_rest;
1337
1338 c_style_comment_rest
1339     .loop c_style_comment_char_no_star .and c_style_comment_rest_1;
1340 c_style_comment_rest_1
1341     c_style_comment_end .or c_style_comment_rest_2;
1342 c_style_comment_rest_2
1343     '*' .and c_style_comment_rest;
1344
1345 c_style_comment_char_no_star
1346     '\x2B'-'\xFF' .or '\x01'-'\x29';
1347
1348 c_style_comment_end
1349     '*' .and '/';
1350
1351 cpp_style_comment_block
1352     '/' .and '/' .and cpp_style_comment_block_1;
1353 cpp_style_comment_block_1
1354     cpp_style_comment_block_2 .or cpp_style_comment_block_3;
1355 cpp_style_comment_block_2
1356     .loop cpp_style_comment_char .and new_line;
1357 cpp_style_comment_block_3
1358     .loop cpp_style_comment_char;
1359
1360 cpp_style_comment_char
1361     '\x0E'-'\xFF' .or '\x01'-'\x09' .or '\x0B'-'\x0C';
1362
1363 /* lexical rulez */
1364
1365 /*ampersand
1366     optional_space .and '&' .and optional_space;*/
1367
1368 ampersandampersand
1369     optional_space .and '&' .and '&' .and optional_space;
1370
1371 /*ampersandequals
1372     optional_space .and '&' .and '=' .and optional_space;*/
1373
1374 /*bar
1375     optional_space .and '|' .and optional_space;*/
1376
1377 barbar
1378     optional_space .and '|' .and '|' .and optional_space;
1379
1380 /*barequals
1381     optional_space .and '|' .and '=' .and optional_space;*/
1382
1383 bang
1384     optional_space .and '!' .and optional_space;
1385
1386 bangequals
1387     optional_space .and '!' .and '=' .and optional_space;
1388
1389 /*caret
1390     optional_space .and '^' .and optional_space;*/
1391
1392 caretcaret
1393     optional_space .and '^' .and '^' .and optional_space;
1394
1395 /*caretequals
1396     optional_space .and '^' .and '=' .and optional_space;*/
1397
1398 colon
1399     optional_space .and ':' .and optional_space;
1400
1401 comma
1402     optional_space .and ',' .and optional_space;
1403
1404 dot
1405     optional_space .and '.' .and optional_space;
1406
1407 equals
1408     optional_space .and '=' .and optional_space;
1409
1410 equalsequals
1411     optional_space .and '=' .and '=' .and optional_space;
1412
1413 greater
1414     optional_space .and '>' .and optional_space;
1415
1416 greaterequals
1417     optional_space .and '>' .and '=' .and optional_space;
1418
1419 /*greatergreater
1420     optional_space .and '>' .and '>' .and optional_space;*/
1421
1422 /*greatergreaterequals
1423     optional_space .and '>' .and '>' .and '=' .and optional_space;*/
1424
1425 lbrace
1426     optional_space .and '{' .and optional_space;
1427
1428 lbracket
1429     optional_space .and '[' .and optional_space;
1430
1431 less
1432     optional_space .and '<' .and optional_space;
1433
1434 lessequals
1435     optional_space .and '<' .and '=' .and optional_space;
1436
1437 /*lessless
1438     optional_space .and '<' .and '<' .and optional_space;*/
1439
1440 /*lesslessequals
1441     optional_space .and '<' .and '<' .and '=' .and optional_space;*/
1442
1443 lparen
1444     optional_space .and '(' .and optional_space;
1445
1446 minus
1447     optional_space .and '-' .and optional_space;
1448
1449 minusequals
1450     optional_space .and '-' .and '=' .and optional_space;
1451
1452 minusminus
1453     optional_space .and '-' .and '-' .and optional_space;
1454
1455 /*percent
1456     optional_space .and '%' .and optional_space;*/
1457
1458 /*percentequals
1459     optional_space .and '%' .and '=' .and optional_space;*/
1460
1461 plus
1462     optional_space .and '+' .and optional_space;
1463
1464 plusequals
1465     optional_space .and '+' .and '=' .and optional_space;
1466
1467 plusplus
1468     optional_space .and '+' .and '+' .and optional_space;
1469
1470 question
1471     optional_space .and '?' .and optional_space;
1472
1473 rbrace
1474     optional_space .and '}' .and optional_space;
1475
1476 rbracket
1477     optional_space .and ']' .and optional_space;
1478
1479 rparen
1480     optional_space .and ')' .and optional_space;
1481
1482 semicolon
1483     optional_space .and ';' .and optional_space;
1484
1485 slash
1486     optional_space .and '/' .and optional_space;
1487
1488 slashequals
1489     optional_space .and '/' .and '=' .and optional_space;
1490
1491 star
1492     optional_space .and '*' .and optional_space;
1493
1494 starequals
1495     optional_space .and '*' .and '=' .and optional_space;
1496
1497 /*tilde
1498     optional_space .and '~' .and optional_space;*/
1499
1500 /* string rulez - these are used internally by the parser when parsing quoted strings */
1501
1502 .string string_lexer;
1503
1504 string_lexer
1505     lex_first_identifier_character .and .loop lex_next_identifier_character;
1506
1507 lex_first_identifier_character
1508     'a'-'z' .or 'A'-'Z' .or '_';
1509
1510 lex_next_identifier_character
1511     'a'-'z' .or 'A'-'Z' .or '0'-'9' .or '_';
1512
1513 /* error rulez - these are used by error messages */
1514
1515 err_token
1516     '~' .or '`' .or '!' .or '@' .or '#' .or '$' .or '%' .or '^' .or '&' .or '*' .or '(' .or ')' .or
1517     '-' .or '+' .or '=' .or '|' .or '\\' .or '[' .or ']' .or '{' .or '}' .or ':' .or ';' .or '"' .or
1518     '\'' .or '<' .or ',' .or '>' .or '.' .or '/' .or '?' .or err_identifier;
1519
1520 err_identifier
1521     id_character_first .and .loop id_character_next;
1522