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_SAMPLER2DRECT               22
 143 .emtcode TYPE_SPECIFIER_SAMPLER2DRECTSHADOW         23
 144 .emtcode TYPE_SPECIFIER_STRUCT                      24
 145 .emtcode TYPE_SPECIFIER_TYPENAME                    25
 146
 147 /* structure field */
 148 .emtcode FIELD_NONE                                 0
 149 .emtcode FIELD_NEXT                                 1
 150 .emtcode FIELD_ARRAY                                2
 151
 152 /* operation */
 153 .emtcode OP_END                                     0
 154 .emtcode OP_BLOCK_BEGIN_NO_NEW_SCOPE                1
 155 .emtcode OP_BLOCK_BEGIN_NEW_SCOPE                   2
 156 .emtcode OP_DECLARE                                 3
 157 .emtcode OP_ASM                                     4
 158 .emtcode OP_BREAK                                   5
 159 .emtcode OP_CONTINUE                                6
 160 .emtcode OP_DISCARD                                 7
 161 .emtcode OP_RETURN                                  8
 162 .emtcode OP_EXPRESSION                              9
 163 .emtcode OP_IF                                      10
 164 .emtcode OP_WHILE                                   11
 165 .emtcode OP_DO                                      12
 166 .emtcode OP_FOR                                     13
 167 .emtcode OP_PUSH_VOID                               14
 168 .emtcode OP_PUSH_BOOL                               15
 169 .emtcode OP_PUSH_INT                                16
 170 .emtcode OP_PUSH_FLOAT                              17
 171 .emtcode OP_PUSH_IDENTIFIER                         18
 172 .emtcode OP_SEQUENCE                                19
 173 .emtcode OP_ASSIGN                                  20
 174 .emtcode OP_ADDASSIGN                               21
 175 .emtcode OP_SUBASSIGN                               22
 176 .emtcode OP_MULASSIGN                               23
 177 .emtcode OP_DIVASSIGN                               24
 178 /*.emtcode OP_MODASSIGN                               25*/
 179 /*.emtcode OP_LSHASSIGN                               26*/
 180 /*.emtcode OP_RSHASSIGN                               27*/
 181 /*.emtcode OP_ORASSIGN                                28*/
 182 /*.emtcode OP_XORASSIGN                               29*/
 183 /*.emtcode OP_ANDASSIGN                               30*/
 184 .emtcode OP_SELECT                                  31
 185 .emtcode OP_LOGICALOR                               32
 186 .emtcode OP_LOGICALXOR                              33
 187 .emtcode OP_LOGICALAND                              34
 188 /*.emtcode OP_BITOR                                   35*/
 189 /*.emtcode OP_BITXOR                                  36*/
 190 /*.emtcode OP_BITAND                                  37*/
 191 .emtcode OP_EQUAL                                   38
 192 .emtcode OP_NOTEQUAL                                39
 193 .emtcode OP_LESS                                    40
 194 .emtcode OP_GREATER                                 41
 195 .emtcode OP_LESSEQUAL                               42
 196 .emtcode OP_GREATEREQUAL                            43
 197 /*.emtcode OP_LSHIFT                                  44*/
 198 /*.emtcode OP_RSHIFT                                  45*/
 199 .emtcode OP_ADD                                     46
 200 .emtcode OP_SUBTRACT                                47
 201 .emtcode OP_MULTIPLY                                48
 202 .emtcode OP_DIVIDE                                  49
 203 /*.emtcode OP_MODULUS                                 50*/
 204 .emtcode OP_PREINCREMENT                            51
 205 .emtcode OP_PREDECREMENT                            52
 206 .emtcode OP_PLUS                                    53
 207 .emtcode OP_MINUS                                   54
 208 /*.emtcode OP_COMPLEMENT                              55*/
 209 .emtcode OP_NOT                                     56
 210 .emtcode OP_SUBSCRIPT                               57
 211 .emtcode OP_CALL                                    58
 212 .emtcode OP_FIELD                                   59
 213 .emtcode OP_POSTINCREMENT                           60
 214 .emtcode OP_POSTDECREMENT                           61
 215
 216 /* parameter qualifier */
 217 .emtcode PARAM_QUALIFIER_IN                         0
 218 .emtcode PARAM_QUALIFIER_OUT                        1
 219 .emtcode PARAM_QUALIFIER_INOUT                      2
 220
 221 /* function parameter */
 222 .emtcode PARAMETER_NONE                             0
 223 .emtcode PARAMETER_NEXT                             1
 224
 225 /* function parameter array presence */
 226 .emtcode PARAMETER_ARRAY_NOT_PRESENT                0
 227 .emtcode PARAMETER_ARRAY_PRESENT                    1
 228
 229 .errtext INVALID_EXTERNAL_DECLARATION               "2001: Invalid external declaration."
 230 .errtext INVALID_OPERATOR_OVERRIDE                  "2002: Invalid operator override."
 231 .errtext LBRACE_EXPECTED                            "2003: '{' expected but '$err_token$' found."
 232 .errtext LPAREN_EXPECTED                            "2004: '(' expected but '$err_token$' found."
 233 .errtext RPAREN_EXPECTED                            "2005: ')' expected but '$err_token$' found."
 234
 235 /* tells whether the shader that is being parsed is a built-in shader or not */
 236 /*   0 - normal behaviour */
 237 /*   1 - accepts constructor and operator definitions and __asm statements */
 238 /* the implementation will set it to 1 when compiling internal built-in shaders */
 239 .regbyte parsing_builtin                            0
 240
 241 /* holds the type of the shader being parsed; possible values are listed below */
 242 /*   FRAGMENT_SHADER            1 */
 243 /*   VERTEX_SHADER              2 */
 244 /* shader type is set by the caller before parsing */
 245 .regbyte shader_type                                0
 246
 247 /*
 248     <variable_identifier>               ::= <identifier>
 249 */
 250 variable_identifier
 251     identifier .emit OP_PUSH_IDENTIFIER;
 252
 253 /*
 254     <primary_expression>                ::= <variable_identifier>
 255                                           | <intconstant>
 256                                           | <floatconstant>
 257                                           | <boolconstant>
 258                                           | "(" <expression> ")"
 259 */
 260 primary_expression
 261     floatconstant .or boolconstant .or intconstant .or variable_identifier .or primary_expression_1;
 262 primary_expression_1
 263     lparen .and expression .and rparen;
 264
 265 /*
 266     <postfix_expression>                ::= <primary_expression>
 267                                           | <postfix_expression> "[" <integer_expression> "]"
 268                                           | <function_call>
 269                                           | <postfix_expression> "." <field_selection>
 270                                           | <postfix_expression> "++"
 271                                           | <postfix_expression> "--"
 272 */
 273 postfix_expression
 274     postfix_expression_1 .and .loop postfix_expression_2;
 275 postfix_expression_1
 276     function_call .or primary_expression;
 277 postfix_expression_2
 278     postfix_expression_3 .or postfix_expression_4 .or
 279     plusplus .emit OP_POSTINCREMENT .or
 280     minusminus .emit OP_POSTDECREMENT;
 281 postfix_expression_3
 282     lbracket .and integer_expression .and rbracket .emit OP_SUBSCRIPT;
 283 postfix_expression_4
 284     dot .and field_selection .emit OP_FIELD;
 285
 286 /*
 287     <integer_expression>                ::= <expression>
 288 */
 289 integer_expression
 290     expression;
 291
 292 /*
 293     <function_call>                     ::= <function_call_generic>
 294 */
 295 function_call
 296     function_call_generic .emit OP_CALL .and .true .emit OP_END;
 297
 298 /*
 299     <function_call_generic>             ::= <function_call_header_with_parameters> ")"
 300                                           | <function_call_header_no_parameters> ")"
 301 */
 302 function_call_generic
 303     function_call_generic_1 .or function_call_generic_2;
 304 function_call_generic_1
 305     function_call_header_with_parameters .and rparen .error RPAREN_EXPECTED;
 306 function_call_generic_2
 307     function_call_header_no_parameters .and rparen .error RPAREN_EXPECTED;
 308
 309 /*
 310     <function_call_header_no_parameters>::= <function_call_header> "void"
 311                                           | <function_call_header>
 312 */
 313 function_call_header_no_parameters
 314     function_call_header .and function_call_header_no_parameters_1;
 315 function_call_header_no_parameters_1
 316     "void" .or .true;
 317
 318 /*
 319     <function_call_header_with_parameters>::= <function_call_header> <assignment_expression>
 320                                             | <function_call_header_with_parameters> ","
 321                                               <assignment_expression>
 322 */
 323 function_call_header_with_parameters
 324     function_call_header .and assignment_expression .and .true .emit OP_END .and
 325     .loop function_call_header_with_parameters_1;
 326 function_call_header_with_parameters_1
 327     comma .and assignment_expression .and .true .emit OP_END;
 328
 329 /*
 330     <function_call_header>              ::= <function_identifier> "("
 331 */
 332 function_call_header
 333     function_identifier .and lparen;
 334
 335 /*
 336     <function_identifier>               ::= <constructor_identifier>
 337                                           | <identifier>
 338
 339 note: <constructor_identifier> has been deleted
 340 */
 341 function_identifier
 342     identifier;
 343
 344 /*
 345     <unary_expression>                  ::= <postfix_expression>
 346                                           | "++" <unary_expression>
 347                                           | "--" <unary_expression>
 348                                           | <unary_operator> <unary_expression>
 349
 350     <unary_operator>                    ::= "+"
 351                                           | "-"
 352                                           | "!"
 353                                           | "~" // reserved
 354 */
 355 unary_expression
 356     postfix_expression .or unary_expression_1 .or unary_expression_2 .or unary_expression_3 .or
 357     unary_expression_4 .or unary_expression_5/* .or unary_expression_6*/;
 358 unary_expression_1
 359     plusplus .and unary_expression .and .true .emit OP_PREINCREMENT;
 360 unary_expression_2
 361     minusminus .and unary_expression .and .true .emit OP_PREDECREMENT;
 362 unary_expression_3
 363     plus .and unary_expression .and .true .emit OP_PLUS;
 364 unary_expression_4
 365     minus .and unary_expression .and .true .emit OP_MINUS;
 366 unary_expression_5
 367     bang .and unary_expression .and .true .emit OP_NOT;
 368 /*unary_expression_6
 369     tilde .and unary_expression .and .true .emit OP_COMPLEMENT;*/
 370
 371 /*
 372     <multiplicative_expression>         ::= <unary_expression>
 373                                           | <multiplicative_expression> "*" <unary_expression>
 374                                           | <multiplicative_expression> "/" <unary_expression>
 375                                           | <multiplicative_expression> "%" <unary_expression> // reserved
 376 */
 377 multiplicative_expression
 378     unary_expression .and .loop multiplicative_expression_1;
 379 multiplicative_expression_1
 380     multiplicative_expression_2 .or multiplicative_expression_3/* .or multiplicative_expression_4*/;
 381 multiplicative_expression_2
 382     star .and unary_expression .and .true .emit OP_MULTIPLY;
 383 multiplicative_expression_3
 384     slash .and unary_expression .and .true .emit OP_DIVIDE;
 385 /*multiplicative_expression_4
 386     percent .and unary_expression .and .true .emit OP_MODULUS;*/
 387
 388 /*
 389     <additive_expression>               ::= <multiplicative_expression>
 390                                           | <additive_expression> "+" <multiplicative_expression>
 391                                           | <additive_expression> "-" <multiplicative_expression>
 392 */
 393 additive_expression
 394     multiplicative_expression .and .loop additive_expression_1;
 395 additive_expression_1
 396     additive_expression_2 .or additive_expression_3;
 397 additive_expression_2
 398     plus .and multiplicative_expression .and .true .emit OP_ADD;
 399 additive_expression_3
 400     minus .and multiplicative_expression .and .true .emit OP_SUBTRACT;
 401
 402 /*
 403     <shift_expression>                  ::= <additive_expression>
 404                                           | <shift_expression> "<<" <additive_expression> // reserved
 405                                           | <shift_expression> ">>" <additive_expression> // reserved
 406 */
 407 shift_expression
 408     additive_expression/* .and .loop shift_expression_1*/;
 409 /*shift_expression_1
 410     shift_expression_2 .or shift_expression_3;*/
 411 /*shift_expression_2
 412     lessless .and additive_expression .and .true .emit OP_LSHIFT;*/
 413 /*shift_expression_3
 414     greatergreater .and additive_expression .and .true .emit OP_RSHIFT;*/
 415
 416 /*
 417     <relational_expression>             ::= <shift_expression>
 418                                           | <relational_expression> "<" <shift_expression>
 419                                           | <relational_expression> ">" <shift_expression>
 420                                           | <relational_expression> "<=" <shift_expression>
 421                                           | <relational_expression> ">=" <shift_expression>
 422 */
 423 relational_expression
 424     shift_expression .and .loop relational_expression_1;
 425 relational_expression_1
 426     relational_expression_2 .or relational_expression_3 .or relational_expression_4 .or
 427     relational_expression_5;
 428 relational_expression_2
 429     lessequals .and shift_expression .and .true .emit OP_LESSEQUAL;
 430 relational_expression_3
 431     greaterequals .and shift_expression .and .true .emit OP_GREATEREQUAL;
 432 relational_expression_4
 433     less .and shift_expression .and .true .emit OP_LESS;
 434 relational_expression_5
 435     greater .and shift_expression .and .true .emit OP_GREATER;
 436
 437 /*
 438     <equality_expression>               ::= <relational_expression>
 439                                           | <equality_expression> "==" <relational_expression>
 440                                           | <equality_expression> "!=" <relational_expression>
 441 */
 442 equality_expression
 443     relational_expression .and .loop equality_expression_1;
 444 equality_expression_1
 445     equality_expression_2 .or equality_expression_3;
 446 equality_expression_2
 447     equalsequals .and relational_expression .and .true .emit OP_EQUAL;
 448 equality_expression_3
 449     bangequals .and relational_expression .and .true .emit OP_NOTEQUAL;
 450
 451 /*
 452     <and_expression>                    ::= <equality_expression>
 453                                           | <and_expression> "&" <equality_expression> // reserved
 454 */
 455 and_expression
 456     equality_expression/* .and .loop and_expression_1*/;
 457 /*and_expression_1
 458     ampersand .and equality_expression .and .true .emit OP_BITAND;*/
 459
 460 /*
 461     <exclusive_or_expression>           ::= <and_expression>
 462                                           | <exclusive_or_expression> "^" <and_expression> // reserved
 463 */
 464 exclusive_or_expression
 465     and_expression/* .and .loop exclusive_or_expression_1*/;
 466 /*exclusive_or_expression_1
 467     caret .and and_expression .and .true .emit OP_BITXOR;*/
 468
 469 /*
 470     <inclusive_or_expression>           ::= <exclusive_or_expression>
 471                                           | <inclusive_or_expression> "|" <exclusive_or_expression> // reserved
 472 */
 473 inclusive_or_expression
 474     exclusive_or_expression/* .and .loop inclusive_or_expression_1*/;
 475 /*inclusive_or_expression_1
 476     bar .and exclusive_or_expression .and .true .emit OP_BITOR;*/
 477
 478 /*
 479     <logical_and_expression>            ::= <inclusive_or_expression>
 480                                           | <logical_and_expression> "&&" <inclusive_or_expression>
 481 */
 482 logical_and_expression
 483     inclusive_or_expression .and .loop logical_and_expression_1;
 484 logical_and_expression_1
 485     ampersandampersand .and inclusive_or_expression .and .true .emit OP_LOGICALAND;
 486
 487 /*
 488     <logical_xor_expression>            ::= <logical_and_expression>
 489                                           | <logical_xor_expression> "^^" <logical_and_expression>
 490 */
 491 logical_xor_expression
 492     logical_and_expression .and .loop logical_xor_expression_1;
 493 logical_xor_expression_1
 494     caretcaret .and logical_and_expression .and .true .emit OP_LOGICALXOR;
 495
 496 /*
 497     <logical_or_expression>             ::= <logical_xor_expression>
 498                                           | <logical_or_expression> "||" <logical_xor_expression>
 499 */
 500 logical_or_expression
 501     logical_xor_expression .and .loop logical_or_expression_1;
 502 logical_or_expression_1
 503     barbar .and logical_xor_expression .and .true .emit OP_LOGICALOR;
 504
 505 /*
 506     <conditional_expression>            ::= <logical_or_expression>
 507                                           | <logical_or_expression> "?" <expression> ":"
 508                                             <conditional_expression>
 509 */
 510 conditional_expression
 511     logical_or_expression .and .loop conditional_expression_1;
 512 conditional_expression_1
 513     question .and expression .and colon .and conditional_expression .and .true .emit OP_SELECT;
 514
 515 /*
 516     <assignment_expression>             ::= <conditional_expression>
 517                                           | <unary_expression> <assignment_operator>
 518                                             <assignment_expression>
 519
 520     <assignment_operator>               ::= "="
 521                                           | "*="
 522                                           | "/="
 523                                           | "+="
 524                                           | "-="
 525                                           | "%=" // reserved
 526                                           | "<<=" // reserved
 527                                           | ">>=" // reserved
 528                                           | "&=" // reserved
 529                                           | "^=" // reserved
 530                                           | "|=" // reserved
 531 */
 532 assignment_expression
 533     assignment_expression_1 .or assignment_expression_2 .or assignment_expression_3 .or
 534     assignment_expression_4 .or assignment_expression_5/* .or assignment_expression_6 .or
 535     assignment_expression_7 .or assignment_expression_8 .or assignment_expression_9 .or
 536     assignment_expression_10 .or assignment_expression_11*/ .or conditional_expression;
 537 assignment_expression_1
 538     unary_expression .and equals .and assignment_expression .and .true .emit OP_ASSIGN;
 539 assignment_expression_2
 540     unary_expression .and starequals .and assignment_expression .and .true .emit OP_MULASSIGN;
 541 assignment_expression_3
 542     unary_expression .and slashequals .and assignment_expression .and .true .emit OP_DIVASSIGN;
 543 assignment_expression_4
 544     unary_expression .and plusequals .and assignment_expression .and .true .emit OP_ADDASSIGN;
 545 assignment_expression_5
 546     unary_expression .and minusequals .and assignment_expression .and .true .emit OP_SUBASSIGN;
 547 /*assignment_expression_6
 548     unary_expression .and percentequals .and assignment_expression .and .true .emit OP_MODASSIGN;*/
 549 /*assignment_expression_7
 550     unary_expression .and lesslessequals .and assignment_expression .and .true .emit OP_LSHASSIGN;*/
 551 /*assignment_expression_8
 552     unary_expression .and greatergreaterequals .and assignment_expression .and
 553     .true .emit OP_RSHASSIGN;*/
 554 /*assignment_expression_9
 555     unary_expression .and ampersandequals .and assignment_expression .and .true .emit OP_ANDASSIGN;*/
 556 /*assignment_expression_10
 557     unary_expression .and caretequals .and assignment_expression .and .true .emit OP_XORASSIGN;*/
 558 /*assignment_expression_11
 559     unary_expression .and barequals .and assignment_expression .and .true .emit OP_ORASSIGN;*/
 560
 561 /*
 562     <expression>                        ::= <assignment_expression>
 563                                           | <expression> "," <assignment_expression>
 564 */
 565 expression
 566     assignment_expression .and .loop expression_1;
 567 expression_1
 568     comma .and assignment_expression .and .true .emit OP_SEQUENCE;
 569
 570 /*
 571     <constant_expression>               ::= <conditional_expression>
 572 */
 573 constant_expression
 574     conditional_expression .and .true .emit OP_END;
 575
 576 /*
 577     <declaration>                       ::= <function_prototype> ";"
 578                                           | <init_declarator_list> ";"
 579 */
 580 declaration
 581     declaration_1 .or declaration_2;
 582 declaration_1
 583     function_prototype .emit DECLARATION_FUNCTION_PROTOTYPE .and semicolon;
 584 declaration_2
 585     init_declarator_list .emit DECLARATION_INIT_DECLARATOR_LIST .and semicolon;
 586
 587 /*
 588     <function_prototype>                ::= <function_header> "void" ")"
 589                                           | <function_declarator> ")"
 590 */
 591 function_prototype
 592     function_prototype_1 .or function_prototype_2;
 593 function_prototype_1
 594     function_header .and "void" .and rparen .error RPAREN_EXPECTED .emit PARAMETER_NONE;
 595 function_prototype_2
 596     function_declarator .and rparen .error RPAREN_EXPECTED .emit PARAMETER_NONE;
 597
 598 /*
 599     <function_declarator>               ::= <function_header>
 600                                           | <function_header_with_parameters>
 601 */
 602 function_declarator
 603     function_header_with_parameters .or function_header;
 604
 605 /*
 606     <function_header_with_parameters>   ::= <function_header> <parameter_declaration>
 607                                           | <function_header_with_parameters> ","
 608                                             <parameter_declaration>
 609 */
 610 function_header_with_parameters
 611     function_header .and parameter_declaration .and .loop function_header_with_parameters_1;
 612 function_header_with_parameters_1
 613     comma .and parameter_declaration;
 614
 615 /*
 616     <function_header>                   ::= <fully_specified_type> <identifier> "("
 617 */
 618 function_header
 619     function_header_nospace .or function_header_space;
 620 function_header_space
 621     fully_specified_type_space .and space .and function_decl_identifier .and lparen;
 622 function_header_nospace
 623     fully_specified_type_nospace .and function_decl_identifier .and lparen;
 624
 625 /*
 626     <function_decl_identifier>          ::= "__constructor"
 627                                           | <__operator>
 628                                           | <identifier>
 629
 630 note: this is an extension to the standard language specification - normally slang disallows
 631       operator and constructor prototypes and definitions
 632 */
 633 function_decl_identifier
 634     .if (parsing_builtin != 0) __operator .emit FUNCTION_OPERATOR .or
 635     .if (parsing_builtin != 0) "__constructor" .emit FUNCTION_CONSTRUCTOR .or
 636     identifier .emit FUNCTION_ORDINARY;
 637
 638 /*
 639     <__operator>                        ::= "__operator" <overriden_op>
 640
 641 note: this is an extension to the standard language specification - normally slang disallows
 642       operator prototypes and definitions
 643 */
 644 __operator
 645     "__operator" .and overriden_operator .error INVALID_OPERATOR_OVERRIDE;
 646
 647 /*
 648     <overriden_op>                      ::= "="
 649                                           | "+="
 650                                           | "-="
 651                                           | "*="
 652                                           | "/="
 653                                           | "%=" // reserved
 654                                           | "<<=" // reserved
 655                                           | ">>=" // reserved
 656                                           | "&=" // reserved
 657                                           | "^=" // reserved
 658                                           | "|=" // reserved
 659                                           | "^^"
 660                                           | "|" // reserved
 661                                           | "^" // reserved
 662                                           | "&" // reserved
 663                                           | "=="
 664                                           | "!="
 665                                           | "<"
 666                                           | ">"
 667                                           | "<="
 668                                           | ">="
 669                                           | "<<" // reserved
 670                                           | ">>" // reserved
 671                                           | "*"
 672                                           | "/"
 673                                           | "%" // reserved
 674                                           | "++"
 675                                           | "--"
 676                                           | "+"
 677                                           | "-"
 678                                           | "~" // reserved
 679                                           | "!"
 680
 681 note: this is an extension to the standard language specification - normally slang disallows
 682       operator prototypes and definitions
 683 */
 684 overriden_operator
 685     plusplus .emit OPERATOR_INCREMENT .or
 686     plusequals .emit OPERATOR_ADDASSIGN .or
 687     plus .emit OPERATOR_PLUS .or
 688     minusminus .emit OPERATOR_DECREMENT .or
 689     minusequals .emit OPERATOR_SUBASSIGN .or
 690     minus .emit OPERATOR_MINUS .or
 691     bang .emit OPERATOR_NOT .or
 692     starequals .emit OPERATOR_MULASSIGN .or
 693     star .emit OPERATOR_MULTIPLY .or
 694     slashequals .emit OPERATOR_DIVASSIGN .or
 695     slash .emit OPERATOR_DIVIDE .or
 696     lessequals .emit OPERATOR_LESSEQUAL .or
 697     /*lesslessequals .emit OPERATOR_LSHASSIGN .or*/
 698     /*lessless .emit OPERATOR_LSHIFT .or*/
 699     less .emit OPERATOR_LESS .or
 700     greaterequals .emit OPERATOR_GREATEREQUAL .or
 701     /*greatergreaterequals .emit OPERATOR_RSHASSIGN .or*/
 702     /*greatergreater .emit OPERATOR_RSHIFT .or*/
 703     greater .emit OPERATOR_GREATER .or
 704     /*percentequals .emit OPERATOR_MODASSIGN .or*/
 705     /*percent .emit OPERATOR_MODULUS .or*/
 706     /*ampersandequals .emit OPERATOR_ANDASSIGN */
 707     /*ampersand .emit OPERATOR_BITAND .or*/
 708     /*barequals .emit OPERATOR_ORASSIGN .or*/
 709     /*bar .emit OPERATOR_BITOR .or*/
 710     /*tilde .emit OPERATOR_COMPLEMENT .or*/
 711     /*caretequals .emit OPERATOR_XORASSIGN .or*/
 712     caretcaret .emit OPERATOR_LOGICALXOR /*.or
 713     caret .emit OPERATOR_BITXOR*/;
 714
 715 /*
 716     <parameter_declarator>              ::= <type_specifier> <identifier>
 717                                           | <type_specifier> <identifier> "[" <constant_expression>
 718                                             "]"
 719 */
 720 parameter_declarator
 721     parameter_declarator_nospace .or parameter_declarator_space;
 722 parameter_declarator_nospace
 723     type_specifier_nospace .and identifier .and parameter_declarator_1;
 724 parameter_declarator_space
 725     type_specifier_space .and space .and identifier .and parameter_declarator_1;
 726 parameter_declarator_1
 727     parameter_declarator_2 .emit PARAMETER_ARRAY_PRESENT .or
 728     .true .emit PARAMETER_ARRAY_NOT_PRESENT;
 729 parameter_declarator_2
 730     lbracket .and constant_expression .and rbracket;
 731
 732 /*
 733     <parameter_declaration>             ::= <type_qualifier> <parameter_qualifier>
 734                                             <parameter_declarator>
 735                                           | <type_qualifier> <parameter_qualifier>
 736                                             <parameter_type_specifier>
 737                                           | <parameter_qualifier> <parameter_declarator>
 738                                           | <parameter_qualifier> <parameter_type_specifier>
 739 */
 740 parameter_declaration
 741     parameter_declaration_1 .emit PARAMETER_NEXT;
 742 parameter_declaration_1
 743     parameter_declaration_2 .or parameter_declaration_3;
 744 parameter_declaration_2
 745     type_qualifier .and space .and parameter_qualifier .and parameter_declaration_4;
 746 parameter_declaration_3
 747     parameter_qualifier .emit TYPE_QUALIFIER_NONE .and parameter_declaration_4;
 748 parameter_declaration_4
 749     parameter_declarator .or parameter_type_specifier;
 750
 751 /*
 752     <parameter_qualifier>               ::= "in"
 753                                           | "out"
 754                                           | "inout"
 755                                           | ""
 756 */
 757 parameter_qualifier
 758     parameter_qualifier_1 .or .true .emit PARAM_QUALIFIER_IN;
 759 parameter_qualifier_1
 760     parameter_qualifier_2 .and space;
 761 parameter_qualifier_2
 762     "in" .emit PARAM_QUALIFIER_IN .or
 763     "out" .emit PARAM_QUALIFIER_OUT .or
 764     "inout" .emit PARAM_QUALIFIER_INOUT;
 765
 766 /*
 767     <parameter_type_specifier>          ::= <type_specifier>
 768                                           | <type_specifier> "[" <constant_expression> "]"
 769 */
 770 parameter_type_specifier
 771     parameter_type_specifier_1 .and .true .emit '\0' .and parameter_type_specifier_2;
 772 parameter_type_specifier_1
 773     type_specifier_nospace .or type_specifier_space;
 774 parameter_type_specifier_2
 775     parameter_type_specifier_3 .emit PARAMETER_ARRAY_PRESENT .or
 776     .true .emit PARAMETER_ARRAY_NOT_PRESENT;
 777 parameter_type_specifier_3
 778     lbracket .and constant_expression .and rbracket;
 779
 780 /*
 781     <init_declarator_list>              ::= <single_declaration>
 782                                           | <init_declarator_list> "," <identifier>
 783                                           | <init_declarator_list> "," <identifier> "[" "]"
 784                                           | <init_declarator_list> "," <identifier> "["
 785                                             <constant_expression> "]"
 786                                           | <init_declarator_list> "," <identifier> "="
 787                                             <initializer>
 788 */
 789 init_declarator_list
 790     single_declaration .and .loop init_declarator_list_1 .emit DECLARATOR_NEXT .and
 791     .true .emit DECLARATOR_NONE;
 792 init_declarator_list_1
 793     comma .and identifier .emit VARIABLE_IDENTIFIER .and init_declarator_list_2;
 794 init_declarator_list_2
 795     init_declarator_list_3 .or init_declarator_list_4 .or .true .emit VARIABLE_NONE;
 796 init_declarator_list_3
 797     equals .and initializer .emit VARIABLE_INITIALIZER;
 798 init_declarator_list_4
 799     lbracket .and init_declarator_list_5 .and rbracket;
 800 init_declarator_list_5
 801     constant_expression .emit VARIABLE_ARRAY_EXPLICIT .or .true .emit VARIABLE_ARRAY_UNKNOWN;
 802
 803 /*
 804     <single_declaration>                ::= <fully_specified_type>
 805                                           | <fully_specified_type> <identifier>
 806                                           | <fully_specified_type> <identifier> "[" "]"
 807                                           | <fully_specified_type> <identifier> "["
 808                                             <constant_expression> "]"
 809                                           | <fully_specified_type> <identifier> "=" <initializer>
 810 */
 811 single_declaration
 812     single_declaration_nospace .or single_declaration_space;
 813 single_declaration_space
 814     fully_specified_type_space .and single_declaration_space_1;
 815 single_declaration_nospace
 816     fully_specified_type_nospace .and single_declaration_nospace_1;
 817 single_declaration_space_1
 818     single_declaration_space_2 .emit VARIABLE_IDENTIFIER .or .true .emit VARIABLE_NONE;
 819 single_declaration_nospace_1
 820     single_declaration_nospace_2 .emit VARIABLE_IDENTIFIER .or .true .emit VARIABLE_NONE;
 821 single_declaration_space_2
 822     space .and identifier .and single_declaration_3;
 823 single_declaration_nospace_2
 824     identifier .and single_declaration_3;
 825 single_declaration_3
 826     single_declaration_4 .or single_declaration_5 .or .true .emit VARIABLE_NONE;
 827 single_declaration_4
 828     equals .and initializer .emit VARIABLE_INITIALIZER;
 829 single_declaration_5
 830     lbracket .and single_declaration_6 .and rbracket;
 831 single_declaration_6
 832     constant_expression .emit VARIABLE_ARRAY_EXPLICIT .or .true .emit VARIABLE_ARRAY_UNKNOWN;
 833
 834 /*
 835     <fully_specified_type>              ::= <type_specifier>
 836                                           | <type_qualifier> <type_specifier>
 837 */
 838 fully_specified_type_space
 839     fully_specified_type_1 .and type_specifier_space;
 840 fully_specified_type_nospace
 841     fully_specified_type_1 .and type_specifier_nospace;
 842 fully_specified_type_1
 843     fully_specified_type_2 .or .true .emit TYPE_QUALIFIER_NONE;
 844 fully_specified_type_2
 845     type_qualifier .and space;
 846
 847 /*
 848     <type_qualifier>                    ::= "const"
 849                                           | "attribute" // Vertex only.
 850                                           | "varying"
 851                                           | "uniform"
 852                                                                                   | "__fixed_output"
 853                                                                                   | "__fixed_input"
 854
 855 note: this is an extension to the standard language specification - normally slang disallows
 856       __fixed_output and __fixed_input type qualifiers
 857 */
 858 type_qualifier
 859     "const" .emit TYPE_QUALIFIER_CONST .or
 860     .if (shader_type == 2) "attribute" .emit TYPE_QUALIFIER_ATTRIBUTE .or
 861     "varying" .emit TYPE_QUALIFIER_VARYING .or
 862     "uniform" .emit TYPE_QUALIFIER_UNIFORM .or
 863         .if (parsing_builtin != 0) "__fixed_output" .emit TYPE_QUALIFIER_FIXEDOUTPUT .or
 864         .if (parsing_builtin != 0) "__fixed_input" .emit TYPE_QUALIFIER_FIXEDINPUT;
 865
 866 /*
 867     <type_specifier>                    ::= "void"
 868                                           | "float"
 869                                           | "int"
 870                                           | "bool"
 871                                           | "vec2"
 872                                           | "vec3"
 873                                           | "vec4"
 874                                           | "bvec2"
 875                                           | "bvec3"
 876                                           | "bvec4"
 877                                           | "ivec2"
 878                                           | "ivec3"
 879                                           | "ivec4"
 880                                           | "mat2"
 881                                           | "mat3"
 882                                           | "mat4"
 883                                           | "sampler1D"
 884                                           | "sampler2D"
 885                                           | "sampler3D"
 886                                           | "samplerCube"
 887                                           | "sampler1DShadow"
 888                                           | "sampler2DShadow"
 889                                           | "sampler2DRect"
 890                                           | "sampler2DRectShadow"
 891                                           | <struct_specifier>
 892                                           | <type_name>
 893 */
 894 type_specifier_space
 895     "void" .emit TYPE_SPECIFIER_VOID .or
 896     "float" .emit TYPE_SPECIFIER_FLOAT .or
 897     "int" .emit TYPE_SPECIFIER_INT .or
 898     "bool" .emit TYPE_SPECIFIER_BOOL .or
 899     "vec2" .emit TYPE_SPECIFIER_VEC2 .or
 900     "vec3" .emit TYPE_SPECIFIER_VEC3 .or
 901     "vec4" .emit TYPE_SPECIFIER_VEC4 .or
 902     "bvec2" .emit TYPE_SPECIFIER_BVEC2 .or
 903     "bvec3" .emit TYPE_SPECIFIER_BVEC3 .or
 904     "bvec4" .emit TYPE_SPECIFIER_BVEC4 .or
 905     "ivec2" .emit TYPE_SPECIFIER_IVEC2 .or
 906     "ivec3" .emit TYPE_SPECIFIER_IVEC3 .or
 907     "ivec4" .emit TYPE_SPECIFIER_IVEC4 .or
 908     "mat2" .emit TYPE_SPECIFIER_MAT2 .or
 909     "mat3" .emit TYPE_SPECIFIER_MAT3 .or
 910     "mat4" .emit TYPE_SPECIFIER_MAT4 .or
 911     "sampler1D" .emit TYPE_SPECIFIER_SAMPLER1D .or
 912     "sampler2D" .emit TYPE_SPECIFIER_SAMPLER2D .or
 913     "sampler3D" .emit TYPE_SPECIFIER_SAMPLER3D .or
 914     "samplerCube" .emit TYPE_SPECIFIER_SAMPLERCUBE .or
 915     "sampler1DShadow" .emit TYPE_SPECIFIER_SAMPLER1DSHADOW .or
 916     "sampler2DShadow" .emit TYPE_SPECIFIER_SAMPLER2DSHADOW .or
 917     "sampler2DRect" .emit TYPE_SPECIFIER_SAMPLER2DRECT .or
 918     "sampler2DRectShadow" .emit TYPE_SPECIFIER_SAMPLER2DRECTSHADOW .or
 919     type_name .emit TYPE_SPECIFIER_TYPENAME;
 920 type_specifier_nospace
 921     struct_specifier .emit TYPE_SPECIFIER_STRUCT;
 922
 923 /*
 924     <struct_specifier>                  ::= "struct" <identifier> "{" <struct_declaration_list> "}"
 925                                           | "struct" "{" <struct_declaration_list> "}"
 926 */
 927 struct_specifier
 928     "struct" .and struct_specifier_1 .and optional_space .and lbrace .error LBRACE_EXPECTED .and
 929     struct_declaration_list .and rbrace .emit FIELD_NONE;
 930 struct_specifier_1
 931     struct_specifier_2 .or .true .emit '\0';
 932 struct_specifier_2
 933     space .and identifier;
 934
 935 /*
 936     <struct_declaration_list>           ::= <struct_declaration>
 937                                           | <struct_declaration_list> <struct_declaration>
 938 */
 939 struct_declaration_list
 940     struct_declaration .and .loop struct_declaration .emit FIELD_NEXT;
 941
 942 /*
 943     <struct_declaration>                ::= <type_specifier> <struct_declarator_list> ";"
 944 */
 945 struct_declaration
 946     struct_declaration_nospace .or struct_declaration_space;
 947 struct_declaration_space
 948     type_specifier_space .and space .and struct_declarator_list .and semicolon .emit FIELD_NONE;
 949 struct_declaration_nospace
 950     type_specifier_nospace .and struct_declarator_list .and semicolon .emit FIELD_NONE;
 951
 952 /*
 953     <struct_declarator_list>            ::= <struct_declarator>
 954                                           | <struct_declarator_list> "," <struct_declarator>
 955 */
 956 struct_declarator_list
 957     struct_declarator .and .loop struct_declarator_list_1 .emit FIELD_NEXT;
 958 struct_declarator_list_1
 959     comma .and struct_declarator;
 960
 961 /*
 962     <struct_declarator>                 ::= <identifier>
 963                                           | <identifier> "[" <constant_expression> "]"
 964 */
 965 struct_declarator
 966     identifier .and struct_declarator_1;
 967 struct_declarator_1
 968     struct_declarator_2 .emit FIELD_ARRAY .or .true .emit FIELD_NONE;
 969 struct_declarator_2
 970     lbracket .and constant_expression .and rbracket;
 971
 972 /*
 973     <initializer>                       ::= <assignment_expression>
 974 */
 975 initializer
 976     assignment_expression .and .true .emit OP_END;
 977
 978 /*
 979     <declaration_statement>             ::= <declaration>
 980 */
 981 declaration_statement
 982     declaration;
 983
 984 /*
 985     <statement>                         ::= <compound_statement>
 986                                           | <simple_statement>
 987 */
 988 statement
 989     compound_statement .or simple_statement;
 990 statement_space
 991     compound_statement .or statement_space_1;
 992 statement_space_1
 993     space .and simple_statement;
 994
 995 /*
 996     <simple_statement>                  ::= <__asm_statement>
 997                                           | <selection_statement>
 998                                           | <iteration_statement>
 999                                           | <jump_statement>
1000                                           | <expression_statement>
1001                                           | <declaration_statement>
1002
1003 note: this is an extension to the standard language specification - normally slang disallows
1004       use of __asm statements
1005 */
1006 simple_statement
1007     .if (parsing_builtin != 0) __asm_statement .emit OP_ASM .or
1008     selection_statement .or
1009     iteration_statement .or
1010     jump_statement .or
1011     expression_statement .emit OP_EXPRESSION .or
1012     declaration_statement .emit OP_DECLARE;
1013
1014 /*
1015     <compound_statement>                ::= "{" "}"
1016                                           | "{" <statement_list> "}"
1017 */
1018 compound_statement
1019     compound_statement_1 .emit OP_BLOCK_BEGIN_NEW_SCOPE .and .true .emit OP_END;
1020 compound_statement_1
1021     compound_statement_2 .or compound_statement_3;
1022 compound_statement_2
1023     lbrace .and rbrace;
1024 compound_statement_3
1025     lbrace .and statement_list .and rbrace;
1026
1027 /*
1028     <statement_no_new_scope>            ::= <compound_statement_no_new_scope>
1029                                           | <simple_statement>
1030 */
1031 statement_no_new_scope
1032     compound_statement_no_new_scope .or simple_statement;
1033
1034 /*
1035     <compound_statement_no_new_scope>   ::= "{" "}"
1036                                           | "{" <statement_list> "}"
1037 */
1038 compound_statement_no_new_scope
1039     compound_statement_no_new_scope_1 .emit OP_BLOCK_BEGIN_NO_NEW_SCOPE .and .true .emit OP_END;
1040 compound_statement_no_new_scope_1
1041     compound_statement_no_new_scope_2 .or compound_statement_no_new_scope_3;
1042 compound_statement_no_new_scope_2
1043     lbrace .and rbrace;
1044 compound_statement_no_new_scope_3
1045     lbrace .and statement_list .and rbrace;
1046
1047 /*
1048     <statement_list>                    ::= <statement>
1049                                           | <statement_list> <statement>
1050 */
1051 statement_list
1052     statement .and .loop statement;
1053
1054 /*
1055     <expression_statement>              ::= ";"
1056                                           | <expression> ";"
1057 */
1058 expression_statement
1059     expression_statement_1 .or expression_statement_2;
1060 expression_statement_1
1061     semicolon .emit OP_PUSH_VOID .emit OP_END;
1062 expression_statement_2
1063     expression .and semicolon .emit OP_END;
1064
1065 /*
1066     <selection_statement>               ::= "if" "(" <expression> ")" <selection_rest_statement>
1067 */
1068 selection_statement
1069     "if" .emit OP_IF .and lparen .error LPAREN_EXPECTED .and expression .and
1070     rparen .error RPAREN_EXPECTED .emit OP_END .and selection_rest_statement;
1071
1072 /*
1073     <selection_rest_statement>          ::= <statement> "else" <statement>
1074                                           | <statement>
1075 */
1076 selection_rest_statement
1077     statement .and selection_rest_statement_1;
1078 selection_rest_statement_1
1079     selection_rest_statement_2 .or .true .emit OP_EXPRESSION .emit OP_PUSH_VOID .emit OP_END;
1080 selection_rest_statement_2
1081     "else" .and optional_space .and statement;
1082
1083 /*
1084     <condition>                         ::= <expression>
1085                                           | <fully_specified_type> <identifier> "=" <initializer>
1086
1087 note: if <condition_1> is executed, the emit format must match <declaration> emit format
1088 */
1089 condition
1090     condition_1 .emit OP_DECLARE .emit DECLARATION_INIT_DECLARATOR_LIST .or
1091     condition_3 .emit OP_EXPRESSION;
1092 condition_1
1093     condition_1_nospace .or condition_1_space;
1094 condition_1_nospace
1095     fully_specified_type_nospace .and condition_2;
1096 condition_1_space
1097     fully_specified_type_space .and space .and condition_2;
1098 condition_2
1099     identifier .emit VARIABLE_IDENTIFIER .and equals .emit VARIABLE_INITIALIZER .and
1100     initializer .and .true .emit DECLARATOR_NONE;
1101 condition_3
1102     expression .and .true .emit OP_END;
1103
1104 /*
1105     <iteration_statement>               ::= "while" "(" <condition> ")" <statement>
1106                                           | "do" <statement> "while" "(" <expression> ")" ";"
1107                                           | "for" "(" <for_init_statement> <for_rest_statement> ")"
1108                                             <statement_no_new_scope>
1109 */
1110 iteration_statement
1111     iteration_statement_1 .or iteration_statement_2 .or iteration_statement_3;
1112 iteration_statement_1
1113     "while" .emit OP_WHILE .and lparen .error LPAREN_EXPECTED .and condition .and
1114     rparen .error RPAREN_EXPECTED .and statement;
1115 iteration_statement_2
1116     "do" .emit OP_DO .and statement_space .and "while" .and lparen .error LPAREN_EXPECTED .and
1117     expression .and rparen .error RPAREN_EXPECTED .emit OP_END .and semicolon;
1118 iteration_statement_3
1119     "for" .emit OP_FOR .and lparen .error LPAREN_EXPECTED .and for_init_statement .and
1120     for_rest_statement .and rparen .error RPAREN_EXPECTED .and statement_no_new_scope;
1121
1122 /*
1123     <for_init_statement>                ::= <expression_statement>
1124                                           | <declaration_statement>
1125 */
1126 for_init_statement
1127     expression_statement .emit OP_EXPRESSION .or declaration_statement .emit OP_DECLARE;
1128
1129 /*
1130     <conditionopt>                      ::= <condition>
1131                                           | ""
1132
1133 note: <conditionopt> is used only by "for" statement - if <condition> is ommitted, parser
1134       simulates default behaviour, that is simulates "true" expression
1135 */
1136 conditionopt
1137     condition .or
1138     .true .emit OP_EXPRESSION .emit OP_PUSH_BOOL .emit 2 .emit '1' .emit '\0' .emit OP_END;
1139
1140 /*
1141     <for_rest_statement>                ::= <conditionopt> ";"
1142                                           | <conditionopt> ";" <expression>
1143 */
1144 for_rest_statement
1145     conditionopt .and semicolon .and for_rest_statement_1;
1146 for_rest_statement_1
1147     for_rest_statement_2 .or .true .emit OP_PUSH_VOID .emit OP_END;
1148 for_rest_statement_2
1149     expression .and .true .emit OP_END;
1150
1151 /*
1152     <jump_statement>                    ::= "continue" ";"
1153                                           | "break" ";"
1154                                           | "return" ";"
1155                                           | "return" <expression> ";"
1156                                           | "discard" ";" // Fragment shader only.
1157 */
1158 jump_statement
1159     jump_statement_1 .or jump_statement_2 .or jump_statement_3 .or jump_statement_4 .or
1160     .if (shader_type == 1) jump_statement_5;
1161 jump_statement_1
1162     "continue" .and semicolon .emit OP_CONTINUE;
1163 jump_statement_2
1164     "break" .and semicolon .emit OP_BREAK;
1165 jump_statement_3
1166     "return" .emit OP_RETURN .and optional_space .and expression .and semicolon .emit OP_END;
1167 jump_statement_4
1168     "return" .emit OP_RETURN .and semicolon .emit OP_PUSH_VOID .emit OP_END;
1169 jump_statement_5
1170     "discard" .and semicolon .emit OP_DISCARD;
1171
1172 /*
1173     <__asm_statement>                   ::= "__asm" <identifier> <asm_arguments> ";"
1174
1175 note: this is an extension to the standard language specification - normally slang disallows
1176       __asm statements
1177 */
1178 __asm_statement
1179     "__asm" .and space .and identifier .and space .and asm_arguments .and semicolon .emit OP_END;
1180
1181 /*
1182     <asm_arguments>                     ::= <asm_argument>
1183                                           | <asm_arguments> "," <asm_argument>
1184
1185 note: this is an extension to the standard language specification - normally slang disallows
1186       __asm statements
1187 */
1188 asm_arguments
1189     asm_argument .and .true .emit OP_END .and .loop asm_arguments_1;
1190 asm_arguments_1
1191     comma .and asm_argument .and .true .emit OP_END;
1192
1193 /*
1194     <asm_argument>                      ::= <variable_identifier>
1195                                           | <floatconstant>
1196
1197 note: this is an extension to the standard language specification - normally slang disallows
1198       __asm statements
1199 */
1200 asm_argument
1201     var_with_field .or
1202     variable_identifier .or
1203     floatconstant;
1204
1205 var_with_field
1206     variable_identifier .and dot .and field_selection .emit OP_FIELD;
1207
1208 /*
1209     <translation_unit>                  ::= <external_declaration>
1210                                           | <translation_unit> <external_declaration>
1211 */
1212 translation_unit
1213     optional_space .emit REVISION .and external_declaration .error INVALID_EXTERNAL_DECLARATION .and
1214     .loop external_declaration .and optional_space .and
1215     '\0' .error INVALID_EXTERNAL_DECLARATION .emit EXTERNAL_NULL;
1216
1217 /*
1218     <external_declaration>              ::= <function_definition>
1219                                           | <declaration>
1220 */
1221 external_declaration
1222     function_definition .emit EXTERNAL_FUNCTION_DEFINITION .or
1223     declaration .emit EXTERNAL_DECLARATION;
1224
1225 /*
1226     <function_definition>               :: <function_prototype> <compound_statement_no_new_scope>
1227 */
1228 function_definition
1229     function_prototype .and compound_statement_no_new_scope;
1230
1231 /* helper rulez, not part of the official language syntax */
1232
1233 digit_oct
1234     '0'-'7';
1235
1236 digit_dec
1237     '0'-'9';
1238
1239 digit_hex
1240     '0'-'9' .or 'A'-'F' .or 'a'-'f';
1241
1242 id_character_first
1243     'a'-'z' .or 'A'-'Z' .or '_';
1244
1245 id_character_next
1246     id_character_first .or digit_dec;
1247
1248 identifier
1249     id_character_first .emit * .and .loop id_character_next .emit * .and .true .emit '\0';
1250
1251 float
1252     float_1 .or float_2;
1253 float_1
1254     float_fractional_constant .and float_optional_exponent_part;
1255 float_2
1256     float_digit_sequence .and .true .emit '\0' .and float_exponent_part;
1257
1258 float_fractional_constant
1259     float_fractional_constant_1 .or float_fractional_constant_2 .or float_fractional_constant_3;
1260 float_fractional_constant_1
1261     float_digit_sequence .and '.' .and float_digit_sequence;
1262 float_fractional_constant_2
1263     float_digit_sequence .and '.' .and .true .emit '\0';
1264 float_fractional_constant_3
1265     '.' .emit '\0' .and float_digit_sequence;
1266
1267 float_optional_exponent_part
1268     float_exponent_part .or .true .emit '\0';
1269
1270 float_digit_sequence
1271     digit_dec .emit * .and .loop digit_dec .emit * .and .true .emit '\0';
1272
1273 float_exponent_part
1274     float_exponent_part_1 .or float_exponent_part_2;
1275 float_exponent_part_1
1276     'e' .and float_optional_sign .and float_digit_sequence;
1277 float_exponent_part_2
1278     'E' .and float_optional_sign .and float_digit_sequence;
1279
1280 float_optional_sign
1281     float_sign .or .true;
1282
1283 float_sign
1284     '+' .or '-' .emit '-';
1285
1286 integer
1287     integer_hex .or integer_oct .or integer_dec;
1288
1289 integer_hex
1290     '0' .and integer_hex_1 .emit 0x10 .and digit_hex .emit * .and .loop digit_hex .emit * .and
1291     .true .emit '\0';
1292 integer_hex_1
1293     'x' .or 'X';
1294
1295 integer_oct
1296     '0' .emit 8 .emit * .and .loop digit_oct .emit * .and .true .emit '\0';
1297
1298 integer_dec
1299     digit_dec .emit 10 .emit * .and .loop digit_dec .emit * .and .true .emit '\0';
1300
1301 boolean
1302     "true" .emit 2 .emit '1' .emit '\0' .or
1303     "false" .emit 2 .emit '0' .emit '\0';
1304
1305 type_name
1306     identifier;
1307
1308 field_selection
1309     identifier;
1310
1311 floatconstant
1312     float .emit OP_PUSH_FLOAT;
1313
1314 intconstant
1315     integer .emit OP_PUSH_INT;
1316
1317 boolconstant
1318     boolean .emit OP_PUSH_BOOL;
1319
1320 optional_space
1321     .loop single_space;
1322
1323 space
1324     single_space .and .loop single_space;
1325
1326 single_space
1327     white_char .or c_style_comment_block .or cpp_style_comment_block;
1328
1329 white_char
1330     ' ' .or '\t' .or new_line .or '\v' .or '\f';
1331
1332 new_line
1333     cr_lf .or lf_cr .or '\n' .or '\r';
1334
1335 cr_lf
1336     '\r' .and '\n';
1337
1338 lf_cr
1339     '\n' .and '\r';
1340
1341 c_style_comment_block
1342     '/' .and '*' .and c_style_comment_rest;
1343
1344 c_style_comment_rest
1345     .loop c_style_comment_char_no_star .and c_style_comment_rest_1;
1346 c_style_comment_rest_1
1347     c_style_comment_end .or c_style_comment_rest_2;
1348 c_style_comment_rest_2
1349     '*' .and c_style_comment_rest;
1350
1351 c_style_comment_char_no_star
1352     '\x2B'-'\xFF' .or '\x01'-'\x29';
1353
1354 c_style_comment_end
1355     '*' .and '/';
1356
1357 cpp_style_comment_block
1358     '/' .and '/' .and cpp_style_comment_block_1;
1359 cpp_style_comment_block_1
1360     cpp_style_comment_block_2 .or cpp_style_comment_block_3;
1361 cpp_style_comment_block_2
1362     .loop cpp_style_comment_char .and new_line;
1363 cpp_style_comment_block_3
1364     .loop cpp_style_comment_char;
1365
1366 cpp_style_comment_char
1367     '\x0E'-'\xFF' .or '\x01'-'\x09' .or '\x0B'-'\x0C';
1368
1369 /* lexical rulez */
1370
1371 /*ampersand
1372     optional_space .and '&' .and optional_space;*/
1373
1374 ampersandampersand
1375     optional_space .and '&' .and '&' .and optional_space;
1376
1377 /*ampersandequals
1378     optional_space .and '&' .and '=' .and optional_space;*/
1379
1380 /*bar
1381     optional_space .and '|' .and optional_space;*/
1382
1383 barbar
1384     optional_space .and '|' .and '|' .and optional_space;
1385
1386 /*barequals
1387     optional_space .and '|' .and '=' .and optional_space;*/
1388
1389 bang
1390     optional_space .and '!' .and optional_space;
1391
1392 bangequals
1393     optional_space .and '!' .and '=' .and optional_space;
1394
1395 /*caret
1396     optional_space .and '^' .and optional_space;*/
1397
1398 caretcaret
1399     optional_space .and '^' .and '^' .and optional_space;
1400
1401 /*caretequals
1402     optional_space .and '^' .and '=' .and optional_space;*/
1403
1404 colon
1405     optional_space .and ':' .and optional_space;
1406
1407 comma
1408     optional_space .and ',' .and optional_space;
1409
1410 dot
1411     optional_space .and '.' .and optional_space;
1412
1413 equals
1414     optional_space .and '=' .and optional_space;
1415
1416 equalsequals
1417     optional_space .and '=' .and '=' .and optional_space;
1418
1419 greater
1420     optional_space .and '>' .and optional_space;
1421
1422 greaterequals
1423     optional_space .and '>' .and '=' .and optional_space;
1424
1425 /*greatergreater
1426     optional_space .and '>' .and '>' .and optional_space;*/
1427
1428 /*greatergreaterequals
1429     optional_space .and '>' .and '>' .and '=' .and optional_space;*/
1430
1431 lbrace
1432     optional_space .and '{' .and optional_space;
1433
1434 lbracket
1435     optional_space .and '[' .and optional_space;
1436
1437 less
1438     optional_space .and '<' .and optional_space;
1439
1440 lessequals
1441     optional_space .and '<' .and '=' .and optional_space;
1442
1443 /*lessless
1444     optional_space .and '<' .and '<' .and optional_space;*/
1445
1446 /*lesslessequals
1447     optional_space .and '<' .and '<' .and '=' .and optional_space;*/
1448
1449 lparen
1450     optional_space .and '(' .and optional_space;
1451
1452 minus
1453     optional_space .and '-' .and optional_space;
1454
1455 minusequals
1456     optional_space .and '-' .and '=' .and optional_space;
1457
1458 minusminus
1459     optional_space .and '-' .and '-' .and optional_space;
1460
1461 /*percent
1462     optional_space .and '%' .and optional_space;*/
1463
1464 /*percentequals
1465     optional_space .and '%' .and '=' .and optional_space;*/
1466
1467 plus
1468     optional_space .and '+' .and optional_space;
1469
1470 plusequals
1471     optional_space .and '+' .and '=' .and optional_space;
1472
1473 plusplus
1474     optional_space .and '+' .and '+' .and optional_space;
1475
1476 question
1477     optional_space .and '?' .and optional_space;
1478
1479 rbrace
1480     optional_space .and '}' .and optional_space;
1481
1482 rbracket
1483     optional_space .and ']' .and optional_space;
1484
1485 rparen
1486     optional_space .and ')' .and optional_space;
1487
1488 semicolon
1489     optional_space .and ';' .and optional_space;
1490
1491 slash
1492     optional_space .and '/' .and optional_space;
1493
1494 slashequals
1495     optional_space .and '/' .and '=' .and optional_space;
1496
1497 star
1498     optional_space .and '*' .and optional_space;
1499
1500 starequals
1501     optional_space .and '*' .and '=' .and optional_space;
1502
1503 /*tilde
1504     optional_space .and '~' .and optional_space;*/
1505
1506 /* string rulez - these are used internally by the parser when parsing quoted strings */
1507
1508 .string string_lexer;
1509
1510 string_lexer
1511     lex_first_identifier_character .and .loop lex_next_identifier_character;
1512
1513 lex_first_identifier_character
1514     'a'-'z' .or 'A'-'Z' .or '_';
1515
1516 lex_next_identifier_character
1517     'a'-'z' .or 'A'-'Z' .or '0'-'9' .or '_';
1518
1519 /* error rulez - these are used by error messages */
1520
1521 err_token
1522     '~' .or '`' .or '!' .or '@' .or '#' .or '$' .or '%' .or '^' .or '&' .or '*' .or '(' .or ')' .or
1523     '-' .or '+' .or '=' .or '|' .or '\\' .or '[' .or ']' .or '{' .or '}' .or ':' .or ';' .or '"' .or
1524     '\'' .or '<' .or ',' .or '>' .or '.' .or '/' .or '?' .or err_identifier;
1525
1526 err_identifier
1527     id_character_first .and .loop id_character_next;
1528