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grammarExample.txt
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grammarExample.txt
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additive_operator:
| `'+'`
| `'-'`
argument_expression_list:
| `'('` ( expression ( `','` expression )* `','` ? )? `')'`
assignment_statement:
| compound_assignment_operator
| `'='`
attribute:
| `'@'` `'align'` `'('` expression `','` ? `')'`
| `'@'` `'binding'` `'('` expression `','` ? `')'`
| `'@'` `'builtin'` `'('` expression `','` ? `')'`
| `'@'` `'compute'`
| `'@'` `'const'`
| `'@'` `'diagnostic'` diagnostic_control
| `'@'` `'fragment'`
| `'@'` `'group'` `'('` expression `','` ? `')'`
| `'@'` `'id'` `'('` expression `','` ? `')'`
| `'@'` `'interpolate'` `'('` expression `','` ? `')'`
| `'@'` `'interpolate'` `'('` expression `','` expression `','` ? `')'`
| `'@'` `'invariant'`
| `'@'` `'location'` `'('` expression `','` ? `')'`
| `'@'` `'must_use'`
| `'@'` `'size'` `'('` expression `','` ? `')'`
| `'@'` `'vertex'`
| `'@'` `'workgroup_size'` `'('` expression `','` ? `')'`
| `'@'` `'workgroup_size'` `'('` expression `','` expression `','` ? `')'`
| `'@'` `'workgroup_size'` `'('` expression `','` expression `','` expression `','` ? `')'`
bitwise_expression.post.unary_expression:
| `'&'` unary_expression ( `'&'` unary_expression )*
| `'^'` unary_expression ( `'^'` unary_expression )*
| `'|'` unary_expression ( `'|'` unary_expression )*
bool_literal:
| `'false'`
| `'true'`
case_selector:
| expression
| `'default'`
component_or_swizzle_specifier:
| `'.'` member_ident component_or_swizzle_specifier ?
| `'.'` swizzle_name component_or_swizzle_specifier ?
| `'['` expression `']'` component_or_swizzle_specifier ?
compound_assignment_operator:
| shift_left_assign
| shift_right_assign
| `'%='`
| `'&='`
| `'*='`
| `'+='`
| `'-='`
| `'/='`
| `'^='`
| `'|='`
compound_statement:
| attribute * `'{'` statement * `'}'`
core_lhs_expression:
| ident
| `'('` lhs_expression `')'`
decimal_float_literal:
| `/0[fh]/`
| `/[0-9]*\.[0-9]+([eE][+-]?[0-9]+)?[fh]?/`
| `/[0-9]+[eE][+-]?[0-9]+[fh]?/`
| `/[0-9]+\.[0-9]*([eE][+-]?[0-9]+)?[fh]?/`
| `/[1-9][0-9]*[fh]/`
decimal_int_literal:
| `/0[iu]?/`
| `/[1-9][0-9]*[iu]?/`
diagnostic_control:
| `'('` severity_control_name `','` diagnostic_rule_name `','` ? `')'`
diagnostic_rule_name:
| ident_pattern_token
| ident_pattern_token `'.'` ident_pattern_token
expression:
| unary_expression bitwise_expression.post.unary_expression
| unary_expression relational_expression.post.unary_expression
| unary_expression relational_expression.post.unary_expression `'&&'` unary_expression relational_expression.post.unary_expression ( `'&&'` unary_expression relational_expression.post.unary_expression )*
| unary_expression relational_expression.post.unary_expression `'||'` unary_expression relational_expression.post.unary_expression ( `'||'` unary_expression relational_expression.post.unary_expression )*
float_literal:
| decimal_float_literal
| hex_float_literal
for_init:
| ident template_elaborated_ident.post.ident argument_expression_list
| variable_or_value_statement
| variable_updating_statement
for_update:
| ident template_elaborated_ident.post.ident argument_expression_list
| variable_updating_statement
global_decl:
| attribute * `'fn'` ident `'('` ( attribute * ident `':'` type_specifier ( `','` param )* `','` ? )? `')'` ( `'->'` attribute * ident template_elaborated_ident.post.ident )? attribute * `'{'` statement * `'}'`
| attribute * `'var'` ( _template_args_start expression ( `','` expression )* `','` ? _template_args_end )? optionally_typed_ident ( `'='` expression )? `';'`
| global_value_decl `';'`
| `';'`
| `'alias'` ident `'='` ident template_elaborated_ident.post.ident `';'`
| `'const_assert'` expression `';'`
| `'struct'` ident `'{'` attribute * member_ident `':'` type_specifier ( `','` attribute * member_ident `':'` type_specifier )* `','` ? `'}'`
global_directive:
| `'diagnostic'` `'('` severity_control_name `','` diagnostic_rule_name `','` ? `')'` `';'`
| `'enable'` ident_pattern_token ( `','` ident_pattern_token )* `','` ? `';'`
| `'requires'` ident_pattern_token ( `','` ident_pattern_token )* `','` ? `';'`
global_value_decl:
| attribute * `'override'` optionally_typed_ident ( `'='` expression )?
| `'const'` optionally_typed_ident `'='` expression
hex_float_literal:
| `/0[xX][0-9a-fA-F]*\.[0-9a-fA-F]+([pP][+-]?[0-9]+[fh]?)?/`
| `/0[xX][0-9a-fA-F]+[pP][+-]?[0-9]+[fh]?/`
| `/0[xX][0-9a-fA-F]+\.[0-9a-fA-F]*([pP][+-]?[0-9]+[fh]?)?/`
ident:
| ident_pattern_token
int_literal:
| decimal_int_literal
| hex_int_literal
lhs_expression:
| core_lhs_expression component_or_swizzle_specifier ?
| `'&'` lhs_expression
| `'*'` lhs_expression
literal:
| bool_literal
| float_literal
| int_literal
member_ident: ident_pattern_token
multiplicative_operator:
| `'%'`
| `'*'`
| `'/'`
optionally_typed_ident:
| ident ( `':'` type_specifier )?
param:
| attribute * ident `':'` type_specifier
primary_expression:
| ident template_elaborated_ident.post.ident
| ident template_elaborated_ident.post.ident `'('` ( expression ( `','` expression )* `','` ? )? `')'`
| literal
| `'('` expression `')'`
relational_expression.post.unary_expression:
| shift_expression.post.unary_expression
| shift_expression.post.unary_expression greater_than unary_expression shift_expression.post.unary_expression
| shift_expression.post.unary_expression greater_than_equal unary_expression shift_expression.post.unary_expression
| shift_expression.post.unary_expression less_than unary_expression shift_expression.post.unary_expression
| shift_expression.post.unary_expression less_than_equal unary_expression shift_expression.post.unary_expression
| shift_expression.post.unary_expression `'!='` unary_expression shift_expression.post.unary_expression
| shift_expression.post.unary_expression `'=='` unary_expression shift_expression.post.unary_expression
severity_control_name:
| `'error'`
| `'info'`
| `'off'`
| `'warning'`
shift_expression.post.unary_expression:
| ( multiplicative_operator unary_expression )* ( additive_operator unary_expression ( multiplicative_operator unary_expression )* )*
| shift_left unary_expression
| shift_right unary_expression
statement:
| attribute * `'for'` `'('` for_init ? `';'` expression ? `';'` for_update ? `')'` compound_statement
| attribute * `'if'` expression compound_statement ( `'else'` `'if'` expression compound_statement )* ( `'else'` compound_statement )?
| attribute * `'loop'` attribute * `'{'` statement * ( `'continuing'` attribute * `'{'` statement * ( `'break'` `'if'` expression `';'` )? `'}'` )? `'}'`
| attribute * `'switch'` expression attribute * `'{'` switch_clause * `'}'`
| attribute * `'while'` expression compound_statement
| compound_statement
| ident template_elaborated_ident.post.ident `'('` ( expression ( `','` expression )* `','` ? )? `')'` `';'`
| variable_or_value_statement `';'`
| variable_updating_statement `';'`
| break_statement `';'`
| continue_statement `';'`
| `';'`
| `'const_assert'` expression `';'`
| `'discard'` `';'`
| `'return'` expression ? `';'`
switch_clause:
| `'case'` case_selector ( `','` case_selector )* `','` ? `':'` ? compound_statement
| `'default'` `':'` ? compound_statement
swizzle_name:
| `/[rgba]/`
| `/[rgba][rgba]/`
| `/[rgba][rgba][rgba]/`
| `/[rgba][rgba][rgba][rgba]/`
| `/[xyzw]/`
| `/[xyzw][xyzw]/`
| `/[xyzw][xyzw][xyzw]/`
| `/[xyzw][xyzw][xyzw][xyzw]/`
template_arg_expression: expression
template_elaborated_ident.post.ident:
| ( _template_args_start template_arg_expression ( `','` expression )* `','` ? _template_args_end )?
translation_unit:
| global_directive * global_decl *
type_specifier:
| ident ( _template_args_start template_arg_expression ( `','` expression )* `','` ? _template_args_end )?
unary_expression:
| primary_expression component_or_swizzle_specifier ?
| `'!'` unary_expression
| `'&'` unary_expression
| `'*'` unary_expression
| `'-'` unary_expression
| `'~'` unary_expression
variable_decl:
| `'var'` ( _template_args_start expression ( `','` expression )* `','` ? _template_args_end )? optionally_typed_ident
variable_or_value_statement:
| variable_decl
| variable_decl `'='` expression
| `'const'` optionally_typed_ident `'='` expression
| `'let'` optionally_typed_ident `'='` expression
variable_updating_statement:
| lhs_expression ( `'='` | compound_assignment_operator ) expression
| lhs_expression `'++'`
| lhs_expression `'--'`
| `'_'` `'='` expression