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fog.g4
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fog.g4
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grammar fog;
chunk: block EOF;
block: stat* laststat?;
stat:
functioncall
| label
| 'break'
| 'goto' NAME
| 'while' cond '{' block '}'
| 'if' cond '{' block
('} elseif' cond '{' block)*
('} else {' block)?
'}'
| 'for' type NAME '=' exp ',' exp (',' exp)? '{' block '}'
| 'asm {' .*? '}'
| (type | 'void') NAME funcbody
| constant? type NAME '=' exp
| NAME '=' exp;
laststat: 'return' exp? | 'break' | 'continue';
label: 'label' NAME ':';
cond:
'false'
| 'true'
| exp operatorComparison exp
| cond logicAnd cond
| cond logicOr cond;
namelist: type NAME (',' type NAME)*;
explist: (exp ',')* exp;
exp:
number
| var
| functioncall
| exp operatorIncDec
| operatorIncDec exp
| operatorUnary exp
| exp operatorMul exp
| exp operatorAddSub exp
| exp operatorBitwise exp;
functioncall: var args+;
var: (NAME | '(' exp ')' varSuffix) varSuffix*;
varSuffix: '[' exp ']';
args: '(' explist? ')';
funcbody: '(' namelist? ')' '{' block '}';
logicOr: 'or';
logicAnd: 'and';
operatorComparison: '<' | '>' | '<=' | '>=' | '!=' | '==';
operatorAddSub: '+' | '-';
operatorMul: '*';
operatorBitwise: '&' | '|' | '^' | '<<' | '>>';
operatorUnary: '!' | '-' | '~';
operatorIncDec: '++' | '--';
number: INT | HEX | BINARY;
type: 'i8' | 'i16' | 'i32' | 'byte' | 'short' | 'long';
constant: 'con';
// LEXER
NAME: [a-zA-Z_][a-zA-Z_0-9]*;
INT: Digit+;
HEX: '$' HexDigit+;
BINARY: '%' BinDigit+;
fragment Digit: [0-9];
fragment HexDigit: [0-9a-fA-F];
fragment BinDigit: '0' | '1';
fragment SingleLineInputCharacter: ~[\r\n\u0085\u2028\u2029];
COMMENT: '/*' .*? '*/' -> channel(HIDDEN);
LINE_COMMENT: '//' SingleLineInputCharacter* -> channel(HIDDEN);
WS: [ \t\u000C\r\n]+ -> skip;