50 lines
587 B
Plaintext
50 lines
587 B
Plaintext
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grammar bf;
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program
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: statements EOF;
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statements
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: eligibleStmt*;
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eligibleStmt
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: stmt
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| numberedStmt
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;
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numberedStmt
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: stmt NUMBER
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;
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stmt
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: basicStmt
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| loopStmt
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;
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loopStmt
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: LOOPSTART statements LOOPEND
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;
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basicStmt
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: INC # ptrIncr
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| DEC # ptrDecr
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| LEFT # ptrLeft
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| RIGHT # ptrRight
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| INPUT # inputStmt
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| OUTPUT # outputStmt
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;
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LOOPSTART: '[';
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LOOPEND:']';
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NUMBER: [0-9]+;
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INPUT: ',';
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OUTPUT: '.';
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DEC: '-';
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INC: '+';
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LEFT: '<';
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RIGHT: '>';
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EVERYTHING_ELSE: . ->channel(HIDDEN);
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WS: [ \r\n] -> skip;
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