83 lines
855 B
ANTLR
83 lines
855 B
ANTLR
grammar bfe;
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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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| groupedStmt
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| loopStmt
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;
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groupedStmt
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: GRPSTART statements GRPEND
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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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: ptrIncr
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| ptrDecr
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| ptrLeft
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| ptrRight
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| inputStmt
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| outputStmt
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;
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ptrIncr
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: INC
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;
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ptrDecr
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: DEC
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;
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ptrLeft
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: LEFT
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;
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ptrRight
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: RIGHT
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;
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inputStmt
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: INPUT
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;
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outputStmt
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: OUTPUT
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;
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NEWLINE: '\n' -> skip;
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COMMENT: '//' ~[\r\n]* '\r'? '\n'? -> channel(HIDDEN);
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WS: [ \r\n] -> skip;
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DEF: '#';
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LOOPSTART: '[';
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LOOPEND:']';
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GRPSTART:'(';
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GRPEND:')';
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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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