34 lines
718 B
Plaintext
34 lines
718 B
Plaintext
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grammar Arit;
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prog: statement+ EOF #statementList
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;
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statement
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: expr SCOL #exprInstr
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| 'set' ID '=' expr SCOL #assignInstr
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;
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expr: expr multop=(MULT | DIV) expr #multiplicationExpr
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| expr addop=(PLUS | MINUS) expr #additiveExpr
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| atom #atomExpr
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;
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atom: INT #numberAtom
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| ID #idAtom
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| '(' expr ')' #parens
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;
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SCOL : ';';
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PLUS : '+';
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MINUS : '-';
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MULT : '*';
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DIV : '/';
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ID: [a-zA-Z_] [a-zA-Z_0-9]*;
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INT: [0-9]+;
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COMMENT: '#' ~[\r\n]* -> skip;
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NEWLINE: '\r'? '\n' -> skip;
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WS : (' '|'\t')+ -> skip;
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