60 lines
826 B
Plaintext
60 lines
826 B
Plaintext
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grammar ArithmeticsEvaluator;
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fragment DIGIT: '0'..'9';
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fragment LETTER: 'a'..'z';
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fragment UNDERSCORE: '_';
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ID: (LETTER | UNDERSCORE) (LETTER | UNDERSCORE | DIGIT)*;
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NUM: (DIGIT | '.')+ ([eE] MINUS? DIGIT+)?;
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MUL: '*';
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DIV: '/';
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PLUS: '+';
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MINUS: '-';
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POW: '^';
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COMMA: ',';
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LPAR: '(';
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RPAR: ')';
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WS: [ \n\t\r]+ -> skip;
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number
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: NUM
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;
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singular
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: ID
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;
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unaryFunction
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: ID LPAR subSumChain RPAR
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;
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binaryFunction
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: ID LPAR subSumChain COMMA subSumChain RPAR
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;
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term
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: number
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| singular
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| unaryFunction
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| binaryFunction
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| MINUS term
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| LPAR subSumChain RPAR
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;
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powChain
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: term (POW term)*
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;
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divMulChain
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: powChain ((PLUS | MINUS) powChain)*
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;
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subSumChain
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: divMulChain ((DIV | MUL) divMulChain)*
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;
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rootParser
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: subSumChain EOF
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;
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