8 lines
233 B
BNF
8 lines
233 B
BNF
EXPRESSION := NUMBER | NUMBER <SPACE> OPERATOR <SPACE> EXPRESSION
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<NUMBER> := #'[IVXLCDM]+'
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<OPERATOR> := ADD | SUBTRACT | MULTIPLY | DIVIDE
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ADD := <'+'>
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SUBTRACT := <'-'>
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MULTIPLY := <'x'> | <'*'>
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DIVIDE := <'/'>
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SPACE := #'(?U)\s+' |