grammar/expression.grm


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main -> expression
expression -> binary_operation | number | '(' expression ')'
binary_operation -> expression binary_operand expression
binary_operand -> '+' | '-' | '*' | '/'
number -> digit number | digit
digit -> '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'