CODEWITHSUNDEEP
javaccebnf
tas
tas

Reputation: 41

Converting BNF to javacc code

I need to convert the following to javacc from EBNF, I have tried various methods however I am getting an error.

EBNF: code ::== [\x20 - \x7E]

How would this be converted ?

Thanks in advance

Upvotes: 0

Views: 826

Answers (1)

Theodore Norvell
Theodore Norvell

Reputation: 16221

JavaCC supports character ranges. E.g. [" "-"~"] It also supports Unicode escapes as in Java, e.g., ["\u0020"-"\u007E"].

These ranges can be used in the specification of the token manager. Note that the three rules outlined in Question 3.3 of the FAQ apply. So if you have

TOKEN: {
    <LETTER : ["a"-"z","A"-"Z"] >
|
    <PRINTABLE : [" "-"~"] >
}

then in the parser you will want

void Printable() {
    <LETTER> | <PRINTABLE>
}

Upvotes: 1

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