19 lines
542 B
Plaintext
19 lines
542 B
Plaintext
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(* Grammatical EBNF *)
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Ruleset = (COMMENT? Rule)* EOI ;
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Rule = ident '=' Either? ';' ;
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Either = Follow ('|' Follow)* ;
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Follow = (Any | Many | Maybe | Not)+ ;
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Any = Not '*' ;
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Many = Not '+' ;
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Maybe = Not '?' ;
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Not = '!'? Prime ;
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Prime = Group | chr | str | ident ;
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Group = '(' Either ')' ;
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ident = XID_START XID_CONTINUE* ;
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str = '"' (!'"' ANY)* '"' ;
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chr = "'" (!"'" ANY)* "'" ;
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WHITESPACE = WHITE_SPACE ;
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COMMENT = "(*" (COMMENT | !"*)" ANY)* "*)" ;
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