A tool for generating railroad diagrams. The EBNF grammar used by the tool is described in doc/introduction/grammar.txt, and you can find some samples under directory sample/.
The EBNF grammar of EBNF:
syntax ::= ( rule )+
rule ::= 'id' ( '::=' | '->' ) expression
expression ::= term ( '|' term )* ( '|' | )
term ::= ( factor )+
factor ::= ( 'id' | 'text' | '(' expression ')' ) ( '+' | '*' | )
id is any string of alpha([a-zA-Z]) characters or number([0-9]) characters or underscores ('_')
text is any double-quoted string("...") or signle-quoted string('...') without newline('\n')
The railroad diagrams of EBNF:
