ranges in ebnf of eto

[Chris Anders]

can i use ranges in ebnf?
like: "a" - "z"

[Curtis Wensley]

Yes, if you use the w3c style where [ ] means a character range instead of an optional section.  w3c uses cardinality flags after a terminal or section to denote zero or more (*), one or more (+), or optional (?).

e.g. you can do something like this to match a-z, A-Z, 0-9, and these characters: !@#%

MyTerm ::= [a-zA-Z0-9!@#%];

You can also inverse that by prefixing the sequence with ^, for example:

MyTerm ::= [^a-z]

You can define the specific options of the Ebnf parser to turn on EbnfStyle.CharacterSets, but is mutually exclusive with EbnfStyle.SquareBracketAsOptional.  EbnfStyle.SquareBracketAsOptional takes precedence if you define both flags.

Hope this helps!

Curtis.

[Chris Anders]

it doesnt work: error parsing ebnf

with your production

[Chris Anders]

it workd now but it doesnt match:

h ::= [a-z]

but your production gives formatexception: error parsing ebnf