Actually, it seems like the curly braces are wrong, change them to
parentheses. And... use regular expressions:
lowercase ::= [a-z]
uppercase ::= [A-Z]
digit ::= [0-9]
If you need curly braces for some reason, you'll have to put them inside
quotes: "{" "}", but the grammar interpreter needs parentheses.
On 1/6/2013 10:27 PM, Piaget Modeler wrote:
I'm having a tiny problem crafting an EBNF.
I'm getting the following error from the railroad diagram generator (
http://railroad.my28msec.com/rr/ui ) :
*lexical analysis failed while expecting [NCName, Context,
StringLiteral, CharCode, '/*ws:explicit*/', '/*ws:definition*/', S,
Comment, EOF, '$', '&', '(', ')', '*', '+', '-', '.', '/', '<<', '<?',
'<?ENCORE?>', '<?TOKENS?>', '>>', '?', '[', '|'] *
*
*
*at line 26, column 17: ...*
*
*
*{ letter | digit | " " }* ']' symbol ::= letter { letter | di...*
for the current iteration of the PREMISE EBNF
*term ::= number | moment | string | symbol | scheme | collection*
*
*
*number ::= float_positive | float_negative*
*
*
*float_positive ::= '#' [0-9]+ '.' [0-9]* *
*
*
*float_negative ::= '#-' [0-9]+ '.' [0-9]* *
*
*
*moment ::= '@' [0-9]+ *
*
*
*letter ::= uppercase | lowercase *
*
*
*uppercase ::= "A" | "B" | "C" | "D" | "E" | "F" | "G"*
* | "H" | "I" | "J" | "K" | "L" | "M" | "N"*
* | "O" | "P" | "Q" | "R" | "S" | "T" | "U"*
* | "V" | "W" | "X" | "Y" | "Z"*
*
*
*lowercase ::= "a" | "b" | "c" | "d" | "e" | "f" | "g"*
* | "h" | "i" | "j" | "k" | "l" | "m" | "n"*
* | "o" | "p" | "q" | "r" | "s" | "t" | "u"*
* | "v" | "w" | "x" | "y" | "z"*
*
*
*digit ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"*
*
*
*
*
*string ::= '$[' { letter | digit | " " }* ']'*
*
*
*symbol ::= letter { letter | digit }**
*
*
*scheme ::= positional | slotted *
*
*
*positional ::= symbol '(' term { ',' term }* ')' *
*
*
*slotted ::= symbol '(' slot ':' term { ',' slot ':' term }* ')' *
*
*
*slot ::= symbol*
*
*
*collection ::= sequence | concurrence | choice | cycle*
*
*
*sequence ::= '[' term* ']' *
*
*
*concurrence ::= '(' term* ')' *
*
*
*choice ::= '{' term* '}' *
*
*
*cycle ::= '<' term* '>' *
Your thoughts?
~PM
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