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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