bnf

I'm looking for Ruby grammar in BNF form. Is there an official version? Adrian Grigore Yes, there is one Ruby BNF syntax by the University of buffalo. Edit: I've also found this alternate Ruby BNF syntax . The YACC syntax is in the Ruby source. Download it and run the bundled utiliy to get the readable syntax. wget ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p195.tar.gz tar xvzf ruby-2.0.0-p195.tar.gz cd ruby-2.0.0-p195 ruby sample/exyacc.rb < parse.y Output sample (total 918 lines for the v2.0.0-p195) program : top_compstmt ; top_compstmt : top_stmts opt_terms ; top_stmts : none | top

How can I convert this BNF to EBNF? <vardec> ::= var <vardeclist>; <vardeclist> ::= <varandtype> {;<varandtype>} <varandtype> ::= <ident> {,<ident>} : <typespec> <ident> ::= <letter> {<idchar>} <idchar> ::= <letter> | <digit> | _ EBNF or Extended Backus-Naur Form is ISO 14977:1996 , and is available in PDF from ISO for free * . It is not widely used by the computer language standards. There's also a paper that describes it, and that paper contains this table summarizing EBNF notation. Table 1: Extended BNF Extended BNF Operator Meaning ----------------------------------------------------------

I'm trying to learn BNF and attempting to assemble some Z80 ASM code. Since I'm new to both fields, my question is, am I even on the right track? I am trying to write the format of Z80 ASM as EBNF so that I can then figure out where to go from there to create machine code from the source. At the moment I have the following: Assignment = Identifier, ":" ; Instruction = Opcode, [ Operand ], [ Operand ] ; Operand = Identifier | Something* ; Something* = "(" , Identifier, ")" ; Identifier = Alpha, { Numeric | Alpha } ; Opcode = Alpha, Alpha ; Int = [ "-" ], Numeric, { Numeric } ; Alpha = "A" | "B"