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Add support for EBNF

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Extended Backus–Naur form ([EBNF][]) is a metalanguage used to specify
language grammars.

[EBNF]: https://en.wikipedia.org/wiki/Extended_Backus–Naur_form
This commit is contained in:
René Schwaiger
2016-10-31 14:51:51 +01:00
parent 417239004a
commit 33899b9d6b
9 changed files with 184 additions and 0 deletions
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samples/EBNF/grammar.ebnf Normal file
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(*
Source: https://github.com/sunjay/lion
License: MIT
*)
Statement = ( NamedFunction | AnonymousFunction | Assignment | Expr ) , "\n" ;
Expr = AnonymousFunction | Term | "(" , Expr , ")" ,
{ AnonymousFunction | Term | "(" , Expr , ")" } ;
Assignment = Symbol , "=" , Expr ;
AnonymousFunction = "\" , FunctionRHS ;
NamedFunction = Symbol , FunctionRHS ;
FunctionRHS = FunctionParams , "=" , FunctionBody ;
FunctionParams = FunctionParam , { FunctionParam } ;
FunctionParam = Term ;
FunctionBody = Expr ;
Term = Symbol | Number | SingleWordString ;
SingleWordString = '"' , Symbol , '"' ;
(* Symbol is a collection of valid symbol characters, not defined here *)
(* Number is a valid numeric literal *)