ebnf 0.1.1

A successor bnf parsing library of bnf parsing library, for parsing Extended Backus–Naur form context-free grammars
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

# ebnf


The code is available on [GitHub](https://github.com/ChAoSUnItY/ebnf)

## Disclaimer:

There are various variants of EBNF, which uses somewhat different syntactic conventions. This library 
takes [EBNF Evaluator](https://mdkrajnak.github.io/ebnftest/)'s example code as standard, which has 
almost most syntactic conventions on Wikipedia's page.

## What does a valid EBNF grammar looks like?


The following example is taken from EBNF Evaluator:

```ebnf
filter ::= ( first ' ' )? ( number '~ ' )? ( number '-' number ) ( ' ' number '~' )? ( ' hz' )? ( ' b' )? ( ' i' )? ( ' a' )?
first  ::= #'[a-za-z][a-za-z0-9_+]*'
number ::= digits ( ( '.' | ',' ) digits? )?
digits ::= #'[0-9]+'
```

## How to use this library?


```rust
extern crate ebnf;

fn main() {
    let source = r"
        filter ::= ( first ' ' )? ( number '~ ' )? ( number '-' number ) ( ' ' number '~' )? ( ' hz' )? ( ' b' )? ( ' i' )? ( ' a' )?
        first  ::= #'[a-za-z][a-za-z0-9_+]*'
        number ::= digits ( ( '.' | ',' ) digits? )?
        digits ::= #'[0-9]+'
    ";

    let result = ebnf::get_grammar(source);
}
```