Enum Sexpr 

pub enum Sexpr {
    Atom(String),
    List(Vec<Sexpr>),
}

Variants

Atom(String)

List(Vec<Sexpr>)

Implementations

impl Sexpr

pub fn print(&self) -> String

Examples found in repository

examples/ebnftree.rs (line 38)

fn main() {
    let grammar = r#"
        expr   := expr ('+'|'-') term | term ;
        term   := term ('*'|'/') factor | factor ;
        factor := '-' factor | power ;
        power  := ufact '^' factor | ufact ;
        ufact  := ufact '!' | group ;
        group  := num | '(' expr ')' ;
    "#;

    let input = std::env::args().skip(1).
        collect::<Vec<String>>().join(" ");

    use std::str::FromStr;
    let trificator = abackus::ParserBuilder::default()
        .plug_terminal("num", |n| f64::from_str(n).is_ok())
        .sexprificator(&grammar, "expr");

    match trificator(&mut tokenizer(input.chars())) {
        Ok(trees) => for t in trees { println!("{}", t.print()); },
        Err(e) => println!("{:?}", e)
    }
}

Trait Implementations

impl Clone for Sexpr

fn clone(&self) -> Sexpr

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Sexpr

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.