Macro unrest_tmp_synom::map [−] [src]

macro_rules! map {
    ($i:expr, $submac:ident!( $($args:tt)* ), $g:expr) => { ... };
    ($i:expr, $f:expr, $g:expr) => { ... };
}

Transform the result of a parser by applying a function or closure.

Syntax: map!(THING, FN)
Output: the return type of function FN applied to THING

extern crate syn;
#[macro_use] extern crate synom;

use syn::{Expr, ExprIf};

fn get_cond(if_: ExprIf) -> Expr {
    *if_.cond
}

// Parses an `if` statement but returns the condition part only.
named!(if_condition -> Expr,
    map!(syn!(ExprIf), get_cond)
);

// Or equivalently:
named!(if_condition2 -> Expr,
    map!(syn!(ExprIf), |if_| *if_.cond)
);