Macro brackets

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

Parse inside of [ ] square brackets.

This macro parses a set of balanced brackets and invokes a sub-parser on the content inside. The sub-parser is required to consume all tokens within the brackets in order for this parser to return successfully.

• Syntax: brackets!(CONTENT)
• Output: (token::Bracket, CONTENT)

#[macro_use]
extern crate syn;

use syn::Expr;
use syn::token::Bracket;

/// Parses an expression inside of brackets.
///
/// Example: `[1 + 1]`
named!(expr_paren -> (Bracket, Expr), brackets!(syn!(Expr)));

This macro is available if Syn is built with the "parsing" feature.