join_impl 0.3.0

Implementation of the `join!` macro.
Documentation 
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//!
//! All expression definitions and `InnerExpr` trait.
//!

use syn::Expr;

mod err_expr;
mod initial_expr;
mod process_expr;

mod action_expr;
mod macros;

pub use action_expr::ActionExpr;
pub use err_expr::ErrExpr;
pub use initial_expr::InitialExpr;
pub use process_expr::ProcessExpr;

///
/// Provide functionality to get or replace inner `Expr`(s).
///
pub trait InnerExpr
where
    Self: Sized,
{
    ///
    /// Extracts `Expr`(s) from given value if applicable.
    ///
    fn inner_exprs(&self) -> Option<&[Expr]>;

    ///
    /// Replaces current expr by given `Expr` if it's possible, returning Some(`Self`) with given `Expr`(s),
    /// otherwise returns `None`.
    ///
    fn replace_inner_exprs(self, expr: &[Expr]) -> Option<Self>;

    ///
    /// Checks if expr can be replaced.
    ///
    fn is_replaceable(&self) -> bool {
        true
    }
}