// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// A generic trait to abstract the rewriting of an element (of the AST).

use syntax::codemap::CodeMap;

use config::Config;

pub trait Rewrite {
    /// Rewrite self into offset and width.
    /// `offset` is the indentation of the first line. The next lines
    /// should begin with a least `offset` spaces (except backwards
    /// indentation). The first line should not begin with indentation.
    /// `width` is the maximum number of characters on the last line
    /// (excluding offset). The width of other lines is not limited by
    /// `width`.
    fn rewrite(&self, context: &RewriteContext, width: usize, offset: usize) -> Option<String>;
}

pub struct RewriteContext<'a> {
    pub codemap: &'a CodeMap,
    pub config: &'a Config,
}