1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // A generic trait to abstract the rewriting of an element (of the AST).
13 use syntax::codemap::{CodeMap, Span};
14 use syntax::parse::ParseSess;
20 /// Rewrite self into offset and width.
21 /// `offset` is the indentation of the first line. The next lines
22 /// should begin with a least `offset` spaces (except backwards
23 /// indentation). The first line should not begin with indentation.
24 /// `width` is the maximum number of characters on the last line
25 /// (excluding offset). The width of other lines is not limited by
27 fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String>;
30 pub struct RewriteContext<'a> {
31 pub parse_session: &'a ParseSess,
32 pub codemap: &'a CodeMap,
33 pub config: &'a Config,
34 // Indentation due to nesting of blocks.
35 pub block_indent: Indent,
38 impl<'a> RewriteContext<'a> {
39 pub fn nested_context(&self) -> RewriteContext<'a> {
41 parse_session: self.parse_session,
42 codemap: self.codemap,
44 block_indent: self.block_indent.block_indent(self.config),
48 pub fn snippet(&self, span: Span) -> String {
49 self.codemap.span_to_snippet(span).unwrap()