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;
17 use config::{Config, IndentStyle};
20 /// Rewrite self into shape.
21 fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String>;
25 pub struct RewriteContext<'a> {
26 pub parse_session: &'a ParseSess,
27 pub codemap: &'a CodeMap,
28 pub config: &'a Config,
29 pub inside_macro: bool,
30 // Force block indent style even if we are using visual indent style.
32 // When `format_if_else_cond_comment` is true, unindent the comment on top
33 // of the `else` or `else if`.
34 pub is_if_else_block: bool,
35 // When rewriting chain, veto going multi line except the last element
36 pub force_one_line_chain: bool,
39 impl<'a> RewriteContext<'a> {
40 pub fn snippet(&self, span: Span) -> String {
41 self.codemap.span_to_snippet(span).unwrap()
44 /// Return true if we should use block indent style for rewriting function call.
45 pub fn use_block_indent(&self) -> bool {
46 self.config.fn_call_style() == IndentStyle::Block || self.use_block
49 pub fn budget(&self, used_width: usize) -> usize {
50 self.config.max_width().checked_sub(used_width).unwrap_or(0)