65 lines
2.2 KiB
Rust
65 lines
2.2 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// A generic trait to abstract the rewriting of an element (of the AST).
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use syntax::codemap::{CodeMap, Span};
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use Indent;
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use config::Config;
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pub trait Rewrite {
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/// Rewrite self into offset and width.
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/// `offset` is the indentation of the first line. The next lines
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/// should begin with a least `offset` spaces (except backwards
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/// indentation). The first line should not begin with indentation.
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/// `width` is the maximum number of characters on the last line
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/// (excluding offset). The width of other lines is not limited by
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/// `width`.
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fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String>;
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}
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pub struct RewriteContext<'a> {
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pub codemap: &'a CodeMap,
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pub config: &'a Config,
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// Indentation due to nesting of blocks.
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pub block_indent: Indent,
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// *Extra* indentation due to overflowing to the next line, e.g.,
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// let foo =
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// bar();
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// The extra 4 spaces when formatting `bar()` is overflow_indent.
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pub overflow_indent: Indent,
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}
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impl<'a> RewriteContext<'a> {
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pub fn nested_context(&self) -> RewriteContext<'a> {
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RewriteContext {
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codemap: self.codemap,
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config: self.config,
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block_indent: self.block_indent.block_indent(self.config),
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overflow_indent: self.overflow_indent,
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}
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}
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pub fn overflow_context(&self, overflow: Indent) -> RewriteContext<'a> {
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RewriteContext {
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codemap: self.codemap,
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config: self.config,
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block_indent: self.block_indent,
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overflow_indent: overflow,
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}
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}
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pub fn snippet(&self, span: Span) -> String {
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self.codemap.span_to_snippet(span).unwrap()
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}
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}
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