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 use utils::make_indent;
12 use visitor::FmtVisitor;
14 use syntax::codemap::{self, BytePos};
16 impl<'a> FmtVisitor<'a> {
17 // TODO these format_missing methods are ugly. Refactor and add unit tests
18 // for the central whitespace stripping loop.
19 pub fn format_missing(&mut self, end: BytePos) {
20 self.format_missing_inner(end, |this, last_snippet, file_name, _| {
21 this.changes.push_str(file_name, last_snippet)
25 pub fn format_missing_with_indent(&mut self, end: BytePos) {
26 self.format_missing_inner(end, |this, last_snippet, file_name, snippet| {
27 this.changes.push_str(file_name, last_snippet.trim_right());
28 if last_snippet == snippet {
29 // No new lines in the snippet.
30 this.changes.push_str(file_name, "\n");
32 let indent = make_indent(this.block_indent);
33 this.changes.push_str(file_name, &indent);
37 fn format_missing_inner<F: Fn(&mut FmtVisitor, &str, &str, &str)>(&mut self,
39 process_last_snippet: F) {
40 let start = self.last_pos;
41 debug!("format_missing_inner: {:?} to {:?}",
42 self.codemap.lookup_char_pos(start),
43 self.codemap.lookup_char_pos(end));
46 let file_name = &self.codemap.lookup_char_pos(start).file.name;
47 process_last_snippet(self, "", file_name, "");
52 "Request to format inverted span: {:?} to {:?}",
53 self.codemap.lookup_char_pos(start),
54 self.codemap.lookup_char_pos(end));
57 let spans = self.changes.filespans_for_span(start, end);
58 for (i, &(start, end)) in spans.iter().enumerate() {
59 let span = codemap::mk_sp(BytePos(start), BytePos(end));
60 let file_name = &self.codemap.span_to_filename(span);
61 let snippet = self.snippet(span);
63 self.write_snippet(&snippet,
66 &process_last_snippet);
70 fn write_snippet<F: Fn(&mut FmtVisitor, &str, &str, &str)>(&mut self,
74 process_last_snippet: F) {
75 // Trim whitespace from the right hand side of each line.
76 // Annoyingly, the library functions for splitting by lines etc. are not
77 // quite right, so we must do it ourselves.
78 let mut line_start = 0;
79 let mut last_wspace = None;
80 for (i, c) in snippet.char_indices() {
82 if let Some(lw) = last_wspace {
83 self.changes.push_str(file_name, &snippet[line_start..lw]);
84 self.changes.push_str(file_name, "\n");
86 self.changes.push_str(file_name, &snippet[line_start..i+1]);
92 if c.is_whitespace() {
93 if last_wspace.is_none() {
94 last_wspace = Some(i);
102 process_last_snippet(self, &snippet[line_start..], file_name, snippet);
104 self.changes.push_str(file_name, &snippet[line_start..]);