1 //! This module contains types and functions to support formatting specific line ranges.
3 use std::collections::HashMap;
4 use std::path::PathBuf;
6 use std::{cmp, fmt, iter, str};
8 use serde::{ser, Deserialize, Deserializer, Serialize, Serializer};
9 use serde_json as json;
11 use syntax::source_map::{self, SourceFile};
13 /// A range of lines in a file, inclusive of both ends.
14 pub struct LineRange {
15 pub file: Rc<SourceFile>,
20 /// Defines the name of an input - either a file or stdin.
21 #[derive(Clone, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
27 impl From<source_map::FileName> for FileName {
28 fn from(name: source_map::FileName) -> FileName {
30 source_map::FileName::Real(p) => FileName::Real(p),
31 source_map::FileName::Custom(ref f) if f == "stdin" => FileName::Stdin,
37 impl fmt::Display for FileName {
38 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
40 FileName::Real(p) => write!(f, "{}", p.to_str().unwrap()),
41 FileName::Stdin => write!(f, "stdin"),
46 impl<'de> Deserialize<'de> for FileName {
47 fn deserialize<D>(deserializer: D) -> Result<FileName, D::Error>
51 let s = String::deserialize(deserializer)?;
55 Ok(FileName::Real(s.into()))
60 impl Serialize for FileName {
61 fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
66 FileName::Stdin => Ok("stdin"),
67 FileName::Real(path) => path
69 .ok_or_else(|| ser::Error::custom("path can't be serialized as UTF-8 string")),
72 s.and_then(|s| serializer.serialize_str(s))
77 pub fn file_name(&self) -> FileName {
78 self.file.name.clone().into()
82 /// A range that is inclusive of both ends.
83 #[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord, Deserialize)]
89 impl<'a> From<&'a LineRange> for Range {
90 fn from(range: &'a LineRange) -> Range {
91 Range::new(range.lo, range.hi)
96 pub fn new(lo: usize, hi: usize) -> Range {
100 fn is_empty(self) -> bool {
105 fn contains(self, other: Range) -> bool {
106 if other.is_empty() {
109 !self.is_empty() && self.lo <= other.lo && self.hi >= other.hi
113 fn intersects(self, other: Range) -> bool {
114 if self.is_empty() || other.is_empty() {
117 (self.lo <= other.hi && other.hi <= self.hi)
118 || (other.lo <= self.hi && self.hi <= other.hi)
122 fn adjacent_to(self, other: Range) -> bool {
123 if self.is_empty() || other.is_empty() {
126 self.hi + 1 == other.lo || other.hi + 1 == self.lo
130 /// Returns a new `Range` with lines from `self` and `other` if they were adjacent or
131 /// intersect; returns `None` otherwise.
132 fn merge(self, other: Range) -> Option<Range> {
133 if self.adjacent_to(other) || self.intersects(other) {
135 cmp::min(self.lo, other.lo),
136 cmp::max(self.hi, other.hi),
144 /// A set of lines in files.
146 /// It is represented as a multimap keyed on file names, with values a collection of
147 /// non-overlapping ranges sorted by their start point. An inner `None` is interpreted to mean all
148 /// lines in all files.
149 #[derive(Clone, Debug, Default, PartialEq)]
150 pub struct FileLines(Option<HashMap<FileName, Vec<Range>>>);
152 /// Normalizes the ranges so that the invariants for `FileLines` hold: ranges are non-overlapping,
153 /// and ordered by their start point.
154 fn normalize_ranges(ranges: &mut HashMap<FileName, Vec<Range>>) {
155 for ranges in ranges.values_mut() {
157 let mut result = vec![];
158 let mut iter = ranges.iter_mut().peekable();
159 while let Some(next) = iter.next() {
160 let mut next = *next;
161 while let Some(&&mut peek) = iter.peek() {
162 if let Some(merged) = next.merge(peek) {
163 iter.next().unwrap();
176 /// Creates a `FileLines` that contains all lines in all files.
177 pub(crate) fn all() -> FileLines {
181 /// Returns `true` if this `FileLines` contains all lines in all files.
182 pub(crate) fn is_all(&self) -> bool {
186 pub fn from_ranges(mut ranges: HashMap<FileName, Vec<Range>>) -> FileLines {
187 normalize_ranges(&mut ranges);
188 FileLines(Some(ranges))
191 /// Returns an iterator over the files contained in `self`.
192 pub fn files(&self) -> Files<'_> {
193 Files(self.0.as_ref().map(HashMap::keys))
196 /// Returns JSON representation as accepted by the `--file-lines JSON` arg.
197 pub fn to_json_spans(&self) -> Vec<JsonSpan> {
200 Some(file_ranges) => file_ranges
202 .flat_map(|(file, ranges)| ranges.iter().map(move |r| (file, r)))
203 .map(|(file, range)| JsonSpan {
204 file: file.to_owned(),
205 range: (range.lo, range.hi),
211 /// Returns `true` if `self` includes all lines in all files. Otherwise runs `f` on all ranges
212 /// in the designated file (if any) and returns true if `f` ever does.
213 fn file_range_matches<F>(&self, file_name: &FileName, f: F) -> bool
215 F: FnMut(&Range) -> bool,
217 let map = match self.0 {
218 // `None` means "all lines in all files".
220 Some(ref map) => map,
223 match canonicalize_path_string(file_name).and_then(|file| map.get(&file)) {
224 Some(ranges) => ranges.iter().any(f),
229 /// Returns `true` if `range` is fully contained in `self`.
231 pub(crate) fn contains(&self, range: &LineRange) -> bool {
232 self.file_range_matches(&range.file_name(), |r| r.contains(Range::from(range)))
235 /// Returns `true` if any lines in `range` are in `self`.
236 pub(crate) fn intersects(&self, range: &LineRange) -> bool {
237 self.file_range_matches(&range.file_name(), |r| r.intersects(Range::from(range)))
240 /// Returns `true` if `line` from `file_name` is in `self`.
241 pub(crate) fn contains_line(&self, file_name: &FileName, line: usize) -> bool {
242 self.file_range_matches(file_name, |r| r.lo <= line && r.hi >= line)
245 /// Returns `true` if all the lines between `lo` and `hi` from `file_name` are in `self`.
246 pub(crate) fn contains_range(&self, file_name: &FileName, lo: usize, hi: usize) -> bool {
247 self.file_range_matches(file_name, |r| r.contains(Range::new(lo, hi)))
251 /// `FileLines` files iterator.
252 pub struct Files<'a>(Option<::std::collections::hash_map::Keys<'a, FileName, Vec<Range>>>);
254 impl<'a> iter::Iterator for Files<'a> {
255 type Item = &'a FileName;
257 fn next(&mut self) -> Option<&'a FileName> {
258 self.0.as_mut().and_then(Iterator::next)
262 fn canonicalize_path_string(file: &FileName) -> Option<FileName> {
264 FileName::Real(ref path) => path.canonicalize().ok().map(FileName::Real),
265 _ => Some(file.clone()),
269 // This impl is needed for `Config::override_value` to work for use in tests.
270 impl str::FromStr for FileLines {
273 fn from_str(s: &str) -> Result<FileLines, String> {
274 let v: Vec<JsonSpan> = json::from_str(s).map_err(|e| e.to_string())?;
275 let mut m = HashMap::new();
277 let (s, r) = JsonSpan::into_tuple(js)?;
278 m.entry(s).or_insert_with(|| vec![]).push(r);
280 Ok(FileLines::from_ranges(m))
284 // For JSON decoding.
285 #[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Deserialize, Serialize)]
286 pub struct JsonSpan {
288 range: (usize, usize),
292 fn into_tuple(self) -> Result<(FileName, Range), String> {
293 let (lo, hi) = self.range;
294 let canonical = canonicalize_path_string(&self.file)
295 .ok_or_else(|| format!("Can't canonicalize {}", &self.file))?;
296 Ok((canonical, Range::new(lo, hi)))
300 // This impl is needed for inclusion in the `Config` struct. We don't have a toml representation
301 // for `FileLines`, so it will just panic instead.
302 impl<'de> ::serde::de::Deserialize<'de> for FileLines {
303 fn deserialize<D>(_: D) -> Result<Self, D::Error>
305 D: ::serde::de::Deserializer<'de>,
308 "FileLines cannot be deserialized from a project rustfmt.toml file: please \
309 specify it via the `--file-lines` option instead"
314 // We also want to avoid attempting to serialize a FileLines to toml. The
315 // `Config` struct should ensure this impl is never reached.
316 impl ::serde::ser::Serialize for FileLines {
317 fn serialize<S>(&self, _: S) -> Result<S::Ok, S::Error>
319 S: ::serde::ser::Serializer,
321 unreachable!("FileLines cannot be serialized. This is a rustfmt bug.");
330 fn test_range_intersects() {
331 assert!(Range::new(1, 2).intersects(Range::new(1, 1)));
332 assert!(Range::new(1, 2).intersects(Range::new(2, 2)));
333 assert!(!Range::new(1, 2).intersects(Range::new(0, 0)));
334 assert!(!Range::new(1, 2).intersects(Range::new(3, 10)));
335 assert!(!Range::new(1, 3).intersects(Range::new(5, 5)));
339 fn test_range_adjacent_to() {
340 assert!(!Range::new(1, 2).adjacent_to(Range::new(1, 1)));
341 assert!(!Range::new(1, 2).adjacent_to(Range::new(2, 2)));
342 assert!(Range::new(1, 2).adjacent_to(Range::new(0, 0)));
343 assert!(Range::new(1, 2).adjacent_to(Range::new(3, 10)));
344 assert!(!Range::new(1, 3).adjacent_to(Range::new(5, 5)));
348 fn test_range_contains() {
349 assert!(Range::new(1, 2).contains(Range::new(1, 1)));
350 assert!(Range::new(1, 2).contains(Range::new(2, 2)));
351 assert!(!Range::new(1, 2).contains(Range::new(0, 0)));
352 assert!(!Range::new(1, 2).contains(Range::new(3, 10)));
356 fn test_range_merge() {
357 assert_eq!(None, Range::new(1, 3).merge(Range::new(5, 5)));
358 assert_eq!(None, Range::new(4, 7).merge(Range::new(0, 1)));
360 Some(Range::new(3, 7)),
361 Range::new(3, 5).merge(Range::new(4, 7))
364 Some(Range::new(3, 7)),
365 Range::new(3, 5).merge(Range::new(5, 7))
368 Some(Range::new(3, 7)),
369 Range::new(3, 5).merge(Range::new(6, 7))
372 Some(Range::new(3, 7)),
373 Range::new(3, 7).merge(Range::new(4, 5))
377 use super::json::{self, json};
378 use super::{FileLines, FileName};
379 use std::{collections::HashMap, path::PathBuf};
382 fn file_lines_to_json() {
383 let ranges: HashMap<FileName, Vec<Range>> = [
385 FileName::Real(PathBuf::from("src/main.rs")),
386 vec![Range::new(1, 3), Range::new(5, 7)],
389 FileName::Real(PathBuf::from("src/lib.rs")),
390 vec![Range::new(1, 7)],
397 let file_lines = FileLines::from_ranges(ranges);
398 let mut spans = file_lines.to_json_spans();
400 let json = json::to_value(&spans).unwrap();
404 {"file": "src/lib.rs", "range": [1, 7]},
405 {"file": "src/main.rs", "range": [1, 3]},
406 {"file": "src/main.rs", "range": [5, 7]},