1 //! This module contains types and functions to support formatting specific line ranges.
3 use itertools::Itertools;
4 use std::collections::HashMap;
5 use std::path::PathBuf;
7 use std::{cmp, fmt, iter, str};
9 use rustc_span::{self, SourceFile};
10 use serde::{ser, Deserialize, Deserializer, Serialize, Serializer};
11 use serde_json as json;
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<rustc_span::FileName> for FileName {
28 fn from(name: rustc_span::FileName) -> FileName {
30 rustc_span::FileName::Real(p) => FileName::Real(p),
31 rustc_span::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)
95 impl fmt::Display for Range {
96 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
97 write!(f, "{}..{}", self.lo, self.hi)
102 pub fn new(lo: usize, hi: usize) -> Range {
106 fn is_empty(self) -> bool {
111 fn contains(self, other: Range) -> bool {
112 if other.is_empty() {
115 !self.is_empty() && self.lo <= other.lo && self.hi >= other.hi
119 fn intersects(self, other: Range) -> bool {
120 if self.is_empty() || other.is_empty() {
123 (self.lo <= other.hi && other.hi <= self.hi)
124 || (other.lo <= self.hi && self.hi <= other.hi)
128 fn adjacent_to(self, other: Range) -> bool {
129 if self.is_empty() || other.is_empty() {
132 self.hi + 1 == other.lo || other.hi + 1 == self.lo
136 /// Returns a new `Range` with lines from `self` and `other` if they were adjacent or
137 /// intersect; returns `None` otherwise.
138 fn merge(self, other: Range) -> Option<Range> {
139 if self.adjacent_to(other) || self.intersects(other) {
141 cmp::min(self.lo, other.lo),
142 cmp::max(self.hi, other.hi),
150 /// A set of lines in files.
152 /// It is represented as a multimap keyed on file names, with values a collection of
153 /// non-overlapping ranges sorted by their start point. An inner `None` is interpreted to mean all
154 /// lines in all files.
155 #[derive(Clone, Debug, Default, PartialEq)]
156 pub struct FileLines(Option<HashMap<FileName, Vec<Range>>>);
158 impl fmt::Display for FileLines {
159 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
161 None => write!(f, "None")?,
163 for (file_name, ranges) in map.iter() {
164 write!(f, "{}: ", file_name)?;
165 write!(f, "{}\n", ranges.iter().format(", "))?;
173 /// Normalizes the ranges so that the invariants for `FileLines` hold: ranges are non-overlapping,
174 /// and ordered by their start point.
175 fn normalize_ranges(ranges: &mut HashMap<FileName, Vec<Range>>) {
176 for ranges in ranges.values_mut() {
178 let mut result = vec![];
179 let mut iter = ranges.iter_mut().peekable();
180 while let Some(next) = iter.next() {
181 let mut next = *next;
182 while let Some(&&mut peek) = iter.peek() {
183 if let Some(merged) = next.merge(peek) {
184 iter.next().unwrap();
197 /// Creates a `FileLines` that contains all lines in all files.
198 pub(crate) fn all() -> FileLines {
202 /// Returns `true` if this `FileLines` contains all lines in all files.
203 pub(crate) fn is_all(&self) -> bool {
207 pub fn from_ranges(mut ranges: HashMap<FileName, Vec<Range>>) -> FileLines {
208 normalize_ranges(&mut ranges);
209 FileLines(Some(ranges))
212 /// Returns an iterator over the files contained in `self`.
213 pub fn files(&self) -> Files<'_> {
214 Files(self.0.as_ref().map(HashMap::keys))
217 /// Returns JSON representation as accepted by the `--file-lines JSON` arg.
218 pub fn to_json_spans(&self) -> Vec<JsonSpan> {
221 Some(file_ranges) => file_ranges
223 .flat_map(|(file, ranges)| ranges.iter().map(move |r| (file, r)))
224 .map(|(file, range)| JsonSpan {
225 file: file.to_owned(),
226 range: (range.lo, range.hi),
232 /// Returns `true` if `self` includes all lines in all files. Otherwise runs `f` on all ranges
233 /// in the designated file (if any) and returns true if `f` ever does.
234 fn file_range_matches<F>(&self, file_name: &FileName, f: F) -> bool
236 F: FnMut(&Range) -> bool,
238 let map = match self.0 {
239 // `None` means "all lines in all files".
241 Some(ref map) => map,
244 match canonicalize_path_string(file_name).and_then(|file| map.get(&file)) {
245 Some(ranges) => ranges.iter().any(f),
250 /// Returns `true` if `range` is fully contained in `self`.
252 pub(crate) fn contains(&self, range: &LineRange) -> bool {
253 self.file_range_matches(&range.file_name(), |r| r.contains(Range::from(range)))
256 /// Returns `true` if any lines in `range` are in `self`.
257 pub(crate) fn intersects(&self, range: &LineRange) -> bool {
258 self.file_range_matches(&range.file_name(), |r| r.intersects(Range::from(range)))
261 /// Returns `true` if `line` from `file_name` is in `self`.
262 pub(crate) fn contains_line(&self, file_name: &FileName, line: usize) -> bool {
263 self.file_range_matches(file_name, |r| r.lo <= line && r.hi >= line)
266 /// Returns `true` if all the lines between `lo` and `hi` from `file_name` are in `self`.
267 pub(crate) fn contains_range(&self, file_name: &FileName, lo: usize, hi: usize) -> bool {
268 self.file_range_matches(file_name, |r| r.contains(Range::new(lo, hi)))
272 /// `FileLines` files iterator.
273 pub struct Files<'a>(Option<::std::collections::hash_map::Keys<'a, FileName, Vec<Range>>>);
275 impl<'a> iter::Iterator for Files<'a> {
276 type Item = &'a FileName;
278 fn next(&mut self) -> Option<&'a FileName> {
279 self.0.as_mut().and_then(Iterator::next)
283 fn canonicalize_path_string(file: &FileName) -> Option<FileName> {
285 FileName::Real(ref path) => path.canonicalize().ok().map(FileName::Real),
286 _ => Some(file.clone()),
290 // This impl is needed for `Config::override_value` to work for use in tests.
291 impl str::FromStr for FileLines {
294 fn from_str(s: &str) -> Result<FileLines, String> {
295 let v: Vec<JsonSpan> = json::from_str(s).map_err(|e| e.to_string())?;
296 let mut m = HashMap::new();
298 let (s, r) = JsonSpan::into_tuple(js)?;
299 m.entry(s).or_insert_with(|| vec![]).push(r);
301 Ok(FileLines::from_ranges(m))
305 // For JSON decoding.
306 #[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Deserialize, Serialize)]
307 pub struct JsonSpan {
309 range: (usize, usize),
313 fn into_tuple(self) -> Result<(FileName, Range), String> {
314 let (lo, hi) = self.range;
315 let canonical = canonicalize_path_string(&self.file)
316 .ok_or_else(|| format!("Can't canonicalize {}", &self.file))?;
317 Ok((canonical, Range::new(lo, hi)))
321 // This impl is needed for inclusion in the `Config` struct. We don't have a toml representation
322 // for `FileLines`, so it will just panic instead.
323 impl<'de> ::serde::de::Deserialize<'de> for FileLines {
324 fn deserialize<D>(_: D) -> Result<Self, D::Error>
326 D: ::serde::de::Deserializer<'de>,
329 "FileLines cannot be deserialized from a project rustfmt.toml file: please \
330 specify it via the `--file-lines` option instead"
335 // We also want to avoid attempting to serialize a FileLines to toml. The
336 // `Config` struct should ensure this impl is never reached.
337 impl ::serde::ser::Serialize for FileLines {
338 fn serialize<S>(&self, _: S) -> Result<S::Ok, S::Error>
340 S: ::serde::ser::Serializer,
342 unreachable!("FileLines cannot be serialized. This is a rustfmt bug.");
351 fn test_range_intersects() {
352 assert!(Range::new(1, 2).intersects(Range::new(1, 1)));
353 assert!(Range::new(1, 2).intersects(Range::new(2, 2)));
354 assert!(!Range::new(1, 2).intersects(Range::new(0, 0)));
355 assert!(!Range::new(1, 2).intersects(Range::new(3, 10)));
356 assert!(!Range::new(1, 3).intersects(Range::new(5, 5)));
360 fn test_range_adjacent_to() {
361 assert!(!Range::new(1, 2).adjacent_to(Range::new(1, 1)));
362 assert!(!Range::new(1, 2).adjacent_to(Range::new(2, 2)));
363 assert!(Range::new(1, 2).adjacent_to(Range::new(0, 0)));
364 assert!(Range::new(1, 2).adjacent_to(Range::new(3, 10)));
365 assert!(!Range::new(1, 3).adjacent_to(Range::new(5, 5)));
369 fn test_range_contains() {
370 assert!(Range::new(1, 2).contains(Range::new(1, 1)));
371 assert!(Range::new(1, 2).contains(Range::new(2, 2)));
372 assert!(!Range::new(1, 2).contains(Range::new(0, 0)));
373 assert!(!Range::new(1, 2).contains(Range::new(3, 10)));
377 fn test_range_merge() {
378 assert_eq!(None, Range::new(1, 3).merge(Range::new(5, 5)));
379 assert_eq!(None, Range::new(4, 7).merge(Range::new(0, 1)));
381 Some(Range::new(3, 7)),
382 Range::new(3, 5).merge(Range::new(4, 7))
385 Some(Range::new(3, 7)),
386 Range::new(3, 5).merge(Range::new(5, 7))
389 Some(Range::new(3, 7)),
390 Range::new(3, 5).merge(Range::new(6, 7))
393 Some(Range::new(3, 7)),
394 Range::new(3, 7).merge(Range::new(4, 5))
398 use super::json::{self, json};
399 use super::{FileLines, FileName};
400 use std::{collections::HashMap, path::PathBuf};
403 fn file_lines_to_json() {
404 let ranges: HashMap<FileName, Vec<Range>> = [
406 FileName::Real(PathBuf::from("src/main.rs")),
407 vec![Range::new(1, 3), Range::new(5, 7)],
410 FileName::Real(PathBuf::from("src/lib.rs")),
411 vec![Range::new(1, 7)],
418 let file_lines = FileLines::from_ranges(ranges);
419 let mut spans = file_lines.to_json_spans();
421 let json = json::to_value(&spans).unwrap();
425 {"file": "src/lib.rs", "range": [1, 7]},
426 {"file": "src/main.rs", "range": [1, 3]},
427 {"file": "src/main.rs", "range": [5, 7]},