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 serde::{ser, Deserialize, Deserializer, Serialize, Serializer};
10 use serde_json as json;
12 use syntax::source_map::{self, SourceFile, SourceMap, Span};
14 /// A range of lines in a file, inclusive of both ends.
15 pub struct LineRange {
16 pub file: Rc<SourceFile>,
21 /// Defines the name of an input - either a file or stdin.
22 #[derive(Clone, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
28 impl From<source_map::FileName> for FileName {
29 fn from(name: source_map::FileName) -> FileName {
31 source_map::FileName::Real(p) => FileName::Real(p),
32 source_map::FileName::Custom(ref f) if f == "stdin" => FileName::Stdin,
38 impl fmt::Display for FileName {
39 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
41 FileName::Real(p) => write!(f, "{}", p.to_str().unwrap()),
42 FileName::Stdin => write!(f, "stdin"),
47 impl<'de> Deserialize<'de> for FileName {
48 fn deserialize<D>(deserializer: D) -> Result<FileName, D::Error>
52 let s = String::deserialize(deserializer)?;
56 Ok(FileName::Real(s.into()))
61 impl Serialize for FileName {
62 fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
67 FileName::Stdin => Ok("stdin"),
68 FileName::Real(path) => path
70 .ok_or_else(|| ser::Error::custom("path can't be serialized as UTF-8 string")),
73 s.and_then(|s| serializer.serialize_str(s))
78 pub fn file_name(&self) -> FileName {
79 self.file.name.clone().into()
82 pub(crate) fn from_span(source_map: &SourceMap, span: Span) -> LineRange {
83 let lo_char_pos = source_map.lookup_char_pos(span.lo());
84 let hi_char_pos = source_map.lookup_char_pos(span.hi());
85 debug_assert!(lo_char_pos.file.name == hi_char_pos.file.name);
87 file: lo_char_pos.file.clone(),
94 /// A range that is inclusive of both ends.
95 #[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord, Deserialize)]
101 impl<'a> From<&'a LineRange> for Range {
102 fn from(range: &'a LineRange) -> Range {
103 Range::new(range.lo, range.hi)
107 impl fmt::Display for Range {
108 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
109 write!(f, "{}..{}", self.lo, self.hi)
114 pub fn new(lo: usize, hi: usize) -> Range {
118 fn is_empty(self) -> bool {
123 fn contains(self, other: Range) -> bool {
124 if other.is_empty() {
127 !self.is_empty() && self.lo <= other.lo && self.hi >= other.hi
131 fn intersects(self, other: Range) -> bool {
132 if self.is_empty() || other.is_empty() {
135 (self.lo <= other.hi && other.hi <= self.hi)
136 || (other.lo <= self.hi && self.hi <= other.hi)
140 fn adjacent_to(self, other: Range) -> bool {
141 if self.is_empty() || other.is_empty() {
144 self.hi + 1 == other.lo || other.hi + 1 == self.lo
148 /// Returns a new `Range` with lines from `self` and `other` if they were adjacent or
149 /// intersect; returns `None` otherwise.
150 fn merge(self, other: Range) -> Option<Range> {
151 if self.adjacent_to(other) || self.intersects(other) {
153 cmp::min(self.lo, other.lo),
154 cmp::max(self.hi, other.hi),
162 /// A set of lines in files.
164 /// It is represented as a multimap keyed on file names, with values a collection of
165 /// non-overlapping ranges sorted by their start point. An inner `None` is interpreted to mean all
166 /// lines in all files.
167 #[derive(Clone, Debug, Default, PartialEq)]
168 pub struct FileLines(Option<HashMap<FileName, Vec<Range>>>);
170 impl fmt::Display for FileLines {
171 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
173 None => write!(f, "None")?,
175 for (file_name, ranges) in map.iter() {
176 write!(f, "{}: ", file_name)?;
177 write!(f, "{}\n", ranges.iter().format(", "))?;
185 /// Normalizes the ranges so that the invariants for `FileLines` hold: ranges are non-overlapping,
186 /// and ordered by their start point.
187 fn normalize_ranges(ranges: &mut HashMap<FileName, Vec<Range>>) {
188 for ranges in ranges.values_mut() {
190 let mut result = vec![];
191 let mut iter = ranges.iter_mut().peekable();
192 while let Some(next) = iter.next() {
193 let mut next = *next;
194 while let Some(&&mut peek) = iter.peek() {
195 if let Some(merged) = next.merge(peek) {
196 iter.next().unwrap();
209 /// Creates a `FileLines` that contains all lines in all files.
210 pub(crate) fn all() -> FileLines {
214 /// Returns `true` if this `FileLines` contains all lines in all files.
215 pub(crate) fn is_all(&self) -> bool {
219 pub fn from_ranges(mut ranges: HashMap<FileName, Vec<Range>>) -> FileLines {
220 normalize_ranges(&mut ranges);
221 FileLines(Some(ranges))
224 /// Returns an iterator over the files contained in `self`.
225 pub fn files(&self) -> Files<'_> {
226 Files(self.0.as_ref().map(HashMap::keys))
229 /// Returns JSON representation as accepted by the `--file-lines JSON` arg.
230 pub fn to_json_spans(&self) -> Vec<JsonSpan> {
233 Some(file_ranges) => file_ranges
235 .flat_map(|(file, ranges)| ranges.iter().map(move |r| (file, r)))
236 .map(|(file, range)| JsonSpan {
237 file: file.to_owned(),
238 range: (range.lo, range.hi),
244 /// Returns `true` if `self` includes all lines in all files. Otherwise runs `f` on all ranges
245 /// in the designated file (if any) and returns true if `f` ever does.
246 fn file_range_matches<F>(&self, file_name: &FileName, f: F) -> bool
248 F: FnMut(&Range) -> bool,
250 let map = match self.0 {
251 // `None` means "all lines in all files".
253 Some(ref map) => map,
256 match canonicalize_path_string(file_name).and_then(|file| map.get(&file)) {
257 Some(ranges) => ranges.iter().any(f),
262 /// Returns `true` if `range` is fully contained in `self`.
264 pub(crate) fn contains(&self, range: &LineRange) -> bool {
265 self.file_range_matches(&range.file_name(), |r| r.contains(Range::from(range)))
268 /// Returns `true` if any lines in `range` are in `self`.
269 pub(crate) fn intersects(&self, range: &LineRange) -> bool {
270 self.file_range_matches(&range.file_name(), |r| r.intersects(Range::from(range)))
273 /// Returns `true` if `line` from `file_name` is in `self`.
274 pub(crate) fn contains_line(&self, file_name: &FileName, line: usize) -> bool {
275 self.file_range_matches(file_name, |r| r.lo <= line && r.hi >= line)
278 /// Returns `true` if all the lines between `lo` and `hi` from `file_name` are in `self`.
279 pub(crate) fn contains_range(&self, file_name: &FileName, lo: usize, hi: usize) -> bool {
280 self.file_range_matches(file_name, |r| r.contains(Range::new(lo, hi)))
284 /// `FileLines` files iterator.
285 pub struct Files<'a>(Option<::std::collections::hash_map::Keys<'a, FileName, Vec<Range>>>);
287 impl<'a> iter::Iterator for Files<'a> {
288 type Item = &'a FileName;
290 fn next(&mut self) -> Option<&'a FileName> {
291 self.0.as_mut().and_then(Iterator::next)
295 fn canonicalize_path_string(file: &FileName) -> Option<FileName> {
297 FileName::Real(ref path) => path.canonicalize().ok().map(FileName::Real),
298 _ => Some(file.clone()),
302 // This impl is needed for `Config::override_value` to work for use in tests.
303 impl str::FromStr for FileLines {
306 fn from_str(s: &str) -> Result<FileLines, String> {
307 let v: Vec<JsonSpan> = json::from_str(s).map_err(|e| e.to_string())?;
308 let mut m = HashMap::new();
310 let (s, r) = JsonSpan::into_tuple(js)?;
311 m.entry(s).or_insert_with(|| vec![]).push(r);
313 Ok(FileLines::from_ranges(m))
317 // For JSON decoding.
318 #[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Deserialize, Serialize)]
319 pub struct JsonSpan {
321 range: (usize, usize),
325 fn into_tuple(self) -> Result<(FileName, Range), String> {
326 let (lo, hi) = self.range;
327 let canonical = canonicalize_path_string(&self.file)
328 .ok_or_else(|| format!("Can't canonicalize {}", &self.file))?;
329 Ok((canonical, Range::new(lo, hi)))
333 // This impl is needed for inclusion in the `Config` struct. We don't have a toml representation
334 // for `FileLines`, so it will just panic instead.
335 impl<'de> ::serde::de::Deserialize<'de> for FileLines {
336 fn deserialize<D>(_: D) -> Result<Self, D::Error>
338 D: ::serde::de::Deserializer<'de>,
341 "FileLines cannot be deserialized from a project rustfmt.toml file: please \
342 specify it via the `--file-lines` option instead"
347 // We also want to avoid attempting to serialize a FileLines to toml. The
348 // `Config` struct should ensure this impl is never reached.
349 impl ::serde::ser::Serialize for FileLines {
350 fn serialize<S>(&self, _: S) -> Result<S::Ok, S::Error>
352 S: ::serde::ser::Serializer,
354 unreachable!("FileLines cannot be serialized. This is a rustfmt bug.");
363 fn test_range_intersects() {
364 assert!(Range::new(1, 2).intersects(Range::new(1, 1)));
365 assert!(Range::new(1, 2).intersects(Range::new(2, 2)));
366 assert!(!Range::new(1, 2).intersects(Range::new(0, 0)));
367 assert!(!Range::new(1, 2).intersects(Range::new(3, 10)));
368 assert!(!Range::new(1, 3).intersects(Range::new(5, 5)));
372 fn test_range_adjacent_to() {
373 assert!(!Range::new(1, 2).adjacent_to(Range::new(1, 1)));
374 assert!(!Range::new(1, 2).adjacent_to(Range::new(2, 2)));
375 assert!(Range::new(1, 2).adjacent_to(Range::new(0, 0)));
376 assert!(Range::new(1, 2).adjacent_to(Range::new(3, 10)));
377 assert!(!Range::new(1, 3).adjacent_to(Range::new(5, 5)));
381 fn test_range_contains() {
382 assert!(Range::new(1, 2).contains(Range::new(1, 1)));
383 assert!(Range::new(1, 2).contains(Range::new(2, 2)));
384 assert!(!Range::new(1, 2).contains(Range::new(0, 0)));
385 assert!(!Range::new(1, 2).contains(Range::new(3, 10)));
389 fn test_range_merge() {
390 assert_eq!(None, Range::new(1, 3).merge(Range::new(5, 5)));
391 assert_eq!(None, Range::new(4, 7).merge(Range::new(0, 1)));
393 Some(Range::new(3, 7)),
394 Range::new(3, 5).merge(Range::new(4, 7))
397 Some(Range::new(3, 7)),
398 Range::new(3, 5).merge(Range::new(5, 7))
401 Some(Range::new(3, 7)),
402 Range::new(3, 5).merge(Range::new(6, 7))
405 Some(Range::new(3, 7)),
406 Range::new(3, 7).merge(Range::new(4, 5))
410 use super::json::{self, json};
411 use super::{FileLines, FileName};
412 use std::{collections::HashMap, path::PathBuf};
415 fn file_lines_to_json() {
416 let ranges: HashMap<FileName, Vec<Range>> = [
418 FileName::Real(PathBuf::from("src/main.rs")),
419 vec![Range::new(1, 3), Range::new(5, 7)],
422 FileName::Real(PathBuf::from("src/lib.rs")),
423 vec![Range::new(1, 7)],
430 let file_lines = FileLines::from_ranges(ranges);
431 let mut spans = file_lines.to_json_spans();
433 let json = json::to_value(&spans).unwrap();
437 {"file": "src/lib.rs", "range": [1, 7]},
438 {"file": "src/main.rs", "range": [1, 3]},
439 {"file": "src/main.rs", "range": [5, 7]},