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use std::{cmp, iter, str};
use std::collections::HashMap;
use std::rc::Rc;
use serde::de::{Deserialize, Deserializer};
use serde_json as json;
use syntax::codemap::{FileMap, FileName};
pub struct LineRange {
pub file: Rc<FileMap>,
pub lo: usize,
pub hi: usize,
}
impl LineRange {
pub fn file_name(&self) -> &FileName {
&self.file.name
}
}
#[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord, Deserialize)]
pub struct Range {
lo: usize,
hi: usize,
}
impl<'a> From<&'a LineRange> for Range {
fn from(range: &'a LineRange) -> Range {
Range::new(range.lo, range.hi)
}
}
impl Range {
pub fn new(lo: usize, hi: usize) -> Range {
Range { lo, hi }
}
fn is_empty(self) -> bool {
self.lo > self.hi
}
fn contains(self, other: Range) -> bool {
if other.is_empty() {
true
} else {
!self.is_empty() && self.lo <= other.lo && self.hi >= other.hi
}
}
fn intersects(self, other: Range) -> bool {
if self.is_empty() || other.is_empty() {
false
} else {
(self.lo <= other.hi && other.hi <= self.hi)
|| (other.lo <= self.hi && self.hi <= other.hi)
}
}
fn adjacent_to(self, other: Range) -> bool {
if self.is_empty() || other.is_empty() {
false
} else {
self.hi + 1 == other.lo || other.hi + 1 == self.lo
}
}
fn merge(self, other: Range) -> Option<Range> {
if self.adjacent_to(other) || self.intersects(other) {
Some(Range::new(
cmp::min(self.lo, other.lo),
cmp::max(self.hi, other.hi),
))
} else {
None
}
}
}
#[derive(Clone, Debug, Default)]
pub struct FileLines(Option<HashMap<FileName, Vec<Range>>>);
fn normalize_ranges(ranges: &mut HashMap<FileName, Vec<Range>>) {
for ranges in ranges.values_mut() {
ranges.sort();
let mut result = vec![];
{
let mut iter = ranges.into_iter().peekable();
while let Some(next) = iter.next() {
let mut next = *next;
while let Some(&&mut peek) = iter.peek() {
if let Some(merged) = next.merge(peek) {
iter.next().unwrap();
next = merged;
} else {
break;
}
}
result.push(next)
}
}
*ranges = result;
}
}
impl FileLines {
pub fn all() -> FileLines {
FileLines(None)
}
pub fn is_all(&self) -> bool {
self.0.is_none()
}
pub fn from_ranges(mut ranges: HashMap<FileName, Vec<Range>>) -> FileLines {
normalize_ranges(&mut ranges);
FileLines(Some(ranges))
}
pub fn files(&self) -> Files {
Files(self.0.as_ref().map(|m| m.keys()))
}
fn file_range_matches<F>(&self, file_name: &FileName, f: F) -> bool
where
F: FnMut(&Range) -> bool,
{
let map = match self.0 {
None => return true,
Some(ref map) => map,
};
match canonicalize_path_string(file_name).and_then(|file| map.get(&file)) {
Some(ranges) => ranges.iter().any(f),
None => false,
}
}
pub fn contains(&self, range: &LineRange) -> bool {
self.file_range_matches(range.file_name(), |r| r.contains(Range::from(range)))
}
pub fn intersects(&self, range: &LineRange) -> bool {
self.file_range_matches(range.file_name(), |r| r.intersects(Range::from(range)))
}
pub fn contains_line(&self, file_name: &FileName, line: usize) -> bool {
self.file_range_matches(file_name, |r| r.lo <= line && r.hi >= line)
}
pub fn intersects_range(&self, file_name: &FileName, lo: usize, hi: usize) -> bool {
self.file_range_matches(file_name, |r| r.intersects(Range::new(lo, hi)))
}
}
pub struct Files<'a>(Option<::std::collections::hash_map::Keys<'a, FileName, Vec<Range>>>);
impl<'a> iter::Iterator for Files<'a> {
type Item = &'a FileName;
fn next(&mut self) -> Option<&'a FileName> {
self.0.as_mut().and_then(Iterator::next)
}
}
fn canonicalize_path_string(file: &FileName) -> Option<FileName> {
match *file {
FileName::Real(ref path) => path.canonicalize().ok().map(FileName::Real),
_ => Some(file.clone()),
}
}
impl str::FromStr for FileLines {
type Err = String;
fn from_str(s: &str) -> Result<FileLines, String> {
let v: Vec<JsonSpan> = json::from_str(s).map_err(|e| e.to_string())?;
let mut m = HashMap::new();
for js in v {
let (s, r) = JsonSpan::into_tuple(js)?;
m.entry(s).or_insert_with(|| vec![]).push(r);
}
Ok(FileLines::from_ranges(m))
}
}
#[derive(Clone, Debug, Deserialize)]
struct JsonSpan {
#[serde(deserialize_with = "deserialize_filename")]
file: FileName,
range: (usize, usize),
}
fn deserialize_filename<'de, D: Deserializer<'de>>(d: D) -> Result<FileName, D::Error> {
let s = String::deserialize(d)?;
if s == "stdin" {
Ok(FileName::Custom(s))
} else {
Ok(FileName::Real(s.into()))
}
}
impl JsonSpan {
fn into_tuple(self) -> Result<(FileName, Range), String> {
let (lo, hi) = self.range;
let canonical = canonicalize_path_string(&self.file)
.ok_or_else(|| format!("Can't canonicalize {}", &self.file))?;
Ok((canonical, Range::new(lo, hi)))
}
}
impl<'de> ::serde::de::Deserialize<'de> for FileLines {
fn deserialize<D>(_: D) -> Result<Self, D::Error>
where
D: ::serde::de::Deserializer<'de>,
{
panic!(
"FileLines cannot be deserialized from a project rustfmt.toml file: please \
specify it via the `--file-lines` option instead"
);
}
}
impl ::serde::ser::Serialize for FileLines {
fn serialize<S>(&self, _: S) -> Result<S::Ok, S::Error>
where
S: ::serde::ser::Serializer,
{
unreachable!("FileLines cannot be serialized. This is a rustfmt bug.");
}
}
#[cfg(test)]
mod test {
use super::Range;
#[test]
fn test_range_intersects() {
assert!(Range::new(1, 2).intersects(Range::new(1, 1)));
assert!(Range::new(1, 2).intersects(Range::new(2, 2)));
assert!(!Range::new(1, 2).intersects(Range::new(0, 0)));
assert!(!Range::new(1, 2).intersects(Range::new(3, 10)));
assert!(!Range::new(1, 3).intersects(Range::new(5, 5)));
}
#[test]
fn test_range_adjacent_to() {
assert!(!Range::new(1, 2).adjacent_to(Range::new(1, 1)));
assert!(!Range::new(1, 2).adjacent_to(Range::new(2, 2)));
assert!(Range::new(1, 2).adjacent_to(Range::new(0, 0)));
assert!(Range::new(1, 2).adjacent_to(Range::new(3, 10)));
assert!(!Range::new(1, 3).adjacent_to(Range::new(5, 5)));
}
#[test]
fn test_range_contains() {
assert!(Range::new(1, 2).contains(Range::new(1, 1)));
assert!(Range::new(1, 2).contains(Range::new(2, 2)));
assert!(!Range::new(1, 2).contains(Range::new(0, 0)));
assert!(!Range::new(1, 2).contains(Range::new(3, 10)));
}
#[test]
fn test_range_merge() {
assert_eq!(None, Range::new(1, 3).merge(Range::new(5, 5)));
assert_eq!(None, Range::new(4, 7).merge(Range::new(0, 1)));
assert_eq!(
Some(Range::new(3, 7)),
Range::new(3, 5).merge(Range::new(4, 7))
);
assert_eq!(
Some(Range::new(3, 7)),
Range::new(3, 5).merge(Range::new(5, 7))
);
assert_eq!(
Some(Range::new(3, 7)),
Range::new(3, 5).merge(Range::new(6, 7))
);
assert_eq!(
Some(Range::new(3, 7)),
Range::new(3, 7).merge(Range::new(4, 5))
);
}
}