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Auto merge of rust-lang#128146 - notriddle:notriddle/natsortfixes, r=…
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…GuillaumeGomez

rustdoc: clean up and fix ord violations in item sorting

Based on rust-lang#128139 with a few minor changes:

- The name sorting function is changed to follow the [version sort] from the style guide
- the `cmp` function is redesigned to more obviously make a partial order, by always return `cmp()` of the same variable as the `!=` above

[version sort]: https://doc.rust-lang.org/nightly/style-guide/index.html#sorting
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bors committed Jul 24, 2024
2 parents 6106b05 + 5384692 commit c1a6199
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Showing 2 changed files with 119 additions and 70 deletions.
187 changes: 118 additions & 69 deletions src/librustdoc/html/render/print_item.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -316,7 +316,8 @@ trait ItemTemplate<'a, 'cx: 'a>: rinja::Template + fmt::Display {
fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items: &[clean::Item]) {
write!(w, "{}", document(cx, item, None, HeadingOffset::H2));

let mut indices = (0..items.len()).filter(|i| !items[*i].is_stripped()).collect::<Vec<usize>>();
let mut not_stripped_items =
items.iter().filter(|i| !i.is_stripped()).enumerate().collect::<Vec<_>>();

// the order of item types in the listing
fn reorder(ty: ItemType) -> u8 {
Expand All @@ -338,37 +339,29 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
}
}

fn cmp(
i1: &clean::Item,
i2: &clean::Item,
idx1: usize,
idx2: usize,
tcx: TyCtxt<'_>,
) -> Ordering {
let ty1 = i1.type_();
let ty2 = i2.type_();
if item_ty_to_section(ty1) != item_ty_to_section(ty2)
|| (ty1 != ty2 && (ty1 == ItemType::ExternCrate || ty2 == ItemType::ExternCrate))
{
return (reorder(ty1), idx1).cmp(&(reorder(ty2), idx2));
}
let s1 = i1.stability(tcx).as_ref().map(|s| s.level);
let s2 = i2.stability(tcx).as_ref().map(|s| s.level);
if let (Some(a), Some(b)) = (s1, s2) {
match (a.is_stable(), b.is_stable()) {
(true, true) | (false, false) => {}
(false, true) => return Ordering::Greater,
(true, false) => return Ordering::Less,
}
fn cmp(i1: &clean::Item, i2: &clean::Item, tcx: TyCtxt<'_>) -> Ordering {
let rty1 = reorder(i1.type_());
let rty2 = reorder(i2.type_());
if rty1 != rty2 {
return rty1.cmp(&rty2);
}
let is_stable1 = i1.stability(tcx).as_ref().map(|s| s.level.is_stable()).unwrap_or(true);
let is_stable2 = i2.stability(tcx).as_ref().map(|s| s.level.is_stable()).unwrap_or(true);
if is_stable1 != is_stable2 {
// true is bigger than false in the standard bool ordering,
// but we actually want stable items to come first
return is_stable2.cmp(&is_stable1);
}
let lhs = i1.name.unwrap_or(kw::Empty);
let rhs = i2.name.unwrap_or(kw::Empty);
compare_names(lhs.as_str(), rhs.as_str())
}

let tcx = cx.tcx();

match cx.shared.module_sorting {
ModuleSorting::Alphabetical => {
indices.sort_by(|&i1, &i2| cmp(&items[i1], &items[i2], i1, i2, cx.tcx()));
not_stripped_items.sort_by(|(_, i1), (_, i2)| cmp(i1, i2, tcx));
}
ModuleSorting::DeclarationOrder => {}
}
Expand All @@ -391,24 +384,19 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
// can be identical even if the elements are different (mostly in imports).
// So in case this is an import, we keep everything by adding a "unique id"
// (which is the position in the vector).
indices.dedup_by_key(|i| {
not_stripped_items.dedup_by_key(|(idx, i)| {
(
items[*i].item_id,
if items[*i].name.is_some() { Some(full_path(cx, &items[*i])) } else { None },
items[*i].type_(),
if items[*i].is_import() { *i } else { 0 },
i.item_id,
if i.name.is_some() { Some(full_path(cx, i)) } else { None },
i.type_(),
if i.is_import() { *idx } else { 0 },
)
});

debug!("{indices:?}");
debug!("{not_stripped_items:?}");
let mut last_section = None;

for &idx in &indices {
let myitem = &items[idx];
if myitem.is_stripped() {
continue;
}

for (_, myitem) in &not_stripped_items {
let my_section = item_ty_to_section(myitem.type_());
if Some(my_section) != last_section {
if last_section.is_some() {
Expand All @@ -424,7 +412,6 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
);
}

let tcx = cx.tcx();
match *myitem.kind {
clean::ExternCrateItem { ref src } => {
use crate::html::format::anchor;
Expand Down Expand Up @@ -453,7 +440,7 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
let stab_tags = if let Some(import_def_id) = import.source.did {
// Just need an item with the correct def_id and attrs
let import_item =
clean::Item { item_id: import_def_id.into(), ..myitem.clone() };
clean::Item { item_id: import_def_id.into(), ..(*myitem).clone() };

let stab_tags = Some(extra_info_tags(&import_item, item, tcx).to_string());
stab_tags
Expand Down Expand Up @@ -2010,40 +1997,102 @@ fn item_keyword(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item) {
}

/// Compare two strings treating multi-digit numbers as single units (i.e. natural sort order).
pub(crate) fn compare_names(mut lhs: &str, mut rhs: &str) -> Ordering {
/// Takes a non-numeric and a numeric part from the given &str.
fn take_parts<'a>(s: &mut &'a str) -> (&'a str, &'a str) {
let i = s.find(|c: char| c.is_ascii_digit());
let (a, b) = s.split_at(i.unwrap_or(s.len()));
let i = b.find(|c: char| !c.is_ascii_digit());
let (b, c) = b.split_at(i.unwrap_or(b.len()));
*s = c;
(a, b)
}

while !lhs.is_empty() || !rhs.is_empty() {
let (la, lb) = take_parts(&mut lhs);
let (ra, rb) = take_parts(&mut rhs);
// First process the non-numeric part.
match la.cmp(ra) {
Ordering::Equal => (),
x => return x,
}
// Then process the numeric part, if both sides have one (and they fit in a u64).
if let (Ok(ln), Ok(rn)) = (lb.parse::<u64>(), rb.parse::<u64>()) {
match ln.cmp(&rn) {
Ordering::Equal => (),
x => return x,
///
/// This code is copied from [`rustfmt`], and should probably be released as a crate at some point.
///
/// [`rustfmt`]:https://github.com/rust-lang/rustfmt/blob/rustfmt-2.0.0-rc.2/src/formatting/reorder.rs#L32
pub(crate) fn compare_names(left: &str, right: &str) -> Ordering {
let mut left = left.chars().peekable();
let mut right = right.chars().peekable();

loop {
// The strings are equal so far and not inside a number in both sides
let (l, r) = match (left.next(), right.next()) {
// Is this the end of both strings?
(None, None) => return Ordering::Equal,
// If for one, the shorter one is considered smaller
(None, Some(_)) => return Ordering::Less,
(Some(_), None) => return Ordering::Greater,
(Some(l), Some(r)) => (l, r),
};
let next_ordering = match (l.to_digit(10), r.to_digit(10)) {
// If neither is a digit, just compare them
(None, None) => Ord::cmp(&l, &r),
// The one with shorter non-digit run is smaller
// For `strverscmp` it's smaller iff next char in longer is greater than digits
(None, Some(_)) => Ordering::Greater,
(Some(_), None) => Ordering::Less,
// If both start numbers, we have to compare the numbers
(Some(l), Some(r)) => {
if l == 0 || r == 0 {
// Fraction mode: compare as if there was leading `0.`
let ordering = Ord::cmp(&l, &r);
if ordering != Ordering::Equal {
return ordering;
}
loop {
// Get next pair
let (l, r) = match (left.peek(), right.peek()) {
// Is this the end of both strings?
(None, None) => return Ordering::Equal,
// If for one, the shorter one is considered smaller
(None, Some(_)) => return Ordering::Less,
(Some(_), None) => return Ordering::Greater,
(Some(l), Some(r)) => (l, r),
};
// Are they digits?
match (l.to_digit(10), r.to_digit(10)) {
// If out of digits, use the stored ordering due to equal length
(None, None) => break Ordering::Equal,
// If one is shorter, it's smaller
(None, Some(_)) => return Ordering::Less,
(Some(_), None) => return Ordering::Greater,
// If both are digits, consume them and take into account
(Some(l), Some(r)) => {
left.next();
right.next();
let ordering = Ord::cmp(&l, &r);
if ordering != Ordering::Equal {
return ordering;
}
}
}
}
} else {
// Integer mode
let mut same_length_ordering = Ord::cmp(&l, &r);
loop {
// Get next pair
let (l, r) = match (left.peek(), right.peek()) {
// Is this the end of both strings?
(None, None) => return same_length_ordering,
// If for one, the shorter one is considered smaller
(None, Some(_)) => return Ordering::Less,
(Some(_), None) => return Ordering::Greater,
(Some(l), Some(r)) => (l, r),
};
// Are they digits?
match (l.to_digit(10), r.to_digit(10)) {
// If out of digits, use the stored ordering due to equal length
(None, None) => break same_length_ordering,
// If one is shorter, it's smaller
(None, Some(_)) => return Ordering::Less,
(Some(_), None) => return Ordering::Greater,
// If both are digits, consume them and take into account
(Some(l), Some(r)) => {
left.next();
right.next();
same_length_ordering = same_length_ordering.then(Ord::cmp(&l, &r));
}
}
}
}
}
}
// Then process the numeric part again, but this time as strings.
match lb.cmp(rb) {
Ordering::Equal => (),
x => return x,
};
if next_ordering != Ordering::Equal {
return next_ordering;
}
}

Ordering::Equal
}

pub(super) fn full_path(cx: &Context<'_>, item: &clean::Item) -> String {
Expand Down
2 changes: 1 addition & 1 deletion src/librustdoc/html/render/tests.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@ fn test_compare_names() {
#[test]
fn test_name_sorting() {
let names = [
"Apple", "Banana", "Fruit", "Fruit0", "Fruit00", "Fruit01", "Fruit1", "Fruit02", "Fruit2",
"Apple", "Banana", "Fruit", "Fruit0", "Fruit00", "Fruit01", "Fruit02", "Fruit1", "Fruit2",
"Fruit20", "Fruit30x", "Fruit100", "Pear",
];
let mut sorted = names.to_owned();
Expand Down

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