diff options
| -rw-r--r-- | Configurations.md | 19 | ||||
| -rw-r--r-- | src/config/options.rs | 2 | ||||
| -rw-r--r-- | src/imports.rs | 146 | ||||
| -rw-r--r-- | src/reorder.rs | 1 | ||||
| -rw-r--r-- | tests/source/imports_granularity_one.rs | 60 | ||||
| -rw-r--r-- | tests/target/imports_granularity_one.rs | 79 |
6 files changed, 288 insertions, 19 deletions
diff --git a/Configurations.md b/Configurations.md index d2e5613eba9..469deccc56e 100644 --- a/Configurations.md +++ b/Configurations.md @@ -1679,7 +1679,7 @@ pub enum Foo {} How imports should be grouped into `use` statements. Imports will be merged or split to the configured level of granularity. - **Default value**: `Preserve` -- **Possible values**: `Preserve`, `Crate`, `Module`, `Item` +- **Possible values**: `Preserve`, `Crate`, `Module`, `Item`, `One` - **Stable**: No #### `Preserve` (default): @@ -1733,6 +1733,23 @@ use qux::h; use qux::i; ``` +#### `One`: + +Merge all imports into a single `use` statement as long as they have the same visibility. + +```rust +pub use foo::{x, y}; +use { + bar::{ + a, + b::{self, f, g}, + c, + d::e, + }, + qux::{h, i}, +}; +``` + ## `merge_imports` This option is deprecated. Use `imports_granularity = "Crate"` instead. diff --git a/src/config/options.rs b/src/config/options.rs index 3b91021813c..db15ee97a40 100644 --- a/src/config/options.rs +++ b/src/config/options.rs @@ -125,6 +125,8 @@ pub enum ImportGranularity { Module, /// Use one `use` statement per imported item. Item, + /// Use one `use` statement including all items. + One, } #[config_type] diff --git a/src/imports.rs b/src/imports.rs index 64d78605f0c..5ac79936689 100644 --- a/src/imports.rs +++ b/src/imports.rs @@ -138,6 +138,29 @@ impl UseSegment { } } + // Check if self == other with their aliases removed. + fn equal_except_alias(&self, other: &Self) -> bool { + match (self, other) { + (UseSegment::Ident(ref s1, _), UseSegment::Ident(ref s2, _)) => s1 == s2, + (UseSegment::Slf(_), UseSegment::Slf(_)) + | (UseSegment::Super(_), UseSegment::Super(_)) + | (UseSegment::Crate(_), UseSegment::Crate(_)) + | (UseSegment::Glob, UseSegment::Glob) => true, + (UseSegment::List(ref list1), UseSegment::List(ref list2)) => list1 == list2, + _ => false, + } + } + + fn get_alias(&self) -> Option<&str> { + match self { + UseSegment::Ident(_, a) + | UseSegment::Slf(a) + | UseSegment::Super(a) + | UseSegment::Crate(a) => a.as_deref(), + _ => None, + } + } + fn from_path_segment( context: &RewriteContext<'_>, path_seg: &ast::PathSegment, @@ -558,6 +581,7 @@ impl UseTree { SharedPrefix::Module => { self.path[..self.path.len() - 1] == other.path[..other.path.len() - 1] } + SharedPrefix::One => true, } } } @@ -598,7 +622,7 @@ impl UseTree { fn merge(&mut self, other: &UseTree, merge_by: SharedPrefix) { let mut prefix = 0; for (a, b) in self.path.iter().zip(other.path.iter()) { - if *a == *b { + if a.equal_except_alias(b) { prefix += 1; } else { break; @@ -633,14 +657,20 @@ fn merge_rest( return Some(new_path); } } else if len == 1 { - let rest = if a.len() == len { &b[1..] } else { &a[1..] }; - return Some(vec![ - b[0].clone(), - UseSegment::List(vec![ - UseTree::from_path(vec![UseSegment::Slf(None)], DUMMY_SP), - UseTree::from_path(rest.to_vec(), DUMMY_SP), - ]), - ]); + let (common, rest) = if a.len() == len { + (&a[0], &b[1..]) + } else { + (&b[0], &a[1..]) + }; + let mut list = vec![UseTree::from_path( + vec![UseSegment::Slf(common.get_alias().map(ToString::to_string))], + DUMMY_SP, + )]; + match rest { + [UseSegment::List(rest_list)] => list.extend(rest_list.clone()), + _ => list.push(UseTree::from_path(rest.to_vec(), DUMMY_SP)), + } + return Some(vec![b[0].clone(), UseSegment::List(list)]); } else { len -= 1; } @@ -655,18 +685,54 @@ fn merge_rest( } fn merge_use_trees_inner(trees: &mut Vec<UseTree>, use_tree: UseTree, merge_by: SharedPrefix) { - let similar_trees = trees - .iter_mut() - .filter(|tree| tree.share_prefix(&use_tree, merge_by)); + struct SimilarTree<'a> { + similarity: usize, + path_len: usize, + tree: &'a mut UseTree, + } + + let similar_trees = trees.iter_mut().filter_map(|tree| { + if tree.share_prefix(&use_tree, merge_by) { + // In the case of `SharedPrefix::One`, `similarity` is used for deciding with which + // tree `use_tree` should be merge. + // In other cases `similarity` won't be used, so set it to `0` as a dummy value. + let similarity = if merge_by == SharedPrefix::One { + tree.path + .iter() + .zip(&use_tree.path) + .take_while(|(a, b)| a.equal_except_alias(b)) + .count() + } else { + 0 + }; + + let path_len = tree.path.len(); + Some(SimilarTree { + similarity, + tree, + path_len, + }) + } else { + None + } + }); + if use_tree.path.len() == 1 && merge_by == SharedPrefix::Crate { - if let Some(tree) = similar_trees.min_by_key(|tree| tree.path.len()) { - if tree.path.len() == 1 { + if let Some(tree) = similar_trees.min_by_key(|tree| tree.path_len) { + if tree.path_len == 1 { + return; + } + } + } else if merge_by == SharedPrefix::One { + if let Some(sim_tree) = similar_trees.max_by_key(|tree| tree.similarity) { + if sim_tree.similarity > 0 { + sim_tree.tree.merge(&use_tree, merge_by); return; } } - } else if let Some(tree) = similar_trees.max_by_key(|tree| tree.path.len()) { - if tree.path.len() > 1 { - tree.merge(&use_tree, merge_by); + } else if let Some(sim_tree) = similar_trees.max_by_key(|tree| tree.path_len) { + if sim_tree.path_len > 1 { + sim_tree.tree.merge(&use_tree, merge_by); return; } } @@ -880,6 +946,7 @@ impl Rewrite for UseTree { pub(crate) enum SharedPrefix { Crate, Module, + One, } #[cfg(test)] @@ -904,7 +971,7 @@ mod test { } fn eat(&mut self, c: char) { - assert!(self.input.next().unwrap() == c); + assert_eq!(self.input.next().unwrap(), c); } fn push_segment( @@ -1095,6 +1162,49 @@ mod test { } #[test] + fn test_use_tree_merge_one() { + test_merge!(One, ["a", "b"], ["{a, b}"]); + + test_merge!(One, ["a::{aa, ab}", "b", "a"], ["{a::{self, aa, ab}, b}"]); + + test_merge!(One, ["a as x", "b as y"], ["{a as x, b as y}"]); + + test_merge!( + One, + ["a::{aa as xa, ab}", "b", "a"], + ["{a::{self, aa as xa, ab}, b}"] + ); + + test_merge!( + One, + ["a", "a::{aa, ab::{aba, abb}}"], + ["a::{self, aa, ab::{aba, abb}}"] + ); + + test_merge!(One, ["a", "b::{ba, *}"], ["{a, b::{ba, *}}"]); + + test_merge!(One, ["a", "b", "a::aa"], ["{a::{self, aa}, b}"]); + + test_merge!( + One, + ["a::aa::aaa", "a::ac::aca", "a::aa::*"], + ["a::{aa::{aaa, *}, ac::aca}"] + ); + + test_merge!( + One, + ["a", "b::{ba, bb}", "a::{aa::*, ab::aba}"], + ["{a::{self, aa::*, ab::aba}, b::{ba, bb}}"] + ); + + test_merge!( + One, + ["b", "a::ac::{aca, acb}", "a::{aa::*, ab}"], + ["{a::{aa::*, ab, ac::{aca, acb}}, b}"] + ); + } + + #[test] fn test_flatten_use_trees() { assert_eq!( flatten_use_trees(parse_use_trees!["foo::{a::{b, c}, d::e}"]), diff --git a/src/reorder.rs b/src/reorder.rs index ac65ff2c108..2c58350d4fe 100644 --- a/src/reorder.rs +++ b/src/reorder.rs @@ -113,6 +113,7 @@ fn rewrite_reorderable_or_regroupable_items( merge_use_trees(normalized_items, SharedPrefix::Module) } ImportGranularity::Item => flatten_use_trees(normalized_items), + ImportGranularity::One => merge_use_trees(normalized_items, SharedPrefix::One), ImportGranularity::Preserve => normalized_items, }; diff --git a/tests/source/imports_granularity_one.rs b/tests/source/imports_granularity_one.rs new file mode 100644 index 00000000000..c21707df395 --- /dev/null +++ b/tests/source/imports_granularity_one.rs @@ -0,0 +1,60 @@ +// rustfmt-imports_granularity: One + +use b; +use a::ac::{aca, acb}; +use a::{aa::*, ab}; + +use a as x; +use b::ba; +use a::{aa, ab}; + +use a::aa::aaa; +use a::ab::aba as x; +use a::aa::*; + +use a::aa; +use a::ad::ada; +#[cfg(test)] +use a::{ab, ac::aca}; +use b; +#[cfg(test)] +use b::{ + ba, bb, + bc::bca::{bcaa, bcab}, +}; + +pub use a::aa; +pub use a::ae; +use a::{ab, ac, ad}; +use b::ba; +pub use b::{bb, bc::bca}; + +use a::aa::aaa; +use a::ac::{aca, acb}; +use a::{aa::*, ab}; +use b::{ + ba, + bb::{self, bba}, +}; + +use crate::a; +use crate::b::ba; +use c::ca; + +use super::a; +use c::ca; +use super::b::ba; + +use crate::a; +use super::b; +use c::{self, ca}; + +use a::{ + // some comment + aa::{aaa, aab}, + ab, + // another comment + ac::aca, +}; +use b as x; +use a::ad::ada; diff --git a/tests/target/imports_granularity_one.rs b/tests/target/imports_granularity_one.rs new file mode 100644 index 00000000000..78ec5e7325c --- /dev/null +++ b/tests/target/imports_granularity_one.rs @@ -0,0 +1,79 @@ +// rustfmt-imports_granularity: One + +use { + a::{ + aa::*, + ab, + ac::{aca, acb}, + }, + b, +}; + +use { + a::{self as x, aa, ab}, + b::ba, +}; + +use a::{ + aa::{aaa, *}, + ab::aba as x, +}; + +#[cfg(test)] +use a::{ab, ac::aca}; +#[cfg(test)] +use b::{ + ba, bb, + bc::bca::{bcaa, bcab}, +}; +use { + a::{aa, ad::ada}, + b, +}; + +pub use { + a::{aa, ae}, + b::{bb, bc::bca}, +}; +use { + a::{ab, ac, ad}, + b::ba, +}; + +use { + a::{ + aa::{aaa, *}, + ab, + ac::{aca, acb}, + }, + b::{ + ba, + bb::{self, bba}, + }, +}; + +use { + crate::{a, b::ba}, + c::ca, +}; + +use { + super::{a, b::ba}, + c::ca, +}; + +use { + super::b, + crate::a, + c::{self, ca}, +}; + +use { + a::{ + aa::{aaa, aab}, + ab, + ac::aca, + ad::ada, + }, + b as x, +}; |