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-rw-r--r--crates/ra_assists/src/handlers/split_import.rs52
1 files changed, 33 insertions, 19 deletions
diff --git a/crates/ra_assists/src/handlers/split_import.rs b/crates/ra_assists/src/handlers/split_import.rs
index 2c3f07a79..292c39f59 100644
--- a/crates/ra_assists/src/handlers/split_import.rs
+++ b/crates/ra_assists/src/handlers/split_import.rs
@@ -1,6 +1,9 @@
1use std::iter::successors; 1use std::iter::{once, successors};
2 2
3use ra_syntax::{ast, AstNode, TextUnit, T}; 3use ra_syntax::{
4 ast::{self, make},
5 AstNode, T,
6};
4 7
5use crate::{Assist, AssistCtx, AssistId}; 8use crate::{Assist, AssistCtx, AssistId};
6 9
@@ -17,39 +20,50 @@ use crate::{Assist, AssistCtx, AssistId};
17// ``` 20// ```
18pub(crate) fn split_import(ctx: AssistCtx) -> Option<Assist> { 21pub(crate) fn split_import(ctx: AssistCtx) -> Option<Assist> {
19 let colon_colon = ctx.find_token_at_offset(T![::])?; 22 let colon_colon = ctx.find_token_at_offset(T![::])?;
20 let path = ast::Path::cast(colon_colon.parent())?; 23 let path = ast::Path::cast(colon_colon.parent())?.qualifier()?;
21 let top_path = successors(Some(path), |it| it.parent_path()).last()?; 24 let top_path = successors(Some(path.clone()), |it| it.parent_path()).last()?;
22 25
23 let use_tree = top_path.syntax().ancestors().find_map(ast::UseTree::cast); 26 let use_tree = top_path.syntax().ancestors().find_map(ast::UseTree::cast)?;
24 if use_tree.is_none() {
25 return None;
26 }
27 27
28 let l_curly = colon_colon.text_range().end(); 28 let new_tree = split_use_tree_prefix(&use_tree, &path)?;
29 let r_curly = match top_path.syntax().parent().and_then(ast::UseTree::cast) { 29 let cursor = ctx.frange.range.start();
30 Some(tree) => tree.syntax().text_range().end(),
31 None => top_path.syntax().text_range().end(),
32 };
33 30
34 ctx.add_assist(AssistId("split_import"), "Split import", |edit| { 31 ctx.add_assist(AssistId("split_import"), "Split import", |edit| {
35 edit.target(colon_colon.text_range()); 32 edit.target(colon_colon.text_range());
36 edit.insert(l_curly, "{"); 33 edit.replace_ast(use_tree, new_tree);
37 edit.insert(r_curly, "}"); 34 edit.set_cursor(cursor);
38 edit.set_cursor(l_curly + TextUnit::of_str("{"));
39 }) 35 })
40} 36}
41 37
38fn split_use_tree_prefix(use_tree: &ast::UseTree, prefix: &ast::Path) -> Option<ast::UseTree> {
39 let suffix = split_path_prefix(&prefix)?;
40 let use_tree = make::use_tree(suffix.clone(), use_tree.use_tree_list(), use_tree.alias());
41 let nested = make::use_tree_list(once(use_tree));
42 let res = make::use_tree(prefix.clone(), Some(nested), None);
43 Some(res)
44}
45
46fn split_path_prefix(prefix: &ast::Path) -> Option<ast::Path> {
47 let parent = prefix.parent_path()?;
48 let mut res = make::path_unqualified(parent.segment()?);
49 for p in successors(parent.parent_path(), |it| it.parent_path()) {
50 res = make::path_qualified(res, p.segment()?);
51 }
52 Some(res)
53}
54
42#[cfg(test)] 55#[cfg(test)]
43mod tests { 56mod tests {
44 use super::*;
45 use crate::helpers::{check_assist, check_assist_target}; 57 use crate::helpers::{check_assist, check_assist_target};
46 58
59 use super::*;
60
47 #[test] 61 #[test]
48 fn test_split_import() { 62 fn test_split_import() {
49 check_assist( 63 check_assist(
50 split_import, 64 split_import,
51 "use crate::<|>db::RootDatabase;", 65 "use crate::<|>db::RootDatabase;",
52 "use crate::{<|>db::RootDatabase};", 66 "use crate::<|>{db::RootDatabase};",
53 ) 67 )
54 } 68 }
55 69
@@ -58,7 +72,7 @@ mod tests {
58 check_assist( 72 check_assist(
59 split_import, 73 split_import,
60 "use crate:<|>:db::{RootDatabase, FileSymbol}", 74 "use crate:<|>:db::{RootDatabase, FileSymbol}",
61 "use crate::{<|>db::{RootDatabase, FileSymbol}}", 75 "use crate:<|>:{db::{RootDatabase, FileSymbol}}",
62 ) 76 )
63 } 77 }
64 78