Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/ide/src/hover/render.rs')
| -rw-r--r-- | crates/ide/src/hover/render.rs | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/crates/ide/src/hover/render.rs b/crates/ide/src/hover/render.rs index d109c07691..fb00a40f96 100644 --- a/crates/ide/src/hover/render.rs +++ b/crates/ide/src/hover/render.rs @@ -14,7 +14,9 @@ use ide_db::{ use itertools::Itertools; use stdx::format_to; use syntax::{ - algo, ast, match_ast, AstNode, Direction, + algo, + ast::{self, RecordPat}, + match_ast, AstNode, Direction, SyntaxKind::{LET_EXPR, LET_STMT}, SyntaxToken, T, }; @@ -250,6 +252,50 @@ pub(super) fn keyword( Some(HoverResult { markup, actions }) } +/// Returns missing types in a record pattern. +/// Only makes sense when there's a rest pattern in the record pattern. +/// i.e. `let S {a, ..} = S {a: 1, b: 2}` +pub(super) fn struct_rest_pat( + sema: &Semantics<'_, RootDatabase>, + config: &HoverConfig, + pattern: &RecordPat, +) -> HoverResult { + let missing_fields = sema.record_pattern_missing_fields(pattern); + + // if there are no missing fields, the end result is a hover that shows ".." + // should be left in to indicate that there are no more fields in the pattern + // example, S {a: 1, b: 2, ..} when struct S {a: u32, b: u32} + + let mut res = HoverResult::default(); + let mut targets: Vec<hir::ModuleDef> = Vec::new(); + let mut push_new_def = |item: hir::ModuleDef| { + if !targets.contains(&item) { + targets.push(item); + } + }; + for (_, t) in &missing_fields { + walk_and_push_ty(sema.db, &t, &mut push_new_def); + } + + res.markup = { + let mut s = String::from(".., "); + for (f, _) in &missing_fields { + s += f.display(sema.db).to_string().as_ref(); + s += ", "; + } + // get rid of trailing comma + s.truncate(s.len() - 2); + + if config.markdown() { + Markup::fenced_block(&s) + } else { + s.into() + } + }; + res.actions.push(HoverAction::goto_type_from_targets(sema.db, targets)); + res +} + pub(super) fn try_for_lint(attr: &ast::Attr, token: &SyntaxToken) -> Option<HoverResult> { let (path, tt) = attr.as_simple_call()?; if !tt.syntax().text_range().contains(token.text_range().start()) { |