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Support hover through macro

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This commit is contained in:
kjeremy 2019-11-18 11:58:42 -05:00
parent 7614439033
commit b2cc593381
1 changed files with 66 additions and 42 deletions
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108
crates/ra_ide_api/src/hover.rs
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@ -1,11 +1,11 @@
//! FIXME: write short doc here
use hir::{Adt, HasSource, HirDisplay, Source};
use hir::{db::AstDatabase, Adt, HasSource, HirDisplay};
use ra_db::SourceDatabase;
use ra_syntax::{
algo::{ancestors_at_offset, find_covering_element, find_node_at_offset},
algo::find_covering_element,
ast::{self, DocCommentsOwner},
AstNode,
match_ast, AstNode,
};
use crate::{
@ -14,6 +14,7 @@ use crate::{
description_from_symbol, docs_from_symbol, macro_label, rust_code_markup,
rust_code_markup_with_doc, ShortLabel,
},
expand::descend_into_macros,
references::{classify_name, classify_name_ref, NameKind, NameKind::*},
FilePosition, FileRange, RangeInfo,
};
@ -162,55 +163,56 @@ fn hover_text_from_name_kind(
}
pub(crate) fn hover(db: &RootDatabase, position: FilePosition) -> Option<RangeInfo<HoverResult>> {
let parse = db.parse(position.file_id);
let file = parse.tree();
let file = db.parse_or_expand(position.file_id.into())?;
let token = file.token_at_offset(position.offset).filter(|it| !it.kind().is_trivia()).next()?;
let token = descend_into_macros(db, position.file_id, token);
let mut res = HoverResult::new();
let mut range = if let Some(name_ref) =
find_node_at_offset::<ast::NameRef>(file.syntax(), position.offset)
{
let mut no_fallback = false;
if let Some(name_kind) =
classify_name_ref(db, Source::new(position.file_id.into(), &name_ref)).map(|d| d.kind)
{
res.extend(hover_text_from_name_kind(db, name_kind, &mut no_fallback))
}
let mut range = match_ast! {
match (token.ast.parent()) {
ast::NameRef(name_ref) => {
let mut no_fallback = false;
if let Some(name_kind) =
classify_name_ref(db, token.with_ast(&name_ref)).map(|d| d.kind)
{
res.extend(hover_text_from_name_kind(db, name_kind, &mut no_fallback))
}
if res.is_empty() && !no_fallback {
// Fallback index based approach:
let symbols = crate::symbol_index::index_resolve(db, &name_ref);
for sym in symbols {
let docs = docs_from_symbol(db, &sym);
let desc = description_from_symbol(db, &sym);
res.extend(hover_text(docs, desc));
}
}
if res.is_empty() && !no_fallback {
// Fallback index based approach:
let symbols = crate::symbol_index::index_resolve(db, &name_ref);
for sym in symbols {
let docs = docs_from_symbol(db, &sym);
let desc = description_from_symbol(db, &sym);
res.extend(hover_text(docs, desc));
}
}
if !res.is_empty() {
Some(name_ref.syntax().text_range())
} else {
None
}
} else if let Some(name) = find_node_at_offset::<ast::Name>(file.syntax(), position.offset) {
if let Some(name_kind) =
classify_name(db, Source::new(position.file_id.into(), &name)).map(|d| d.kind)
{
let mut _b: bool = true;
res.extend(hover_text_from_name_kind(db, name_kind, &mut _b));
}
if !res.is_empty() {
Some(name_ref.syntax().text_range())
} else {
None
}
},
ast::Name(name) => {
if let Some(name_kind) = classify_name(db, token.with_ast(&name)).map(|d| d.kind) {
let mut _b: bool = true;
res.extend(hover_text_from_name_kind(db, name_kind, &mut _b));
}
if !res.is_empty() {
Some(name.syntax().text_range())
} else {
None
if !res.is_empty() {
Some(name.syntax().text_range())
} else {
None
}
},
_ => None,
}
} else {
None
};
if range.is_none() {
let node = ancestors_at_offset(file.syntax(), position.offset).find(|n| {
let node = token.ast.ancestors().find(|n| {
ast::Expr::cast(n.clone()).is_some() || ast::Pat::cast(n.clone()).is_some()
})?;
let frange = FileRange { file_id: position.file_id, range: node.text_range() };
@ -716,4 +718,26 @@ fn func(foo: i32) { if true { <|>foo; }; }
assert_eq!(trim_markup_opt(hover.info.first()), Some("i32"));
assert_eq!(hover.info.is_exact(), true);
}
#[test]
fn test_hover_through_macro() {
let (analysis, position) = single_file_with_position(
"
macro_rules! id {
($($tt:$tt)*) => { $($tt)* }
}
fn foo() {}
id! {
fn bar() {
foo<|>();
}
}
",
);
let hover = analysis.hover(position).unwrap().unwrap();
assert_eq!(trim_markup_opt(hover.info.first()), Some("fn foo()"));
assert_eq!(hover.info.is_exact(), true);
}
}