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|
use crate::completion::{
CompletionContext, CompletionItem, CompletionItemKind, CompletionKind, Completions,
};
use ra_syntax::{ast::{self, edit}, AstNode, SyntaxKind, TextRange};
use hir::{self, Docs, HasSource};
use ra_assists::utils::get_missing_impl_items;
pub(crate) fn complete_trait_impl(acc: &mut Completions, ctx: &CompletionContext) {
// it is possible to have a parent `fn` and `impl` block. Ignore completion
// attempts from within a `fn` block.
if ctx.function_syntax.is_some() {
return;
}
if let Some(ref impl_block) = ctx.impl_block {
for item in get_missing_impl_items(ctx.db, &ctx.analyzer, impl_block) {
match item {
hir::AssocItem::Function(f) => add_function_impl(acc, ctx, &f),
hir::AssocItem::TypeAlias(t) => add_type_alias_impl(acc, ctx, &t),
hir::AssocItem::Const(c) => add_const_impl(acc, ctx, &c),
}
}
}
}
fn add_function_impl(acc: &mut Completions, ctx: &CompletionContext, func: &hir::Function) {
use crate::display::FunctionSignature;
let display = FunctionSignature::from_hir(ctx.db, func.clone());
let func_name = func.name(ctx.db);
let label = if func.params(ctx.db).len() > 0 {
format!("fn {}(..)", func_name.to_string())
} else {
format!("fn {}()", func_name.to_string())
};
let builder = CompletionItem::new(CompletionKind::Magic, ctx.source_range(), label.clone())
.lookup_by(label)
.set_documentation(func.docs(ctx.db));
let completion_kind = if func.has_self_param(ctx.db) {
CompletionItemKind::Method
} else {
CompletionItemKind::Function
};
let snippet = {
let mut s = format!("{}", display);
s.push_str(" {}");
s
};
builder.insert_text(snippet).kind(completion_kind).add_to(acc);
}
fn add_type_alias_impl(
acc: &mut Completions,
ctx: &CompletionContext,
type_alias: &hir::TypeAlias,
) {
let snippet = format!("type {} = ", type_alias.name(ctx.db).to_string());
CompletionItem::new(CompletionKind::Magic, ctx.source_range(), snippet.clone())
.insert_text(snippet)
.kind(CompletionItemKind::TypeAlias)
.set_documentation(type_alias.docs(ctx.db))
.add_to(acc);
}
fn add_const_impl(
acc: &mut Completions,
ctx: &CompletionContext,
const_: &hir::Const,
) {
let snippet = make_const_compl_syntax(&const_.source(ctx.db).value);
CompletionItem::new(CompletionKind::Magic, ctx.source_range(), snippet.clone())
.insert_text(snippet)
.kind(CompletionItemKind::Const)
.set_documentation(const_.docs(ctx.db))
.add_to(acc);
}
fn make_const_compl_syntax(const_: &ast::ConstDef) -> String {
let const_ = edit::strip_attrs_and_docs(const_);
let const_start = const_.syntax().text_range().start();
let const_end = const_.syntax().text_range().end();
let start = const_
.syntax()
.first_child_or_token()
.map_or(
const_start,
|f| f.text_range().start());
let end = const_
.syntax()
.children_with_tokens()
.find(|s| s.kind() == SyntaxKind::SEMI || s.kind() == SyntaxKind::EQ)
.map_or(const_end, |f| f.text_range().start());
let len = end - start;
let range = TextRange::from_to(0.into(), len);
let syntax = const_.syntax().text().slice(range).to_string();
format!("{} = ", syntax.trim_end())
}
#[cfg(test)]
mod tests {
use crate::completion::{do_completion, CompletionItem, CompletionKind};
use insta::assert_debug_snapshot;
fn complete(code: &str) -> Vec<CompletionItem> {
do_completion(code, CompletionKind::Magic)
}
#[test]
fn single_function() {
let completions = complete(
r"
trait Test {
fn foo();
}
struct T1;
impl Test for T1 {
<|>
}
",
);
assert_debug_snapshot!(completions, @r###"
[
CompletionItem {
label: "fn foo()",
source_range: [138; 138),
delete: [138; 138),
insert: "fn foo() {}",
kind: Function,
},
]
"###);
}
#[test]
fn hide_implemented_fn() {
let completions = complete(
r"
trait Test {
fn foo();
fn bar();
}
struct T1;
impl Test for T1 {
fn foo() {}
<|>
}
",
);
assert_debug_snapshot!(completions, @r###"
[
CompletionItem {
label: "fn bar()",
source_range: [193; 193),
delete: [193; 193),
insert: "fn bar() {}",
kind: Function,
},
]
"###);
}
#[test]
fn generic_fn() {
let completions = complete(
r"
trait Test {
fn foo<T>();
}
struct T1;
impl Test for T1 {
<|>
}
",
);
assert_debug_snapshot!(completions, @r###"
[
CompletionItem {
label: "fn foo()",
source_range: [141; 141),
delete: [141; 141),
insert: "fn foo<T>() {}",
kind: Function,
},
]
"###);
}
#[test]
fn generic_constrait_fn() {
let completions = complete(
r"
trait Test {
fn foo<T>() where T: Into<String>;
}
struct T1;
impl Test for T1 {
<|>
}
",
);
assert_debug_snapshot!(completions, @r###"
[
CompletionItem {
label: "fn foo()",
source_range: [163; 163),
delete: [163; 163),
insert: "fn foo<T>()\nwhere T: Into<String> {}",
kind: Function,
},
]
"###);
}
}
|
