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Merge #1067

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1067: Take number of arguments at the call-site into account for signature help r=matklad a=kjeremy

Fixes #1065

Co-authored-by: kjeremy <kjeremy@gmail.com>
This commit is contained in:
bors[bot] 2019-04-01 11:15:34 +00:00
commit b7e26c32a1
1 changed files with 28 additions and 6 deletions
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34
crates/ra_ide_api/src/call_info.rs
View file

@ -28,6 +28,7 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
let function = hir::source_binder::function_from_source(db, symbol.file_id, fn_def)?;
let mut call_info = CallInfo::new(db, function, fn_def)?;
// If we have a calling expression let's find which argument we are on
let num_params = call_info.parameters.len();
let has_self = fn_def.param_list().and_then(|l| l.self_param()).is_some();
@ -38,18 +39,28 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
}
} else if num_params > 1 {
// Count how many parameters into the call we are.
if let Some(ref arg_list) = calling_node.arg_list() {
if let Some(arg_list) = calling_node.arg_list() {
// Number of arguments specified at the call site
let num_args_at_callsite = arg_list.args().count();
let arg_list_range = arg_list.syntax().range();
if !arg_list_range.contains_inclusive(position.offset) {
tested_by!(call_info_bad_offset);
return None;
}
let param = arg_list
.args()
.position(|arg| arg.syntax().range().contains(position.offset))
.or(Some(num_params - 1))
.unwrap();
let mut param = std::cmp::min(
num_args_at_callsite,
arg_list
.args()
.take_while(|arg| arg.syntax().range().end() < position.offset)
.count(),
);
// If we are in a method account for `self`
if has_self {
param = param + 1;
}
call_info.active_parameter = Some(param);
}
@ -155,6 +166,17 @@ fn bar() { foo(3, <|>); }"#,
assert_eq!(info.active_parameter, Some(1));
}
#[test]
fn test_fn_signature_two_args_empty() {
let info = call_info(
r#"fn foo(x: u32, y: u32) -> u32 {x + y}
fn bar() { foo(<|>); }"#,
);
assert_eq!(info.parameters, vec!("x".to_string(), "y".to_string()));
assert_eq!(info.active_parameter, Some(0));
}
#[test]
fn test_fn_signature_for_impl() {
let info = call_info(