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|
//! `ra_assists` crate provides a bunch of code assists, also known as code
//! actions (in LSP) or intentions (in IntelliJ).
//!
//! An assist is a micro-refactoring, which is automatically activated in
//! certain context. For example, if the cursor is over `,`, a "swap `,`" assist
//! becomes available.
mod assist_ctx;
mod marks;
#[cfg(test)]
mod doc_tests;
mod utils;
pub mod ast_transform;
use std::cmp::Ordering;
use either::Either;
use ra_db::FileRange;
use ra_ide_db::RootDatabase;
use ra_syntax::{TextRange, TextUnit};
use ra_text_edit::TextEdit;
pub(crate) use crate::assist_ctx::{Assist, AssistCtx, AssistHandler};
pub use crate::handlers::replace_qualified_name_with_use::insert_use_statement;
/// Unique identifier of the assist, should not be shown to the user
/// directly.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct AssistId(pub &'static str);
#[derive(Debug, Clone)]
pub struct AssistLabel {
/// Short description of the assist, as shown in the UI.
pub label: String,
pub id: AssistId,
}
impl AssistLabel {
pub(crate) fn new(label: String, id: AssistId) -> AssistLabel {
// FIXME: make fields private, so that this invariant can't be broken
assert!(label.chars().nth(0).unwrap().is_uppercase());
AssistLabel { label: label.into(), id }
}
}
#[derive(Debug, Clone)]
pub struct AssistAction {
pub label: Option<String>,
pub edit: TextEdit,
pub cursor_position: Option<TextUnit>,
// FIXME: This belongs to `AssistLabel`
pub target: Option<TextRange>,
}
#[derive(Debug, Clone)]
pub struct ResolvedAssist {
pub label: AssistLabel,
pub action_data: Either<AssistAction, Vec<AssistAction>>,
}
impl ResolvedAssist {
pub fn get_first_action(&self) -> AssistAction {
match &self.action_data {
Either::Left(action) => action.clone(),
Either::Right(actions) => actions[0].clone(),
}
}
}
/// Return all the assists applicable at the given position.
///
/// Assists are returned in the "unresolved" state, that is only labels are
/// returned, without actual edits.
pub fn unresolved_assists(db: &RootDatabase, range: FileRange) -> Vec<AssistLabel> {
let ctx = AssistCtx::new(db, range, false);
handlers::all()
.iter()
.filter_map(|f| f(ctx.clone()))
.map(|a| match a {
Assist::Unresolved { label } => label,
Assist::Resolved { .. } => unreachable!(),
})
.collect()
}
/// Return all the assists applicable at the given position.
///
/// Assists are returned in the "resolved" state, that is with edit fully
/// computed.
pub fn resolved_assists(db: &RootDatabase, range: FileRange) -> Vec<ResolvedAssist> {
let ctx = AssistCtx::new(db, range, true);
let mut a = handlers::all()
.iter()
.filter_map(|f| f(ctx.clone()))
.map(|a| match a {
Assist::Resolved { assist } => assist,
Assist::Unresolved { .. } => unreachable!(),
})
.collect::<Vec<_>>();
sort_assists(&mut a);
a
}
fn sort_assists(assists: &mut [ResolvedAssist]) {
assists.sort_by(|a, b| match (a.get_first_action().target, b.get_first_action().target) {
(Some(a), Some(b)) => a.len().cmp(&b.len()),
(Some(_), None) => Ordering::Less,
(None, Some(_)) => Ordering::Greater,
(None, None) => Ordering::Equal,
});
}
mod handlers {
use crate::AssistHandler;
mod add_derive;
mod add_explicit_type;
mod add_impl;
mod add_custom_impl;
mod add_new;
mod apply_demorgan;
mod auto_import;
mod invert_if;
mod flip_comma;
mod flip_binexpr;
mod flip_trait_bound;
mod change_visibility;
mod fill_match_arms;
mod merge_match_arms;
mod introduce_variable;
mod inline_local_variable;
mod raw_string;
mod replace_if_let_with_match;
mod split_import;
mod remove_dbg;
pub(crate) mod replace_qualified_name_with_use;
mod add_missing_impl_members;
mod move_guard;
mod move_bounds;
mod early_return;
pub(crate) fn all() -> &'static [AssistHandler] {
&[
add_derive::add_derive,
add_explicit_type::add_explicit_type,
add_impl::add_impl,
add_custom_impl::add_custom_impl,
add_new::add_new,
apply_demorgan::apply_demorgan,
invert_if::invert_if,
change_visibility::change_visibility,
fill_match_arms::fill_match_arms,
merge_match_arms::merge_match_arms,
flip_comma::flip_comma,
flip_binexpr::flip_binexpr,
flip_trait_bound::flip_trait_bound,
introduce_variable::introduce_variable,
replace_if_let_with_match::replace_if_let_with_match,
split_import::split_import,
remove_dbg::remove_dbg,
replace_qualified_name_with_use::replace_qualified_name_with_use,
add_missing_impl_members::add_missing_impl_members,
add_missing_impl_members::add_missing_default_members,
inline_local_variable::inline_local_variable,
move_guard::move_guard_to_arm_body,
move_guard::move_arm_cond_to_match_guard,
move_bounds::move_bounds_to_where_clause,
raw_string::add_hash,
raw_string::make_raw_string,
raw_string::make_usual_string,
raw_string::remove_hash,
early_return::convert_to_guarded_return,
auto_import::auto_import,
]
}
}
#[cfg(test)]
mod helpers {
use std::sync::Arc;
use ra_db::{fixture::WithFixture, FileId, FileRange, SourceDatabaseExt};
use ra_ide_db::{symbol_index::SymbolsDatabase, RootDatabase};
use ra_syntax::TextRange;
use test_utils::{add_cursor, assert_eq_text, extract_offset, extract_range};
use crate::{Assist, AssistCtx, AssistHandler};
pub(crate) fn with_single_file(text: &str) -> (RootDatabase, FileId) {
let (mut db, file_id) = RootDatabase::with_single_file(text);
// FIXME: ideally, this should be done by the above `RootDatabase::with_single_file`,
// but it looks like this might need specialization? :(
let local_roots = vec![db.file_source_root(file_id)];
db.set_local_roots(Arc::new(local_roots));
(db, file_id)
}
pub(crate) fn check_assist(assist: AssistHandler, before: &str, after: &str) {
let (before_cursor_pos, before) = extract_offset(before);
let (db, file_id) = with_single_file(&before);
let frange =
FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
let assist =
assist(AssistCtx::new(&db, frange, true)).expect("code action is not applicable");
let action = match assist {
Assist::Unresolved { .. } => unreachable!(),
Assist::Resolved { assist } => assist.get_first_action(),
};
let actual = action.edit.apply(&before);
let actual_cursor_pos = match action.cursor_position {
None => action
.edit
.apply_to_offset(before_cursor_pos)
.expect("cursor position is affected by the edit"),
Some(off) => off,
};
let actual = add_cursor(&actual, actual_cursor_pos);
assert_eq_text!(after, &actual);
}
pub(crate) fn check_assist_range(assist: AssistHandler, before: &str, after: &str) {
let (range, before) = extract_range(before);
let (db, file_id) = with_single_file(&before);
let frange = FileRange { file_id, range };
let assist =
assist(AssistCtx::new(&db, frange, true)).expect("code action is not applicable");
let action = match assist {
Assist::Unresolved { .. } => unreachable!(),
Assist::Resolved { assist } => assist.get_first_action(),
};
let mut actual = action.edit.apply(&before);
if let Some(pos) = action.cursor_position {
actual = add_cursor(&actual, pos);
}
assert_eq_text!(after, &actual);
}
pub(crate) fn check_assist_target(assist: AssistHandler, before: &str, target: &str) {
let (before_cursor_pos, before) = extract_offset(before);
let (db, file_id) = with_single_file(&before);
let frange =
FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
let assist =
assist(AssistCtx::new(&db, frange, true)).expect("code action is not applicable");
let action = match assist {
Assist::Unresolved { .. } => unreachable!(),
Assist::Resolved { assist } => assist.get_first_action(),
};
let range = action.target.expect("expected target on action");
assert_eq_text!(&before[range.start().to_usize()..range.end().to_usize()], target);
}
pub(crate) fn check_assist_range_target(assist: AssistHandler, before: &str, target: &str) {
let (range, before) = extract_range(before);
let (db, file_id) = with_single_file(&before);
let frange = FileRange { file_id, range };
let assist =
assist(AssistCtx::new(&db, frange, true)).expect("code action is not applicable");
let action = match assist {
Assist::Unresolved { .. } => unreachable!(),
Assist::Resolved { assist } => assist.get_first_action(),
};
let range = action.target.expect("expected target on action");
assert_eq_text!(&before[range.start().to_usize()..range.end().to_usize()], target);
}
pub(crate) fn check_assist_not_applicable(assist: AssistHandler, before: &str) {
let (before_cursor_pos, before) = extract_offset(before);
let (db, file_id) = with_single_file(&before);
let frange =
FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
let assist = assist(AssistCtx::new(&db, frange, true));
assert!(assist.is_none());
}
pub(crate) fn check_assist_range_not_applicable(assist: AssistHandler, before: &str) {
let (range, before) = extract_range(before);
let (db, file_id) = with_single_file(&before);
let frange = FileRange { file_id, range };
let assist = assist(AssistCtx::new(&db, frange, true));
assert!(assist.is_none());
}
}
#[cfg(test)]
mod tests {
use ra_db::FileRange;
use ra_syntax::TextRange;
use test_utils::{extract_offset, extract_range};
use crate::{helpers, resolved_assists};
#[test]
fn assist_order_field_struct() {
let before = "struct Foo { <|>bar: u32 }";
let (before_cursor_pos, before) = extract_offset(before);
let (db, file_id) = helpers::with_single_file(&before);
let frange =
FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
let assists = resolved_assists(&db, frange);
let mut assists = assists.iter();
assert_eq!(
assists.next().expect("expected assist").label.label,
"Change visibility to pub(crate)"
);
assert_eq!(assists.next().expect("expected assist").label.label, "Add `#[derive]`");
}
#[test]
fn assist_order_if_expr() {
let before = "
pub fn test_some_range(a: int) -> bool {
if let 2..6 = <|>5<|> {
true
} else {
false
}
}";
let (range, before) = extract_range(before);
let (db, file_id) = helpers::with_single_file(&before);
let frange = FileRange { file_id, range };
let assists = resolved_assists(&db, frange);
let mut assists = assists.iter();
assert_eq!(assists.next().expect("expected assist").label.label, "Extract into variable");
assert_eq!(assists.next().expect("expected assist").label.label, "Replace with match");
}
}
|