318 lines
11 KiB
Rust
318 lines
11 KiB
Rust
//! `ra_assists` crate provides a bunch of code assists, also known as code
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//! actions (in LSP) or intentions (in IntelliJ).
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//!
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//! An assist is a micro-refactoring, which is automatically activated in
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//! certain context. For example, if the cursor is over `,`, a "swap `,`" assist
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//! becomes available.
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mod assist_ctx;
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mod marks;
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#[cfg(test)]
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mod doc_tests;
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#[cfg(test)]
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mod test_db;
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use hir::db::HirDatabase;
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use ra_db::FileRange;
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use ra_syntax::{TextRange, TextUnit};
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use ra_text_edit::TextEdit;
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pub(crate) use crate::assist_ctx::{Assist, AssistCtx};
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pub use crate::assists::add_import::auto_import_text_edit;
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/// Unique identifier of the assist, should not be shown to the user
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/// directly.
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub struct AssistId(pub &'static str);
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#[derive(Debug, Clone)]
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pub struct AssistLabel {
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/// Short description of the assist, as shown in the UI.
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pub label: String,
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pub id: AssistId,
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}
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#[derive(Debug, Clone)]
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pub struct AssistAction {
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pub edit: TextEdit,
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pub cursor_position: Option<TextUnit>,
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pub target: Option<TextRange>,
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}
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/// Return all the assists applicable at the given position.
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///
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/// Assists are returned in the "unresolved" state, that is only labels are
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/// returned, without actual edits.
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pub fn applicable_assists<H>(db: &H, range: FileRange) -> Vec<AssistLabel>
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where
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H: HirDatabase + 'static,
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{
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AssistCtx::with_ctx(db, range, false, |ctx| {
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assists::all()
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.iter()
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.filter_map(|f| f(ctx.clone()))
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.map(|a| match a {
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Assist::Unresolved { label } => label,
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Assist::Resolved { .. } => unreachable!(),
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})
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.collect()
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})
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}
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/// Return all the assists applicable at the given position.
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///
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/// Assists are returned in the "resolved" state, that is with edit fully
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/// computed.
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pub fn assists<H>(db: &H, range: FileRange) -> Vec<(AssistLabel, AssistAction)>
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where
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H: HirDatabase + 'static,
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{
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use std::cmp::Ordering;
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AssistCtx::with_ctx(db, range, true, |ctx| {
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let mut a = assists::all()
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.iter()
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.filter_map(|f| f(ctx.clone()))
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.map(|a| match a {
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Assist::Resolved { label, action } => (label, action),
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Assist::Unresolved { .. } => unreachable!(),
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})
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.collect::<Vec<_>>();
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a.sort_by(|a, b| match (a.1.target, b.1.target) {
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(Some(a), Some(b)) => a.len().cmp(&b.len()),
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(Some(_), None) => Ordering::Less,
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(None, Some(_)) => Ordering::Greater,
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(None, None) => Ordering::Equal,
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});
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a
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})
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}
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mod assists {
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use crate::{Assist, AssistCtx};
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use hir::db::HirDatabase;
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mod add_derive;
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mod add_explicit_type;
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mod add_impl;
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mod add_custom_impl;
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mod add_new;
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mod apply_demorgan;
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mod invert_if;
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mod flip_comma;
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mod flip_binexpr;
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mod flip_trait_bound;
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mod change_visibility;
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mod fill_match_arms;
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mod merge_match_arms;
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mod introduce_variable;
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mod inline_local_variable;
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mod raw_string;
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mod replace_if_let_with_match;
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mod split_import;
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mod remove_dbg;
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pub(crate) mod add_import;
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mod add_missing_impl_members;
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mod move_guard;
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mod move_bounds;
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mod early_return;
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pub(crate) fn all<DB: HirDatabase>() -> &'static [fn(AssistCtx<DB>) -> Option<Assist>] {
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&[
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add_derive::add_derive,
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add_explicit_type::add_explicit_type,
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add_impl::add_impl,
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add_custom_impl::add_custom_impl,
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add_new::add_new,
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apply_demorgan::apply_demorgan,
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invert_if::invert_if,
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change_visibility::change_visibility,
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fill_match_arms::fill_match_arms,
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merge_match_arms::merge_match_arms,
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flip_comma::flip_comma,
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flip_binexpr::flip_binexpr,
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flip_trait_bound::flip_trait_bound,
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introduce_variable::introduce_variable,
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replace_if_let_with_match::replace_if_let_with_match,
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split_import::split_import,
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remove_dbg::remove_dbg,
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add_import::add_import,
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add_missing_impl_members::add_missing_impl_members,
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add_missing_impl_members::add_missing_default_members,
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inline_local_variable::inline_local_varialbe,
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move_guard::move_guard_to_arm_body,
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move_guard::move_arm_cond_to_match_guard,
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move_bounds::move_bounds_to_where_clause,
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raw_string::add_hash,
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raw_string::make_raw_string,
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raw_string::make_usual_string,
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raw_string::remove_hash,
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early_return::convert_to_guarded_return,
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]
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}
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}
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#[cfg(test)]
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mod helpers {
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use ra_db::{fixture::WithFixture, FileRange};
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use ra_syntax::TextRange;
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use test_utils::{add_cursor, assert_eq_text, extract_offset, extract_range};
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use crate::{test_db::TestDB, Assist, AssistCtx};
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pub(crate) fn check_assist(
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assist: fn(AssistCtx<TestDB>) -> Option<Assist>,
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before: &str,
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after: &str,
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) {
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let (before_cursor_pos, before) = extract_offset(before);
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let (db, file_id) = TestDB::with_single_file(&before);
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let frange =
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FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
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let assist =
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AssistCtx::with_ctx(&db, frange, true, assist).expect("code action is not applicable");
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let action = match assist {
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Assist::Unresolved { .. } => unreachable!(),
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Assist::Resolved { action, .. } => action,
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};
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let actual = action.edit.apply(&before);
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let actual_cursor_pos = match action.cursor_position {
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None => action
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.edit
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.apply_to_offset(before_cursor_pos)
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.expect("cursor position is affected by the edit"),
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Some(off) => off,
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};
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let actual = add_cursor(&actual, actual_cursor_pos);
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assert_eq_text!(after, &actual);
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}
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pub(crate) fn check_assist_range(
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assist: fn(AssistCtx<TestDB>) -> Option<Assist>,
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before: &str,
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after: &str,
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) {
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let (range, before) = extract_range(before);
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let (db, file_id) = TestDB::with_single_file(&before);
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let frange = FileRange { file_id, range };
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let assist =
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AssistCtx::with_ctx(&db, frange, true, assist).expect("code action is not applicable");
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let action = match assist {
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Assist::Unresolved { .. } => unreachable!(),
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Assist::Resolved { action, .. } => action,
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};
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let mut actual = action.edit.apply(&before);
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if let Some(pos) = action.cursor_position {
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actual = add_cursor(&actual, pos);
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}
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assert_eq_text!(after, &actual);
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}
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pub(crate) fn check_assist_target(
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assist: fn(AssistCtx<TestDB>) -> Option<Assist>,
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before: &str,
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target: &str,
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) {
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let (before_cursor_pos, before) = extract_offset(before);
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let (db, file_id) = TestDB::with_single_file(&before);
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let frange =
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FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
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let assist =
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AssistCtx::with_ctx(&db, frange, true, assist).expect("code action is not applicable");
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let action = match assist {
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Assist::Unresolved { .. } => unreachable!(),
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Assist::Resolved { action, .. } => action,
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};
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let range = action.target.expect("expected target on action");
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assert_eq_text!(&before[range.start().to_usize()..range.end().to_usize()], target);
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}
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pub(crate) fn check_assist_range_target(
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assist: fn(AssistCtx<TestDB>) -> Option<Assist>,
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before: &str,
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target: &str,
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) {
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let (range, before) = extract_range(before);
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let (db, file_id) = TestDB::with_single_file(&before);
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let frange = FileRange { file_id, range };
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let assist =
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AssistCtx::with_ctx(&db, frange, true, assist).expect("code action is not applicable");
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let action = match assist {
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Assist::Unresolved { .. } => unreachable!(),
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Assist::Resolved { action, .. } => action,
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};
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let range = action.target.expect("expected target on action");
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assert_eq_text!(&before[range.start().to_usize()..range.end().to_usize()], target);
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}
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pub(crate) fn check_assist_not_applicable(
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assist: fn(AssistCtx<TestDB>) -> Option<Assist>,
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before: &str,
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) {
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let (before_cursor_pos, before) = extract_offset(before);
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let (db, file_id) = TestDB::with_single_file(&before);
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let frange =
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FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
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let assist = AssistCtx::with_ctx(&db, frange, true, assist);
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assert!(assist.is_none());
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}
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pub(crate) fn check_assist_range_not_applicable(
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assist: fn(AssistCtx<TestDB>) -> Option<Assist>,
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before: &str,
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) {
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let (range, before) = extract_range(before);
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let (db, file_id) = TestDB::with_single_file(&before);
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let frange = FileRange { file_id, range };
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let assist = AssistCtx::with_ctx(&db, frange, true, assist);
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assert!(assist.is_none());
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}
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}
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#[cfg(test)]
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mod tests {
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use ra_db::{fixture::WithFixture, FileRange};
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use ra_syntax::TextRange;
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use test_utils::{extract_offset, extract_range};
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use crate::test_db::TestDB;
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#[test]
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fn assist_order_field_struct() {
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let before = "struct Foo { <|>bar: u32 }";
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let (before_cursor_pos, before) = extract_offset(before);
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let (db, file_id) = TestDB::with_single_file(&before);
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let frange =
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FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
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let assists = super::assists(&db, frange);
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let mut assists = assists.iter();
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assert_eq!(assists.next().expect("expected assist").0.label, "make pub(crate)");
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assert_eq!(assists.next().expect("expected assist").0.label, "add `#[derive]`");
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}
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#[test]
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fn assist_order_if_expr() {
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let before = "
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pub fn test_some_range(a: int) -> bool {
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if let 2..6 = <|>5<|> {
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true
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} else {
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false
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}
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}";
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let (range, before) = extract_range(before);
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let (db, file_id) = TestDB::with_single_file(&before);
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let frange = FileRange { file_id, range };
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let assists = super::assists(&db, frange);
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let mut assists = assists.iter();
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assert_eq!(assists.next().expect("expected assist").0.label, "introduce variable");
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assert_eq!(assists.next().expect("expected assist").0.label, "replace with match");
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}
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}
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