aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_assists/src/lib.rs
blob: 13ea45ec7cc99d2f552b1b0e71091a108441c916 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
//! `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.

#[allow(unused)]
macro_rules! eprintln {
    ($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
}

mod assist_ctx;
mod marks;
#[cfg(test)]
mod tests;
pub mod utils;
pub mod ast_transform;

use hir::Semantics;
use ra_db::FileRange;
use ra_ide_db::{source_change::SourceChange, RootDatabase};
use ra_syntax::TextRange;

pub(crate) use crate::assist_ctx::{Assist, AssistCtx};

/// 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 {
    pub id: AssistId,
    /// Short description of the assist, as shown in the UI.
    pub label: String,
    pub group: Option<GroupLabel>,
    /// Target ranges are used to sort assists: the smaller the target range,
    /// the more specific assist is, and so it should be sorted first.
    pub target: TextRange,
}

#[derive(Clone, Debug)]
pub struct GroupLabel(pub String);

impl AssistLabel {
    pub(crate) fn new(
        id: AssistId,
        label: String,
        group: Option<GroupLabel>,
        target: TextRange,
    ) -> AssistLabel {
        // FIXME: make fields private, so that this invariant can't be broken
        assert!(label.starts_with(|c: char| c.is_uppercase()));
        AssistLabel { id, label, group, target }
    }
}

#[derive(Debug, Clone)]
pub struct ResolvedAssist {
    pub label: AssistLabel,
    pub source_change: SourceChange,
}

/// 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 sema = Semantics::new(db);
    let ctx = AssistCtx::new(&sema, range, false);
    handlers::all()
        .iter()
        .filter_map(|f| f(ctx.clone()))
        .flat_map(|it| it.0)
        .map(|a| a.label)
        .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 sema = Semantics::new(db);
    let ctx = AssistCtx::new(&sema, range, true);
    let mut a = handlers::all()
        .iter()
        .filter_map(|f| f(ctx.clone()))
        .flat_map(|it| it.0)
        .map(|it| it.into_resolved().unwrap())
        .collect::<Vec<_>>();
    a.sort_by_key(|it| it.label.target.len());
    a
}

mod handlers {
    use crate::{Assist, AssistCtx};

    pub(crate) type Handler = fn(AssistCtx) -> Option<Assist>;

    mod add_custom_impl;
    mod add_derive;
    mod add_explicit_type;
    mod add_function;
    mod add_impl;
    mod add_missing_impl_members;
    mod add_new;
    mod apply_demorgan;
    mod auto_import;
    mod change_visibility;
    mod early_return;
    mod fill_match_arms;
    mod flip_binexpr;
    mod flip_comma;
    mod flip_trait_bound;
    mod inline_local_variable;
    mod introduce_variable;
    mod invert_if;
    mod merge_imports;
    mod merge_match_arms;
    mod move_bounds;
    mod move_guard;
    mod raw_string;
    mod remove_dbg;
    mod remove_mut;
    mod replace_if_let_with_match;
    mod replace_let_with_if_let;
    mod replace_qualified_name_with_use;
    mod replace_unwrap_with_match;
    mod split_import;
    mod add_from_impl_for_enum;
    mod reorder_fields;
    mod unwrap_block;

    pub(crate) fn all() -> &'static [Handler] {
        &[
            // These are alphabetic for the foolish consistency
            add_custom_impl::add_custom_impl,
            add_derive::add_derive,
            add_explicit_type::add_explicit_type,
            add_from_impl_for_enum::add_from_impl_for_enum,
            add_function::add_function,
            add_impl::add_impl,
            add_new::add_new,
            apply_demorgan::apply_demorgan,
            auto_import::auto_import,
            change_visibility::change_visibility,
            early_return::convert_to_guarded_return,
            fill_match_arms::fill_match_arms,
            flip_binexpr::flip_binexpr,
            flip_comma::flip_comma,
            flip_trait_bound::flip_trait_bound,
            inline_local_variable::inline_local_variable,
            introduce_variable::introduce_variable,
            invert_if::invert_if,
            merge_imports::merge_imports,
            merge_match_arms::merge_match_arms,
            move_bounds::move_bounds_to_where_clause,
            move_guard::move_arm_cond_to_match_guard,
            move_guard::move_guard_to_arm_body,
            raw_string::add_hash,
            raw_string::make_raw_string,
            raw_string::make_usual_string,
            raw_string::remove_hash,
            remove_dbg::remove_dbg,
            remove_mut::remove_mut,
            reorder_fields::reorder_fields,
            replace_if_let_with_match::replace_if_let_with_match,
            replace_let_with_if_let::replace_let_with_if_let,
            replace_qualified_name_with_use::replace_qualified_name_with_use,
            replace_unwrap_with_match::replace_unwrap_with_match,
            split_import::split_import,
            unwrap_block::unwrap_block,
            // These are manually sorted for better priorities
            add_missing_impl_members::add_missing_impl_members,
            add_missing_impl_members::add_missing_default_members,
            // Are you sure you want to add new assist here, and not to the
            // sorted list above?
        ]
    }
}