emmylua_ls 0.25.1

A language server for emmylua.
Documentation 
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

use std::sync::Arc;

use emmylua_code_analysis::{DbIndex, LuaFunctionType, LuaType, find_callable_overload};
use emmylua_parser::LuaCallExpr;

use crate::handlers::hover::{HoverBuilder, HoverDeclContext, HoverDeclInfo};

use super::{
    define_hover::{HoverFunctionInfo, set_function_info_to_builder},
    extract_function_member, get_function_description,
    render::process_function_type,
};

pub(super) fn build_function_call_hover(
    builder: &mut HoverBuilder,
    db: &DbIndex,
    decl_context: &HoverDeclContext,
    call_expr: &LuaCallExpr,
) -> Option<()> {
    let ordered_decls = decl_context.ordered_decl_refs();
    let call_arg_types = infer_call_arg_types(builder, call_expr);
    let mut function_infos = Vec::new();

    let matched_decls =
        find_decls_for_call(builder, db, &ordered_decls, &call_arg_types, call_expr);
    if matched_decls.is_empty() {
        for matched_decl in ordered_decls {
            if let Some(info) =
                build_unmatched_call_hover_function_info(builder, db, matched_decl, call_expr)
            {
                function_infos.push(info);
            }
        }

        return set_function_info_to_builder(builder, &mut function_infos);
    }

    for matched_decl in matched_decls {
        let info = build_call_hover_function_info(builder, db, matched_decl, call_expr);
        if let Some(info) = info {
            function_infos.push(info);
        }
    }

    set_function_info_to_builder(builder, &mut function_infos)
}

fn infer_call_arg_types(builder: &HoverBuilder, call_expr: &LuaCallExpr) -> Vec<LuaType> {
    let Some(args) = call_expr.get_args_list() else {
        return Vec::new();
    };
    let args = args.get_args().collect::<Vec<_>>();
    builder
        .semantic_model
        .infer_expr_list_types(&args, None)
        .into_iter()
        .map(|(typ, _)| typ)
        .collect()
}

fn build_unmatched_call_hover_function_info(
    builder: &mut HoverBuilder,
    db: &DbIndex,
    matched_decl: &HoverDeclInfo,
    call_expr: &LuaCallExpr,
) -> Option<HoverFunctionInfo> {
    let match_semantic_decl = matched_decl.id();
    let function_member = extract_function_member(db, match_semantic_decl);
    let contents = process_function_type(
        builder,
        db,
        matched_decl.typ(),
        match_semantic_decl,
        function_member,
        Some(call_expr),
    )?;
    if contents.is_empty() {
        return None;
    }

    let description = get_function_description(builder, db, match_semantic_decl);
    HoverFunctionInfo::from_contents(contents, description)
}

fn build_call_hover_function_info(
    builder: &mut HoverBuilder,
    db: &DbIndex,
    matched_decl: MatchedCallDecl<'_>,
    call_expr: &LuaCallExpr,
) -> Option<HoverFunctionInfo> {
    let match_semantic_decl = matched_decl.decl.id();
    let function_member = extract_function_member(db, match_semantic_decl);
    let call_type = LuaType::DocFunction(matched_decl.func);

    let contents = process_function_type(
        builder,
        db,
        &call_type,
        match_semantic_decl,
        function_member,
        Some(call_expr),
    )?;

    let description = get_function_description(builder, db, match_semantic_decl);
    HoverFunctionInfo::from_contents(contents, description)
}

struct MatchedCallDecl<'a> {
    decl: &'a HoverDeclInfo,
    func: Arc<LuaFunctionType>,
}

fn find_decls_for_call<'a>(
    builder: &HoverBuilder,
    db: &DbIndex,
    ordered_decls: &[&'a HoverDeclInfo],
    call_arg_types: &[LuaType],
    call_expr: &LuaCallExpr,
) -> Vec<MatchedCallDecl<'a>> {
    let mut matched_decls = Vec::new();

    for decl in ordered_decls.iter().copied() {
        if let Some(func) =
            find_callable_for_call(builder, db, decl.typ(), call_arg_types, call_expr)
        {
            matched_decls.push(MatchedCallDecl { decl, func });
        }
    }

    matched_decls
}

fn find_callable_for_call(
    builder: &HoverBuilder,
    db: &DbIndex,
    decl_type: &LuaType,
    call_arg_types: &[LuaType],
    call_expr: &LuaCallExpr,
) -> Option<Arc<LuaFunctionType>> {
    find_callable_overload(
        db,
        &mut builder.semantic_model.get_cache().borrow_mut(),
        decl_type,
        call_arg_types,
        call_expr,
        None,
        false,
    )
    .ok()
    .flatten()
}