devscout-rs 0.9.0

Fast code index for C# and TypeScript codebases -- map, find, refs, impact from the CLI.
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

use std::collections::HashMap;

use crate::graph::{FragArgType, FragRef};

use super::edges::type_probe;
use super::index::DefIndex;
use super::ladder::{resolve_ref, Resolution};
use super::scope::FileContext;

pub(super) fn materialize(
    fact: &FragArgType,
    source_file: &str,
    r: &FragRef,
    index: &DefIndex,
    contexts: &HashMap<String, FileContext>,
) -> Option<String> {
    let FragArgType::Member {
        owner,
        member,
        receiver_args,
        call,
    } = fact
    else {
        return match fact {
            FragArgType::Known(name) => Some(name.clone()),
            _ => None,
        };
    };
    let ctx = contexts.get(source_file)?;
    let ns = r.namespace.as_deref().unwrap_or_default();
    let probe = type_probe(owner, ns, &r.outer_types);
    let idx = match resolve_ref(&probe, &ctx.usings, ns, index, &ctx.aliases, contexts) {
        Resolution::Resolved(idx, _) => idx,
        Resolution::External => return bcl_member_type(owner, member, *call).map(str::to_string),
        Resolution::Ambiguous(_, _) => return None,
    };
    let lists = &index.member_lists[idx];
    let descriptor = if *call {
        if let Some(recorded) = special_type(lists.method_params.get(&format!("@result:{member}")))
        {
            recorded
        } else {
            if lists
                .method_params
                .get(member)
                .is_some_and(|overloads| overloads.len() != 1)
            {
                return None;
            }
            let mut result = lists.method_returns.get(member)?.clone();
            if let Some(args) = lists.method_return_args.get(member) {
                result.push('<');
                result.push_str(&args.join(","));
                result.push('>');
            }
            result
        }
    } else {
        if let Some(recorded) =
            special_type(lists.method_params.get(&format!("@property:{member}")))
                .or_else(|| special_type(lists.method_params.get(&format!("@field:{member}"))))
        {
            return substitute_receiver_type(
                &recorded,
                receiver_args.as_deref(),
                lists.type_params.len(),
            );
        }
        let fact = lists
            .property_types
            .get(member)
            .or_else(|| lists.field_types.get(member))?;
        let mut result = fact.type_name.clone();
        if let Some(args) = &fact.args {
            result.push('<');
            result.push_str(&args.join(","));
            result.push('>');
        }
        result
    };
    if *call
        && descriptor.contains('*')
        && lists.method_params.get(member).is_none_or(|overloads| {
            overloads.iter().any(|overload| {
                overload
                    .type_params
                    .as_ref()
                    .is_none_or(|own| own.count > 0)
            })
        })
    {
        // The descriptor uses the same wildcard for the receiver's and the
        // method's own type parameters. Only a known nongeneric method lets
        // the receiver binding replace that wildcard soundly.
        return None;
    }
    substitute_receiver_type(
        &descriptor,
        receiver_args.as_deref(),
        lists.type_params.len(),
    )
}

fn special_type(overloads: Option<&Vec<super::index::MethodOverloadParams>>) -> Option<String> {
    let overloads = overloads?;
    let first = overloads.first()?.params.first()?;
    (overloads
        .iter()
        .all(|entry| entry.params.as_slice() == [first.as_str()]))
    .then(|| first.clone())
}

pub(super) fn substitute_receiver_type(
    descriptor: &str,
    receiver_args: Option<&[String]>,
    type_params: usize,
) -> Option<String> {
    if !descriptor.contains('*') {
        return Some(descriptor.to_string());
    }
    if type_params != 1 {
        return None;
    }
    let replacement = receiver_args?.first()?;
    if replacement.contains('*') || replacement == "?" {
        return None;
    }
    Some(descriptor.replace('*', replacement))
}

fn bcl_member_type(owner: &str, member: &str, call: bool) -> Option<&'static str> {
    if owner.contains('.') && !owner.starts_with("System.") {
        return None;
    }
    match (owner.rsplit('.').next().unwrap_or(owner), member, call) {
        (
            "TimeSpan",
            "FromSeconds" | "FromMinutes" | "FromHours" | "FromDays" | "FromMilliseconds",
            true,
        ) => Some("TimeSpan"),
        ("CancellationToken", "None", false) => Some("CancellationToken"),
        ("Exception", "Message", false) => Some("string"),
        _ => None,
    }
}