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

use std::borrow::Cow;

use num_bigint::BigInt;
use stc_ts_types::{IntrinsicKind, StringMapping, TplElem, TplType, Type};
use swc_atoms::Atom;
use swc_common::{Span, Spanned, TypeEq, DUMMY_SP};
use swc_ecma_ast::TsKeywordTypeKind;

use super::{relation::Relation, Analyzer};
use crate::VResult;

/// These methods are ported from `tsc`.
impl Analyzer<'_, '_> {
    /// `isTypeCloselyMatchedBy` of `tsc`.
    pub(crate) fn is_type_closely_matched_by(&mut self, source: &Type, target: &Type) -> bool {
        match (source.normalize(), target.normalize()) {
            (Type::Ref(source), Type::Ref(target)) => source.type_name.type_eq(&target.type_name),
            _ => false,
        }
    }

    /// `isTypeOrBaseIdenticalTo` of `tsc`.
    pub(crate) fn is_type_or_base_identical_to(&mut self, source: &Type, target: &Type) -> bool {
        self.is_type_identical_to(source, target)
            || (target.is_kwd(TsKeywordTypeKind::TsStringKeyword) && source.is_str_lit())
            || (target.is_kwd(TsKeywordTypeKind::TsNumberKeyword) && source.is_num_lit())
    }

    /// `isTypeIdenticalTo` of `tsc`.
    pub(crate) fn is_type_identical_to(&mut self, source: &Type, target: &Type) -> bool {
        self.is_type_related_to(source, target, Relation::Identity)
    }

    /// Ported from `isTypeAssignableTo` of `tsc`.
    pub(crate) fn is_type_assignable_to(&mut self, span: Span, source: &Type, target: &Type) -> bool {
        self.assign(span, &mut Default::default(), target, source).is_ok()
    }

    /// Ported from `isValidNumberString` of `tsc`.
    pub(crate) fn is_valid_num_str(&mut self, s: &str, round_trip_only: bool) -> bool {
        if s.is_empty() {
            return false;
        }

        let v = if s.starts_with("0x") || s.starts_with("0X") {
            usize::from_str_radix(&s[2..], 16).ok().map(|v| v as f64)
        } else if s.starts_with("0o") || s.starts_with("0O") {
            usize::from_str_radix(&s[2..], 8).ok().map(|v| v as f64)
        } else if s.starts_with("0b") || s.starts_with("0B") {
            usize::from_str_radix(&s[2..], 2).ok().map(|v| v as f64)
        } else {
            s.parse::<f64>().ok()
        };

        if let Some(v) = v {
            v.is_finite() && (!round_trip_only || v.to_string() == s)
        } else {
            false
        }
    }

    /// Ported from `isValidBigIntString` of `tsc`.
    pub(crate) fn is_valid_big_int_str(&mut self, s: &str, round_trip_only: bool) -> bool {
        if s.is_empty() {
            return false;
        }

        let v = if s.starts_with("0x") || s.starts_with("0X") {
            BigInt::parse_bytes(s[2..].as_bytes(), 16)
        } else if s.starts_with("0o") || s.starts_with("0O") {
            BigInt::parse_bytes(s[2..].as_bytes(), 8)
        } else if s.starts_with("0b") || s.starts_with("0B") {
            BigInt::parse_bytes(s[2..].as_bytes(), 2)
        } else {
            s.parse::<BigInt>().ok()
        };
        if let Some(v) = v {
            !round_trip_only || v.to_string() == s
        } else {
            false
        }
    }

    /// Ported from `isMemberOfStringMapping` of `tsc`.
    pub(crate) fn is_member_of_string_mapping(&mut self, span: Span, source: &Type, target: &Type) -> VResult<bool> {
        if target.is_any() || target.is_kwd(TsKeywordTypeKind::TsStringKeyword) {
            return Ok(true);
        }

        if target.is_tpl() {
            return Ok(self.is_type_assignable_to(span, source, target));
        }

        if let Type::StringMapping(StringMapping {
            kind: IntrinsicKind::Capitalize | IntrinsicKind::Uncapitalize | IntrinsicKind::Uppercase | IntrinsicKind::Lowercase,
            ..
        }) = target.normalize()
        {
            // TODO: Port https://github.com/microsoft/TypeScript/blob/eb5419fc8d980859b98553586dfb5f40d811a745/src/compiler/checker.ts#L22574-L22589
            return Ok(true);
        }

        Ok(false)
    }

    pub(crate) fn get_string_like_type_for_type<'a>(&mut self, ty: &'a Type) -> Cow<'a, Type> {
        if ty.is_any() || ty.is_str() || ty.is_string_mapping() || ty.is_tpl() {
            Cow::Borrowed(ty)
        } else {
            Cow::Owned(Type::Tpl(TplType {
                span: ty.span(),
                quasis: vec![
                    TplElem {
                        span: DUMMY_SP,
                        value: Atom::default(),
                    },
                    TplElem {
                        span: DUMMY_SP,
                        value: Atom::default(),
                    },
                ],
                types: vec![ty.clone()],
                metadata: Default::default(),
                tracker: Default::default(),
            }))
        }
    }
}