-
Notifications
You must be signed in to change notification settings - Fork 692
/
type-parameter.ts
85 lines (72 loc) · 1.83 KB
/
type-parameter.ts
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
import { Type } from "./abstract";
/**
* Represents a type parameter type.
*
* ~~~
* let value: T;
* ~~~
*/
export class TypeParameterType extends Type {
/**
*
*/
readonly name: string;
constraint?: Type;
/**
* Default type for the type parameter.
*
* ```
* class SomeClass<T = {}>
* ```
*/
default?: Type;
/**
* The type name identifier.
*/
readonly type: string = "typeParameter";
constructor(name: string) {
super();
this.name = name;
}
/**
* Clone this type.
*
* @return A clone of this type.
*/
clone(): Type {
const clone = new TypeParameterType(this.name);
clone.constraint = this.constraint;
clone.default = this.default;
return clone;
}
/**
* Test whether this type equals the given type.
*
* @param type The type that should be checked for equality.
* @returns TRUE if the given type equals this type, FALSE otherwise.
*/
equals(type: TypeParameterType): boolean {
if (!(type instanceof TypeParameterType)) {
return false;
}
let constraintEquals = false;
if (this.constraint && type.constraint) {
constraintEquals = type.constraint.equals(this.constraint);
} else if (!this.constraint && !type.constraint) {
constraintEquals = true;
}
let defaultEquals = false;
if (this.default && type.default) {
defaultEquals = type.default.equals(this.default);
} else if (!this.default && !type.default) {
defaultEquals = true;
}
return constraintEquals && defaultEquals;
}
/**
* Return a string representation of this type.
*/
toString(): string {
return this.name;
}
}