apple2js/js/types.ts
Will Scullin afc5280ac2
Flesh out some state stuff (#59)
Get save and restore state limping along to nearly as well as before I refactored and broke everything.
2021-02-27 19:17:36 -08:00

100 lines
2.3 KiB
TypeScript

/**
* Extracts the members of a constant array as a type. Used as:
*
* @example
* const SOME_VALUES = ['a', 'b', 1, 2] as const;
* type SomeValues = MemberOf<typeof SOME_VALUES>; // 'a' | 'b' | 1 | 2
*/
export type MemberOf<T extends ReadonlyArray<unknown>> =
T extends ReadonlyArray<infer E> ? E : never;
/** A bit. */
export type bit = 0 | 1;
/** A nibble. */
export type nibble =
0x0 | 0x1 | 0x2 | 0x3 | 0x4 | 0x5 | 0x6 | 0x7 |
0x8 | 0x9 | 0xa | 0xb | 0xc | 0xd | 0xe | 0xf;
/** A byte (0..255). This is not enforced by the compiler. */
export type byte = number;
/** A word (0..65535). This is not enforced by the compiler. */
export type word = number;
/** A raw region of memory. */
export type memory = Uint8Array;
/** A raw region of memory. */
export type rom = ReadonlyUint8Array;
/** A mapped region of memory. */
export interface Memory {
/** Start page. */
start(): byte;
/** End page, inclusive. */
end(): byte;
/** Read a byte. */
read(page: byte, offset: byte): byte;
/** Write a byte. */
write(page: byte, offset: byte, value: byte): void;
}
/* An interface card */
export interface Card extends Memory, Restorable {
/* Reset the card */
reset(): void;
/* Draw card to canvas */
blit?(): ImageData;
/* Process period events */
tick?(): void;
/* Read or Write an I/O switch */
ioSwitch(off: byte, val?: byte): byte | undefined;
}
export const DISK_FORMATS = [
'2mg',
'd13',
'do',
'dsk',
'hdv',
'po',
'nib',
'woz'
] as const;
export type DiskFormat = MemberOf<typeof DISK_FORMATS>;
export interface Drive {
format: DiskFormat,
volume: number,
tracks: Array<byte[] | Uint8Array>,
trackMap: unknown,
}
export interface DiskIIDrive extends Drive {
rawTracks: unknown,
track: number,
head: number,
phase: number,
readOnly: boolean,
dirty: boolean,
}
export type TapeData = Array<[duration: number, high: boolean]>;
export interface Restorable<T = any> {
getState(): T;
setState(state: T): void;
}
// Read-only typed arrays for constants
export type TypedArrayMutableProperties = 'copyWithin' | 'fill' | 'reverse' | 'set' | 'sort';
export interface ReadonlyUint8Array extends Omit<Uint8Array, TypedArrayMutableProperties> {
readonly [n: number]: number
}