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44 lines
1.3 KiB
TypeScript
44 lines
1.3 KiB
TypeScript
/* Copyright 2023 Will Scullin <scullin@scullinsteel.com>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*/
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export type byte = number;
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export type word = number;
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export type address = word;
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export type memory = Uint8Array | byte[];
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export interface Memory {
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/** Read a byte. */
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read(page: byte, offset: byte): byte;
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/** Write a byte. */
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write(page: byte, offset: byte, value: byte): void;
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}
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/** A mapped region of memory. */
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export interface MemoryPages extends Memory {
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/** Start page. */
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start(): byte;
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/** End page, inclusive. */
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end(): byte;
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}
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/**
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* Extracts the members of a constant array as a type. Used as:
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*
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* @example
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* const SOME_VALUES = ['a', 'b', 1, 2] as const;
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* type SomeValues = MemberOf<typeof SOME_VALUES>; // 'a' | 'b' | 1 | 2
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*/
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export type MemberOf<T extends ReadonlyArray<unknown>> =
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T extends ReadonlyArray<infer E> ? E : never;
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