apple2js/test/util/memory.ts

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import { MemoryPages, byte, word } from 'js/types';
import { assertByte } from './asserts';
export type Log = [address: word, value: byte, types: 'read'|'write']
export class TestMemory implements MemoryPages {
private data: Buffer;
private logging: boolean = false;
private log: Log[] = [];
constructor(private size: number) {
this.data = Buffer.alloc(size << 8);
}
start() {
return 0;
}
end() {
return this.size - 1;
}
read(page: byte, off: byte) {
assertByte(page);
assertByte(off);
const val = this.data[(page << 8) | off];
if (this.logging) {
this.log.push([page << 8 | off, val, 'read']);
}
return val;
}
write(page: byte, off: byte, val: byte) {
assertByte(page);
assertByte(off);
assertByte(val);
if (this.logging) {
this.log.push([page << 8 | off, val, 'write']);
}
this.data[(page << 8) | off] = val;
}
reset() {
this.log = [];
}
logStart() {
this.log = [];
this.logging = true;
}
logStop() {
this.logging = false;
}
getLog() {
return this.log;
}
}