str/src/vm/output.ts

import {StrRVal} from "./commands/command.js";
import {Awaitable} from "../util/types.js";

export const getSubjectDisplay = (sub: StrRVal): string => {
    if ( sub.term === 'string' ) {
        return sub.value
    }

    if ( sub.term === 'int' ) {
        return String(sub.term)
    }

    return JSON.stringify(sub.value, null, '\t')  // fixme
}

export type Display = {
    showSubject(sub: StrRVal): Awaitable<unknown>
}

export class ConsoleDisplay implements Display {
    showSubject(sub: StrRVal) {
        console.log(`\n---------------\n${getSubjectDisplay(sub)}\n---------------\n`)
    }
}

export class NullDisplay implements Display {
    showSubject() {}
}

export type Clipboard = {
    read(): Awaitable<string>
    overwrite(sub: string): Awaitable<unknown>
}

export class FakeClipboard {
    private val = ''

    read() {
        return this.val
    }

    overwrite(sub: string) {
        this.val = sub
    }
}

export type OutputManager = {
    display: Display,
    clipboard: Clipboard,
}