str/src/vm/commands/lines.ts

import {Command, ParseContext, unwrapString} from "./command.js";
import {LexInput} from "../lexer.js";
import {StrVM} from "../vm.js";
import {Awaitable} from "../../util/types.js";

export class Lines extends Command<{}> {
    attemptParse(context: ParseContext): {} {
        return {}
    }

    getDisplayName(): string {
        return 'lines'
    }

    isParseCandidate(token: LexInput): boolean {
        return this.isKeyword(token, 'lines')
    }

    execute(vm: StrVM): Awaitable<StrVM> {
        return vm.replaceContextMatchingTerm({
            destructure: sub => {
                return sub.split('\n')
                    .map((line, idx) => ({
                        prefix: idx ? '\n' : undefined,
                        value: line,
                    }))
            },
        })
    }
}