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

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

    getDisplayName(): string {
        return 'words'
    }

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

    execute(vm: StrVM): Awaitable<StrVM> {
        return vm.tapInPlace(ctx =>
            ctx.replaceSubject(sub => {
                const val = unwrapString(sub)
                const separators = [...val.matchAll(/\s+/sg)]
                const parts = val.split(/\s+/sg)

                return wrapDestructured(
                    parts.map((part, idx) => ({
                        prefix: idx ? separators[idx - 1][0] : undefined,
                        value: part,
                    })))
            }))
    }
}