import {Command, ParseContext, StrTerm} from "./command.js";
import {LexInput} from "../lexer.js";
import {StrVM} from "../vm.js";

export type TimesData = {
    val: StrTerm,
}

export class Times extends Command<TimesData> {
    async attemptParse(context: ParseContext): Promise<TimesData> {
        return {
            val: await context.popTerm(),
        }
    }

    getDisplayName(): string {
        return 'times'
    }

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

    async execute(vm: StrVM, data: TimesData): Promise<StrVM> {
        return vm.replaceContextMatchingTerm(ctx => ({
            int: sub => sub * ctx.resolveInt(data.val),
        }))
    }
}