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

export type TrimData = {
    type?: 'start'|'end'|'both'|'left'|'right'|'lines',
    char?: StrTerm,
}

export class Trim extends Command<TrimData> {
    attemptParse(context: ParseContext): TrimData {
        return {
            type: context.popOptionalKeywordInSet(['start', 'end', 'both', 'left', 'right', 'lines'])?.value,
            char: context.popOptionalTerm(),
        }
    }

    getDisplayName(): string {
        return 'trim'
    }

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