import { Sym } from '../scannerparser/Sym.js';
import { Identifier } from './Identifier.js';
import { Literal } from './Literal.js';
import { Expression } from './Expression.js';
export declare enum FactorType {
    Identifier = 0,
    Literal = 1,
    Group = 2,
    Repetition = 3,
    Optionally = 4
}
/**
 * A factor is a single symbol or a group of symbols defined as:
 *
 * ```plaintext
 * FACTOR = IDENTIFIER
 *        | LITERAL
 *        | "(" EXPRESSION ")"
 *        | "{" EXPRESSION "}
 *        | "[" EXPRESSION "]" .
 * ```
 */
export declare class Factor extends Sym {
    readonly type: FactorType;
    readonly value: Identifier | Literal | Expression;
    constructor(type: FactorType, value: Identifier | Literal | Expression, id?: number);
    toString(): string;
}