import {
  CaretParser,
  CaretNode,
  CaretLeafParselet,
  TokensTag,
} from "@caret-js/core";
import { ParenthesesToken } from "../tokens/parentheses";
import { NodeTag } from "@caret-js/core";

export class ParenthesesChildTag extends NodeTag<false> {
  public readonly allowMultiple = false;
  equals(other: this): boolean {
    return other instanceof ParenthesesChildTag;
  }
}

export class ParenthesesParselet extends CaretLeafParselet {
  parse(parser: CaretParser): CaretNode {
    const token = parser.consume();
    this.assert(token instanceof ParenthesesToken, "Expected ParenthesesToken");

    return parser
      .parseSubStrand(token.child)
      .addTag(new TokensTag([token]))
      .addTag(new ParenthesesChildTag());
  }
}