import { CaretInfixParselet, CharToken, TokensTag } from "@caret-js/core";
import { CaretNode, CaretParser } from "@caret-js/core";
import { SubtractNode } from "../nodes/subtract";

export class SubtractParselet extends CaretInfixParselet {
  public readonly associativity = "left";

  parse(parser: CaretParser, left: CaretNode): SubtractNode {
    const token = parser.consume();
    this.assert(
      token instanceof CharToken && token.char === "-",
      "Expected '-' token"
    );

    const right = parser.parseMinBP(this);
    return SubtractNode.from(left, right).addTag(new TokensTag([token]));
  }
}