import {
  CaretLeafParselet,
  CaretParser,
  CharToken,
  TokensTag,
} from "@caret-js/core";
import { VariableNode } from "../nodes/variable";

export class VariableParselet extends CaretLeafParselet {
  parse(parser: CaretParser): VariableNode {
    const token = parser.consume();
    this.assert(
      token instanceof CharToken &&
        ((token.char >= "a" && token.char <= "z") ||
          (token.char >= "A" && token.char <= "Z")),
      "Expected CharToken for variable"
    );

    return VariableNode.from(token.char).addTag(new TokensTag([token]));
  }
}