import { ANTLRErrorListener, Recognizer, RecognitionException, Token } from "antlr4ts";

export interface SyntaxIssue {
  line: number;
  column: number;
  message: string;
  offendingSymbol?: string;
  ruleStack?: string[];
}

export class CertusErrorListener implements ANTLRErrorListener<Token> {
  public errors: SyntaxIssue[] = [];

  syntaxError<T extends Token>(
    recognizer: Recognizer<T, any>,
    offendingSymbol: any,
    line: number,
    charPositionInLine: number,
    msg: string,
    e: RecognitionException | undefined
  ): void {
    const ruleStack = (recognizer as any).ruleInvocationStack?.slice()?.reverse();
    this.errors.push({
      line,
      column: charPositionInLine,
      message: msg,
      offendingSymbol: offendingSymbol?.text,
      ruleStack,
    });
  }
}