Method path

basex-core/src/main/java/org/basex/query/QueryParser.java:2195–2233

Parses the "PathExpr" rule. @return query expression or null @throws QueryException query exception

()

   * @throws QueryException query exception
   */
  private Expr path() throws QueryException {
    checkInit();

    final ExprList el;
    Expr root = null;
    if(consume('/')) {
      final InputInfo ii = info();
      root = Function._UTIL_ROOT.get(ii, new ContextValue(ii));
      el = new ExprList();
      final Expr expr;
      if(consume('/')) {
        // two slashes: absolute descendant path
        checkAxis(Axis.DESCENDANT);
        add(el, new CachedStep(info(), Axis.DESCENDANT_OR_SELF, NodeTest.GNODE));
        mark();
        expr = step(true);
      } else {
        // one slash: absolute child path
        checkAxis(Axis.CHILD);
        mark();
        expr = step(false);
        // no more steps: return root expression
        if(expr == null) return root;
      }
      add(el, expr);
    } else {
      // relative path (no preceding slash)
      mark();
      final Expr expr = step(false);
      if(expr == null) return null;
      // return expression if no slash follows
      if(current() != '/' && !(expr instanceof Step)) return expr;
      el = new ExprList();
      if(expr instanceof Step) add(el, expr);
      else root = expr;
    }
    relativePath(el);
    return Path.get(info(), root, el.finish());
  }

  /**
   * Parses the "RelativePathExpr" rule.