public void testToString() {
    assertToStringWorks(CharMatcher.anyOf(""), "CharMatcher.none()");
    assertToStringWorks(CharMatcher.anyOf("1"), "CharMatcher.is('\\u0031')");
    assertToStringWorks(CharMatcher.isNot('1'), "CharMatcher.isNot('\\u0031')");
    assertToStringWorks(CharMatcher.anyOf("12"), "CharMatcher.anyOf(\"\\u0031\\u0032\")");
    assertToStringWorks(CharMatcher.anyOf("321"), "CharMatcher.anyOf(\"\\u0031\\u0032\\u0033\")");

      return "CharMatcher.is('" + showCharacter(match) + "')";
    }
  }

  /** Implementation of {@link #isNot(char)}. */
  private static final class IsNot extends FastMatcher {

    private final char match;

    IsNot(char match) {
      this.match = match;
    }

    @Override
    public boolean matches(char c) {
      return c != match;
    }

    @Override

      return "CharMatcher.is('" + showCharacter(match) + "')";
    }
  }

  /** Implementation of {@link #isNot(char)}. */
  private static final class IsNot extends FastMatcher {

    private final char match;

    IsNot(char match) {
      this.match = match;
    }

    @Override
    public boolean matches(char c) {
      return c != match;
    }

    @Override

// numbers and booleans.

// Supported comparison operators
const (
	opLt    = "<"
	opLte   = "<="
	opGt    = ">"
	opGte   = ">="
	opEq    = "="
	opIneq  = "!="
	opIs    = "IS"
	opIsNot = "ISNOT"
)

// InferBytesType will attempt to infer the data type of bytes.
// Will fail if value type is not bytes or it would result in invalid utf8.
// ORDER: int, float, bool, JSON (object or array), timestamp, string

  /** Matcher for type, subtype and attributes. */
  private static final CharMatcher TOKEN_MATCHER =
      ascii()
          .and(javaIsoControl().negate())
          .and(CharMatcher.isNot(' '))
          .and(CharMatcher.noneOf("()<>@,;:\\\"/[]?="));

  private static final CharMatcher QUOTED_TEXT_MATCHER = ascii().and(CharMatcher.noneOf("\"\\\r"));

  /*

            if (searchLog != null) {
                final String userAgent = searchLog.getUserAgent();
                final boolean isBot =
                        userAgent != null && stream(botNames).get(stream -> stream.anyMatch(botName -> userAgent.indexOf(botName) >= 0));
                if (!isBot) {
                    searchLog.getUserInfo().ifPresent(userInfo -> {
                        final String code = userInfo.getId();

    }

    fun setPathSegment(
      index: Int,
      pathSegment: String,
    ) = apply {
      val canonicalPathSegment = pathSegment.canonicalize(encodeSet = PATH_SEGMENT_ENCODE_SET)
      require(!isDot(canonicalPathSegment) && !isDotDot(canonicalPathSegment)) {
        "unexpected path segment: $pathSegment"
      }
      encodedPathSegments[index] = canonicalPathSegment
    }

    fun setEncodedPathSegment(