Line data Source code
1 : // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
2 : // for details. All rights reserved. Use of this source code is governed by a
3 : // BSD-style license that can be found in the LICENSE file.
4 :
5 : /// Validates the arguments passed to [StringScanner.error].
6 : void validateErrorArgs(String string, Match match, int position, int length) {
7 : if (match != null && (position != null || length != null)) {
8 0 : throw new ArgumentError("Can't pass both match and position/length.");
9 : }
10 :
11 : if (position != null) {
12 0 : if (position < 0) {
13 0 : throw new RangeError("position must be greater than or equal to 0.");
14 0 : } else if (position > string.length) {
15 0 : throw new RangeError("position must be less than or equal to the "
16 : "string length.");
17 : }
18 : }
19 :
20 0 : if (length != null && length < 0) {
21 0 : throw new RangeError("length must be greater than or equal to 0.");
22 : }
23 :
24 0 : if (position != null && length != null && position + length > string.length) {
25 0 : throw new RangeError("position plus length must not go beyond the end of "
26 : "the string.");
27 : }
28 : }
|