Index: pkg/string_scanner/lib/src/utils.dart |
diff --git a/pkg/string_scanner/lib/src/utils.dart b/pkg/string_scanner/lib/src/utils.dart |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f01332eeeeaf1fcacec68361b2c016c4051c36e0 |
--- /dev/null |
+++ b/pkg/string_scanner/lib/src/utils.dart |
@@ -0,0 +1,25 @@ |
+// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
+// for details. All rights reserved. Use of this source code is governed by a |
+// BSD-style license that can be found in the LICENSE file. |
+ |
+library string_scanner.utils; |
+ |
+/// Validates the arguments passed to [StringScanner.error]. |
+void validateErrorArgs(String string, Match match, int position, int length) { |
+ if (match != null && (position != null || length != null)) { |
+ throw new ArgumentError("Can't pass both match and position/length."); |
+ } |
+ |
+ if (position != null) { |
+ if (position < 0) { |
+ throw new RangeError("position must be greater than or equal to 0."); |
+ } else if (position > string.length) { |
+ throw new RangeError("position must be less than or equal to the " |
+ "string length."); |
+ } |
+ } |
+ |
+ if (length != null && length < 0) { |
+ throw new RangeError("length must be greater than or equal to 0."); |
+ } |
Bob Nystrom
2014/05/28 21:28:57
Check for position + length going past the end?
nweiz
2014/05/28 23:56:34
Done.
|
+} |