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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
4 // Dart core library. | 4 // Dart core library. |
5 | 5 |
6 // VM implementation of double. | 6 // VM implementation of double. |
7 | 7 |
8 patch class double { | 8 patch class double { |
9 static double _parse(String string) native "Double_parse"; | 9 |
| 10 static double _native_parse(_OneByteString string) native "Double_parse"; |
| 11 |
| 12 static double _parse(var str) { |
| 13 str = str.trim(); |
| 14 |
| 15 if (str.length == 0) return null; |
| 16 |
| 17 final ccid = str._cid; |
| 18 _OneByteString oneByteString; |
| 19 // TODO(floitsch): Allow _ExternalOneByteStrings. As of May 2013 they don't |
| 20 // have any _classId. |
| 21 if (ccid != _OneByteString._classId) { |
| 22 int length = str.length; |
| 23 var s = _OneByteString._allocate(length); |
| 24 for (int i = 0; i < length; i++) { |
| 25 int currentUnit = str.codeUnitAt(i); |
| 26 // All valid trimmed double strings must be ASCII. |
| 27 if (currentUnit < 128) { |
| 28 s._setAt(i, currentUnit); |
| 29 } else { |
| 30 return null; |
| 31 } |
| 32 } |
| 33 oneByteString = s; |
| 34 } else { |
| 35 oneByteString = str; |
| 36 } |
| 37 |
| 38 return _native_parse(oneByteString); |
| 39 } |
10 | 40 |
11 /* patch */ static double parse(String str, | 41 /* patch */ static double parse(String str, |
12 [double handleError(String str)]) { | 42 [double handleError(String str)]) { |
13 if (handleError == null) return _parse(str); | 43 var result = _parse(str); |
14 try { | 44 if (result == null) { |
15 return _parse(str); | 45 if (handleError == null) throw new FormatException(str); |
16 } on FormatException { | |
17 return handleError(str); | 46 return handleError(str); |
18 } | 47 } |
| 48 return result; |
19 } | 49 } |
20 } | 50 } |
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