lrn@google.com
e1b4afa85d
The implementation is still primitive: It calls int.parse, then double.parse, and then fails if it hasn't found a result yet. BUG= http://dartbug.com/8237 R=floitsch@google.com Committed: https://code.google.com/p/dart/source/detail?r=30624 Review URL: https://codereview.chromium.org//85633003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@30663 260f80e4-7a28-3924-810f-c04153c831b5
53 lines
1.5 KiB
Dart
53 lines
1.5 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Dart core library.
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// VM implementation of double.
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patch class double {
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static double _native_parse(_OneByteString string) native "Double_parse";
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static double _parse(var str) {
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str = str.trim();
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if (str.length == 0) return null;
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final ccid = str._cid;
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_OneByteString oneByteString;
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// TODO(floitsch): Allow _ExternalOneByteStrings. As of May 2013 they don't
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// have any _classId.
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if (ccid != _OneByteString._classId) {
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int length = str.length;
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var s = _OneByteString._allocate(length);
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for (int i = 0; i < length; i++) {
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int currentUnit = str.codeUnitAt(i);
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// All valid trimmed double strings must be ASCII.
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if (currentUnit < 128) {
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s._setAt(i, currentUnit);
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} else {
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return null;
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}
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}
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oneByteString = s;
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} else {
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oneByteString = str;
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}
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return _native_parse(oneByteString);
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}
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/* patch */ static double parse(String str,
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[double onError(String str)]) {
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var result = _parse(str);
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if (result == null) {
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if (onError == null) throw new FormatException(str);
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return onError(str);
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}
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// Parse can create a NaN that is not identical to double.NAN.
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if (result.isNaN) return NAN;
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return result;
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}
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}
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