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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 | 4 |
5 patch class String { | 5 patch class String { |
6 /* patch */ factory String.fromCharCodes(Iterable<int> charCodes, | 6 /* patch */ factory String.fromCharCodes(Iterable<int> charCodes, |
7 [int start = 0, int end]) { | 7 [int start = 0, int end]) { |
8 return _StringBase.createFromCharCodes(charCodes, start, end); | 8 return _StringBase.createFromCharCodes(charCodes, start, end); |
9 } | 9 } |
10 | 10 |
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50 | 50 |
51 int get hashCode native "String_getHashCode"; | 51 int get hashCode native "String_getHashCode"; |
52 | 52 |
53 /** | 53 /** |
54 * Create the most efficient string representation for specified | 54 * Create the most efficient string representation for specified |
55 * [codePoints]. | 55 * [codePoints]. |
56 */ | 56 */ |
57 static String createFromCharCodes(Iterable<int> charCodes, | 57 static String createFromCharCodes(Iterable<int> charCodes, |
58 int start, int end) { | 58 int start, int end) { |
59 if (charCodes == null) throw new ArgumentError(charCodes); | 59 if (charCodes == null) throw new ArgumentError(charCodes); |
60 if (start < 0) throw new RangeError.value(start); | |
61 // TODO(srdjan): Also skip copying of wide typed arrays. | 60 // TODO(srdjan): Also skip copying of wide typed arrays. |
62 final ccid = ClassID.getID(charCodes); | 61 final ccid = ClassID.getID(charCodes); |
63 bool isOneByteString = false; | 62 bool isOneByteString = false; |
64 if ((ccid != ClassID.cidArray) && | 63 if ((ccid != ClassID.cidArray) && |
65 (ccid != ClassID.cidGrowableObjectArray) && | 64 (ccid != ClassID.cidGrowableObjectArray) && |
66 (ccid != ClassID.cidImmutableArray)) { | 65 (ccid != ClassID.cidImmutableArray)) { |
67 if ((charCodes is Uint8List) || (charCodes is Int8List)) { | 66 if ((charCodes is Uint8List) || (charCodes is Int8List)) { |
68 isOneByteString = true; | 67 isOneByteString = true; |
69 } else { | 68 } else { |
70 charCodes = new List.from(charCodes, growable: false); | 69 charCodes = new List.from(charCodes, growable: false); |
Søren Gjesse
2014/09/26 11:43:00
If the iterable is long (maybe even infinite) then
| |
71 } | 70 } |
72 } | 71 } |
73 if ((end == null) || (end > charCodes.length)) { | 72 int codeCount = charCodes.length; |
74 end = charCodes.length; | 73 if (start < 0 || start > codeCount) { |
74 throw new RangeError.range(start, 0, codeCount); | |
75 } | 75 } |
76 if (end <= start) return ""; | 76 if (end == null) { |
77 end = codeCount; | |
78 } else if (end < start || end > codeCount) { | |
79 throw new RangeError.range(end, start, codeCount); | |
80 } | |
77 final len = end - start; | 81 final len = end - start; |
78 if (!isOneByteString) { | 82 if (!isOneByteString) { |
79 for (int i = start; i < end; i++) { | 83 for (int i = start; i < end; i++) { |
80 int e = charCodes[i]; | 84 int e = charCodes[i]; |
81 if (e is! _Smi) throw new ArgumentError(e); | 85 if (e is! _Smi) throw new ArgumentError(e); |
82 // Is e Latin1? | 86 // Is e Latin1? |
83 if ((e < 0) || (e > 0xFF)) { | 87 if ((e < 0) || (e > 0xFF)) { |
84 return _createFromCodePoints(charCodes, start, end); | 88 return _createFromCodePoints(charCodes, start, end); |
85 } | 89 } |
86 } | 90 } |
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1026 class _CodeUnits extends Object with ListMixin<int>, | 1030 class _CodeUnits extends Object with ListMixin<int>, |
1027 UnmodifiableListMixin<int> { | 1031 UnmodifiableListMixin<int> { |
1028 /** The string that this is the code units of. */ | 1032 /** The string that this is the code units of. */ |
1029 String _string; | 1033 String _string; |
1030 | 1034 |
1031 _CodeUnits(this._string); | 1035 _CodeUnits(this._string); |
1032 | 1036 |
1033 int get length => _string.length; | 1037 int get length => _string.length; |
1034 int operator[](int i) => _string.codeUnitAt(i); | 1038 int operator[](int i) => _string.codeUnitAt(i); |
1035 } | 1039 } |
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