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Side by Side Diff: sdk/lib/core/string_buffer.dart

Issue 11361190: a === b -> identical(a, b) (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Address comments. Created 8 years, 1 month ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2011, 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 /** 5 /**
6 * The StringBuffer class is useful for concatenating strings 6 * The StringBuffer class is useful for concatenating strings
7 * efficiently. Only on a call to [toString] are the strings 7 * efficiently. Only on a call to [toString] are the strings
8 * concatenated to a single String. 8 * concatenated to a single String.
9 */ 9 */
10 abstract class StringBuffer { 10 abstract class StringBuffer {
(...skipping 50 matching lines...) Expand 10 before | Expand all | Expand 10 after
61 } 61 }
62 62
63 /** 63 /**
64 * Returns the length of the buffer. 64 * Returns the length of the buffer.
65 */ 65 */
66 int get length { 66 int get length {
67 return _length; 67 return _length;
68 } 68 }
69 69
70 bool get isEmpty { 70 bool get isEmpty {
71 return _length === 0; 71 return _length == 0;
72 } 72 }
73 73
74 /** 74 /**
75 * Adds [obj] to the buffer. Returns [this]. 75 * Adds [obj] to the buffer. Returns [this].
76 */ 76 */
77 StringBuffer add(Object obj) { 77 StringBuffer add(Object obj) {
78 String str = obj.toString(); 78 String str = obj.toString();
79 if (str === null || str.isEmpty) { 79 if (str == null || str.isEmpty) {
80 return this; 80 return this;
81 } 81 }
82 _buffer.add(str); 82 _buffer.add(str);
83 _length += str.length; 83 _length += str.length;
84 return this; 84 return this;
85 } 85 }
86 86
87 /** 87 /**
88 * Adds all items in [objects] to the buffer. Returns [this]. 88 * Adds all items in [objects] to the buffer. Returns [this].
89 */ 89 */
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108 StringBuffer clear() { 108 StringBuffer clear() {
109 _buffer = new List<String>(); 109 _buffer = new List<String>();
110 _length = 0; 110 _length = 0;
111 return this; 111 return this;
112 } 112 }
113 113
114 /** 114 /**
115 * Returns the contents of buffer as a concatenated string. 115 * Returns the contents of buffer as a concatenated string.
116 */ 116 */
117 String toString() { 117 String toString() {
118 if (_buffer.length === 0) return ""; 118 if (_buffer.length == 0) return "";
119 if (_buffer.length === 1) return _buffer[0]; 119 if (_buffer.length == 1) return _buffer[0];
120 String result = Strings.concatAll(_buffer); 120 String result = Strings.concatAll(_buffer);
121 _buffer.clear(); 121 _buffer.clear();
122 _buffer.add(result); 122 _buffer.add(result);
123 // Since we track the length at each add operation, there is no 123 // Since we track the length at each add operation, there is no
124 // need to update it in this function. 124 // need to update it in this function.
125 return result; 125 return result;
126 } 126 }
127 127
128 List<String> _buffer; 128 List<String> _buffer;
129 int _length; 129 int _length;
130 } 130 }
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