floitsch@google.com
7c194d0d06
Review URL: https://codereview.chromium.org//12218086 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18313 260f80e4-7a28-3924-810f-c04153c831b5
45 lines
1.3 KiB
Dart
45 lines
1.3 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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patch class StringBuffer {
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List<String> _buffer;
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int _length;
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/// Creates the string buffer with an initial content.
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/* patch */ StringBuffer([Object content = ""]) {
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// TODO(floitsch): remove or rewrite this call to clear. It is currently
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// necessary because the VM doesn't allow default values for fields in
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// patch classes.
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_buffer = new List<String>();
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_length = 0;
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write(content);
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}
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/* patch */ int get length => _length;
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/// Adds [obj] to the buffer.
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/* patch */ void _write(String str) {
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_buffer.add(str);
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_length += str.length;
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}
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/// Clears the string buffer.
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/* patch */ void clear() {
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_buffer = new List<String>();
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_length = 0;
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}
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/// Returns the contents of buffer as a concatenated string.
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/* patch */ String toString() {
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if (_buffer.length == 0) return "";
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if (_buffer.length == 1) return _buffer[0];
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String result = Strings.concatAll(_buffer);
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_buffer.clear();
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_buffer.add(result);
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// Since we track the length at each add operation, there is no
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// need to update it in this function.
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return result;
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}
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}
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