104 lines
2.6 KiB
JavaScript
104 lines
2.6 KiB
JavaScript
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// Copyright 2006 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Utility for fast string concatenation.
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*/
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goog.provide('goog.string.StringBuffer');
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/**
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* Utility class to facilitate string concatenation.
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*
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* @param {*=} opt_a1 Optional first initial item to append.
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* @param {...*} var_args Other initial items to
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* append, e.g., new goog.string.StringBuffer('foo', 'bar').
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* @constructor
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*/
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goog.string.StringBuffer = function(opt_a1, var_args) {
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if (opt_a1 != null) {
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this.append.apply(this, arguments);
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}
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};
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/**
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* Internal buffer for the string to be concatenated.
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* @type {string}
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* @private
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*/
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goog.string.StringBuffer.prototype.buffer_ = '';
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/**
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* Sets the contents of the string buffer object, replacing what's currently
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* there.
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*
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* @param {*} s String to set.
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*/
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goog.string.StringBuffer.prototype.set = function(s) {
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this.buffer_ = '' + s;
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};
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/**
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* Appends one or more items to the buffer.
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*
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* Calling this with null, undefined, or empty arguments is an error.
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*
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* @param {*} a1 Required first string.
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* @param {*=} opt_a2 Optional second string.
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* @param {...?} var_args Other items to append,
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* e.g., sb.append('foo', 'bar', 'baz').
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* @return {!goog.string.StringBuffer} This same StringBuffer object.
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* @suppress {duplicate}
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*/
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goog.string.StringBuffer.prototype.append = function(a1, opt_a2, var_args) {
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// Use a1 directly to avoid arguments instantiation for single-arg case.
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this.buffer_ += String(a1);
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if (opt_a2 != null) { // second argument is undefined (null == undefined)
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for (var i = 1; i < arguments.length; i++) {
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this.buffer_ += arguments[i];
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}
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}
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return this;
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};
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/**
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* Clears the internal buffer.
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*/
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goog.string.StringBuffer.prototype.clear = function() {
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this.buffer_ = '';
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};
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/**
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* @return {number} the length of the current contents of the buffer.
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*/
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goog.string.StringBuffer.prototype.getLength = function() {
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return this.buffer_.length;
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};
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/**
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* @return {string} The concatenated string.
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* @override
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*/
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goog.string.StringBuffer.prototype.toString = function() {
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return this.buffer_;
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};
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