96 lines
No EOL
2.8 KiB
JavaScript
96 lines
No EOL
2.8 KiB
JavaScript
/**
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* This code represents the Attribute Pool Object of the original Etherpad.
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* 90% of the code is still like in the original Etherpad
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* Look at https://github.com/ether/pad/blob/master/infrastructure/ace/www/easysync2.js
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* You can find a explanation what a attribute pool is here:
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* https://github.com/ether/etherpad-lite/blob/master/doc/easysync/easysync-notes.txt
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*/
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/*
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* Copyright 2009 Google Inc., 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
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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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/*
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An AttributePool maintains a mapping from [key,value] Pairs called
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Attributes to Numbers (unsigened integers) and vice versa. These numbers are
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used to reference Attributes in Changesets.
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*/
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var AttributePool = function () {
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this.numToAttrib = {}; // e.g. {0: ['foo','bar']}
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this.attribToNum = {}; // e.g. {'foo,bar': 0}
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this.nextNum = 0;
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};
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AttributePool.prototype.putAttrib = function (attrib, dontAddIfAbsent) {
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var str = String(attrib);
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if (str in this.attribToNum) {
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return this.attribToNum[str];
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}
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if (dontAddIfAbsent) {
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return -1;
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}
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var num = this.nextNum++;
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this.attribToNum[str] = num;
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this.numToAttrib[num] = [String(attrib[0] || ''), String(attrib[1] || '')];
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return num;
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};
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AttributePool.prototype.getAttrib = function (num) {
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var pair = this.numToAttrib[num];
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if (!pair) {
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return pair;
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}
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return [pair[0], pair[1]]; // return a mutable copy
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};
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AttributePool.prototype.getAttribKey = function (num) {
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var pair = this.numToAttrib[num];
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if (!pair) return '';
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return pair[0];
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};
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AttributePool.prototype.getAttribValue = function (num) {
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var pair = this.numToAttrib[num];
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if (!pair) return '';
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return pair[1];
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};
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AttributePool.prototype.eachAttrib = function (func) {
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for (var n in this.numToAttrib) {
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var pair = this.numToAttrib[n];
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func(pair[0], pair[1]);
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}
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};
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AttributePool.prototype.toJsonable = function () {
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return {
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numToAttrib: this.numToAttrib,
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nextNum: this.nextNum
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};
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};
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AttributePool.prototype.fromJsonable = function (obj) {
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this.numToAttrib = obj.numToAttrib;
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this.nextNum = obj.nextNum;
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this.attribToNum = {};
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for (var n in this.numToAttrib) {
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this.attribToNum[String(this.numToAttrib[n])] = Number(n);
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}
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return this;
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};
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module.exports = AttributePool; |