@theia/filesystem
Version:
Theia - FileSystem Extension
78 lines • 3.02 kB
JavaScript
;
// *****************************************************************************
// Copyright (C) 2018 TypeFox and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************
Object.defineProperty(exports, "__esModule", { value: true });
exports.FileChangeCollection = void 0;
/**
* A file change collection guarantees that only one change is reported for each URI.
*
* Changes are normalized according following rules:
* - ADDED + ADDED => ADDED
* - ADDED + UPDATED => ADDED
* - ADDED + DELETED => [ADDED, DELETED]
* - UPDATED + ADDED => UPDATED
* - UPDATED + UPDATED => UPDATED
* - UPDATED + DELETED => DELETED
* - DELETED + ADDED => UPDATED
* - DELETED + UPDATED => UPDATED
* - DELETED + DELETED => DELETED
*/
class FileChangeCollection {
constructor() {
this.changes = new Map();
}
push(change) {
const changes = this.changes.get(change.uri) || [];
this.normalize(changes, change);
this.changes.set(change.uri, changes);
}
normalize(changes, change) {
let currentType;
let nextType = change.type;
do {
const current = changes.pop();
currentType = current && current.type;
nextType = this.reduce(currentType, nextType);
} while (!Array.isArray(nextType) && currentType !== undefined && currentType !== nextType);
const uri = change.uri;
if (Array.isArray(nextType)) {
changes.push(...nextType.map(type => ({ uri, type })));
}
else {
changes.push({ uri, type: nextType });
}
}
reduce(current, change) {
if (current === undefined) {
return change;
}
if (current === 1 /* FileChangeType.ADDED */) {
if (change === 2 /* FileChangeType.DELETED */) {
return [1 /* FileChangeType.ADDED */, 2 /* FileChangeType.DELETED */];
}
return 1 /* FileChangeType.ADDED */;
}
if (change === 2 /* FileChangeType.DELETED */) {
return 2 /* FileChangeType.DELETED */;
}
return 0 /* FileChangeType.UPDATED */;
}
values() {
return Array.from(this.changes.values()).reduce((acc, val) => acc.concat(val), []);
}
}
exports.FileChangeCollection = FileChangeCollection;
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