tslint-react/rules/jsxSelfCloseRule.js

/**
 * @license
 * Copyright 2016 Palantir Technologies, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
"use strict";
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var Lint = require("tslint");
var ts = require("typescript");
var Rule = (function (_super) {
    __extends(Rule, _super);
    function Rule() {
        return _super.apply(this, arguments) || this;
    }
    Rule.prototype.apply = function (sourceFile) {
        var walker = new JsxSelfCloseWalker(sourceFile, this.getOptions());
        return this.applyWithWalker(walker);
    };
    return Rule;
}(Lint.Rules.AbstractRule));
Rule.FAILURE_STRING = "JSX elements with no children must be self-closing";
exports.Rule = Rule;
var JsxSelfCloseWalker = (function (_super) {
    __extends(JsxSelfCloseWalker, _super);
    function JsxSelfCloseWalker() {
        return _super.apply(this, arguments) || this;
    }
    JsxSelfCloseWalker.prototype.visitJsxElement = function (node) {
        var missingOpeningOrClosingTag = node.openingElement == null || node.closingElement == null;
        // The last part of the textIsEmpty assignment is to check whether the tag is completely empty or
        // only consists of spaces/new lines.
        var textIsEmpty = node.children.length === 1
            && node.children[0].kind === ts.SyntaxKind.JsxText
            && node.children[0].getText() === "";
        var noChildren = node.children.length === 0 || textIsEmpty;
        if (missingOpeningOrClosingTag || noChildren) {
            this.addFailure(this.createFailure(node.getStart(), node.getWidth(), Rule.FAILURE_STRING));
        }
        _super.prototype.visitJsxElement.call(this, node);
    };
    return JsxSelfCloseWalker;
}(Lint.RuleWalker));