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101 lines
3.9 KiB
JavaScript
101 lines
3.9 KiB
JavaScript
"use strict";
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/**
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* @license
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* Copyright 2017 Palantir Technologies, Inc.
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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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Object.defineProperty(exports, "__esModule", { value: true });
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var tslib_1 = require("tslib");
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var utils = require("tsutils");
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var ts = require("typescript");
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var Lint = require("../index");
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var noSparseArrays_examples_1 = require("./code-examples/noSparseArrays.examples");
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var Rule = /** @class */ (function (_super) {
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tslib_1.__extends(Rule, _super);
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function Rule() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Rule.prototype.apply = function (sourceFile) {
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return this.applyWithFunction(sourceFile, walk);
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};
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/* tslint:disable:object-literal-sort-keys */
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Rule.metadata = {
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ruleName: "no-sparse-arrays",
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description: "Forbids array literals to contain missing elements.",
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rationale: "Missing elements are probably an accidentally duplicated comma.",
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optionsDescription: "Not configurable.",
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options: null,
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optionExamples: [true],
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type: "functionality",
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typescriptOnly: false,
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codeExamples: noSparseArrays_examples_1.codeExamples,
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};
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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = "Array has a missing element.";
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return Rule;
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}(Lint.Rules.AbstractRule));
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exports.Rule = Rule;
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function walk(ctx) {
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return ts.forEachChild(ctx.sourceFile, function cb(node) {
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if (!utils.isArrayLiteralExpression(node)) {
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if (utils.isBinaryExpression(node) &&
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node.operatorToken.kind === ts.SyntaxKind.EqualsToken) {
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// Ignore LHS of assignments.
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traverseExpressionsInLHS(node.left, cb);
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return cb(node.right);
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}
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else {
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return ts.forEachChild(node, cb);
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}
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}
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for (var _i = 0, _a = node.elements; _i < _a.length; _i++) {
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var element = _a[_i];
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if (utils.isOmittedExpression(element)) {
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// Node has an empty range, so just use range starting at `element.pos`.
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ctx.addFailureAt(element.pos, 1, Rule.FAILURE_STRING);
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}
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else {
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ts.forEachChild(element, cb);
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}
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}
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});
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}
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/** Traverse the LHS of an `=` expression, calling `cb` embedded default value, but ignoring binding patterns. */
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function traverseExpressionsInLHS(node, cb) {
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switch (node.kind) {
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case ts.SyntaxKind.ParenthesizedExpression:
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traverseExpressionsInLHS(node.expression, cb);
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break;
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case ts.SyntaxKind.ArrayLiteralExpression:
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for (var _i = 0, _a = node.elements; _i < _a.length; _i++) {
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var e = _a[_i];
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traverseExpressionsInLHS(e, cb);
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}
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break;
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case ts.SyntaxKind.ObjectLiteralExpression:
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for (var _b = 0, _c = node.properties; _b < _c.length; _b++) {
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var o = _c[_b];
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traverseExpressionsInLHS(o, cb);
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}
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break;
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case ts.SyntaxKind.BinaryExpression: {
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var _d = node, left = _d.left, operatorToken = _d.operatorToken, right = _d.right;
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if (operatorToken.kind === ts.SyntaxKind.EqualsToken) {
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traverseExpressionsInLHS(left, cb);
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cb(right);
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}
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}
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}
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}
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