Initial commit (from f5274cbdce4ae7c9e4b937dcdf95ac70ae436d5f)

node_modules/tslint/lib/rules/noSparseArraysRule.js

@@ -0,0 +1,100 @@
+"use strict";
+/**
+ * @license
+ * Copyright 2017 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.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+var tslib_1 = require("tslib");
+var utils = require("tsutils");
+var ts = require("typescript");
+var Lint = require("../index");
+var noSparseArrays_examples_1 = require("./code-examples/noSparseArrays.examples");
+var Rule = /** @class */ (function (_super) {
+    tslib_1.__extends(Rule, _super);
+    function Rule() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    Rule.prototype.apply = function (sourceFile) {
+        return this.applyWithFunction(sourceFile, walk);
+    };
+    /* tslint:disable:object-literal-sort-keys */
+    Rule.metadata = {
+        ruleName: "no-sparse-arrays",
+        description: "Forbids array literals to contain missing elements.",
+        rationale: "Missing elements are probably an accidentally duplicated comma.",
+        optionsDescription: "Not configurable.",
+        options: null,
+        optionExamples: [true],
+        type: "functionality",
+        typescriptOnly: false,
+        codeExamples: noSparseArrays_examples_1.codeExamples,
+    };
+    /* tslint:enable:object-literal-sort-keys */
+    Rule.FAILURE_STRING = "Array has a missing element.";
+    return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+    return ts.forEachChild(ctx.sourceFile, function cb(node) {
+        if (!utils.isArrayLiteralExpression(node)) {
+            if (utils.isBinaryExpression(node) &&
+                node.operatorToken.kind === ts.SyntaxKind.EqualsToken) {
+                // Ignore LHS of assignments.
+                traverseExpressionsInLHS(node.left, cb);
+                return cb(node.right);
+            }
+            else {
+                return ts.forEachChild(node, cb);
+            }
+        }
+        for (var _i = 0, _a = node.elements; _i < _a.length; _i++) {
+            var element = _a[_i];
+            if (utils.isOmittedExpression(element)) {
+                // Node has an empty range, so just use range starting at `element.pos`.
+                ctx.addFailureAt(element.pos, 1, Rule.FAILURE_STRING);
+            }
+            else {
+                ts.forEachChild(element, cb);
+            }
+        }
+    });
+}
+/** Traverse the LHS of an `=` expression, calling `cb` embedded default value, but ignoring binding patterns. */
+function traverseExpressionsInLHS(node, cb) {
+    switch (node.kind) {
+        case ts.SyntaxKind.ParenthesizedExpression:
+            traverseExpressionsInLHS(node.expression, cb);
+            break;
+        case ts.SyntaxKind.ArrayLiteralExpression:
+            for (var _i = 0, _a = node.elements; _i < _a.length; _i++) {
+                var e = _a[_i];
+                traverseExpressionsInLHS(e, cb);
+            }
+            break;
+        case ts.SyntaxKind.ObjectLiteralExpression:
+            for (var _b = 0, _c = node.properties; _b < _c.length; _b++) {
+                var o = _c[_b];
+                traverseExpressionsInLHS(o, cb);
+            }
+            break;
+        case ts.SyntaxKind.BinaryExpression: {
+            var _d = node, left = _d.left, operatorToken = _d.operatorToken, right = _d.right;
+            if (operatorToken.kind === ts.SyntaxKind.EqualsToken) {
+                traverseExpressionsInLHS(left, cb);
+                cb(right);
+            }
+        }
+    }
+}