--- /dev/null
+"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 Rule = /** @class */ (function (_super) {
+ tslib_1.__extends(Rule, _super);
+ function Rule() {
+ return _super !== null && _super.apply(this, arguments) || this;
+ }
+ /* tslint:enable:object-literal-sort-keys */
+ Rule.FAILURE_STRING = function (name) {
+ return "Qualifier is unnecessary since '" + name + "' is in scope.";
+ };
+ Rule.prototype.applyWithProgram = function (sourceFile, program) {
+ return this.applyWithFunction(sourceFile, walk, undefined, program.getTypeChecker());
+ };
+ /* tslint:disable:object-literal-sort-keys */
+ Rule.metadata = {
+ ruleName: "no-unnecessary-qualifier",
+ description: "Warns when a namespace qualifier (`A.x`) is unnecessary.",
+ hasFix: true,
+ optionsDescription: "Not configurable.",
+ options: null,
+ optionExamples: [true],
+ type: "style",
+ typescriptOnly: true,
+ requiresTypeInfo: true,
+ };
+ return Rule;
+}(Lint.Rules.TypedRule));
+exports.Rule = Rule;
+function walk(ctx, checker) {
+ var namespacesInScope = [];
+ ts.forEachChild(ctx.sourceFile, cb);
+ function cb(node) {
+ switch (node.kind) {
+ case ts.SyntaxKind.ModuleDeclaration:
+ case ts.SyntaxKind.EnumDeclaration:
+ namespacesInScope.push(node);
+ ts.forEachChild(node, cb);
+ namespacesInScope.pop();
+ break;
+ case ts.SyntaxKind.QualifiedName:
+ var _a = node, left = _a.left, right = _a.right;
+ visitNamespaceAccess(node, left, right);
+ break;
+ case ts.SyntaxKind.PropertyAccessExpression:
+ var _b = node, expression = _b.expression, name = _b.name;
+ if (utils.isEntityNameExpression(expression)) {
+ visitNamespaceAccess(node, expression, name);
+ break;
+ }
+ // falls through
+ default:
+ ts.forEachChild(node, cb);
+ }
+ }
+ function visitNamespaceAccess(node, qualifier, name) {
+ if (qualifierIsUnnecessary(qualifier, name)) {
+ var fix = Lint.Replacement.deleteFromTo(qualifier.getStart(), name.getStart());
+ ctx.addFailureAtNode(qualifier, Rule.FAILURE_STRING(qualifier.getText()), fix);
+ }
+ else {
+ // Only look for nested qualifier errors if we didn't already fail on the outer qualifier.
+ ts.forEachChild(node, cb);
+ }
+ }
+ function qualifierIsUnnecessary(qualifier, name) {
+ var namespaceSymbol = checker.getSymbolAtLocation(qualifier);
+ if (namespaceSymbol === undefined || !symbolIsNamespaceInScope(namespaceSymbol)) {
+ return false;
+ }
+ var accessedSymbol = checker.getSymbolAtLocation(name);
+ if (accessedSymbol === undefined) {
+ return false;
+ }
+ // If the symbol in scope is different, the qualifier is necessary.
+ var fromScope = getSymbolInScope(qualifier, accessedSymbol.flags, name.text);
+ return fromScope === undefined || symbolsAreEqual(accessedSymbol, fromScope);
+ }
+ function getSymbolInScope(node, flags, name) {
+ // TODO:PERF `getSymbolsInScope` gets a long list. Is there a better way?
+ var scope = checker.getSymbolsInScope(node, flags);
+ return scope.find(function (scopeSymbol) { return scopeSymbol.name === name; });
+ }
+ function symbolIsNamespaceInScope(symbol) {
+ var symbolDeclarations = symbol.getDeclarations();
+ if (symbolDeclarations === undefined) {
+ return false;
+ }
+ else if (symbolDeclarations.some(function (decl) { return namespacesInScope.some(function (ns) { return ns === decl; }); })) {
+ return true;
+ }
+ var alias = tryGetAliasedSymbol(symbol, checker);
+ return alias !== undefined && symbolIsNamespaceInScope(alias);
+ }
+ function symbolsAreEqual(accessed, inScope) {
+ if (checker.getExportSymbolOfSymbol !== undefined) {
+ inScope = checker.getExportSymbolOfSymbol(inScope);
+ return accessed === inScope;
+ }
+ return (accessed === inScope ||
+ // For compatibility with typescript@2.5: compare declarations because the symbols don't have the same reference
+ Lint.Utils.arraysAreEqual(accessed.declarations, inScope.declarations, function (a, b) { return a === b; }));
+ }
+}
+function tryGetAliasedSymbol(symbol, checker) {
+ return utils.isSymbolFlagSet(symbol, ts.SymbolFlags.Alias)
+ ? checker.getAliasedSymbol(symbol)
+ : undefined;
+}