SQL Operations Studio Public Preview 1 (0.23) release source code

build/lib/tslint/duplicateImportsRule.ts

@@ -0,0 +1,40 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as ts from 'typescript';
+import { join, dirname } from 'path';
+import * as Lint from 'tslint';
+
+export class Rule extends Lint.Rules.AbstractRule {
+	public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
+		return this.applyWithWalker(new ImportPatterns(sourceFile, this.getOptions()));
+	}
+}
+
+class ImportPatterns extends Lint.RuleWalker {
+
+	private imports: { [path: string]: boolean; } = Object.create(null);
+
+	constructor(file: ts.SourceFile, opts: Lint.IOptions) {
+		super(file, opts);
+	}
+
+	protected visitImportDeclaration(node: ts.ImportDeclaration): void {
+		let path = node.moduleSpecifier.getText();
+
+		// remove quotes
+		path = path.slice(1, -1);
+
+		if (path[0] === '.') {
+			path = join(dirname(node.getSourceFile().fileName), path);
+		}
+
+		if (this.imports[path]) {
+			this.addFailure(this.createFailure(node.getStart(), node.getWidth(), `Duplicate imports for '${path}'.`));
+		}
+
+		this.imports[path] = true;
+	}
+}