Swift: Test taint sources for NSString.

swift/ql/test/library-tests/dataflow/flowsources/nsstring.swift

@@ -0,0 +1,44 @@
+
+// --- stubs ---
+
+struct URL {
+	init?(string: String) {}
+}
+
+class NSObject {
+}
+
+class NSString : NSObject {
+  init(string aString: String) {}
+
+  convenience init?(contentsOfFile path: String) { self.init(string: "") }
+  convenience init(contentsOfFile path: String, encoding enc: UInt) throws { self.init(string: "") }
+  convenience init(contentsOfFile path: String, usedEncoding enc: UnsafeMutablePointer<UInt>?) throws { self.init(string: "") }
+  convenience init?(contentsOf url: URL) { self.init(string: "") }
+  convenience init(contentsOf url: URL, encoding enc: UInt) throws { self.init(string: "") }
+  convenience init(contentsOf url: URL, usedEncoding enc: UnsafeMutablePointer<UInt>?) throws { self.init(string: "") }
+
+  class func string(withContentsOfFile path: String) -> Any? { return nil }
+  class func string(withContentsOf url: URL) -> Any? { return nil }
+}
+
+// --- tests ---
+
+func testNSStrings() {
+	do
+	{
+		let path = "file.txt"
+		let string1 = try NSString(contentsOfFile: path) // SOURCE
+		let string2 = try NSString(contentsOfFile: path, encoding: 0) // SOURCE
+		let string3 = try NSString(contentsOfFile: path, usedEncoding: nil) // SOURCE
+		let string4 = NSString.string(withContentsOfFile: path) // SOURCE
+
+		let url = URL(string: "http://example.com/")!
+		let string5 = try NSString(contentsOf: url) // SOURCE
+		let string6 = try NSString(contentsOf: url, encoding: 0) // SOURCE
+		let string7 = try NSString(contentsOf: url, usedEncoding: nil) // SOURCE
+		let string8 = NSString.string(withContentsOf: url) // SOURCE
+	} catch {
+		// ...
+	}
+}