Implement Mirrors for the UTF8/16 view on Swift Strings

Swift SVN r19651

stdlib/core/StringUTFViewsMirrors.swift.gyb

@@ -0,0 +1,40 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+%import gyb
+%TMirrorDecl = gyb.parseTemplate("../common/MirrorDecl.gyb")
+%TMirrorConformance = gyb.parseTemplate("../common/MirrorConformance.gyb")
+%TMirrorBoilerplate = gyb.parseTemplate("../common/MirrorBoilerplate.gyb")
+
+% for Self in ['UTF8View','UTF16View']:
+%   MirrorDecl = gyb.executeTemplate(TMirrorDecl,introspecteeType=Self)
+%   MirrorConformance = gyb.executeTemplate(TMirrorConformance,introspecteeType=Self)
+%   MirrorBoilerplate = gyb.executeTemplate(TMirrorBoilerplate,introspecteeType=Self)
+
+extension String {
+  ${MirrorDecl} {
+    ${MirrorBoilerplate}
+
+      @public var count: Int { return distance(_value.startIndex,_value.endIndex) }
+
+      @public subscript(i: Int) -> (String,Mirror) { 
+        if i >= count {
+          _fatalError("Mirror access out of bounds")
+        }
+        return ("[\(i)]",reflect(self[i]))
+      }
+
+      @public var summary: String { return String(_value._core) }
+
+      @public var quickLookObject: QuickLookObject? { return .Some(.Text(summary)) }
+  }
+}