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+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/*
+  This file contains the declaration for CppVariant, a type used by C++ classes
+  that are to be bound to JavaScript objects.
+
+  CppVariant exists primarily as an interface between C++ callers and the
+  corresponding NPVariant type.  CppVariant also provides a number of
+  convenience constructors and accessors, so that the NPVariantType values
+  don't need to be exposed, and a destructor to free any memory allocated for
+  string values.
+*/
+
+#ifndef CppVariant_h
+#define CppVariant_h
+
+#include <string>
+#include <vector>
+
+#include "third_party/WebKit/public/web/WebBindings.h"
+
+namespace WebTestRunner {
+
+class CppVariant : public NPVariant {
+public:
+    CppVariant();
+    ~CppVariant();
+    void setNull();
+    void set(bool);
+    void set(int32_t);
+    void set(double);
+
+    // Note that setting a CppVariant to a string value involves copying the
+    // string data, which must be freed with a call to freeData() when the
+    // CppVariant is set to a different value or is no longer needed. Normally
+    // this is handled by the other set() methods and by the destructor.
+    void set(const char*); // Must be a null-terminated string.
+    void set(const std::string&);
+    void set(const NPString&);
+    void set(const NPVariant&);
+
+    // Note that setting a CppVariant to an NPObject involves ref-counting
+    // the actual object. freeData() should only be called if the CppVariant
+    // is no longer needed. The other set() methods handle this internally.
+    // Also, the object's NPClass is expected to be a static object: neither
+    // the NP runtime nor CppVariant will ever free it.
+    void set(NPObject*_value);
+
+    // These three methods all perform deep copies of any string data. This
+    // allows local CppVariants to be released by the destructor without
+    // corrupting their sources. In performance-critical code, or when strings
+    // are very long, avoid creating new CppVariants.
+    // In case of NPObject as the data, the copying involves ref-counting
+    // as opposed to deep-copying. The ref-counting ensures that sources don't
+    // get corrupted when the copies get destroyed.
+    void copyToNPVariant(NPVariant* result) const;
+    CppVariant& operator=(const CppVariant& original);
+    CppVariant(const CppVariant& original);
+
+    // Calls NPN_ReleaseVariantValue, which frees any string data
+    // held by the object and sets its type to null.
+    // In case of NPObject, the NPN_ReleaseVariantValue decrements
+    // the ref-count (releases when ref-count becomes 0)
+    void freeData();
+
+    // Compares this CppVariant's type and value to another's. They must be
+    // identical in both type and value to be considered equal. For string and
+    // object types, a deep comparison is performed; that is, the contents of the
+    // strings, or the classes and refcounts of the objects, must be the same,
+    // but they need not be the same pointers.
+    bool isEqual(const CppVariant&) const;
+
+    // The value of a CppVariant may be read directly from its NPVariant (but
+    // should only be set using one of the set() methods above). Although the
+    // type of a CppVariant is likewise public, it can be accessed through these
+    // functions rather than directly if a caller wishes to avoid dependence on
+    // the NPVariantType values.
+    bool isBool() const { return (type == NPVariantType_Bool); }
+    bool isInt32() const { return (type == NPVariantType_Int32); }
+    bool isDouble() const { return (type == NPVariantType_Double); }
+    bool isNumber() const { return (isInt32() || isDouble()); }
+    bool isString() const { return (type == NPVariantType_String); }
+    bool isVoid() const { return (type == NPVariantType_Void); }
+    bool isNull() const { return (type == NPVariantType_Null); }
+    bool isEmpty() const { return (isVoid() || isNull()); }
+    bool isObject() const { return (type == NPVariantType_Object); }
+
+    // Converters. The CppVariant must be of a type convertible to these values.
+    // For example, toInt32() works only if isNumber() is true.
+    std::string toString() const;
+    int32_t toInt32() const;
+    double toDouble() const;
+    bool toBoolean() const;
+    // Returns a vector of strings for the specified argument. This is useful
+    // for converting a JavaScript array of strings into a vector of strings.
+    std::vector<std::string> toStringVector() const;
+
+    // Invoke method of the given name on an object with the supplied arguments.
+    // The first argument should be the object on which the method is to be
+    // invoked. Returns whether the method was successfully invoked. If the
+    // method was invoked successfully, any return value is stored in the
+    // CppVariant specified by result.
+    bool invoke(const std::string&, const CppVariant* arguments,
+                uint32_t argumentCount, CppVariant& result) const;
+
+    // Invoke an object's default method with the supplied arguments.
+    // The first argument should be the object on which the method is to be
+    // invoked. Returns whether the method was successfully invoked. If the
+    // method was invoked successfully, any return value is stored in the
+    // CppVariant specified by result.
+    bool invokeDefault(const CppVariant* arguments,
+                       uint32_t argumentCount, CppVariant& result) const;
+};
+
+}
+
+#endif // CppVariant_h