contrib-json_spirit:  adding library to reduce external dependencies

moreover, the current macports version is not usable due to a missing
header

Change-Id: I7cd80ecf17b1ca50e5c71badba56d0bf3d390f4f
diff --git a/contrib/json_spirit/json_spirit_reader.h b/contrib/json_spirit/json_spirit_reader.h
new file mode 100644
index 0000000..e8caa8f
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_reader.h
@@ -0,0 +1,62 @@
+#ifndef JSON_SPIRIT_READER

+#define JSON_SPIRIT_READER

+

+//          Copyright John W. Wilkinson 2007 - 2011

+// Distributed under the MIT License, see accompanying file LICENSE.txt

+

+// json spirit version 4.05

+

+#if defined(_MSC_VER) && (_MSC_VER >= 1020)

+# pragma once

+#endif

+

+#include "json_spirit_value.h"

+#include "json_spirit_error_position.h"

+#include <iostream>

+

+namespace json_spirit

+{

+    // functions to reads a JSON values

+

+#ifdef JSON_SPIRIT_VALUE_ENABLED

+    bool read( const std::string& s, Value& value );

+    bool read( std::istream& is,     Value& value );

+    bool read( std::string::const_iterator& begin, std::string::const_iterator end, Value& value );

+

+    void read_or_throw( const std::string& s, Value& value );  

+    void read_or_throw( std::istream& is,     Value& value );

+    void read_or_throw( std::string::const_iterator& begin, std::string::const_iterator end, Value& value );

+#endif

+

+#if defined( JSON_SPIRIT_WVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )

+    bool read( const std::wstring& s, wValue& value );

+    bool read( std::wistream&  is,    wValue& value );

+    bool read( std::wstring::const_iterator& begin, std::wstring::const_iterator end, wValue& value );    

+

+    void read_or_throw( const std::wstring& s, wValue& value );

+    void read_or_throw( std::wistream& is,     wValue& value );

+    void read_or_throw( std::wstring::const_iterator& begin, std::wstring::const_iterator end, wValue& value );

+#endif

+

+#ifdef JSON_SPIRIT_MVALUE_ENABLED

+    bool read( const std::string& s, mValue& value );

+    bool read( std::istream& is,     mValue& value );

+    bool read( std::string::const_iterator& begin, std::string::const_iterator end, mValue& value );

+

+    void read_or_throw( const std::string& s, mValue& value );  

+    void read_or_throw( std::istream& is,     mValue& value );

+    void read_or_throw( std::string::const_iterator& begin, std::string::const_iterator end, mValue& value );

+#endif

+

+#if defined( JSON_SPIRIT_WMVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )

+    bool read( const std::wstring& s, wmValue& value );

+    bool read( std::wistream& is,     wmValue& value );

+    bool read( std::wstring::const_iterator& begin, std::wstring::const_iterator end, wmValue& value );    

+

+    void read_or_throw( const std::wstring& s, wmValue& value );

+    void read_or_throw( std::wistream& is,     wmValue& value );

+    void read_or_throw( std::wstring::const_iterator& begin, std::wstring::const_iterator end, wmValue& value );

+#endif

+}

+

+#endif