Kernel.hh

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#pragma once
 
#include <functional>
#include "Props.hh"
 
 
namespace cadabra {
 
    class Kernel {
        public:
            Kernel(bool inject_defaults=true);
            Kernel(const Kernel& other) = delete;
            ~Kernel();
 
            void inject_property(property *prop, std::shared_ptr<Ex> pattern, std::shared_ptr<Ex> property_arguments);
 
            std::shared_ptr<Ex> ex_from_string(const std::string&);
 
            
            Properties properties;
 
            enum class scalar_backend_t { sympy, mathematica } scalar_backend;
            bool                                               call_embedded_python_functions;
            bool                                               display_fractions;
 
 
            const static std::string version;
            const static std::string build  ;
 
            // Warnings 
            enum class warn_t {
                notset   = 0,
                debug    = 10,
                info     = 20,
                warning  = 30,
                error    = 40,
                critical = 50
            };
            warn_t warning_level;
            std::function<void(const std::string&)> warning_callback;
            void warn(const std::string& msg, warn_t level = warn_t::warning) const;
        };
 
    }