reader.h

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/**
    @file
    @author Alexander Sherikov
 
    @copyright 2018-2020 Alexander Sherikov, Licensed under the Apache License, Version 2.0.
    (see @ref LICENSE or http://www.apache.org/licenses/LICENSE-2.0)
 
    @brief
*/
 
#pragma once
 
 
namespace ariles2
{
    namespace ns_jsonnet
    {
        namespace impl
        {
            class JsonnetPreprocessor;
 
            class Reader
            {
            protected:
                using JsonnetPreprocessorPtr = std::shared_ptr<JsonnetPreprocessor>;
 
            protected:
                JsonnetPreprocessorPtr preprocessor_;
 
 
            public:
                Reader();
                ~Reader();
 
 
                const char *fromFile(const std::string &file_name);
                const char *fromString(const std::string &input_string);
            };
        }  // namespace impl
 
 
        template <class t_ParentVisitor>
        class Reader : public t_ParentVisitor
        {
        protected:
            impl::Reader impl_;
 
 
        public:
            explicit Reader(const std::string &file_name)
            {
                const char *jsonnet_output = impl_.fromFile(file_name);
                t_ParentVisitor::constructFromString(jsonnet_output);
            }
 
 
            explicit Reader(std::istream &input_stream)
            {
                std::string input_string;
                char buffer[4096];
                while (input_stream.read(buffer, sizeof(buffer)))
                {
                    input_string.append(buffer, sizeof(buffer));
                }
                input_string.append(buffer, input_stream.gcount());
 
 
                const char *jsonnet_output = impl_.fromString(input_string);
                t_ParentVisitor::constructFromString(jsonnet_output);
            }
        };
    }  // namespace ns_jsonnet
}  // namespace ariles2