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Persistence is the Key

, 24 Jan 2013
Tutorial for using the Calvin C++ persistence library.
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libboost_filesystem-vc71-sgd-1_31.lib
#pragma once

#include <boost/spirit/core.hpp>
#include <boost/spirit/utility/escape_char.hpp>
#include <boost/spirit/utility/confix.hpp>
#include <iostream>
#include <vector>
#include <map>

namespace myparser
{
	using namespace std;
	using namespace boost::spirit;

    struct assign_string
    {
        assign_string(std::string& str_)
        : str(str_) {};

		template<typename IteratorT >
        void operator()(IteratorT first, IteratorT last) const
        {
            str.assign(first, last);
        }

        std::string& str;
    };

	struct keyvalue_grammar : public grammar<keyvalue_grammar>
	{
		keyvalue_grammar(std::string& str_key_, std::string& str_val_)
			: str_key(str_key_), str_val(str_val_){};

        static const int key_start_tag = 1;
        static const int key_tag = 2;
        static const int equal_tag = 3;
        static const int value_tag = 4;
        static const int key_value_tag = 5;
        static const int filechar_p_tag = 6;

        template <typename ScannerT>
        struct definition
        {	
            definition(keyvalue_grammar const& self)  
			{ 
				equal = ch_p('=');
               
                filechar_p = ch_p('.') | ch_p('/') | ch_p('\\') | ch_p(':') | ch_p('_');

				key_value = key >> equal >> value;

				key_start = ch_p('-') | ch_p('/');

				key = key_start >> 
					(+alnum_p)[ assign_string(self.str_key) ];

				//value = ( 
				//		confix_p( 
				//			'"',
				//			(+ c_escape_ch_p )[assign_string(self.str_val)] ,
				//			'"'
				//			)
				//	| (+ alnum_p )[assign_string(self.str_val)] );
                value = confix_p('"', (+(alnum_p | blank_p | filechar_p ))[assign_string(self.str_val)], '"') | (+(alnum_p | filechar_p))[assign_string(self.str_val)];
			}

            rule<ScannerT, parser_context<>, parser_tag<key_start_tag> >  key_start;
            rule<ScannerT, parser_context<>, parser_tag<key_tag> > key;
            rule<ScannerT, parser_context<>, parser_tag<equal_tag> > equal;
            rule<ScannerT, parser_context<>, parser_tag<value_tag> > value;
            rule<ScannerT, parser_context<>, parser_tag<key_value_tag> > key_value;
            rule<ScannerT, parser_context<>, parser_tag<filechar_p_tag> > filechar_p;

            rule<ScannerT, parser_context<>, parser_tag<key_value_tag> > const& start() const { return key_value; };
		};

		std::string& str_key;
		std::string& str_val;
	};


	template<typename keyvalue_container> 
    class add_keyvalue_pair
    {
	public:
		add_keyvalue_pair( keyvalue_container& kvc_, std::string& key_, std::string& val_)
			: kvc( kvc_ ), key(key_), val(val_)
		{
		}

        template <typename IteratorT>
        void operator()(IteratorT first, IteratorT last) const
		{
			kvc.insert( keyvalue_container::value_type(key, val) );
		}
	private:
		std::string& key;
		std::string& val;
		keyvalue_container& kvc;
    };

	template<typename keyvalue_container> 
    struct cmdline_grammar : public grammar< cmdline_grammar >
    {
		cmdline_grammar( keyvalue_container& kvc_, std::string& str_command_)
			: kvc(kvc_), str_command(str_command_)
		{};

        template <typename ScannerT>
        struct definition
        {
            definition( cmdline_grammar<keyvalue_container> const& self )
				: key_value( key, value )
			{ 
				command = *ch_p('"') >> 
                           *((+alnum_p) | ch_p('\\') | ch_p(':') | ch_p('.') | ch_p('_')) >>
                           *ch_p('"');
				line = command >> *( key_value[ add_keyvalue_pair<keyvalue_container>( self.kvc, key, value ) ] );
			}			

            rule<ScannerT> command, line;
			keyvalue_grammar key_value;
			std::string key;
			std::string value;
            rule<ScannerT> const& start() const { return line; }
        };

		keyvalue_container& kvc;
		std::string& str_command;
    };
};

class command_line_parser
{
public:
	typedef std::map< std::string, std::string> keyvalue_container;
	command_line_parser(){};
	~command_line_parser(){};

	bool parse(const std::string& str)
	{
		kvc.clear();

		myparser::cmdline_grammar<keyvalue_container> parser(kvc, command);
		info = boost::spirit::parse(str.c_str(), parser, boost::spirit::space_p);

		return info.full;
	};

	const char* stop() const	{	return info.stop;};

	const string& get_command() const				{	return command;};
	const keyvalue_container& get_keyvalues()const	{	return kvc;};
    const string& get_value( const string& key )    { return kvc[ key ]; }

protected:
	std::string command;
	keyvalue_container kvc;
	parse_info<> info;
};

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This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)

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About the Author

Jay Kint
Web Developer
United States United States
Jay Kint has been a software engineer/hacker for most of his life, starting with 8 bit Ataris. After a lengthy stint in the game industry, he now works at Microsoft in SQL Server.

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