source: source/ariba/utility/configuration/ConfigFile.h@ 4837

// [License]

// ConfigFile.h

// Class for reading named values from configuration files

// Richard J. Wagner  v2.1  24 May 2004  wagnerr@umich.edu



// Copyright (c) 2004 Richard J. Wagner

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to

// deal in the Software without restriction, including without limitation the

// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

// sell copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

// IN THE SOFTWARE.

// [License]





// Typical usage

// -------------

//

// Given a configuration file "settings.inp":

//   atoms  = 25

//   length = 8.0  # nanometers

//   name = Reece Surcher

//

// Named values are read in various ways, with or without default values:

//   ConfigFile config( "settings.inp" );

//   int atoms = config.read<int>( "atoms" );

//   double length = config.read( "length", 10.0 );

//   string author, title;

//   config.readInto( author, "name" );

//   config.readInto( title, "title", string("Untitled") );

//

// See file example.cpp for more examples.



#ifndef CONFIGFILE_H

#define CONFIGFILE_H



#include <string>

#include <map>

#include <iostream>

#include <fstream>

#include <sstream>



using std::string;



class ConfigFile {

// Data

protected:

        string myDelimiter;  // separator between key and value

        string myComment;    // separator between value and comments

        string mySentry;     // optional string to signal end of file

        std::map<string,string> myContents;  // extracted keys and values



        typedef std::map<string,string>::iterator mapi;

        typedef std::map<string,string>::const_iterator mapci;



// Methods

public:

        ConfigFile( string filename,

                    string delimiter = "=",

                    string comment = "#",

                                string sentry = "EndConfigFile" );

        ConfigFile();



        // Search for key and read value or optional default value

        template<class T> T read( const string& key ) const;  // call as read<T>

        template<class T> T read( const string& key, const T& value ) const;

        template<class T> bool readInto( T& var, const string& key ) const;

        template<class T>

        bool readInto( T& var, const string& key, const T& value ) const;



        // Modify keys and values

        template<class T> void add( string key, const T& value );

        void remove( const string& key );



        // Check whether key exists in configuration

        bool keyExists( const string& key ) const;



        // Check or change configuration syntax

        string getDelimiter() const { return myDelimiter; }

        string getComment() const { return myComment; }

        string getSentry() const { return mySentry; }

        string setDelimiter( const string& s )

                { string old = myDelimiter;  myDelimiter = s;  return old; }

        string setComment( const string& s )

                { string old = myComment;  myComment = s;  return old; }



        // Write or read configuration

        friend std::ostream& operator<<( std::ostream& os, const ConfigFile& cf );

        friend std::istream& operator>>( std::istream& is, ConfigFile& cf );



protected:

        template<class T> static string T_as_string( const T& t );

        template<class T> static T string_as_T( const string& s );

        static void trim( string& s );





// Exception types

public:

        struct file_not_found {

                string filename;

                file_not_found( const string& filename_ = string() )

                        : filename(filename_) {} };

        struct key_not_found {  // thrown only by T read(key) variant of read()

                string key;

                key_not_found( const string& key_ = string() )

                        : key(key_) {} };

};





/* static */

template<class T>

string ConfigFile::T_as_string( const T& t )

{

        // Convert from a T to a string

        // Type T must support << operator

        std::ostringstream ost;

        ost << t;

        return ost.str();

}





/* static */

template<class T>

T ConfigFile::string_as_T( const string& s )

{

        // Convert from a string to a T

        // Type T must support >> operator

        T t;

        std::istringstream ist(s);

        ist >> t;

        return t;

}





/* static */

template<>

inline string ConfigFile::string_as_T<string>( const string& s )

{

        // Convert from a string to a string

        // In other words, do nothing

        return s;

}





/* static */

template<>

inline bool ConfigFile::string_as_T<bool>( const string& s )

{

        // Convert from a string to a bool

        // Interpret "false", "F", "no", "n", "0" as false

        // Interpret "true", "T", "yes", "y", "1", "-1", or anything else as true

        bool b = true;

        string sup = s;

        for( string::iterator p = sup.begin(); p != sup.end(); ++p )

                *p = toupper(*p);  // make string all caps

        if( sup==string("FALSE") || sup==string("F") ||

            sup==string("NO") || sup==string("N") ||

            sup==string("0") || sup==string("NONE") )

                b = false;

        return b;

}





template<class T>

T ConfigFile::read( const string& key ) const

{

        // Read the value corresponding to key

        mapci p = myContents.find(key);

        if( p == myContents.end() ) throw key_not_found(key);

        return string_as_T<T>( p->second );

}





template<class T>

T ConfigFile::read( const string& key, const T& value ) const

{

        // Return the value corresponding to key or given default value

        // if key is not found

        mapci p = myContents.find(key);

        if( p == myContents.end() ) return value;

        return string_as_T<T>( p->second );

}





template<class T>

bool ConfigFile::readInto( T& var, const string& key ) const

{

        // Get the value corresponding to key and store in var

        // Return true if key is found

        // Otherwise leave var untouched

        mapci p = myContents.find(key);

        bool found = ( p != myContents.end() );

        if( found ) var = string_as_T<T>( p->second );

        return found;

}





template<class T>

bool ConfigFile::readInto( T& var, const string& key, const T& value ) const

{

        // Get the value corresponding to key and store in var

        // Return true if key is found

        // Otherwise set var to given default

        mapci p = myContents.find(key);

        bool found = ( p != myContents.end() );

        if( found )

                var = string_as_T<T>( p->second );

        else

                var = value;

        return found;

}





template<class T>

void ConfigFile::add( string key, const T& value )

{

        // Add a key with given value

        string v = T_as_string( value );

        trim(key);

        trim(v);

        myContents[key] = v;

        return;

}



#endif  // CONFIGFILE_H



// Release notes:

// v1.0  21 May 1999

//   + First release

//   + Template read() access only through non-member readConfigFile()

//   + ConfigurationFileBool is only built-in helper class

//

// v2.0  3 May 2002

//   + Shortened name from ConfigurationFile to ConfigFile

//   + Implemented template member functions

//   + Changed default comment separator from % to #

//   + Enabled reading of multiple-line values

//

// v2.1  24 May 2004

//   + Made template specializations inline to avoid compiler-dependent linkage

//   + Allowed comments within multiple-line values

//   + Enabled blank line termination for multiple-line values

//   + Added optional sentry to detect end of configuration file

//   + Rewrote messy trimWhitespace() function as elegant trim()