source: source/ariba/utility/configuration/ConfigFile.cpp@ 6797

// [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]



#include "ConfigFile.h"



using std::string;



ConfigFile::ConfigFile( string filename, string delimiter,

                        string comment, string sentry )

        : myDelimiter(delimiter), myComment(comment), mySentry(sentry)

{

        // Construct a ConfigFile, getting keys and values from given file



        std::ifstream in( filename.c_str() );



        if( !in ) throw file_not_found( filename );



        in >> (*this);

}





ConfigFile::ConfigFile()

        : myDelimiter( string(1,'=') ), myComment( string(1,'#') )

{

        // Construct a ConfigFile without a file; empty

}





void ConfigFile::remove( const string& key )

{

        // Remove key and its value

        myContents.erase( myContents.find( key ) );

        return;

}





bool ConfigFile::keyExists( const string& key ) const

{

        // Indicate whether key is found

        mapci p = myContents.find( key );

        return ( p != myContents.end() );

}





/* static */

void ConfigFile::trim( string& s )

{

        // Remove leading and trailing whitespace

        static const char whitespace[] = " \n\t\v\r\f";

        s.erase( 0, s.find_first_not_of(whitespace) );

        s.erase( s.find_last_not_of(whitespace) + 1U );

}





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

{

        // Save a ConfigFile to os

        for( ConfigFile::mapci p = cf.myContents.begin();

             p != cf.myContents.end();

                 ++p )

        {

                os << p->first << " " << cf.myDelimiter << " ";

                os << p->second << std::endl;

        }

        return os;

}





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

{

        // Load a ConfigFile from is

        // Read in keys and values, keeping internal whitespace

        typedef string::size_type pos;

        const string& delim  = cf.myDelimiter;  // separator

        const string& comm   = cf.myComment;    // comment

        const string& sentry = cf.mySentry;     // end of file sentry

        const pos skip = delim.length();        // length of separator



        string nextline = "";  // might need to read ahead to see where value ends



        while( is || nextline.length() > 0 )

        {

                // Read an entire line at a time

                string line;

                if( nextline.length() > 0 )

                {

                        line = nextline;  // we read ahead; use it now

                        nextline = "";

                }

                else

                {

                        std::getline( is, line );

                }



                // Ignore comments

                line = line.substr( 0, line.find(comm) );



                // Check for end of file sentry

                if( sentry != "" && line.find(sentry) != string::npos ) return is;



                // Parse the line if it contains a delimiter

                pos delimPos = line.find( delim );

                if( delimPos < string::npos )

                {

                        // Extract the key

                        string key = line.substr( 0, delimPos );

                        line.replace( 0, delimPos+skip, "" );



                        // See if value continues on the next line

                        // Stop at blank line, next line with a key, end of stream,

                        // or end of file sentry

                        bool terminate = false;

                        while( !terminate && is )

                        {

                                std::getline( is, nextline );

                                terminate = true;



                                string nlcopy = nextline;

                                ConfigFile::trim(nlcopy);

                                if( nlcopy == "" ) continue;



                                nextline = nextline.substr( 0, nextline.find(comm) );

                                if( nextline.find(delim) != string::npos )

                                        continue;

                                if( sentry != "" && nextline.find(sentry) != string::npos )

                                        continue;



                                nlcopy = nextline;

                                ConfigFile::trim(nlcopy);

                                if( nlcopy != "" ) line += "\n";

                                line += nextline;

                                terminate = false;

                        }



                        // Store key and value

                        ConfigFile::trim(key);

                        ConfigFile::trim(line);

                        cf.myContents[key] = line;  // overwrites if key is repeated

                }

        }



        return is;

}