143 lines
3.5 KiB
C++
143 lines
3.5 KiB
C++
// ConfigFile.cpp
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#include "ConfigFile.h"
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using std::string;
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ConfigFile::ConfigFile( string filename, string delimiter,
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string comment, string sentry )
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: myDelimiter(delimiter), myComment(comment), mySentry(sentry)
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{
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// Construct a ConfigFile, getting keys and values from given file
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std::ifstream in( filename.c_str() );
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if( !in ) throw file_not_found( filename );
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in >> (*this);
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}
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ConfigFile::ConfigFile()
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: myDelimiter( string(1,'=') ), myComment( string(1,'#') )
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{
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// Construct a ConfigFile without a file; empty
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}
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void ConfigFile::remove( const string& key )
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{
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// Remove key and its value
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myContents.erase( myContents.find( key ) );
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return;
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}
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bool ConfigFile::keyExists( const string& key ) const
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{
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// Indicate whether key is found
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mapci p = myContents.find( key );
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return ( p != myContents.end() );
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}
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/* static */
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void ConfigFile::trim( string& s )
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{
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// Remove leading and trailing whitespace
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static const char whitespace[] = " \n\t\v\r\f";
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s.erase( 0, s.find_first_not_of(whitespace) );
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s.erase( s.find_last_not_of(whitespace) + 1U );
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}
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std::ostream& operator<<( std::ostream& os, const ConfigFile& cf )
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{
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// Save a ConfigFile to os
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for( ConfigFile::mapci p = cf.myContents.begin();
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p != cf.myContents.end();
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++p )
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{
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os << p->first << " " << cf.myDelimiter << " ";
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os << p->second << std::endl;
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}
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return os;
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}
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std::istream& operator>>( std::istream& is, ConfigFile& cf )
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{
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// Load a ConfigFile from is
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// Read in keys and values, keeping internal whitespace
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typedef string::size_type pos;
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const string& delim = cf.myDelimiter; // separator
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const string& comm = cf.myComment; // comment
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const string& sentry = cf.mySentry; // end of file sentry
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const pos skip = delim.length(); // length of separator
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string nextline = ""; // might need to read ahead to see where value ends
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while( is || nextline.length() > 0 )
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{
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// Read an entire line at a time
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string line;
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if( nextline.length() > 0 )
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{
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line = nextline; // we read ahead; use it now
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nextline = "";
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}
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else
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{
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std::getline( is, line );
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}
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// Ignore comments
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line = line.substr( 0, line.find(comm) );
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// Check for end of file sentry
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if( sentry != "" && line.find(sentry) != string::npos ) return is;
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// Parse the line if it contains a delimiter
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pos delimPos = line.find( delim );
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if( delimPos < string::npos )
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{
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// Extract the key
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string key = line.substr( 0, delimPos );
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line.replace( 0, delimPos+skip, "" );
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// See if value continues on the next line
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// Stop at blank line, next line with a key, end of stream,
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// or end of file sentry
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bool terminate = false;
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while( !terminate && is )
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{
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std::getline( is, nextline );
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terminate = true;
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string nlcopy = nextline;
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ConfigFile::trim(nlcopy);
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if( nlcopy == "" ) continue;
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nextline = nextline.substr( 0, nextline.find(comm) );
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if( nextline.find(delim) != string::npos )
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continue;
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if( sentry != "" && nextline.find(sentry) != string::npos )
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continue;
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nlcopy = nextline;
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ConfigFile::trim(nlcopy);
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if( nlcopy != "" ) line += "\n";
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line += nextline;
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terminate = false;
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}
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// Store key and value
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ConfigFile::trim(key);
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ConfigFile::trim(line);
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cf.myContents[key] = line; // overwrites if key is repeated
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}
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}
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return is;
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}
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