gline.cpp

/***************************************************************************
    gline.cpp - Configuration file parser (.ini)
    Copyright (C) 2003 John Klar (paladin at projectplasma dot com)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 ***************************************************************************/

#include <map>
#include <string>
#include <iostream>
#include <fstream>
using namespace std;

#include "gline.h"

int
gline::parse(const char *fname) {

	int i,j, pos,len;
	string sect, line, key, value;

	ifstream in(fname);

	i=0;
	while(getline(in,line)) {

		// strip inline comments
		if((j=line.find('#')) != line.npos)
			line.erase(j);
		
		// strip trailing whitespace
		for(j=line.length()-1; j>=0 && isspace(line[j]); --j)
			/* seeking */;
		line.erase(j+1);

		if(line.size()>0) {
			// should probably trim leading spacess
			switch(line[0]) {
			case ';':
			case '#':
			case ' ':
			case '\t':
				break;

			case '[':
				// extractSection(line,sect);
				if((pos=line.find_last_of(']'))!=line.npos) {
					StringMap smap;

					sect = line.substr(1,pos-1);
					config[sect]=smap;
				}
				break;

			default:
				// extractPair
				if((pos=line.find('='))!=line.npos) {
					key = line.substr(0,pos);
					value = line.substr(pos+1);
					delete_spaces(key);
					delete_spaces(value);
					config[sect][key]=value;
				}

			}
		}

	}

	return 0;
}

int
gline::exists(const char *section, const char *key) {
	if(section==NULL)
		return 0;
	if( config.find(section) != config.end() ) {
		if( key != NULL ) {
			if( config[section].find(key) != config[section].end() )
				return 1;
			else
				return 0;
		}
		return 1;
	}
	return 0;
}

StringMap &
gline::operator[](const char *section) {
	return config[section];
}

int
gline::open(const char *fname) {
	return parse(fname);
}

void gline::delete_spaces(string &str)
{
	bool inv_commas = 0;
	string::iterator i;
	for(i=str.begin(); i < str.end(); i++)
	{
		if ((*i == ' ' || *i== '\t') && !inv_commas)
		{
			//whitespace
			str.erase(i);
			i--;
		}
		else if ((*i == '#' || *i== ';') && !inv_commas)
		{
			//comments
			str.erase(i, str.end());
			i = str.end()-1;
		}
		else if (*i == '"')
		{
			//inverted commas
			str.erase(i);
			i--;
			inv_commas = !inv_commas;
		}
	}
}