Initfile.cc 3.6 KB
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#include "Initfile.h"

#include <string>
#include <stdexcept>
#include <iostream>
#include <sstream>
using namespace std;

/// the small parser for the initfile. see description of read(Initfile&, istream&)
struct Parser {
	Parser(const string& line) {
		size_t pos= line.find(':');
		if (pos == string::npos)
			throw runtime_error("cannot find the delimiter ':' in line '"+line+"'");
		name= line.substr(0, pos);
		value= line.substr(pos+1, line.length() - (pos + 1));
		// remove everything after the %
		pos= value.find('%');
		if (pos != string::npos) {
			value= value.substr(0, pos);
		}
	}
	string name;
	string value;
};

Initfile* Initfile::singlett= NULL;
std::set< std::string > Initfile::fn_include_list;

/// initialize singleton object an global parameters
void Initfile::init(std::string in) {
	initIntern();
	singlett->clear();
	fn_include_list.clear();
	singlett->read(in);
	
	singlett->getInternalParameters();
	
	// initialize global strcutures using parameters
	Global::init();
};

/// Fill an initfile from a file with filename fn
void Initfile::read(std::string fn) {
// read file if its not parsed already
	if (fn_include_list.find(fn)==fn_include_list.end()) {
		std::ifstream inputFile;
		inputFile.open(fn.c_str(), std::ios::in);
		if (!inputFile.is_open())
			throw runtime_error("init-file cannot be opened for reading");
		
		fn_include_list.insert(fn);
		read(inputFile);
	}
};

/// Fill an initfile from an input stream
void Initfile::read(istream& in) {
	unsigned line_length= 256;
	char swap[line_length];
	in.getline(swap, line_length);
	while (in.good()) {
		std::string whitespaces= " \t\r\f";
		std::string sw(swap);
		size_t pos0= sw.find_first_not_of(whitespaces);
		
		if (pos0!=std::string::npos && sw[pos0]!='%' && sw[pos0]!='#' && sw[pos0]!=0) {
		// parse line and extract map: tag->value
			Parser parser(sw);
			operator[](parser.name)= parser.value;
		} else if (sw[pos0]=='#' && static_cast<size_t>(sw.find("#include"))==pos0) {
		// include file by '#include "filename"' or '#include <filename>'
			size_t pos= sw.find_first_not_of(whitespaces,std::string("#include").size()+1);
			size_t epos= 0;
			std::string fn= "";
			std::stringstream errorMsg;
			switch (char c= swap[pos++]) {
			case '<':
				c= '>';
			case '\"':
				whitespaces+= c;
				epos= sw.find_first_of(whitespaces, pos);
				fn= sw.substr(pos,epos-pos);
			
				if (sw[epos]!=c) {
					errorMsg << "filename in #include not terminated by " << c;
					throw std::runtime_error(errorMsg.str());
				}
				break;
			default:
				throw std::runtime_error("no filename given for #include");
			}
			read(fn);
		}
		in.getline(swap, line_length);
	}
};

/// read standard values for output and information of parameter-values
void Initfile::getInternalParameters() 
{
	int val= 10;
	get("level of information", val, 0);
	msgInfo= val;
	
	val= 1;
	get("WAIT", val, 0);
	msgWait= val;
	
	val= 1;
	get("parameter information", val, 0);
	paramInfo= val;
	
	if (msgInfo==0)
		paramInfo= 0;
};

/// print all parameters to std::cout
void Initfile::printParameters() {
	initIntern();
	Initfile::iterator it;
	for (it= singlett->begin(); it!=singlett->end(); it++)
		std::cout << (*it).first << " => " << (*it).second << std::endl;
};

/// Write data-map to initfile
void Initfile::write(ostream& out) {
	Initfile::iterator it;
	for (it= begin() ; it!=end(); it++)
		out << (*it).first << ": " << (*it).second << std::endl;
	
};

/// Write data-map to initfile
void Initfile::write(std::string fn) {
	std::ofstream outFile;
	outFile.open(fn.c_str(), std::ios::out);
	if (!outFile.is_open())
		throw runtime_error("init-file cannot be opened for writing");
	
	write(outFile);
};