winix/core/mountparser.cpp

/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2010, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#include "mountparser.h"
#include "data.h"
#include "log.h"
#include "misc.h"


bool MountParser::IsWhite(int c)
{
	if( c==' ' || c=='\t' || c==13 || c==160 )
		return true;
	
return false;
}


void MountParser::SkipWhite()
{
	while( IsWhite(*pinput) )
		++pinput;
}


void MountParser::SkipLine()
{
	while( *pinput && *pinput != 10 )
		++pinput;
		
	if( *pinput == 10 )
		++pinput;
}


void MountParser::ReadWordQuote(std::string & res)
{
	++pinput;

	while( *pinput && *pinput!=10 && *pinput!='\"' )
	{
		if( pinput[0]=='\\' && pinput[1]=='\"' )
		{
			res    += '\"';
			pinput += 2;
		}
		else
		if( pinput[0]=='\\' && pinput[1]=='\\' )
		{
			res    += '\\';
			pinput += 2;
		}
		else
		{
			res    += *pinput;
			pinput += 1;
		}
	}

	if( *pinput == '"' )
		++pinput;
}


// a white character is the separator
void MountParser::ReadWordWhite(std::string & res)
{
	while( *pinput && *pinput!=10 && !IsWhite(*pinput) )
	{
		res += *pinput;
		++pinput;
	}
}


// the comma or the second bracket ')' are the separators
void MountParser::ReadWordComma(std::string & res)
{
	while( *pinput && *pinput!=10 && *pinput!=',' && *pinput!=')' )
	{
		res += *pinput;
		++pinput;
	}

	// trimming last white characters
	// (white characters can be in the middle of the string)
	TrimWhite(res); 
}


void MountParser::ReadWord(std::string & res, bool comma_bracket_separator)
{
	res.clear();
	SkipWhite();
	
	if( *pinput == '"' )
	{
		ReadWordQuote(res);
	}
	else
	if( comma_bracket_separator )
	{
		ReadWordComma(res);
	}
	else
	{
		ReadWordWhite(res);
	}
}




void MountParser::ReadParamArgsLoop(Mount::ParamArg & args)
{
	SkipWhite();

	while( *pinput && *pinput!=10 && *pinput!=')' )
	{
		ReadWord(temp_arg, true);

		if( !temp_arg.empty() )
			args.push_back(temp_arg);

		if( *pinput == ',' )
			++pinput;	
	}
}


void MountParser::ReadParamArgs(Mount::ParamArg & args)
{
	SkipWhite();
	args.clear();


	if( *pinput == '(' )
	{
		++pinput;
		ReadParamArgsLoop(args);
		
		if( *pinput != ')' )
		{
			// there should be ')' at the end
			// temporarily we do nothing	
		}
		else
		{
			++pinput;	
		}
	}
}



void MountParser::ReadParamName(std::string & res)
{
	SkipWhite();
	res.clear();
	
	while( *pinput && *pinput!=10 && *pinput!=',' && *pinput!='(' && !IsWhite(*pinput) )
	{
		res += *pinput;
		++pinput;
	}
}


void MountParser::ReadParam(std::string & res, Mount::ParamArg & args)
{
	ReadParamName(res);

	if( res.empty() )
		return;
		
	ReadParamArgs(args);

	SkipWhite();

	if( *pinput == ',' )
		++pinput;
}



void MountParser::ReadMountType()
{
	ReadWord(temp);

	if( temp.empty() )
	{
		// an empty line (some white characters only)
		err = WINIX_ERR_EMPTY;
	}
	else
	if( temp == "cms" )
	{
		mount.type = Mount::cms;
		log << log3 << "MP: mount type: cms" << logend;	
	}
	else
	if( temp == "thread" )
	{
		mount.type = Mount::thread;
		log << log3 << "MP: mount type: thread" << logend;
	}
	else
	if( temp == "ticket" )
	{
		mount.type = Mount::ticket;
		log << log3 << "MP: mount type: ticket" << logend;
	}
	else
	{
		err = WINIX_ERR_MOUNT_UNKNOWN;
		log << log1 << "MP: unknown mount type: " << temp << logend;
	}
}



void MountParser::ReadMountPoint()
{
	ReadWord(temp);

	pdir = data.dirs.GetDir(temp);
	
	if( pdir )
	{
		mount.dir_id = pdir->id;
		log << log3 << "MP: mount point: " << temp << logend;	
	}
	else
	{
		err = WINIX_ERR_NO_MOUNTPOINT;
		log << log1 << "MP: there is no such a mount point: " << temp << logend;
	}
}



void MountParser::ReadFs()
{
	ReadWord(temp);

	if( temp == "simplefs" )
	{
		mount.fs = Mount::simplefs;
		log << log1 << "MP: file system: simplefs" << logend;
	}
	else
	if( temp == "hashfs" )
	{
		mount.fs = Mount::hashfs;
		log << log1 << "MP: file system: hashfs" << logend;	
	}
	else
	{
		err = WINIX_ERR_UNKNOWN_FILESYSTEM;
		log << log1 << "MP: unknown filesystem: " << temp << logend;
	}
}



void MountParser::LogMountParams()
{
size_t i;

	log << log3 << "MP: mount param: " << temp << "(";

	for(i=0 ; i<param_args.size() ; ++i)
	{
		log << param_args[i];

		if( i != param_args.size()-1 )
			log << ",";
	}

	log << ")" << logend;
}



void MountParser::ReadMountParams()
{
	mount.ClearParams();
	
	for( ReadParam(temp, param_args) ; !temp.empty() ; ReadParam(temp, param_args) )
	{
		Mount::ParamCode p = Mount::ParseParam(temp.c_str());

		if( p != Mount::par_none )
		{
			mount.param[p].defined = true;
			mount.param[p].arg     = param_args;
			LogMountParams();
		}
		else
		{
			log << log1 << "MP: unknown mount param: " << temp << " (skipped)" << logend;
		}
	}	
}



void MountParser::ReadRow(std::map<long, Mount> & output)
{
	ReadMountType();	

	if( err == WINIX_ERR_EMPTY )
	{
		err = WINIX_ERR_OK;
		SkipLine();
		return;
	}

	if( err == WINIX_ERR_OK )
		ReadMountPoint();

	if( err == WINIX_ERR_OK )
		ReadFs();

	if( err == WINIX_ERR_OK )
		ReadMountParams();

	if( err == WINIX_ERR_OK )
	{
		std::pair<std::map<long, Mount>::iterator, bool> res = output.insert( std::make_pair(mount.dir_id, mount) );
	
		if( !res.second )
			log << log1 << "MP: this mount point exists (skipped)" << logend;
	}

	SkipLine();
}




Error MountParser::Parse(const std::string & input, std::map<long, Mount> & output)
{
	pinput = input.c_str();
	err    = WINIX_ERR_OK;
	output.clear();
	
	while( *pinput && err == WINIX_ERR_OK )
		ReadRow(output);
		
return err;
}