File: conf_enum.c

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/*
**	SWISH++
**	conf_enum.c
**
**	Copyright (C) 2000  Paul J. Lucas
**
**	This program is free software; you can redistribute it and/or modify
**	it under the terms of the GNU General Public License as published by
**	the Free Software Foundation; either version 2 of the License, or
**	(at your option) any later version.
**
**	This program 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 General Public License for more details.
**
**	You should have received a copy of the GNU General Public License
**	along with this program; if not, write to the Free Software
**	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

// standard
#include <iostream>

// local
#include "auto_vec.h"
#include "conf_enum.h"
#include "exit_codes.h"
#include "platform.h"
#include "util.h"

using namespace PJL;
using namespace std;

extern char const*	me;

//*****************************************************************************
//
// SYNOPSIS
//
	conf_enum::conf_enum(
		char const *name, char const *const legal_values[]
	) :
//
// DESCRIPTION
//
//	Construct (initialize) a conf_enum.
//
// PARAMETERS
//
//	name		The name of the configuration variable.
//
//	legal_values	The set of legal values.
//
//*****************************************************************************
	conf<std::string>( name, legal_values[0] ),
	legal_values_( legal_values )
{
	// do nothing else
}

//*****************************************************************************
//
// SYNOPSIS
//
	bool conf_enum::is_legal( char const *value, ostream &err ) const
//
// DESCRIPTION
//
//	Checks to see if a given value is legal, i.e., among the pre-determined
//	set of legal values.
//
// PARAMETERS
//
//	value	The value to be checked.
//
//	err	The ostream to write an error message to, if any.
//
// RETURN VALUE
//
//	Returns true only if the value is legal.
//
//*****************************************************************************
{
	if ( *value ) {
		auto_vec<char> const lower( to_lower_r( value ) );
		for ( char const *const *v = legal_values_; *v; ++v )
			if ( !::strcmp( lower, *v ) )
				return true;
	}
	err << error << '"' << name() << "\" is not one of: ";
	bool comma = false;
	for ( char const *const *v = legal_values_; *v; ++v ) {
		if ( comma )
			err << ", ";
		else
			comma = true;
		err << *v;
	}
	err << '\n';
	return false;
}

//*****************************************************************************
//
// SYNOPSIS
//
	/* virtual */ void conf_enum::parse_value( char *line )
//
// DESCRIPTION
//
//	Parse an enum value from the line of text.  It must be one of the legal
//	values.
//
// PARAMETERS
//
//	line	The line of text to be parsed.
//
//*****************************************************************************
{
	if ( !is_legal( line ) )
		::exit( Exit_Config_File );
	auto_vec<char> lower( to_lower_r( line ) );
	conf<string>::parse_value( lower );
}