cog/Formatters/SecondsFormatter.m

/*
 *  $Id: SecondsFormatter.m 227 2007-01-21 06:22:13Z stephen_booth $
 *
 *  Copyright (C) 2006 - 2007 Stephen F. Booth <me@sbooth.org>
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#import "SecondsFormatter.h"

@implementation SecondsFormatter

- (NSString *)stringForObjectValue:(id)object {
	NSString *result = nil;
	unsigned value;
	unsigned days = 0;
	unsigned hours = 0;
	unsigned minutes = 0;
	unsigned seconds = 0;

	if(nil == object || NO == [object isKindOfClass:[NSNumber class]] || isnan([object doubleValue])) {
		return @"";
	}

	value = (unsigned)([object doubleValue]);

	seconds = value % 60;
	minutes = value / 60;

	while(60 <= minutes) {
		minutes -= 60;
		++hours;
	}

	while(24 <= hours) {
		hours -= 24;
		++days;
	}

	if(0 < days) {
		result = [NSString stringWithFormat:@"%u:%.2u:%.2u:%.2u", days, hours, minutes, seconds];
	} else if(0 < hours) {
		result = [NSString stringWithFormat:@"%u:%.2u:%.2u", hours, minutes, seconds];
	} else if(0 < minutes) {
		result = [NSString stringWithFormat:@"%u:%.2u", minutes, seconds];
	} else {
		result = [NSString stringWithFormat:@"0:%.2u", seconds];
	}

	return result;
}

- (BOOL)getObjectValue:(id *)object forString:(NSString *)string errorDescription:(NSString **)error {
	NSScanner *scanner = nil;
	BOOL result = NO;
	int value = 0;
	unsigned seconds = 0;

	scanner = [NSScanner scannerWithString:string];

	while(NO == [scanner isAtEnd]) {
		// Grab a value
		if([scanner scanInt:&value]) {
			seconds *= 60;
			seconds += value;
			result = YES;
		}

		// Grab the separator, if present
		[scanner scanString:@":" intoString:NULL];
	}

	if(result && NULL != object) {
		*object = [NSNumber numberWithUnsignedInt:seconds];
	} else if(NULL != error) {
		*error = @"Couldn't convert value to seconds";
	}

	return result;
}

- (NSAttributedString *)attributedStringForObjectValue:(id)object withDefaultAttributes:(NSDictionary *)attributes {
	NSAttributedString *result = nil;

	result = [[NSAttributedString alloc] initWithString:[self stringForObjectValue:object] attributes:attributes];
	return result;
}

@end