//

 //  TimeIntervalFormatter.m

 //  MYUtilities

 //

 //  Copyright 2008 Jens Alfke. All rights reserved.

 //

 #import "TimeIntervalFormatter.h"

 @implementation TimeIntervalFormatter

 - (id) init

 {

     self = [super init];

     if (self != nil) {

         _showsMinutes = YES;

     }

     return self;

 }

 - (void) awakeFromNib

 {

     _showsMinutes = YES;

 }

 - (void) setShowsMinutes: (BOOL)show                {_showsMinutes = show;}

 - (void) setShowsFractionalSeconds: (BOOL)show      {_showsFractionalSeconds = show;}

 + (NSString*) formatTimeInterval: (NSTimeInterval)interval

 {

     TimeIntervalFormatter *fmt = [[self alloc] init];

     NSString *result = [fmt stringForObjectValue: [NSNumber numberWithDouble: interval]];

     [fmt release];

     return result;

 }

 - (NSString*) stringForObjectValue: (id)object

 {

     if (![object isKindOfClass:[NSNumber class]])

         return nil;

     NSTimeInterval time = [object doubleValue];

     NSString *sign;

     if( time==0.0 )

         return nil;

     else if( time < 0.0 ) {

         sign = @"-";

         time = -time;

     } else

         sign = @"";

     if( ! _showsFractionalSeconds )

         time = floor(time);

     int minutes = (int)floor(time / 60.0);

     if( _showsMinutes || minutes>0 ) {

         double seconds = time - 60.0*minutes;

         return [NSString stringWithFormat: (_showsFractionalSeconds ?@"%@%d:%06.3lf" :@"%@%d:%02.0lf"),

                                            sign,minutes,seconds];

     } else {

         return [NSString stringWithFormat: (_showsFractionalSeconds ?@"%@%.3lf" :@"%@%.0lf"),

                                            sign,time];

     }

 }

 - (BOOL)getObjectValue:(id *)anObject

              forString:(NSString *)string 

       errorDescription:(NSString **)error

 {

     NSScanner *scanner = [NSScanner scannerWithString: string];

     [scanner setCharactersToBeSkipped: [NSCharacterSet whitespaceCharacterSet]];

     double seconds;

     if( [scanner isAtEnd] ) {

         seconds = 0.0;

     } else {

         if( ! [scanner scanDouble: &seconds] || seconds<0.0 ) goto error;

         if( [scanner scanString: @":" intoString: NULL] ) {

             double minutes = seconds;

             if( ! [scanner scanDouble: &seconds] || seconds<0.0 ) goto error;

             seconds += 60*minutes;

         }

         if( ! [scanner isAtEnd] ) goto error;

     }

     *anObject = [NSNumber numberWithDouble: seconds];

     return YES;

 error:

     *anObject = nil;

     if( error )

         *error = @"Not a valid time interval";

     return NO;

 }

 - (BOOL)isPartialStringValid:(NSString **)partialStringPtr 

        proposedSelectedRange:(NSRangePointer)proposedSelRangePtr

               originalString:(NSString *)origString 

        originalSelectedRange:(NSRange)origSelRange 

             errorDescription:(NSString **)error

 {

     static NSCharacterSet *sIllegalChars;

     if( ! sIllegalChars )

         sIllegalChars = [[[NSCharacterSet characterSetWithCharactersInString: @"0123456789.:"] 

                                 invertedSet] retain];

     return [*partialStringPtr rangeOfCharacterFromSet: sIllegalChars].length == 0;

 }

 @end