"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libbasic' }"

AbstractTime subclass:#Time

	instanceVariableNames:'timeEncoding'

	classVariableNames:''

	poolDictionaries:''

	category:'Magnitude-Time'

!

!Time class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    Instances of time represent a particular time-of-day.

    Since they only store hours, minutes and seconds within a day,

    they cannot be used to compare times across midnight 

    (i.e. they should not be used as timeStamps).

    Use instances of Timestamp (and read the comment there) to do this.

    Examples:

        |t|

        t := Time now.

        Transcript showCR:t.

        |t1 t2|

        t1 := Time now.

        (Delay forSeconds:10) wait.

        t2 := Time now.

        t2 - t1   

    [author:]

        Claus Gittinger

    [see also:]

        Date Timestamp AbstractTime OperatingSystem

        Filename

"

! !

!Time class methodsFor:'instance creation'!

hour:h minute:m

    "compatibility"

    ^ self hours:h minutes:m seconds:0

    "

     Time hour:2 minute:33 

    "

!

hour:h minute:m second:s

    "compatibility"

    ^ self hours:h minutes:m seconds:s

    "

     Time hour:2 minute:33 second:0 

    "

!

hour:h minutes:m seconds:s

    "return an instance of Time representing the given time.

     See also Time now / Date today / Timestamp now.

     Obsolete: please use #hours:minutes:seconds:"

    <resource:#obsolete>

    self obsoleteMethodWarning:'use #hours:minutes:seconds:'.

    ^ self hours:h minutes:m seconds:s

    "

     Time hours:2 minutes:33 seconds:0 

     Time hours:0 minutes:0 seconds:0 

     Time hours:24 minutes:0 seconds:0 

     Time hours23 minutes:59 seconds:59 

    "

    "Modified: 19.4.1996 / 15:32:40 / cg"

!

hours:h minutes:m seconds:s

    "return an instance of Time representing the given time.

     See also Time now / Date today / Timestamp now."

    ^ self basicNew setHours:h minutes:m seconds:s

    "

     Time hours:2 minutes:33 seconds:0 

     Time hours:0 minutes:0 seconds:0 

     Time hours:24 minutes:0 seconds:0 

     Time hours:23 minutes:59 seconds:59 

    "

    "Modified: 19.4.1996 / 15:32:40 / cg"

!

midnight

    "Answer a new instance at midnight."

    ^self fromSeconds: 0

    "

     Time midnight

    "

!

noon

    "Answer a new instance at noon."

    ^self fromSeconds: 43200 "12*60*60"

    "

     Time noon

    "

!

readFrom:aStringOrStream onError:exceptionBlock

    "return a new Time, reading a printed representation from aStream.

     If no am/pm follows the time, the string is interpreted as 

     either 24 hour format or being am."

    ^ [

        |str hour min sec peekC|

        str := aStringOrStream readStream.

        hour := Integer readFrom:str.

        (hour between:0 and:24) ifFalse:[^ exceptionBlock value].

        min := 0.

        sec := 0.

        str atEnd ifFalse:[

            peekC := str peek.

            (peekC == $:) ifTrue:[

                str next.

                min := Integer readFrom:str.

                (min between:0 and:59) ifFalse:[^ exceptionBlock value].

                (str peek == $:) ifTrue:[

                    str next.

                    sec := Integer readFrom:str.

                    (sec between:0 and:59) ifFalse:[^ exceptionBlock value].

                ].

                peekC := str peek.

            ].

            [peekC == Character space] whileTrue:[str next. peekC := str peek].

            (peekC == $p or:[peekC == $P]) ifTrue:[

                str next.

                (str peek == $m or:[str peek == $M]) ifTrue:[

                    str next

                ].

                (hour <= 0 or:[hour > 12]) ifTrue:[^ exceptionBlock value].

                "pm"

                hour ~~ 12 ifTrue:[

                    hour := hour + 12

                ].

                peekC := str peek

            ] ifFalse:[

                (peekC == $a or:[peekC == $A]) ifTrue:[

                    str next.

                    (str peek == $m or:[str peek == $M]) ifTrue:[

                        str next

                    ].

                    hour == 12 ifTrue:[

                        hour := 0.

                    ].

                    hour > 12 ifTrue:[^ exceptionBlock value].

                    peekC := str peek

                ] ifFalse:[

                    "/ cg: dont be too picky here - we do not care, what comes after the

                    "/ time string. (Needed to be able to read rfc822 strings where a timezone

                    "/ follows (-/+0700 GMT, for example)

"/                    peekC notNil ifTrue:[

"/                        peekC isSeparator ifFalse:[^ exceptionBlock value].

"/                    ]

                ].

            ]

        ].

        self basicNew setHours:hour minutes:min seconds:sec

    ] on:Error do:exceptionBlock.

    "

     Time readFrom:'0:00'     

     Time readFrom:'2:00'     

     Time readFrom:'12:00'    

     Time readFrom:'14:00'    

     Time readFrom:'23:00'    

     Time readFrom:'24:00'    

     Time readFrom:'2:30 am'    

     Time readFrom:'2:30 pm'    

     Time readFrom:'14'    

     Time readFrom:'2 am'    

     Time readFrom:'2 pm'    

     Time readFrom:'12:05 pm'    

     Time readFrom:'12:06 am'    

     Time readFrom:'18:22:00'    

     Time readFrom:'14:00:11'    

     Time readFrom:'7:00:11'     

     Time readFrom:'24:00:00'     

     Time readFrom:'0:00:00'     

     Time readFrom:'12:00:00'     

     Time readFrom:'0:00:00'     

     Time readFrom:'6:22:00 pm'   

     Time readFrom:'2:00:11 pm'  

     Time readFrom:'7:00:11 am'  

     Time readFrom:'12:00:00 am'  

     Time readFrom:'0:00:00 am'  

     Time readFrom:'24:00:00 am'  

     Time readFrom:'12:00:00 pm'  

     Time readFrom:'0:00:00 pm' onError:'invalid'

     Time readFrom:'24:00:00 pm'  

    "

    "Modified: 8.10.1996 / 19:32:11 / cg"

! !

!Time class methodsFor:'format strings'!

formatString12us

    "return the format string used to format US times (and other areas)"

    ^ '%u:%m:%s %A'

!

formatString24

    "return the format string used to format non US times"

    ^ '%h:%m:%s'

! !

!Time methodsFor:'Compatibility-Squeak'!

intervalString

    "Treat the time as a difference.  

     Give it in hours and minutes with two digits of accuracy."

    |hours minutes seconds hh mm ss s|

    hours := self hours.

    minutes := self minutes.

    seconds := self seconds.

    hours = 0   

        ifTrue: [hh := ''] 

        ifFalse: [

            hh := hours printString, ' hour'.

            hours > 1 ifTrue:[

                hh := hh , 's'

            ]

        ].

    minutes = 0 

        ifTrue: [mm := ''] 

        ifFalse: [

            mm := minutes printString, ' minute'.

            minutes > 1 ifTrue:[

                mm := mm , 's'

            ]

        ].

    seconds = 0 

        ifTrue: [ss := ''] 

        ifFalse: [

            ss := seconds printString, ' second'.

            seconds > 1 ifTrue:[

                ss := ss , 's'

            ]

        ].

    "/ do not show seconds, if hours are there

    hh size > 0 ifTrue: [ss := ''].

    s := hh.

    mm notEmpty ifTrue:[

        s notEmpty ifTrue:[

            s := s , ' '

        ].

        s := s , mm.

    ].

    ss notEmpty ifTrue:[

        s notEmpty ifTrue:[

            s := s , ' '

        ].

        s := s , ss

    ].

    ^ s

    "

     (Time fromSeconds:3600) intervalString     

     (Time fromSeconds:3605) intervalString    

     (Time fromSeconds:3700) intervalString    

     (Time fromSeconds:5) intervalString       

     (Time fromSeconds:65) intervalString      

    "

!

print24:prnt24FormatBoolean on:aStream

    "print me either US or 24hr format on a stream"

    ^ self print24:prnt24FormatBoolean showSeconds:true on:aStream

    "

     Time now print24:true on:Transcript. Transcript cr.

     Time now print24:false on:Transcript. Transcript cr.

    "

!

print24:prnt24Format showSeconds:doSeconds on:aStream

    "print me either US or 24hr format, optionally with

     seconds on a stream"

    |format|

    prnt24Format ifTrue:[

        doSeconds ifTrue:[

            format := '%h:%m:%s'

        ] ifFalse:[

            format := '%h:%m'

        ].

    ] ifFalse:[

        "/ US format

        doSeconds ifTrue:[

            format := '%u:%m:%s %a'

        ] ifFalse:[

            format := '%u:%m %a'

        ].

    ].

    ^ self

        printOn:aStream 

        format:format.

    "

     Time now print24:true showSeconds:true on:Transcript. Transcript cr.

     Time now print24:false showSeconds:true on:Transcript. Transcript cr.

     Time now print24:true showSeconds:false on:Transcript. Transcript cr.

     Time now print24:false showSeconds:false on:Transcript. Transcript cr.

    "

! !

!Time methodsFor:'accessing'!

hours

    "return the number of hours since midnight (i.e. 0..23)"

    ^ self getSeconds // 3600

    "

     Time now hours

    "

!

milliseconds

    "time does not keep milliseconds 

     - for compatibility with Timestamp"

    ^ 0

!

minutes

    "return the number of minutes within the hour (i.e. 0..59)"

    ^ (self getSeconds \\ 3600) // 60

    "

     Time now minutes

    "

!

seconds

    "return the number of seconds within the minute (i.e. 0..59)"

    ^ self getSeconds \\ 60

    "

     Time now seconds

    "

!

timeZoneDeltaInMinutes

    "answer the number of minutes between local time and utc time.

     Delta is positive if local time is ahead of utc, negative if behind utc.

     Time is local time, so answer the delta of today"

    ^ Timestamp now timeZoneDeltaInMinutes

    "

      Time now timeZoneDeltaInMinutes

    "

! !

!Time methodsFor:'comparing'!

< aTime

    "return true if the receiver is before the argument"

    aTime class == self class ifTrue:[

        ^ timeEncoding < aTime timeEncoding

    ].

    ^ self getSeconds < aTime getSeconds

!

= aTime

    "return true if the argument, aTime represents the same timeOfDay"

    aTime class == self class ifTrue:[

        ^ timeEncoding = aTime timeEncoding

    ].

    (aTime species == self species) ifFalse:[^ false].

    ^ self getSeconds = aTime getSeconds

    "Modified: / 18-07-2007 / 14:16:34 / cg"

!

> aTime

    "return true if the receiver is before the argument"

    aTime class == self class ifTrue:[

        ^ timeEncoding > aTime timeEncoding

    ].

    ^ self getSeconds > aTime getSeconds

!

hash

    "return an integer useful for hashing on times"

    ^ timeEncoding

! !

!Time methodsFor:'converting'!

asSeconds

    "return the number of seconds elapsed since midnight"

    ^ self getSeconds

    "

     Time now asSeconds

     (TimeDuration days:1) asSeconds 

    "

!

asTime

    "return a Time object from the receiver - thats the receiver."