"

 COPYRIGHT (c) 1988 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' }"

ArithmeticValue subclass:#Number

	instanceVariableNames:''

	classVariableNames:'DecimalPointCharacter DecimalPointCharacters'

	poolDictionaries:''

	category:'Magnitude-Numbers'

!

!Number class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1988 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

"

    abstract superclass for all kinds of numbers

    [author:]

	Claus Gittinger

    [see also:]

	Integer LargeInteger SmallInteger

	LimitedPrecisionReal Float ShortFloat

	Fraction FixedPoint

"

! !

!Number class methodsFor:'instance creation'!

fromString:aString

    "for compatibility with other smalltalks - same as #readFrom:"

    |s num|

    s := aString readStream.

    num := self readFrom:s onError:[^ self error:'invalid number'].

    s atEnd ifFalse:[^ self error:'garbage at end of number'].

    ^ num.

    "

     Number fromString:'12345'

     Number fromString:'abc'

     Number fromString:'1abc'

     '12345' asNumber

    "

    "Modified: / 3.8.1998 / 20:05:11 / cg"

!

fromString:aString onError:exceptionBlock

    "for compatibility with other smalltalks - same as #readFrom:"

    ^ self readFrom:aString onError:exceptionBlock

    "

     Number fromString:'12345' onError:0

     Number fromString:'fooBarBaz' onError:0

    "

    "Modified: / 3.8.1998 / 20:05:34 / cg"

!

readFrom:aStringOrStream onError:exceptionBlock

    "return the next Number from the (character-)stream aStream;

     skipping all whitespace first; return the value of exceptionBlock,

     if no number can be read.

     This method is less strict than the smalltalk number reader; it

     allows for prefixed + and also allows missing fractional part after eE"

    ^ [

        |value intValue mantissaAndScale scale decimalPointCharacters decimalMantissa str 

         nextChar radix negative signExp exp denom|

        decimalPointCharacters := self decimalPointCharacters.

        str := aStringOrStream readStream.

        nextChar := str skipSeparators.

        nextChar isNil ifTrue:[^ exceptionBlock value].

        (nextChar == $-) ifTrue:[

            negative := true.

            str next.

            nextChar := str peekOrNil

        ] ifFalse:[

            negative := false.

            (nextChar == $+) ifTrue:[

                str next.

                nextChar := str peekOrNil

            ]

        ].

        (nextChar isDigit or:[(decimalPointCharacters includes:nextChar)]) ifFalse:[

            ^ exceptionBlock value.

"/          value := super readFrom:str.

"/          negative ifTrue:[value := value negated].

"/          ^ value

        ].

        (decimalPointCharacters includes:nextChar) ifTrue:[

            radix := 10.

            value := 0.0.

            intValue := 0.

        ] ifFalse:[

            value := Integer readFrom:str radix:10.

            nextChar := str peekOrNil.

            ((nextChar == $r) or:[ nextChar == $R]) ifTrue:[

                str next.

                radix := value.

                value := Integer readFrom:str radix:radix.

            ] ifFalse:[

                radix := 10

            ].

            intValue := value.

        ].

        (decimalPointCharacters includes:nextChar) ifTrue:[

            str next.

            nextChar := str peekOrNil.

            scale := 0.

            decimalMantissa := 0.

            (nextChar notNil and:[nextChar isDigitRadix:radix]) ifTrue:[

                mantissaAndScale := Number readMantissaAndScaleFrom:str radix:radix.

                value := value asFloat + (mantissaAndScale first).

                nextChar := str peekOrNil

            ]

        ].

        ('eEdDqQ' includes:nextChar) ifTrue:[

            str next.

            nextChar := str peekOrNil.

            signExp := 1.

            (nextChar == $+) ifTrue:[

                str next.

                nextChar := str peekOrNil.

            ] ifFalse:[

                (nextChar == $-) ifTrue:[

                    str next.

                    nextChar := str peekOrNil.

                    signExp := -1

                ]

            ].

            ('qQ' includes:nextChar) ifTrue:[

                value := value asLongFloat.

            ] ifFalse:[

                value := value asFloat.

"/ future: (for now, always create Doubles for Dolphin,Squeak etc. compatibility

"/                ('eE' includes:nextChar) ifTrue:[

"/                    value := value asShortFloat

"/                ]

            ].

            (nextChar notNil and:[(nextChar isDigitRadix:radix)]) ifTrue:[

                exp := (Integer readFrom:str radix:radix) * signExp.

                value := value * ((value class unity * 10.0) raisedToInteger:exp)

            ]

        ] ifFalse:[

            ('s' includes:nextChar) ifTrue:[

                mantissaAndScale isNil ifTrue:[

                    value := intValue asFixedPoint:0.

                ] ifFalse:[

                    denom := 10 raisedTo:mantissaAndScale last.

                    value := FixedPoint 

                                numerator:(intValue * denom) + (mantissaAndScale second)

                                denominator:denom

                                scale:mantissaAndScale last.

                ].

            ] ifFalse:[

                value isLimitedPrecisionReal ifTrue:[

                    value := value asFloat.

                ]

            ].

        ].

        negative ifTrue:[

            value := value negated

        ].

        value.

    ] on:Error do:exceptionBlock

    "

     Number readFrom:(ReadStream on:'54.32e-01')      

     Number readFrom:(ReadStream on:'12345678901234567890') 

     Number readFrom:(ReadStream on:'12345678901234567890.0') 

     Number readFrom:(ReadStream on:'12345678901234567890.012345678901234567890') 

     Number readFrom:(ReadStream on:'16rAAAAFFFFAAAAFFFF') 

     Number readFrom:'16rAAAAFFFFAAAAFFFF' 

     Number readFrom:'0.000001'  

     '+00000123.45' asNumber  

     Number readFrom:'99s'      

     Number readFrom:'99.00s'      

     Number readFrom:'99.0000000s'      

     Number readFrom:'.0000000s'      

     Number readFrom:'.0000000q'      

     Number readFrom:'.0000000f'      

     Number readFrom:'.0000000e'      

     Number readFrom:'.0000000s1'      

     Number readFrom:'.0000000q1'      

     Number readFrom:'.0000000f1'      

     Number readFrom:'.0000000e1'      

     DecimalPointCharacters := #( $. $, ).   

     Number readFrom:'99,00'      

     DecimalPointCharacters := #( $. ).   

     Number readFrom:'99,00'      

    "

    "Modified: / 14.4.1998 / 19:22:50 / cg"

!

readSmalltalkSyntaxFrom:aStream

    "ST-80 compatibility (thanks to a note from alpha testers)

     read and return the next Number in smalltalk syntax from the 

     (character-) aStream.

     Returns nil if aStream contains no valid number."

    ^ Scanner scanNumberFrom:aStream

"/    ^ Compiler evaluate:aStream compile:false "/ self readFrom:aStream.

    "

     Number readSmalltalkSyntaxFrom:'99d'    

     Number readSmalltalkSyntaxFrom:'99.00d'    

     Number readSmalltalkSyntaxFrom:(ReadStream on:'54.32e-01')    

     Number readSmalltalkSyntaxFrom:(ReadStream on:'12345678901234567890')

     Number readSmalltalkSyntaxFrom:(ReadStream on:'16rAAAAFFFFAAAAFFFF')

     Number readSmalltalkSyntaxFrom:(ReadStream on:'(1/10)') 

     Number readFrom:(ReadStream on:'(1/10)') 

     Number readSmalltalkSyntaxFrom:(ReadStream on:'+00000123.45')  

     Number readFrom:(ReadStream on:'+00000123.45')  

     |s|

     s := ReadStream on:'2.'.

     Number readSmalltalkSyntaxFrom:s.

     s next    

     |s|

     s := ReadStream on:'2.0.'.

     Number readSmalltalkSyntaxFrom:s.

     s next    

    "

    "Modified: / 19.11.1999 / 18:26:47 / cg"

! !

!Number class methodsFor:'constants'!

decimalPointCharacter 

    "printed"

    DecimalPointCharacter isNil ifTrue:[

        DecimalPointCharacter := $.

    ].

!

decimalPointCharacter:aCharacter 

    "printed"

    DecimalPointCharacter := aCharacter

    "

     1.5 printString

     Number decimalPointCharacter:$,.

     1.5 printString       

     Number decimalPointCharacter:$..

    "

!

decimalPointCharacters 

    "accepted when converting from a string"

    DecimalPointCharacters isNil ifTrue:[

        DecimalPointCharacters := #( $. )

    ].

    ^ DecimalPointCharacters

    "

     1.5 printString

     Number decimalPointCharacters:#( $. $,) .

     Number fromString:'1.5'.     

     Number fromString:'1,5'.     

     Number decimalPointCharacters:#( $. ).

    "

!

decimalPointCharacters:aCollectionOfCharacters 

    "accepted when converting from a string"

    DecimalPointCharacters := aCollectionOfCharacters

    "

     Number decimalPointCharacters:#( $. $,) .

     Number fromString:'1.5'.     

     Number fromString:'1,5'.     

     Number decimalPointCharacters:#( $. ).

    "

!

epsilon

     ^ self subclassResponsibility

! !

!Number class methodsFor:'error reporting'!

raise:aSignalSymbolOrErrorClass receiver:someNumber selector:sel arg:arg errorString:text 

    "ST-80 compatible signal raising. Provided for PD numeric classes"

    <context: #return>

    ^ self

        raise:aSignalSymbolOrErrorClass 

        receiver:someNumber 

        selector:sel 

        arguments:(Array with:arg)

        errorString:text 

    "

     Number 

        raise:#domainErrorSignal

        receiver:1.0

        selector:#sin

        arg:nil

        errorString:'foo bar test'

    "

    "Modified: / 16.11.2001 / 14:12:50 / cg"

!

raise:aSignalSymbolOrErrorClass receiver:someNumber selector:sel arguments:argArray errorString:text 

    "ST-80 compatible signal raising. Provided for PD numeric classes.

     aSignalSymbolOrErrorClass is either an Error-subclass, or

     the selector which is sent to myself, to retrieve the Exception class / Signal."

    <context: #return>

    |msg signalOrException|

    msg := MessageSend

                receiver:someNumber

                selector:sel

                arguments:argArray.

    aSignalSymbolOrErrorClass isSymbol ifTrue:[

        signalOrException := self perform:aSignalSymbolOrErrorClass.

    ] ifFalse:[

        signalOrException := aSignalSymbolOrErrorClass.    "/ assume its an Error-Subclass

    ].

    ^ signalOrException

         raiseRequestWith:msg 

         errorString:text 

         in:thisContext sender

    "

     Number 

        raise:#domainErrorSignal

        receiver:1.0

        selector:#foo 

        errorString:'foo bar test'

    "

    "Modified: / 16.11.2001 / 14:12:09 / cg"

!

raise:aSignalSymbolOrErrorClass receiver:someNumber selector:sel errorString:text 

    "ST-80 compatible signal raising. Provided for PD numeric classes.

     aSignalSymbolOrErrorClass is either an Error-subclass, or

     the selector which is sent to myself, to retrieve the Exception class / Signal."

    <context: #return>

    ^ self

        raise:aSignalSymbolOrErrorClass 

        receiver:someNumber 

        selector:sel 

        arguments:#()

        errorString:text 

    "

     Number 

        raise:#domainErrorSignal

        receiver:1.0

        selector:#foo 

        errorString:'foo bar test'

    "

    "Modified: / 16.11.2001 / 14:13:16 / cg"

! !

!Number class methodsFor:'private'!

readMantissaAndScaleFrom:aStream radix:radix

    "helper for readFrom: -

     return the mantissa (post-decimal-point digits) from the (character-)stream aStream;

     In addition, the scale (number of postDecimalPoint digits) is returned 

     (to support reading fixedPoint numbers).

     No whitespace is skipped.

     Errs if no number is available on aStream."

    |nextChar value factor intMantissa scale highPrecision|

    highPrecision := false.

    value := 0.0.

    factor := 1.0 asLongFloat / radix.

    scale := 0.

    intMantissa := 0.

    nextChar := aStream peekOrNil.

    [nextChar notNil and:[nextChar isDigitRadix:radix]] whileTrue:[

        value := value + (nextChar digitValue * factor).

        intMantissa := (intMantissa * radix) + nextChar digitValue.

        factor := factor / radix.

        scale := scale + 1.

        aStream next.

        nextChar := aStream peekOrNil

    ].

    ^ (Array with:value with:intMantissa with:scale).

    "

     Number readMantissaAndScaleFrom:'234'    readStream radix:10. 

     Number readMantissaAndScaleFrom:'2'      readStream radix:10. 

     Number readMantissaAndScaleFrom:'234567' readStream radix:10. 

     Number readMantissaAndScaleFrom:'234000' readStream radix:10. 

     Number readMantissaAndScaleFrom:'234'    readStream radix:10. 

     Number readMantissaAndScaleFrom:'12345678901234567890' readStream radix:10. 

    "

    "Modified: / 14.4.1998 / 18:47:47 / cg"

!

readMantissaFrom:aStream radix:radix

    "helper for readFrom: -

     return the mantissa (post-decimal-point digits)

     from the (character-)stream aStream;

     No whitespace is skipped.

     Errs if no number available."

    ^ (self readMantissaAndScaleFrom:aStream radix:radix) first

    "

     Number readMantissaFrom:'234'    readStream radix:10.

     Number readMantissaFrom:'2'      readStream radix:10.

     Number readMantissaFrom:'234567' readStream radix:10.

    "

    "Modified: / 14.4.1998 / 18:47:47 / cg"

! !

!Number methodsFor:'Compatibility-Squeak'!

asSmallAngleDegrees

    "Return the receiver normalized to lie within the range (-180, 180)"

    | pos |

    pos := self \\ 360.

    pos > 180 ifTrue: [pos := pos - 360].

    ^ pos

    "

     #(-500 -300 -150 -5 0 5 150 300 500 1200) 

        collect: [:n | n asSmallAngleDegrees]

    "