"

 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:'DecimalPointCharacterForPrinting DecimalPointCharactersForReading'

	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

    [class variables:]

        DecimalPointCharacterForPrinting          <Character>                     used when printing

        DecimalPointCharactersForReading          <Collection of Character>       accepted as decimalPointChars when reading

    [author:]

        Claus Gittinger

    [see also:]

        Integer LargeInteger SmallInteger

        LimitedPrecisionReal Float ShortFloat

        Fraction FixedPoint

"

! !

!Number class methodsFor:'instance creation'!

fastFromString:aString

    "return the next Float, Integer or ShortFloat from the string.

     No spaces are skipped.

     This is a specially tuned entry (using a low-level C-call), which

     returns garbage if the argument string is not a valid float number.

     It has been added to allow high speed string decomposition into numbers,

     especially for mass-data."

    ^ self fastFromString:aString at:1

    "

     Float fromString:'12345.0'

     Float fastFromString:'12345.0'

     Integer fromString:'12345'

     Integer fastFromString:'12345'

     should be roughly 10times faster than the general method:

     Time millisecondsToRun:[

        100000 timesRepeat:[ Float fromString:'12345.0' ]

     ].   

     Time millisecondsToRun:[

        100000 timesRepeat:[ Float fastFromString:'12345.0' ]

     ].   

     Time millisecondsToRun:[

        100000 timesRepeat:[ Integer fromString:'12345' ]

     ].  

     Time millisecondsToRun:[

        100000 timesRepeat:[ Integer fastFromString:'12345' ]

     ]. 

    "

!

fromString:aString

    "return a number by reading from aString.

     In contrast to readFrom:, no garbage is allowed after the number.

     I.e. the string must contain exactly one valid number (with optional separators around)"

    ^ self

        fromString:aString

        decimalPointCharacters:(self decimalPointCharactersForReading) 

    "

     Number fromString:'12345'

     Number fromString:'abc'

     Number fromString:'1abc'   -> raises an error

     Number readFrom:'1abc'     -> reads a 1    

     Number readFrom:'10/2'     -> reads a 10   

     Number fromString:'10/2'   -> raises an error   

     Number fromString:'(1/2)'  -> reads a fraction   

     Number readFrom:'(1/2)'    -> reads a fraction   

     Number readFrom:'(10/2)'   -> reads a 5   

     '12345' asNumber

    "

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

!

fromString:aString decimalPointCharacters:decimalPointCharacters

    "return a number by reading from aString.

     In contrast to readFrom:, no garbage is allowed after the number.

     I.e. the string must contain exactly one valid number (with optional separators around)"

    |s num|

    s := aString readStream.

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

    s atEnd ifFalse:[

        s skipSeparators.

        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 decimalPointCharacters:decimalPointCharacters onError:exceptionBlock

    "return a number by reading from aString.

     In contrast to readFrom:, no garbage is allowed after the number.

     I.e. the string must contain exactly one valid number (with optional separators around)"

    ^ self readFrom:aString decimalPointCharacters:decimalPointCharacters onError:exceptionBlock

    "

     Number fromString:'12345' onError:0

     Number fromString:'fooBarBaz' onError:0

    "

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

!

fromString:aString onError:exceptionBlock

    "return a number by reading from aString.

     In contrast to readFrom:, no garbage is allowed after the number.

     I.e. the string must contain exactly one valid number (with optional separators around)"

    ^ 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 decimalPointCharacters:decimalPointCharacters 

    "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.

     It also allows garbage after the number - i.e. it reads what it can.

     See #fromString: , which is more strict and does not allow garbage at the end."

    ^ self

        readFrom:aStringOrStream 

        decimalPointCharacters:decimalPointCharacters 

        onError:[self error:'conversion error for: ' , self name]

    "

     Number readFrom:'123.456' decimalPointCharacters:'.'      

     Number readFrom:'123,456' decimalPointCharacters:'.,'     

     Number readFrom:'123,456' decimalPointCharacters:'.'     

    "

!

readFrom:aStringOrStream decimalPointCharacters:decimalPointCharacters 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.

     It also allows garbage after the number - i.e. it reads what it can.

     See #fromString: , which is more strict and does not allow garbage at the end."

    ^ [

        |value intValue mantissaAndScale scale decimalMantissa str 

         nextChar radix sign signExp exp numerator denom|

        str := aStringOrStream readStream.

        nextChar := str skipSeparators.

        nextChar isNil ifTrue:[^ exceptionBlock value].

        (nextChar == $-) ifTrue:[

            sign := -1.

            str next.

            nextChar := str peekOrNil

        ] ifFalse:[

            sign := 1.

            (nextChar == $+) ifTrue:[

                str next.

                nextChar := str peekOrNil

            ]

        ].

        nextChar = $( ifTrue:[

            "maybe a Fraction e.g. (1/3)"

            str next.

            numerator := Integer readFrom:str onError:[^ exceptionBlock value].

            str skipSeparators.

            nextChar := str peekOrNil.

            nextChar = $/ ifTrue:[

                str next.

                denom := Integer readFrom:str onError:[^ exceptionBlock value].

                str skipSeparators.

                nextChar := str peekOrNil.

            ].

            nextChar = $) ifFalse:[^ exceptionBlock value].

            str next.

            value := Fraction numerator:numerator denominator:denom.

            ^ value * sign

        ].

        nextChar isNil ifTrue:[^ exceptionBlock value].    

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

            ^ exceptionBlock value.

"/          value := super readFrom:str.

"/          sign == -1 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.

        ].

        (self == Integer or:[self inheritsFrom:Integer]) ifFalse:[

            (decimalPointCharacters includes:nextChar) ifTrue:[

                str next.

                nextChar := str peekOrNil.

                decimalMantissa := 0.

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

                    |mantissa|

                    mantissaAndScale := self readMantissaAndScaleFrom:str radix:radix.

                    mantissa := mantissaAndScale first.

                    value := (mantissa coerce:value) + mantissa.

                    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:[

                ('sS' includes:nextChar) ifTrue:[

                    str next.

                    nextChar := str peekOrNil.

                    (nextChar notNil and:[ nextChar isDigit]) ifTrue:[

                        scale := (Integer readFrom:str).

                    ].

                    mantissaAndScale isNil ifTrue:[

                        value := intValue asFixedPoint:(scale ? 0).

                    ] ifFalse:[

                        denom := 10 raisedTo:mantissaAndScale last.

                        value := FixedPoint 

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

                                    denominator:denom

                                    scale:(scale ? mantissaAndScale third).

                    ].

                ] ifFalse:[

                    (self inheritsFrom:LimitedPrecisionReal) ifTrue:[

                        "when requesting a specific Float instance, coerce it.

                         otherwise return a value without loosing precision"

                        value := self coerce:value.

                    ].

                ].

            ].

        ].

        sign == -1 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:'(1/3)'      

     Number readFrom:'(-1/3)'      

     Number readFrom:'(1/-3)'      

     Number readFrom:'-(1/3)'      

     Number readFrom:'-(-1/3)'      

     Number readFrom:'(-1/3'      

     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'      

     LongFloat readFrom:'.00000001'      

     Number readFrom:'.00000000000001'      

     Number readFrom:'.001'      

     ShortFloat readFrom:'.001'      

     Number readFrom:'123garbage'      -> returns 123

     Number fromString:'123garbage'    -> raises an error  

     DecimalPointCharactersForReading := #( $. $, ).   

     Number readFrom:'99,00'      

     DecimalPointCharactersForReading := #( $. ).   

     Number readFrom:'99,00'      

    "

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

     It also allows garbage after the number - i.e. it reads what it can.

     See #fromString: , which is more strict and does not allow garbage at the end."

    ^ self 

        readFrom:aStringOrStream 

        decimalPointCharacters:(self decimalPointCharactersForReading) 

        onError: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'      

     DecimalPointCharactersForReading := #( $. $, ).   

     Number readFrom:'99,00'      

     DecimalPointCharactersForReading := #( $. ).   

     Number readFrom:'99,00'      

    "

!

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."

    ^ self readSmalltalkSyntaxFrom:aStream onError:nil.

    "

     Number readSmalltalkSyntaxFrom:'99d'    

     Number readSmalltalkSyntaxFrom:'99.00d'    

     Number readSmalltalkSyntaxFrom:'54.32e-01'    

     Number readSmalltalkSyntaxFrom:'12345678901234567890'

     Number readSmalltalkSyntaxFrom:'16rAAAAFFFFAAAAFFFF'   

     Number readSmalltalkSyntaxFrom:'foobar'     

     Number readSmalltalkSyntaxFrom:'(1/10)' 

     Number readSmalltalkSyntaxFrom:'(1/0)' 

     Number readFrom:'(1/3)' 

     Number readFrom:'(-1/3)'

     Number readFrom:'-(1/3)' 

     Number readFrom:'(1/-3)' 

     Number readFrom:'(-1/-3)' 

     Number readFrom:'-(-1/-3)'   

     Number readSmalltalkSyntaxFrom:'+00000123.45'  

     Number readFrom:'+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"

!

readSmalltalkSyntaxFrom:aStream onError:errorValue

    "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."

    |n|

    [

        n := Scanner scanNumberFrom:aStream.

    ] on:Error do:[:ex|

        n := nil

    ].

    n isNil ifTrue:[^ errorValue value].

    ^ n

    "

     Number readSmalltalkSyntaxFrom:'foo' onError:123   

    "

! !