163 lines
3.6 KiB
Factor
Executable File
163 lines
3.6 KiB
Factor
Executable File
! Copyright (C) 2004, 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel math.private namespaces sequences strings
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arrays combinators splitting math assocs make ;
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IN: math.parser
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: digit> ( ch -- n )
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H{
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{ CHAR: 0 0 }
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{ CHAR: 1 1 }
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{ CHAR: 2 2 }
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{ CHAR: 3 3 }
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{ CHAR: 4 4 }
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{ CHAR: 5 5 }
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{ CHAR: 6 6 }
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{ CHAR: 7 7 }
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{ CHAR: 8 8 }
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{ CHAR: 9 9 }
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{ CHAR: A 10 }
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{ CHAR: B 11 }
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{ CHAR: C 12 }
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{ CHAR: D 13 }
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{ CHAR: E 14 }
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{ CHAR: F 15 }
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{ CHAR: a 10 }
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{ CHAR: b 11 }
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{ CHAR: c 12 }
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{ CHAR: d 13 }
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{ CHAR: e 14 }
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{ CHAR: f 15 }
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} at ;
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: string>digits ( str -- digits )
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[ digit> ] { } map-as ;
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: digits>integer ( seq radix -- n )
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0 swap [ swapd * + ] curry reduce ;
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DEFER: base>
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<PRIVATE
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SYMBOL: radix
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SYMBOL: negative?
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: sign ( -- str ) negative? get "-" "+" ? ;
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: with-radix ( radix quot -- )
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radix swap with-variable ; inline
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: (base>) ( str -- n ) radix get base> ;
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: whole-part ( str -- m n )
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sign split1 >r (base>) r>
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dup [ (base>) ] [ drop 0 swap ] if ;
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: string>ratio ( str -- a/b )
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"-" ?head dup negative? set swap
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"/" split1 (base>) >r whole-part r>
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3dup and and [ / + swap [ neg ] when ] [ 2drop 2drop f ] if ;
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: valid-digits? ( seq -- ? )
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{
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{ [ dup empty? ] [ drop f ] }
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{ [ f over memq? ] [ drop f ] }
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[ radix get [ < ] curry all? ]
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} cond ;
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: string>integer ( str -- n/f )
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"-" ?head swap
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string>digits dup valid-digits?
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[ radix get digits>integer swap [ neg ] when ] [ 2drop f ] if ;
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PRIVATE>
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: base> ( str radix -- n/f )
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[
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CHAR: / over member? [
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string>ratio
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] [
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CHAR: . over member? [
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string>float
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] [
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string>integer
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] if
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] if
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] with-radix ;
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: string>number ( str -- n/f ) 10 base> ;
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: bin> ( str -- n/f ) 2 base> ;
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: oct> ( str -- n/f ) 8 base> ;
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: hex> ( str -- n/f ) 16 base> ;
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: >digit ( n -- ch )
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dup 10 < [ CHAR: 0 + ] [ 10 - CHAR: a + ] if ;
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: positive>base ( num radix -- str )
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dup 1 <= [ "Invalid radix" throw ] when
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[ dup 0 > ] swap [ /mod >digit ] curry [ ] "" produce-as nip
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dup reverse-here ; inline
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PRIVATE>
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GENERIC# >base 1 ( n radix -- str )
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<PRIVATE
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: (>base) ( n -- str ) radix get >base ;
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PRIVATE>
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M: integer >base
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over 0 = [
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2drop "0"
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] [
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over 0 > [
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positive>base
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] [
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[ neg ] dip positive>base CHAR: - prefix
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] if
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] if ;
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M: ratio >base
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[
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dup 0 < negative? set
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1 /mod
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[ dup zero? [ drop "" ] [ (>base) sign append ] if ]
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[
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[ numerator (>base) ]
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[ denominator (>base) ] bi
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"/" swap 3append
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] bi* append
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negative? get [ CHAR: - prefix ] when
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] with-radix ;
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: fix-float ( str -- newstr )
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{
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{
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[ CHAR: e over member? ]
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[ "e" split1 >r fix-float "e" r> 3append ]
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} {
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[ CHAR: . over member? ]
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[ ]
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}
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[ ".0" append ]
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} cond ;
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M: float >base
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drop {
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{ [ dup fp-nan? ] [ drop "0.0/0.0" ] }
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{ [ dup 1.0/0.0 = ] [ drop "1.0/0.0" ] }
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{ [ dup -1.0/0.0 = ] [ drop "-1.0/0.0" ] }
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{ [ dup double>bits HEX: 8000000000000000 = ] [ drop "-0.0" ] }
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[ float>string fix-float ]
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} cond ;
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: number>string ( n -- str ) 10 >base ;
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: >bin ( n -- str ) 2 >base ;
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: >oct ( n -- str ) 8 >base ;
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: >hex ( n -- str ) 16 >base ;
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: # ( n -- ) number>string % ;
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