Category talk:Factor-numspec
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Source code
<lang factor>USING: ascii assocs kernel lexer lists lists.lazy math math.functions math.parser namespaces pair-rocket parser sequences words.constant ; IN: numspec
SYMBOL: digits
H{
CHAR: E => L{ 0 2 4 6 8 } CHAR: e => L{ 2 4 6 8 } CHAR: f => L{ 2 4 6 } CHAR: o => L{ 1 3 5 7 9 } CHAR: s => L{ 1 2 3 4 5 6 7 8 9 } CHAR: p => L{ 2 3 5 7 } CHAR: q => L{ 1 3 7 9 } CHAR: r => L{ 3 5 7 } CHAR: _ => L{ 0 1 2 3 4 5 6 7 8 9 }
}
digits set-global
<PRIVATE
- digits>number ( {5,2,4} -- 524 )
<reversed> 0 [ 10^ * + ] reduce-index ;
- parse-digit ( n -- list )
dup digit? [ digit> 1list ] [ digits get at ] if ;
- (parse-digits-spec) ( str -- list-of-lists )
[ parse-digit ] { } map-as >list ;
- parse-digits-spec ( str -- list-of-lists )
dup length 1 = [ CHAR: 0 prefix ] when (parse-digits-spec) ;
- (parse-numspec) ( seq -- list-of-lists-of-lists )
[ parse-digits-spec ] map >list ;
- extrapolate ( list -- list' )
uncons uncons dupd cons cons cons ;
- >infinite ( list -- list' ) [ extrapolate ] lfrom-by ;
- infinitize ( seq -- list )
but-last unclip-last [ (parse-numspec) ] [ parse-digits-spec >infinite ] bi* lappend-lazy ;
- parse-numspec ( seq -- list-of-lists-of-lists )
dup last "..." = [ infinitize ] [ (parse-numspec) ] if ;
PRIVATE>
- numspec ( seq -- list )
parse-numspec [ lcartesian-product* ] lmap-lazy lconcat [ digits>number ] lmap-lazy ;
SYNTAX: NUMSPEC:
scan-new-word ";" parse-tokens numspec define-constant ;
SYNTAX: DIGIT:
scan-token scan-token [ first ] [ [ digit> ] { } map-as >list ] bi* swap digits get set-at ;</lang>