 ! Copyright (C) 2007 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: accessors arrays assocs combinators.smart effects
-effects.parser fry generalizations grouping kernel lexer macros
-math math.order math.vectors namespaces parser quotations
-sequences sequences.private splitting.monotonic stack-checker
-strings unicode words ;
+USING: accessors combinators.smart effects.parser fry
+generalizations grouping kernel lexer macros math math.order
+parser quotations sequences splitting.monotonic strings unicode
+words ;
 IN: roman
 
 <PRIVATE

: roman-digit-index ( ch -- n )
    1string roman-digits index ; inline

: roman>= ( ch1 ch2 -- ? )
    [ roman-digit-index ] bi@ >= ;

: roman>n ( ch -- n )
    roman-digit-index roman-values nth ;

: (roman>) ( seq -- n )
    [ [ roman>n ] map ] [ all-eq? ] bi
    [ sum ] [ first2 swap - ] if ;

PRIVATE>

: >ROMAN ( n -- str ) >roman >upper ;

: roman> ( str -- n )
    >lower [ roman-digit>= ] monotonic-split
    [ roman-value ] map-sum ;

<PRIVATE

