 digits_   = "." ([0-9])*         => [[ second >digits ]]
 digits    = (digits_)?           => [[ 6 or ]]
 
-fmt-%     = "%"                  => [[ [ "%" ] ]]
+fmt-%     = "%"                  => [[ "%" ]]
 fmt-c     = "c"                  => [[ [ 1string ] ]]
 fmt-C     = "C"                  => [[ [ 1string >upper ] ]]
 fmt-s     = "s"                  => [[ [ present ] ]]

! Copyright (C) 2008 John Benediktsson
! See http://factorcode.org/license.txt for BSD license
USING: accessors arrays assocs calendar combinators fry kernel
generalizations io io.streams.string macros math math.functions
math.parser peg.ebnf prettyprint quotations sequences splitting
strings unicode.categories unicode.case vectors combinators.smart
present ;
FROM: math.parser.private => format-float ;
IN: formatting



assocs    = "[%" types ": %" types " %]" => [[ [ second ] [ fourth ] bi '[ unzip [ _ map ] dip _ map zip [ ":" join ] map ", " join "{ " prepend " }" append ] ]]

formats   = "%" (types|fmt-%|lists|assocs|unknown) => [[ second ]]

plain-text = (!("%").)+          => [[ >string ]]

text      = (formats|plain-text)* => [[ ]]

;EBNF

PRIVATE>

MACRO: printf ( format-string -- )
    parse-printf [ [ callable? ] count ] keep [
        dup string? [ 1quotation ] [ [ 1 - ] dip ] if
        over [ ndip ] 2curry
    ] map nip [ compose-all ] [ length ] bi '[
        @ output-stream get [ stream-write ] curry _ napply
    ] ;

: sprintf ( format-string -- result )
    [ printf ] with-string-writer ; inline

: vprintf ( seq format-string -- )
    parse-printf output-stream get '[
        dup string? [
            [ unclip-slice ] dip call( x -- y )
        ] unless _ stream-write
    ] each drop ;

: vsprintf ( seq format-string -- result )
    [ vprintf ] with-string-writer ; inline
