! Copyright (C) 2009 Daniel Ehrenberg
! See http://factorcode.org/license.txt for BSD license.
-USING: combinators kernel sequences math arrays locals fry accessors
-lists splitting make combinators.short-circuit namespaces
-grouping splitting.monotonic ;
+USING: accessors arrays combinators combinators.short-circuit
+fry kernel lists locals math sequences typed ;
IN: wrap
! black is the text length, white is the whitespace length
TUPLE: element contents black white ;
C: <element> element
-: element-length ( element -- n )
+<PRIVATE
+
+TYPED: element-length ( element: element -- n )
[ black>> ] [ white>> ] bi + ;
TUPLE: paragraph line-max line-ideal lines head-width tail-cost ;
C: <paragraph> paragraph
-: top-fits? ( paragraph -- ? )
+TYPED: top-fits? ( paragraph: paragraph -- ? )
[ head-width>> ]
[ dup lines>> 1list? [ line-ideal>> ] [ line-max>> ] if ] bi <= ;
-: fits? ( paragraph -- ? )
+TYPED: fits? ( paragraph: paragraph -- ? )
! Make this not count spaces at end
{ [ lines>> car 1list? ] [ top-fits? ] } 1|| ;
:: min-by ( seq quot -- elt )
- f 1/0. seq [| key value new |
- new quot call :> newvalue
- newvalue value < [ new newvalue ] [ key value ] if
+ f 1/0. seq [| key value newkey |
+ newkey quot call :> newvalue
+ newvalue value < [ newkey newvalue ] [ key value ] if
] each drop ; inline
-: paragraph-cost ( paragraph -- cost )
+TYPED: paragraph-cost ( paragraph: paragraph -- cost )
dup lines>> 1list? [ drop 0 ] [
[ [ head-width>> ] [ line-ideal>> ] bi - sq ]
[ tail-cost>> ] bi +
[ drop paragraph-cost ]
} 2cleave <paragraph> ;
-: glue ( paragraph element -- paragraph )
- {
- [ drop [ line-max>> ] [ line-ideal>> ] bi ]
- [ [ lines>> unswons ] dip swons swons ]
- [ [ head-width>> ] [ element-length ] bi* + ]
- [ drop tail-cost>> ]
- } 2cleave <paragraph> ;
+TYPED: add-element ( paragraph: paragraph element: element -- )
+ [ element-length [ + ] curry change-head-width ]
+ [ [ [ unswons ] dip swons swons ] curry change-lines ]
+ bi drop ;
: wrap-step ( paragraphs element -- paragraphs )
- [ '[ _ glue ] map ]
[ [ min-cost ] dip new-line ]
- 2bi prefix
+ [ dupd '[ _ add-element ] each ]
+ 2bi swap prefix
[ fits? ] filter ;
: 1paragraph ( line-max line-ideal element -- paragraph )
lines>> [ [ contents>> ] lmap>array ] lmap>array ;
: initialize ( line-max line-ideal elements -- elements paragraph )
- <reversed> unclip-slice [ -rot ] dip 1paragraph 1array ;
+ reverse unclip [ -rot ] dip 1paragraph 1array ;
+
+PRIVATE>
-: wrap ( elements line-max line-ideal -- paragraph )
+: wrap ( elements line-max line-ideal -- array )
rot [ 2drop { } ] [
initialize
[ wrap-step ] reduce