TUPLE: paragraph line-max line-ideal lines head-width tail-cost ;
C: <paragraph> paragraph
+: if-one-line ( paragraph true false -- )
+ [ dup lines>> 1list? ] 2dip if ; inline
+
TYPED: top-fits? ( paragraph: paragraph -- ? )
[ head-width>> ]
- [ dup lines>> 1list? [ line-ideal>> ] [ line-max>> ] if ] bi <= ; inline
+ [ [ line-ideal>> ] [ line-max>> ] if-one-line ] bi <= ; inline
TYPED: fits? ( paragraph: paragraph -- ? )
! Make this not count spaces at end
{ [ lines>> car 1list? ] [ top-fits? ] } 1|| ; inline
TYPED: paragraph-cost ( paragraph: paragraph -- cost )
- dup lines>> 1list? [ drop 0 ] [
- [ [ head-width>> ] [ line-ideal>> ] bi - sq ]
- [ tail-cost>> ] bi +
- ] if ; inline
+ [ drop 0 ] [
+ [ head-width>> ] [ line-ideal>> - sq ] [ tail-cost>> ] tri +
+ ] if-one-line ; inline
: min-cost ( paragraphs -- paragraph )
[ paragraph-cost ] infimum-by ; inline
} 2cleave <paragraph> ; inline
TYPED: add-element ( paragraph: paragraph element: element -- )
- [ element-length [ + ] curry change-head-width ]
- [ [ [ unswons ] dip swons swons ] curry change-lines ]
- bi drop ; inline
+ [ '[ _ element-length + ] change-head-width ]
+ [ '[ unswons _ swons swons ] change-lines ] bi drop ; inline
TYPED: wrap-step ( paragraphs: array element: element -- paragraphs )
[ [ min-cost ] dip new-line ]
[ dupd '[ _ add-element ] each ]
2bi swap prefix { array } declare
- [ fits? ] filter ;
+ [ fits? ] filter ; inline
: 1paragraph ( line-max line-ideal element -- paragraph )
[ 1list 1list ] [ black>> ] bi 0 <paragraph> ;
: post-process ( paragraph -- array )
lines>> [ [ contents>> ] lmap>array ] lmap>array ;
-: initialize ( line-max line-ideal elements -- elements paragraph )
+: initial-step ( line-max line-ideal elements -- elements paragraph )
reverse unclip [ -rot ] dip 1paragraph 1array ;
PRIVATE>
: wrap ( elements line-max line-ideal -- array )
rot [ 2drop { } ] [
- initialize
+ initial-step
[ wrap-step ] reduce
min-cost
post-process