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232 lines
13 KiB
Racket
232 lines
13 KiB
Racket
#lang typed/racket/base
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(require racket/list math/flonum)
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(require/typed sugar/list [slice-at ((Listof Quad) Positive-Integer . -> . (Listof (Listof Quad)))])
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(require "quads-typed.rkt" "utils-typed.rkt" "wrap-typed.rkt" "measure-typed.rkt" "world-typed.rkt" "logger-typed.rkt")
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(define-type Block-Type (Listof Quad))
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(define-type Multicolumn-Type (Listof Block-Type))
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(define-type Multipage-Type (Listof Multicolumn-Type))
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(define/typed (cons-reverse xs ys)
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(All (A B) ((Listof A) (Listof B) -> (Pairof (Listof A) (Listof B))))
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((inst cons (Listof A) (Listof B)) ((inst reverse A) xs) ys))
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(define/typed+provide (input->nested-blocks i)
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(Quad . -> . (Listof Multipage-Type))
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(define-values (mps mcs bs b)
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(for/fold ([multipages : (Listof Multipage-Type) empty]
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[multicolumns : (Listof Multicolumn-Type) empty]
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[blocks : (Listof Block-Type) empty]
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[block-acc : Block-Type empty])
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([q (in-list (split-quad i))])
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(cond
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[(page-break? q) (values (cons-reverse (cons-reverse (cons-reverse block-acc blocks) multicolumns) multipages) empty empty empty)]
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[(column-break? q) (values multipages (cons-reverse (cons-reverse block-acc blocks) multicolumns) empty empty)]
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[(block-break? q) (values multipages multicolumns (cons-reverse block-acc blocks) empty)]
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[else (values multipages multicolumns blocks (cons q block-acc))])))
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(reverse (cons-reverse (cons-reverse ((inst cons-reverse Quad Block-Type) b bs) mcs) mps)))
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(define/typed+provide (merge-adjacent-within q)
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(Quad . -> . Quad)
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(quad (quad-name q) (quad-attrs q) (join-quads (cast (quad-list q) (Listof Quad)))))
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(define/typed+provide (hyphenate-quad-except-last-word q)
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(Quad . -> . Quad)
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(log-quad-debug "last word will not be hyphenated")
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(define-values (first-quads last-quad) ((inst split-last QuadListItem) (quad-list q)))
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(quad (quad-name q) (quad-attrs q) (snoc ((inst map QuadListItem QuadListItem) hyphenate-quad first-quads) last-quad)))
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(define/typed+provide (average-looseness lines)
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((Listof Quad) . -> . Flonum)
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(if (<= (length lines) 1)
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0.0
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(let ([lines-to-measure (drop-right lines 1)]) ; exclude last line from looseness calculation
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(round-float (/ (foldl fl+ 0.0 ((inst map Flonum Quad) (λ(line) (cast (quad-attr-ref line world:line-looseness-key 0.0) Flonum)) lines-to-measure)) (- (fl (length lines)) 1.0))))))
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(define/typed+provide (log-debug-lines lines)
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((Listof Quad) . -> . (Listof String))
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(log-quad-debug "line report:")
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(for/list : (Listof String) ([(line idx) (in-indexed lines)])
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(format "~a/~a: ~v ~a" idx
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(length lines)
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(quad->string line)
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(quad-attr-ref line world:line-looseness-key))))
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(define/typed+provide (block->lines b)
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(Quad . -> . (Listof Quad)) ;; todo: introduce a Quad subtype where quad-list is guaranteed to be all Quads (no strings)
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(define quality (cast (quad-attr-ref/parameter b world:quality-key) Real))
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(define/typed (wrap-quads qs)
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((Listof Quad) . -> . (Listof Quad))
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(define wrap-proc (cond
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[(>= quality world:max-quality) wrap-best]
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[(<= quality world:draft-quality) wrap-first]
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[else wrap-adaptive]))
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(wrap-proc qs))
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(log-quad-debug "wrapping lines")
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(log-quad-debug "quality = ~a" quality)
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(log-quad-debug "looseness tolerance = ~a" world:line-looseness-tolerance)
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(define wrapped-lines-without-hyphens (wrap-quads (cast (quad-list b) (Listof Quad)))) ; 100/150
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(log-quad-debug* (log-debug-lines wrapped-lines-without-hyphens))
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(define avg-looseness (average-looseness wrapped-lines-without-hyphens))
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(define gets-hyphenation? (and world:use-hyphenation?
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(fl> avg-looseness world:line-looseness-tolerance)))
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(log-quad-debug "average looseness = ~a" avg-looseness)
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(log-quad-debug (if gets-hyphenation? "hyphenating" "no hyphenation needed"))
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(define wrapped-lines (if gets-hyphenation?
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(wrap-quads (split-quad (cast ((if world:allow-hyphenated-last-word-in-paragraph
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hyphenate-quad
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hyphenate-quad-except-last-word) (merge-adjacent-within b)) Quad)))
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wrapped-lines-without-hyphens))
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(when gets-hyphenation? (log-quad-debug* (log-debug-lines wrapped-lines)))
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(log-quad-debug "final looseness = ~a" (average-looseness wrapped-lines))
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(map insert-spacers-in-line
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(for/list : (Listof Quad) ([line-idx (in-naturals)][line (in-list wrapped-lines)])
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(quad-attr-set* line 'line-idx line-idx 'lines (length wrapped-lines)))))
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(define/typed+provide (number-pages ps)
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((Listof Quad) . -> . (Listof Quad))
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(for/list ([i (in-naturals)][p (in-list ps)])
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(quad (quad-name p) (merge-attrs (quad-attrs p) `(page ,i)) (quad-list p))))
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(define/typed+provide (pages->doc ps)
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((Listof Quad) . -> . Quad)
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;; todo: resolve xrefs and other last-minute tasks
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;; todo: generalize computation of widths and heights, recursively
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(define (columns-mapper page)
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(quad-map (compose1 add-vert-positions (λ(xs) (quad-map (λ(x) (compute-line-height (add-horiz-positions (fill (cast x Quad))))) (cast xs Quad)))) (cast page Quad)))
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(define mapped-pages (map columns-mapper (number-pages ps)))
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(define doc (quads->doc mapped-pages))
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doc)
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(require racket/class)
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(require/typed csp
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[problem% (Class (init-field)
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(reset (-> Void))
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(get-solution (-> HashTableTop))
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(get-solutions (-> (Listof (HashTable String Integer))))
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(add-variable (Any (Listof Any) . -> . Void))
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(add-constraint (Procedure (Listof Any) . -> . Void)))])
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(define/typed+provide (lines->columns lines)
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((Listof Quad) . -> . (Listof Quad)) ; (lines? . -> . columns?)
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(define prob (new problem%))
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(define max-column-lines world:default-lines-per-column)
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(define-values (columns ignored-return-value)
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(for/fold ([columns : (Listof Quad) empty][lines-remaining : (Listof Quad) lines])
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([col-idx : Nonnegative-Integer (stop-before (in-naturals) (λ(x) (empty? lines-remaining)))])
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(log-quad-info "making column ~a" (add1 col-idx))
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;; domain constraint is best way to simplify csp, because it limits the search space.
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;; search from largest possible value to smallest.
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;; largest possible is the minimum of the max column lines, or
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;; the number of lines left (modulo minimum page lines) ...
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(define viable-column-range
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(range (min max-column-lines (max
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(length lines-remaining)
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(- (length lines-remaining) world:minimum-lines-per-column)))
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;; ... and the smallest possible is 1, or the current minimum lines.
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;; (sub1 insures that range is inclusive of last value.)
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(sub1 (min 1 world:minimum-lines-per-column)) -1))
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(log-quad-debug "viable number of lines for this column to start =\n~a" viable-column-range)
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(send prob add-variable "column-lines" viable-column-range)
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;; greediness constraint: leave enough lines for next page, or take all
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(define/typed (greediness-constraint pl)
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(Index . -> . Boolean)
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(define leftover (- (length lines-remaining) pl))
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(or (= leftover 0) (>= leftover world:minimum-lines-per-column)))
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(send prob add-constraint greediness-constraint '("column-lines"))
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(log-quad-debug "viable number of lines after greediness constraint =\n~a" ((inst map Integer (HashTable String Integer)) (λ(x) (hash-ref x "column-lines")) (send prob get-solutions)))
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;; last lines constraint: don't take page that will end with too few lines of last paragraph.
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(define/typed (last-lines-constraint pl)
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(Index . -> . Boolean)
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(define last-line-of-page ((inst list-ref Quad) lines-remaining (sub1 pl)))
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(define lines-in-this-paragraph (cast (quad-attr-ref last-line-of-page world:total-lines-key) Index))
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(define line-index-of-last-line (cast (quad-attr-ref last-line-of-page world:line-index-key) Index))
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(define (paragraph-too-short-to-meet-constraint?)
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(< lines-in-this-paragraph world:min-last-lines))
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(or (paragraph-too-short-to-meet-constraint?)
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(>= (add1 line-index-of-last-line) world:min-last-lines)))
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(send prob add-constraint last-lines-constraint '("column-lines"))
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(log-quad-debug "viable number of lines after last-lines constraint =\n~a" ((inst map Integer (HashTable String Integer)) (λ(x) (hash-ref x "column-lines")) (send prob get-solutions)))
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;; first lines constraint: don't take page that will leave too few lines at top of next page
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(define/typed (first-lines-constraint pl lines-remaining)
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(Index (Listof Quad) . -> . Boolean)
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(define last-line-of-page (list-ref lines-remaining (sub1 pl)))
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(define lines-in-this-paragraph (cast (quad-attr-ref last-line-of-page world:total-lines-key) Integer))
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(define line-index-of-last-line (cast (quad-attr-ref last-line-of-page world:line-index-key) Integer))
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(define lines-that-will-remain (- lines-in-this-paragraph (add1 line-index-of-last-line)))
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(define (paragraph-too-short-to-meet-constraint?)
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(< lines-in-this-paragraph world:min-first-lines))
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(or (paragraph-too-short-to-meet-constraint?)
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(= 0 lines-that-will-remain) ; ok to use all lines ...
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(>= lines-that-will-remain world:min-first-lines))) ; but if any remain, must be minimum number.
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(send prob add-constraint (λ(x) (first-lines-constraint (cast x Index) lines-remaining)) '("column-lines"))
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(log-quad-debug "viable number of lines after first-lines constraint =\n~a" ((inst map Integer (HashTable String Integer)) (λ(x) (hash-ref x "column-lines")) (send prob get-solutions)))
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(define s (send prob get-solution))
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(define how-many-lines-to-take (cast (hash-ref s "column-lines") Positive-Index))
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(define-values (lines-to-take lines-to-leave) (split-at lines-remaining how-many-lines-to-take))
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(log-quad-debug "taking ~a lines for column ~a:" how-many-lines-to-take (add1 col-idx))
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(map (λ([idx : Number] [line : Quad]) (log-quad-debug "~a:~a ~v" (add1 col-idx) (add1 idx) (quad->string line))) (range how-many-lines-to-take) lines-to-take)
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(send prob reset)
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(values (cons (quad-attr-set (quads->column lines-to-take) world:column-index-key col-idx) columns) lines-to-leave)))
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(reverse columns))
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(define/typed+provide (columns->pages cols)
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((Listof Quad) . -> . (Listof Quad)) ; (columns? . -> . pages?)
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(define columns-per-page (cast (quad-attr-ref/parameter (car cols) world:column-count-key) Positive-Integer))
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(define column-gutter (cast (quad-attr-ref/parameter (car cols) world:column-gutter-key) Flonum))
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;; don't use default value here. If the col doesn't have a measure key,
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;; it deserves to be an error, because that means the line was composed incorrectly.
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(when (not (quad-has-attr? (car cols) world:measure-key))
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(error 'columns->pages "column attrs contain no measure key: ~a ~a" (quad-attrs (car cols)) (quad-car (car cols))))
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(define column-width (cast (quad-attr-ref (car cols) world:measure-key) Flonum))
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(define width-of-printed-area (+ (* columns-per-page column-width) (* (sub1 columns-per-page) column-gutter)))
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(define result-pages
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((inst map Quad (Listof Quad)) (λ(cols) (quads->page cols))
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(for/list : (Listof (Listof Quad)) ([page-cols (in-list (slice-at cols columns-per-page))])
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(define-values (last-x cols)
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(for/fold ([current-x : Flonum (/ (- (world:paper-width-default) width-of-printed-area) 2.0)]
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[cols : (Listof Quad) empty])
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([col (in-list page-cols)][idx (in-naturals)])
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(values (+ current-x column-width column-gutter) (cons (cast (quad-attr-set* col 'x current-x 'y 40 world:column-index-key idx) Quad) cols))))
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(reverse cols))))
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result-pages)
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(define current-eof (make-parameter (gensym)))
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(define (eof? x) (equal? x (current-eof)))
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(define/typed (block-quads->lines qs)
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((Listof Quad) . -> . (Listof Quad))
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(block->lines (quads->block qs)))
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(define/typed (typeset x)
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(Quad . -> . Quad) ; (coerce/input? . -> . doc?)
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(load-text-cache-file)
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(define pages (append* (for/list : (Listof (Listof Quad)) ([multipage (in-list (input->nested-blocks x))])
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(columns->pages (append* (for/list : (Listof (Listof Quad)) ([multicolumn (in-list multipage)])
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(lines->columns (append* (for/list : (Listof (Listof Quad)) ([block-quads (in-list multicolumn)])
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(block-quads->lines block-quads))))))))))
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(define doc (pages->doc pages))
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(update-text-cache-file)
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doc)
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