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#lang debug racket/base
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(require racket/promise
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racket/match
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racket/list
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sugar/list
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txexpr/base
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racket/date
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pitfall
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quad
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racket/unsafe/ops
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"attrs.rkt"
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"param.rkt"
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"font.rkt"
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"log.rkt")
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(provide (all-defined-out))
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(define-quad string-quad quad ())
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(define (q:string-draw q doc)
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(when (pair? (quad-elems q))
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(font doc (path->string (quad-ref q font-path-key default-font-face)))
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(font-size doc (quad-ref q :font-size default-font-size))
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(fill-color doc (quad-ref q :font-color default-font-color))
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(define str (unsafe-car (quad-elems q)))
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(match-define (list x y) (quad-origin q))
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(text doc str x y
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#:tracking (quad-ref q :font-tracking 0)
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#:bg (quad-ref q :bg)
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#:features (quad-ref q :font-features default-font-features)
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#:link (quad-ref q :link))))
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(define (q:string-draw-end q doc)
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(when (draw-debug-string?)
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(draw-debug q doc "#99f" "#ccf")))
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(define (q:string-printable? q [sig #f])
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;; printable unless single space, which is not printable at start or end
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(match (quad-elems q)
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[(cons elem _)
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(case elem
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[(" " #\space) (not (memq sig '(start end)))]
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[else #true])]
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[_ #true]))
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(define q:string (q #:type string-quad
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#:from 'bo
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#:to 'bi
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#:id 'str
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#:printable q:string-printable?
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#:draw q:string-draw
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#:draw-end q:string-draw-end))
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(define-quad image-quad quad ())
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(define (q:image-draw q doc)
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(define img (quad-ref q :image-object))
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(match-define (list x y) (quad-origin q))
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(match-define (list w h) (size q))
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(image doc img x y
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#:width w
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#:height h))
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(define (q:image-draw-end q doc)
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(when (draw-debug-image?)
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(draw-debug q doc "orange" "orange")))
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(define q:image (q #:type image-quad
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#:from 'bo
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#:to 'bi
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#:id 'image
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#:printable #true
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#:draw q:image-draw
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#:draw-end q:image-draw-end))
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(define (make-size-promise q [str-arg #f])
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(delay
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(define pdf (current-pdf))
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(define str
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(cond
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[str-arg]
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[(pair? (quad-elems q)) (unsafe-car (quad-elems q))]
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[else #false]))
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(define string-size
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(cond
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[str
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(font-size pdf (quad-ref q :font-size default-font-size))
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(font pdf (path->string (quad-ref q font-path-key default-font-face)))
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(if (equal? str "\u00AD")
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(quad-ref q :font-tracking 0)
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(+ (string-width pdf str
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#:tracking (quad-ref q :font-tracking 0)
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#:features (quad-ref q :font-features default-font-features))))]
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[else 0]))
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(list string-size (quad-ref q :line-height (current-line-height pdf)))))
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(define (generic->typed-quad q)
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(cond
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[(line-break-quad? q) q]
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[(match (quad-ref q :image-data)
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[#false #false]
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[(? file-exists? path-string)
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(define img-obj (open-image (current-pdf) path-string))
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(define img-width ($img-width img-obj))
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(define img-height ($img-height img-obj))
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(match-define (list layout-width layout-height)
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(match (list (quad-ref q :image-width) (quad-ref q :image-height))
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[(list (? number? w) (? number? h)) (list w h)]
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[(list #false (? number? h)) (define ratio (/ h img-height))
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(list (* ratio img-width) h)]
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[(list (? number? w) #false) (define ratio (/ w img-width))
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(list w (* ratio img-height))]))
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(struct-copy
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image-quad q:image
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[attrs #:parent quad (let ([h (hash-copy (quad-attrs q))])
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;; defeat 'bi 'bo positioning by removing font reference
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(hash-set! h font-path-key #false)
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;; save the img-obj for later
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(hash-set! h :image-object img-obj)
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h)]
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[size #:parent quad (pt layout-width layout-height)])]
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[bad-path (raise-argument-error 'quadwriter "image path that exists" bad-path)])]
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[else
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(struct-copy
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string-quad q:string
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[attrs #:parent quad (let ([attrs (quad-attrs q)])
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(hash-ref! attrs :font-size default-font-size)
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attrs)]
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[elems #:parent quad (quad-elems q)]
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[size #:parent quad (make-size-promise q)])]))
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(define (draw-debug q doc [fill-color "#f99"] [stroke-color "#fcc"] [stroke-width 0.5])
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(when (draw-debug?)
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(save doc)
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;; draw layout box
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(line-width doc stroke-width)
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; subtracting stroke-width keeps adjacent boxes from overlapping
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(save doc)
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(apply rect doc (append (pt+ (quad-origin q)) (map (λ (x) (- x stroke-width)) (size q))))
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(clip doc)
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(define pt (to-point q))
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(circle doc (pt-x pt) (pt-y pt) (+ 3 stroke-width))
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(fill doc fill-color)
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(restore doc)
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(apply rect doc (append (pt+ (quad-origin q)) (map (λ (x) (- x stroke-width)) (size q))))
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(stroke doc stroke-color)
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(restore doc)))
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(define-quad line-break-quad quad ())
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(define q:line-break (make-line-break-quad #:printable #f
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#:id 'line-break))
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(define-quad para-break-quad line-break-quad ())
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(define q:para-break (make-para-break-quad #:printable #f
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#:id 'para-break))
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(define-quad hr-break-quad line-break-quad ())
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(define q:hr-break (make-hr-break-quad #:printable #t
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#:id 'hr-break))
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(define-quad column-break-quad line-break-quad ())
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(define q:column-break (make-column-break-quad #:printable #f
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#:id 'column-break))
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(define-quad page-break-quad column-break-quad ())
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(define q:page-break (make-page-break-quad #:printable #f
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#:id 'page-break))
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(define q:line (q #:size (pt 0 default-line-height)
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#:from 'sw
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#:to 'nw
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#:printable #true
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#:id 'line
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#:draw-start (if draw-debug-line? draw-debug void)))
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(define-quad line-spacer-quad line-break-quad ())
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(define only-prints-in-middle (λ (q sig) (not (memq sig '(start end)))))
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(define (make-paragraph-spacer maybe-first-line-q key default-val)
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(define arbitrary-width 20)
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(q #:type line-spacer-quad
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#:size (pt arbitrary-width (cond
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[(and maybe-first-line-q (quad-ref maybe-first-line-q key))]
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[else default-val]))
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#:from 'sw
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#:to 'nw
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#:printable only-prints-in-middle
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#:draw-start (if (draw-debug-line?) draw-debug void)))
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(define softies (map string '(#\space #\- #\u00AD)))
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(define (soft-break-for-line? q)
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(and (pair? (quad-elems q))
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(member (unsafe-car (quad-elems q)) softies)))
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(define (consolidate-runs pcs ending-q)
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(let loop ([runs empty][pcs pcs])
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(match pcs
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[(? empty?) (reverse runs)]
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[(cons (? string-quad? strq) rest)
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(define-values (run-pcs rest) (splitf-at pcs (λ (p) (same-run? strq p))))
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(define new-run (quad-copy q:string
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[attrs (quad-attrs strq)]
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[elems (merge-adjacent-strings (apply append (for/list ([pc (in-list run-pcs)])
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(quad-elems pc))))]
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[size (delay (pt (for/sum ([pc (in-list run-pcs)])
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(pt-x (size pc)))
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(pt-y (size strq))))]))
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(loop (cons new-run runs) rest)]
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[(cons first rest) (loop (cons first runs) rest)])))
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(define (render-hyphen qs ending-q)
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;; naive handling of soft hyphen:
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;; if soft hyphen cause the break, then append a printing hyphen to the end of the run.
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;; this assumes that there is room for the hyphen on the line
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;; and does not take into account hyphen-break transformations found in other languages.
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;; However we do want the hyphen joined into the string so the final shaping / positioning is correct
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;; for instance, kerning between last letter and hyphen.
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(match (and ending-q (equal? (quad-elems ending-q) '("\u00AD")) qs)
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[(list head ... last-q)
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(define str (car (quad-elems last-q)))
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(define str+hyphen (string-append str "-"))
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(append head
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(list (quad-copy last-q
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[elems (list str+hyphen)]
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[size (make-size-promise last-q str+hyphen)])))]
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[_ qs]))
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(module+ test
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(require rackunit)
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(check-true (line-break-quad? (second (quad-elems (q "foo" q:page-break "bar")))))
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(check-true (line-break-quad? (second (atomize (q "foo" q:page-break "bar"))))))
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(define-quad filler-quad quad ())
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(define (sum-of-widths qss)
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(for*/sum ([qs (in-list qss)]
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[q (in-list qs)])
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(pt-x (size q))))
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(define (space-quad? q) (equal? (quad-elems q) (list " ")))
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(define (fill-wrap qs ending-q line-q)
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(match (and (pair? qs) (quad-ref (car qs) (if ending-q
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:line-align
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:line-align-last) "left"))
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[align-value
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;; words may still be in hyphenated fragments
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;; (though soft hyphens would have been removed)
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;; so group them (but no need to consolidate — that happens elsewhere)
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(define-values (word-space-sublists word-sublists) (partition* space-quad? qs))
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(match (length word-sublists)
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[1 #:when (equal? align-value "justify") qs] ; can't justify single word
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[word-count
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(match-define (list line-width line-height) (quad-size line-q))
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(define hung-word-sublists
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(match word-sublists
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[(list sublists ... (list prev-qs ... last-q))
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#:when (pair? (quad-elems last-q))
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(define last-char-str (regexp-match #rx"[.,:;’-]$" (car (quad-elems last-q))))
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(match last-char-str
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[#false word-sublists]
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[_ (define hanger-q (quad-copy last-q
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[elems null]
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[size (let ([p (make-size-promise last-q (car last-char-str))])
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(delay
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(match-define (list x y) (force p))
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(pt (- x) y)))]))
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(define last-sublist (append prev-qs (list last-q hanger-q)))
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(append sublists (list last-sublist))])]
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[_ word-sublists]))
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(define word-width (sum-of-widths hung-word-sublists))
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(define word-space-width (sum-of-widths word-space-sublists))
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(define empty-hspace (- line-width
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(quad-ref (car qs) :inset-left 0)
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word-width
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(quad-ref (car qs) :inset-right 0)))
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(define line-overfull? (negative? (- empty-hspace word-space-width)))
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(cond
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[(or (equal? align-value "justify")
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;; force justification upon overfull lines
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(and line-overfull? (> word-count 1)))
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(define justified-space-width (/ empty-hspace (sub1 word-count)))
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(apply append (add-between hung-word-sublists (list (make-quad
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#:from 'bo
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#:to 'bi
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#:draw-end q:string-draw-end
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#:size (pt justified-space-width line-height)))))]
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[(equal? align-value "left") qs] ; no filling needed
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[else
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(define space-multiplier (match align-value
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["center" 0.5]
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["right" 1]))
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;; subtact space-width because that appears between words
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;; we only care about redistributing the space on the ends
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(define end-hspace (- empty-hspace word-space-width))
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; make filler a leading quad, not a parent / grouping quad,
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;; so that elements can still be reached by consolidate-runs
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(list* (make-quad #:type filler-quad
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#:from-parent (quad-from-parent (car qs))
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#:from 'bo
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#:to 'bi
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#:size (pt (* end-hspace space-multiplier) 0)
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#:attrs (quad-attrs (car qs)))
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(quad-copy (car qs) [from-parent #f])
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(cdr qs))])])]))
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(define-quad offsetter-quad quad ())
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(define (hr-draw dq doc)
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(match-define (list left top) (quad-origin dq))
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(match-define (list right bottom) (size dq))
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(save doc)
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(translate doc left (+ top (/ bottom 2)))
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(move-to doc 0 0)
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(line-to doc right 0)
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(line-width doc 0.5)
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(stroke doc "black")
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(restore doc))
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(define (make-hr-quad line-q)
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(quad-copy line-q [draw-start hr-draw]))
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(define ((finish-line-wrap line-q) pcs-in opening-q ending-q idx)
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;; we curry line-q so that the wrap size can be communicated to this operation
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;; remove unused soft hyphens so they don't affect final shaping
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(define pcs-printing (for/list ([pc (in-list pcs-in)]
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#:unless (equal? (quad-elems pc) '("\u00AD")))
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pc))
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(define new-lines
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(cond
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[(empty? pcs-printing) null]
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[(hr-break-quad? ending-q) (list (make-hr-quad line-q))]
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[else
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;; render hyphen first so that all printable characters are available for size-dependent ops.
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(define pcs-with-hyphen (render-hyphen pcs-printing ending-q))
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;; fill wrap so that consolidate-runs works properly
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;; (justified lines won't be totally consolidated)
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(define pcs (fill-wrap pcs-with-hyphen ending-q line-q))
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(match (consolidate-runs pcs ending-q)
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[(? pair? elems)
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(define elem (unsafe-car elems))
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(match-define (list line-width line-height) (quad-size line-q))
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(define new-size (let ()
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(define line-heights
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(filter-map (λ (q) (or (quad-ref q :line-height) (pt-y (size q)))) pcs))
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(pt line-width (if (empty? line-heights) line-height (apply max line-heights)))))
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(list
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(struct-copy
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quad line-q
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;; move block attrs up, so they are visible in col wrap
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[attrs (copy-block-attrs (quad-attrs elem)
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(hash-copy (quad-attrs line-q)))]
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;; line width is static
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;; line height is the max 'line-height value or the natural height of q:line
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[size new-size]
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;; handle list indexes. drop new quad into line to hold list index
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;; could also use this for line numbers
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[elems
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;; we assume here that a list item has already had extra inset-left
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;; with room for a bullet
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;; which we just insert at the front.
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;; this is safe because line has already been filled.
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(append
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;; only put bullet into line if we're at the first line of the list item
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(match (and (eq? idx 1) (quad-ref elem :list-index))
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[#false null]
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[bullet
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(define bq (struct-copy
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quad q:string ;; copy q:string to get draw routine
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;; borrow attrs from elem
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[attrs (quad-attrs elem)]
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;; use bullet as elems
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[elems (list (if (number? bullet) (format "~a." bullet) bullet))]
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;; size doesn't matter because nothing refers to this quad
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;; just for debugging box
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[size (pt 15 (pt-y (size line-q)))]))
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(from-parent (list bq) 'sw)])
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(from-parent
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(match (quad-ref elem :inset-left 0)
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[0 elems]
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[inset-val
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|
|
(cons (make-quad
|
|
|
#:draw-end q:string-draw-end
|
|
|
#:to 'sw
|
|
|
#:size (pt inset-val 5)
|
|
|
#:type offsetter-quad)
|
|
|
elems)]) 'sw))]))]
|
|
|
[_ null])]))
|
|
|
(define maybe-first-line (match new-lines [(cons line0 _) line0][_ #false]))
|
|
|
(append (match opening-q
|
|
|
[#false (list (make-paragraph-spacer maybe-first-line :space-before 0))] ; paragraph break
|
|
|
[_ null])
|
|
|
new-lines
|
|
|
(match ending-q
|
|
|
[(? page-break-quad? page-break) (list page-break)] ; hard page break
|
|
|
[#false (list (make-paragraph-spacer maybe-first-line :space-after (* default-line-height 0.6)))] ; paragraph break
|
|
|
[_ null]))) ; hard line break
|
|
|
|
|
|
|
|
|
(define (line-wrap qs wrap-size)
|
|
|
(match qs
|
|
|
[(? null?) null]
|
|
|
[_
|
|
|
(unless (positive? wrap-size)
|
|
|
(raise-argument-error 'line-wrap "positive number" wrap-size))
|
|
|
(define line-q (quad-copy q:line [size (pt wrap-size (pt-y (size q:line)))]))
|
|
|
(define permitted-justify-overfill
|
|
|
(match (quad-ref (car qs) :line-align)
|
|
|
;; allow justified lines to go wider,
|
|
|
;; and then fill-wrap will tighten thes word spaces
|
|
|
;; this makes justified paragraphs more even, becuase
|
|
|
;; some lines are a little tight, as opposed to all of them being loose
|
|
|
["justify" 1.04]
|
|
|
[_ 1]))
|
|
|
(apply append
|
|
|
;; next line removes all para-break? quads as a consequence
|
|
|
(for/list ([qs (in-list (filter-split qs para-break-quad?))])
|
|
|
(wrap qs
|
|
|
(λ (q idx) (* (- wrap-size
|
|
|
(quad-ref (car qs) :inset-left 0)
|
|
|
(quad-ref (car qs) :inset-right 0))
|
|
|
permitted-justify-overfill))
|
|
|
#:nicely (match (or (current-line-wrap) (quad-ref (car qs) :line-wrap))
|
|
|
[(or "best" "kp") #true]
|
|
|
[_ #false])
|
|
|
#:hard-break line-break-quad?
|
|
|
#:soft-break soft-break-for-line?
|
|
|
#:finish-wrap (finish-line-wrap line-q))))]))
|
|
|
|
|
|
(define (make-nobreak! q) (quad-set! q :no-colbr #true)) ; cooperates with col-wrap
|
|
|
|
|
|
(define (do-keep-with-next! reversed-lines)
|
|
|
;; paints nobreak onto spacers that follow keep-with-next lines
|
|
|
;; (we are iterating backward, so the geometrically previous ln follows the spacer)
|
|
|
(match reversed-lines
|
|
|
[(? null?) null]
|
|
|
[_ (for ([this-ln (in-list reversed-lines)]
|
|
|
[prev-ln (in-list (cdr reversed-lines))]
|
|
|
#:when (and (line-spacer-quad? this-ln)
|
|
|
(quad-ref prev-ln :keep-with-next)))
|
|
|
(make-nobreak! this-ln)
|
|
|
(make-nobreak! prev-ln))]))
|
|
|
|
|
|
(define (apply-keeps lines)
|
|
|
(define groups-of-lines (contiguous-group-by (λ (x) (quad-ref x :display)) lines))
|
|
|
(for*/fold ([reversed-lines null]
|
|
|
#:result (begin
|
|
|
(do-keep-with-next! reversed-lines)
|
|
|
(reverse reversed-lines)))
|
|
|
([group (in-list groups-of-lines)]
|
|
|
[group-len (in-value (length group))]
|
|
|
[(ln idx0) (in-indexed group)])
|
|
|
(define idx (add1 idx0))
|
|
|
;; always catch last line of block in this case
|
|
|
;; so later cases are guaranteed to have earlier lines.
|
|
|
(unless (eq? idx group-len)
|
|
|
(cond
|
|
|
;; if we have :keep-all we can skip :keep-first and :keep-last cases
|
|
|
[(quad-ref ln :keep-all-lines) (make-nobreak! ln)]
|
|
|
;; to keep n lines, we only paint the first n - 1
|
|
|
;; (because each nobr line sticks to the next)
|
|
|
[(let ([keep-first (quad-ref ln :keep-first-lines)])
|
|
|
(and (number? keep-first) (< idx keep-first)))
|
|
|
(make-nobreak! ln)]
|
|
|
[(let ([keep-last (quad-ref ln :keep-last-lines)])
|
|
|
(and (number? keep-last) (< (- group-len keep-last) idx)))
|
|
|
(make-nobreak! ln)]))
|
|
|
(cons ln reversed-lines)))
|
|
|
|
|
|
(define (page-draw-start q doc)
|
|
|
(add-page doc)
|
|
|
(scale doc (zoom-factor) (zoom-factor))
|
|
|
(draw-debug q doc "aliceblue" "aliceblue" 3))
|
|
|
|
|
|
(define (draw-page-footer q doc)
|
|
|
(match-define (list x y) (quad-origin q))
|
|
|
(font-size doc (* .8 default-font-size))
|
|
|
(font doc default-font-face)
|
|
|
(fill-color doc default-font-color)
|
|
|
(text doc (format "~a · ~a at ~a" (quad-ref q :page-number 0)
|
|
|
(quad-ref q :doc-title "untitled")
|
|
|
(date->string (current-date) #t))
|
|
|
x y))
|
|
|
|
|
|
(define (make-footer-quad col-q page-idx path)
|
|
|
(define-values (dir name _) (split-path (path-replace-extension path #"")))
|
|
|
(q #:size (pt 50 default-line-height)
|
|
|
#:attrs (hasheq :page-number (+ (quad-ref col-q :page-number-start 1) (sub1 page-idx))
|
|
|
:doc-title (string-titlecase (path->string name)))
|
|
|
#:from-parent 'sw
|
|
|
#:to 'nw
|
|
|
#:shift (pt 0 (* 1.5 default-line-height))
|
|
|
#:printable #true
|
|
|
#:draw-start (λ (q doc)
|
|
|
(when draw-debug-line?
|
|
|
(draw-debug q doc "goldenrod" "goldenrod"))
|
|
|
(unless (quadwriter-test-mode)
|
|
|
(draw-page-footer q doc)))))
|
|
|
|
|
|
(define q:column (q
|
|
|
#:id 'col
|
|
|
#:from 'ne
|
|
|
#:to 'nw))
|
|
|
|
|
|
(struct column-spacer-quad quad () #:transparent)
|
|
|
(define q:column-spacer (q #:type column-spacer-quad
|
|
|
#:from 'ne
|
|
|
#:to 'nw
|
|
|
#:printable only-prints-in-middle))
|
|
|
|
|
|
(define q:page (q
|
|
|
#:id 'page
|
|
|
#:from-parent 'nw
|
|
|
#:draw-start page-draw-start))
|
|
|
|
|
|
(define q:doc (q #:draw-start (λ (q doc) (start-doc doc))
|
|
|
#:draw-end (λ (q doc) (end-doc doc))))
|
|
|
|
|
|
(define ((block-draw-start first-line) q doc)
|
|
|
;; adjust drawing coordinates for border inset
|
|
|
(match-define (list bil bit bir bib)
|
|
|
(for/list ([k (in-list (list :border-inset-left :border-inset-top :border-inset-right :border-inset-bottom))])
|
|
|
(quad-ref first-line k 0)))
|
|
|
(match-define (list left top) (pt+ (quad-origin q) (list bil bit)))
|
|
|
(match-define (list width height) (pt- (size q) (list (+ bil bir) (+ bit bib))))
|
|
|
;; fill rect
|
|
|
(cond
|
|
|
[(quad-ref first-line :background-color)
|
|
|
=> (λ (bgcolor)
|
|
|
(rect doc left top width height)
|
|
|
(fill doc bgcolor))])
|
|
|
;; draw border
|
|
|
(match-define (list bw-left bw-top bw-right bw-bottom)
|
|
|
(map (λ (k) (max 0 (quad-ref first-line k 0))) (list
|
|
|
:border-width-left
|
|
|
:border-width-top
|
|
|
:border-width-right
|
|
|
:border-width-bottom)))
|
|
|
;; adjust start and end points based on adjacent border width
|
|
|
;; so all borders overlap rectangularly
|
|
|
(define (half x) (/ x 2.0))
|
|
|
(define right (+ left width))
|
|
|
(define bottom (+ top height))
|
|
|
(define (box-side x1 y1 x2 y2 color stroke-width)
|
|
|
(when (positive? stroke-width)
|
|
|
(move-to doc x1 y1)
|
|
|
(line-to doc x2 y2)
|
|
|
(stroke doc (or color "black") stroke-width)))
|
|
|
(box-side (- left (half bw-left)) top (+ right (half bw-right)) top
|
|
|
(quad-ref first-line :border-color-top) bw-top)
|
|
|
(box-side right (- top (half bw-top)) right (+ bottom (half bw-bottom))
|
|
|
(quad-ref first-line :border-color-right) bw-right)
|
|
|
(box-side (+ right (half bw-right)) bottom (- left (half bw-left)) bottom
|
|
|
(quad-ref first-line :border-color-bottom) bw-bottom)
|
|
|
(box-side left (+ bottom (half bw-bottom)) left (- top (half bw-top))
|
|
|
(quad-ref first-line :border-color-left) bw-left)
|
|
|
(case (quad-ref first-line :block-clip)
|
|
|
[(#true)
|
|
|
(when (eq? (log-clipping?) 'warn)
|
|
|
(for ([line (in-list (quad-elems q))])
|
|
|
(define line-width (pt-x (size line)))
|
|
|
(define line-elem-width (for/sum ([q (in-list (quad-elems line))])
|
|
|
(pt-x (size q))))
|
|
|
(when (< line-width line-elem-width)
|
|
|
(define error-str (apply string-append (for/list ([q (in-list (quad-elems line))])
|
|
|
(match (quad-elems q)
|
|
|
[(list (? string? str)) str]
|
|
|
[_ ""]))))
|
|
|
(log-quadwriter-warning (format "clipping overfull line: ~v" error-str)))))
|
|
|
(save doc)
|
|
|
(rect doc left top width height)
|
|
|
(clip doc)]))
|
|
|
|
|
|
(define ((block-draw-end first-line) q doc)
|
|
|
(case (quad-ref first-line :block-clip)
|
|
|
[(#true) (restore doc)])
|
|
|
(when (draw-debug-block?)
|
|
|
(draw-debug q doc "#6c6" "#9c9")))
|
|
|
|
|
|
(define/match (lines->block lines)
|
|
|
[((cons ln0 _))
|
|
|
(q #:from 'sw
|
|
|
#:to 'nw
|
|
|
#:elems (from-parent lines 'nw)
|
|
|
#:id 'block
|
|
|
#:attrs (quad-attrs ln0)
|
|
|
#:size (delay (pt (pt-x (size ln0)) ;
|
|
|
(+ (for/sum ([line (in-list lines)])
|
|
|
(pt-y (size line)))
|
|
|
(quad-ref ln0 :inset-top 0)
|
|
|
(quad-ref ln0 :inset-bottom 0))))
|
|
|
#:shift-elems (pt 0 (+ (quad-ref ln0 :inset-top 0)))
|
|
|
#:draw-start (block-draw-start ln0)
|
|
|
#:draw-end (block-draw-end ln0))])
|
|
|
|
|
|
(define/match (from-parent qs [where #f])
|
|
|
;; doesn't change any positioning. doesn't depend on state. can happen anytime.
|
|
|
;; can be repeated without damage.
|
|
|
[((? null?) _) null]
|
|
|
[((cons q rest) where)
|
|
|
(cons (quad-copy q [from-parent (or where (quad-from q))]) rest)])
|
|
|
|
|
|
(define ((col-finish-wrap col-quad) lns . _)
|
|
|
(match lns
|
|
|
[(cons first-line _)
|
|
|
(list (quad-copy col-quad
|
|
|
;; move block attrs up, so they are visible in page wrap
|
|
|
[attrs (copy-block-attrs (quad-attrs first-line)
|
|
|
(hash-copy (quad-attrs col-quad)))]
|
|
|
[elems (from-parent (insert-blocks lns) 'nw)]))]
|
|
|
[_ null]))
|
|
|
|
|
|
(define (column-wrap qs vertical-height column-gap [column-quad q:column])
|
|
|
(unless (positive? vertical-height)
|
|
|
(raise-argument-error 'col-wrap "positive number" vertical-height))
|
|
|
|
|
|
;; on timing of `insert-blocks`:
|
|
|
;; can't do it before because it depends on where columns are broken.
|
|
|
;; could do it after, but it would require going back inside each col quad
|
|
|
;; which seems overly interdependent, because `insert-blocks` is used to determine break locations.
|
|
|
;; `col-wrap` should emit quads that are complete.
|
|
|
(define col-spacer (quad-copy q:column-spacer [size (pt column-gap 100)]))
|
|
|
(add-between
|
|
|
(wrap qs vertical-height
|
|
|
#:soft-break #true
|
|
|
#:hard-break column-break-quad?
|
|
|
#:no-break (λ (q) (quad-ref q :no-colbr)) ; cooperates with make-nobreak
|
|
|
#:distance (λ (q dist-so-far wrap-qs)
|
|
|
;; do trial block insertions
|
|
|
(for/sum ([x (in-list (insert-blocks wrap-qs))])
|
|
|
(pt-y (size x))))
|
|
|
#:finish-wrap (col-finish-wrap column-quad))
|
|
|
col-spacer))
|
|
|
|
|
|
(define ((page-finish-wrap page-quad path) cols q0 q page-idx)
|
|
|
(define elems
|
|
|
(match (quad-ref (car cols) :footer-display #true)
|
|
|
[(or #false "none") (from-parent cols 'nw)]
|
|
|
[_ (cons (make-footer-quad (car cols) page-idx path) (from-parent cols 'nw))]))
|
|
|
(list (quad-copy page-quad [elems elems])))
|
|
|
|
|
|
(define (page-wrap qs width [page-quad q:page])
|
|
|
(unless (positive? width)
|
|
|
(raise-argument-error 'page-wrap "positive number" width))
|
|
|
(wrap qs width
|
|
|
#:soft-break #true
|
|
|
#:hard-break page-break-quad?
|
|
|
#:no-break (λ (q) (quad-ref q :no-pbr))
|
|
|
#:distance (λ (q dist-so-far wrap-qs)
|
|
|
(for/sum ([x (in-list wrap-qs)])
|
|
|
(pt-x (size x))))
|
|
|
#:finish-wrap (page-finish-wrap page-quad (pdf-output-path (current-pdf)))))
|
|
|
|
|
|
(define (insert-blocks lines)
|
|
|
(define groups-of-lines (contiguous-group-by (λ (x) (quad-ref x :display)) lines))
|
|
|
(append* (for/list ([line-group (in-list groups-of-lines)])
|
|
|
(if (quad-ref (car line-group) :display)
|
|
|
(list (lines->block line-group))
|
|
|
line-group))))
|
|
|
|
|
|
(define-quad first-line-indent-quad quad ())
|
|
|
|
|
|
(define (insert-first-line-indents qs-in)
|
|
|
;; first line indents are quads inserted at the beginning of a paragraph
|
|
|
;; (that is, just after a paragraph break)
|
|
|
;; they need to be installed before line wrap
|
|
|
;; to be compatible with first-fit and best-fit.
|
|
|
|
|
|
;; stick a pbr on the front if there isn't one already
|
|
|
;; because of the "lookahead" style of iteration
|
|
|
(define qs (match qs-in
|
|
|
[(list (? para-break-quad?) _ ...) qs-in]
|
|
|
[_ (cons q:page-break qs-in)]))
|
|
|
(for/fold ([qs-out null]
|
|
|
#:result (reverse qs-out))
|
|
|
([q (in-list qs)]
|
|
|
[next-q (in-list (cdr qs))])
|
|
|
(match (and (para-break-quad? q) (quad-ref next-q :first-line-indent 0))
|
|
|
[(or #false 0) (cons next-q qs-out)]
|
|
|
[indent-val (list* next-q (make-quad #:from 'bo
|
|
|
#:to 'bi
|
|
|
#:draw-end q:string-draw-end
|
|
|
#:type first-line-indent-quad
|
|
|
#:attrs (quad-attrs next-q)
|
|
|
#:size (pt indent-val 10)) qs-out)]))) |