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#lang debug racket/base
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(require (for-syntax racket/base) txexpr racket/runtime-path racket/string racket/promise racket/match racket/list
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pitfall quad sugar/debug pollen/tag racket/unsafe/ops)
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(provide (except-out (all-from-out racket/base) #%module-begin)
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(rename-out [mb #%module-begin])
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p id strong em attr-list h1 h2 h3 h4 h5 h6
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ol li ul rsquo lsquo rdquo ldquo hellip ndash mdash
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hr
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code pre a blockquote)
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(define rsquo "’")
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(define rdquo "”")
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(define lsquo "‘")
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(define ldquo "“")
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(define hellip "…")
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(define ndash "–")
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(define mdash "—")
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(define-tag-function (p attrs exprs)
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(qexpr (append `((display ,(symbol->string (gensym)))) attrs) exprs))
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(define-tag-function (hr attrs exprs)
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hrbr)
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(define-tag-function (blockquote attrs exprs)
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(qexpr (append '((display "block")
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(background-color "#eee")
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(font "fira") (fontsize "10") (line-height "15")
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(border-width-top "0.5") (border-color-top "gray") (border-inset-top "8")
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(border-width-left "3") (border-color-left "gray") (border-inset-left "20")
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(border-width-bottom "0.5") (border-color-bottom "gray") (border-inset-bottom "-2")
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(border-width-right "0.5") (border-color-right "gray") (border-inset-right "20")
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(inset-top "10") (inset-bottom "8") (inset-left "30") (inset-right "30")
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(keep-lines "yes"))
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attrs) exprs))
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(define id (default-tag-function 'id))
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(define class (default-tag-function 'class))
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(define-tag-function (strong attrs exprs)
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(qexpr (cons '(font "charter-bold") attrs) exprs))
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(define-tag-function (a attrs exprs)
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(qexpr `((link ,(cadr (assoc 'href attrs)))(color "MediumVioletRed")) exprs))
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(define-tag-function (em attrs exprs)
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(qexpr (cons '(font "charter-italic") attrs) exprs))
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(define-syntax-rule (attr-list . attrs) 'attrs)
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(define (heading-base font-size attrs exprs)
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(qexpr (append `((font "fira-light") (display "block") (fontsize ,(number->string font-size))(line-height ,(number->string (* 1.2 font-size))) (border-width-top "0.5")(border-inset-top "9")(border-inset-right "12") (inset-bottom "-3") (inset-top "6") (keep-lines "next")) attrs) exprs))
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(define-tag-function (h1 attrs exprs)
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(heading-base 20 (append '() attrs) exprs))
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(define-tag-function (h2 attrs exprs) (heading-base 16 attrs exprs))
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(define-tag-function (h3 attrs exprs) (heading-base 14 attrs exprs))
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(define h4 h3)
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(define h5 h3)
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(define h6 h3)
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(define-tag-function (code attrs exprs)
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(qexpr (append '((font "fira-mono")(fontsize "10")(bg "aliceblue")) attrs) exprs))
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(define-tag-function (pre attrs exprs)
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;; pre needs to convert white space to equivalent layout elements
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(define new-exprs (add-between
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(for*/list ([expr (in-list exprs)]
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[str (in-list (string-split (string-join (get-elements expr) "") "\n"))])
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`(,(get-tag expr) ,(get-attrs expr) ,(string-replace str " " " ")))
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lbr))
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(qexpr (list* '(display "block") '(background-color "aliceblue")
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'(font "fira-mono") '(fontsize "11") '(line-height "14")
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'(border-inset-top "10")
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'(border-width-left "2") '(border-color-left "#669") '(border-inset-left "0")
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'(border-inset-right "10") '(border-inset-bottom "-4")
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'(inset-left "12") '(inset-right "12") '(inset-top "12") '(inset-bottom "8")
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attrs) new-exprs))
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(define draw-debug? #t)
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(define draw-debug-line? #f)
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(define draw-debug-block? #t)
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(define draw-debug-string? #f)
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(define (list-base attrs exprs [bullet-val #f])
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(qexpr (list* '(inset-left "20") attrs)
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(add-between
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(for/list ([(expr idx) (in-indexed exprs)])
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(list* (get-tag expr) (cons (list 'list-index (or bullet-val (format "~a" (add1 idx)))) (get-attrs expr)) (get-elements expr)))
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pbr)))
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(define-tag-function (ol attrs exprs) (list-base attrs exprs))
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(define-tag-function (ul attrs exprs) (list-base attrs exprs "•"))
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(define-tag-function (li attrs exprs) (qexpr attrs exprs))
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(define q:string (q #:in 'bi
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#:out 'bo ;; align to baseline
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;; printable unless single space, which is not printable at start or end
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#:printable (λ (q [sig #f])
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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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;; draw with pdf text routine
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#:draw (λ (q doc)
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(when (pair? (quad-elems q))
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(font doc (path->string (hash-ref (quad-attrs q) 'font)))
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(font-size doc (hash-ref (quad-attrs q) 'fontsize 12))
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(fill-color doc (hash-ref (quad-attrs q) 'color "black"))
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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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#:bg (hash-ref (quad-attrs q) 'bg #f)
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#:features (list (cons #"tnum" 1))
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#:link (hash-ref (quad-attrs q) 'link #f))))
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#:draw-end (if draw-debug-string?
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(λ (q doc) (draw-debug q doc "#99f" "#ccf"))
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void)))
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(define-runtime-path charter "fonts/charter.ttf")
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(define-runtime-path charter-bold "fonts/charter-bold.ttf")
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(define-runtime-path charter-italic "fonts/charter-italic.ttf")
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(define-runtime-path fira "fonts/fira.ttf")
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(define-runtime-path fira-light "fonts/fira-light.ttf")
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(define-runtime-path fira-mono "fonts/fira-mono.ttf")
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(define default-font-face charter)
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(define default-font-size 12)
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(define (->string-quad doc q)
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(cond
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[(line-break? q) q]
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[else
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(struct-copy
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quad q:string
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[attrs (let ([attrs (quad-attrs q)])
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;; attrs hashes are shared between many quads.
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;; so the first update will change every reference to the shared hash
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;; hence why we ignore if val is already a path
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;; but this op should ideally happen earlier
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(hash-update! attrs 'font
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(λ (val) (if (path? val)
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val
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(match (string-downcase (string-replace val " " "-"))
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["charter" charter]
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["charter-bold" charter-bold]
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["charter-italic" charter-italic]
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["fira" fira]
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["fira-light" fira-light]
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["fira-mono" fira-mono])))
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default-font-face)
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(hash-ref! attrs 'fontsize default-font-size)
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attrs)]
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[elems (quad-elems q)]
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[size (delay
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(define fontsize (hash-ref (quad-attrs q) 'fontsize))
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(font-size doc fontsize)
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(font doc (path->string (hash-ref (quad-attrs q) 'font)))
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(define str (if (pair? (quad-elems q)) (unsafe-car (quad-elems q)) ""))
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(define line-height (cond
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[(and (pair? (quad-elems q)) (quad-ref q 'line-height))]
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[else (current-line-height doc)]))
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(pt (string-width doc str) line-height))])]))
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(define (draw-debug q doc [fill-color "#f99"] [stroke-color "#fcc"])
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(when draw-debug?
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(save doc)
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(line-width doc 0.5)
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(apply rect doc (append (quad-origin q) (size q)))
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(stroke doc stroke-color)
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(circle doc (pt-x (in-point q)) (pt-y (in-point q)) 2)
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(circle doc (pt-x (out-point q)) (pt-y (out-point q)) 2)
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(fill doc fill-color)
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(rect-centered doc (pt-x (inner-point q)) (pt-y (inner-point q)) 2)
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(fill doc stroke-color)
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(restore doc)))
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(define line-height 20)
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(define dumb-hardcoded-value 380.1234)
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(define q:line (q #:size (pt dumb-hardcoded-value line-height)
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#:inner 'sw
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#:out 'sw
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#:printable #true
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#:draw-start (if draw-debug-line? draw-debug void)))
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(struct line-spacer quad () #:transparent)
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(define q:line-spacer (q #:type line-spacer
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#:size (pt dumb-hardcoded-value (* line-height 0.6))
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#:out 'sw
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#:printable (λ (q sig) (not (memq sig '(start end))))
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#:draw-start (if draw-debug-line? draw-debug void)))
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(define q:line-spacer-unbreakable
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(struct-copy line-spacer q:line-spacer
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[attrs #:parent quad
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(make-hasheq '((keep-lines . #true)))]))
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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)
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(for/fold ([runs empty]
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[pcs pcs]
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#:result (reverse runs))
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([i (in-naturals)]
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#:break (empty? pcs))
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(define-values (run-pcs rest) (splitf-at pcs (λ (p) (same-run? (car pcs) p))))
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(define new-run (struct-copy quad q:string
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[attrs (quad-attrs (car pcs))]
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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 (car pcs)))))]))
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(values (cons new-run runs) rest)))
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(define-quad line-break quad ())
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(define lbr (make-line-break #:printable #f))
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;; treat paragraph break as special kind of line break
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(define-quad para-break line-break ())
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(define pbr (make-para-break #:printable #f))
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(define-quad hr-break para-break ())
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(define hrbr (make-hr-break #:printable #t))
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(module+ test
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(check-true (line-break? (second (quad-elems (q "foo" pbr "bar")))))
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(check-true (line-break? (second (atomize (q "foo" pbr "bar"))))))
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(define (copy-block-attrs source-hash dest-hash)
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(define block-attrs '(display
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inset-top inset-bottom inset-left inset-right
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border-inset-top border-inset-bottom border-inset-left border-inset-right
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border-width-left border-width-right border-width-top border-width-bottom
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border-color-left border-color-right border-color-top border-color-bottom
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background-color
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keep-lines))
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(for* ([k (in-list block-attrs)]
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[v (in-value (hash-ref source-hash k #f))]
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#:when v)
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(hash-set! dest-hash k v))
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dest-hash)
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(define (line-wrap xs wrap-size)
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(wrap xs (λ (q idx) (- wrap-size
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(quad-ref q 'inset-left 0)
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(quad-ref q 'inset-right 0)))
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#:hard-break line-break?
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#:soft-break soft-break-for-line?
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;; restart wrap count after each paragraph break
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;; so idx=1 means first line in any paragraph
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#:wrap-count (λ (idx q) (if (para-break? q) 1 (add1 idx)))
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#:finish-wrap
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(λ (pcs opening-q ending-q idx)
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(append
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(cond
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[(empty? pcs) null]
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[(hr-break? ending-q)
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(list (struct-copy quad q:line
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[draw-start (λ (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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(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 3)
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(stroke doc "#999"))]))]
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[else
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(match (consolidate-runs pcs)
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[(? pair? elems)
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(define elem (unsafe-car elems))
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(list (struct-copy quad q:line
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;; move block attrs up, so they are visible in page wrap
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[attrs (copy-block-attrs (quad-attrs elem)
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(hash-copy (quad-attrs q:line)))]
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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 (let ()
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(define line-heights
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(filter-map (λ (q) (quad-ref q 'line-height)) pcs))
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(match-define (list w h) (quad-size q:line))
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(pt w (if (empty? line-heights) h (apply max line-heights))))]
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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 (append
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(match (and (= idx 1) (quad-ref elem 'list-index))
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[#false null]
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[bullet (list (make-quad
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#:elems (list (struct-copy quad (car elems)
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[elems (list (if (number? bullet)
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(format "~a." bullet)
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bullet))]))))])
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(list (make-quad
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#:offset (pt (quad-ref elem 'inset-left 0) 0)
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#:elems elems)))]))]
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[_ null])])
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(if (and (para-break? ending-q) (not (hr-break? ending-q)))
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(list (if (equal? (quad-ref (car pcs) 'keep-lines) "next")
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q:line-spacer-unbreakable
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q:line-spacer))
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null)))))
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(define zoom-mode? #f)
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(define top-margin 60)
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(define bottom-margin 120)
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(define side-margin 120)
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(define page-offset (pt (/ side-margin (if zoom-mode? 3 1))
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(/ top-margin (if zoom-mode? 3 1))))
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(require racket/date)
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(define q:page (q #:offset page-offset
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#:draw-start (λ (q doc) (add-page doc)
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(scale doc (if zoom-mode? 3 1) (if zoom-mode? 3 1)))
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#:draw-end (λ (q doc)
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(font-size doc 10)
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(font doc charter)
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(fill-color doc "black")
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(text doc (format "~a · ~a at ~a" (hash-ref (quad-attrs q) 'page-number)
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(hash-ref (quad-attrs q) 'doc-title)
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(date->string (current-date) #t))
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side-margin
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(+ (- (pdf-height doc) bottom-margin) 20)))))
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(define q:doc (q #:draw-start (λ (q doc) (start-doc doc))
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#:draw-end (λ (q doc) (end-doc doc))))
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(define (block-wrap lines)
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(define first-line (car lines))
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(q #:in 'nw
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#:out 'sw
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#:offset (pt 0 (+ (quad-ref first-line 'inset-top 0)))
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#:elems lines
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#:size (delay (pt (pt-x (size first-line)) ;
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(+ (for/sum ([line (in-list lines)])
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(pt-y (size line)))
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(quad-ref first-line 'inset-top 0)
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(quad-ref first-line 'inset-bottom 0))))
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#:draw-start (λ (q doc)
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;; adjust drawing coordinates for border inset
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(match-define (list bil bit bir bib)
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(map (λ (k) (quad-ref first-line k 0))
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'(border-inset-left border-inset-top border-inset-right border-inset-bottom)))
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(match-define (list left top) (map + (quad-origin q) (list bil bit)))
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(match-define (list width height) (map - (size q) (list (+ bil bir) (+ bit bib))))
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;; fill rect
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(cond
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[(quad-ref first-line 'background-color)
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=> (λ (bgcolor)
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(rect doc left top width height)
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(fill doc bgcolor))])
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;; draw border
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(match-define (list bw-left bw-top bw-right bw-bottom)
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(map (λ (k) (max 0 (quad-ref first-line k 0))) '(border-width-left
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border-width-top
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border-width-right
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border-width-bottom)))
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;; adjust start and end points based on adjacent border width
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;; so all borders overlap rectangularly
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(define (half x) (/ x 2.0))
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(define right (+ left width))
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(define bottom (+ top height))
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(define (box-side x1 y1 x2 y2 color stroke-width)
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(when (positive? stroke-width)
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(move-to doc x1 y1)
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(line-to doc x2 y2)
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(stroke doc (or color "black") stroke-width)))
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(box-side (- left (half bw-left)) top (+ right (half bw-right)) top
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(quad-ref first-line 'border-color-top) bw-top)
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(box-side right (- top (half bw-top)) right (+ bottom (half bw-bottom))
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(quad-ref first-line 'border-color-right) bw-right)
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(box-side (+ right (half bw-right)) bottom (- left (half bw-left)) bottom
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(quad-ref first-line 'border-color-bottom) bw-bottom)
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(box-side left (+ bottom (half bw-bottom)) left (- top (half bw-top))
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(quad-ref first-line 'border-color-left) bw-left))
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#:draw-end (if draw-debug-block?
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(λ (q doc) (draw-debug q doc "#6c6" "#9c9"))
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void)))
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(define (contiguous-group-by pred xs)
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;; like `group-by`, but only groups together contiguous xs with the same pred value.
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(let loop ([xs xs][groups null])
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(match xs
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[(== empty) (reverse groups)]
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[(cons first-x other-xs)
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(define equivalence-val (pred first-x))
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(define-values (group-members rest) (splitf-at other-xs (λ (x) (equal? (pred x) equivalence-val))))
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(define new-group (cons first-x group-members)) ; group-members might be empty
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(loop rest (cons new-group groups))])))
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(module+ test
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(require rackunit)
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(check-equal?
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(contiguous-group-by values '(1 1 2 2 2 3 4 5 5 6 6 7 8 9))
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'((1 1) (2 2 2) (3) (4) (5 5) (6 6) (7) (8) (9))))
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(define (page-wrap xs vertical-height path)
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(wrap xs vertical-height
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#:soft-break (λ (q) #true)
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#:no-break (λ (q) (quad-ref q 'keep-lines))
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#:distance (λ (q dist-so-far wrap-qs)
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;; do trial block insertions
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(for/sum ([x (in-list (insert-blocks wrap-qs))])
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(pt-y (size x))))
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#:finish-wrap (λ (lns q0 q idx)
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(list (struct-copy quad q:page
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[attrs (let ([page-number idx]
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[h (hash-copy (quad-attrs q:page))])
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(hash-set! h 'page-number page-number)
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(define-values (dir name _)
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(split-path (path-replace-extension path #"")))
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(hash-set! h 'doc-title (string-titlecase (path->string name)))
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h)]
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[elems (insert-blocks lns #t)])))))
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(define (insert-blocks lines [debug #f])
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(define groups-of-lines (contiguous-group-by (λ (x) (quad-ref x 'display)) lines))
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(append* (for/list ([line-group (in-list groups-of-lines)])
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(match (quad-ref (car line-group) 'display)
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[#false line-group]
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[_ (list (block-wrap line-group))]))))
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(define (run xs path)
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(define pdf (time-name make-pdf (make-pdf #:compress #t
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|
|
#:auto-first-page #f
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|
|
#:output-path path
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|
#:width (if zoom-mode? 350 612)
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|
#:height (if zoom-mode? 400 792))))
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|
(define line-width (- (pdf-width pdf) (* 2 side-margin)))
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|
(define vertical-height (- (pdf-height pdf) top-margin bottom-margin))
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|
|
(let* ([x (time-name atomize (atomize (qexpr->quad xs)))]
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[x (time-name ->string-quad (map (λ (x) (->string-quad pdf x)) x))]
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[x (time-name line-wrap (line-wrap x line-width))]
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|
[x (time-name page-wrap (page-wrap x vertical-height path))]
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|
[x (time-name position (position (struct-copy quad q:doc [elems x])))])
|
|
|
(time-name draw (draw x pdf))))
|
|
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|
(define-syntax (mb stx)
|
|
|
(syntax-case stx ()
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|
|
[(_ PDF-PATH . STRS)
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|
|
#'(#%module-begin
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|
|
;; stick an nbsp in the strings so we have one printing char
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|
|
(define strs (match (list . STRS)
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|
|
[(? null?) '(" ")]
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|
[strs strs]))
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|
|
(define qx (list* 'q null (add-between strs pbr)))
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|
|
(run qx PDF-PATH))]))
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|
|
|
|
|
(module+ reader
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|
|
(require scribble/reader syntax/strip-context (only-in markdown parse-markdown)
|
|
|
racket/match txexpr)
|
|
|
(provide (rename-out [quad-read-syntax read-syntax]))
|
|
|
|
|
|
|
|
|
(define (xexpr->parse-tree x)
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|
|
;; an ordinary txexpr can't serve as a parse tree because of the attrs list fails when passed to #%app.
|
|
|
;; so stick an `attr-list` identifier on it which can hook into the expander.
|
|
|
;; sort of SXML-ish.
|
|
|
(let loop ([x x])
|
|
|
(match x
|
|
|
[(txexpr tag attrs elems) (list* tag (cons 'attr-list attrs) (map loop elems))]
|
|
|
[(? list? xs) (map loop xs)]
|
|
|
[_ x])))
|
|
|
|
|
|
(define (quad-read-syntax path-string p)
|
|
|
(define quad-at-reader (make-at-reader
|
|
|
#:syntax? #t
|
|
|
#:inside? #t
|
|
|
#:command-char #\◊))
|
|
|
(define stx (quad-at-reader path-string p))
|
|
|
(define parsed-stx (datum->syntax stx (xexpr->parse-tree (parse-markdown (apply string-append (syntax->datum stx))))))
|
|
|
(strip-context
|
|
|
(with-syntax ([PT parsed-stx]
|
|
|
[PDF-PATH (path-replace-extension path-string #".pdf")])
|
|
|
#'(module _ qtest/markdown
|
|
|
PDF-PATH
|
|
|
. PT)))))
|