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124 lines
5.7 KiB
Racket
124 lines
5.7 KiB
Racket
#lang debug racket/base
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(require (for-syntax racket/base) racket/runtime-path racket/promise racket/match racket/list
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pitfall quad sugar/debug markdown pollen/tag (prefix-in pt: pollen/top))
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(provide (except-out (all-from-out racket/base) #%module-begin #%top)
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(rename-out [mb #%module-begin][pt:#%top #%top])
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(all-defined-out))
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(define-syntax-rule (p attrs . exprs)
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(list 'q 'attrs . exprs))
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(define q:string (q #:in 'bi #: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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(case (car (quad-elems q))
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[(" " #\space) (not (memq sig '(start end)))]
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[else #true]))
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;; draw with pdf text routine
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#:draw (λ (q doc)
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(define str (car (quad-elems q)))
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(apply text doc str (quad-origin q)))))
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(define-runtime-path charter "fonts/charter.ttf")
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(define-runtime-path fira "fonts/fira.ttf")
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(define (->string-quad doc q)
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(struct-copy 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 (λ (val) (if (path? val)
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val
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(match (string-downcase val)
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["charter" charter]
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["fira" fira]))))
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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 (string->number (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 (car (quad-elems q)))
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(pt (string-width doc str) (current-line-height doc)))]))
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(define line-height 20)
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(define q:line (q #:size (pt +inf.0 line-height)
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#:out 'sw
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#:printable #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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(member (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 (line-wrap xs size)
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(break xs size
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#:soft-break-proc soft-break-for-line?
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#:finish-wrap-proc (λ (pcs) (list (struct-copy quad q:line
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[elems (consolidate-runs pcs)])))))
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(define q:page (q #:offset '(36 36)
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#:pre-draw (λ (q doc) (add-page doc))))
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(define q:doc (q #:pre-draw (λ (q doc) (start-doc doc))
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#:post-draw (λ (q doc) (end-doc doc))))
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(define (page-wrap xs vertical-height)
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(break xs vertical-height #:finish-wrap-proc (λ (pcs) (list (struct-copy quad q:page [elems pcs])))))
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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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(define line-width 200)
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(define vertical-height 200)
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(let* ([x (time-name runify (runify (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))]
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[x (time-name position (position (struct-copy quad q:doc [elems x])))])
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(time-name draw (draw x pdf))))
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(define-syntax (mb stx)
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(syntax-case stx ()
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[(_ . STRS)
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(with-syntax ([PS (syntax-property #'STRS 'ps)])
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#'(#%module-begin
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(define qx `(q ((font "Charter") (fontsize "12")) ,@(list . STRS)))
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(run qx PS)))]))
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(module reader syntax/module-reader
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qtest/markdown
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#:read quad-read
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#:read-syntax quad-read-syntax
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#:whole-body-readers? #t ;; need this to make at-reader work
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(require scribble/reader markdown pollen/private/splice)
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(define (quad-read p) (syntax->datum (quad-read-syntax (object-name p) p)))
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(define (quad-read-syntax path-string p)
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(define quad-at-reader (make-at-reader
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#:syntax? #t
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#:inside? #t
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#:command-char #\◊))
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(define stx (quad-at-reader path-string p))
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(define parsed-stx (datum->syntax stx (parse-markdown (apply string-append (syntax->datum stx)))))
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(syntax-property parsed-stx 'ps (path-replace-extension path-string #".pdf")))) |