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386 lines
17 KiB
Racket
386 lines
17 KiB
Racket
#lang debug racket/base
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(require racket/match
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racket/contract
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racket/file
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racket/string
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racket/sequence
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racket/list
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racket/dict
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pitfall
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quad
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hyphenate
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pollen/decode
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sugar/coerce
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sugar/list
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"attrs.rkt"
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"param.rkt"
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"font.rkt"
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"layout.rkt"
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"log.rkt")
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(provide (all-defined-out))
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(define (setup-pdf-path pdf-path-arg)
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;; convert pathlike arg into nice complete path.
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(path->complete-path
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(simplify-path
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(expand-user-path
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(->path
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(match pdf-path-arg
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;; a #false arg signals that we're going to return the bytes directly,
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;; so we use a temp path to write the file, and we'll delete it later.
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[#false (build-path (find-system-path 'temp-dir) "quadwriter-temp.pdf")]
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[path path]))))))
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(define (handle-hyphenate q)
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;; find quads that want hyphenation and split them into smaller pieces
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;; do this before ->string-quad so that it can handle the sizing promises
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(cond
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[(and (quad-ref q :hyphenate) (pair? (quad-elems q)) (andmap string? (quad-elems q)))
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(for*/list ([str (in-list (quad-elems q))]
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[hyphen-char (in-value #\u00AD)]
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[hstr (in-value (hyphenate str hyphen-char
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#:min-left-length 3
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#:min-right-length 3))]
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[substr (in-list (regexp-match* (regexp (string hyphen-char)) hstr #:gap-select? #t))])
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(quad-copy q [elems (list substr)]))]
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[else (list q)]))
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(define (string->feature-list str)
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(for/list ([kv (in-slice 2 (string-split str))])
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(cons (string->bytes/utf-8 (first kv)) (string->number (second kv)))))
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(define (parse-font-features! attrs)
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;; `font-features` are OpenType font feature specifiers.
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(match (hash-ref attrs :font-features-adjust #false)
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[(? string? str)
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;; adjustment: parse the feature string and append to the current feature set
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(define parsed-features (string->feature-list str))
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(hash-update! attrs :font-features (λ (fs) (remove-duplicates (append parsed-features fs) equal? #:key car)))
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;; once adjustment is incorporated, delete it
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(hash-set! attrs :font-features-adjust #false)]
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[_ (match (hash-ref attrs :font-features #false)
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;; override: parse features & replace current set
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[(? string? str)
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(define parsed-features (string->feature-list str))
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(hash-set! attrs :font-features parsed-features)]
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[_ (void)])]))
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(define (parse-dimension-strings! attrs)
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;; certain attributes can be "dimension strings", which are strings like "3in" or "4.2cm"
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;; we parse them into the equivalent measurement in points.
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(for ([k (in-hash-keys attrs)]
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#:when (takes-dimension-string? k))
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(hash-update! attrs k parse-dimension))
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attrs)
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(define (downcase-values! attrs)
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;; make attribute values lowercase, unless they're case-sensitive
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;; so we can check them more easily later.
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(for ([k (in-hash-keys attrs)]
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#:unless (has-case-sensitive-value? k))
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(hash-update! attrs k (λ (val) (match val
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[(? string? str) (string-downcase str)]
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[_ val]))))
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attrs)
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(define (complete-every-path! attrs)
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;; convert every pathlike thing to a complete path (string, because it's inside an attr)
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;; so we don't get tripped up later by relative paths
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;; relies on `current-directory` being parameterized to source file's dir
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(for ([k (in-hash-keys attrs)]
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#:when (takes-path? k))
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(hash-update! attrs k (compose1 path->string path->complete-path)))
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attrs)
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(define (handle-cascading-attrs attrs)
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;; various housekeeping on attributes as they are propagated downward during atomization.
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(for ([proc (in-list (list downcase-values!
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parse-dimension-strings!
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complete-every-path!
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resolve-font-path!
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resolve-font-size!
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resolve-font-tracking!
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resolve-line-height!
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parse-font-features!))])
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(proc attrs)))
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(define (drop-leading-breaks qs)
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;; any leading breaks are pointless at the start of the doc, so drop them.
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;; How would we get these?
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;; we might, for instance, have a first-level heading style that is specified with page break before.
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;; so if we invoke that style first, we will get a page break.
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(dropf qs break-quad?))
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(define default-line-height-multiplier 1.42)
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(define (setup-qs qx-arg base-dir)
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;; convert our input Q-expression into a useful form.
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;; some typographic niceties
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(define qexpr (decode qx-arg
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#:string-proc (compose1 smart-ellipses smart-dashes)
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#:txexpr-proc smart-quotes))
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;; apply some default styling attributes.
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;; These will only be used if the underlying q-expression hasn't specified its own values,
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;; which will naturally override these.
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(define q
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(qexpr->quad (list 'q (list->attrs
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:font-family default-font-family
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:font-size (number->string default-font-size)
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:line-height (number->string (floor (* default-line-height-multiplier default-font-size)))) qexpr)))
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(setup-font-path-table! base-dir)
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(let* ([qs (atomize q
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#:attrs-proc handle-cascading-attrs
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#:missing-glyph-action 'fallback
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#:fallback "fallback"
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#:emoji "fallback-emoji"
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#:math "fallback-math"
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#:font-path-resolver resolve-font-path!)]
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[qs (time-log hyphenate (apply append (map handle-hyphenate qs)))]
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[qs (map generic->typed-quad qs)]
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[qs (drop-leading-breaks qs)]
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[qs (insert-first-line-indents qs)])
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qs))
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(define (setup-margins qs page-width page-height)
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;; if only left or right margin is provided, copy other value in preference to default margin
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(define q (car qs))
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(define default-side-margin (min (* 72 1.5) (floor (* .20 page-width))))
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(define default-top-margin (min 72 (floor (* .10 page-height))))
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(define left (cond
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[(debug-x-margin)]
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[(quad-ref q :page-margin-left)]
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[(quad-ref q :page-margin-right)]
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[else default-side-margin]))
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(define right (cond
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[(debug-x-margin)]
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[(quad-ref q :page-margin-right)]
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[(quad-ref q :page-margin-left)]
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[else default-side-margin]))
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(define top (cond
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[(debug-y-margin)]
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[(quad-ref q :page-margin-top)]
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[(quad-ref q :page-margin-bottom)]
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[else default-top-margin]))
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(define bottom (cond
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[(debug-y-margin)]
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[(quad-ref q :page-margin-bottom)]
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[else
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(define vert-optical-adjustment 10)
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(+ vert-optical-adjustment
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(cond
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[(quad-ref q :page-margin-top)]
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[else (* default-top-margin 1.4)]))]))
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(list left top right bottom))
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(define default-column-count 1)
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(define (setup-column-count qs)
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(define cc (or (debug-column-count) (quad-ref (car qs) :column-count default-column-count)))
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(unless (exact-nonnegative-integer? cc)
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(raise-argument-error 'render-pdf "positive integer" cc))
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cc)
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(define default-column-gap 36)
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(define (setup-column-gap qs)
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(or (debug-column-gap) (quad-ref (car qs) :column-gap default-column-gap)))
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(define (setup-pdf-metadata! qs pdf)
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(define kv-dict
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(cons
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(cons 'Creator (format "Racket ~a [Quad library]" (version)))
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(for*/list ([(k pdf-k) (in-dict (list (cons :pdf-title 'Title)
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(cons :pdf-author 'Author)
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(cons :pdf-subject 'Subject)
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(cons :pdf-keywords 'Keywords)))]
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[str (in-value (and (pair? qs) (quad-ref (car qs) k)))]
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#:when str)
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(cons pdf-k str))))
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(for ([(k v) (in-dict kv-dict)])
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(hash-set! (pdf-info pdf) k v)))
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(define (footnote-flow? q) (equal? (quad-ref q 'flow) "footnote"))
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(define (make-lines qs line-wrap-size)
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(define-values (fn-qs main-qs) (partition footnote-flow? qs))
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(define line-qs (time-log line-wrap (apply-keeps (line-wrap main-qs line-wrap-size))))
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(define fn-line-qs (time-log fn-line-wrap (apply-keeps (line-wrap fn-qs line-wrap-size))))
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(values line-qs fn-line-qs))
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(define (make-columns line-qs fn-line-qs line-wrap-size printable-height column-gap)
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(define col-quad-prototype (quad-copy q:column
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[size (pt line-wrap-size printable-height)]))
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(time-log column-wrap (column-wrap line-qs fn-line-qs printable-height column-gap col-quad-prototype)))
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(define (make-pages column-qs
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left-margin
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top-margin
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gutter-margin
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line-wrap-size
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printable-width
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printable-height)
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(define (page-quad-prototype page-count)
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(define left-shift (+ left-margin (if (odd? page-count) gutter-margin 0)))
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(quad-copy q:page
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[shift (pt left-shift top-margin)]
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[size (pt line-wrap-size printable-height)]))
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(time-log page-wrap (page-wrap column-qs printable-width page-quad-prototype)))
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(define (make-sections qs)
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(for/fold ([sections-acc null]
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#:result (reverse sections-acc))
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([qs (in-list (filter-split qs section-break-quad?))])
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;; section properties
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(match-define (list page-width page-height) (parse-page-size (and (pair? qs) (car qs))))
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(match-define (list left-margin top-margin right-margin bottom-margin)
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(setup-margins qs page-width page-height))
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(define gutter-margin (and (pair? qs) (quad-ref (car qs) :page-margin-gutter 0)))
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(define printable-width (- page-width left-margin right-margin gutter-margin))
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(define printable-height (- page-height top-margin bottom-margin))
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(define column-count (setup-column-count qs))
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(define column-gap (setup-column-gap qs))
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(define line-wrap-size (/ (- printable-width (* (sub1 column-count) column-gap)) column-count))
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;; layout actions
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(define-values (line-qs fn-line-qs) (make-lines qs line-wrap-size))
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(define column-qs (make-columns line-qs fn-line-qs line-wrap-size printable-height column-gap))
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(define section-starting-side (string->symbol (quad-ref (car qs) :page-side-start "right")))
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(define insert-blank-page?
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(and (pair? qs)
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;; if we need a 'left page and will get 'right (or vice versa) then insert page
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(let ([next-page-side (if (even? (add1 (section-pages-used))) 'left 'right)])
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(not (eq? section-starting-side next-page-side)))))
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;; update page count before starting page wrap
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(when insert-blank-page?
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(section-pages-used (add1 (section-pages-used))))
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(define section-pages (make-pages column-qs
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left-margin
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top-margin
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gutter-margin
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line-wrap-size
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printable-width
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printable-height))
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(begin0
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(cond
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;; ignore empty section
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[(zero? (length section-pages)) sections-acc]
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[insert-blank-page?
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(match section-starting-side
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['left
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;; blank page goes at beginning of current section
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(define page-from-current-section (car section-pages))
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(define blank-page (quad-copy page-from-current-section [elems null]))
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(define new-section (quad-copy q:section [elems (cons blank-page section-pages)]))
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(cons new-section sections-acc)]
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[_ ;; must be 'right
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;; blank page goes at end of previous section (if it exists)
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(define new-section (quad-copy q:section [elems section-pages]))
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(match sections-acc
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[(cons previous-section other-sections)
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(define previous-section-pages (quad-elems previous-section))
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;; we know previous section has pages because we ignore empty sections
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(define page-from-previous-section (car previous-section-pages))
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(define blank-page (quad-copy page-from-previous-section [elems null]))
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(define updated-previous-section
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(quad-update! previous-section
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[elems (append previous-section-pages (list blank-page))]))
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(list* new-section updated-previous-section other-sections)]
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[_ (list new-section)])])]
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[else (define new-section (quad-copy q:section [elems section-pages]) )
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(cons new-section sections-acc)])
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(section-pages-used (+ (section-pages-used) (length section-pages))))))
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(define (correct-line-alignment doc)
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;; correct lines with inner / outer alignment
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(for* ([(page page-idx) (in-indexed (for*/list ([section (in-list (quad-elems doc))]
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[page (in-list (quad-elems section))])
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page))]
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[col (in-list (quad-elems page))]
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[block (in-list (quad-elems col))]
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[line (in-list (quad-elems block))])
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;; all inner / outer lines are initially filled as if they were right-aligned
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(define zero-filler-side (if (odd? (add1 page-idx)) "inner" "outer"))
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(when (equal? zero-filler-side (quad-ref line :line-align))
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(match (quad-elems line)
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[(cons (? filler-quad? fq) _) (set-quad-size! fq (pt 0 0))]
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[_ (void)])))
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doc)
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(define/contract (render-pdf qx-arg
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[pdf-path-arg #false]
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[base-dir-arg #false]
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#:replace [replace-existing-file? #t]
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#:compress [compress? #t])
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((qexpr?) ((or/c #false path? path-string?)
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(or/c #false path? path-string?)
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#:replace boolean? #:compress boolean?) . ->* . (or/c void? bytes?))
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;; The principal public interface to rendering.
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;; `qx-arg` is the Q-expression to be rendered.
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;; `pdf-path-arg` is the destination of the generated PDF.
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;; #false signals that we should return the PDF bytes rather than saving.
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;; `base-dir-arg` is the starting point for resolving any relative pathnames,
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;; and looking for fonts and other assets.
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(define base-dir (let ([maybe-dir (cond
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;; for reasons unclear, DrRacket sometimes sneaks
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;; an "unsaved editor" into base-dir-arg, despite efforts
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;; probably my fault
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[(equal? base-dir-arg "unsaved editor") pdf-path-arg]
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[base-dir-arg]
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[pdf-path-arg]
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[else (current-directory)])])
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(match maybe-dir
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[(? directory-exists? dir) dir]
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[_ (define-values (dir name _) (split-path maybe-dir))
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dir])))
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(unless (directory-exists? base-dir)
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(raise-argument-error 'render-pdf "existing directory" base-dir))
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(define pdf-path (setup-pdf-path pdf-path-arg))
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(unless replace-existing-file?
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(when (file-exists? pdf-path)
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(raise-argument-error 'render-pdf "path that doesn't exist" pdf-path)))
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;; `make-pdf` creates a PDF data structure using the pitfall library.
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;; this structure provides some services as we lay out the document,
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;; and then when we render, we'll rely on pitfall's PDF-drawing routines.
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(parameterize ([current-pdf (make-pdf #:compress compress?
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#:auto-first-page #false
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#:output-path pdf-path)]
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;; set `current-directory` so that ops like `path->complete-path`
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;; will be handled relative to the original directory
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[current-directory base-dir]
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;; a lot of operations need to look at pages used so it's easier to
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;; make it a parameter than endlessly pass it around as an argument.
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[section-pages-used 0]
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[verbose-quad-printing? #false]) ; for ease of debugging; not mandatory
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(define qs (time-log setup-qs (setup-qs qx-arg base-dir)))
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(setup-pdf-metadata! qs (current-pdf))
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;; all the heavy lifting happens inside `make-sections`
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;; which calls out to `make-pages`, `make-columns`, and so on.
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(define doc (correct-line-alignment (quad-copy q:doc [elems (make-sections qs)])))
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;; call `position` and `draw` separately so we can print a timer for each
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(define positioned-doc (time-log position (position doc)))
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;; drawing implies that a PDF is written to disk
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(time-log draw (draw positioned-doc (current-pdf))))
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(if pdf-path-arg
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(log-quadwriter-info (format "wrote PDF to ~a" pdf-path))
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(begin0
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(file->bytes pdf-path)
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(delete-file pdf-path))))
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