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methodize

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Matthew Butterick 5 years ago
parent 33f0c6443b
commit 8a38e41a91
1 changed files with 88 additions and 127 deletions
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215
pitfall/pitfall/document.rkt
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@ -58,129 +58,81 @@
(· this initColor)
(· this initVector)
(· this initFonts)
(inherit-field _fontFamilies)
(· this initText)
(· this initImages)
(define/public (ref [payload (mhash)])
(make-object PDFReference this (ref-gen) payload))
(as-methods
addPage
flushPages
write
addContent
_refEnd
pipe
end)
(for ([(key val) (in-hash (hash-ref options 'info (hash)))]) ; if no 'info key, nothing will be copied from (hash)
(hash-set! info key val))
;; Write the header
(write this (format "%PDF-~a" (current-pdf-version))) ; PDF version
(write this (string-append "%" (list->string (map integer->char (make-list 4 #xFF))))) ; 4 binary chars, as recommended by the spec
;; Add the first page
(when (current-auto-first-page) (addPage this)))
(define/contract (addPage this [options-arg (· this options)])
(() (hash?) . ->*m . object?)
;; end the current page if needed
(unless (hash-ref (· this options) 'bufferPages #f)
(send this flushPages))
;; create a page object
(set-field! page this (make-object PDFPage this options-arg))
(push-field! _pageBuffer this (· this page))
(define/public (write x)
(define bstr (if (not (bytes? x))
(string->bytes/latin-1 (string-append x "\n"))
x))
(set! doc-byte-strings (cons bstr doc-byte-strings))
(current-doc-offset (+ (current-doc-offset) (bytes-length bstr))))
(define/public (addPage [options-arg options])
;; end the current page if needed
(unless (hash-ref options 'bufferPages #f)
(flushPages))
;; create a page object
(set! page (make-object PDFPage this options-arg))
(push-field! _pageBuffer this page)
;; in Kids, store page dictionaries in correct order
;; this determines order in document
(define pages (· this _root payload Pages payload))
(hash-update! pages 'Kids (λ (val) (append val (list (· this page dictionary)))))
(hash-set! pages 'Count (length (hash-ref pages 'Kids)))
;; reset x and y coordinates
(set-field! x this (· this page margins left))
(set-field! y this (· this page margins top))
;; flip PDF coordinate system so that the origin is in
;; the top left rather than the bottom left
(set-field! _ctm this default-ctm-value)
(send this transform 1 0 0 -1 0 (· this page height))
this)
(define/contract (flushPages this)
(->m void?)
(define pb (· this _pageBuffer))
(for-each (λ (p) (· p end)) pb)
(set-field! _pageBuffer this empty))
(define/contract (write this x)
((or/c string? bytes?) . ->m . any/c)
(define bstr (if (not (bytes? x))
(string->bytes/latin-1 (string-append x "\n"))
x))
(push-field! doc-byte-strings this bstr)
(current-doc-offset (+ (current-doc-offset) (bytes-length bstr))))
(define/contract (addContent this data)
(any/c . ->m . object?)
(send (· this page) write data)
this)
(define/contract (offsets-missing? this)
(->m boolean?)
(positive? (length (filter (λ (v) (eq? 'missing-ref-offset v)) (hash-values (· this _offsets))))))
(define/contract (_refEnd this ref)
((is-a?/c PDFReference) . ->m . void?)
#;(report* (· ref id) (· this _offsets))
(hash-set! (· this _offsets) (· ref id) (· ref offset)))
(define/contract (pipe this port)
(port? . ->m . void?)
(set-field! output-port this port))
(define/contract (end this) ; called from source file to finish doc
(->m void?)
#;(report* 'start-end)
#;(report* (· this _offsets))
(flushPages this)
(define _info (send this ref))
(for ([(key val) (in-hash (· this info))])
;; upgrade string literal to String struct
(hash-set! (· _info payload) key (if (string? val) (String val) val)))
;; in Kids, store page dictionaries in correct order
;; this determines order in document
(define pages (· _root payload Pages payload))
(hash-update! pages 'Kids (λ (val) (append val (list (· page dictionary)))))
(hash-set! pages 'Count (length (hash-ref pages 'Kids)))
;; reset x and y coordinates
(set! x (· page margins left))
(set! y (· page margins top))
;; flip PDF coordinate system so that the origin is in
;; the top left rather than the bottom left
(set-field! _ctm this default-ctm-value)
(send this transform 1 0 0 -1 0 (· this page height))
this)
(define/public (flushPages)
(for-each (λ (p) (· p end)) _pageBuffer)
(set! _pageBuffer empty))
(define/public (addContent data)
(send page write data)
this)
(define/public (_refEnd ref)
(hash-set! _offsets (· ref id) (· ref offset)))
(define/public (pipe port)
(set! output-port port))
#;(report* (· this _offsets))
(· _info end)
(define/public (end) ; called from source file to finish doc
(flushPages)
(define _info (ref))
(for ([(key val) (in-hash info)])
;; upgrade string literal to String struct
(hash-set! (· _info payload) key (if (string? val) (String val) val)))
(for ([font (in-hash-values (· this _fontFamilies))])
(· font finalize))
(· _info end)
#;(report* (· this _offsets))
(for ([font (in-hash-values _fontFamilies)])
(· font finalize))
(· this _root end)
#;(report* (· this _offsets))
(· this _root payload Pages end)
#;(report* (· this _offsets))
(· _root end)
(· _root payload Pages end)
;; generate xref
(define xref-offset (current-doc-offset))
(with-method ([this-write (this write)])
(define sorted-offset-records (sort (hash->list (· this _offsets)) < #:key car)) ; sort by refid
;; generate xref
(define xref-offset (current-doc-offset))
(define sorted-offset-records (sort (hash->list _offsets) < #:key car)) ; sort by refid
(define this-offsets (map cdr sorted-offset-records))
(define this-idxs (map car sorted-offset-records))
(this-write "xref")
(this-write (format "0 ~a" (add1 (length this-offsets))))
(this-write "0000000000 65535 f ")
(write "xref")
(write (format "0 ~a" (add1 (length this-offsets))))
(write "0000000000 65535 f ")
(let ([missing-offsets (for/list ([offset (in-list this-offsets)]
[idx (in-list this-idxs)]
#:unless (number? offset))
@ -189,27 +141,36 @@
(raise-argument-error 'document:end "numerical offsets" missing-offsets)))
(for ([offset (in-list this-offsets)]
[idx (in-list this-idxs)])
(this-write @string-append{@(~r offset #:min-width 10 #:pad-string "0") 00000 n }))
(this-write "trailer") ;; trailer
(this-write (convert
(mhash 'Size (add1 (length this-offsets))
'Root (· this _root)
'Info _info)))
(this-write "startxref")
(this-write (number xref-offset))
(this-write "%%EOF"))
(write @string-append{@(~r offset #:min-width 10 #:pad-string "0") 00000 n }))
(write "trailer")
(write (convert
(mhash 'Size (add1 (length this-offsets))
'Root _root
'Info _info)))
(write "startxref")
(write (number xref-offset))
(write "%%EOF")
;; end the stream
;; in node you (@push null) which signals to the stream
;; to copy to its output port
;; here we'll do it manually
(define this-output-port (· this output-port))
(copy-port (open-input-bytes
(apply bytes-append (reverse (· this doc-byte-strings)))) this-output-port)
(close-output-port this-output-port))
;; end the stream
;; in node you (@push null) which signals to the stream
;; to copy to its output port
;; here we'll do it manually
(define this-output-port (· this output-port))
(copy-port (open-input-bytes
(apply bytes-append (reverse (· this doc-byte-strings)))) this-output-port)
(close-output-port this-output-port))
; if no 'info key, nothing will be copied from (hash)
(for ([(key val) (in-hash (hash-ref options 'info (hash)))])
(hash-set! info key val))
;; Write the header
(write (format "%PDF-~a" (current-pdf-version))) ; PDF version
(write (string-append "%" (list->string (map integer->char (make-list 4 #xFF))))) ; 4 binary chars, as recommended by the spec
;; Add the first page
(when (current-auto-first-page) (addPage)))
(module+ test
(define d (new PDFDocument)))
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