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93 lines
2.6 KiB
Racket
93 lines
2.6 KiB
Racket
#lang racket/base
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(require racket/match racket/port racket/dict)
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(provide (all-defined-out))
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;; structs
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(struct pdf (options
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pages
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refs
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root
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info
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opacity-registry
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current-fill-color
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ctm
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ctm-stack
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font-families
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current-font-features
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current-font-size
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current-font
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registered-fonts
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line-gap
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x
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y
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image-registry) #:transparent #:mutable)
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;; for JPEG and PNG
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(struct $img (data label width height ref embed-proc) #:transparent #:mutable)
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;; for reference
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(struct $ref (id payload offset port) #:transparent #:mutable
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#:methods gen:dict
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[(define (dict-ref $ key [thunk (λ () (error 'dict-ref-key-not-found))])
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(hash-ref ($ref-payload $) key))
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(define (dict-ref! $ key thunk)
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(hash-ref! ($ref-payload $) key thunk))
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(define (dict-set! $ key val) (hash-set! ($ref-payload $) key val))
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(define (dict-update! $ key updater [failure-result (λ () (error 'update-no-key))])
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(hash-update! ($ref-payload $) key updater failure-result))])
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;; for page
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(struct margin (top left bottom right) #:transparent #:mutable)
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;; params
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(define test-mode (make-parameter #f))
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(define current-compress-streams? (make-parameter #f))
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(define current-pdf-version (make-parameter 1.3))
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(define current-auto-first-page (make-parameter #t))
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(define current-auto-helvetica (make-parameter #t))
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(define current-default-margins (make-parameter (margin 72 72 72 72)))
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(define current-font (make-parameter #f))
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(define current-font-size (make-parameter 12))
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;; helpers
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(define (numberizer x #:round [round? #true])
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(unless (and (number? x) (< -1e21 x 1e21))
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(raise-argument-error 'number "valid number" x))
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(let ([x (if round? (/ (round (* x 1e6)) 1e6) x)])
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(number->string (if (integer? x)
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(inexact->exact x)
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x))))
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(define (to-bytes x)
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(match x
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[(? bytes?) x]
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[(? input-port?) (port->bytes x)]
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[_ (string->bytes/latin-1 (string-append x "\n"))]))
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(define (write-bytes-out x)
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(void (write-bytes (to-bytes x))))
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(define (bounded low x high)
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(if (high . < . low)
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(bounded high x low)
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(max low (min high x))))
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(module+ test
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(require rackunit)
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(check-equal? (bounded 0 2 1) 1)
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(check-equal? (bounded 1 2 0) 1)
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(check-equal? (bounded 0 -2 1) 0)
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(check-equal? (bounded 1 -2 0) 0)
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(check-equal? (bounded 0 .5 1) 0.5)
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(check-equal? (bounded 0 0 1) 0)
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(check-equal? (bounded 0 1 1) 1))
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