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246 lines
8.8 KiB
Racket
246 lines
8.8 KiB
Racket
#lang debug racket/base
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(require (for-syntax racket/base racket/syntax syntax/strip-context)
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racket/match
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racket/sequence
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racket/string)
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(provide (all-defined-out))
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(define (list->attrs . kvs)
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(for/list ([kv (in-slice 2 kvs)])
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kv))
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(define (cm->in x) (/ x 2.54))
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(define (in->pts x) (* 72 x))
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(define (mm->cm x) (/ x 10.0))
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(define (parse-dimension x [em-resolution-attrs #false])
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(match x
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[#false #false]
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[(? number? num) num]
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[(? string? str)
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(match (regexp-match #px"^(-?[0-9\\.]+)\\s*([a-z]+)$" (string-downcase str))
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[#false str] ; a string other than a dimension string, so leave it
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[(list str num-string unit)
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((match unit
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[(regexp #rx"(pt|point)(s)?$") values] ; points
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[(regexp #rx"in(ch(es)?)?$") in->pts] ; inches
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[(regexp #rx"cms?$") (compose1 in->pts cm->in)] ; cm
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[(regexp #rx"mms?$") (compose1 in->pts cm->in mm->cm)] ; mm
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[(regexp #rx"ems?$") (if em-resolution-attrs
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(λ (num) (* (hash-ref em-resolution-attrs :font-size) num))
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;; if we don't have attrs for resolving the em string, we leave it alone
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(λ (num) str))] ; em
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[_ (raise-argument-error 'parse-dimension "dimension string" str)]) (string->number num-string))])]))
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(define (copy-block-attrs source-hash dest-hash)
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(define new-hash (make-hasheq))
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(for ([(k v) (in-hash dest-hash)])
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(hash-set! new-hash k v))
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(for ([(k v) (in-hash source-hash)]
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#:when (memq k block-attrs))
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(hash-set! new-hash k v))
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new-hash)
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(define-syntax (define-attrs stx)
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(syntax-case stx ()
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[(_ (ATTR-NAME ...))
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(with-syntax ([(ATTR-ID ...) (for/list ([attr-id (in-list (syntax->list #'(ATTR-NAME ...)))])
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(format-id stx ":~a" (syntax-e attr-id)))])
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#'(begin
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(define ATTR-ID 'ATTR-NAME) ...))]
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[(_ ID (ATTR-NAME ...))
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(replace-context stx
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#'(begin
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(define ID (list 'ATTR-NAME ...))
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(define-attrs (ATTR-NAME ...))))]))
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#|
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Naming guidelines
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+ shorter is better
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+ general to specific: border-color-left, not border-left-color or left-border-color
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+ don't refer to specific output format, e.g. PDF or HTML
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+ consistency with CSS style property names is OK if the concept is mostly the same, but usually it's not
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+ default value for any missing attr is #false
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+ measurement units are points by default
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|#
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(define-attrs (font-family
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font-path
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font-size
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font-color
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font-features
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font-features-adjust
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font-italic
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font-bold
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font-tracking
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font-baseline-shift
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font-case
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bg
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link
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href
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line-height
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hyphenate
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list-index
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no-colbr
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no-pbr
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page-number
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doc-title
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pdf-title
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pdf-subject
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pdf-author
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pdf-keywords
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break
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draw
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width
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height
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anchor-parent
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anchor-from
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anchor-from-parent
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anchor-to
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string
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color
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stroke
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x
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y
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x1 ;; x & y are the top-left pos of the bounding box.
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y1 ;; x1 & y1 are the starting points of a line
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x2
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y2))
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(define-attrs block-attrs (display
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;; inset values increase the layout size of the quad.
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;; they are relative to the natural layout box.
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inset-top
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inset-bottom
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inset-left
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inset-right
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;; border-inset values do not increase the layout size of the quad.
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;; they are relative to the layout size of the quad, with inset values included.
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;; this is different from CSS, where margin + padding increase the size of the layout.
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;; one has to be dependent on the other, so a choice must be made.
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;; I find this approach more sensible because
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;; borders are a styling element, not a layout element.
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;; this means that changing the inset values will change the position of the border.
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;; but this is preferable to the CSS model, where moving the border changes the layout.
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;; principle: minimize the number of values that affect the layout,
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;; so it's easier to reason about programmatically.
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border-inset-top
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border-inset-bottom
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border-inset-left
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border-inset-right
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border-width-left
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border-width-right
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border-width-top
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border-width-bottom
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border-color-left
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border-color-right
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border-color-top
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border-color-bottom
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background-color
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block-clip ; whether box boundary clips its contents
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space-after ; space after a block, like a paragraph
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space-before
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column-count
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column-gap
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keep-first-lines
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keep-last-lines
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keep-with-next
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line-align
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first-line-indent
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line-wrap
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image-file
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image-object
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image-alt
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image-height
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image-width
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page-width
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page-height
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page-size ; e.g., "letter"
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page-orientation ; only applies to page-size dimensions
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page-number-start ; 1
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page-side-start ; 'right
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page-margin-top
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page-margin-bottom
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page-margin-left
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page-margin-right
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page-margin-gutter
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footer-display
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footer-text
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;; we want this distinct from anchor-parent
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;; because the two directives may overlap / contradict.
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;; for instance: repeat on every page,
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;; a quad that prints on the previous page on the second line.
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repeat
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draw-debug
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fn-ref
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fn-text
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fn-text-start))
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(define (takes-dimension-string? k)
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(and (memq k (list :page-width
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:page-height
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:page-margin-top
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:page-margin-bottom
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:page-margin-left
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:page-margin-right
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:page-margin-gutter
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:column-gap
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:inset-top
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:inset-bottom
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:inset-left
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:inset-right
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:border-inset-top
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:border-inset-bottom
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:border-inset-left
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:border-inset-right
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:border-width-left
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:border-width-right
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:border-width-top
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:border-width-bottom
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:space-before
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:space-after
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:image-height
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:image-width
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:font-size
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:font-tracking
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:font-baseline-shift
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:line-height
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:x
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:y
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:x2
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:y2
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:width)) #true))
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(define (has-case-sensitive-value? k)
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(and (memq k (list :pdf-title
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:pdf-subject
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:pdf-author
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:pdf-keywords
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:string)) #true))
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(define (takes-path? k)
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(and (memq k (list :image-file)) #true))
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