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147 lines
5.5 KiB
Racket
147 lines
5.5 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))
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(define (parse-dimension x [round? #f])
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(define val
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(match x
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[(? number?) x]
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[(? string? x)
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(match (cdr (regexp-match #rx"^(-?[0-9\\.]+)([a-z]+)$" (string-downcase x)))
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[(list num-string unit)
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((match unit
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[(regexp #rx"in(ch(es)?)?$") in->pts]
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[(regexp #rx"cm$") (compose1 in->pts cm->in)]
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[(regexp #rx"mm$") (compose1 in->pts cm->in mm->cm)]
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[_ (raise-argument-error 'parse-dimension "dimension string" x)]) (string->number num-string))])]))
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(if round? (inexact->exact (floor val)) val))
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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 (in-list block-attrs)]
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[v (in-value (hash-ref source-hash k #f))]
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#:when v)
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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-size
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font-size-adjust
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font-color
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font-features
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font-italic
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font-bold
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character-tracking
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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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(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-all-lines
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keep-with-next
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line-align
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line-align-last
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first-line-indent
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line-wrap
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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-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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footer-display)) |