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88 lines
3.5 KiB
Racket
88 lines
3.5 KiB
Racket
#lang debug racket/base
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(require racket/match
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racket/string)
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(provide (all-defined-out))
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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 (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-points 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|ches)?") 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)]) (string->number num-string))])]))
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(if round? (inexact->exact (floor val)) val))
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(define 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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clip ; whether box boundary clips its contents
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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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)) |