You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
157 lines
6.9 KiB
Racket
157 lines
6.9 KiB
Racket
#lang racket/base
|
|
(require racket/string racket/list)
|
|
(require (planet mb/pollen/readability))
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; CSS Helper functions.
|
|
; use these either in CSS style block,
|
|
; or inline style.
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(define css-property-prefixes '("-moz-" "-webkit-" "-o-" "-ms-" ""))
|
|
|
|
(define (join-css-strings properties)
|
|
(define line-ending ";\n")
|
|
(define out-string (string-join properties line-ending))
|
|
(if (ends-with? out-string line-ending) ; might already have the line ending, so don't duplicate it
|
|
out-string
|
|
(string-append out-string line-ending)))
|
|
|
|
(define (make-css-strings property-prefixes property-suffix values)
|
|
; general function for creating groups of css properties
|
|
; with browser prefixes and one value
|
|
(define (map-suffix suffix prefixes)
|
|
(map (λ(prefix) (string-append prefix suffix)) prefixes))
|
|
|
|
(define (join-css-prop-and-value p v)
|
|
(string-join (list (->string p) (->string v)) ": "))
|
|
|
|
(define properties (map-suffix property-suffix property-prefixes))
|
|
|
|
; if single value provided, convert to list of values
|
|
; so that it will work with map in the next step
|
|
(when (not (list? values))
|
|
(set! values (make-list (len properties) values)))
|
|
|
|
(map join-css-prop-and-value properties values))
|
|
|
|
(define (make-css-columns #:count count #:gap [gap #f])
|
|
; shorthand for css column declaration
|
|
(join-css-strings (append
|
|
(make-css-strings css-property-prefixes "column-count" count)
|
|
(if gap
|
|
(make-css-strings css-property-prefixes "column-gap" gap)
|
|
empty))))
|
|
|
|
(define (make-css-avoid-column-break-inside)
|
|
; this gets applied to list items to keep them from breaking across columns
|
|
; however it doesn't work in Firefox due to bug; workaround is stupid
|
|
(join-css-strings (append
|
|
(make-css-strings css-property-prefixes "column-break-inside" "avoid")
|
|
(make-css-strings css-property-prefixes "break-inside" "avoid-column"))))
|
|
|
|
(define (make-css-transition property duration #:timing-function [timing-function #f] #:delay [delay #f])
|
|
(define transition-prefixes '("-moz-" "-webkit-" ""))
|
|
(join-css-strings (append
|
|
(make-css-strings transition-prefixes "transition-property" property)
|
|
(make-css-strings transition-prefixes "transition-duration" duration)
|
|
(if timing-function
|
|
(make-css-strings transition-prefixes "transition-timing-function" timing-function)
|
|
empty)
|
|
(if delay
|
|
(make-css-strings transition-prefixes "transition-delay" delay)
|
|
empty))))
|
|
|
|
|
|
(define (make-css-ot-features feature-tags [feature-values 1])
|
|
; if single value provided, upconvert to list
|
|
(when (not (list? feature-tags))
|
|
(set! feature-tags (list feature-tags)))
|
|
|
|
; same here: convert single value into list
|
|
(when (not (list? feature-values))
|
|
(let ([single-value feature-values])
|
|
(set! feature-values (make-list (len feature-tags) single-value))))
|
|
|
|
; use single quotes in the formatter because css string might be used in an inline tag
|
|
; with form style="[string]" so double quotes are irritating
|
|
(define feature-tag-string (string-join (map (λ(tag value) (format "'~a' ~a" tag value)) feature-tags feature-values) ", "))
|
|
|
|
; I hate accommodating old browsers but I'll make an exception because OT support is
|
|
; critical to most MB projects
|
|
; if this comes before new-style -moz- declaration, it will work for all.
|
|
(define feature-tag-string-old-firefox (string-join (map (λ(tag value) (format "'~a=~a'" tag value)) feature-tags feature-values) ", "))
|
|
|
|
(define feature-tag-property "font-feature-settings")
|
|
|
|
(join-css-strings (append
|
|
(make-css-strings '("-moz-") feature-tag-property feature-tag-string-old-firefox)
|
|
(make-css-strings css-property-prefixes feature-tag-property feature-tag-string))))
|
|
|
|
|
|
(define (make-css-hyphens [value "auto"])
|
|
(join-css-strings (make-css-strings css-property-prefixes "hyphens" value)))
|
|
|
|
(define (make-css-background-gradient colors [stops #f] #:radial [radial #f] #:horizontal [horizontal #f])
|
|
; this doesn't handle old-style webkit syntax. todo: add it? I think I don't care
|
|
|
|
; check inputs for failure
|
|
(when (or (not (list? colors)) (< (len colors) 2))
|
|
(error "Not enough colors to make gradient in" colors))
|
|
(when (and stops (< (len stops) (len colors)))
|
|
(error "Not enough stops for given number of colors in" stops))
|
|
|
|
(when (not stops) ; distribute colors evenly between 0 and 100
|
|
; new-stops is range of steps incremented properly and rounded to int, then append 100 to end
|
|
(let ([new-stops `(,@(map ->int (range 0 100 (/ 100 (sub1 (len colors))))) 100)])
|
|
; convert to list of percentages
|
|
(set! stops (map (λ(x) (format "~a%" x)) new-stops))))
|
|
|
|
; color / percentage pairs separated by commas
|
|
(define color-stop-string (string-join (map (λ(color stop) (format "~a ~a" color stop)) colors stops) ", "))
|
|
|
|
; set up gradient options
|
|
(define gradient-type (if radial "radial" "linear"))
|
|
(define gradient-direction (if horizontal "left" "top"))
|
|
|
|
; can't use standard make-css-strings in this case because the prefixes appear in the value,
|
|
; not in the property (which is always "background")
|
|
(define gradient-strings (map (λ(prefix) (format "background: ~a~a-gradient(~a, ~a)" prefix gradient-type gradient-direction color-stop-string)) css-property-prefixes))
|
|
|
|
; just fill with the last color if gradient not available
|
|
(define fallback-string (format "background: ~a" (last colors)))
|
|
|
|
; put fallback string at front of list
|
|
(join-css-strings (cons fallback-string gradient-strings)))
|
|
|
|
|
|
(define (make-css-small-caps)
|
|
(join-css-strings (list "text-transform: lowercase" (make-css-ot-features "c2sc"))))
|
|
|
|
(define (make-css-caps)
|
|
(join-css-strings (list "text-transform: uppercase" (make-css-ot-features "case"))))
|
|
|
|
(define (make-css-kerning)
|
|
(join-css-strings (list "text-rendering: optimizeLegibility" (make-css-ot-features "kern"))))
|
|
|
|
|
|
(define (make-css-ligatures)
|
|
(join-css-strings (list "text-rendering: optimizeLegibility" (make-css-ot-features "liga"))))
|
|
|
|
|
|
|
|
; editability can't be handled as pure css because firefox requires extra content-editable attribute.
|
|
; does it still? todo: further research, maybe this can be css only.
|
|
(define (editable . stuff)
|
|
(define editable-string (make-css-editable))
|
|
`(div ((style ,editable-string)(contenteditable "true")) ,@stuff))
|
|
|
|
(define (make-css-editable)
|
|
(join-css-strings (list "user-modify: read-write"
|
|
"-moz-user-modify: read-write"
|
|
"-webkit-user-modify: read-write-plaintext-only"
|
|
"outline-style: none")))
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(provide (all-defined-out)) |