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#lang racket/base
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(require "core.rkt")
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(require pollen/file-tools)
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(require net/url-structs net/base64 racket/file)
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(provide (all-defined-out))
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(module+ test (require rackunit))
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(define/contract (base64-font-string? x)
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(any/c . -> . boolean?)
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((->string x) . starts-with? . "data:"))
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(module+ test
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(check-true (base64-font-string? "data:foobar"))
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(check-false (base64-font-string? "foobar")))
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(define/contract (font-format p)
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(pathish? . -> . (or/c string? #f))
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(case (get-ext (->path p))
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[("eot") "embedded-opentype"]
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[("woff") "woff"]
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[("ttf" "otf") "truetype"] ; yep, in this CSS declaration, otf is considered 'truetype'
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[("svg") "svg"]
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[else #f]))
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(module+ test
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(check-equal? (font-format "foo.eot") "embedded-opentype")
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(check-equal? (font-format "foo.woff") "woff")
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(check-equal? (font-format "foo.ttf") "truetype")
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(check-equal? (font-format "foo.otf") "truetype")
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(check-equal? (font-format "foo.svg") "svg")
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(check-false (font-format "foo")))
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(define/contract (font-mime-type p)
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(pathish? . -> . (or/c string? #f))
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(case (get-ext (->path p))
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[("eot") "application/vnd.ms-fontobject"]
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[("woff") "application/font-woff"]
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[("ttf") "application/x-font-truetype"]
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[("otf") "application/x-font-opentype"]
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[("svg") "image/svg+xml"]
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[else #f]))
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(module+ test
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(check-equal? (font-mime-type "foo.eot") "application/vnd.ms-fontobject")
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(check-equal? (font-mime-type (->url "foo.woff?bar=ino")) "application/font-woff")
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(check-equal? (font-mime-type "foo.ttf") "application/x-font-truetype")
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(check-equal? (font-mime-type "foo.otf") "application/x-font-opentype")
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(check-equal? (font-mime-type "foo.svg") "image/svg+xml")
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(check-false (font-mime-type "foo")))
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(define/contract (path->base64-font-string p)
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(pathish? . -> . base64-font-string?)
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(define path (->path p))
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;; for CSS, base64 encode needs to be done with no line separator
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(format "data:~a;charset=utf-8;base64,~a" (font-mime-type p) (base64-encode (file->bytes path) #"")))
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(define/contract (font-face-declaration font-family
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src-url
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#:font-style [font-style "normal"]
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#:font-weight [font-weight "normal"]
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#:font-stretch [font-stretch "normal"]
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#:base64 [base64? #f])
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((string? (or/c urlish? base64-font-string?))
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(#:font-style string? #:font-weight string? #:font-stretch string? #:base64 boolean?)
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. ->* . string?)
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(let* [(url (->url src-url))
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(url-value (if base64? (path->base64-font-string src-url) (->path url)))
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(src (format "url('~a') format('~a')" url-value (font-format src-url)))]
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(string-append "@font-face {\n"
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(join-css-strings (map make-css-string
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'(font-family font-style font-weight font-stretch src)
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(list font-family font-style font-weight font-stretch src)))
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"}")))
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(define ffd font-face-declaration)
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(module+ main
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(display (ffd "Miso" "charter-regular.woff" #:font-style "italic" #:font-weight "700" #:base64 #t)))
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