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74 lines
3.4 KiB
Racket
74 lines
3.4 KiB
Racket
#lang racket/base
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(require sugar/define sugar/test txexpr/base pollen/private/splice pollen/setup)
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(define (trim-outer-tag html)
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(define matches (regexp-match #px"^<.*?>(.*)</.*?>$" html))
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(define paren-match (cadr matches))
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paren-match)
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(define (has-outer-splice-tag? x)
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(and (pair? x) (eq? (get-tag x) pollen-splicing-tag)))
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(define+provide/contract (->html x-arg-maybe-spliced
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#:tag [tag #f]
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#:attrs [attrs #f]
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#:splice? [new-splice-arg? #f]
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#:splice [backward-compatible-splice-arg? #f])
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(((or/c txexpr-element? txexpr-elements?))
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(#:tag (or/c #f txexpr-tag?)
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#:attrs (or/c #f txexpr-attrs?)
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#:splice? boolean?
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#:splice boolean?) . ->* . string?)
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;; handle an outer splice tag specially, because `splice` will leave it
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(define x-arg (if (has-outer-splice-tag? x-arg-maybe-spliced)
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(cdr x-arg-maybe-spliced)
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x-arg-maybe-spliced))
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;; x is an X-expression
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(define x (if (list? x-arg)
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(splice (if (txexpr? x-arg)
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x-arg
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(cons 'html x-arg)) pollen-splicing-tag) ; list of txexpr-elements
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x-arg))
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(when (and (not (txexpr? x)) attrs (not tag))
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(raise-argument-error '->html "can't use attribute list without a #:tag argument" tag))
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(define splice? (or new-splice-arg? backward-compatible-splice-arg?))
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(cond
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[(or tag (txexpr? x))
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(define html-tag (or tag (get-tag x)))
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(define html-attrs (or attrs (and (txexpr? x) (get-attrs x)) null))
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(define html-elements (or (and (txexpr? x) (get-elements x)) (list x)))
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(define html (xexpr->html (txexpr html-tag html-attrs html-elements)))
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(if (or splice? (and (list? x-arg) (not (txexpr? x-arg)) (not tag)))
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(trim-outer-tag html)
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html)]
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[else (xexpr->html x)]))
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(module-test-external
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(require txexpr)
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(define tx '(root (p "hello")))
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(check-equal? (->html tx) "<root><p>hello</p></root>")
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(check-equal? (->html #:tag 'brennan tx) "<brennan><p>hello</p></brennan>")
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(check-equal? (->html #:attrs '((id "dale")) tx) "<root id=\"dale\"><p>hello</p></root>")
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(check-equal? (->html #:splice? #t tx) "<p>hello</p>")
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(check-equal? (->html #:tag 'brennan #:attrs '((id "dale")) tx) "<brennan id=\"dale\"><p>hello</p></brennan>")
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(check-equal? (->html #:tag 'brennan #:attrs '((id "dale")) #:splice #t tx) "<p>hello</p>")
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(define x "hello")
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(check-equal? (->html x) "hello")
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(check-equal? (->html #:tag 'brennan x) "<brennan>hello</brennan>")
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(check-exn exn:fail? (λ () (->html #:attrs '((id "dale")) x) "hello")) ;; won't work without tag
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(check-equal? (->html #:splice? #t x) "hello")
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(check-equal? (->html #:tag 'brennan #:attrs '((id "dale")) x) "<brennan id=\"dale\">hello</brennan>")
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(check-equal? (->html #:tag 'brennan #:attrs '((id "dale")) #:splice? #t x) "hello")
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(define xs '("hello " (em "you") " " 42))
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(check-equal? (->html xs) "hello <em>you</em> *")
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(check-equal? (->html #:splice? #t xs) "hello <em>you</em> *")
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(check-equal? (->html #:tag 'div xs) "<div>hello <em>you</em> *</div>")
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(check-equal? (->html '(@ "Markup in " (@ "italic"))) "Markup in italic")
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(check-equal? (->html '("Markup in " (@ "italic"))) "Markup in italic")
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(check-equal? (->html `(div "<![CDATA[Foo < Bar]]>")) "<div><![CDATA[Foo < Bar]]></div>"))
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