make `->html` cooperate with splicing tag

pull/127/head
Matthew Butterick 8 years ago
parent a909b73637
commit 5ff7f1cb6d

@ -1 +1 @@
1470423896
1470764178

@ -1,30 +1,40 @@
#lang racket/base
(require sugar/define sugar/test txexpr/base)
(require sugar/define sugar/test txexpr/base pollen/private/splice)
(define (trim-outer-tag html)
(define matches (regexp-match #px"^<.*?>(.*)</.*?>$" html))
(define paren-match (cadr matches))
paren-match)
(define (has-outer-splice-tag? x)
(and (pair? x) (eq? (get-tag x) splice-signal-tag)))
(define+provide/contract (->html x-arg #:tag [tag #f] #:attrs [attrs #f] #:splice? [splice? #f] #:splice [bwc-splice? #f])
(define+provide/contract (->html x-arg-maybe-spliced #:tag [tag #f] #:attrs [attrs #f] #:splice? [new-splice-arg? #f] #:splice [backward-compatible-splice-arg? #f])
(((or/c txexpr-element? txexpr-elements?)) (#:tag (or/c #f txexpr-tag?) #:attrs (or/c #f txexpr-attrs?) #:splice? boolean? #:splice boolean?) . ->* . string?)
(define x (cond
[(txexpr? x-arg) x-arg]
[(list? x-arg) (cons 'html x-arg)]
[else x-arg]))
;; handle an outer splice tag specially, because `splice` will leave it
(define x-arg (if (has-outer-splice-tag? x-arg-maybe-spliced)
(cdr x-arg-maybe-spliced)
x-arg-maybe-spliced))
;; x is an X-expression
(define x (if (list? x-arg)
(splice (if (txexpr? x-arg)
x-arg
(cons 'html x-arg))) ; list of txexpr-elements
x-arg))
(when (and (not (txexpr? x)) attrs (not tag))
(raise-argument-error '->html "can't use attribute list without a #:tag argument" tag))
(define splice? (or new-splice-arg? backward-compatible-splice-arg?))
(cond
[(or tag (txexpr? x))
(define html-tag (or tag (get-tag x)))
(define html-attrs (or attrs (and (txexpr? x) (get-attrs x)) null))
(define html-elements (or (and (txexpr? x) (get-elements x)) (list x)))
(define html (xexpr->html (txexpr html-tag html-attrs html-elements)))
(if (or splice? bwc-splice? (and (list? x-arg) (not (txexpr? x-arg)) (not tag)))
(if (or splice? (and (list? x-arg) (not (txexpr? x-arg)) (not tag)))
(trim-outer-tag html)
html)]
[else (xexpr->html x)]))
@ -48,4 +58,6 @@
(define xs '("hello " (em "you") " " 42))
(check-equal? (->html xs) "hello <em>you</em> &#42;")
(check-equal? (->html #:splice? #t xs) "hello <em>you</em> &#42;")
(check-equal? (->html #:tag 'div xs) "<div>hello <em>you</em> &#42;</div>"))
(check-equal? (->html #:tag 'div xs) "<div>hello <em>you</em> &#42;</div>")
(check-equal? (->html '(@ "Markup in " (@ "italic"))) "Markup in italic")
(check-equal? (->html '("Markup in " (@ "italic"))) "Markup in italic"))

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