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pollen/pollen/unstable/convert.rkt

95 lines
4.1 KiB
Racket

#lang racket/base
(require sugar
txexpr/base
racket/list
racket/string
pollen/setup
xml
html
racket/match
"html.rkt"
pollen/unstable/typography
net/url
racket/port)
(module+ test
(require rackunit))
(define (attrs->pollen-attrs attrs)
(string-join (for*/list ([attr (in-list attrs)]
[k (in-value (car attr))]
[v (in-value (cadr attr))])
(format "#:~a ~v" k v)) " "))
(define/contract+provide (xexpr->pollen x #:white-p? [white-p? #f])
((xexpr?) (#:white-p? boolean?) . ->* . string?)
(let loop ([x x])
(cond
[(and white-p? (txexpr? x) (eq? (car x) 'p) (empty? (get-attrs x))
(string-append* (list* (setup:paragraph-separator) (map ->string (map loop (get-elements x))))))]
[(and (txexpr? x)
(or (not (empty? (get-attrs x)))
(not (empty? (get-elements x)))))
(string-append* (map ->string `(,(setup:command-char)
,(get-tag x)
,@(if (pair? (get-attrs x)) `("[" ,(attrs->pollen-attrs (get-attrs x)) "]") null)
,@(if (pair? (get-elements x)) `("{" ,@(map loop (get-elements x)) "}" ) null))))]
[(txexpr? x) ; no attrs or tag, so needs parens
(format "~a(~a)" (setup:command-char) (get-tag x))]
[(symbol? x) (loop (entity->integer x))]
[(number? x) (format "~a" (integer->char x))]
[else x])))
(module+ test
(check-equal? (xexpr->pollen '(p "You are puppy")) "◊p{You are puppy}")
(check-equal? (xexpr->pollen '(div (p "You are puppy") (p "You are kitty"))) "◊div{◊p{You are puppy}◊p{You are kitty}}")
(check-equal? (xexpr->pollen #:white-p? #t '(div (p "You are puppy") (p "You are kitty"))) "◊div{
You are puppy
You are kitty}")
(check-equal? (xexpr->pollen '(p ((class "foo")) "You are puppy")) "◊p[#:class \"foo\"]{You are puppy}")
(check-equal? (xexpr->pollen '(p)) "◊(p)")
(check-equal? (xexpr->pollen '(p ((class "foo")) "You are " (em "so") " puppy")) "◊p[#:class \"foo\"]{You are ◊em{so} puppy}"))
(define (conjoin . fs)
(λ (x) (andmap (λ (f) (f x)) fs)))
(define/contract+provide (html->xexpr . html-strings)
(() () #:rest (listof string?) . ->* . xexpr?)
(use-html-spec #f)
(define html-string (string-join html-strings ""))
(define xexpr-results
; loop result will be a list with whitespace elements, so strip those out
(filter-not (conjoin string? whitespace?)
(let loop ([elem (read-html-as-xml (open-input-string html-string))])
(match elem
[(struct pcdata (start stop string)) string]
[(struct entity (start stop entity)) entity]
[(struct attribute (start stop key value)) (list key value)]
[(struct element (start stop name attributes content)) `(,name ,@(if (empty? attributes) empty (list (map loop attributes))) ,@(map loop content))]
[(list elements ...) (map loop elements)]
[else (format "unknown item: ~a" elem)]))))
(if (pair? xexpr-results) (car xexpr-results) ""))
(module+ test
(define (hx-identity xexpr)
(equal? (html->xexpr (xexpr->html xexpr)) xexpr))
(check-true (hx-identity '(p "You are puppy")))
(check-true (hx-identity '(p ((class "foo")) "You are puppy")))
(check-true (hx-identity '(p)))
(check-true (hx-identity '(p ((class "foo")) "You are " (em "so") " puppy")))
(check-equal? (html->xexpr "\n") ""))
(define/contract+provide (html->pollen #:white-p? [white-p? #f] . html-strings)
(() (#:white-p? boolean?) #:rest (listof string?) . ->* . string?)
(xexpr->pollen #:white-p? white-p? (apply html->xexpr html-strings)))
(define/contract+provide (url->pollen url-or-string #:white-p? [white-p? #f])
(((or/c string? url?)) (#:white-p? boolean?) . ->* . string?)
(define url (if (string? url-or-string) (string->url url-or-string) url-or-string))
(define url-result (port->string (get-pure-port url)))
(html->pollen url-result #:white-p? white-p?))