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57 lines
2.7 KiB
Racket
57 lines
2.7 KiB
Racket
#lang racket/base
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(require sugar txexpr racket/list racket/string pollen/world xml html racket/file racket/match pollen/html net/url racket/port)
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(define (attrs->pollen attrs)
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(string-join (flatten (map (λ(pair) (list (format "'~a:" (car pair)) (format "\"~a\"" (cadr pair)))) attrs)) " "))
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(define/contract+provide (xexpr->pollen x #:p-breaks [p-breaks #f])
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((xexpr?) (#:p-breaks boolean?) . ->* . string?)
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(let loop ([x x])
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(cond
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[(and p-breaks (txexpr? x) (equal? (car x) 'p) (apply string-append `("\n" ,@(map ->string (map loop (get-elements x))) "\n")))]
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[(txexpr? x) (apply string-append
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(map ->string `(,(world:current-command-char) ,(get-tag x)
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,@(if (not (null? (get-attrs x))) `("[" ,(attrs->pollen (get-attrs x)) "]") null)
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,@(if (not (null? (get-elements x))) `("{" ,@(map loop (get-elements x)) "}" ) null))))]
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[(symbol? x) (loop (entity->integer x))]
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[(number? x) (format "~a" (integer->char x))]
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[else x])))
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(define/contract+provide (html->xexpr html-string)
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(string? . -> . xexpr?)
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(use-html-spec #f)
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(define xexpr-results
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(let loop ([elem (read-html-as-xml (open-input-string html-string))])
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(match elem
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[(struct pcdata (start stop string)) string]
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[(struct entity (start stop entity)) entity]
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[(struct attribute (start stop key value)) (list key value)]
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[(struct element (start stop name attributes content)) `(,name ,@(if (empty? attributes) empty (list (map loop attributes))) ,@(map loop content))]
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[(list elements ...) (map loop elements)]
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[else (format "unknown item: ~a" elem)])))
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; xexpr-results will be a list with whitespace elements, so strip those out
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(car (filter-not (λ(x) (and (string? x) (regexp-match #px"\\s+" x))) xexpr-results)))
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(define/contract+provide (html->pollen html-string #:p-breaks [p-breaks #f])
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((string?) (#:p-breaks boolean?) . ->* . string?)
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(xexpr->pollen #:p-breaks p-breaks (html->xexpr html-string)))
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(define/contract+provide (url->pollen url-or-string #:p-breaks [p-breaks #f])
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(((or/c string? url?)) (#:p-breaks boolean?) . ->* . string?)
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(define url (if (string? url-or-string) (string->url url-or-string) url-or-string))
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(define url-result (port->string (get-pure-port url)))
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(html->pollen url-result #:p-breaks p-breaks))
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(module+ main
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; (xexpr->pollen '(p "You are puppy"))
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; (xexpr->pollen '(p ((class "foo")) "You are puppy"))
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; (xexpr->pollen '(p ((class "foo")) "You are" "\n\n" "puppy"))
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; (xexpr->pollen '(p ((class "foo")) "You are " (em "so") " puppy"))
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; (display (html->pollen #:p-breaks #t (file->string "index.html"))))
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) |