90 lines
2.9 KiB
Scheme
90 lines
2.9 KiB
Scheme
;;
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;;;;; html.scm - html utilities
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;;;
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;;; Copyright (c) 2012 Johan Ceuppens
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;;;
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;;; All rights reserved.
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;;;
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;;; Redistribution and use in source and binary forms, with or without
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;;; modification, are permitted provided that the following conditions
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;;; are met:
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;;; 1. Redistributions of source code must retain the above copyright
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;;; notice, this list of conditions and the following disclaimer.
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;;; 2. Redistributions in binary form must reproduce the above copyright
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;;; notice, this list of conditions and the following disclaimer in the
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;;; documentation and/or other materials provided with the distribution.
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;;; 3. The name of the authors may not be used to endorse or promote products
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;;; derived from this software without specific prior written permission.
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;;;
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;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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;;; IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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;;; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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;;; IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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;;; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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;;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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;;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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;;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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;;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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;;; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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(load "string-util.scm")
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(define (read-html-file-iter in f)
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(let ((contents ""))
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(let ((tagged 0))
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(do ((c (read-char in) (read-char in)))
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((eof-object? c)contents)
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(cond ((and (= tagged 0)(eq? c #\<))
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(set! tagged (+ tagged 1)))
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((and (> tagged 0)(eq? c #\<))
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(set! tagged (+ tagged 1)))
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((and (= tagged 0)(eq? c #\>))
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(set! tagged (- tagged 1)))
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((and (> tagged 0)(eq? c #\>))
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(set! tagged (- tagged 1)))
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((< tagged 0)
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(display "html-dump : bad html.")(newline)
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(set! tagged 0))
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)
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(set! contents (string-append contents (f c tagged)))
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))
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contents))
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(define (html-tags htmlfile)
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(let ((in (open-input-file htmlfile))
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)
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(define (f c tagged)
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(if (> tagged 0) (string c) ""))
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(read-html-file-iter in f)))
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(define (html-dump htmlfile)
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(let ((in (open-input-file htmlfile))
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)
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(define (f c tagged)
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(if (= tagged 0) (string c) ""))
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(read-html-file-iter in f)))
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;; http ripper
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;;(define (html->url url)
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;; (let ((s "")
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;; )
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;; (do ((i 0 (+ i 1)))
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;; ((or (string=? s "http://")(string=? s "ftp://")
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;; (string=? s " http://")(string=? s " ftp://"))
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;; (set! j i))
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;; (set! s (string-append s (string (string-ref url i))))
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;; )))
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