27 lines
1.1 KiB
Scheme
27 lines
1.1 KiB
Scheme
;; eliminate-whitespace : (listof Symbol) (Bool -> Bool) -> Element -> Element
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(define (eliminate-whitespace special eliminate-special?)
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(letrec ((blank-it
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(lambda (el)
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(let ((name (element-name el))
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(content (map (lambda (x)
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(if (element? x) (blank-it x) x))
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(element-content el))))
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(make-element
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(source-start el)
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(source-stop el)
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name
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(element-attributes el)
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(cond
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((eliminate-special? (memq (element-name el) special))
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(filter (lambda (s)
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(not (and (pcdata? s)
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(or (all-blank (pcdata-string s))
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(error 'eliminate-blanks "Element <~a> is not allowed to contain text ~s" name (pcdata-string s))))))
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content))
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(else content)))))))
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blank-it))
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;; all-blank : String -> Bool
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(define (all-blank s)
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(andmap char-whitespace? (string->list s)))
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