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<title>CodeMirror: Scheme mode</title>
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    <li><a href="../index.html">Language modes</a>
    <li><a class=active href="#">Scheme</a>
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<article>
<h2>Scheme mode</h2>
<form><textarea id="code" name="code">
; See if the input starts with a given symbol.
(define (match-symbol input pattern)
  (cond ((null? (remain input)) #f)
	((eqv? (car (remain input)) pattern) (r-cdr input))
	(else #f)))

; Allow the input to start with one of a list of patterns.
(define (match-or input pattern)
  (cond ((null? pattern) #f)
	((match-pattern input (car pattern)))
	(else (match-or input (cdr pattern)))))

; Allow a sequence of patterns.
(define (match-seq input pattern)
  (if (null? pattern)
      input
      (let ((match (match-pattern input (car pattern))))
	(if match (match-seq match (cdr pattern)) #f))))

; Match with the pattern but no problem if it does not match.
(define (match-opt input pattern)
  (let ((match (match-pattern input (car pattern))))
    (if match match input)))

; Match anything (other than '()), until pattern is found. The rather
; clumsy form of requiring an ending pattern is needed to decide where
; the end of the match is. If none is given, this will match the rest
; of the sentence.
(define (match-any input pattern)
  (cond ((null? (remain input)) #f)
	((null? pattern) (f-cons (remain input) (clear-remain input)))
	(else
	 (let ((accum-any (collector)))
	   (define (match-pattern-any input pattern)
	     (cond ((null? (remain input)) #f)
		   (else (accum-any (car (remain input)))
			 (cond ((match-pattern (r-cdr input) pattern))
			       (else (match-pattern-any (r-cdr input) pattern))))))
	   (let ((retval (match-pattern-any input (car pattern))))
	     (if retval
		 (f-cons (accum-any) retval)
		 #f))))))
</textarea></form>
    <script>
      var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});
    </script>

    <p><strong>MIME types defined:</strong> <code>text/x-scheme</code>.</p>

  </article>