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- <!doctype html>
- <title>CodeMirror: Scheme mode</title>
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- <ul>
- <li><a href="../index.html">Language modes</a>
- <li><a class=active href="#">Scheme</a>
- </ul>
- </div>
- <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>
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