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<title>CodeMirror: Scheme mode</title>

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<a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>

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<ul>

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<li><a href="../../doc/manual.html">Manual</a>

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</ul>

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<ul>

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<li><a href="../index.html">Language modes</a>

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<li><a class=active href="#">Scheme</a>

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</ul>

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</div>

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<h2>Scheme mode</h2>

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; See if the input starts with a given symbol.

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(define (match-symbol input pattern)

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(cond ((null? (remain input)) #f)

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((eqv? (car (remain input)) pattern) (r-cdr input))

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(else #f)))

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; Allow the input to start with one of a list of patterns.

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(define (match-or input pattern)

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(cond ((null? pattern) #f)

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((match-pattern input (car pattern)))

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(else (match-or input (cdr pattern)))))

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; Allow a sequence of patterns.

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(define (match-seq input pattern)

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(if (null? pattern)

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input

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(let ((match (match-pattern input (car pattern))))

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(if match (match-seq match (cdr pattern)) #f))))

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; Match with the pattern but no problem if it does not match.

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(define (match-opt input pattern)

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(let ((match (match-pattern input (car pattern))))

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(if match match input)))

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; Match anything (other than '()), until pattern is found. The rather

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; clumsy form of requiring an ending pattern is needed to decide where

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; the end of the match is. If none is given, this will match the rest

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; of the sentence.

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(define (match-any input pattern)

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(cond ((null? (remain input)) #f)

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((null? pattern) (f-cons (remain input) (clear-remain input)))

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(else

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(let ((accum-any (collector)))

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(define (match-pattern-any input pattern)

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(cond ((null? (remain input)) #f)

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(else (accum-any (car (remain input)))

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(cond ((match-pattern (r-cdr input) pattern))

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(else (match-pattern-any (r-cdr input) pattern))))))

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(let ((retval (match-pattern-any input (car pattern))))

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(if retval

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(f-cons (accum-any) retval)

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#f))))))

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</textarea></form>

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var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});

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</script>

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

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</article>

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