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78 lines
2.5 KiB
HTML
78 lines
2.5 KiB
HTML
<!doctype html>
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<title>CodeMirror: Scheme mode</title>
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<meta charset="utf-8"/>
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<link rel=stylesheet href="../../doc/docs.css">
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<link rel="stylesheet" href="../../lib/codemirror.css">
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<script src="../../lib/codemirror.js"></script>
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<script src="scheme.js"></script>
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<style>.CodeMirror {background: #f8f8f8;}</style>
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<div id=nav>
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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="../../index.html">Home</a>
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<li><a href="../../doc/manual.html">Manual</a>
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<li><a href="https://github.com/codemirror/codemirror">Code</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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<article>
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<h2>Scheme mode</h2>
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<form><textarea id="code" name="code">
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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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<script>
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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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