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1 <!doctype html>
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2
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3 <title>CodeMirror: Scheme mode</title>
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4 <meta charset="utf-8"/>
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5 <link rel=stylesheet href="../../doc/docs.css">
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6
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7 <link rel="stylesheet" href="../../lib/codemirror.css">
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8 <script src="../../lib/codemirror.js"></script>
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9 <script src="scheme.js"></script>
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10 <style>.CodeMirror {background: #f8f8f8;}</style>
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11 <div id=nav>
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12 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
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13
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14 <ul>
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15 <li><a href="../../index.html">Home</a>
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16 <li><a href="../../doc/manual.html">Manual</a>
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17 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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18 </ul>
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19 <ul>
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20 <li><a href="../index.html">Language modes</a>
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21 <li><a class=active href="#">Scheme</a>
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22 </ul>
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23 </div>
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24
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25 <article>
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26 <h2>Scheme mode</h2>
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27 <form><textarea id="code" name="code">
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28 ; See if the input starts with a given symbol.
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29 (define (match-symbol input pattern)
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30 (cond ((null? (remain input)) #f)
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31 ((eqv? (car (remain input)) pattern) (r-cdr input))
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32 (else #f)))
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33
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34 ; Allow the input to start with one of a list of patterns.
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35 (define (match-or input pattern)
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36 (cond ((null? pattern) #f)
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37 ((match-pattern input (car pattern)))
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38 (else (match-or input (cdr pattern)))))
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39
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40 ; Allow a sequence of patterns.
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41 (define (match-seq input pattern)
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42 (if (null? pattern)
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43 input
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44 (let ((match (match-pattern input (car pattern))))
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45 (if match (match-seq match (cdr pattern)) #f))))
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46
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47 ; Match with the pattern but no problem if it does not match.
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48 (define (match-opt input pattern)
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49 (let ((match (match-pattern input (car pattern))))
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50 (if match match input)))
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51
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52 ; Match anything (other than '()), until pattern is found. The rather
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53 ; clumsy form of requiring an ending pattern is needed to decide where
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54 ; the end of the match is. If none is given, this will match the rest
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55 ; of the sentence.
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56 (define (match-any input pattern)
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57 (cond ((null? (remain input)) #f)
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58 ((null? pattern) (f-cons (remain input) (clear-remain input)))
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59 (else
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60 (let ((accum-any (collector)))
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61 (define (match-pattern-any input pattern)
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62 (cond ((null? (remain input)) #f)
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63 (else (accum-any (car (remain input)))
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64 (cond ((match-pattern (r-cdr input) pattern))
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65 (else (match-pattern-any (r-cdr input) pattern))))))
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66 (let ((retval (match-pattern-any input (car pattern))))
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67 (if retval
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68 (f-cons (accum-any) retval)
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69 #f))))))
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70 </textarea></form>
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71 <script>
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72 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});
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73 </script>
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74
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75 <p><strong>MIME types defined:</strong> <code>text/x-scheme</code>.</p>
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76
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77 </article>
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