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<title>CodeMirror: JavaScript mode</title>
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<ul>
<li><a href="../index.html">Language modes</a>
<li><a class=active href="#">JavaScript</a>
</ul>
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<article>
<h2>JavaScript mode</h2>
<div><textarea id="code" name="code">
// Demo code (the actual new parser character stream implementation)
function StringStream(string) {
this.pos = 0;
this.string = string;
}
StringStream.prototype = {
done: function() {return this.pos >= this.string.length;},
peek: function() {return this.string.charAt(this.pos);},
next: function() {
if (this.pos < this.string.length)
return this.string.charAt(this.pos++);
},
eat: function(match) {
var ch = this.string.charAt(this.pos);
if (typeof match == "string") var ok = ch == match;
else var ok = ch && match.test ? match.test(ch) : match(ch);
if (ok) {this.pos++; return ch;}
},
eatWhile: function(match) {
var start = this.pos;
while (this.eat(match));
if (this.pos > start) return this.string.slice(start, this.pos);
},
backUp: function(n) {this.pos -= n;},
column: function() {return this.pos;},
eatSpace: function() {
var start = this.pos;
while (/\s/.test(this.string.charAt(this.pos))) this.pos++;
return this.pos - start;
},
match: function(pattern, consume, caseInsensitive) {
if (typeof pattern == "string") {
function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
if (consume !== false) this.pos += str.length;
return true;
}
}
else {
var match = this.string.slice(this.pos).match(pattern);
if (match && consume !== false) this.pos += match[0].length;
return match;
}
}
};
</textarea></div>
<script>
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
lineNumbers: true,
matchBrackets: true,
continueComments: "Enter",
extraKeys: {"Ctrl-Q": "toggleComment"}
});
</script>
<p>
JavaScript mode supports several configuration options:
<ul>
<li><code>json</code> which will set the mode to expect JSON
data rather than a JavaScript program.</li>
<li><code>jsonld</code> which will set the mode to expect
<a href="http://json-ld.org">JSON-LD</a> linked data rather
than a JavaScript program (<a href="json-ld.html">demo</a>).</li>
<li><code>typescript</code> which will activate additional
syntax highlighting and some other things for TypeScript code
(<a href="typescript.html">demo</a>).</li>
<li><code>statementIndent</code> which (given a number) will
determine the amount of indentation to use for statements
continued on a new line.</li>
</ul>
</p>
<p><strong>MIME types defined:</strong> <code>text/javascript</code>, <code>application/json</code>, <code>application/ld+json</code>, <code>text/typescript</code>, <code>application/typescript</code>.</p>
</article>