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POSyntax Highlighting in Cocoa TextView? Experiences? Suggestions? Ideas?
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/1517239/syntax-coloring-for-cocoa-app">Syntax coloring for Cocoa app</a> </p> </blockquote> <p>I'm interested in <strong>syntax highlighting</strong> in a <strong>Cocoa</strong> TextView.</p> <p>I found several resources:</p> <ul> <li><p><a href="https://stackoverflow.com/questions/1517239/syntax-coloring-for-cocoa-app">approach with flex</a>, via a <a href="http://westes.github.io/flex/manual/Patterns.html" rel="nofollow noreferrer">flex</a> pattern matched against <code>textStorageDidProcessEditing</code> in a <code>TextView</code> delegate. In this approach the whole string get parsed on each input event, hence performance degrades.</p></li> <li><p>CocoaDev has an <a href="http://www.cocoadev.com/index.pl?ImplementSyntaxHighlighting" rel="nofollow noreferrer">own page on the topic of syntax highlighting</a>:</p> <ol> <li><p>Use <code>NSTextStorageDidProcessEditingNotification</code>, then get the edited range, and just apply the coloring there. The range might be wordboundaries or anything; this definitely improves performance.</p></li> <li><p>Mentioned there: <em>Xcode, for example, only colorizes text that's currently on-screen, and defers colorizing the rest of the document until you scroll through it.</em> How would one implement this?</p></li> <li><p>Use <code>NSLayoutManager</code> – via <em>Temporary attributes [which] are used only for on-screen drawing and are not persistent in any way...</em> as the docs say, but that <em>doesn't color the last edited range, until a whitespace character is entered.</em></p></li> <li><p>Custom Helper like <a href="http://www.zathras.de/angelweb/sourcecode.htm#UKSyntaxColoredTextDocument" rel="nofollow noreferrer">UKSyntaxColoredDocument</a> – nice, but language definition is done via property list; how to use additional/existing language definitions? </p></li> </ol></li> </ul> <p>None of the approaches seem really extensible or robust to me (except the 4. maybe ..).</p> <p>I am aware of robust existing libraries for SH like <a href="http://pygments.org/" rel="nofollow noreferrer">pygments</a>; and of <a href="http://pyobjc.sourceforge.net/" rel="nofollow noreferrer">PyObjC</a>.</p> <p><strong>Question</strong>: How would it be possible to use some existing library e.g. like <a href="http://pygments.org/" rel="nofollow noreferrer">pygments</a> to have an extensible and performant syntax highlighting in a Cocoa <code>TextView</code>?</p> <p><em>Note</em>: I know this question is very broad (and much too long). Experiences and suggestions as well as solutions are welcome. Thanks. </p> <hr> <p>Found another similar thread on that matter: <a href="https://stackoverflow.com/questions/1517239/syntax-coloring-for-cocoa-app">Syntax coloring for Cocoa app</a></p>
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