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How to write a source code editor for a custom language in Rich Client Plateform?

I am creating a tool for a custom language. It will contain many components, including a source code editor. What do I need to create this editor. For starters, I would like to highlight syntax, outline, and formation.

I have already developed a parser using ANTLR.

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If you really need / need to create your DSL and the editor for this "manually", I suggest using the JFace Text framework to create an editor.

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Take a look at the JEditorPane and its associated document. This can be used for highlighting. Also see http://download.oracle.com/javase/tutorial/uiswing/components/editorpane.html for more information on how to set up a document, specifically StyledDocument.

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