Java comes with many pre-built classes for this purpose. Fortunately it is very easy to turn just about anything into a Stream or a Reader. The syntax lexers accept your document through Streams and Readers. Syntax Highlighting works like this: you give the text to the lexer, it goes through it and gives it back to you piece by piece and tells you what color to make each piece. The demo supports cut, copy, paste, and syntax highlighting, but little else. If you would like you may browse the source code for the demo. If you haven't done so already, download the syntax highlighting package and the ProgrammerEditorDemo.java that comes with it. Before going any further, it would be a good idea to familiarize yourself the JTextPane Tutorial in Sun's Java Tutorial. The Programmer's Editor Demo included with this tutorial uses JTextPane but the techniques discussed here will work with other base editor classes as well. Luckily, the libraries that come with Java include a JTextPane (API). This tutorial assumes that you have a text area to work with and that you can change the color of the text in that text area.
#What is a text editor in programming how to#
While this this tutorial does not tell you everything you need to know to write your own text editor, you will learn how to add syntax highlighting and and gain a sense of the overall complexity of undertaking such a project. The Internet is littered with hundreds of unfinished or poorly working text editors. Creating text editors takes programming experience and a firm basis in theory. Despite initial appearances, writing a text editor is not a trivial task.
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