The general approach is to replace rules of the form. What this means is that when expanding an E and looking at an id, we wouldn't know if that id is starting an assignment or is just a variable, unless we examine not just the id, but also the following token.
So the parser needs to look at the next two symbols. Understand that "choice points" can appear at various places within a grammar. Sometimes no number of lookahead tokens is sufficient for the parser. Then you'd need to use syntactic lookahead. For sophisticated, or bizarre, parsing, sometimes semantic lookahead is needed. If the syntax checker above looked like it had a lot of extra markup in its parsing functions, that's because parsers are supposed to do stuff while parsing.
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Press Ctrl-[ to toggle between matching braces. The " Editor Code Folding " module provides the functionality you need to implement for creating your own code folds.
Add a dependency on the " Editor Code Folding " module. Create a new FoldManager :. Create a new FoldManagerFactory :. When you install the module into the application, open an SJ file, and type a multiline comment at the top of the file, as shown at the start of this section, a code fold will automatically appear around the comment.
For more information about creating and developing NetBeans modules, see the following resources:. Apache NetBeans. Latest release. Prior to starting to work on this tutorial, you must have completed the JavaCC Lexer Generator Integration Tutorial , since that tutorial shows how to create the module structure, file type support, and lexer used in the instructions that follow.
In your project structure, you should now see your new package and new file:. In your module, create a new package named org. Reader; import java. StringReader; import java. Level; import java. Logger; import javax. SourceModificationEvent]; import org. Register the parser in the language class created in the previous tutorial, as follows:.
Language; import org. DefaultLanguageConfig; import org. LanguageRegistration; import org. Parser; import org. SJTokenId; import org. These additions and changes should be done in your JavaParser class. Add the following method to your JavaParser body:. Register the factory in the layer file. ArrayList; import java. When you install the module into the application, open an SJ file, and choose Source Format Alt-Shift-F , you will see a message in the status bar, showing you that the extension point is working correctly.
When the user selects an opening brace, the closing brace should be highlighted, and vice versa. Moreover, when Ctrl-[ is pressed on the keyboard, the cursor should move back and forth between matching braces.
This feature is especially useful if your language is likely to be used to create deeply nested code structures. In the first screenshot, the opening brace is selected, which results in it being highlighted, together with the closing brace, so that you can see where a code phrase or code block begins and ends and you can toggle between them by pressing Ctrl-[:.
Similarly, here another code block is made visible by selecting either the opening or closing brace, causing the matching brace to also be highlighted, and enabling the cursor to be toggled between the matching braces via Ctrl-[:. Add a dependency on the " Editor Brace Matching " module. Create a new BracesMatcherFactory :. One of these is used in the code above. When you install the module into the application, open an SJ file, and select a brace, you should see that the brace is highlighted, together with its matching brace.
Press Ctrl-[ to toggle between matching braces. The " Editor Code Folding " module provides the functionality you need to implement for creating your own code folds. In this tutorial, we will use the custom code folding provided by the NetBeans Editor Library.
No dependencies on any additional modules are needed. When you install the module into the application, open an SJ file, and type a custom code fold text above and below a piece of code in the way shown in the images above and a code fold will automatically appear around the code between the code fold text. For more information about creating and developing NetBeans modules, see the following resources:. Apache NetBeans. Latest release. Prior to starting to work on this tutorial, you must have completed the JavaCC Lexer Generator Integration Tutorial , since that tutorial shows how to create the module structure and file type used in the instructions that follow.
As before, the Token class does not yet compile because the class it references, JavaParserConstants , does not yet exist. It will be generated at the end of this section of the tutorial by JavaCC and at that stage the Token class will compile.
The Java1. In your module, create a new package named org. Reader; import java. StringReader; import java.
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