Erlang Plugin for NetBeans in Scala#8: Pretty Formatting and Pair Matching

Now let’s go on the complex part: Pretty Formatting and Pair Matching. I say they are complex, not because these features are much heavier on language’s semantic complex. Implementing these features mostly deals with lexer tokens. But it’s a bit brain-dried work to across forward/backward in the token stream to get the pair matching and pretty formatting working as you expected.

Because of the complex, I won’t describe the details of how to implement them for Erlang, I just put the links to these source code:

• Pretty Formatting is implemented by ErlangFormatter.scala
• Pair Matching is implemented by ErlangKeystrokeHandler.scala

And registered them in ErlangLanguage.scala as:

 override def getKeystrokeHandler = new ErlangKeystrokeHandler override def hasFormatter = true override def getFormatter = new ErlangFormatter

With these feature implemented, the new plugin can automatically complete/match braces and pair, indent properly when you hit BREAK, input a “end” etc.

BTW, the navigator window was improved during these days, it can now properly show the arity/args of each functions. It’s done by improved AstNodeVisitor.scala and AstDfn.scala

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