AST Transformations
[ 222 ]We mentioned earlier that the Groovy compiler supports custom file extensions. If
we add a META-INF/services/org.codehaus.groovy.source.Extensions file to
our JAR with a list of file extensions we want to support, then the compiler will also
compile any files it finds with these extensions.
Summary
This chapter has been quite a deep dive into the relatively complex subject of AST
transformations. We've covered both local and global AST transformations and even
used AST transformation to build a mini DSL.
In the next chapter, we will look at some of the publicly available Groovy DSLs. We
will describe how to use them, but we will also be taking a critical view of how they
might be implemented given the knowledge we now have about the Groovy MOP
and Groovy AST transformations.
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