This is a book about code generation.
From the two chapters that are publically available it seems that he knows what he is talking about.
My current take on codegen is to simply use xslt.
I have an extended xslt utility that I use.
The syntax is:
xslt source transform target [name value]*
This allows one root document to be used to create a batch file that generates the used code from the one core document.
It has a few other tricks (handling or header comments and logging changes), but that is about it.
It does include some string manipulation extensions.
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