You might like to take a look at Simon Cozen's
PDF of his
Perl 5 Internals course notes as mentioned
here.
I enjoyed reading it very much. It is easy to get through,
not too long, and covers topics like what yacc is,
what basic functions are in what files, how the parse
tree is set up, how regular expressions are computed,
and lots of one-liner
experiments you can do to see the structures created
internally for variables and data structures.
You may also be interested in reading thoughts on
Larry Wall quotes which cover some of the philosophical
points mentioned in more detail in Larry Wall's Onion
documents among others.
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