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The preprocess_* functions are now privately contained within the
implementation file to help the preprocesser outer function.
Furthermore I've simplified the API of the preprocess_* functions by
making them only return pp_err_t and store their results in a vector
parameter taken by reference.
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We leave the parameter tokens alone, considering it constant, while
the parameter vec_out is used to hold the new stream of tokens. This
allows the caller to have a before and after view on the token stream
and reduces the worry of double frees.
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They copy and construct new token vectors and just read the token
inputs.
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This C++ rewrite allows me to rewrite the actual API of the system.
In particular, I'm no longer restricting myself to just using enums
then figuring out a way to get proper error logging later down the
line (through tracking tokens in the buffer internally, for example).
Instead I can now design error structures which hold references to the
token they occurred on as well as possible lexical errors (if they're
a FILE_LEXICAL_ERROR which occurs due to the ~%USE~ macro). This
means it's a lot easier to write error logging now at the top level.
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I've decided to split the module parsing into two modules, one for the
preprocessing stage which only deals with tokens and the parsing stage
which generates bytecode.
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