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This removes the problem of possibly expensive copies occurring due to
working with tokens produced from the lexer (that C++ just... does):
now we hold pointers where the copy operator is a lot easier to use.
I want expensive stuff to be done by me and for a reason: I want to
be holding the shotgun.
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This makes enum elements scoped which is actually quite useful as I
prefer the namespacing that enum's give in C++.
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Note that this is basically the same as the previous version,
excluding the fact that it uses C++ idioms more and does a bit better
in error checking.
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One thing I've realised is that even methods such as this require
error tracking. I won't implement it in the tokenise method as it's
not related to consuming the string per se but instead in the main method.
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I made the escape sequence parsing occur here instead of leaving it to
the main tokenise_buffer function as I think it's better suited here.
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Note the overall size of this function in comparison to the C version,
as well as its clarity.
Of course, it is doing allocations in the background through
std::string which requires more profiling if I want to make this super
efficient™ but honestly the assembler just needs to work, whereas the
runtime needs to be fast.
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The implementation for tokenise_symbol is already a lot nicer to look
at and add to due to string/string_view operator overloading of ==.
Furthermore, error handling through pair<> instead of making some
custom structure which essentially does the same thing is already
making me happy for this rewrite.
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