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It required some weird changes, I'm not sure I'm happy with them all
yet, but I"m getting closer. It parses all basics, now we need to build
an AST so it's actually useful :-P
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- Creating a LookaheadIterator as a general class that could be used.
- Wrap symbols in a symbol struct that tracks symbol start and end
position for error reporting.
- Make a struct for position in a file as well.
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ALso the parser is next up. But I want to get some frontend
done so it won't whine at me so much.
The lexer has a lot more to go, I'm sure, but right now it
does all the basics that I need it to do.
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Tokens now can only have a-z, A-Z, or 0-9 in them, we can add more
later, _ and - maybe? but this lets us easily break on = and other
things we may want.
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