Upgrade lexer #2
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The original lexer was written extremely lazily, trying to treat every lexical token the same. Among other issues, it prevented "special characters" like whitespace in strings.
This rewrites the lexer to use a similar pattern as the parser: giving control to helper functions to lex different kinds of tokens, returning a pointer to the next not lex-ed character on success.
The two major features this adds support for is:
This also improves the accuracy of token location tracking.
Blog post to follow.