Tiger compiler, lexical analysis: looking for reviews and comments

Hello all,


As a hobby and fun project, and partly also to improve my C
programming skills, I have started working my way through Appel's
'Modern Compiler Implementation in C'.


I have just finished chapter 2 on lexical analysis and I think I have
a lexer which is quite ok. However, before I move on to chapter 2, i
want to make sure my lexer is *more than* OK. So if you're
interested, then I would like to ask you:


1) Please review my tiger.lex file from both the style point of view
(indentation, comments, clean coding?) and from the correctness point
of view.


2) Please stress-test my lexer and find bugs. If you find a bug, then
please provide me a .tig file that illustrates what goes wrong and I
will try to fix it myself.


3) If you have a GitHub account, feel free to follow me and send me
pull requests with improvements. If you don't have a GitHub account,
create one, because social coding rockzzz! ;-)


Any other suggestions or comments are also always welcome! My code
can be found on GitHub in the chap02 directory at
https://github.com/BartVandewoestyne/c/tree/master/books/Modern_Compiler_Implementation_in_C/


Regards,
Bart

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