Hi,

Sean has left the following comment at Create a flex+bison tutorial http://www.google-melange.com/gci/task/view/google/gci2012/7985245:


almost there


Daniel, that's starting to look great. It could be condensed a little more but I think it easily fits the bill. The only piece I don't see in the tutorial is an explanation for the lexer tokens. If I'm writing my own lexer+parser, what tokens can be used? How/Why were those names chosen? There should be some brief explanation since that's the first bit of "code" you present. You may even want to lead into explaining what the goal is (eg, "We going to create a simpel calculator where you can type '1+1' and it tells you 2.") since I don't see that in the intro.

Other questions I didn't see answered, but you maybe covered are why write the lexer first? Does it matter? Is it possible to write a parser without a lexer or a lexer without a parser? What changes?

That's looking fantastic. We'll be creating a follow-on task to convert your tutorial into our new Perplex+Lemon syntax next. ;)


Greetings,
The Google Open Source Programs Team


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