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I actually have to disagree with the previous post. I've been working on a derivative version of mini basic (and adding my own derivation to it) and was happy to find the chapter "How to write a BASIC interpreter" starting on page 44. While not a complete guide to writing an interpreter it does a credibly job of laying out some fundamentals of how the statement parsing works (rather, why it works as it does) and more importantly to me, how the expression parsing works. Well worth the two fifty for the download, I'd pay 10 times that for the 750 page detailed version.

This book is more about MiniBasic than it is about how to write an interpreter. There is some description of MiniBasic, and then about a chapter's worth of how the expression parser works, and then the book is all just C code to the end. To the author: Please write a second edition with much more information in the middle part of the book.