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Based on the rest of GP's comment, I think he meant to say "parser" rather than "text editor". And that's referring to lemon: https://en.wikipedia.org/wiki/Lemon_(parser_generator)

Unfortunately, it just says

> And the text editor that I used to write SQLite is one that I wrote myself. [10]

But with no more details.

If you read reference [10] on the book, he says he did not release the source of the editor.

Hm yeah I didn’t, I left the book for when I’m on a computer - thanks for spotting it!

Obviously, now I’m curiouser about the secret editor :)

Oh i wrote the book ^^, that's why.