> You asked if I learned the syntax from the BNF, not if I learned the semantics from it.
Actually, I didn't ask you anything--it was a rhetorical question, within the context of a post you ignored.
> On any project with more than one person (and arguably even many projects with a single person, for the you of today is not the same you of yesteryear), communication is absolutely essential. And if what you're describing is a language, than the BNF for the syntax and corresponding prose for semantics is the most effective way we know of to document and communicate that language. If instead you try to wing it and rely on examples to communicate the specification, then the resulting mess will take you several times as long to clean up as actually properly designing out the documentation would have taken in the first place--and this I speak from bitter experience.
BNFs might the best way to communicate the syntax of a language to another person who needs to know the syntax to that level of specificity, but the fact that mainstream compilers often don't have widely available BNFs shows that a BNF simply isn't a vital part of compilation. Generating into a real target assembly is a vital part of compilation: if it doesn't generate to a useful target, it literally isn't a compiler.
I'm not against learning BNFs. They're useful. My point, from the beginning, has been that while assembly generation is vastly more complicated and important than parsing, the vast majority of language materials focus on parsing, giving only cursory coverage to generation.
There's literally detailed tutorials on how to use specific tools to do specific steps of parsing. Meanwhile, generation is covered, if at all, by generating partial pseudo-assembly for fictional architectures. Even if you manage to translate the pseudo-assembly into x86, good luck finding any guidance on how to link in a garbage collector, or properly tag the generated code with metadata for debugging or exception reporting, or how C calling conventions work so you can even implement exceptions on the stack... I don't want to hear about your experience with communicating about easy stuff like parsers until you've worked on a difficult problem.
> P.S. I didn't engage with the rest of your post because I wasn't interested in writing an essay to rebut your points.
If you don't feel like participating in the conversation, fine, just go away. Don't take cheap shots at out-of-context sentences where it's convenient, and pretend that you're not responding to the rest because it's beneath you.