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Re: Debugging SMIE for sh-script.el

From: Stefan Monnier
Subject: Re: Debugging SMIE for sh-script.el
Date: Mon, 06 Sep 2021 16:23:04 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

> returned by the smie lexer as "" when it runs into them from the outside.

There's no such thing as "the smie lexer":
Every major mode uses the lexer it wants with the behavior it fancies.

If the lexer decides to return nil when bumping into a char with paren
or string syntax then SMIE will treat it as a sign that this should be
handled in the "normal" way.  The main benefit is that paired parens can
then be skipped with things like `forward-sexp` which is much faster
than letting SMIE do the lexing+parsing inside the pair.

But a lexer doesn't have to do that.  An example would be when the
parens are escaped, e.g, in ELisp, `foo\(toto\)bar` is a single symbol
so an SMIE lexer for ELisp should handle it as a single token.


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