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From: Paul Rubin <no.email@nospam.invalid>
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Subject: Re: ada-mode failing at formatting still
Date: Sun, 20 May 2018 17:19:21 -0700
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Date: 2018-05-20T17:19:21-07:00
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"Dan'l Miller" <optikos@verizon.net> writes:
> All the language modes in emacs rely on regular expressions instead of
> a grammar.

Not since many years ago.  Language modes these days tend to use
Semantic.  See:

https://www.gnu.org/software/emacs/manual/html_node/semantic/Introduction.html

which says:

   Semantic provides a new infrastructure to analyze source code using
   parsers instead of regular expressions. It contains two built-in
   parser generators (an LL generator named Bovine and an LALR generator
   named Wisent, both written in Emacs Lisp), and parsers for several
   common programming languages. It can also make use of external
   parsers—programs such as GNU Global and GNU IDUtils.

   Semantic provides a uniform, language-independent API for accessing
   the parser output. This output can be used by other Emacs Lisp
   programs to implement “syntax-aware” behavior. Semantic itself
   includes several such utilities, including user-level Emacs commands
   for navigating, searching, and completing source code.