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Re: Emacs contributions, C and Lisp

From: Richard Stallman
Subject: Re: Emacs contributions, C and Lisp
Date: Wed, 07 Jan 2015 14:25:01 -0500

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  > In a modern IDE, you can complete anything -- struct members or
  > object member variables/functions, type names, etc., etc., and you
  > need what are essentially compiler data structures to get that stuff,
  > and you need the AST to understand the context in which you're
  > requesting the completion.

I am not convinced this requires the entire AST.
I think it could be done with a lot less.

It certainly can be done with less.  For instance, if the code says

  foo.x + bar.y


  foo.x - bar.y

it makes no difference for completion what that operator is.  Clearly
there is information from the AST that need not be included in order
to fully support completion.

I think you propose "entire AST" because it is conceptually satisfying
to you, not because all the data in the AST are necessary.

What data ARE necessary?

Dr Richard Stallman
President, Free Software Foundation
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Boston MA 02110
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