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Re: Bidirectional text and URLs

From: Richard Stallman
Subject: Re: Bidirectional text and URLs
Date: Sat, 29 Nov 2014 12:04:17 -0500

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

  > The RTL flag character in the example isn't part of the URL, it only
  > precedes it.

(I couldn't see it in any case.)

This suggests we need to provide a primitive to tell Lisp programs a
guaranteed answer for which direction the text at a certain point is
displayed in.  Also, a primitive to verify that a certain region of
text has no bidi strangeness within it.  It could return the position
of the first bidi strangeness in the region, or nil.

On issues like this, better safe than sorry.  The user who wants to
override the safety measure can easily do that.  For instance,
inserting line breaks around the URL would make it be considered safe,

I think the precaution I suggested about bidi flags inside the URL is
needed also.

Dr Richard Stallman
President, Free Software Foundation
51 Franklin St
Boston MA 02110
www.fsf.org  www.gnu.org
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