[Fribidi-discuss] resolution of neutral characters

[Dov Grobgeld]

Hi Tomas,

This is indeed according to the BiDi algorithm. The closing paranthesis
after the k is resolved according to the base direction, that is determined
by the A. You can always resolve this by either putting a LRM after
the closing parenthesis or by enclosing the whole log(k) in a LRE
PDF pair. The question though is what is the best user interface
solution to this problem in a word processor... A user may be
taught that he always has to put a LRM after an equation, but if
she did not and see the mess of "B (log(k A" it becomes quite non-
intuitive that the solution is to place the cursor after the first ( 
and enter a LRM... Another solution is to enter equation mode that 
should always be in a LRE/PDF pair. I really don't have any easy 
solution. How do other systems solve it?

Dov

On Thu, Apr 10, 2003 at 06:17:24PM +0100, Tomas Frydrych wrote:
> Hi everyone,
> 
> I think I might have found a bug in FriBidi's handling of neutral 
> characters. I am not sure whether this is a bug in FriBidi, or 
> whether this is a problem with the Unicode algorithm, but one way or 
> another the resulting behaviour is unintuitive.
> 
> The following string, where capitals represent RTL characters,
> 
>     "A log(k) B"
> 
> resolves to
> 
>     "B (log(k A"
> 
> I think that the correct visual string should be
> 
>     "B log(k) A"
> 
> Obviously, the closing parenthesis is presently resolved to an RTL 
> character (embeding level 1), while the opening parenthesis is 
> treated as LTR character (level 2). It seems to me that matching 
> pairs of parentheses, braces, etc., should always be resolved to the 
> embeding level of the opening element of the pair.
> 
> Tomas
> 
> 
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