Ken,
Aha! Embarrassed to admit I completely missed that as I was considering
reordering in a later stage. Looks like an easy fix, thanks so much for the
help,
Loren
On Oct 18, 2013, at 2:37 PM, Whistler, Ken ken.whist...@sap.com wrote:
Loren,
Your implementation is fine through [Resolving_Implicit_Levels]. And rule I1
*does* set
the embedding level of the 0009 from 0 to 1.
What you are missing it that rule L1 then *re*sets the level of 0009 back to
the
paragraph embedding level, i.e. 0. And that is how you get the expected
result.
Here is the relevant portion of the corresponding trace output from the
bidiref
implementation.
HTH,
--Ken
Trace: Entering br_UBA_ResolveNeutralsByLevel [N2]
Current State: 16
Text:0661 0009 0028 0662 0029
Bidi_Class:ANRR ANR
Levels: 00000
Runs:LL
Trace: Entering br_UBA_ResolveImplicitLevels [I1, I2]
Current State: 17
Text:0661 0009 0028 0662 0029
Bidi_Class:ANRR ANR
Levels: 21121
Runs:LL
Trace: Entering br_UBA63_ResetWhitespaceLevels [L1]
Current State: 18
Text:0661 0009 0028 0662 0029
Bidi_Class:ANRR ANR
Levels: 20121
Runs:LL
From: unicode-bou...@unicode.org [mailto:unicode-bou...@unicode.org] On
Behalf Of Loren Brichter
Sent: Friday, October 18, 2013 9:09 AM
To: unicode@unicode.org
Subject: 6.3.0 Bidi implementation snag
I'm finishing up an implementation of the 6.3.0 Bidi algorithm and hit a
snag: currently passing all tests but one.
After much careful re-re-reading of the spec, I can't quite figure out where
this thing is going wrong and would really appreciate some advice, or perhaps
someone who knows that this test case is in fact incorrect (unlikely as that
may be).
The particular test case is this:
0661 0009 0028 0662 0029;2;0;2 0 1 2 1;0 1 4 3 2
(line 184 of BidiCharacterTest.txt)
The correct levels are [2 0 1 2 1], however, this implementation resolved
the levels to be [2 1 1 2 1]. A single incorrect level for the Segment
Separator at index 1.
Below is a trace of the algorithm (apologies if this is not visible on your
end in a monospaced font, it is much more readable that way). In stage [N1]
the S at index 1 becomes R. This seems correct to me because the previous
character at index 0 is AN (interpreted as R according to the spec) and the
following character at index 2 is an R. Both preceding and following
characters are the same direction, so the S becomes an R as well.
At stage [Resolving_Implicit_Levels], the R (previously S) at index 1 has an
even level (0), so its level is increased by one (0-1). I'm not entirely
sure why the test has the level staying at 0, unless I missed something else
completely unrelated to these two stages mentioned.
Any advice would be greatly appreciated, thanks very much!
Loren
[Resolving_Neutral_and_Isolate_Formatting_Types]
matching:--4--
bidiclass: ANRR ANR
embedding:00000
[Resolving_Implicit_Levels]
matching:--4--
bidiclass: ANRR ANR
embedding:21121
