Bug 153984 – The Operator Dictionary lacks entries for U+1EEF0 and U+1EEF1

• Status: RESOLVED
• Resolution: FIXED
• Component: MathML

[Frédéric Wang (:fredw)]

These are mentioned on http://www.unicode.org/charts/PDF/U1EE00.pdf referred by the MathML 3 recommendation, but absent from their suggested operator dictionary. I don't think any math font supports them yet.

Stretching operators
The following operators stretch based on the width of the text that is displayed below or above them.
1EEF0 ARABIC MATHEMATICAL OPERATOR MEEM WITH HAH WITH TATWEEL
  • used in Arabic mathematics to denote summation
  • stretched at the tatweel
  → 2211 ∑  n-ary summation
1EEF1 ARABIC MATHEMATICAL OPERATOR HAH WITH DAL
  • used in Persian mathematics to denote limits
  • stretched between the hah and the dal

[Frédéric Wang (:fredw)]

Created attachment 286710 [details]
WIP Patch

[Frédéric Wang (:fredw)]

*** Bug 122296 has been marked as a duplicate of this bug. ***

[Frédéric Wang (:fredw)]

Created attachment 286853 [details]
Patch WIP

Adding a test and fixing a coding error with explicit prefix. I'll add a test for horizontal stretchiness tomorrow.

[Frédéric Wang (:fredw)]

Created attachment 286963 [details]
Patch

[Darin Adler]

Comment on attachment 286963 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=286963&action=review

> Source/WebCore/mathml/MathMLOperatorDictionary.cpp:1109
> +// The following two non-BMP characters are handled separately so that the arrays 'dictionary' and
> +// 'horizontalOperators' can use UChar instead of UChar32 and avoid an increase of memory footprint.

I don’t think this is the right call. The additional memory footprint is about 2kB. We should keep the code simple instead.

[Frédéric Wang (:fredw)]

(In reply to comment #5)
> I don’t think this is the right call. The additional memory footprint is
> about 2kB. We should keep the code simple instead.

OK, I'll rewrite a simpler patch then.

[Frédéric Wang (:fredw)]

Created attachment 287248 [details]
Patch

[Frédéric Wang (:fredw)]

Committed r205111: <http://trac.webkit.org/changeset/205111>