https://bugs.freedesktop.org/show_bug.cgi?id=66081
Priority: medium
Bug ID: 66081
Assignee: [email protected]
Summary: Improve grouping of binary operators
Severity: normal
Classification: Unclassified
OS: All
Reporter: [email protected]
Hardware: All
Status: UNCONFIRMED
Version: 4.2.0.0.alpha0+ Master
Component: Formula Editor
Product: LibreOffice
This has been reported on the MathJax mailing list:
https://groups.google.com/forum/#!msg/mathjax-users/_naUsEP0Rxs/OH33AWIc5akJ
If you type e.g.
"a + 2 b"
the grouping in the parsed tree will be
"{a + 2} b"
rather than
"a + {2 b}"
Note that "a + 2 * b" will produce the correct "a + {2 * b}".
Also, binary operations like
a*b*c + d*e*f + g*h*i
are grouped like this
{ { { {{a*b}*c} + {{d*e}*f} } + {{g*h}*i} }
while operators of same priority could just be grouped together like this:
{ {a*b*c} + {d*e*f} + {g*h*i} }
This is not really visible in the editor, but one can see many <mrow> elements
if you export to MathML.
I think the solution to the first problem will be to interpret "2 b" as a
Product (using the terminology of the grammar in
http://cgit.freedesktop.org/libreoffice/core/tree/starmath/source/parse.cxx#n1170),
so that it becomes of priority higher than Sum. If we fix bug 55853 without
breaking https://issues.apache.org/ooo/show_bug.cgi?id=11752, then "2b"
(without space) should become of priority higher than SubSup. I guess this can
be done by grouping token variable and number tokens in one Term here:
http://cgit.freedesktop.org/libreoffice/core/tree/starmath/source/parse.cxx#n1420.
The second problem is less serious (the operator priorities are respected), so
that could just be fixed in mathmlexport.cxx where binary operators of same
priority will be grouped in one <mrow>. We can use the priority from the MathML
operator dictionary
(http://www.w3.org/TR/MathML3/appendixc.html#oper-dict.entries-table) but the
simplest will be to use the nGroup property of the token associated to the
binary op node.
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