Reversed arabic inside c r l columns with xcolor package table option

[seloumi]

Adding xcolor with option table (same with colortbl) Arabic words inside columns c r or l are reversed

complement

The issue apparently appears only with Amiri font may be this is related with this #25

\documentclass[12pt]{book}
\usepackage[table]{xcolor}% or \usepackage{colortbl} 
\usepackage[bidi=basic,layout=lists.tabular]{babel}
\babelprovide[import=ar,mapdigits,main]{arabic}
\babelfont{rm}{Amiri} % no issue with others fonts 
  
\begin{document}
\Huge
\begin{tabular}{c} 
اللغة العربية  \\  
\end{tabular}
\end{document} 

https://tex.stackexchange.com/q/509234/54817

[u-fischer]

colortbl inserts the cell content via \unhbox, and it looks as if babel (?) injects a \begindir TLT if unhbox is used:

\documentclass[12pt]{book}
\usepackage[bidi=basic,layout=lists]{babel} \babelprovide[import=ar,mapdigits,main]{arabic}
\babelfont{rm}{Amiri}

\begin{document}
\showoutput
اللغة 

\setbox0\hbox{اللغة}

\copy 0 

\unhbox 0 

\end{document} 

gives

Completed box being shipped out [1]
\vbox(630.3738+0.0)x407.0, direction TRT
.\glue 20.0
.\vbox(610.3738+0.0)x390.0, shifted 17.0, direction TRT
..\vbox(12.0+0.0)x390.0, glue set 5.20898fil, direction TRT
...\glue 0.0 plus 1.0fil
...\hbox(6.79102+1.13672)x390.0, glue set 382.96875fil, direction TRT
....\glue 0.0 plus 1.0fil
....\TU/Amiri(1)/m/n/12 ١
..\glue 19.8738
..\glue(\lineskip) 0.0
..\vbox(548.5+0.0)x390.0, glue set 507.5fil, direction TRT
...\write-{}
...\write1{\babel@aux{arabic}{}}
...\glue(\topskip) 3.36914
...\hbox(8.63086+0.29883)x390.0, glue set 355.875fil, direction TRT
....\localpar
.....\localinterlinepenalty=0
.....\localbrokenpenalty=0
.....\localleftbox=null
.....\localrightbox=null
....\hbox(0.0+0.0)x18.0, direction TRT
....\TU/Amiri(1)/m/n/12 ا
....\TU/Amiri(1)/m/n/12 󰹘
....\TU/Amiri(1)/m/n/12 󰹞
....\TU/Amiri(1)/m/n/12 󰅮
....\TU/Amiri(1)/m/n/12 󰉁
....\penalty 10000
....\glue(\parfillskip) 0.0 plus 1.0fil
....\glue(\rightskip) 0.0
...\glue(\baselineskip) 5.57031
...\hbox(8.63086+0.29883)x16.125, direction TRT
....\TU/Amiri(1)/m/n/12 ا
....\TU/Amiri(1)/m/n/12 󰹘
....\TU/Amiri(1)/m/n/12 󰹞
....\TU/Amiri(1)/m/n/12 󰅮
....\TU/Amiri(1)/m/n/12 󰉁
...\glue(\parskip) 0.0 plus 1.0
...\glue(\baselineskip) 5.57031
...\hbox(8.63086+0.29883)x390.0, glue set 355.875fil, direction TRT
....\localpar
.....\localinterlinepenalty=0
.....\localbrokenpenalty=0
.....\localleftbox=null
.....\localrightbox=null
....\hbox(0.0+0.0)x18.0, direction TRT
....\TU/Amiri(1)/m/n/12 ا
....\begindir TLT                           <----------------
....\TU/Amiri(1)/m/n/12 󰹘
....\TU/Amiri(1)/m/n/12 󰹞
....\TU/Amiri(1)/m/n/12 󰅮
....\TU/Amiri(1)/m/n/12 󰉁
....\enddir TLT
....\penalty 10000
....\glue(\parfillskip) 0.0 plus 1.0fil
....\glue(\rightskip) 0.0
...\glue -0.29883
...\glue 0.0 plus 1.0fil
...\glue 0.0
..\glue(\baselineskip) 30.0
..\hbox(0.0+0.0)x390.0, direction TRT

[seloumi]

With another font there isn't \begindir TLT ! and the output is fine.

Completed box being shipped out [1]
\vbox(630.3738+0.0)x407.0, direction TRT
.\glue 20.0
.\vbox(610.3738+0.0)x390.0, shifted 17.0, direction TRT
..\vbox(12.0+0.0)x390.0, glue set 3.4043fil, direction TRT
...\glue 0.0 plus 1.0fil
...\hbox(8.5957+0.0)x390.0, glue set 383.68945fil, direction TRT
....\glue 0.0 plus 1.0fil
....\TU/Arial(1)/m/n/12 ظ،
..\glue 19.8738
..\glue(\lineskip) 0.0
..\vbox(548.5+0.0)x390.0, glue set 507.5fil, direction TRT
...\write-{}
...\write1{\babel@aux{arabic}{}}
...\glue(\topskip) 2.70117
...\hbox(9.29883+0.0)x390.0, glue set 355.31836fil, direction TRT
....\localpar
.....\localinterlinepenalty=0
.....\localbrokenpenalty=0
.....\localleftbox=null
.....\localrightbox=null
....\hbox(0.0+0.0)x18.0, direction TRT
....\TU/Arial(1)/m/n/12 ط§
....\TU/Arial(1)/m/n/12 ï»ں
....\TU/Arial(1)/m/n/12 ï» 
....\TU/Arial(1)/m/n/12 ï»گ
....\TU/Arial(1)/m/n/12 ï؛”
....\penalty 10000
....\glue(\parfillskip) 0.0 plus 1.0fil
....\glue(\rightskip) 0.0
...\glue(\baselineskip) 5.20117
...\hbox(9.29883+0.0)x16.68164, direction TRT
....\TU/Arial(1)/m/n/12 ط§
....\TU/Arial(1)/m/n/12 ï»ں
....\TU/Arial(1)/m/n/12 ï» 
....\TU/Arial(1)/m/n/12 ï»گ
....\TU/Arial(1)/m/n/12 ï؛”
...\glue(\parskip) 0.0 plus 1.0
...\glue(\baselineskip) 5.20117
...\hbox(9.29883+0.0)x390.0, glue set 355.31836fil, direction TRT

[jbezos]

With \babelcharproperty{980000}[990000]{direction}{al} it seems to work, so, yes, very likely it's related to #25. I wonder if there is a way to know the bidi class of glyphs in the PUA (to be more precise, if the font contains this info).

[car222222]

"I wonder if there is a way to know the bidi class of glyphs in the PUA" Does this make sense? I thought thta "bidi class" is a Unicode property, so it is a property of a Unicode Character Slot, not of a Font Glyph Slot. Or am I wrong?

[jbezos]

@car222222 Sure it's a character property. See what I actually meant here: #25 (comment) . Anyway, as Khaled pointed out in the same thread, the PUA is not used by the font, but by luaotfload, so my question didn't make sense anyway (but for other reasons).