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* LMTX error processing Adobe Arabic Naskh font
@ 2021-11-10 16:00 Idris Samawi Hamid ادريس سماوي حامد via ntg-context
  2021-11-10 16:04 ` Idris Samawi Hamid ادريس سماوي حامد via ntg-context
  2021-11-13 23:13 ` Idris Samawi Hamid ادريس سماوي حامد via ntg-context
  0 siblings, 2 replies; 3+ messages in thread
From: Idris Samawi Hamid ادريس سماوي حامد via ntg-context @ 2021-11-10 16:00 UTC (permalink / raw)
  To: mailing list for ConTeXt users
  Cc: Idris Samawi Hamid ادريس
	سماوي حامد

Dear Hans and gang,

Consider the following MWE:

==============
\definefont[ARABICFONT][file:Adobe_Naskh.ttf*arabic at 28pt]
% \definefont[ARABICFONT][file:Amiri-Regular_0.ttf*arabic at 28pt]
% \definefont[ARABICFONT][file:Scheherazade-Regular.ttf*arabic at 28pt]
% \definefont[ARABICFONT][file:UthmanTN1_Ver10.otf*arabic at 28pt]
% \definefont[ARABICFONT][file:almfixed.otf*arabic at 28pt]

\disabledirectives[filters.utf.reorder]
\noheaderandfooterlines

\setupwhitespace[big]
% \setupinterlinespace[line=4.2ex]

\starttext
% \startTEXpage[offset=1ex]
\setupdirections[bidi=global,method=one]
\righttoleft
\ARABICFONT

خَ‍ % a

خَل

% \stopTEXpage
\stoptext
==============

Three bugs:

I. If we use start|stoptex and comment start|stopTeXpage, then both lines  
19 and 21 give an error:

=======
tex error       > tex error on line 20 in file ./test.tex:

lua error:

	callback error: [string  
"C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2058: attempt to index  
a number value (local 'chainstep')
stack traceback:
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2058: in  
upvalue 'chainrun'
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2941: in  
function <[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2514>
	(...tail calls...)
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2065: in  
upvalue 'chainrun'
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2941: in  
local 'handler'
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:3999: in  
field '?'
	...eXt/tex/texmf-context/tex/context/base/mkxl/node-fnt.lmt:459: in  
upvalue 'nodes_handlers_characters'
	[string "local tonut  = nodes.tonut..."]:23: in function <[string "local  
tonut  = nodes.tonut..."]:12>
	(...tail calls...)	

10     \setupwhitespace[big]
11     % \setupinterlinespace[line=4.2ex]
12
13     \starttext
14     % \startTEXpage[offset=1ex]
15     \setupdirections[bidi=global,method=one]
16     \righttoleft
17     \ARABICFONT
18
19     خَ‍
20 >>
21     خَل
22
23     % \stopTEXpage
24     \stoptext
=======

Comment line 19 and yu will get virtually the same error.

II. Using start|stopTeXpage, only line 21 gives the error:

=======
tex error       > tex error on line 22 in file ./test.tex:

lua error:

	callback error: [string  
"C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2058: attempt to index  
a number value (local 'chainstep')
stack traceback:
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2058: in  
upvalue 'chainrun'
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2941: in  
function <[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2514>
	(...tail calls...)
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2065: in  
upvalue 'chainrun'
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:2941: in  
local 'handler'
	[string "C:/ConTeXt/tex/texmf-context/tex/context/base..."]:3999: in  
field '?'
	...eXt/tex/texmf-context/tex/context/base/mkxl/node-fnt.lmt:459: in  
upvalue 'nodes_handlers_characters'
	[string "local tonut  = nodes.tonut..."]:23: in function <[string "local  
tonut  = nodes.tonut..."]:12>
	(...tail calls...)	

12
13     % \starttext
14     \startTEXpage[offset=1ex]
15     \setupdirections[bidi=global,method=one]
16     \righttoleft
17     \ARABICFONT
18
19     خَ‍ % a
20
21     خَل
22 >>
23     \stopTEXpage
24     % \stoptext
=======

III Let us switch to almfixed:

If you comment line 21 and use only line 19, then there is no tex error,  
but the result is rendered incorrectly - see test-broken.pdf.

For the correct result, see test-correct.pdf (add a space and any letter -  
uncomment the end of line 19).

Adobe Naskh is not publicly available. The four commented fonts are  
publicly available and generate no tex errors.

Best wishes
Idris
-- 
Idris Samawi Hamid, Professor
Department of Philosophy
Colorado State University
Fort Collins, CO 80512
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2021-11-10 16:00 LMTX error processing Adobe Arabic Naskh font Idris Samawi Hamid ادريس سماوي حامد via ntg-context
2021-11-10 16:04 ` Idris Samawi Hamid ادريس سماوي حامد via ntg-context
2021-11-13 23:13 ` Idris Samawi Hamid ادريس سماوي حامد via ntg-context

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