From: Mohammad Hossein Bateni <bateni@gmail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Paragraph breaking bug with BiDi text
Date: Fri, 8 Jan 2016 22:47:56 -0500 [thread overview]
Message-ID: <CAMHZ1dZ6BHuyGb-H323-rPKujm+-dOOQZc9VbKooH3+uHPRbFg@mail.gmail.com> (raw)
In-Reply-To: <CAMHZ1dZ0=BFnz3x-SC1iBK=5ytoxfXRFOuKPXQqHqoi5Bu-gSA@mail.gmail.com>
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Minor point: changing "\pardir TLT" to "\pardir TLT\textdir TLT" in the
last paragraph produces better visual, however, the previous paragraphs
already demonstrate the problem sufficiently.
On Fri, Jan 8, 2016 at 10:40 PM, Mohammad Hossein Bateni <bateni@gmail.com>
wrote:
> Hello,
>
> When a line ends with a sequence whose direction differs from that of the
> paragraph, we risk pushing some text into the margin (when not necessary).
> Here is an example with corresponding output:
>
>
> \usemodule[simplefonts]
> \setmainfont[ALM Fixed][features=arabic,range=arabic]
> \setupalign[r2l]
> \setupwhitespace[big]
> \showframe
>
> \starttext
>
> % 10 copies of Persian word "hello" stay on one line.
> \dorecurse{10}{سلام }
> % 20 copies makes a 2-line paragraph.
> \dorecurse{20}{سلام }
>
> % one copy of the word goes into the margin although the Latin letters
> perfectly fit the line.
> \dorecurse{10}{سلام }
> {\textdir TLT\dorecurse{20}{a}}
> \dorecurse{10}{سلام }
>
> % although the Latin string extends into the margin, TeX still puts one
> copy of "hello" there as well.
> \dorecurse{10}{سلام }
> {\textdir TLT\dorecurse{30}{a}}
> \dorecurse{10}{سلام }
>
> % something similar happens here with the opposite par/text dir
> \pardir TLT
> \dorecurse{10}{bidi }
> {\textdir TRT\dorecurse{20}{آ}}
> \dorecurse{10}{bidi }
>
> \stoptext
>
>
> The problem seems to be that after typesetting the LTR text within the RTL
> paragraph, TeX thinks the current text ends at the left end of the LTR
> portion; hence, it tries to add something to the line; it's only after that
> that it discovers we ran into the margin!
>
> —MHB
>
>
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next prev parent reply other threads:[~2016-01-09 3:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-09 3:40 Mohammad Hossein Bateni
2016-01-09 3:47 ` Mohammad Hossein Bateni [this message]
2016-01-11 13:43 ` Hans Hagen
2016-01-11 16:58 ` Mohammad Hossein Bateni
2016-01-11 19:24 ` Wolfgang Schuster
2016-01-11 21:52 ` Hans Hagen
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