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Unicode Bidirectional Algorithm #5642

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avidseeker opened this issue Dec 31, 2024 · 0 comments
Open

Unicode Bidirectional Algorithm #5642

avidseeker opened this issue Dec 31, 2024 · 0 comments
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feature request New feature or request

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@avidseeker
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avidseeker commented Dec 31, 2024

Description

typst offers a way to specify text direction:

dir The dominant direction for text and inline objects. Possible values are:

auto: Automatically infer the direction from the lang property.
ltr: Layout text from left to right.
rtl: Layout text from right to left.

However, this has to be done manually for every paragraph.

Unicode specifies Unicode Bidirectional Algorithm (UBA) for programs to automatically detect the directionality of each paragraph.

GTK implements UBA. If the following sample text is pasted in a GTK text editor, it will automatically align text accordingly.

قِفَا نَبْكِ مِنْ ذِكْرَى حَبِيبٍ ومَنْزِلِ، بِسِقْطِ اللِّوَى بَيْنَ الدَّخُول فَحَوْمَلِ. فَتُوْضِحَ فَالمِقْراةِ لمْ يَعْفُ
رَسْمُها، لِمَا نَسَجَتْهَا مِنْ جَنُوبٍ وشَمْألِ. تَرَى بَعَرَ الأرْآمِ فِي عَرَصَاتِهَا، وَقِيْعَانِهَا كَأنَّهُ حَبُّ
فُلْفُلِ. كَأنِّي غَدَاةَ البَيْنِ يَوْمَ تَحَمَّلُوا، لَدَى سَمُرَاتِ الحَيِّ نَاقِفُ حَنْظَلِ. وُقُوْفًا بِهَا صَحْبِي عَليَّ
مَطِيَّهُمُ، يَقُوْلُوْنَ: لا تَهْلِكْ أَسًى وَتَجَمَّلِ. وإِنَّ شِفائِيَ عَبْرَةٌ مُهْرَاقَةٌ، فَهَلْ عِنْدَ رَسْمٍ دَارِسٍ مِنْ
مُعَوَّلِ؟. كَدَأْبِكَ مِنْ أُمِّ الحُوَيْرِثِ قَبْلَهَا، وَ­جَارَتِهَا أُمِّ الرَّبَابِ بِمَأْسَلِ. إِذَا قَامَتَا تَضَوَّعَ المِسْكُ
مِنْهُمَا، نَسِيْمَ الصَّبَا جَاءَتْ بِرَيَّا القَرَنْفُلِ. فَفَاضَتْ دُمُوْعُ العَيْنِ مِنِّي صَبَابَةً، عَلَى النَّحْرِ حَتَّى
بَلَّ دَمْعِيَ مِحْمَلِي.

Lorem ipsum dolor sit amet, co­nsetetur sadipscing elitr, sed diam nonumy eirmod
tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At
vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren,
no sea takimata sanctus est Lorem ipsum dolor sit amet.

image

Use Case

Auto detecting dir.

Consider the case of a bilingual document with many alternating paragraph directions. Toggling dir between every set of paragraphs would be cumbersome.

@avidseeker avidseeker added the feature request New feature or request label Dec 31, 2024
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