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Bidirectional script support is the capability of a computer system to correctly display bidirectional text. The term is often shortened to "BiDi" or "bidi".Early computer installations were designed only to support a single writing system, typically for left-to-right scripts based on the Latin alphabet only.
One of Unicode's major features is support of bi-directional (Bidi) text display right-to-left (R-to-L) and left-to-right (L-to-R). The Unicode Bidirectional Algorithm UAX9 [20] describes the process of presenting text with altering script directions. For example, it enables a Hebrew quote in an English text.
The implicit directional marks are non-printing characters used in the computerized typesetting of bi-directional text containing mixed left-to-right scripts (such as Latin and Cyrillic) and right-to-left scripts (such as Persian, Arabic, Syriac and Hebrew).
1. ^ Unicode Bidirectional Algorithm (UAX#9), As of Unicode version 16.0 2. ^ Possible Bidirectional character types for character property: Bidi_Class or 'type' 3. ^ Bidi_Control characters: Twelve Bidi_Control formatting characters are defined. They are invisible, and have no effect apart from directionality.
A woman writing in Persian in right-to-left direction, with a notebook computer displaying right-to-left text. Right-to-left, top-to-bottom text is supported in common computer software. [1] Often, this support must be explicitly enabled. Right-to-left text can be mixed with left-to-right text in bi-directional text.
In the second line, bidirectional display has been applied, and in the third the glyph-shaping mechanism has rendered the letters according to context. Complex text layout (CTL) or complex text rendering is the typesetting of writing systems in which the shape or positioning of a grapheme depends on its relation
an algorithm for laying out bidirectional text ("the BiDi algorithm"), where text on the same line may shift between left-to-right ("LTR") and right-to-left ("RTL") a case-folding algorithm; Computer software end users enter these characters into programs through various input methods, for example, physical keyboards or virtual character palettes.
This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (July 2019) (Learn how and when to remove this message) This article compares Unicode encodings in two types of environments: 8-bit clean environments, and environments that forbid the use of byte values with the ...