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Unicode Utilities: BIDI (UBA)

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Shows processing by the UBA (Unicode Bidi Algorithm), which is used to display all Unicode Arabic and Hebrew text. For more information, see bidi info.

This Java implementation supports UBA rules and character properties as of Unicode 6.2. To test current UBA rules, or intermediate versions from Unicode 6.3 forward, see the C Reference demo.

Sample
mark 3.1% مارْك 2.0.

Auto LTR RTL Paragraph Direction ASCII Hack?

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Paragraph 1

Base Level	0 = LTR	heuristic

Source

Memory Position	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
Character	m	a	r	k		3	.	1	%		‎م‎	‎ا‎	‎ر‎	ْ	‎ك‎		2	.	0	.
Bidi Class	L	L	L	L	WS	EN	CS	EN	ET	WS	AL	AL	AL	NSM	AL	WS	EN	CS	EN	CS
Rules Applied					N1→L	W7→L	W4→EN W7→L	W7→L	W5→EN W7→L	N2→L	W3→R	W3→R	W3→R	W1→AL W3→R	W3→R	N1→R	W2→AN	W4→AN	W2→AN	W6→ON N2→L
Resulting Level	L0	L0	L0	L0	L0	L0	L0	L0	L0	L0	L1	L1	L1	L1	L1	L1	L2	L2	L2	L0

Reordered

Display Position	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
Memory Position	0	1	2	3	4	5	6	7	8	9	16	17	18	15	14	13	12	11	10	19
Character	m	a	r	k		3	.	1	%		2	.	0		‎ك‎	ْ	‎ر‎	‎ا‎	‎م‎	.