Unicode Utilities: BIDI (UBA)

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.

Paragraph Direction ASCII Hack?

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	.