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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.

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package com.openhtmltopdf.bidi;

public interface BidiSplitter {
    public static final byte LTR = 0;
    public static final byte RTL = 1;
	public static final byte NEUTRAL = 3;
    
    /**
     * Sets the text which is to be split on visual ordering.
     * @param paragraph
     * @param defaultDirection either LTR or RTL
     */
    public void setParagraph(String paragraph, byte defaultDirection);
    
    /**
     * Count the number of runs, each of which contains text in one visual order only.
     * Can only be called after setParagraph has run the BIDI algorithm.
     */
    public int countTextRuns();
	
    /**
     * @param runIndex from zero to countTextRuns.
     * @return information about a visual run.
     */
    public BidiTextRun getVisualRun(int runIndex);
    
    /**
     * Get the base direction of a paragraph. Defined as the first 
     * character that has strong directionality or neutral if they are all neutral characters.
     */
    public byte getBaseDirection(String paragraph);
}