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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;

/**
 * An interface to provide text reordering services.
 * Must use a proper algorithm rather than reverse string to allow
 * for surrogate pairs, control characters, etc.
 */
public interface BidiReorderer {
	public String reorderRTLTextToLTR(String text);
	
	/**
	 * Arabic character shapes depends on whether a character is at the
	 * start, end or middle of a word. This algorithm aims to change the characters
	 * depending on their context.
	 */
	public String shapeText(String text);
	
	/**
	 * Deshape text, for use if the shaped character is not in a font.
	 */
	public String deshapeText(String text);

	/**
	 * Useful for optimization.
	 */
	public boolean isLiveImplementation();
}