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KefirBB is a Java-library for text processing. Initially it was developed for BB2HTML translation. But flexible configuration allows to use it in different cases. For example for parsing Markdown, Textile, and for HTML filtration.

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package org.kefirsf.bb.proc;

/**
 * A blank line
 *
 * @author kefir
 */
public class ProcBlankLine extends AbstractEol {
    /**
     * White space characters.
     */
    private static final char[] WS = {
            '\u0020', '\u00A0', '\u180E', '\u2000', '\u2001', '\u2002', '\u2003', '\u2004', '\u2005',
            '\u2006', '\u2007', '\u2008', '\u2009', '\u200A', '\u200B', '\u202F', '\u205F', '\u3000',
            '\u0009', '\uFEFF'
    };

    public ProcBlankLine(boolean ghost) {
        super(ghost);
    }

    /**
     * @param source text source
     * @param index  index in the text
     * @return length of the blank line or -1
     */
    protected int match(Source source, int index) {
        int ind = index;

        // First line break
        int len = calcLength(source, ind);
        if (len < 0) {
            return -1;
        }
        ind += len;

        // Whitespaces
        while (ind < source.length() && whitespace(source.charAt(ind))) {
            ind++;
        }

        // Second line break can be 0
        len = calcLength(source, ind);
        if (len < 0) {
            return -1;
        }
        ind += len;

        return ind - index;
    }

    private boolean whitespace(char c) {
        for (char p : WS) {
            if(c == p){
                return true;
            }
        }
        return false;
    }

    @Override
    public String toString() {
        StringBuilder b = new StringBuilder();
        b.append("");

        return b.toString();
    }
}