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jStyleParser is a CSS parser written in Java. It has its own application interface that is designed to allow an efficient CSS processing in Java and mapping the values to the Java data types. It parses CSS 2.1 style sheets into structures that can be efficiently assigned to DOM elements. It is intended be the primary CSS parser for the CSSBox library. While handling errors, it is user agent conforming according to the CSS specification.

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package cz.vutbr.web.csskit;

import java.util.Arrays;

import cz.vutbr.web.css.CombinedSelector;
import cz.vutbr.web.css.Selector;

/**
 * CSS CombinedSelector with implementation of specificity
 * 
 * @author kapy
 * @author Jan Svercl, VUT Brno, 2008
 * 
 */
public class CombinedSelectorImpl extends AbstractRule implements CombinedSelector {
  
	protected CombinedSelectorImpl() {
	}
	
	public Selector getLastSelector() throws UnsupportedOperationException {
		if(list.size()==0)
			throw new UnsupportedOperationException("There is no \"last\" simple selector");
		return list.get(list.size()-1);
	}
	
    @Override
    public Selector.PseudoElementType getPseudoElementType() {
        return getLastSelector().getPseudoElementType(); //pseudo-elements may only be appended after the last simple selector of the selector
    }
	
	/**
	 * Computes specificity of selector
	 */
	public Specificity computeSpecificity() {
		
		Specificity spec = new SpecificityImpl();
		
		for(Selector s: list) 
			s.computeSpecificity(spec);
			
		return spec;
		
	}
	

	public String toString(int depth) {

		StringBuilder sb = new StringBuilder();
		sb = OutputUtil.appendList(sb, list, OutputUtil.EMPTY_DELIM);
		
		return sb.toString();
	}
	
    @Override
    public String toString() {
    	return this.toString(0);
    }       
    
	public static class SpecificityImpl implements Specificity {
			
		protected int[] spec = new int[Level.values().length];
		
		public int compareTo(Specificity o) {
			
			if(get(Level.A) > o.get(Level.A)) return 1;
			else if(get(Level.A) < o.get(Level.A)) return -1;
			
			if(get(Level.B) > o.get(Level.B)) return 1;
			else if(get(Level.B) < o.get(Level.B)) return -1;
			
			if(get(Level.C) > o.get(Level.C)) return 1;
			else if(get(Level.C) < o.get(Level.C)) return -1;
			
			if(get(Level.D) > o.get(Level.D)) return 1;
			else if(get(Level.D) < o.get(Level.D)) return -1;
			
			return 0;
			
		}
		
		public int get(Level level) {
			
			switch(level) {
			case A: return spec[0];
			case B: return spec[1];
			case C: return spec[2];
			case D: return spec[3];
			default: return 0;
			}
		}
		
		public void add(Level level) {
			
			switch(level) {
			case A: spec[0]++;
			case B: spec[1]++;
			case C: spec[2]++;
			case D: spec[3]++;
			}
		}

		/* (non-Javadoc)
		 * @see java.lang.Object#hashCode()
		 */
		@Override
		public int hashCode() {
			final int prime = 31;
			int result = 1;
			result = prime * result + Arrays.hashCode(spec);
			return result;
		}

		/* (non-Javadoc)
		 * @see java.lang.Object#equals(java.lang.Object)
		 */
		@Override
		public boolean equals(Object obj) {
			if (this == obj)
				return true;
			if (obj == null)
				return false;
			if (!(obj instanceof SpecificityImpl))
				return false;
			SpecificityImpl other = (SpecificityImpl) obj;
			if (!Arrays.equals(spec, other.spec))
				return false;
			return true;
		}
		
		
	}
	
}