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A Less CSS compiler written completely in Java (pure Java).
There is a newer version: 1.12
/**
 * MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015 Volker Berlin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * UT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author Volker Berlin
 * @license: The MIT license 
 */
package com.inet.lib.less;

import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;

/**
 * Hold all extends that was executed.
 */
class LessExtendMap {

    private final HashMultimap all          = new HashMultimap<>();

    private final HashMultimap exact        = new HashMultimap<>();

    // use a LinkedHashSet as cache to remove duplicates and hold the original order
    private LinkedHashSet selectorList                  = new LinkedHashSet<>();

    void add( LessExtend lessExtend, String[] mainSelector ) {
        if( mainSelector == null ) {
            mainSelector = lessExtend.getSelectors();
        } else {
            mainSelector = SelectorUtils.merge( mainSelector, lessExtend.getSelectors() );
        }
        if( mainSelector[0].startsWith( "@media" ) ) {
            //TODO handling of scope
            return;
        }
        String[] extendingSelectors = lessExtend.getExtendingSelectors();
        if( lessExtend.isAll() ) {
            LessExtendResult extend = new LessExtendResult( mainSelector, extendingSelectors );
            for( String selector : extendingSelectors ) {
                SelectorTokenizer tokenizer = new SelectorTokenizer( selector );
                do {
                    String token = tokenizer.next();
                    if( token == null ) {
                        break;
                    }
                    all.add( token, extend );
                } while( true );
            }
        } else {
            for( String selector : extendingSelectors ) {
                exact.add( selector, mainSelector );
            }
        }
    }

    /**
     * Add to the given selectors all possible extends and return the resulting selectors.
     * @param selectors current selectors
     * @return the selectors concatenate with extends or the original if there are no etends.
     */
    public String[] concatenateExtends( String[] selectors ) {
        selectorList.clear();
        for( String selector : selectors ) {
            List list = exact.get( selector );
            if( list != null ) {
                for( String[] lessExtend : list ) {
                    for( String sel : lessExtend ) {
                        selectorList.add( sel );
                    }
                }
            }
            SelectorTokenizer tokenizer = new SelectorTokenizer( selector );
            do {
                String token = tokenizer.next();
                if( token == null ) {
                    break;
                }
                List results = all.get( token );
                if( results != null ) {
                    for( LessExtendResult lessExtend : results ) {
                        for( String extendingSelector : lessExtend.getExtendingSelectors() ) {
                            if( selector.contains( extendingSelector ) ) {
                                for( String replace : lessExtend.getSelectors() ) {
                                    selectorList.add( selector.replace( extendingSelector, replace ) );
                                }
                            }
                        }
                    }
                }
            } while( true );
        }

        if( selectorList.size() > 0 ) {
            int off = selectors.length;
            selectors = Arrays.copyOf( selectors, off + selectorList.size() );
            for( String str : selectorList ) {
                selectors[off++] = str;
            }
        }
        return selectors;
    }
}