/**
 * 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 <http://opensource.org/licenses/MIT>
 */
package com.inet.lib.less;

import javax.annotation.Nullable;

/**
 * Split a Selector string in single selectors.
 */
class SelectorTokenizer {

    private final String selector;

    private int          idx, lastIdx;

    /**
     * Create a new tokenizer. 
     * @param selector all selectors
     */
    SelectorTokenizer( String selector ) {
        this.selector = selector;
    }

    /**
     * Get the next selector.
     * @return the next or null
     */
    @Nullable
    String next() {
        if( lastIdx >= selector.length() ) {
            return null;
        }
        LOOP: do {
            if( ++idx == selector.length() ) {
                break LOOP;
            }
            switch( selector.charAt( idx ) ) {
                case '.':
                case '#':
                case ':':
                    break LOOP;
            }
        } while( true );
        String str = selector.substring( lastIdx, idx ).trim();
        lastIdx = idx;
        return str;
    }
}

/**
 * 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 <http://opensource.org/licenses/MIT>
 */
package com.inet.lib.less;

import javax.annotation.Nullable;

/**
 * Split a Selector string in single selectors.
 */
class SelectorTokenizer {

    private final String selector;

    private int          idx, lastIdx;

    /**
     * Create a new tokenizer. 
     * @param selector all selectors
     */
    SelectorTokenizer( String selector ) {
        this.selector = selector;
    }

    /**
     * Get the next selector.
     * @return the next or null
     */
    @Nullable
    String next() {
        if( lastIdx >= selector.length() ) {
            return null;
        }
        LOOP: do {
            if( ++idx == selector.length() ) {
                break LOOP;
            }
            switch( selector.charAt( idx ) ) {
                case '.':
                case '#':
                case ':':
                case '[':
                    break LOOP;
            }
        } while( true );
        String str = selector.substring( lastIdx, idx ).trim();
        lastIdx = idx;
        return str;
    }
}

Support :extend for selectors with square bracket like [data="test"]