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package Torello.CSS;

import java.util.Vector;

/**
 * CSS-Tokenizer Class for the <B>Comment-Delimiter Close</B> Token.
 */
@Torello.JavaDoc.JDHeaderBackgroundImg(EmbedTagFileID="CSS_TOK")
public class CDC extends CSSToken
    implements CharSequence, java.io.Serializable, Comparable<CharSequence>
{
    /** <EMBED CLASS='external-html' DATA-FILE-ID=SVUID> */
    protected static final long serialVersionUID = 1;


    // ********************************************************************************************
    // ********************************************************************************************
    // Private Constructor, API "is" and "if" Methods
    // ********************************************************************************************
    // ********************************************************************************************


    static final CDC SINGLETON = new CDC();

    private CDC() { super("-->"); }

    @Override 
    public final boolean isCDC() { return true; }

    @Override
    public final CDC ifCDC() { return this; }


    // ********************************************************************************************
    // ********************************************************************************************
    // Tokenizer's "is" Method(s)
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * Checks whether or not the next three code-point / characters are {@code '-', '-'} and
     * {@code '>'}.
     * 
     * <EMBED CLASS=defs DATA-TOK="Comment-Delimiter Open" DATA-URL=CDC-token-diagram
     *      DATA-OP=Consume>
     * <EMBED CLASS=external-html DATA-FILE-ID=COPIED_CSS_WG_RR>
     * <EMBED CLASS=external-html DATA-FILE-ID=CDC_TOK_SVG>  
     * @param css CSS-{@code String} as an array of code-points.
     * @param sPos The array-index where the tokenizer is to consume its next token
     * @return {@code TRUE} if and only if the next token in the array  is a {@code CDC}
     */
    public static boolean is(int[] css, int sPos)
    {
        final int c1 = ((sPos + 0) < css.length) ? css[sPos + 0] : 0;
        final int c2 = ((sPos + 1) < css.length) ? css[sPos + 1] : 0;
        final int c3 = ((sPos + 2) < css.length) ? css[sPos + 2] : 0;

        return (c1 == '-') && (c2 == '-') && (c3 == '>');
    }
}