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package Torello.CSS;

import java.util.Vector;

import Torello.Java.Additional.ByRef;

import java.util.stream.IntStream;
import java.util.function.Consumer;

/**
 * It has been patently decided that neither {@code 'BadStr'} nor {@code 'BadURL'} will have
 * constructors.
 */
@Torello.JavaDoc.JDHeaderBackgroundImg(EmbedTagFileID="CSS_TOK")
public class BadURL 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
    // ********************************************************************************************
    // ********************************************************************************************


    BadURL(final int[] css, final int sPos, final int ePos)
    { super(css, sPos, ePos); }

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

    @Override
    public final BadURL ifBadURL () { return this; }


    // ********************************************************************************************
    // ********************************************************************************************
    // CONSUME
    // ********************************************************************************************
    // ********************************************************************************************


    // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
    // Copied from: 
    // https://drafts.csswg.org/css-syntax-3/#consume-the-remnants-of-a-bad-url
    // April 2024
    // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
    // 
    // 4.3.15. Consume the remnants of a bad url
    // 
    // This section describes how to consume the remnants of a bad url from a stream of code
    // points, "cleaning up" after the tokenizer realizes that it’s in the middle of a
    // <bad-url-token> rather than a <url-token>. It returns nothing; its sole use is to consume
    // enough of the input stream to reach a recovery point where normal tokenizing can resume.
    // 
    // Repeatedly consume the next input code point from the stream:
    // 
    // **   U+0029 RIGHT PARENTHESIS ())
    //      EOF
    //      ==> Return.
    // 
    // **   the input stream starts with a valid escape
    //      ==> Consume an escaped code point. This allows an escaped right parenthesis ("\)") to
    //          be encountered without ending the <bad-url-token>. This is otherwise identical to
    //          the "anything else" clause.
    // 
    // **   anything else
    //      Do nothing.

    /**
     * This is a tokenizer method which <B>"consumes"</B> the next {@code BadURL}-Token from the
     * input Code-Point Array.
     * 
     * <EMBED CLASS=defs DATA-TOK=BadURL-Token DATA-URL=consume-the-remnants-of-a-bad-url
     *  DATA-OP=Consume>
     * <EMBED CLASS=external-html DATA-FILE-ID=COPIED_CSS_WG>
     * <EMBED CLASS=external-html DATA-FILE-ID=BAD_URL_TOKEN>
     */
    protected static void consume(                          // When invoked from 'CSSTokenizer'
            final int[]                 css,                // C, int[] css
            final ByRef<Integer>        POS,                // P, array-pos loop-variable
            final Consumer<CSSToken>    returnParsedToken,  // T, Vector<CSSToken>.add
            final int                   sPos
        )
    {
        int pos;
        for (pos=sPos; pos < css.length; pos++)

            if (css[pos] == ')')
                { pos++; break; }

            else if ((css[pos] == '\\') && ((pos+1) < css.length) && (css[pos+1] == ')'))
                pos++;

        returnParsedToken.accept(new BadURL(css, sPos, pos));
        POS.f = pos;
    }
}