/*

 * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.javadoc.internal.doclets.formats.html.markup;

import java.io.IOException;

import java.io.Writer;

import jdk.javadoc.internal.doclets.toolkit.Content;

import jdk.javadoc.internal.doclets.toolkit.util.DocletConstants;

/**

 * Class for generating raw HTML content to be added to HTML pages of javadoc output.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 *

 * @author Bhavesh Patel

 */

public class RawHtml extends Content {

    private final String rawHtmlContent;

    public static final Content nbsp = new RawHtml(" ");

    /**

     * Constructor to construct a RawHtml object.

     *

     * @param rawHtml raw HTML text to be added

     */

    public RawHtml(CharSequence rawHtml) {

        rawHtmlContent = rawHtml.toString();

    }

    /**

     * This method is not supported by the class.

     *

     * @param content content that needs to be added

     */

    public void addContent(Content content) {

    }

    /**

     * This method is not supported by the class.

     *

     * @param stringContent string content that needs to be added

     */

    @Override

    public void addContent(CharSequence stringContent) {

    }

    /**

     * {@inheritDoc}

     */

    public boolean isEmpty() {

        return rawHtmlContent.isEmpty();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public String toString() {

        return rawHtmlContent;

    }

    private enum State { TEXT, ENTITY, TAG, STRING }

    @Override

    public int charCount() {

        return charCount(rawHtmlContent);

    }

    static int charCount(CharSequence htmlText) {

        State state = State.TEXT;

        int count = 0;

        for (int i = 0; i < htmlText.length(); i++) {

            char c = htmlText.charAt(i);

            switch (state) {

                case TEXT:

                    switch (c) {

                        case '<':

                            state = State.TAG;

                            break;

                        case '&':

                            state = State.ENTITY;

                            count++;

                            break;

                        default:

                            count++;

                    }

                    break;

                case ENTITY:

                    if (!Character.isLetterOrDigit(c))

                        state = State.TEXT;

                    break;

                case TAG:

                    switch (c) {

                        case '"':

                            state = State.STRING;

                            break;

                        case '>':

                            state = State.TEXT;

                            break;

                    }

                    break;

                case STRING:

                    switch (c) {

                        case '"':

                            state = State.TAG;

                            break;

                    }

            }

        }

        return count;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public boolean write(Writer out, boolean atNewline) throws IOException {

        out.write(rawHtmlContent);

        return rawHtmlContent.endsWith(DocletConstants.NL);

    }

}