Image.java

/***************************************************************************************
 * Copyright (c) 2009 Edu Zamora <edu.zasu@gmail.com>                                   *
 *                                                                                      *
 * This program is free software; you can redistribute it and/or modify it under        *
 * the terms of the GNU General Public License as published by the Free Software        *
 * Foundation; either version 3 of the License, or (at your option) any later           *
 * version.                                                                             *
 *                                                                                      *
 * This program 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 for more details.             *
 *                                                                                      *
 * You should have received a copy of the GNU General Public License along with         *
 * this program.  If not, see <http://www.gnu.org/licenses/>.                           *
 ****************************************************************************************/

package com.ichi2.anki.model;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Class used to display and handle correctly images.
 */
public class Image {
	
	public static Logger log = LoggerFactory.getLogger(Image.class);

    /**
     * Pattern used to identify img tags
     */
    public static Pattern sImagePattern = Pattern
            .compile("(?i)<img[^<>(src)]*src\\s*=\\s*(\"[^\"]*\"|'[^']*'|[^'\">]+)[^<>]*>");


    /* Prevent class from being instantiated */
    private Image() { }


    /**
     * Parses the content (belonging to deck deckFilename), adding an onload event to the img tags, that will be useful
     * in order to resize them.
     *
     * @param deckFilename Deck's filename whose content is being parsed
     * @param content HTML content of a card
     * @return content Content with the onload events for the img tags
     */
    public static String parseImages(String deckFilename, String content) {

        StringBuilder stringBuilder = new StringBuilder();
        String contentLeft = content;

        log.info("parseImages");
        Matcher matcher = sImagePattern.matcher(content);
        while (matcher.find()) {
            String img = matcher.group(1);
            // log.info("Image " + matcher.groupCount() + ": " + img);

            String imgTag = matcher.group();
            int markerStart = contentLeft.indexOf(imgTag);
            stringBuilder.append(contentLeft.substring(0, markerStart));
            stringBuilder.append("<img src=" + img + " onload=\"resizeImage();\">");

            contentLeft = contentLeft.substring(markerStart + imgTag.length());
            // log.info("Content left = " + contentLeft);
        }

        stringBuilder.append(contentLeft);

        return stringBuilder.toString();
    }
}