com.benfante.minimark.util.TextFilterUtils.java Source code

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Here is the source code for com.benfante.minimark.util.TextFilterUtils.java
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/**
 * Copyright (C) 2009 Lucio Benfante <lucio.benfante@gmail.com>
 *
 * This file is part of minimark Web Application.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.benfante.minimark.util;

import java.io.StringWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import net.java.textilej.parser.MarkupParser;
import net.java.textilej.parser.builder.HtmlDocumentBuilder;
import net.java.textilej.parser.markup.textile.TextileDialect;
import org.apache.commons.lang.StringEscapeUtils;

/**
 * Utility for text filtering
 *
 * @author Lucio Benfante
 */
public class TextFilterUtils {
    public static final String TEXTILE_FILTER_CODE = "textile";
    public static final String HTML_FILTER_CODE = "html";

    private static final Pattern replaceTypoCodePattern = Pattern.compile("<typo:code\\b([^>]*)>(.*?)</typo:code>",
            Pattern.DOTALL);
    private static final Pattern replaceLangPattern = Pattern.compile("lang(?:\\s)?=(?:\\s)?([\"']+.*?[\"']+)");
    private static final Pattern replaceIncompleteTypoCodePattern = Pattern.compile("<typo:code>(.*?)</typo:code>",
            Pattern.DOTALL);

    public static String formatText(String txt, String fltr) {
        String result = null;
        if (txt != null) {
            txt = filterTypoCode(txt);
            if (TEXTILE_FILTER_CODE.equals(fltr)) {
                StringWriter writer = new StringWriter();
                HtmlDocumentBuilder builder = new HtmlDocumentBuilder(writer);
                // avoid the <html> and <body> tags
                builder.setEmitAsDocument(false);
                MarkupParser parser = new MarkupParser(new TextileDialect());
                parser.setBuilder(builder);
                parser.parse(txt);
                result = writer.toString();
            } else if (HTML_FILTER_CODE.equals(fltr)) {
                result = txt;
            } else {
                result = escapeHtml(txt);
            }
        }
        return result;
    }

    public static String filterTypoCode(String txt) {
        String result = null;
        Matcher matcher = replaceIncompleteTypoCodePattern.matcher(txt);
        result = matcher.replaceAll("<pre name=\"code\" class=\"xml\">$1</pre>");
        matcher = replaceTypoCodePattern.matcher(result);
        result = matcher.replaceAll("<pre name=\"code\"$1>$2</pre>");
        matcher = replaceLangPattern.matcher(result);
        result = matcher.replaceAll("class=$1");
        return result;
    }

    public static String escapeHtml(String txt) {
        return StringEscapeUtils.escapeHtml(txt);
    }
}