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/*
* Copyright 2011 gitblit.com.
*
* 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.gitblit.utils;
import static org.pegdown.Extensions.ALL;
import static org.pegdown.Extensions.ANCHORLINKS;
import static org.pegdown.Extensions.SMARTYPANTS;
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.text.MessageFormat;
import org.apache.commons.io.IOUtils;
import org.pegdown.LinkRenderer;
import org.pegdown.ParsingTimeoutException;
import org.pegdown.PegDownProcessor;
import org.pegdown.ast.RootNode;
import com.gitblit.IStoredSettings;
import com.gitblit.Keys;
import com.gitblit.wicket.MarkupProcessor.WorkaroundHtmlSerializer;
/**
* Utility methods for transforming raw markdown text to html.
*
* @author James Moger
*
*/
public class MarkdownUtils {
/**
* Returns the html version of the plain source text.
*
* @param text
* @return html version of plain text
* @throws java.text.ParseException
*/
public static String transformPlainText(String text) {
// url auto-linking
text = text.replaceAll("((http|https)://[0-9A-Za-z-_=\\?\\.\\$#&/]*)", "<a href=\"$1\">$1</a>");
String html = "<pre>" + text + "</pre>";
return html;
}
/**
* Returns the html version of the markdown source text.
*
* @param markdown
* @return html version of markdown text
* @throws java.text.ParseException
*/
public static String transformMarkdown(String markdown) {
return transformMarkdown(markdown, null);
}
/**
* Returns the html version of the markdown source text.
*
* @param markdown
* @return html version of markdown text
* @throws java.text.ParseException
*/
public static String transformMarkdown(String markdown, LinkRenderer linkRenderer) {
try {
PegDownProcessor pd = new PegDownProcessor(ALL & ~SMARTYPANTS & ~ANCHORLINKS);
RootNode astRoot = pd.parseMarkdown(markdown.toCharArray());
return new WorkaroundHtmlSerializer(linkRenderer == null ? new LinkRenderer() : linkRenderer).toHtml(astRoot);
} catch (ParsingTimeoutException e) {
return null;
}
}
/**
* Returns the html version of the markdown source reader. The reader is
* closed regardless of success or failure.
*
* @param markdownReader
* @return html version of the markdown text
* @throws java.text.ParseException
*/
public static String transformMarkdown(Reader markdownReader) throws IOException {
// Read raw markdown content and transform it to html
StringWriter writer = new StringWriter();
try {
IOUtils.copy(markdownReader, writer);
String markdown = writer.toString();
return transformMarkdown(markdown);
} finally {
try {
writer.close();
} catch (IOException e) {
// IGNORE
}
}
}
/**
* Transforms GFM (Github Flavored Markdown) to html.
* Gitblit does not support the complete GFM specification.
*
* @param input
* @param repositoryName
* @return html
*/
public static String transformGFM(IStoredSettings settings, String input, String repositoryName) {
String text = input;
// strikethrough
text = text.replaceAll("~~(.*)~~", "<s>$1</s>");
text = text.replaceAll("\\{(?:-){2}(.*)(?:-){2}}", "<s>$1</s>");
// underline
text = text.replaceAll("\\{(?:\\+){2}(.*)(?:\\+){2}}", "<u>$1</u>");
// strikethrough, replacement
text = text.replaceAll("\\{~~(.*)~>(.*)~~}", "<s>$1</s><u>$2</u>");
// highlight
text = text.replaceAll("\\{==(.*)==}", "<span class='highlight'>$1</span>");
String canonicalUrl = settings.getString(Keys.web.canonicalUrl, "https://localhost:8443");
// emphasize and link mentions
String mentionReplacement = String.format(" **[@$1](%1s/user/$1)**", canonicalUrl);
text = text.replaceAll("\\s@([A-Za-z0-9-_]+)", mentionReplacement);
// link ticket refs
String ticketReplacement = MessageFormat.format("$1[#$2]({0}/tickets?r={1}&h=$2)$3", canonicalUrl, repositoryName);
text = text.replaceAll("([\\s,]+)#(\\d+)([\\s,:\\.\\n])", ticketReplacement);
// link commit shas
int shaLen = settings.getInteger(Keys.web.shortCommitIdLength, 6);
String commitPattern = MessageFormat.format("\\s([A-Fa-f0-9]'{'{0}'}')([A-Fa-f0-9]'{'{1}'}')", shaLen, 40 - shaLen);
String commitReplacement = String.format(" [`$1`](%1$s/commit?r=%2$s&h=$1$2)", canonicalUrl, repositoryName);
text = text.replaceAll(commitPattern, commitReplacement);
String html = transformMarkdown(text);
return html;
}
}
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