/*
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* Copyright 2011 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.utils;
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import static org.pegdown.Extensions.ALL;
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import static org.pegdown.Extensions.ANCHORLINKS;
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import static org.pegdown.Extensions.SMARTYPANTS;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.StringWriter;
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import java.text.MessageFormat;
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import org.apache.commons.io.IOUtils;
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import org.pegdown.LinkRenderer;
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import org.pegdown.ParsingTimeoutException;
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import org.pegdown.PegDownProcessor;
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import org.pegdown.ast.RootNode;
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import com.gitblit.IStoredSettings;
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import com.gitblit.Keys;
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import com.gitblit.wicket.MarkupProcessor.WorkaroundHtmlSerializer;
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/**
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* Utility methods for transforming raw markdown text to html.
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*
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* @author James Moger
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*
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*/
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public class MarkdownUtils {
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/**
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* Returns the html version of the plain source text.
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*
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* @param text
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* @return html version of plain text
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* @throws java.text.ParseException
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*/
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public static String transformPlainText(String text) {
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// url auto-linking
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text = text.replaceAll("((http|https)://[0-9A-Za-z-_=\\?\\.\\$#&/]*)", "<a href=\"$1\">$1</a>");
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String html = "<pre>" + text + "</pre>";
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return html;
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}
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/**
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* Returns the html version of the markdown source text.
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*
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* @param markdown
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* @return html version of markdown text
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* @throws java.text.ParseException
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*/
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public static String transformMarkdown(String markdown) {
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return transformMarkdown(markdown, null);
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}
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/**
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* Returns the html version of the markdown source text.
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*
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* @param markdown
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* @return html version of markdown text
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* @throws java.text.ParseException
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*/
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public static String transformMarkdown(String markdown, LinkRenderer linkRenderer) {
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try {
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PegDownProcessor pd = new PegDownProcessor(ALL & ~SMARTYPANTS & ~ANCHORLINKS);
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RootNode astRoot = pd.parseMarkdown(markdown.toCharArray());
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return new WorkaroundHtmlSerializer(linkRenderer == null ? new LinkRenderer() : linkRenderer).toHtml(astRoot);
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} catch (ParsingTimeoutException e) {
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return null;
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}
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}
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/**
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* Returns the html version of the markdown source reader. The reader is
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* closed regardless of success or failure.
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*
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* @param markdownReader
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* @return html version of the markdown text
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* @throws java.text.ParseException
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*/
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public static String transformMarkdown(Reader markdownReader) throws IOException {
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// Read raw markdown content and transform it to html
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StringWriter writer = new StringWriter();
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try {
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IOUtils.copy(markdownReader, writer);
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String markdown = writer.toString();
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return transformMarkdown(markdown);
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} finally {
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try {
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writer.close();
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} catch (IOException e) {
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// IGNORE
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}
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}
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}
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/**
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* Transforms GFM (Github Flavored Markdown) to html.
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* Gitblit does not support the complete GFM specification.
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*
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* @param input
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* @param repositoryName
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* @return html
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*/
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public static String transformGFM(IStoredSettings settings, String input, String repositoryName) {
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String text = input;
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// strikethrough
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text = text.replaceAll("~~(.*)~~", "<s>$1</s>");
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text = text.replaceAll("\\{(?:-){2}(.*)(?:-){2}}", "<s>$1</s>");
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// underline
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text = text.replaceAll("\\{(?:\\+){2}(.*)(?:\\+){2}}", "<u>$1</u>");
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// strikethrough, replacement
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text = text.replaceAll("\\{~~(.*)~>(.*)~~}", "<s>$1</s><u>$2</u>");
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// highlight
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text = text.replaceAll("\\{==(.*)==}", "<span class='highlight'>$1</span>");
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String canonicalUrl = settings.getString(Keys.web.canonicalUrl, "https://localhost:8443");
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// emphasize and link mentions
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String mentionReplacement = String.format(" **[@$1](%1s/user/$1)**", canonicalUrl);
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text = text.replaceAll("\\s@([A-Za-z0-9-_]+)", mentionReplacement);
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// link ticket refs
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String ticketReplacement = MessageFormat.format("$1[#$2]({0}/tickets?r={1}&h=$2)$3", canonicalUrl, repositoryName);
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text = text.replaceAll("([\\s,]+)#(\\d+)([\\s,:\\.\\n])", ticketReplacement);
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// link commit shas
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int shaLen = settings.getInteger(Keys.web.shortCommitIdLength, 6);
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String commitPattern = MessageFormat.format("\\s([A-Fa-f0-9]'{'{0}'}')([A-Fa-f0-9]'{'{1}'}')", shaLen, 40 - shaLen);
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String commitReplacement = String.format(" [`$1`](%1$s/commit?r=%2$s&h=$1$2)", canonicalUrl, repositoryName);
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text = text.replaceAll(commitPattern, commitReplacement);
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String html = transformMarkdown(text);
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return html;
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}
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}
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