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// Copyright (C) 2012 The Android Open Source Project
//
// 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.google.gerrit.server.documentation;
import static com.vladsch.flexmark.profiles.pegdown.Extensions.ALL;
import static com.vladsch.flexmark.profiles.pegdown.Extensions.HARDWRAPS;
import static com.vladsch.flexmark.profiles.pegdown.Extensions.SUPPRESS_ALL_HTML;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.base.Strings;
import com.google.common.flogger.FluentLogger;
import com.vladsch.flexmark.Extension;
import com.vladsch.flexmark.ast.Block;
import com.vladsch.flexmark.ast.Heading;
import com.vladsch.flexmark.ast.Node;
import com.vladsch.flexmark.ast.util.TextCollectingVisitor;
import com.vladsch.flexmark.html.HtmlRenderer;
import com.vladsch.flexmark.parser.Parser;
import com.vladsch.flexmark.profiles.pegdown.PegdownOptionsAdapter;
import com.vladsch.flexmark.util.options.MutableDataHolder;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.lang.StringEscapeUtils;
import org.eclipse.jgit.util.RawParseUtils;
import org.eclipse.jgit.util.TemporaryBuffer;
public class MarkdownFormatter {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private static final String defaultCss;
static {
AtomicBoolean file = new AtomicBoolean();
String src;
try {
src = readFlexMarkJavaCss(file);
} catch (IOException err) {
logger.atWarning().withCause(err).log("Cannot load flexmark-java.css");
src = "";
}
defaultCss = file.get() ? null : src;
}
private static String readCSS() {
if (defaultCss != null) {
return defaultCss;
}
try {
return readFlexMarkJavaCss(new AtomicBoolean());
} catch (IOException err) {
logger.atWarning().withCause(err).log("Cannot load flexmark-java.css");
return "";
}
}
private boolean suppressHtml;
private String css;
public MarkdownFormatter suppressHtml() {
suppressHtml = true;
return this;
}
public MarkdownFormatter setCss(String css) {
this.css = StringEscapeUtils.escapeHtml(css);
return this;
}
private MutableDataHolder markDownOptions() {
int options = ALL & ~(HARDWRAPS);
if (suppressHtml) {
options |= SUPPRESS_ALL_HTML;
}
MutableDataHolder optionsExt =
PegdownOptionsAdapter.flexmarkOptions(
options, MarkdownFormatterHeader.HeadingExtension.create())
.toMutable();
ArrayList<Extension> extensions = new ArrayList<>();
for (Extension extension : optionsExt.get(com.vladsch.flexmark.parser.Parser.EXTENSIONS)) {
extensions.add(extension);
}
return optionsExt;
}
public byte[] markdownToDocHtml(String md, String charEnc) throws UnsupportedEncodingException {
Node root = parseMarkdown(md);
HtmlRenderer renderer = HtmlRenderer.builder(markDownOptions()).build();
String title = findTitle(root);
StringBuilder html = new StringBuilder();
html.append("<html>");
html.append("<head>");
if (!Strings.isNullOrEmpty(title)) {
html.append("<title>").append(title).append("</title>");
}
html.append("<style type=\"text/css\">\n");
if (css != null) {
html.append(css);
} else {
html.append(readCSS());
}
html.append("\n</style>");
html.append("</head>");
html.append("<body>\n");
html.append(renderer.render(root));
html.append("\n</body></html>");
return html.toString().getBytes(charEnc);
}
public String extractTitleFromMarkdown(byte[] data, String charEnc) {
String md = RawParseUtils.decode(Charset.forName(charEnc), data);
return findTitle(parseMarkdown(md));
}
private String findTitle(Node root) {
if (root instanceof Heading) {
Heading h = (Heading) root;
if (h.getLevel() == 1 && h.hasChildren()) {
TextCollectingVisitor collectingVisitor = new TextCollectingVisitor();
return collectingVisitor.collectAndGetText(h);
}
}
if (root instanceof Block && root.hasChildren()) {
Node child = root.getFirstChild();
while (child != null) {
String title = findTitle(child);
if (title != null) {
return title;
}
child = child.getNext();
}
}
return null;
}
private Node parseMarkdown(String md) {
Parser parser = Parser.builder(markDownOptions()).build();
Node document = parser.parse(md);
return document;
}
private static String readFlexMarkJavaCss(AtomicBoolean file) throws IOException {
String name = "flexmark-java.css";
URL url = MarkdownFormatter.class.getResource(name);
if (url == null) {
throw new FileNotFoundException("Resource " + name);
}
file.set("file".equals(url.getProtocol()));
try (InputStream in = url.openStream();
TemporaryBuffer.Heap tmp = new TemporaryBuffer.Heap(128 * 1024)) {
tmp.copy(in);
return new String(tmp.toByteArray(), UTF_8);
}
}
}
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