blob: 9a6bb821a29ca651dedeac7e5fe3306bc5026b53 [file] [log] [blame]
// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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.gitiles.doc;
import com.google.common.base.CharMatcher;
import com.google.common.base.Strings;
import org.commonmark.node.Heading;
import org.commonmark.node.Node;
import org.commonmark.node.Text;
class MarkdownUtil {
/** Combine child nodes as string; this must be escaped for HTML. */
static String getInnerText(Node node) {
if (node == null || node.getFirstChild() == null) {
return null;
}
StringBuilder b = new StringBuilder();
appendTextFromChildren(b, node);
return Strings.emptyToNull(b.toString().trim());
}
private static void appendTextFromChildren(StringBuilder b, Node node) {
for (Node c = node.getFirstChild(); c != null; c = c.getNext()) {
if (c instanceof Text) {
b.append(((Text) c).getLiteral());
} else {
appendTextFromChildren(b, c);
}
}
}
static String getTitle(Node node) {
if (node instanceof Heading) {
if (((Heading) node).getLevel() == 1) {
return getInnerText(node);
}
return null;
}
for (Node c = node.getFirstChild(); c != null; c = c.getNext()) {
String title = getTitle(c);
if (title != null) {
return title;
}
}
return null;
}
static void trimPreviousWhitespace(Node node) {
Node prev = node.getPrevious();
if (prev instanceof Text) {
Text prevText = (Text) prev;
String s = prevText.getLiteral();
prevText.setLiteral(CharMatcher.whitespace().trimTrailingFrom(s));
}
}
private MarkdownUtil() {}
}