com.google.gitiles.doc.MarkdownUtil.java Source code

Introduction

Here is the source code for com.google.gitiles.doc.MarkdownUtil.java

Source

// 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.Strings;

import org.pegdown.ast.HeaderNode;
import org.pegdown.ast.Node;
import org.pegdown.ast.TextNode;

class MarkdownUtil {
    /** Check if anchor URL is like {@code /top.md}. */
    static boolean isAbsolutePathToMarkdown(String url) {
        return url.length() >= 5 && url.charAt(0) == '/' && url.charAt(1) != '/' && url.endsWith(".md");
    }

    /** Combine child nodes as string; this must be escaped for HTML. */
    static String getInnerText(Node node) {
        if (node == null || node.getChildren().isEmpty()) {
            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 child : node.getChildren()) {
            if (child instanceof TextNode) {
                b.append(((TextNode) child).getText());
            } else {
                appendTextFromChildren(b, child);
            }
        }
    }

    static String getTitle(Node node) {
        if (node instanceof HeaderNode) {
            if (((HeaderNode) node).getLevel() == 1) {
                return getInnerText(node);
            }
            return null;
        }

        for (Node child : node.getChildren()) {
            String title = getTitle(child);
            if (title != null) {
                return title;
            }
        }
        return null;
    }

    private MarkdownUtil() {
    }
}