de.blizzy.documentr.markdown.DocumentrLinkRenderer.java Source code

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Here is the source code for de.blizzy.documentr.markdown.DocumentrLinkRenderer.java

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/*
documentr - Edit, maintain, and present software documentation on the web.
Copyright (C) 2012-2013 Maik Schreiber
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package de.blizzy.documentr.markdown;

import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.pegdown.LinkRenderer;
import org.pegdown.ast.ExpLinkNode;
import org.pegdown.ast.Node;
import org.pegdown.ast.WikiLinkNode;
import org.springframework.util.Assert;

import de.blizzy.documentr.util.Util;

class DocumentrLinkRenderer extends LinkRenderer {
    private HtmlSerializerContext context;

    DocumentrLinkRenderer(HtmlSerializerContext context) {
        Assert.notNull(context);

        this.context = context;
    }

    /*
     * allows the following Wiki-style links:
     *
     * [[URI]]
     * [[URI | nofollow]]
     * [[URI link text]]
     * [[URI link text | nofollow]]
     * [[=attachment]]
     * [[=attachment | nofollow]]
     * [[=attachment link text]]
     * [[=attachment link text | nofollow]]
     * [[#Headline]]
     */
    @Override
    public Rendering render(WikiLinkNode node) {
        String text = node.getText();
        String uri;
        boolean noFollow = false;
        if (text.startsWith("#")) { //$NON-NLS-1$
            text = text.substring(1).trim();
            uri = "#" + Util.simplifyForUrl(text); //$NON-NLS-1$
        } else {
            uri = StringUtils.substringBefore(text, " ").trim(); //$NON-NLS-1$
            text = StringUtils.substringAfter(text, " "); //$NON-NLS-1$
            String params = StringUtils.substringAfter(text, "|").trim(); //$NON-NLS-1$
            text = StringUtils.substringBefore(text, "|"); //$NON-NLS-1$

            if (uri.startsWith("=")) { //$NON-NLS-1$
                if (StringUtils.isBlank(text)) {
                    text = uri.substring(1);
                }

                uri = context.getAttachmentUri(uri.substring(1));
            } else {
                if (StringUtils.isBlank(text)) {
                    text = uri;
                }
            }

            text = text.trim();

            if (params.equalsIgnoreCase("nofollow")) { //$NON-NLS-1$
                noFollow = true;
            }
        }
        Rendering rendering = new Rendering(uri, text);
        if (noFollow) {
            rendering.withAttribute(Attribute.NO_FOLLOW);
        }
        return rendering;
    }

    /*
     * allows the following link:
     *
     * [text](:page)
     * [text](#Headline)
     */
    @Override
    public Rendering render(ExpLinkNode node, String text) {
        if (node.url.startsWith("#")) { //$NON-NLS-1$
            List<Node> children = node.getChildren();
            Node child = !children.isEmpty() ? children.get(0) : null;
            String url = "#" + Util.simplifyForUrl(node.url.substring(1)); //$NON-NLS-1$
            node = new ExpLinkNode(node.title, url, child);
        } else if (node.url.startsWith(":")) { //$NON-NLS-1$
            List<Node> children = node.getChildren();
            Node child = !children.isEmpty() ? children.get(0) : null;
            String url = context.getPageUri(node.url.substring(1));
            node = new ExpLinkNode(node.title, url, child);
        }
        return super.render(node, text);
    }
}