// LinkToken.java
// ---------
// part of YaCy
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2007
// Created 22.02.2007
//
// This file is contributed by Franz Brausze
//
// $LastChangedDate: $
// $LastChangedRevision: $
// $LastChangedBy: $
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.
package de.anomic.data.wiki.tokens;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import de.anomic.data.bookmarksDB;
import de.anomic.data.bookmarksDB.Bookmark;
import de.anomic.data.bookmarksDB.Tag;
import de.anomic.data.wiki.wikiParserException;
import de.anomic.plasma.plasmaSwitchboard;
public class LinkToken extends AbstractToken {
private static final int IMG = 0;
private static final int BKM = 1;
private static final int INT = 2;
private static final int EXT = 3;
private static final Pattern imgPattern = Pattern.compile(
"\\[\\[" + // begin
"(Image:([^\\]|]|\\][^\\]])*)" + // "Image:" + URL
"(" + // <optional>
"(\\|(bottom|left|center|right|middle|top))?" + // optional align
"(\\|(([^\\]]|\\][^\\]])*))" + // description
")?" + // </optional>
"\\]\\]"); // end
private static final Pattern bkmPattern = Pattern.compile(
"\\[\\[" + // begin
"(Bookmark:([^\\]|]|\\][^\\]])*)" + // "Bookmark:" + URL
"(\\|(([^\\]]|\\][^\\]])*?))?" + // optional description
"\\]\\]"); // end
private static final Pattern intPattern = Pattern.compile(
"\\[\\[" + // begin
"(([^\\]|]|\\][^\\]])*?)" + // wiki-page
"(\\|(([^\\]]|\\][^\\]])*?))?" + // optional desciption
"\\]\\]"); // end
private static final Pattern extPattern = Pattern.compile(
"\\[" + // begin
"([^\\] ]*)" + // URL
"( ([^\\]]*))?" + // optional description
"\\]"); // end
private static final Pattern[] patterns = new Pattern[] {
imgPattern, bkmPattern, intPattern, extPattern };
private final String localhost;
private final String wikiPath;
private final plasmaSwitchboard sb;
private int patternNr = 0;
public LinkToken(String localhost, String wikiPath, plasmaSwitchboard sb) {
this.localhost = localhost;
this.wikiPath = wikiPath;
this.sb = sb;
}
protected void parse() throws wikiParserException {
StringBuffer sb = new StringBuffer();
if (this.patternNr < 0 || this.patternNr >= patterns.length)
throw new wikiParserException("patternNr was not set correctly: " + this.patternNr);
Matcher m = patterns[this.patternNr].matcher(this.text);
if (!m.find())
throw new wikiParserException("Didn't find match for: (" + this.patternNr + ") " + this.text);
switch (this.patternNr) {
case IMG:
sb.append("<img src=\"").append(formatHref(m.group(1).substring(6))).append("\"");
if (m.group(5) != null) sb.append(" align=\"").append(m.group(5)).append("\"");
sb.append(" alt=\"").append((m.group(7) == null) ? formatHref(m.group(1).substring(6)) : m.group(7)).append("\"");
sb.append(" />");
break;
case BKM:
Link[] links = getLinksFromBookmarkTag(m.group(2));
if (links == null) {
sb.append("<span class=\"error\">Couldn't find Bookmark-Tag '").append(m.group(2)).append("'.</span>");
} else {
appendLinks(links, sb);
}
break;
case INT:
sb.append(new Link(
"http://" + this.localhost + "/" + this.wikiPath + m.group(1),
m.group(4),
(m.group(4) == null) ? m.group(1) : m.group(4)
).toString());
break;
case EXT:
sb.append(new Link(
m.group(1),
m.group(3),
(m.group(3) == null) ? m.group(1) : m.group(3)
).toString());
break;
}
this.parsed = true;
this.markup = new String(sb);
}
private String formatHref(String link) {
if (link.indexOf("://") == -1) { // DATA/HTDOCS-link
return "http://" + this.localhost + "/share/" + link;
} else { // 'normal' link
return link;
}
}
private StringBuffer appendLinks(Link[] links, StringBuffer sb) {
for (int i=0; i<links.length; i++)
sb.append(links[i].toString());
return sb;
}
private Link[] getLinksFromBookmarkTag(String tagName) {
Tag tag = this.sb.bookmarksDB.getTag(bookmarksDB.tagHash(tagName));
if (tag == null) return null;
ArrayList<Link> r = new ArrayList<Link>();
Iterator<String> it = tag.getUrlHashes().iterator();
String hash;
Bookmark bm;
while (it.hasNext())
if ((hash = it.next()) != null)
if ((bm = this.sb.bookmarksDB.getBookmark(hash)) != null)
r.add(new Link(bm.getUrl(), bm.getTitle(), bm.getDescription()));
return (Link[]) r.toArray(new Link[r.size()]);
}
private static class Link {
private final String href;
private final String title;
private final String desc;
public Link(String href, String title, String desc) {
this.href = href;
this.title = title;
this.desc = desc;
}
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("<a href=\"").append(this.href).append("\"");
if (this.title != null) sb.append(" title=\"").append(this.title).append("\"");
sb.append(">");
if (this.desc == null) sb.append(this.href); else sb.append(this.desc);
sb.append("</a>");
return new String(sb);
}
}
public String[] getBlockElementNames() { return null; }
public Pattern[] getRegex() { return patterns; }
public boolean setText(String text, int patternNr) {
this.text = text;
this.patternNr = patternNr;
this.parsed = false;
if (text == null) { this.markup = null; this.patternNr = -1; }
return true;
}
}