Add parser for freenet URIs.

diff --git a/src/main/java/net/pterodactylus/sone/text/FreenetLinkParser.java b/src/main/java/net/pterodactylus/sone/text/FreenetLinkParser.java
new file mode 100644 (file)
index 0000000..7749b00
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/text/FreenetLinkParser.java
@@ -0,0 +1,144 @@
+/*
+ * Sone - FreenetLinkParser.java - Copyright © 2010 David Roden
+ *
+ * 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 net.pterodactylus.sone.text;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import net.pterodactylus.util.logging.Logging;
+import net.pterodactylus.util.template.TemplateFactory;
+
+/**
+ * {@link Parser} implementation that can recognize Freenet URIs.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class FreenetLinkParser implements Parser {
+
+       /** The logger. */
+       private static final Logger logger = Logging.getLogger(FreenetLinkParser.class);
+
+       /** Pattern to detect whitespace. */
+       private static final Pattern whitespacePattern = Pattern.compile("[\\p{javaWhitespace}]");
+
+       /** The template factory. */
+       private final TemplateFactory templateFactory;
+
+       /**
+        * Creates a new freenet link parser.
+        *
+        * @param templateFactory
+        *            The template factory
+        */
+       public FreenetLinkParser(TemplateFactory templateFactory) {
+               this.templateFactory = templateFactory;
+       }
+
+       //
+       // PART METHODS
+       //
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public Part parse(Reader source) throws IOException {
+               PartContainer parts = new PartContainer();
+               BufferedReader bufferedReader = (source instanceof BufferedReader) ? (BufferedReader) source : new BufferedReader(source);
+               String line;
+               while ((line = bufferedReader.readLine()) != null) {
+                       line = line.trim() + "\n";
+                       while (line.length() > 0) {
+                               int nextKsk = line.indexOf("KSK@");
+                               int nextChk = line.indexOf("CHK@");
+                               int nextSsk = line.indexOf("SSK@");
+                               int nextUsk = line.indexOf("USK@");
+                               if ((nextKsk == -1) && (nextChk == -1) && (nextSsk == -1) && (nextUsk == -1)) {
+                                       parts.add(createPlainTextPart(line));
+                                       break;
+                               }
+                               int next = Integer.MAX_VALUE;
+                               if ((nextKsk > -1) && (nextKsk < next)) {
+                                       next = nextKsk;
+                               }
+                               if ((nextChk > -1) && (nextChk < next)) {
+                                       next = nextChk;
+                               }
+                               if ((nextSsk > -1) && (nextSsk < next)) {
+                                       next = nextSsk;
+                               }
+                               if ((nextUsk > -1) && (nextUsk < next)) {
+                                       next = nextUsk;
+                               }
+                               Matcher matcher = whitespacePattern.matcher(line);
+                               int nextSpace = matcher.find(next) ? matcher.start() : line.length();
+                               if (nextSpace > (next + 4)) {
+                                       parts.add(createPlainTextPart(line.substring(0, next)));
+                                       String link = line.substring(next, nextSpace);
+                                       String name = link;
+                                       logger.log(Level.FINER, "Found link: " + link);
+                                       logger.log(Level.FINEST, "Next: %d, CHK: %d, SSK: %d, USK: %d", new Object[] { next, nextChk, nextSsk, nextUsk });
+                                       if (((next == nextChk) || (next == nextSsk) || (next == nextUsk)) && (link.length() > 98) && (link.charAt(47) == ',') && (link.charAt(91) == ',') && (link.charAt(99) == '/')) {
+                                               name = link.substring(0, 47) + "…" + link.substring(99);
+                                       }
+                                       parts.add(createLinkPart(link, name));
+                                       line = line.substring(nextSpace);
+                               } else {
+                                       parts.add(createPlainTextPart(line.substring(0, next + 4)));
+                                       line = line.substring(next + 4);
+                               }
+                       }
+               }
+               return parts;
+       }
+
+       //
+       // PRIVATE METHODS
+       //
+
+       /**
+        * Creates a new plain text part based on a template.
+        *
+        * @param text
+        *            The text to display
+        * @return The part that displays the given text
+        */
+       private Part createPlainTextPart(String text) {
+               return new TemplatePart(templateFactory.createTemplate(new StringReader("<% text|html>"))).set("text", text);
+       }
+
+       /**
+        * Creates a new link part based on a template.
+        *
+        * @param link
+        *            The target of the link
+        * @param name
+        *            The name of the link
+        * @return The part that displays the link
+        */
+       private Part createLinkPart(String link, String name) {
+               return new TemplatePart(templateFactory.createTemplate(new StringReader("<a href=\"/<% link|html>\"><% name|html></a>"))).set("link", link).set("name", name);
+       }
+
+}