/*
- * Sone - FreenetLinkParser.java - Copyright © 2010 David Roden
+ * Sone - SoneTextParser.java - Copyright © 2010–2013 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
package net.pterodactylus.sone.text;
+import static com.google.common.base.Optional.absent;
+import static com.google.common.base.Optional.of;
+import static com.google.common.collect.FluentIterable.from;
+
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.net.MalformedURLException;
+import java.util.Comparator;
+import java.util.EnumMap;
+import java.util.Map.Entry;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
-import net.pterodactylus.sone.core.PostProvider;
-import net.pterodactylus.sone.core.SoneProvider;
import net.pterodactylus.sone.data.Post;
import net.pterodactylus.sone.data.Sone;
+import net.pterodactylus.sone.data.impl.DefaultSone;
+import net.pterodactylus.sone.database.Database;
+import net.pterodactylus.util.io.Closer;
import net.pterodactylus.util.logging.Logging;
+
+import com.google.common.base.Optional;
import freenet.keys.FreenetURI;
/**
private enum LinkType {
/** Link is a KSK. */
- KSK,
+ KSK("KSK@", true, false),
/** Link is a CHK. */
- CHK,
+ CHK("CHK@", true, false),
/** Link is an SSK. */
- SSK,
+ SSK("SSK@", true, false),
/** Link is a USK. */
- USK,
+ USK("USK@", true, false),
/** Link is HTTP. */
- HTTP,
+ HTTP("http://", false, true),
/** Link is HTTPS. */
- HTTPS,
+ HTTPS("https://", false, true),
/** Link is a Sone. */
- SONE,
+ SONE("sone://", false, false),
/** Link is a post. */
- POST,
+ POST("post://", false, false);
- }
+ /** The scheme identifying this link type. */
+ private final String scheme;
+ private final boolean freenetLink;
+ private final boolean internetLink;
- /** The Sone provider. */
- private final SoneProvider soneProvider;
+ /**
+ * Creates a new link type identified by the given scheme.
+ *
+ * @param scheme
+ * The scheme of the link type
+ * @param freenetLink
+ */
+ private LinkType(String scheme, boolean freenetLink, boolean internetLink) {
+ this.scheme = scheme;
+ this.freenetLink = freenetLink;
+ this.internetLink = internetLink;
+ }
+
+ /**
+ * Returns the scheme of this link type.
+ *
+ * @return The scheme of this link type
+ */
+ public String getScheme() {
+ return scheme;
+ }
- /** The post provider. */
- private final PostProvider postProvider;
+ public boolean isFreenetLink() {
+ return freenetLink;
+ }
+
+ public boolean isInternetLink() {
+ return internetLink;
+ }
+
+ }
+
+ private final Database database;
/**
* Creates a new freenet link parser.
*
- * @param soneProvider
- * The Sone provider
- * @param postProvider
- * The post provider
+ * @param database
*/
- public SoneTextParser(SoneProvider soneProvider, PostProvider postProvider) {
- this.soneProvider = soneProvider;
- this.postProvider = postProvider;
+ public SoneTextParser(Database database) {
+ this.database = database;
}
//
// PART METHODS
//
- /**
- * {@inheritDoc}
- */
@Override
public Iterable<Part> parse(SoneTextParserContext context, Reader source) throws IOException {
PartContainer parts = new PartContainer();
BufferedReader bufferedReader = (source instanceof BufferedReader) ? (BufferedReader) source : new BufferedReader(source);
- String line;
- boolean lastLineEmpty = true;
- int emptyLines = 0;
- while ((line = bufferedReader.readLine()) != null) {
- if (line.trim().length() == 0) {
- if (lastLineEmpty) {
- continue;
- }
- parts.add(new PlainTextPart("\n"));
- ++emptyLines;
- lastLineEmpty = emptyLines == 2;
- continue;
- }
- emptyLines = 0;
- /*
- * lineComplete tracks whether the block you are parsing is the
- * first block of the line. this is important because sometimes you
- * have to add an additional line break.
- */
- boolean lineComplete = true;
- while (line.length() > 0) {
- int nextKsk = line.indexOf("KSK@");
- int nextChk = line.indexOf("CHK@");
- int nextSsk = line.indexOf("SSK@");
- int nextUsk = line.indexOf("USK@");
- int nextHttp = line.indexOf("http://");
- int nextHttps = line.indexOf("https://");
- int nextSone = line.indexOf("sone://");
- int nextPost = line.indexOf("post://");
- if ((nextKsk == -1) && (nextChk == -1) && (nextSsk == -1) && (nextUsk == -1) && (nextHttp == -1) && (nextHttps == -1) && (nextSone == -1) && (nextPost == -1)) {
- if (lineComplete && !lastLineEmpty) {
- parts.add(new PlainTextPart("\n" + line));
- } else {
- parts.add(new PlainTextPart(line));
+ try {
+ String line;
+ boolean lastLineEmpty = true;
+ int emptyLines = 0;
+ while ((line = bufferedReader.readLine()) != null) {
+ if (line.trim().length() == 0) {
+ if (lastLineEmpty) {
+ continue;
}
- break;
- }
- int next = Integer.MAX_VALUE;
- LinkType linkType = null;
- if ((nextKsk > -1) && (nextKsk < next)) {
- next = nextKsk;
- linkType = LinkType.KSK;
- }
- if ((nextChk > -1) && (nextChk < next)) {
- next = nextChk;
- linkType = LinkType.CHK;
- }
- if ((nextSsk > -1) && (nextSsk < next)) {
- next = nextSsk;
- linkType = LinkType.SSK;
- }
- if ((nextUsk > -1) && (nextUsk < next)) {
- next = nextUsk;
- linkType = LinkType.USK;
- }
- if ((nextHttp > -1) && (nextHttp < next)) {
- next = nextHttp;
- linkType = LinkType.HTTP;
- }
- if ((nextHttps > -1) && (nextHttps < next)) {
- next = nextHttps;
- linkType = LinkType.HTTPS;
- }
- if ((nextSone > -1) && (nextSone < next)) {
- next = nextSone;
- linkType = LinkType.SONE;
- }
- if ((nextPost > -1) && (nextPost < next)) {
- next = nextPost;
- linkType = LinkType.POST;
+ parts.add(new PlainTextPart("\n"));
+ ++emptyLines;
+ lastLineEmpty = emptyLines == 2;
+ continue;
}
- if (linkType == LinkType.SONE) {
- if (next > 0) {
+ emptyLines = 0;
+ /*
+ * lineComplete tracks whether the block you are parsing is the
+ * first block of the line. this is important because sometimes
+ * you have to add an additional line break.
+ */
+ boolean lineComplete = true;
+ while (line.length() > 0) {
+ Optional<NextLink> nextLink = findNextLink(line);
+ if (!nextLink.isPresent()) {
if (lineComplete && !lastLineEmpty) {
- parts.add(new PlainTextPart("\n" + line.substring(0, next)));
+ parts.add(new PlainTextPart("\n" + line));
} else {
- parts.add(new PlainTextPart(line.substring(0, next)));
+ parts.add(new PlainTextPart(line));
}
+ break;
}
- if (line.length() >= (next + 7 + 43)) {
- String soneId = line.substring(next + 7, next + 50);
- Sone sone = soneProvider.getSone(soneId, false);
- if ((sone != null) && (sone.getName() != null)) {
- parts.add(new SonePart(sone));
- } else {
- parts.add(new PlainTextPart(line.substring(next, next + 50)));
- }
- line = line.substring(next + 50);
- } else {
- parts.add(new PlainTextPart(line.substring(next)));
- line = "";
+
+ int next = nextLink.get().getNextIndex();
+ LinkType linkType = nextLink.get().getLinkType();
+
+ /* cut off “freenet:” from before keys. */
+ if (linkType.isFreenetLink() && (next >= 8) && (line.substring(next - 8, next).equals("freenet:"))) {
+ next -= 8;
+ line = line.substring(0, next) + line.substring(next + 8);
+ }
+
+ /* if there is text before the next item, write it out. */
+ if (lineComplete && !lastLineEmpty) {
+ parts.add(new PlainTextPart("\n"));
}
- lineComplete = false;
- continue;
- }
- if (linkType == LinkType.POST) {
if (next > 0) {
parts.add(new PlainTextPart(line.substring(0, next)));
+ line = line.substring(next);
}
- if (line.length() >= (next + 7 + 36)) {
- String postId = line.substring(next + 7, next + 43);
- Post post = postProvider.getPost(postId, false);
- if ((post != null) && (post.getSone() != null)) {
- parts.add(new PostPart(post));
+ lineComplete = false;
+
+ int nextSpace = findNextWhitespace(line);
+ String link = line.substring(0, nextSpace);
+ String name = link;
+ logger.log(Level.FINER, String.format("Found link: %s", link));
+
+ /* if there is no text after the scheme, it’s not a link! */
+ if (link.equals(linkType.getScheme())) {
+ parts.add(new PlainTextPart(linkType.getScheme()));
+ line = line.substring(linkType.getScheme().length());
+ continue;
+ }
+
+ if (linkType == LinkType.SONE) {
+ if (line.length() >= (7 + 43)) {
+ String soneId = line.substring(7, 50);
+ Optional<Sone> sone = database.getSone(soneId);
+ if (!sone.isPresent()) {
+ /*
+ * don’t use create=true above, we don’t want
+ * the empty shell.
+ */
+ sone = Optional.<Sone>of(new DefaultSone(database, soneId, false, null));
+ }
+ parts.add(new SonePart(sone.get()));
+ line = line.substring(50);
} else {
- parts.add(new PlainTextPart(line.substring(next, next + 43)));
+ parts.add(new PlainTextPart(line));
+ line = "";
}
- line = line.substring(next + 43);
- } else {
- parts.add(new PlainTextPart(line.substring(next)));
- line = "";
+ continue;
}
- continue;
- }
- if ((next >= 8) && (line.substring(next - 8, next).equals("freenet:"))) {
- next -= 8;
- line = line.substring(0, next) + line.substring(next + 8);
- }
- Matcher matcher = whitespacePattern.matcher(line);
- int nextSpace = matcher.find(next) ? matcher.start() : line.length();
- if (nextSpace > (next + 4)) {
- if (!lastLineEmpty && lineComplete) {
- parts.add(new PlainTextPart("\n" + line.substring(0, next)));
- } else {
- if (next > 0) {
- parts.add(new PlainTextPart(line.substring(0, next)));
+ if (linkType == LinkType.POST) {
+ if (line.length() >= (7 + 36)) {
+ String postId = line.substring(7, 43);
+ Optional<Post> post = database.getPost(postId);
+ if (post.isPresent()) {
+ parts.add(new PostPart(post.get()));
+ } else {
+ parts.add(new PlainTextPart(line.substring(0, 43)));
+ }
+ line = line.substring(43);
+ } else {
+ parts.add(new PlainTextPart(line));
+ line = "";
}
+ continue;
}
- String link = line.substring(next, nextSpace);
- String name = link;
- logger.log(Level.FINER, "Found link: %s", link);
- logger.log(Level.FINEST, "Next: %d, CHK: %d, SSK: %d, USK: %d", new Object[] { next, nextChk, nextSsk, nextUsk });
- if ((linkType == LinkType.KSK) || (linkType == LinkType.CHK) || (linkType == LinkType.SSK) || (linkType == LinkType.USK)) {
+ if (linkType.isFreenetLink()) {
FreenetURI uri;
if (name.indexOf('?') > -1) {
name = name.substring(0, name.indexOf('?'));
if (name == null) {
name = link.substring(0, Math.min(9, link.length()));
}
- boolean fromPostingSone = ((linkType == LinkType.SSK) || (linkType == LinkType.USK)) && (context != null) && (context.getPostingSone() != null) && link.substring(4, Math.min(link.length(), 47)).equals(context.getPostingSone().getId());
+ boolean fromPostingSone = ((linkType == LinkType.SSK) || (linkType == LinkType.USK)) && linkMatchesPostingSone(context, link);
parts.add(new FreenetLinkPart(link, name, fromPostingSone));
} catch (MalformedURLException mue1) {
/* not a valid link, insert as plain text. */
/* oh, and these, too. */
parts.add(new PlainTextPart(link));
}
- } else if ((linkType == LinkType.HTTP) || (linkType == LinkType.HTTPS)) {
- name = link.substring(linkType == LinkType.HTTP ? 7 : 8);
+ } else if (linkType.isInternetLink()) {
+ name = link.substring(linkType.getScheme().length());
int firstSlash = name.indexOf('/');
int lastSlash = name.lastIndexOf('/');
if ((lastSlash - firstSlash) > 3) {
parts.add(new LinkPart(link, name));
}
line = line.substring(nextSpace);
- } else {
- if (!lastLineEmpty && lineComplete) {
- parts.add(new PlainTextPart("\n" + line.substring(0, next + 4)));
- } else {
- parts.add(new PlainTextPart(line.substring(0, next + 4)));
- }
- line = line.substring(next + 4);
}
- lineComplete = false;
+ lastLineEmpty = false;
+ }
+ } finally {
+ if (bufferedReader != source) {
+ Closer.close(bufferedReader);
}
- lastLineEmpty = false;
}
+ removeTrailingWhitespaceParts(parts);
+ return parts;
+ }
+
+ private void removeTrailingWhitespaceParts(PartContainer parts) {
for (int partIndex = parts.size() - 1; partIndex >= 0; --partIndex) {
Part part = parts.getPart(partIndex);
- if (!(part instanceof PlainTextPart) || !"\n".equals(((PlainTextPart) part).getText())) {
+ if (!(part instanceof PlainTextPart) || !"\n".equals(part.getText())) {
break;
}
parts.removePart(partIndex);
}
- return parts;
+ }
+
+ private boolean linkMatchesPostingSone(SoneTextParserContext context, String link) {
+ return (context != null) && (context.getPostingSone() != null) && link.substring(4, Math.min(link.length(), 47)).equals(context.getPostingSone().getId());
+ }
+
+ private int findNextWhitespace(String line) {
+ Matcher matcher = whitespacePattern.matcher(line);
+ return matcher.find(0) ? matcher.start() : line.length();
+ }
+
+ private Optional<NextLink> findNextLink(String line) {
+ EnumMap<LinkType, Integer> linkTypeIndexes = new EnumMap<LinkType, Integer>(LinkType.class);
+ for (LinkType linkType : LinkType.values()) {
+ int index = line.indexOf(linkType.getScheme());
+ if (index != -1) {
+ linkTypeIndexes.put(linkType, index);
+ }
+ }
+ if (linkTypeIndexes.isEmpty()) {
+ return absent();
+ }
+ Entry<LinkType, Integer> smallestEntry = from(linkTypeIndexes.entrySet()).toSortedList(locateSmallestIndex()).get(0);
+ return of(new NextLink(smallestEntry.getValue(), smallestEntry.getKey()));
+ }
+
+ private Comparator<Entry<LinkType, Integer>> locateSmallestIndex() {
+ return new Comparator<Entry<LinkType, Integer>>() {
+ @Override
+ public int compare(Entry<LinkType, Integer> leftEntry, Entry<LinkType, Integer> rightEntry) {
+ return leftEntry.getValue() - rightEntry.getValue();
+ }
+ };
+ }
+
+ /**
+ * Container for position and type of the next link in a line.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private static class NextLink {
+
+ private final int nextIndex;
+ private final LinkType linkType;
+
+ private NextLink(int nextIndex, LinkType linkType) {
+ this.nextIndex = nextIndex;
+ this.linkType = linkType;
+ }
+
+ private int getNextIndex() {
+ return nextIndex;
+ }
+
+ private LinkType getLinkType() {
+ return linkType;
+ }
+
}
}
projects / Sone.git / blobdiff