X-Git-Url: https://git.pterodactylus.net/?p=Sone.git;a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fsone%2Ftext%2FSoneTextParser.java;h=81ac75150a7d31656b7344566e3fd5eddd754380;hp=94c3db48818cfab8d3cebe3186df07480302db9d;hb=7b55e0be6a3283e43a9bbab98f82aebdd948eb33;hpb=47ed7eaf00c35889781831d33d04e9f91c9ad266

diff --git a/src/main/java/net/pterodactylus/sone/text/SoneTextParser.java b/src/main/java/net/pterodactylus/sone/text/SoneTextParser.java
index 94c3db4..81ac751 100644
--- a/src/main/java/net/pterodactylus/sone/text/SoneTextParser.java
+++ b/src/main/java/net/pterodactylus/sone/text/SoneTextParser.java
@@ -1,5 +1,5 @@
 /*
- * Sone - FreenetLinkParser.java - Copyright © 2010 David Roden
+ * Sone - SoneTextParser.java - Copyright © 2010–2016 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
@@ -17,20 +17,29 @@
 
 package net.pterodactylus.sone.text;
 
+import static java.util.logging.Logger.getLogger;
+
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.Reader;
+import java.io.StringReader;
 import java.net.MalformedURLException;
 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 javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 import net.pterodactylus.sone.data.Post;
 import net.pterodactylus.sone.data.Sone;
-import net.pterodactylus.util.logging.Logging;
+import net.pterodactylus.sone.data.impl.IdOnlySone;
+import net.pterodactylus.sone.database.PostProvider;
+import net.pterodactylus.sone.database.SoneProvider;
+
+import com.google.common.base.Optional;
+
 import freenet.keys.FreenetURI;
 
 /**
@@ -41,7 +50,7 @@ import freenet.keys.FreenetURI;
 public class SoneTextParser implements Parser<SoneTextParserContext> {
 
 	/** The logger. */
-	private static final Logger logger = Logging.getLogger(SoneTextParser.class);
+	private static final Logger logger = getLogger(SoneTextParser.class.getName());
 
 	/** Pattern to detect whitespace. */
 	private static final Pattern whitespacePattern = Pattern.compile("[\\u000a\u0020\u00a0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u200c\u200d\u202f\u205f\u2060\u2800\u3000]");
@@ -53,29 +62,35 @@ public class SoneTextParser implements Parser<SoneTextParserContext> {
 	 */
 	private enum LinkType {
 
-		/** Link is a KSK. */
-		KSK,
-
-		/** Link is a CHK. */
-		CHK,
-
-		/** Link is an SSK. */
-		SSK,
-
-		/** Link is a USK. */
-		USK,
+		KSK("KSK@", true),
+		CHK("CHK@", true),
+		SSK("SSK@", true),
+		USK("USK@", true),
+		HTTP("http://", false),
+		HTTPS("https://", false),
+		SONE("sone://", false),
+		POST("post://", false);
 
-		/** Link is HTTP. */
-		HTTP,
+		private final String scheme;
+		private final boolean freenetLink;
 
-		/** Link is HTTPS. */
-		HTTPS,
+		LinkType(String scheme, boolean freenetLink) {
+			this.scheme = scheme;
+			this.freenetLink = freenetLink;
+		}
 
-		/** Link is a Sone. */
-		SONE,
+		/**
+		 * Returns the scheme of this link type.
+		 *
+		 * @return The scheme of this link type
+		 */
+		public String getScheme() {
+			return scheme;
+		}
 
-		/** Link is a post. */
-		POST,
+		public boolean isFreenetLink() {
+			return freenetLink;
+		}
 
 	}
 
@@ -105,198 +120,102 @@ public class SoneTextParser implements Parser<SoneTextParserContext> {
 	/**
 	 * {@inheritDoc}
 	 */
+	@Nonnull
 	@Override
-	public Iterable<Part> parse(SoneTextParserContext context, Reader source) throws IOException {
+	public Iterable<Part> parse(@Nonnull String source, @Nullable SoneTextParserContext context) {
 		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;
-			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 (Reader sourceReader = new StringReader(source);
+				BufferedReader bufferedReader = new BufferedReader(sourceReader)) {
+			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) {
-						parts.add(new PlainTextPart(line.substring(0, next)));
-					}
-					if (line.length() >= (next + 7 + 43)) {
-						String soneId = line.substring(next + 7, next + 50);
-						Sone sone = soneProvider.getSone(soneId, false);
-						if (sone != null) {
-							parts.add(new SonePart(sone));
+				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 = NextLink.findNextLink(line);
+					if (!nextLink.isPresent()) {
+						if (lineComplete && !lastLineEmpty) {
+							parts.add(new PlainTextPart("\n" + line));
 						} else {
-							parts.add(new PlainTextPart(line.substring(next, next + 50)));
+							parts.add(new PlainTextPart(line));
 						}
-						line = line.substring(next + 50);
-					} else {
-						parts.add(new PlainTextPart(line.substring(next)));
-						line = "";
+						break;
 					}
-					continue;
-				}
-				if (linkType == LinkType.POST) {
-					if (next > 0) {
-						parts.add(new PlainTextPart(line.substring(0, next)));
+					LinkType linkType = nextLink.get().getLinkType();
+					int next = nextLink.get().getPosition();
+
+					/* 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 (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)) {
-							String postText = post.getText();
-							postText = postText.substring(0, Math.min(postText.length(), 20)) + "…";
-							parts.add(new PostPart(post));
-						} else {
-							parts.add(new PlainTextPart(line.substring(next, next + 43)));
-						}
-						line = line.substring(next + 43);
-					} else {
-						parts.add(new PlainTextPart(line.substring(next)));
-						line = "";
+
+					/* if there is text before the next item, write it out. */
+					if (lineComplete && !lastLineEmpty) {
+						parts.add(new PlainTextPart("\n"));
 					}
-					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 (next > 0) {
+						parts.add(new PlainTextPart(line.substring(0, next)));
+						line = line.substring(next);
 					}
-					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)) {
-						FreenetURI uri;
-						if (name.indexOf('?') > -1) {
-							name = name.substring(0, name.indexOf('?'));
-						}
-						if (name.endsWith("/")) {
-							name = name.substring(0, name.length() - 1);
-						}
-						try {
-							uri = new FreenetURI(name);
-							name = uri.lastMetaString();
-							if (name == null) {
-								name = uri.getDocName();
-							}
-							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());
-							parts.add(new FreenetLinkPart(link, name, fromPostingSone));
-						} catch (MalformedURLException mue1) {
-							/* not a valid link, insert as plain text. */
-							parts.add(new PlainTextPart(link));
-						} catch (NullPointerException npe1) {
-							/* FreenetURI sometimes throws these, too. */
-							parts.add(new PlainTextPart(link));
-						} catch (ArrayIndexOutOfBoundsException aioobe1) {
-							/* 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);
-						int firstSlash = name.indexOf('/');
-						int lastSlash = name.lastIndexOf('/');
-						if ((lastSlash - firstSlash) > 3) {
-							name = name.substring(0, firstSlash + 1) + "…" + name.substring(lastSlash);
-						}
-						if (name.endsWith("/")) {
-							name = name.substring(0, name.length() - 1);
-						}
-						if (((name.indexOf('/') > -1) && (name.indexOf('.') < name.lastIndexOf('.', name.indexOf('/'))) || ((name.indexOf('/') == -1) && (name.indexOf('.') < name.lastIndexOf('.')))) && name.startsWith("www.")) {
-							name = name.substring(4);
-						}
-						if (name.indexOf('?') > -1) {
-							name = name.substring(0, name.indexOf('?'));
-						}
-						parts.add(new LinkPart(link, name));
+					lineComplete = false;
+
+					int endOfLink = findEndOfLink(line);
+					String link = line.substring(0, endOfLink);
+					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;
 					}
-					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)));
+
+					switch (linkType) {
+						case SONE:
+							renderSoneLink(parts, link);
+							break;
+						case POST:
+							renderPostLink(parts, link);
+							break;
+						case KSK:
+						case CHK:
+						case SSK:
+						case USK:
+							renderFreenetLink(parts, link, linkType, context);
+							break;
+						case HTTP:
+						case HTTPS:
+							renderHttpLink(parts, link, linkType);
+							break;
 					}
-					line = line.substring(next + 4);
+
+					line = line.substring(endOfLink);
 				}
-				lineComplete = false;
+				lastLineEmpty = false;
 			}
-			lastLineEmpty = false;
+		} catch (IOException ioe1) {
+			// a buffered reader around a string reader should never throw.
+			throw new RuntimeException(ioe1);
 		}
 		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);
@@ -304,4 +223,142 @@ public class SoneTextParser implements Parser<SoneTextParserContext> {
 		return parts;
 	}
 
+	private void renderSoneLink(PartContainer parts, String line) {
+		if (line.length() >= (7 + 43)) {
+			String soneId = line.substring(7, 50);
+			Optional<Sone> sone = soneProvider.getSone(soneId);
+			parts.add(new SonePart(sone.or(new IdOnlySone(soneId))));
+		} else {
+			parts.add(new PlainTextPart(line));
+		}
+	}
+
+	private void renderPostLink(PartContainer parts, String line) {
+		if (line.length() >= (7 + 36)) {
+			String postId = line.substring(7, 43);
+			Optional<Post> post = postProvider.getPost(postId);
+			if (post.isPresent()) {
+				parts.add(new PostPart(post.get()));
+			} else {
+				parts.add(new PlainTextPart(line.substring(0, 43)));
+			}
+		} else {
+			parts.add(new PlainTextPart(line));
+		}
+	}
+
+	private void renderFreenetLink(PartContainer parts, String link, LinkType linkType, @Nullable SoneTextParserContext context) {
+		String name = link;
+		if (name.indexOf('?') > -1) {
+			name = name.substring(0, name.indexOf('?'));
+		}
+		if (name.endsWith("/")) {
+			name = name.substring(0, name.length() - 1);
+		}
+		try {
+			FreenetURI uri = new FreenetURI(name);
+			name = uri.lastMetaString();
+			if (name == null) {
+				name = uri.getDocName();
+			}
+			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());
+			parts.add(new FreenetLinkPart(link, name, fromPostingSone));
+		} catch (MalformedURLException mue1) {
+			/* not a valid link, insert as plain text. */
+			parts.add(new PlainTextPart(link));
+		} catch (NullPointerException npe1) {
+			/* FreenetURI sometimes throws these, too. */
+			parts.add(new PlainTextPart(link));
+		} catch (ArrayIndexOutOfBoundsException aioobe1) {
+			/* oh, and these, too. */
+			parts.add(new PlainTextPart(link));
+		}
+	}
+
+	private void renderHttpLink(PartContainer parts, String link, LinkType linkType) {
+		String name;
+		name = link.substring(linkType == LinkType.HTTP ? 7 : 8);
+		int firstSlash = name.indexOf('/');
+		int lastSlash = name.lastIndexOf('/');
+		if ((lastSlash - firstSlash) > 3) {
+			name = name.substring(0, firstSlash + 1) + "…" + name.substring(lastSlash);
+		}
+		if (name.endsWith("/")) {
+			name = name.substring(0, name.length() - 1);
+		}
+		if (((name.indexOf('/') > -1) && (name.indexOf('.') < name.lastIndexOf('.', name.indexOf('/'))) || ((name.indexOf('/') == -1) && (name.indexOf('.') < name.lastIndexOf('.')))) && name.startsWith("www.")) {
+			name = name.substring(4);
+		}
+		if (name.indexOf('?') > -1) {
+			name = name.substring(0, name.indexOf('?'));
+		}
+		parts.add(new LinkPart(link, name));
+	}
+
+	private int findEndOfLink(String line) {
+		Matcher matcher = whitespacePattern.matcher(line);
+		int endOfLink = matcher.find() ? matcher.start() : line.length();
+		while ((endOfLink > 0) && isPunctuation(line.charAt(endOfLink - 1))) {
+			endOfLink--;
+		}
+		int openParens = 0;
+		for (int i = 0; i < endOfLink; i++) {
+			switch (line.charAt(i)) {
+				case '(':
+					openParens++;
+					break;
+				case ')':
+					openParens--;
+					if (openParens < 0) {
+						return i;
+					}
+				default:
+			}
+		}
+		return endOfLink;
+	}
+
+	private static boolean isPunctuation(char character) {
+		return (character == '.') || (character == ',');
+	}
+
+	private static class NextLink {
+
+		private final int position;
+		private final LinkType linkType;
+
+		private NextLink(int position, LinkType linkType) {
+			this.position = position;
+			this.linkType = linkType;
+		}
+
+		public int getPosition() {
+			return position;
+		}
+
+		public LinkType getLinkType() {
+			return linkType;
+		}
+
+		public static Optional<NextLink> findNextLink(String line) {
+			int earliestLinkPosition = Integer.MAX_VALUE;
+			LinkType linkType = null;
+			for (LinkType possibleLinkType : LinkType.values()) {
+				int nextLinkPosition = line.indexOf(possibleLinkType.getScheme());
+				if (nextLinkPosition > -1) {
+					if (nextLinkPosition < earliestLinkPosition) {
+						earliestLinkPosition = nextLinkPosition;
+						linkType = possibleLinkType;
+					}
+				}
+			}
+			return earliestLinkPosition < Integer.MAX_VALUE ?
+					Optional.of(new NextLink(earliestLinkPosition, linkType)) : Optional.<NextLink>absent();
+		}
+
+	}
+
 }