2 * Sone - ParserFilter.java - Copyright © 2011–2016 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.sone.template;
20 import static java.lang.String.valueOf;
21 import static net.pterodactylus.sone.utils.NumberParsers.parseInt;
23 import java.io.StringReader;
24 import java.io.StringWriter;
25 import java.io.UnsupportedEncodingException;
26 import java.io.Writer;
27 import java.net.URLEncoder;
28 import java.util.ArrayList;
29 import java.util.List;
32 import net.pterodactylus.sone.core.Core;
33 import net.pterodactylus.sone.data.Sone;
34 import net.pterodactylus.sone.text.FreenetLinkPart;
35 import net.pterodactylus.sone.text.LinkPart;
36 import net.pterodactylus.sone.text.Part;
37 import net.pterodactylus.sone.text.PlainTextPart;
38 import net.pterodactylus.sone.text.PostPart;
39 import net.pterodactylus.sone.text.SonePart;
40 import net.pterodactylus.sone.text.SoneTextParser;
41 import net.pterodactylus.sone.text.SoneTextParserContext;
42 import net.pterodactylus.util.template.Filter;
43 import net.pterodactylus.util.template.Template;
44 import net.pterodactylus.util.template.TemplateContext;
45 import net.pterodactylus.util.template.TemplateContextFactory;
46 import net.pterodactylus.util.template.TemplateParser;
49 * Filter that filters a given text through a {@link SoneTextParser}.
51 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
53 public class ParserFilter implements Filter {
56 private final Core core;
58 /** The link parser. */
59 private final SoneTextParser soneTextParser;
61 /** The template context factory. */
62 private final TemplateContextFactory templateContextFactory;
64 /** The template for {@link PlainTextPart}s. */
65 private static final Template plainTextTemplate = TemplateParser.parse(new StringReader("<%text|html>"));
67 /** The template for {@link FreenetLinkPart}s. */
68 private static final Template linkTemplate = TemplateParser.parse(new StringReader("<a class=\"<%cssClass|html>\" href=\"<%link|html>\" title=\"<%title|html>\"><%text|html></a>"));
71 * Creates a new filter that runs its input through a {@link SoneTextParser}
76 * @param templateContextFactory
77 * The context factory for rendering the parts
78 * @param soneTextParser
79 * The Sone text parser
81 public ParserFilter(Core core, TemplateContextFactory templateContextFactory, SoneTextParser soneTextParser) {
83 this.templateContextFactory = templateContextFactory;
84 this.soneTextParser = soneTextParser;
91 public Object format(TemplateContext templateContext, Object data, Map<String, Object> parameters) {
92 String text = valueOf(data);
93 int length = parseInt(valueOf(parameters.get("length")), -1);
94 int cutOffLength = parseInt(valueOf(parameters.get("cut-off-length")), length);
95 Object sone = parameters.get("sone");
96 if (sone instanceof String) {
97 sone = core.getSone((String) sone).orNull();
99 SoneTextParserContext context = new SoneTextParserContext((Sone) sone);
100 StringWriter parsedTextWriter = new StringWriter();
101 Iterable<Part> parts = soneTextParser.parse(text, context);
103 int allPartsLength = 0;
104 List<Part> shortenedParts = new ArrayList<Part>();
105 for (Part part : parts) {
106 if (part instanceof PlainTextPart) {
107 String longText = part.getText();
108 if (allPartsLength < cutOffLength) {
109 if ((allPartsLength + longText.length()) > cutOffLength) {
110 shortenedParts.add(new PlainTextPart(longText.substring(0, cutOffLength - allPartsLength) + "…"));
112 shortenedParts.add(part);
115 allPartsLength += longText.length();
116 } else if (part instanceof LinkPart) {
117 if (allPartsLength < cutOffLength) {
118 shortenedParts.add(part);
120 allPartsLength += part.getText().length();
122 if (allPartsLength < cutOffLength) {
123 shortenedParts.add(part);
127 if (allPartsLength >= length) {
128 parts = shortenedParts;
131 render(parsedTextWriter, parts);
132 return parsedTextWriter.toString();
140 * Renders the given parts.
143 * The writer to render the parts to
145 * The parts to render
147 private void render(Writer writer, Iterable<Part> parts) {
148 for (Part part : parts) {
149 render(writer, part);
154 * Renders the given part.
157 * The writer to render the part to
161 @SuppressWarnings("unchecked")
162 private void render(Writer writer, Part part) {
163 if (part instanceof PlainTextPart) {
164 render(writer, (PlainTextPart) part);
165 } else if (part instanceof FreenetLinkPart) {
166 render(writer, (FreenetLinkPart) part);
167 } else if (part instanceof LinkPart) {
168 render(writer, (LinkPart) part);
169 } else if (part instanceof SonePart) {
170 render(writer, (SonePart) part);
171 } else if (part instanceof PostPart) {
172 render(writer, (PostPart) part);
173 } else if (part instanceof Iterable<?>) {
174 render(writer, (Iterable<Part>) part);
179 * Renders the given plain-text part.
182 * The writer to render the part to
183 * @param plainTextPart
186 private void render(Writer writer, PlainTextPart plainTextPart) {
187 TemplateContext templateContext = templateContextFactory.createTemplateContext();
188 templateContext.set("text", plainTextPart.getText());
189 plainTextTemplate.render(templateContext, writer);
193 * Renders the given freenet link part.
196 * The writer to render the part to
197 * @param freenetLinkPart
200 private void render(Writer writer, FreenetLinkPart freenetLinkPart) {
201 renderLink(writer, "/" + freenetLinkPart.getLink(), freenetLinkPart.getText(), freenetLinkPart.getTitle(), freenetLinkPart.isTrusted() ? "freenet-trusted" : "freenet");
205 * Renders the given link part.
208 * The writer to render the part to
212 private void render(Writer writer, LinkPart linkPart) {
214 renderLink(writer, "/external-link/?_CHECKED_HTTP_=" + URLEncoder.encode(linkPart.getLink(), "UTF-8"), linkPart.getText(), linkPart.getTitle(), "internet");
215 } catch (UnsupportedEncodingException uee1) {
216 /* not possible for UTF-8. */
217 throw new RuntimeException("The JVM does not support UTF-8 encoding!", uee1);
222 * Renders the given Sone part.
225 * The writer to render the part to
229 private void render(Writer writer, SonePart sonePart) {
230 if ((sonePart.getSone() != null) && (sonePart.getSone().getName() != null)) {
231 renderLink(writer, "viewSone.html?sone=" + sonePart.getSone().getId(), SoneAccessor.getNiceName(sonePart.getSone()), SoneAccessor.getNiceName(sonePart.getSone()), "in-sone");
233 renderLink(writer, "/WebOfTrust/ShowIdentity?id=" + sonePart.getSone().getId(), sonePart.getSone().getId(), sonePart.getSone().getId(), "in-sone");
238 * Renders the given post part.
241 * The writer to render the part to
245 private void render(Writer writer, PostPart postPart) {
246 SoneTextParser parser = new SoneTextParser(core, core);
247 SoneTextParserContext parserContext = new SoneTextParserContext(postPart.getPost().getSone());
248 Iterable<Part> parts = parser.parse(postPart.getPost().getText(), parserContext);
249 StringBuilder excerpt = new StringBuilder();
250 for (Part part : parts) {
251 excerpt.append(part.getText());
252 if (excerpt.length() > 20) {
253 int lastSpace = excerpt.lastIndexOf(" ", 20);
254 if (lastSpace > -1) {
255 excerpt.setLength(lastSpace);
257 excerpt.setLength(20);
263 renderLink(writer, "viewPost.html?post=" + postPart.getPost().getId(), excerpt.toString(), SoneAccessor.getNiceName(postPart.getPost().getSone()), "in-sone");
267 * Renders the given link.
270 * The writer to render the link to
274 * The text of the link
276 * The title of the link
278 * The CSS class of the link
280 private void renderLink(Writer writer, String link, String text, String title, String cssClass) {
281 TemplateContext templateContext = templateContextFactory.createTemplateContext();
282 templateContext.set("cssClass", cssClass);
283 templateContext.set("link", link);
284 templateContext.set("text", text);
285 templateContext.set("title", title);
286 linkTemplate.render(templateContext, writer);