2 * Sone - ParserFilter.java - Copyright © 2011 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 java.io.IOException;
21 import java.io.StringReader;
22 import java.io.StringWriter;
23 import java.io.Writer;
26 import net.pterodactylus.sone.core.Core;
27 import net.pterodactylus.sone.data.Sone;
28 import net.pterodactylus.sone.text.FreenetLinkPart;
29 import net.pterodactylus.sone.text.LinkPart;
30 import net.pterodactylus.sone.text.Part;
31 import net.pterodactylus.sone.text.PlainTextPart;
32 import net.pterodactylus.sone.text.PostPart;
33 import net.pterodactylus.sone.text.SonePart;
34 import net.pterodactylus.sone.text.SoneTextParser;
35 import net.pterodactylus.sone.text.SoneTextParserContext;
36 import net.pterodactylus.sone.web.page.Page.Request;
37 import net.pterodactylus.util.template.Filter;
38 import net.pterodactylus.util.template.Template;
39 import net.pterodactylus.util.template.TemplateContext;
40 import net.pterodactylus.util.template.TemplateContextFactory;
41 import net.pterodactylus.util.template.TemplateParser;
44 * Filter that filters a given text through a {@link SoneTextParser}.
46 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
48 public class ParserFilter implements Filter {
51 private final Core core;
53 /** The link parser. */
54 private final SoneTextParser textParser;
56 /** The template context factory. */
57 private final TemplateContextFactory templateContextFactory;
59 /** The template for {@link PlainTextPart}s. */
60 private final Template plainTextTemplate = TemplateParser.parse(new StringReader("<%text|html>"));
62 /** The template for {@link FreenetLinkPart}s. */
63 private final Template linkTemplate = TemplateParser.parse(new StringReader("<a class=\"<%cssClass|html>\" href=\"<%link|html>\" title=\"<%title|html>\"><%text|html></a>"));
66 * Creates a new filter that runs its input through a {@link SoneTextParser}
71 * @param templateContextFactory
72 * The context factory for rendering the parts
74 public ParserFilter(Core core, TemplateContextFactory templateContextFactory) {
76 this.templateContextFactory = templateContextFactory;
77 textParser = new SoneTextParser(core);
84 public Object format(TemplateContext templateContext, Object data, Map<String, String> parameters) {
85 String text = String.valueOf(data);
86 String soneKey = parameters.get("sone");
87 if (soneKey == null) {
90 Sone sone = (Sone) templateContext.get(soneKey);
92 sone = core.getSone(soneKey, false);
94 Request request = (Request) templateContext.get("request");
95 SoneTextParserContext context = new SoneTextParserContext(request, sone);
96 StringWriter parsedTextWriter = new StringWriter();
98 render(parsedTextWriter, textParser.parse(context, new StringReader(text)));
99 } catch (IOException ioe1) {
100 /* no exceptions in a StringReader or StringWriter, ignore. */
102 return parsedTextWriter.toString();
110 * Renders the given parts.
113 * The writer to render the parts to
115 * The parts to render
117 private void render(Writer writer, Iterable<Part> parts) {
118 for (Part part : parts) {
119 render(writer, part);
124 * Renders the given part.
127 * The writer to render the part to
131 @SuppressWarnings("unchecked")
132 private void render(Writer writer, Part part) {
133 if (part instanceof PlainTextPart) {
134 render(writer, (PlainTextPart) part);
135 } else if (part instanceof FreenetLinkPart) {
136 render(writer, (FreenetLinkPart) part);
137 } else if (part instanceof LinkPart) {
138 render(writer, (LinkPart) part);
139 } else if (part instanceof SonePart) {
140 render(writer, (SonePart) part);
141 } else if (part instanceof PostPart) {
142 render(writer, (PostPart) part);
143 } else if (part instanceof Iterable<?>) {
144 render(writer, (Iterable<Part>) part);
149 * Renders the given plain-text part.
152 * The writer to render the part to
153 * @param plainTextPart
156 private void render(Writer writer, PlainTextPart plainTextPart) {
157 TemplateContext templateContext = templateContextFactory.createTemplateContext();
158 templateContext.set("text", plainTextPart.getText());
159 plainTextTemplate.render(templateContext, writer);
163 * Renders the given freenet link part.
166 * The writer to render the part to
167 * @param freenetLinkPart
170 private void render(Writer writer, FreenetLinkPart freenetLinkPart) {
171 renderLink(writer, "/" + freenetLinkPart.getLink(), freenetLinkPart.getText(), freenetLinkPart.getTitle(), freenetLinkPart.isTrusted() ? "freenet-trusted" : "freenet");
175 * Renders the given link part.
178 * The writer to render the part to
182 private void render(Writer writer, LinkPart linkPart) {
183 renderLink(writer, "/?_CHECKED_HTTP_=" + linkPart.getLink(), linkPart.getText(), linkPart.getTitle(), "internet");
187 * Renders the given Sone part.
190 * The writer to render the part to
194 private void render(Writer writer, SonePart sonePart) {
195 renderLink(writer, "viewSone.html?sone=" + sonePart.getSone().getId(), SoneAccessor.getNiceName(sonePart.getSone()), SoneAccessor.getNiceName(sonePart.getSone()), "in-sone");
199 * Renders the given post part.
202 * The writer to render the part to
206 private void render(Writer writer, PostPart postPart) {
207 renderLink(writer, "viewPost.html?post=" + postPart.getPost().getId(), getExcerpt(postPart.getPost().getText(), 20), SoneAccessor.getNiceName(postPart.getPost().getSone()), "in-sone");
211 * Renders the given link.
214 * The writer to render the link to
218 * The text of the link
220 * The title of the link
222 * The CSS class of the link
224 private void renderLink(Writer writer, String link, String text, String title, String cssClass) {
225 TemplateContext templateContext = templateContextFactory.createTemplateContext();
226 templateContext.set("cssClass", cssClass);
227 templateContext.set("link", link);
228 templateContext.set("text", text);
229 templateContext.set("title", title);
230 linkTemplate.render(templateContext, writer);
238 * Returns up to {@code length} characters from the given text, appending
239 * “…” if the text is longer.
242 * The text to get an excerpt from
244 * The maximum length of the excerpt (without the ellipsis)
245 * @return The excerpt of the text
247 private static String getExcerpt(String text, int length) {
248 if (text.length() > length) {
249 return text.substring(0, length) + "…";