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();
109 private void render(Writer writer, Iterable<Part> parts) throws IOException {
110 for (Part part : parts) {
111 render(writer, part);
115 private void render(Writer writer, Part part) throws IOException {
116 if (part instanceof PlainTextPart) {
117 render(writer, (PlainTextPart) part);
118 } else if (part instanceof FreenetLinkPart) {
119 render(writer, (FreenetLinkPart) part);
120 } else if (part instanceof LinkPart) {
121 render(writer, (LinkPart) part);
122 } else if (part instanceof SonePart) {
123 render(writer, (SonePart) part);
124 } else if (part instanceof PostPart) {
125 render(writer, (PostPart) part);
126 } else if (part instanceof Iterable<?>) {
127 render(writer, (Iterable<Part>) part);
131 private void render(Writer writer, PlainTextPart plainTextPart) throws IOException {
132 TemplateContext templateContext = templateContextFactory.createTemplateContext();
133 templateContext.set("text", plainTextPart.getText());
134 plainTextTemplate.render(templateContext, writer);
137 private void render(Writer writer, FreenetLinkPart freenetLinkPart) throws IOException {
138 renderLink(writer, "/" + freenetLinkPart.getLink(), freenetLinkPart.getText(), freenetLinkPart.getTitle(), freenetLinkPart.isTrusted() ? "freenet-trusted" : "freenet");
141 private void render(Writer writer, LinkPart linkPart) throws IOException {
142 renderLink(writer, "/?_CHECKED_HTTP_=" + linkPart.getLink(), linkPart.getText(), linkPart.getTitle(), "internet");
145 private void render(Writer writer, SonePart sonePart) throws IOException {
146 renderLink(writer, "viewSone.html?sone=" + sonePart.getSone().getId(), SoneAccessor.getNiceName(sonePart.getSone()), SoneAccessor.getNiceName(sonePart.getSone()), "in-sone");
149 private void render(Writer writer, PostPart postPart) throws IOException {
150 renderLink(writer, "viewPost.html?post=" + postPart.getPost().getId(), getExcerpt(postPart.getPost().getText(), 20), SoneAccessor.getNiceName(postPart.getPost().getSone()), "in-sone");
153 private void renderLink(Writer writer, String link, String text, String title, String cssClass) {
154 TemplateContext templateContext = templateContextFactory.createTemplateContext();
155 templateContext.set("cssClass", cssClass);
156 templateContext.set("link", link);
157 templateContext.set("text", text);
158 templateContext.set("title", title);
159 linkTemplate.render(templateContext, writer);
166 private static String getExcerpt(String text, int length) {
167 if (text.length() > length) {
168 return text.substring(0, length) + "…";