From 4cf05708370df28a1598b55b2f18573ca8afb532 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Fri, 14 Jan 2011 14:46:03 +0100
Subject: [PATCH] Add Javascript string filter.

---
 .../sone/template/JavascriptFilter.java            | 68 ++++++++++++++++++++++
 .../net/pterodactylus/sone/web/WebInterface.java   |  2 +
 2 files changed, 70 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/sone/template/JavascriptFilter.java

diff --git a/src/main/java/net/pterodactylus/sone/template/JavascriptFilter.java b/src/main/java/net/pterodactylus/sone/template/JavascriptFilter.java
new file mode 100644
index 0000000..0cd55de
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/template/JavascriptFilter.java
@@ -0,0 +1,68 @@
+/*
+ * Sone - JavascriptFilter.java - Copyright © 2011 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
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.template;
+
+import java.util.Map;
+
+import net.pterodactylus.util.number.Hex;
+import net.pterodactylus.util.template.DataProvider;
+import net.pterodactylus.util.template.Filter;
+
+/**
+ * Escapes double quotes, backslashes, carriage returns and line feeds, and
+ * additionally encloses a given string with double quotes to make it possible
+ * to use a string in Javascript.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class JavascriptFilter implements Filter {
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public Object format(DataProvider dataProvider, Object data, Map<String, String> parameters) {
+		StringBuilder javascriptString = new StringBuilder();
+		javascriptString.append('"');
+		for (char c : String.valueOf(data).toCharArray()) {
+			if (c == '\r') {
+				javascriptString.append("\\r");
+				continue;
+			}
+			if (c == '\n') {
+				javascriptString.append("\\n");
+				continue;
+			}
+			if (c == '\t') {
+				javascriptString.append("\\t");
+				continue;
+			}
+			if ((c == '"') || (c == '\\')) {
+				javascriptString.append('\\');
+				javascriptString.append(c);
+			} else if (c < 32) {
+				javascriptString.append("\\x").append(Hex.toHex((byte) c));
+			} else {
+				javascriptString.append(c);
+			}
+		}
+		javascriptString.append('"');
+		return javascriptString.toString();
+	}
+
+}
diff --git a/src/main/java/net/pterodactylus/sone/web/WebInterface.java b/src/main/java/net/pterodactylus/sone/web/WebInterface.java
index 92809b2..b30de6c 100644
--- a/src/main/java/net/pterodactylus/sone/web/WebInterface.java
+++ b/src/main/java/net/pterodactylus/sone/web/WebInterface.java
@@ -46,6 +46,7 @@ import net.pterodactylus.sone.template.CollectionAccessor;
 import net.pterodactylus.sone.template.CssClassNameFilter;
 import net.pterodactylus.sone.template.GetPagePlugin;
 import net.pterodactylus.sone.template.IdentityAccessor;
+import net.pterodactylus.sone.template.JavascriptFilter;
 import net.pterodactylus.sone.template.NotificationManagerAccessor;
 import net.pterodactylus.sone.template.PostAccessor;
 import net.pterodactylus.sone.template.ReplyAccessor;
@@ -170,6 +171,7 @@ public class WebInterface implements CoreListener {
 		templateFactory.addFilter("change", new RequestChangeFilter());
 		templateFactory.addFilter("match", new MatchFilter());
 		templateFactory.addFilter("css", new CssClassNameFilter());
+		templateFactory.addFilter("js", new JavascriptFilter());
 		templateFactory.addPlugin("getpage", new GetPagePlugin());
 		templateFactory.addPlugin("paginate", new PaginationPlugin());
 		templateFactory.setTemplateProvider(new ClassPathTemplateProvider(templateFactory));
-- 
2.7.4