src/Tools/jEdit/src/renderer/UserAgent.scala

+/*
+ * XML/CSS rendering -- user agent
+ *
+ * @author Fabian Immler, TU Munich
+ * @author Johannes Hölzl, TU Munich
+ */
+
+package isabelle.renderer
+
+
+import java.io.ByteArrayInputStream
+import org.xhtmlrenderer.swing.NaiveUserAgent
+import org.xhtmlrenderer.resource.CSSResource
+import isabelle.IsabelleSystem.getenv
+
+
+object UserAgent {
+  // FIXME avoid static getenv
+  val baseURL = "file://localhost" + getenv("ISABELLE_HOME") + "/lib/html/"
+  val userStylesheet =  "file://localhost" + getenv("ISABELLE_HOME_USER") + "/etc/user.css"
+  val stylesheet = """
+
+@import "isabelle.css";
+
+@import '""" + userStylesheet + """';
+
+messages, message {
+  display: block;
+  white-space: pre-wrap;
+  font-family: Isabelle;
+}
+""" 
+}
+
+class UserAgent extends NaiveUserAgent {
+  override def getCSSResource(uri : String) : CSSResource = {
+    if (uri == UserAgent.baseURL + "style")
+      new CSSResource(
+        new ByteArrayInputStream(UserAgent.stylesheet.getBytes()))
+    else {
+      val stream = resolveAndOpenStream(uri)
+      val resource = new CSSResource(stream)
+      if (stream == null)
+        resource.getResourceInputSource().setByteStream(
+          new ByteArrayInputStream(new Array[Byte](0)))
+      resource
+    }
+  }
+}