rebuilding head

[mir.git] / source / mir / generator / tal / TALTemplateEngine.java

diff --git a/source/mir/generator/tal/TALTemplateEngine.java b/source/mir/generator/tal/TALTemplateEngine.java
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+/*
+ * Copyright (C) 2001, 2002 The Mir-coders group
+ *
+ * This file is part of Mir.
+ *
+ * Mir 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Mir 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 Mir; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * In addition, as a special exception, The Mir-coders gives permission to link
+ * the code of this program with  any library licensed under the Apache Software License,
+ * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
+ * (or with modified versions of the above that use the same license as the above),
+ * and distribute linked combinations including the two.  You must obey the
+ * GNU General Public License in all respects for all of the code used other than
+ * the above mentioned libraries.  If you modify this file, you may extend this
+ * exception to your version of the file, but you are not obligated to do so.
+ * If you do not wish to do so, delete this exception statement from your version.
+ */
+
+package mir.generator.tal;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Map;
+import java.util.List;
+
+import mir.generator.tal.interfaces.TALExpressionParser;
+import mir.generator.tal.template.*;
+import mir.util.StringRoutines;
+
+public class TALTemplateEngine implements TemplateLibrary {
+  private TALExpressionParser expressionParser;
+  private File basePath;
+  private CachingFileLoader loader;
+
+  private SimpleTemplateNodeLibraryRegistry registry;
+
+  public TALTemplateEngine(TALExpressionParser anExpressionParser, File aBasePath) {
+    expressionParser = anExpressionParser;
+    basePath = aBasePath;
+    loader = new CachingFileLoader(100, new TemplateFactory());
+
+    registry = new SimpleTemplateNodeLibraryRegistry();
+
+    registerTemplateNodeLibrary("tal", "http://xml.zope.org/namespaces/tal",
+        new CoreTemplateNodeLibrary("tal", "http://xml.zope.org/namespaces/tal"));
+    registerTemplateNodeLibrary("metal", "http://xml.zope.org/namespaces/metal",
+        new MacroTemplateNodeLibrary("metal", "http://xml.zope.org/namespaces/metal"));
+  }
+
+  public void registerTemplateNodeLibrary(String aPrefix, String aUrl, TemplateNodeLibrary aLibrary) {
+    registry.registerTemplateNodeLibrary(aPrefix, aUrl, aLibrary);
+  }
+
+  public Template loadTemplate(String aName) throws IOException, TemplateProcessingException {
+    List parts = StringRoutines.splitString(aName, "#");
+
+    if (parts.size()!=1 && parts.size()!=2) {
+      throw new TemplateProcessingException("Invalid template name: " + aName);
+    }
+
+    File location = new File(basePath, (String) parts.get(0));
+
+    Template baseTemplate = (Template) loader.retrieveFile(location.getCanonicalPath());
+
+    if (baseTemplate!=null && parts.size()>1) {
+      Map definitions = (Map) baseTemplate.getContext().get(MacroTemplateNodeLibrary.MACRO_DEFINITIONS_KEY);
+      if (definitions==null || !definitions.containsKey(parts.get(1))) {
+        throw new TemplateProcessingException("No macro '"+(String) parts.get(1)+"' found in template '" + (String) parts.get(0) + "'");
+      }
+
+      return new Template(expressionParser, (TemplateNode) definitions.get(parts.get(1)), baseTemplate.getContext());
+    }
+    else {
+      return baseTemplate;
+    }
+
+
+
+//      public Template(TALExpressionParser aParser, TemplateNode aRootNode, Map aTemplateContext) {
+  }
+
+  public Template lookupTemplate(String aName) throws TemplateProcessingException {
+    try {
+      return loadTemplate(aName);
+    }
+    catch (IOException e) {
+      throw new TemplateProcessingException("Can't load template " + aName + ": " + e.toString(), e);
+    }
+  }
+
+  private class TemplateFactory implements CachingFileLoader.CachedFileObjectFactory {
+    public Object constructObject(InputStream aStream) {
+      try {
+        TALTemplateParser parser = new TALTemplateParser(registry);
+
+        return parser.parse(aStream, expressionParser);
+      }
+      catch (Throwable t) {
+        throw new TALFailure(t);
+      }
+    }
+  }
+}
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