<?xml version="1.0"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<!-- Written by Ricardo Rocha <rrocha@plenix.org> -->
<!-- Fixed for version 2.0 by Davanum Srinivas <dims@yahoo.com> -->

<xsp:page language="java" xmlns:xsp="http://apache.org/xsp">

  <xsp:structure>
    <xsp:include>org.w3c.dom.*</xsp:include>
    <xsp:include>org.apache.cocoon.components.source.SourceUtil</xsp:include>
    <xsp:include>org.apache.cocoon.xml.dom.DOMStreamer</xsp:include>
    <xsp:include>org.apache.excalibur.xml.dom.DOMParser</xsp:include>
    <xsp:include>org.apache.excalibur.source.Source</xsp:include>
  </xsp:structure>

  <xsp:logic><![CDATA[
    private static final String ATTR_NAME_COLOR = "darkblue";
    private static final String ATTR_VALUE_COLOR = "navy";
    private static final String COMMENT_COLOR = "gray";
    private static final String DELIMITER_COLOR = "blue";
    private static final String ELEMENT_COLOR = "navy";
    private static final String ENTITY_REF_COLOR = "navy";
    private static final String PI_COLOR = "darkred";
    private static final String TEXT_COLOR = "black";
    private static final String CUSTOM_ELEMENT_COLOR = "green";
    private static final String XSL_ELEMENT_COLOR = "purple";
    private static final String XSP_ELEMENT_COLOR = "green";
    private static final String XSP_TEXT_COLOR = "red";

    protected void colorize(Node node, Document factory) throws SAXException {
      Element element = factory.createElement("pre");
      DocumentFragment fragment = factory.createDocumentFragment();
      element.appendChild(doColorize(node, factory, 0, TEXT_COLOR));
      DOMStreamer ds = new DOMStreamer (this.contentHandler);
      ds.stream (element);
    }

    protected static DocumentFragment
      doColorize(Node node, Document factory, int level, String textColor)
    {
      Element result = null;
      DocumentFragment fragment = factory.createDocumentFragment();

      switch (node.getNodeType()) {
        case Node.CDATA_SECTION_NODE:
          result = factory.createElement("font");
          result.setAttribute("color", DELIMITER_COLOR);
          result.appendChild(factory.createTextNode("<![CDATA["));
          fragment.appendChild(result);

          result = factory.createElement("font");
          result.setAttribute("color", textColor);
          result.appendChild(factory.createTextNode(node.getNodeValue()));
          fragment.appendChild(result);

          result = factory.createElement("font");
          result.setAttribute("color", DELIMITER_COLOR);
          // I know the thing below is ugly, but man, nested CDATA are a pain in the ass!
          result.appendChild(factory.createTextNode("]]]]>&gt;<![CDATA["));
          fragment.appendChild(result);

          break;
        case Node.ELEMENT_NODE: {
          Element element = (Element) node;

          result = factory.createElement("font");
          result.setAttribute("color", DELIMITER_COLOR);
          result.appendChild(factory.createTextNode("<"));
          fragment.appendChild(result);

          String tagColor = ELEMENT_COLOR;
          String tagName = element.getTagName();

          if (tagName.startsWith("xsp:")) {
            tagColor = XSP_ELEMENT_COLOR;
          } else if (tagName.startsWith("xsl:")) {
            tagColor = XSL_ELEMENT_COLOR;
          } else if (tagName.indexOf(':') >= 0) {
            tagColor = CUSTOM_ELEMENT_COLOR;
          }

          result = factory.createElement("font");
          result.setAttribute("color", tagColor);
          result.appendChild(factory.createTextNode(tagName));
          fragment.appendChild(result);

          NamedNodeMap attributes = element.getAttributes();
          int attributeCount = attributes.getLength();

          for (int i = 0; i < attributeCount; i++) {
            Attr attribute = (Attr) attributes.item(i);

            result = factory.createElement("font");
            result.setAttribute("color", ATTR_NAME_COLOR);
            result.appendChild(
              factory.createTextNode(" " + attribute.getName() + "=")
            );
            fragment.appendChild(result);

            result = factory.createElement("font");
            result.setAttribute("color", ATTR_VALUE_COLOR);
            result.appendChild(
              factory.createTextNode("\"" + attribute.getValue() + "\"")
            );
            fragment.appendChild(result);
          }

          NodeList nodeList = element.getChildNodes();
          int childCount = nodeList.getLength();

          result = factory.createElement("font");
          result.setAttribute("color", DELIMITER_COLOR);
          result.appendChild(
            factory.createTextNode((childCount == 0 ? "/" : "") + ">")
          );
          fragment.appendChild(result);

          if (tagName.startsWith("xsp:")) {
            textColor = XSP_TEXT_COLOR;
          } else {
            textColor = TEXT_COLOR;
          }

          result = factory.createElement("font");
          result.setAttribute("color", textColor);

          for (int i = 0; i < childCount; i++) {
            result.appendChild(
              doColorize(nodeList.item(i), factory, level + 1, textColor)
            );
          }
          fragment.appendChild(result);

          if (childCount > 0) {
            result = factory.createElement("font");
            result.setAttribute("color", DELIMITER_COLOR);
            result.appendChild(factory.createTextNode("</"));
            fragment.appendChild(result);

            result = factory.createElement("font");
            result.setAttribute("color", tagColor);
            result.appendChild(factory.createTextNode(tagName));
            fragment.appendChild(result);

            result = factory.createElement("font");
            result.setAttribute("color", DELIMITER_COLOR);
            result.appendChild(factory.createTextNode(">"));
            fragment.appendChild(result);
          }

          break;
        }
        case Node.DOCUMENT_NODE:
        case Node.DOCUMENT_FRAGMENT_NODE: {
          NodeList nodeList = node.getChildNodes();
          int childCount = nodeList.getLength();

          for (int i = 0; i < childCount; i++) {
            fragment.appendChild(
              doColorize(nodeList.item(i), factory, level + 1, textColor)
            );
          }

          break;
        }
        case Node.COMMENT_NODE:
          result = factory.createElement("font");
          result.setAttribute("color", COMMENT_COLOR);

          result.appendChild(
            factory.createTextNode(
              "<!-- " + node.getNodeValue() + " -->"
            )
          );

          fragment.appendChild(result);

          break;
        case Node.PROCESSING_INSTRUCTION_NODE:
          ProcessingInstruction pi = (ProcessingInstruction) node;

          result = factory.createElement("font");
          result.setAttribute("color", DELIMITER_COLOR);
          result.appendChild(factory.createTextNode("<?"));
          fragment.appendChild(result);

          result = factory.createElement("font");
          result.setAttribute("color", PI_COLOR);
          result.appendChild(factory.createTextNode(pi.getTarget() + " " + pi.getData()));
          fragment.appendChild(result);

          result = factory.createElement("font");
          result.setAttribute("color", DELIMITER_COLOR);
          result.appendChild(factory.createTextNode("?>\n"));
          fragment.appendChild(result);

          break;
        case Node.ENTITY_REFERENCE_NODE:
          result = factory.createElement("font");
          result.setAttribute("color", ENTITY_REF_COLOR);
          result.appendChild(
            factory.createTextNode("<" + node.getNodeValue() + ";")
          );
          fragment.appendChild(result);

          break;
        case Node.TEXT_NODE:
          fragment.appendChild(factory.createTextNode(node.getNodeValue()));
          break;
        default:
          break;
      }

      return fragment;
    }
  ]]></xsp:logic>

  <html>
    <head>
      <title>Source Code</title>
      <link rel="stylesheet" type="text/css" href="style" title="Style"/>
    </head>

    <body>
      <xsp:logic>
        String filename = request.getParameter("filename");
        if (filename != null) {

          <h3 style="color:navy; text-align: center">
            <xsp:expr>filename</xsp:expr>
          </h3>
        
          DOMParser parser = null;
          Source source = null;

          try {
              parser = (DOMParser)manager.lookup(DOMParser.ROLE);
              Document outputDocument = parser.createDocument();

              source = super.resolver.resolveURI("context://" + filename);

              Document sourceDocument = parser.parseDocument(SourceUtil.getInputSource(source));

              this.colorize(sourceDocument, outputDocument);    
          } catch (SAXException e){
              getLogger().debug("SAXException in colorize", e);
              throw e;
          } catch (org.w3c.dom.DOMException e){
              getLogger().debug("DOMException in colorize", e);
              throw e;
          } catch (Exception e) {
              getLogger().error("Could not include page", e);
              <p style="color: red; font-weight: bold;">
                Could not include page:
                <xsp:expr>e</xsp:expr>
              </p>
          } finally {
              this.manager.release((Component) parser);
              if (source != null) {
                  super.resolver.release(source);
                  source = null;
              }
          }
        } else {
          <h3 style="color:navy; text-align: center">
            Need <em>filename</em> or <em>url</em> parameters to work
          </h3>
        }
      </xsp:logic>
    </body>
  </html>
</xsp:page>