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package org.madore.damlengine;
import java.io.Writer;
import java.io.IOException;
import org.w3c.dom.*;
public final class Unparser {
private Document doc;
private Node cursor;
private enum Dir { PUSHING, POPPING };
private Dir dir;
private Writer out;
public Unparser(Document doc, Writer out) {
this.doc = doc;
this.out = out;
}
protected void enter() {
Node chld = cursor.getFirstChild();
if ( chld == null ) {
dir = Dir.POPPING;
} else {
cursor = chld;
dir = Dir.PUSHING;
}
}
protected void skip() {
Node nsib = cursor.getNextSibling();
if ( nsib == null ) {
cursor = cursor.getParentNode();
dir = Dir.POPPING;
} else {
cursor = nsib;
dir = Dir.PUSHING;
}
}
public static String quote(String s) {
StringBuilder buf = new StringBuilder(s.length()+64);
int ptr0 = 0; int ptr;
for ( ptr=0 ; ptr<s.length() ; ptr++ ) {
char ch = s.charAt(ptr);
String qch = null;
switch ( ch ) {
case '&': qch = "&"; break;
case '<': qch = "<"; break;
case '>': qch = ">"; break;
case '"': qch = """; break;
}
if ( qch != null ) {
buf.append(s, ptr0, ptr);
buf.append(qch);
}
}
buf.append(s, ptr0, ptr);
return buf.toString();
}
protected void unparseOne()
throws IOException {
// System.err.println("unparseOne(): cursor.nodeName="+cursor.getNodeName());
switch ( dir ) {
case PUSHING:
if ( cursor.getNodeType() == Node.ELEMENT_NODE ) {
Element elt = (Element)cursor;
String qname = elt.getTagName();
out.write("<"+qname);
if ( elt.hasAttributes() ) {
NamedNodeMap attrs = elt.getAttributes();
Node n2;
for ( int i=0 ; (n2=attrs.item(i)) != null ; i++ ) {
Attr attr = (Attr)n2;
out.write(" "+attr.getName()+"=\""+quote(attr.getValue())+"\"");
}
}
if ( ! elt.hasChildNodes() && ( qname.equals("br") || qname.equals("hr")
|| qname.equals("img")
|| qname.equals("area")
|| qname.equals("base")
|| qname.equals("basefont")
|| qname.equals("col")
|| qname.equals("frame")
|| qname.equals("input")
|| qname.equals("isindex")
|| qname.equals("link")
|| qname.equals("meta")
|| qname.equals("param") ) ) {
out.write(" />");
skip();
} else {
out.write(">");
enter();
}
} else if ( cursor.getNodeType() == Node.DOCUMENT_NODE ) {
enter();
} else if ( cursor.getNodeType() == Node.TEXT_NODE ) {
out.write(quote(((Text)cursor).getData()));
skip();
} else if ( cursor.getNodeType() == Node.COMMENT_NODE ) {
// FIXME: comments could conceivably contain the "--" string
out.write("<!--"+((Comment)cursor).getData()+"-->");
skip();
} else if ( cursor.getNodeType() == Node.CDATA_SECTION_NODE ) {
// FIXME: cdata section could conceivably contain the "]]>" string
out.write("<![CDATA["+((CDATASection)cursor).getData()+"]]>");
skip();
} else {
skip();
}
break;
case POPPING:
if ( cursor.getNodeType() == Node.ELEMENT_NODE ) {
Element elt = (Element)cursor;
out.write("</"+elt.getTagName()+">");
}
skip();
break;
}
}
public void unparse()
throws IOException {
out.write("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
DocumentType doctype = doc.getDoctype();
if ( doctype != null ) {
String externalId = "";
if ( doctype.getPublicId() != null ) {
externalId = " PUBLIC \""+doctype.getPublicId()+"\" \""
+doctype.getSystemId()+"\"";
} else if ( doctype.getSystemId() != null ) {
externalId = " SYSTEM \""+doctype.getSystemId()+"\"";
}
out.write("<!DOCTYPE "+doctype.getName()+externalId+">\n");
}
cursor = doc.getDocumentElement();
dir = Dir.PUSHING;
while ( cursor != null ) {
unparseOne();
}
out.write("\n");
out.flush();
}
}
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