import java.io.*;
import org.w3c.dom.*;
import com.sun.xml.tree.*;
/**
* Class with code to walk a tree and convert it to MML (not MIF).
* WAY OUT OF DATE W.R.T. THE "DTD" -- DO NOT USE!!
* @author Ian F. Darwin, ian@darwinsys.com
* @version $Id: GenMML.java,v 1.9 2000/04/18 17:56:32 ian Exp $
*/
public class GenMML implements XmlFormWalker {
/** The normal output writer */
PrintWriter msg;
/** Specialized PrintWriter for use by GetMark. */
StyledWriter smsg;
/** A tree walker object for walking the tree */
TreeWalker tw;
/** A GetMark converter for source code. */
GetMark gm = new GetMark();
/** Construct a converter object */
GenMML(Document doc, PrintWriter pw) {
tw = new TreeWalker(doc);
msg = new PrintWriter(pw);
smsg = new StyledPrintStream(msg);
}
/** Convert all the nodes in the current document. */
public void convertAll() {
msg.println("<MML 1.00 -- MML produced by XmlForm>");
msg.println("<Include \"xmlformat.mml\">");
for (Node p = tw.getCurrent(); p != null; p = tw.getNext())
doNode(p);
}
public void doNode(Node p) {
if (p instanceof com.sun.xml.tree.XmlDocument)
return; // nothing to do - structural object.
// else if (p instanceof com.sun.xml.tree.Doctype)
// return; // ditto
else if (p instanceof Element)
doElement((Element)p);
else if (p instanceof org.w3c.dom.CharacterData)
doCData((org.w3c.dom.CharacterData)p);
else
System.err.println("IGNORING non-Element: " +
p.getClass() + : + p.toString() + "\n" +
p.getNodeValue());
}
protected void doElement(Element p) {
String tag = p.getTagName().toLowerCase();
if (tag.equals("ch")) {
doChapter(p);
} else if (tag.equals("sc")) {
doSection(p);
} else if (tag.equals("ss")) {
doSubSection(p);
} else if (tag.equals("p")) {
doParagraph(p);
} else if (tag.equals("pr")) {
msg.println("<HeadB>Problem");
} else if (tag.equals("so")) {
msg.println("<HeadB>Solution");
} else if (tag.equals("di")) {
msg.println("<HeadB>Discussion");
} else if (tag.equals("code")) {
doCode(p);
} else if (tag.equals("b")) {
doBold(p);
} else if (tag.equals("i")) {
doItalic(p);
} else if (tag.equals("example")) {
doExample(p);
} else
System.err.println("IGNORING UNHANDLED TAG " + tag + ( +
p.getClass() + @ + p.hashCode() + ));
}
protected void doChapter(Element p) {
msg.println("<ChapterTitle>");
}
protected void doSection(Element p) {
msg.println("<HeadA>");
}
protected void doSubSection(Element p) {
msg.println("<HeadB>");
}
protected void doParagraph(Element p) {
msg.println("<Body>");
}
protected void doExample(Element p) {
NamedNodeMap attrs = p.getAttributes();
Node href;
if ((href = attrs.getNamedItem("HREF")) == null)
throw new IllegalArgumentException(
"node " + p + "lacks required HREF Attribute");
String fname = href.getNodeValue();
msg.println("<Example>");
try {
fname = "/javasrc/" + fname;
LineNumberReader is = new LineNumberReader(new FileReader(fname));
gm.process(fname, is, smsg);
} catch(IOException e) {
throw new IllegalArgumentException(e.toString());
}
}
protected void doCData(org.w3c.dom.CharacterData p) {
String s = p.getData().trim();
if (s.length() == 0) // Suns parser returns extra 1-space "Text"s
return;
msg.println(s);
}
protected void doBold(Element p) {
msg.print("<Bold>");
doNodes(p);
msg.print("<Plain>");
}
protected void doItalic(Element p) {
msg.print("<Italic>");
doNodes(p);
msg.print("<Plain>");
}
protected void doNodes(Element p) {
NodeList nodes = p.getChildNodes();
for (int i=0; i<nodes.getLength(); i++) {
Node n = nodes.item(i);
if (n instanceof CharacterData) {
doCData((CharacterData)n);
p.removeChild(n);
}
}
}
/** Simply subclass PrintWriter so we dont have to modify
* GetMark to change the format of lines that it writes, or
* resort to other kluges like passing it a prefix and/or suffix.
*/
public class StyledWriter extends PrintWriter {
public StyledWriter(PrintWriter p) {
super(p, true);
}
public void println(String s) {
super.println("<CellBody>" + s);
}
}
}
|
