/**
*
*/
package org.richfaces.renderkit;
import java.io.IOException;
import java.io.StringReader;
import java.io.Writer;
import java.util.Iterator;
import java.util.List;
import org.richfaces.javacc.RichMacroDefinition;
import org.richfaces.json.JSContentHandler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* @author Nick Belaevski - mailto:nbelaevski@exadel.com created 21.06.2007
*
*/
public class MacroDefinitionJSContentHandler extends JSContentHandler {
private String prolog;
private String epilog;
public MacroDefinitionJSContentHandler(Writer writer, String prolog,
String epilog) {
super(writer);
this.prolog = prolog;
this.epilog = epilog;
}
private List parseExpressiion(String expressionString) throws SAXException {
try {
List result = new RichMacroDefinition(new StringReader(expressionString)).expression();
return result;
} catch (Exception e) {
throw new SAXException(e.getMessage(), e);
}
}
private void encodeExpressionString(String string) throws IOException,
SAXException {
List parsedExpressiion = parseExpressiion(string);
boolean isExpression = false;
for (Iterator iterator = parsedExpressiion.iterator(); iterator
.hasNext();) {
Object next = (Object) iterator.next();
if (next instanceof Expression) {
isExpression = true;
break;
}
}
if (isExpression) {
this.outputWriter.write("function (context) { return ");
}
boolean first = true;
for (Iterator iterator = parsedExpressiion.iterator(); iterator
.hasNext();) {
Object next = (Object) iterator.next();
if (next == null) {
continue;
}
if (!first) {
this.outputWriter.write('+');
}
if (next instanceof Expression) {
Expression macroExpression = (Expression) next;
this.outputWriter.write(prolog);
this.encode(macroExpression.getExpression().toString());
this.outputWriter.write(epilog);
} else {
this.outputWriter.write('\'');
this.encode(next.toString());
this.outputWriter.write('\'');
}
first = false;
}
if (isExpression) {
this.outputWriter.write(";}");
}
}
protected void encodeAttributeValue(Attributes attributes, int idx)
throws SAXException, IOException {
String value = attributes.getValue(idx);
encodeExpressionString(value);
}
public void characters(char[] ch, int start, int length)
throws SAXException {
if (isProcessingCdata()) {
super.characters(ch, start, length);
} else {
List parsedExpression = parseExpressiion(new String(ch, start, length));
for (Iterator iterator = parsedExpression.iterator(); iterator
.hasNext();) {
Object next = iterator.next();
if (next instanceof Expression) {
Expression expression = (Expression) next;
if (this.isBeforeDocumentStart() || level < 0)
return;
try {
if (level != 0 && !this.closeElement(false) && this.isProcessingCdata() == false) {
this.outputWriter.write(',');
}
if (this.isProcessingCdata() == false) {
this.outputWriter.write("new ET(");
}
this.outputWriter.write("function (context) { return ");
this.outputWriter.write(prolog);
this.encode(expression.getExpression().toString());
this.outputWriter.write(epilog);
this.outputWriter.write("}");
if (this.isProcessingCdata() == false) {
this.outputWriter.write(")");
}
} catch (IOException e) {
throw new SAXException("Write error",e);
}
} else {
char[] cs = next.toString().toCharArray();
super.characters(cs, 0, cs.length);
}
if (iterator.hasNext()) {
try {
this.outputWriter.write(',');
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
protected void encodeText(char[] chars, int start, int length)
throws SAXException, IOException {
if (!isProcessingCdata()) {
String str = new String(chars, start, length);
encodeExpressionString(str);
} else {
super.encodeText(chars, start, length);
}
}
}