/**
* Compile a topLevel() method into the output class. This method is called from transform() to
* handle all non-template top-level elements. Returns the signature of the topLevel() method.
*
* <p>Global variables/params and keys are first sorted to resolve dependencies between them. The
* XSLT 1.0 spec does not allow a key to depend on a variable. However, for compatibility with
* Xalan interpretive, that type of dependency is allowed. Note also that the buildKeys() method
* is still generated as it is used by the LoadDocument class, but it no longer called from
* transform().
*/
private String compileTopLevel(ClassGenerator classGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final com.sun.org.apache.bcel.internal.generic.Type[] argTypes = {
Util.getJCRefType(DOM_INTF_SIG),
Util.getJCRefType(NODE_ITERATOR_SIG),
Util.getJCRefType(TRANSLET_OUTPUT_SIG)
};
final String[] argNames = {DOCUMENT_PNAME, ITERATOR_PNAME, TRANSLET_OUTPUT_PNAME};
final InstructionList il = new InstructionList();
final MethodGenerator toplevel =
new MethodGenerator(
ACC_PUBLIC,
com.sun.org.apache.bcel.internal.generic.Type.VOID,
argTypes,
argNames,
"topLevel",
_className,
il,
classGen.getConstantPool());
toplevel.addException("com.sun.org.apache.xalan.internal.xsltc.TransletException");
// Define and initialize 'current' variable with the root node
final LocalVariableGen current =
toplevel.addLocalVariable(
"current", com.sun.org.apache.bcel.internal.generic.Type.INT, null, null);
final int setFilter =
cpg.addInterfaceMethodref(
DOM_INTF, "setFilter", "(Lcom/sun/org/apache/xalan/internal/xsltc/StripFilter;)V");
final int gitr = cpg.addInterfaceMethodref(DOM_INTF, "getIterator", "()" + NODE_ITERATOR_SIG);
il.append(toplevel.loadDOM());
il.append(new INVOKEINTERFACE(gitr, 1));
il.append(toplevel.nextNode());
current.setStart(il.append(new ISTORE(current.getIndex())));
// Create a new list containing variables/params + keys
Vector varDepElements = new Vector(_globals);
Enumeration elements = elements();
while (elements.hasMoreElements()) {
final Object element = elements.nextElement();
if (element instanceof Key) {
varDepElements.add(element);
}
}
// Determine a partial order for the variables/params and keys
varDepElements = resolveDependencies(varDepElements);
// Translate vars/params and keys in the right order
final int count = varDepElements.size();
for (int i = 0; i < count; i++) {
final TopLevelElement tle = (TopLevelElement) varDepElements.elementAt(i);
tle.translate(classGen, toplevel);
if (tle instanceof Key) {
final Key key = (Key) tle;
_keys.put(key.getName(), key);
}
}
// Compile code for other top-level elements
Vector whitespaceRules = new Vector();
elements = elements();
while (elements.hasMoreElements()) {
final Object element = elements.nextElement();
// xsl:decimal-format
if (element instanceof DecimalFormatting) {
((DecimalFormatting) element).translate(classGen, toplevel);
}
// xsl:strip/preserve-space
else if (element instanceof Whitespace) {
whitespaceRules.addAll(((Whitespace) element).getRules());
}
}
// Translate all whitespace strip/preserve rules
if (whitespaceRules.size() > 0) {
Whitespace.translateRules(whitespaceRules, classGen);
}
if (classGen.containsMethod(STRIP_SPACE, STRIP_SPACE_PARAMS) != null) {
il.append(toplevel.loadDOM());
il.append(classGen.loadTranslet());
il.append(new INVOKEINTERFACE(setFilter, 2));
}
il.append(RETURN);
// Compute max locals + stack and add method to class
classGen.addMethod(toplevel);
return ("(" + DOM_INTF_SIG + NODE_ITERATOR_SIG + TRANSLET_OUTPUT_SIG + ")V");
}
