/*
* @(#)$Id: Stylesheet.java,v 1.5 2001/05/21 14:46:12 morten Exp $
*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Sun
* Microsystems., http://www.sun.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*
*/
package org.apache.xalan.xsltc.compiler;
import java.util.Vector;
import java.util.Hashtable;
import java.util.Enumeration;
import java.util.StringTokenizer;
import java.net.URL;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;
import org.apache.xalan.xsltc.compiler.util.Type;
import de.fub.bytecode.generic.*;
import de.fub.bytecode.classfile.JavaClass;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
import org.apache.xalan.xsltc.compiler.util.Util;
import org.apache.xalan.xsltc.DOM;
public final class Stylesheet extends SyntaxTreeNode {
private String _version;
private NamedNodeMap _stylesheetAttributes;
private QName _name;
private URL _url;
private Stylesheet _parentStylesheet;
// Contains global variables and parameters defined in the stylesheet
private final Vector _globals = new Vector();
// Used to cache the result returned by <code>hasLocalParams()</code>.
private Boolean _hasLocalParams = null;
// The name of the class being generated.
private String _className;
// Contains all templates dedined in this stylesheet
private final Vector _templates = new Vector();
private int _nextModeSerial = 1;
private final Hashtable _modes = new Hashtable();
private final Hashtable _extensions = new Hashtable();
private int _importPrecedence = 1;
private Mode _defaultMode;
private boolean _multiDocument = false;
// All named key elements (needed by Key/IdPattern)
private Hashtable _keys = new Hashtable();
private boolean _numberFormattingUsed = false;
private boolean _simplified = false;
public boolean isSimplified() {
return(_simplified);
}
public void setSimplified() {
_simplified = true;
}
public void setMultiDocument(boolean flag) {
_multiDocument = flag;
}
public boolean isMultiDOM() {
return _multiDocument;
}
public boolean isImported() {
final SyntaxTreeNode parent = getParent();
return ((parent != null) && (parent instanceof Import));
}
public boolean isIncluded() {
final SyntaxTreeNode parent = getParent();
return ((parent != null) && (parent instanceof Include));
}
public void numberFormattingUsed() {
_numberFormattingUsed = true;
}
public void setImportPrecedence(final int precedence) {
_importPrecedence = precedence;
final Enumeration elements = elements();
while (elements.hasMoreElements()) {
final TopLevelElement child =
(TopLevelElement)elements.nextElement();
if (child instanceof Include) {
Stylesheet included = ((Include)child).getIncludedStylesheet();
if (included != null) {
included.setImportPrecedence(precedence);
}
}
}
}
public int getImportPrecedence() {
return _importPrecedence;
}
public boolean checkForLoop(URL url) {
return _url.sameFile(url) ||
_parentStylesheet != null && _parentStylesheet.checkForLoop(url);
}
public void setParser(Parser parser) {
super.setParser(parser);
_name = makeStylesheetName("%stylesheet%");
}
public void setParentStylesheet(Stylesheet parent) {
_parentStylesheet = parent;
}
public Stylesheet getParentStylesheet() {
return _parentStylesheet;
}
public void setURL(URL url) {
_url = url;
}
public URL getURL() {
return _url;
}
private QName makeStylesheetName(String prefix) {
return getParser().getQName(prefix+getXSLTC().nextStylesheetSerial());
}
/**
* Returns true if this stylesheet has global vars or params.
*/
public boolean hasGlobals() {
return _globals.size() > 0;
}
/**
* Returns true if at least one template in the stylesheet has params
* defined. Uses the variable <code>_hasLocalParams</code> to cache the
* result.
*/
public boolean hasLocalParams() {
if (_hasLocalParams == null) {
final int n = _templates.size();
for (int i = 0; i < n; i++) {
final Template template = (Template)_templates.elementAt(i);
if (template.hasParams()) {
_hasLocalParams = new Boolean(true);
return true;
}
}
_hasLocalParams = new Boolean(false);
return false;
}
else {
return _hasLocalParams.booleanValue();
}
}
/**
* Store extension URIs
*/
private void extensionURI(String prefixes, SymbolTable stable) {
if (prefixes != null) {
StringTokenizer tokens = new StringTokenizer(prefixes);
while (tokens.hasMoreTokens()) {
final String prefix = tokens.nextToken();
final String uri = stable.lookupNamespace(prefix);
if (uri != null) {
_extensions.put(uri, prefix);
}
}
}
}
public boolean isExtension(String uri) {
return (_extensions.get(uri) != null);
}
/**
* Parse the version and uri fields of the stylesheet and add an
* entry to the symbol table mapping the name <tt>%stylesheet%</tt>
* to an instance of this class.
*/
public void parseContents(Element element, Parser parser) {
final SymbolTable stable = parser.getSymbolTable();
// Add namespace declarations to symbol table
parser.pushNamespaces(element);
_version = element.getAttribute("version");
_stylesheetAttributes = element.getAttributes();
final String excludePrefixes =
element.getAttribute("exclude-result-prefixes");
final String extensionPrefixes =
element.getAttribute("extension-element-prefixes");
stable.excludeNamespaces(excludePrefixes);
stable.excludeNamespaces(extensionPrefixes);
extensionURI(extensionPrefixes, stable);
// Report and error if more than one stylesheet defined
final Stylesheet sheet = stable.addStylesheet(_name, this);
if (sheet != null) {
// Error: more that one stylesheet defined
ErrorMsg error = new ErrorMsg(ErrorMsg.STLREDEF_ERR, this);
parser.addError(error);
}
// If this is a simplified stylesheet we must create a template that
// grabs the root node of the input doc ( <xsl:template match="/"/> ).
// This template needs the current element (the one passed to this
// method) as its only child, so the Template class has a special
// method that handles this (parseSimplified()).
if (_simplified) {
stable.excludeURI(XSLT_URI);
Template template = new Template();
addElement(template);
template.setParent(this);
template.parseSimplified(element, parser);
}
// Parse the children of this node
else {
parseOwnChildren(element, parser);
}
// Remove namespaces from symbol table
parser.popNamespaces(element);
}
/**
* Parse all the children of <tt>element</tt>.
* XSLT commands are recognized by the XSLT namespace
*/
public final void parseOwnChildren(Element element, Parser parser) {
final NodeList nl = element.getChildNodes();
final int n = nl != null ? nl.getLength() : 0;
Vector locals = null; // only create when needed
// We have to scan the stylesheet element's top-level elements for
// variables and/or parameters before we parse the other elements...
for (int i = 0; i < n; i++) {
final Node node = nl.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
final Element child = (Element)node;
final String uri = child.getNamespaceURI();
final String tag = child.getLocalName();
if (uri.equals(XSLT_URI)) {
if (tag.equals("param") || tag.equals("variable")) {
parser.pushNamespaces(child);
SyntaxTreeNode instance = parser.makeInstance(child);
addElement(instance);
instance.parseContents(child, parser);
QName varOrParamName = updateScope(parser, instance);
if (varOrParamName != null) {
if (locals == null) {
locals = new Vector(2);
}
locals.addElement(varOrParamName);
}
parser.popNamespaces(child);
}
}
}
}
// Now go through all the other top-level elements...
for (int i = 0; i < n; i++) {
final Node node = nl.item(i);
switch (node.getNodeType()) {
case Node.ELEMENT_NODE:
final Element child = (Element)node;
final String uri = child.getNamespaceURI();
final String tag = child.getLocalName();
// Skip if this is a variable/parameter
if (uri.equals(XSLT_URI)) {
if (tag.equals("param") || tag.equals("variable")) break;
}
// Add namespace declarations to symbol table
parser.pushNamespaces(child);
final SyntaxTreeNode instance = parser.makeInstance(child);
addElement(instance);
if (!(instance instanceof Fallback))
instance.parseContents(child, parser);
// Remove namespace declarations from symbol table
parser.popNamespaces(child);
break;
case Node.TEXT_NODE:
// !!! need to take a look at whitespace stripping
final String temp = node.getNodeValue();
if (temp.trim().length() > 0) {
addElement(new Text(temp));
}
break;
}
}
// after the last element, remove any locals from scope
if (locals != null) {
final int nLocals = locals.size();
for (int i = 0; i < nLocals; i++) {
parser.removeVariable((QName)locals.elementAt(i));
}
}
}
public void processModes() {
if (_defaultMode == null)
_defaultMode = new Mode(null, this, "");
_defaultMode.processPatterns(_keys);
final Enumeration modes = _modes.elements();
while (modes.hasMoreElements()) {
final Mode mode = (Mode)modes.nextElement();
mode.processPatterns(_keys);
}
}
private void compileModes(ClassGenerator classGen) {
_defaultMode.compileApplyTemplates(classGen);
final Enumeration modes = _modes.elements();
while (modes.hasMoreElements()) {
final Mode mode = (Mode)modes.nextElement();
mode.compileApplyTemplates(classGen);
}
}
public Mode getMode(QName modeName) {
if (modeName == null) {
if (_defaultMode == null) {
_defaultMode = new Mode(null, this, "");
}
return _defaultMode;
}
else {
Mode mode = (Mode)_modes.get(modeName);
if (mode == null) {
final String suffix = Integer.toString(_nextModeSerial++);
_modes.put(modeName, mode = new Mode(modeName, this, suffix));
}
return mode;
}
}
/**
* Type check all the children of this node.
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
return typeCheckContents(stable);
}
/**
* Translate the stylesheet into JVM bytecodes.
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
translate();
}
private void addDOMField(ClassGenerator classGen) {
final FieldGen fgen =
new FieldGen(ACC_PUBLIC,
Util.getJCRefType(classGen.getDOMClassSig()),
DOM_FIELD,
classGen.getConstantPool());
classGen.addField(fgen.getField());
}
/**
* Translate the stylesheet into JVM bytecodes.
*/
public void translate() {
Output lastOutputElement = null;
_className = getXSLTC().getClassName();
// Define a new class by extending TRANSLET_CLASS
final ClassGenerator classGen =
new ClassGenerator(_className,
TRANSLET_CLASS,
//getXSLTC().getFileName(),
"",
ACC_PUBLIC | ACC_SUPER,
null, this);
addDOMField(classGen);
// Compile a default constructor to init the namesIndex table
//compileConstructor(classGen);
// Compile transform() to initialize parameters, globals & output
// and run the transformation
compileTransform(classGen);
// Translate all non-template elements and filter out all templates
final Enumeration elements = elements();
while (elements.hasMoreElements()) {
Object element = elements.nextElement();
// xsl:template
if (element instanceof Template) {
_templates.addElement(element);
// Separate templates by modes
final Template template = (Template)element;
getMode(template.getModeName()).addTemplate(template);
}
// xsl:attribute-set
else if (element instanceof AttributeSet) {
((AttributeSet)element).translate(classGen, null);
}
else if (element instanceof Output) {
// save the element for later to pass to compileConstructor
lastOutputElement = (Output)element;
}
else {
// Global variables and parameters are handled elsewhere.
// Other top-level non-template elements are ignored. Literal
// elements outside of templates will never be output.
}
}
processModes();
compileModes(classGen);
compileConstructor(classGen, lastOutputElement);
getXSLTC().dumpClass(classGen.getJavaClass());
}
private void compileConstructor(ClassGenerator classGen, Output output) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = new InstructionList();
il.append(classGen.loadTranslet());
il.append(new INVOKESPECIAL(cpg.addMethodref(TRANSLET_CLASS,
"<init>", "()V")));
final Vector names = getXSLTC().getNamesIndex();
il.append(classGen.loadTranslet());
il.append(new PUSH(cpg, names.size()));
il.append(new ANEWARRAY(cpg.addClass(STRING)));
for (int i = 0; i < names.size(); i++) {
final String name = (String)names.elementAt(i);
il.append(DUP);
il.append(new PUSH(cpg, i));
il.append(new PUSH(cpg, name));
il.append(AASTORE);
}
il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS,
NAMES_INDEX,
NAMES_INDEX_SIG)));
final Vector namespaces = getXSLTC().getNamespaceIndex();
il.append(classGen.loadTranslet());
il.append(new PUSH(cpg, namespaces.size()));
il.append(new ANEWARRAY(cpg.addClass(STRING)));
for (int i = 0; i < namespaces.size(); i++) {
final String ns = (String)namespaces.elementAt(i);
il.append(DUP);
il.append(new PUSH(cpg, i));
il.append(new PUSH(cpg, ns));
il.append(AASTORE);
}
il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS,
NAMESPACE_INDEX,
NAMESPACE_INDEX_SIG)));
// Introduces bytecodes to set encoding from <xsl:output> if exists.
if (output != null) {
output.translateEncoding(classGen, il);
}
final MethodGenerator constructor =
new MethodGenerator(ACC_PUBLIC,
de.fub.bytecode.generic.Type.VOID,
null, null, "<init>",
_className, il, cpg);
// Compile default decimal formatting symbols.
// This is an implicit, nameless xsl:decimal-format top-level element.
if (_numberFormattingUsed)
DecimalFormatting.translateDefaultDFS(classGen, constructor);
il.append(RETURN);
constructor.stripAttributes(true);
constructor.setMaxLocals();
constructor.setMaxStack();
classGen.addMethod(constructor.getMethod());
}
/**
* Compile a topLevel() method into the output class. This method is
* called from transform() to handle all non-template top-level elemtents.
* Returns the signature of the topLevel() method.
*/
private String compileTopLevel(ClassGenerator classGen,
Enumeration elements) {
final ConstantPoolGen cpg = classGen.getConstantPool();
// The signature of this method depends on the type of DOM we're using
final de.fub.bytecode.generic.Type[] argTypes = {
Util.getJCRefType(classGen.getDOMClassSig()),
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,
de.fub.bytecode.generic.Type.VOID,
argTypes, argNames,
"topLevel", _className, il,
classGen.getConstantPool());
toplevel.addException("org.apache.xalan.xsltc.TransletException");
// Define and initialize 'current' variable with the root node
final LocalVariableGen current =
toplevel.addLocalVariable("current",
de.fub.bytecode.generic.Type.INT,
il.getEnd(), null);
final int setFilter = cpg.addMethodref(classGen.getDOMClass(),
"setFilter",
"(Lorg/apache/xalan/xsltc/dom/StripWhitespaceFilter;)V");
il.append(new PUSH(cpg, DOM.ROOTNODE));
il.append(new ISTORE(current.getIndex()));
// Initialize global variables and parameterns
final int m = _globals.size();
for (int i = 0; i < m; i++) {
TopLevelElement elem = (TopLevelElement)_globals.elementAt(i);
elem.translate(classGen, toplevel);
}
Vector whitespaceRules = new Vector();
// Compile code for other top-level elements
while (elements.hasMoreElements()) {
final Object element = elements.nextElement();
// xsl:output
if (element instanceof Output) {
((Output)element).translate(classGen, toplevel);
}
// xsl:key
/*
else if (element instanceof Key) {
final Key key = (Key)element;
key.translate(classGen, toplevel);
_keys.put(key.getName(),key);
}
*/
// xsl:decimal-format
else if (element instanceof DecimalFormatting) {
((DecimalFormatting)element).translate(classGen,toplevel);
}
// xsl:strip/preserve-space
else if (element instanceof Whitespace) {
whitespaceRules.addAll(((Whitespace)element).getRules());
}
// xsl:param
else if (element instanceof Param) {
((Param)element).translate(classGen,toplevel);
}
// xsl:variable
else if (element instanceof Variable) {
((Variable)element).translate(classGen,toplevel);
}
}
if (whitespaceRules.size() > 0) {
Whitespace.translateRules(whitespaceRules,classGen);
}
if (classGen.containsMethod("stripSpace",
"(Lorg/apache/xalan/xsltc/DOM;II)Z") != null) {
il.append(toplevel.loadDOM());
il.append(new ALOAD(0));
il.append(new INVOKEVIRTUAL(setFilter));
}
il.append(RETURN);
// Compute max locals + stack and add method to class
toplevel.stripAttributes(true);
toplevel.setMaxLocals();
toplevel.setMaxStack();
toplevel.removeNOPs();
classGen.addMethod(toplevel.getMethod());
return("("+ classGen.getDOMClassSig()+
NODE_ITERATOR_SIG + TRANSLET_OUTPUT_SIG + ")V");
}
/**
* Compile a buildKeys() method into the output class. This method is
* called from transform() to handle build all indexes needed by key().
*/
private String compileBuildKeys(ClassGenerator classGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
// The signature of this method depends on the type of DOM we're using
final de.fub.bytecode.generic.Type[] argTypes = {
Util.getJCRefType(DOM_INTF_SIG),
Util.getJCRefType(NODE_ITERATOR_SIG),
Util.getJCRefType(TRANSLET_OUTPUT_SIG),
de.fub.bytecode.generic.Type.INT
};
final String[] argNames = {
DOCUMENT_PNAME, ITERATOR_PNAME, TRANSLET_OUTPUT_PNAME, "current"
};
final InstructionList il = new InstructionList();
final MethodGenerator buildKeys =
new MethodGenerator(ACC_PUBLIC,
de.fub.bytecode.generic.Type.VOID,
argTypes, argNames,
"buildKeys", _className, il,
classGen.getConstantPool());
final int domField = cpg.addFieldref(getClassName(),
DOM_FIELD,
classGen.getDOMClassSig());
buildKeys.addException("org.apache.xalan.xsltc.TransletException");
il.append(classGen.loadTranslet());
il.append(new GETFIELD(domField)); // The DOM reference
il.append(new ASTORE(1));
final Enumeration elements = elements();
// Compile code for other top-level elements
while (elements.hasMoreElements()) {
// xsl:key
final Object element = elements.nextElement();
if (element instanceof Key) {
final Key key = (Key)element;
key.translate(classGen, buildKeys);
_keys.put(key.getName(),key);
}
}
il.append(RETURN);
// Compute max locals + stack and add method to class
buildKeys.stripAttributes(true);
buildKeys.setMaxLocals();
buildKeys.setMaxStack();
buildKeys.removeNOPs();
classGen.addMethod(buildKeys.getMethod());
return("("+DOM_INTF_SIG+NODE_ITERATOR_SIG+TRANSLET_OUTPUT_SIG+"I)V");
}
/**
* Compile transform() into the output class. This method is used to
* initialize global variables and global parameters. The current node
* is set to be the document's root node.
*/
private void compileTransform(ClassGenerator classGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
/*
* Define the the method transform with the following signature:
* void transform(DOM, NodeIterator, HandlerBase)
*/
final de.fub.bytecode.generic.Type[] argTypes =
new de.fub.bytecode.generic.Type[3];
argTypes[0] = Util.getJCRefType(DOM_INTF_SIG);
argTypes[1] = Util.getJCRefType(NODE_ITERATOR_SIG);
argTypes[2] = Util.getJCRefType(TRANSLET_OUTPUT_SIG);
final String[] argNames = new String[3];
argNames[0] = DOCUMENT_PNAME;
argNames[1] = ITERATOR_PNAME;
argNames[2] = TRANSLET_OUTPUT_PNAME;
final InstructionList il = new InstructionList();
final MethodGenerator transf =
new MethodGenerator(ACC_PUBLIC,
de.fub.bytecode.generic.Type.VOID,
argTypes, argNames,
"transform",
_className,
il,
classGen.getConstantPool());
transf.addException("org.apache.xalan.xsltc.TransletException");
// Define and initialize current with the root node
final LocalVariableGen current =
transf.addLocalVariable("current",
de.fub.bytecode.generic.Type.INT,
il.getEnd(), null);
final String applyTemplatesSig = classGen.getApplyTemplatesSig();
final int applyTemplates = cpg.addMethodref(getClassName(),
"applyTemplates",
applyTemplatesSig);
final int domField = cpg.addFieldref(getClassName(),
DOM_FIELD,
classGen.getDOMClassSig());
// push translet for PUTFIELD
il.append(classGen.loadTranslet());
// prepare appropriate DOM implementation
if (isMultiDOM()) {
il.append(new NEW(cpg.addClass(MULTI_DOM_CLASS)));
il.append(DUP);
}
il.append(classGen.loadTranslet());
il.append(transf.loadDOM());
il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS,
"makeDOMAdapter",
"("
+ DOM_INTF_SIG
+ ")"
+ DOM_ADAPTER_SIG)));
// DOMAdapter is on the stack
if (isMultiDOM()) {
final int init = cpg.addMethodref(MULTI_DOM_CLASS,
"<init>",
"(" + DOM_ADAPTER_SIG + ")V");
il.append(new INVOKESPECIAL(init));
// MultiDOM is on the stack
}
//store to _dom variable
il.append(new PUTFIELD(domField));
// continue with globals initialization
il.append(new PUSH(cpg, DOM.ROOTNODE));
il.append(new ISTORE(current.getIndex()));
// Look for top-level elements that need handling
final Enumeration toplevel = elements();
if ((_globals.size() > 0) || (toplevel.hasMoreElements())) {
// Compile method for handling top-level elements
final String topLevelSig = compileTopLevel(classGen, toplevel);
// Get a reference to that method
final int topLevelIdx = cpg.addMethodref(getClassName(),
"topLevel",
topLevelSig);
// Push all parameters on the stack and call topLevel()
il.append(classGen.loadTranslet()); // The 'this' pointer
il.append(classGen.loadTranslet());
il.append(new GETFIELD(domField)); // The DOM reference
il.append(transf.loadIterator());
il.append(transf.loadHandler()); // The output handler
il.append(new INVOKEVIRTUAL(topLevelIdx));
}
final String keySig = compileBuildKeys(classGen);
final int keyIdx = cpg.addMethodref(getClassName(),
"buildKeys", keySig);
il.append(classGen.loadTranslet()); // The 'this' pointer
il.append(classGen.loadTranslet());
il.append(new GETFIELD(domField)); // The DOM reference
il.append(transf.loadIterator()); // Not really used, but...
il.append(transf.loadHandler()); // The output handler
il.append(new PUSH(cpg, DOM.ROOTNODE)); // Start with the root node
il.append(new INVOKEVIRTUAL(keyIdx));
// start document
il.append(transf.loadHandler());
il.append(transf.startDocument());
// push first arg for applyTemplates
il.append(classGen.loadTranslet());
// push translet for GETFIELD to get DOM arg
il.append(classGen.loadTranslet());
il.append(new GETFIELD(domField));
// push remaining 2 args
il.append(transf.loadIterator());
il.append(transf.loadHandler());
il.append(new INVOKEVIRTUAL(applyTemplates));
// endDocument
il.append(transf.loadHandler());
il.append(transf.endDocument());
il.append(RETURN);
// Compute max locals + stack and add method to class
transf.stripAttributes(true);
transf.setMaxLocals();
transf.setMaxStack();
transf.removeNOPs();
classGen.addMethod(transf.getMethod());
}
/**
* Peephole optimization: Remove sequences of [ALOAD, POP].
*/
private void peepHoleOptimization(MethodGenerator methodGen) {
final String pat = "`ALOAD'`POP'`Instruction'";
final InstructionList il = methodGen.getInstructionList();
final FindPattern find = new FindPattern(il);
InstructionHandle ih = find.search(pat);
while (ih != null) {
InstructionHandle[] match = find.getMatch();
try {
il.delete(match[0], match[1]);
}
catch (TargetLostException e) {
// TODO: move target down into the list
}
ih = find.search(pat, match[2]);
}
}
public int addParam(Param param) {
_globals.addElement(param);
return _globals.size() - 1;
}
public int addVariable(Variable global) {
_globals.addElement(global);
return _globals.size() - 1;
}
// overridden from SyntaxTreeNode
protected final QName updateScope(Parser parser, SyntaxTreeNode node) {
return null;
}
public void display(int indent) {
indent(indent);
Util.println("Stylesheet");
displayContents(indent + IndentIncrement);
}
public String getNamespace(String prefix) {
/* WRONG - WRONG - WRONG - namespace delcarations are not passed
as attributes.
final Node attr = _stylesheetAttributes.getNamedItem("xmlns:" + prefix);
return attr != null ? attr.getNodeValue() : null;
*/
return getParser().getSymbolTable().lookupNamespace(prefix);
}
public String getClassName() {
return _className;
}
public Vector getTemplates() {
return _templates;
}
}