/*
* @(#)$Id$
*
* 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.Enumeration;
import java.util.StringTokenizer;
import org.apache.xalan.xsltc.compiler.util.Type;
import de.fub.bytecode.generic.*;
import org.apache.xalan.xsltc.compiler.util.*;
final class XslElement extends Instruction {
private AttributeValue _name; // name treated as AVT (7.1.3)
private AttributeValueTemplate _namespace = null;
private String _namespacePrefix;
private boolean _ignore = false;
/**
* Displays the contents of the element
*/
public void display(int indent) {
indent(indent);
Util.println("Element " + _name);
displayContents(indent + IndentIncrement);
}
/**
* Parses the element's contents. Special care taken for namespaces.
* TODO: The namespace attribute that specifies the namespace to use
* for the element is an attribute value template and not a string
* constant. This means that we do not know what namespace is used
* before runtime. This causes a problem with the way output namespaces
* are handled at compile-time. We use a shortcut in this method to get
* around the problem by treating the namaspace attribute as a constant.
* (Yes, I know this is a hack, bad, bad, bad.)
*/
public void parseContents(Parser parser) {
final SymbolTable stable = parser.getSymbolTable();
// First try to get namespace from the namespace attribute
String namespace = getAttribute("namespace");
// If that is undefied we use the prefix in the supplied QName
String name = getAttribute("name");
QName qname = parser.getQNameSafe(name);
final String prefix = qname.getPrefix();
if ((namespace == null || namespace == Constants.EMPTYSTRING) &&
(prefix != null)) {
namespace = lookupNamespace(prefix);
if (namespace == null) {
final ErrorMsg msg =
new ErrorMsg(ErrorMsg.NSPUNDEF_ERR, prefix);
parser.reportError(Constants.WARNING, msg);
parseChildren(parser);
_ignore = true; // Ignore the element if prefix is undeclared
return;
}
}
// Check if this element belongs in a specific namespace
if (namespace != Constants.EMPTYSTRING) {
// Get the namespace requested by the xsl:element
_namespace = new AttributeValueTemplate(namespace, parser);
// Get the current prefix for that namespace (if any)
_namespacePrefix = lookupPrefix(namespace);
// Is it the default namespace?
if ((_namespacePrefix = prefix) == null)
_namespacePrefix = Constants.EMPTYSTRING;
// Construct final element QName
if (_namespacePrefix == Constants.EMPTYSTRING)
name = qname.getLocalPart();
else
name = _namespacePrefix+":"+qname.getLocalPart();
}
_name = AttributeValue.create(this, name, parser);
// Next check that the local part of the QName is legal (no whitespace)
if ((_name instanceof SimpleAttributeValue) &&
(qname.getLocalPart().indexOf(' ') > -1)) {
final ErrorMsg msg =
new ErrorMsg("You can't call an element \""+
qname.getLocalPart()+"\"");
parser.reportError(Constants.WARNING, msg);
parseChildren(parser);
_ignore = true; // Ignore the element if the local part is invalid
return;
}
// Handle the 'use-attribute-sets' attribute
final String useSets = getAttribute("use-attribute-sets");
if (useSets.length() > 0) {
setFirstElement(new UseAttributeSets(useSets, parser));
}
parseChildren(parser);
}
/**
* Run type check on element name & contents
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
if (!_ignore) {
_name.typeCheck(stable);
if (_namespace != null)
_namespace.typeCheck(stable);
}
typeCheckContents(stable);
return Type.Void;
}
/**
* Compiles code that emits the element with the necessary namespace
* definitions. The element itself is ignored if the element definition
* was in any way erronous, but the child nodes are still processed.
* See the overriden translateContents() method as well.
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Ignore this element if not correctly declared
if (!_ignore) {
// Compile code that emits the element start tag
il.append(methodGen.loadHandler());
_name.translate(classGen, methodGen);
il.append(DUP2); // duplicate these 2 args for endElement
il.append(methodGen.startElement());
// Compile code that emits any needed namespace declaration
if (_namespace != null) {
// public void attribute(final String name, final String value)
il.append(methodGen.loadHandler());
il.append(new PUSH(cpg,_namespacePrefix));
_namespace.translate(classGen,methodGen);
il.append(methodGen.namespace());
}
}
// Compile code that emits the element attributes and contents
translateContents(classGen, methodGen);
// Ignore this element if not correctly declared
if (!_ignore) {
// Compile code that emits the element end tag
il.append(methodGen.endElement());
}
}
/**
* Override this method to make sure that xsl:attributes are not
* copied to output if this xsl:element is to be ignored
*/
public void translateContents(ClassGenerator classGen,
MethodGenerator methodGen) {
final int n = elementCount();
for (int i = 0; i < n; i++) {
final SyntaxTreeNode item =
(SyntaxTreeNode)getContents().elementAt(i);
if ((_ignore) && (item instanceof XslAttribute)) continue;
item.translate(classGen, methodGen);
}
}
}