| /* |
| * @(#)$Id$ |
| * |
| * 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 org.apache.bcel.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 _prefix; |
| private boolean _ignore = false; |
| |
| /** |
| * Displays the contents of the element |
| */ |
| public void display(int indent) { |
| indent(indent); |
| Util.println("Element " + _name); |
| displayContents(indent + IndentIncrement); |
| } |
| |
| public boolean declaresDefaultNS() { |
| return (_namespace != null && _prefix == EMPTYSTRING); |
| } |
| |
| /** |
| * 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(); |
| |
| // Get the "name" attribute of the <xsl:element> element |
| String name = getAttribute("name"); |
| if ((name == null) || (name.equals(EMPTYSTRING))) { |
| ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ELEM_NAME_ERR, |
| name, this); |
| parser.reportError(WARNING, msg); |
| _ignore = true; // Ignore the element if the QName is invalid |
| return; |
| } |
| |
| // Try to construct a QName and then get the prefix and local part |
| QName qname = parser.getQNameSafe(name); |
| String prefix = qname.getPrefix(); |
| String local = qname.getLocalPart(); |
| |
| // First try to get the namespace URI from the "namespace" attribute |
| String namespace = getAttribute("namespace"); |
| // Then try to get it from the "name" attribute QName prefix |
| if (!hasAttribute("namespace")) { |
| // We are supposed to use the default namespace URI if the QName |
| // from the "name" attribute is not prefixed, so check that first |
| if (prefix == null) prefix = EMPTYSTRING; |
| // Then look up the URI that is in scope for the prefix |
| namespace = lookupNamespace(prefix); |
| |
| // Signal error if the prefix does not map to any namespace URI |
| if (namespace == null) { |
| ErrorMsg err = new ErrorMsg(ErrorMsg.NAMESPACE_UNDEF_ERR, |
| prefix, this); |
| parser.reportError(WARNING, err); |
| parseChildren(parser); |
| _ignore = true; // Ignore the element if prefix is undeclared |
| return; |
| } |
| _namespace = new AttributeValueTemplate(namespace, parser); |
| _prefix = prefix; |
| } |
| // Check if this element belongs in a specific namespace |
| else { |
| // Get the namespace requested by the xsl:element |
| _namespace = new AttributeValueTemplate(namespace, parser); |
| // Get the current prefix for that namespace (if any) |
| _prefix = lookupPrefix(namespace); |
| // Is it the default namespace? |
| if ((_prefix = prefix) == null) _prefix = EMPTYSTRING; |
| |
| // Construct final element QName |
| if (_prefix == EMPTYSTRING) |
| name = qname.getLocalPart(); |
| else |
| name = _prefix+":"+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) { |
| if (local.equals(EMPTYSTRING) || (local.indexOf(' ') > -1)) { |
| ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ELEM_NAME_ERR, |
| local, this); |
| parser.reportError(WARNING, err); |
| parseChildren(parser); |
| _ignore = true; // Ignore the element if 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, _prefix)); |
| _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); |
| } |
| } |
| |
| } |