| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.sun.org.apache.xalan.internal.xsltc.compiler; |
| |
| import com.sun.org.apache.bcel.internal.generic.ALOAD; |
| import com.sun.org.apache.bcel.internal.generic.ASTORE; |
| import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; |
| import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC; |
| import com.sun.org.apache.bcel.internal.generic.InstructionList; |
| import com.sun.org.apache.bcel.internal.generic.LocalVariableGen; |
| import com.sun.org.apache.bcel.internal.generic.PUSH; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util; |
| import com.sun.org.apache.xml.internal.utils.XML11Char; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| */ |
| final class XslElement extends Instruction { |
| |
| private String _prefix; |
| private boolean _ignore = false; |
| private boolean _isLiteralName = true; |
| private AttributeValueTemplate _name; |
| private AttributeValueTemplate _namespace; |
| |
| /** |
| * Displays the contents of the element |
| */ |
| public void display(int indent) { |
| indent(indent); |
| Util.println("Element " + _name); |
| displayContents(indent + IndentIncrement); |
| } |
| |
| public void parseContents(Parser parser) { |
| final SymbolTable stable = parser.getSymbolTable(); |
| |
| // Handle the 'name' attribute |
| String name = getAttribute("name"); |
| if (name == EMPTYSTRING) { |
| ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ELEM_NAME_ERR, |
| name, this); |
| parser.reportError(WARNING, msg); |
| parseChildren(parser); |
| _ignore = true; // Ignore the element if the QName is invalid |
| return; |
| } |
| |
| // Get namespace attribute |
| String namespace = getAttribute("namespace"); |
| |
| // Optimize compilation when name is known at compile time |
| _isLiteralName = Util.isLiteral(name); |
| if (_isLiteralName) { |
| if (!XML11Char.isXML11ValidQName(name)) { |
| ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ELEM_NAME_ERR, |
| name, this); |
| parser.reportError(WARNING, msg); |
| parseChildren(parser); |
| _ignore = true; // Ignore the element if the QName is invalid |
| return; |
| } |
| |
| final QName qname = parser.getQNameSafe(name); |
| String prefix = qname.getPrefix(); |
| String local = qname.getLocalPart(); |
| |
| if (prefix == null) { |
| prefix = EMPTYSTRING; |
| } |
| |
| if (!hasAttribute("namespace")) { |
| namespace = lookupNamespace(prefix); |
| 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; |
| } |
| _prefix = prefix; |
| _namespace = new AttributeValueTemplate(namespace, parser, this); |
| } |
| else { |
| if (prefix == EMPTYSTRING) { |
| if (Util.isLiteral(namespace)) { |
| prefix = lookupPrefix(namespace); |
| if (prefix == null) { |
| prefix = stable.generateNamespacePrefix(); |
| } |
| } |
| |
| // Prepend prefix to local name |
| final StringBuffer newName = new StringBuffer(prefix); |
| if (prefix != EMPTYSTRING) { |
| newName.append(':'); |
| } |
| name = newName.append(local).toString(); |
| } |
| _prefix = prefix; |
| _namespace = new AttributeValueTemplate(namespace, parser, this); |
| } |
| } |
| else { |
| _namespace = (namespace == EMPTYSTRING) ? null : |
| new AttributeValueTemplate(namespace, parser, this); |
| } |
| |
| _name = new AttributeValueTemplate(name, parser, this); |
| |
| final String useSets = getAttribute("use-attribute-sets"); |
| if (useSets.length() > 0) { |
| if (!Util.isValidQNames(useSets)) { |
| ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, useSets, this); |
| parser.reportError(Constants.ERROR, err); |
| } |
| 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; |
| } |
| |
| /** |
| * This method is called when the name of the element is known at compile time. |
| * In this case, there is no need to inspect the element name at runtime to |
| * determine if a prefix exists, needs to be generated, etc. |
| */ |
| public void translateLiteral(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| if (!_ignore) { |
| il.append(methodGen.loadHandler()); |
| _name.translate(classGen, methodGen); |
| il.append(DUP2); |
| il.append(methodGen.startElement()); |
| |
| if (_namespace != null) { |
| il.append(methodGen.loadHandler()); |
| il.append(new PUSH(cpg, _prefix)); |
| _namespace.translate(classGen,methodGen); |
| il.append(methodGen.namespace()); |
| } |
| } |
| |
| translateContents(classGen, methodGen); |
| |
| if (!_ignore) { |
| il.append(methodGen.endElement()); |
| } |
| } |
| |
| /** |
| * At runtime the compilation of xsl:element results in code that: (i) |
| * evaluates the avt for the name, (ii) checks for a prefix in the name |
| * (iii) generates a new prefix and create a new qname when necessary |
| * (iv) calls startElement() on the handler (v) looks up a uri in the XML |
| * when the prefix is not known at compile time (vi) calls namespace() |
| * on the handler (vii) evaluates the contents (viii) calls endElement(). |
| */ |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| // Optimize translation if element name is a literal |
| if (_isLiteralName) { |
| translateLiteral(classGen, methodGen); |
| return; |
| } |
| |
| if (!_ignore) { |
| |
| // if the qname is an AVT, then the qname has to be checked at runtime if it is a valid qname |
| LocalVariableGen nameValue = |
| methodGen.addLocalVariable2("nameValue", |
| Util.getJCRefType(STRING_SIG), |
| null); |
| |
| // store the name into a variable first so _name.translate only needs to be called once |
| _name.translate(classGen, methodGen); |
| nameValue.setStart(il.append(new ASTORE(nameValue.getIndex()))); |
| il.append(new ALOAD(nameValue.getIndex())); |
| |
| // call checkQName if the name is an AVT |
| final int check = cpg.addMethodref(BASIS_LIBRARY_CLASS, "checkQName", |
| "(" |
| +STRING_SIG |
| +")V"); |
| il.append(new INVOKESTATIC(check)); |
| |
| // Push handler for call to endElement() |
| il.append(methodGen.loadHandler()); |
| |
| // load name value again |
| nameValue.setEnd(il.append(new ALOAD(nameValue.getIndex()))); |
| |
| if (_namespace != null) { |
| _namespace.translate(classGen, methodGen); |
| } |
| else { |
| il.append(ACONST_NULL); |
| } |
| |
| // Push additional arguments |
| il.append(methodGen.loadHandler()); |
| il.append(methodGen.loadDOM()); |
| il.append(methodGen.loadCurrentNode()); |
| |
| // Invoke BasisLibrary.startXslElemCheckQName() |
| il.append(new INVOKESTATIC( |
| cpg.addMethodref(BASIS_LIBRARY_CLASS, "startXslElement", |
| "(" + STRING_SIG |
| + STRING_SIG |
| + TRANSLET_OUTPUT_SIG |
| + DOM_INTF_SIG + "I)" + STRING_SIG))); |
| |
| |
| } |
| |
| translateContents(classGen, methodGen); |
| |
| if (!_ignore) { |
| 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 = getContents().get(i); |
| if (_ignore && item instanceof XslAttribute) continue; |
| item.translate(classGen, methodGen); |
| } |
| } |
| |
| } |
